CN115407246B - Detection circuit and power supply device for actual contact resistance of connector - Google Patents
Detection circuit and power supply device for actual contact resistance of connector Download PDFInfo
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- CN115407246B CN115407246B CN202211109434.6A CN202211109434A CN115407246B CN 115407246 B CN115407246 B CN 115407246B CN 202211109434 A CN202211109434 A CN 202211109434A CN 115407246 B CN115407246 B CN 115407246B
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- 238000001514 detection method Methods 0.000 title claims abstract description 185
- 239000003990 capacitor Substances 0.000 claims description 49
- 238000004804 winding Methods 0.000 claims description 32
- 238000012545 processing Methods 0.000 claims description 31
- 238000001914 filtration Methods 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 14
- 230000002159 abnormal effect Effects 0.000 description 10
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- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical group Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 5
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- 230000005684 electric field Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a detection circuit and a power supply device of an actual contact resistance of a connector, wherein the detection circuit comprises a detection resistor, a mutual inductor, a current detection circuit, a voltage detection circuit and a singlechip; one end of the detection resistor is electrically connected with the positive electrode input end of the connector, and the second end of the detection resistor is electrically connected with the positive electrode output end of the connector; the mutual inductor is used for acquiring an induced current signal according to the current signal flowing through the detection resistor and outputting the induced current signal to the current detection circuit; the current detection circuit is used for outputting a first detection signal to the singlechip according to the induced current signal; the voltage detection circuit is used for acquiring an output voltage signal of the connector and outputting a second detection signal to the singlechip according to the output voltage signal; the singlechip is used for determining the actual contact resistance of the connector according to the first detection signal and the second detection signal, and can accurately determine the contact condition of the connector according to the detection result, so that the dangerous condition caused by excessive heat generated by poor contact of the connector is avoided.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a detection circuit of actual contact resistance of a connector and a power supply device.
Background
Nowadays, high-power household appliances are becoming more and more popular, and most household appliances such as steaming ovens are usually connected to a power supply through an electric control board, and a connector is used to connect a power line of the steaming oven to the electric control board, or to connect the electric control board to the power supply.
The connector can be an inserting sheet or a special socket and the like, when the connector is used for connecting a load, an electric control board and power supply, the connection condition of the connector cannot be detected generally, if the connection terminals of the connector are in poor contact, the connection of the connector is abnormal, the terminals are heated, the working performance of the electric control board is affected, the electric control board is burnt out when the connector is overheated, even fire is caused, and unnecessary economic loss and danger are caused.
In the prior art, a wire pressing scheme is generally adopted to replace a connector, namely, a wire harness is pressed by a screw to realize reliable connection between wires, but the wire pressing scheme needs to be installed by means of a tool, is large in size and occupied space, is inconvenient to operate, low in efficiency, relatively high in cost and not suitable for wide use.
Disclosure of Invention
The invention provides a detection circuit of actual contact resistance of a connector and a power supply device, which aim to solve the problem that the contact condition of the connector can be detected in real time.
According to an aspect of the present invention, there is provided a detection circuit of actual contact resistance of a connector electrically connected between an electric control board and a power supply source and/or between a load and the electric control board, comprising: the device comprises a detection resistor, a transformer, a current detection circuit, a voltage detection circuit and a singlechip;
one end of the detection resistor is electrically connected with the positive electrode input end of the connector, and the second end of the detection resistor is electrically connected with the positive electrode output end of the connector;
The transformer comprises a primary side winding and a secondary side winding; the first end of the primary side winding is suspended, and the second end of the primary side winding is grounded; the secondary side winding is electrically connected with the input end of the current detection circuit; a connecting wire between the second end of the detection resistor and the positive output end of the connector penetrates through the coil of the transformer; the mutual inductor is used for acquiring an induced current signal according to a current signal flowing through the detection resistor and outputting the induced current signal to the current detection circuit;
the output end of the current detection circuit is electrically connected with the singlechip; the current detection circuit is used for outputting a first detection signal to the singlechip according to the induced current signal;
The voltage detection circuit is electrically connected with the output end of the connector and the singlechip respectively; the voltage detection circuit is used for acquiring an output voltage signal of the connector and outputting a second detection signal to the singlechip according to the output voltage signal;
The singlechip is used for determining the actual contact resistance of the connector according to the first detection signal and the second detection signal.
Optionally, the current detection circuit includes a signal conversion unit and a signal processing unit;
the signal conversion unit is respectively and electrically connected with the secondary side winding and the signal processing unit and is used for converting a received induced current signal into an induced voltage signal;
the signal processing unit is also electrically connected with the singlechip; the signal processing unit is used for outputting a first detection signal to the singlechip according to the induced voltage signal.
Optionally, the signal conversion unit includes a first resistor R1, a second resistor VR1, and a first capacitor;
A first end of the first resistor is electrically connected with a first end of the secondary side winding, and a second end of the first resistor is electrically connected with a first end of the second resistor;
the first end of the first capacitor is electrically connected with the second end of the second resistor and the first input end of the signal processing unit, and the second end of the first capacitor is electrically connected with the second end of the secondary side winding and the second input end of the signal processing unit.
Optionally, the signal processing unit includes a dual operational amplifier, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
the first inverting input end of the double operational amplifier is electrically connected with the first output end of the signal conversion unit through the third resistor, and the first inverting input end of the double operational amplifier is also electrically connected with the first output end of the double operational amplifier through the fourth resistor; the first in-phase input end of the double operational amplifier is electrically connected with the second output end of the signal conversion unit;
The second non-inverting input end of the double operational amplifier is electrically connected with the first output end of the double operational amplifier; the second inverting input end of the double operational amplifier is electrically connected with an external power supply through the fifth resistor, and is grounded through the sixth resistor;
and the second output end of the double operational amplifier is electrically connected with the first input end of the singlechip through the seventh resistor.
Optionally, the voltage detection circuit includes a rectifying unit, a voltage dividing unit and a clamping unit;
the first input end of the rectifying unit is electrically connected with the positive electrode output end of the connector, and the second input end of the rectifying unit is electrically connected with the negative electrode output end of the connector; the first output end of the rectifying unit is electrically connected with the first end of the voltage dividing unit, and the second output end of the rectifying unit is electrically connected with the second end of the voltage dividing unit and grounded;
The input end of the clamping unit is electrically connected with the third end of the voltage dividing unit and the second input end of the singlechip, and the output end of the clamping unit is electrically connected with an external power supply.
Optionally, the voltage dividing unit includes an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor;
the eighth resistor, the ninth resistor and the tenth resistor are connected in series between the first output end of the rectifying unit and the first end of the eleventh resistor;
The first end of the eleventh resistor is also connected between the input end of the clamping unit and the second input end of the singlechip, and the second end of the eleventh resistor is grounded.
Optionally, the clamping unit includes a clamping diode;
The positive pole of the clamping diode is electrically connected with the third end of the voltage dividing unit and the second input end of the singlechip, and the negative pole of the clamping diode is connected with the external power supply.
Optionally, the voltage detection circuit further includes: a first filtering unit and a second filtering unit;
The first end of the first filtering unit is electrically connected with the first output end of the rectifying unit and the first end of the voltage dividing unit, and the second end of the first filtering unit is electrically connected with the second output end of the rectifying unit and is grounded;
the first end of the second filtering unit is electrically connected with the third end of the voltage dividing unit, the second end of the second filtering unit is electrically connected with the input end of the clamping unit and the second input end of the singlechip, and the third end of the second filtering unit is grounded.
Optionally, the first filtering unit includes: a second capacitor;
the first end of the second capacitor is electrically connected with the first output end of the rectifying unit and the first end of the voltage dividing unit, and the second end of the second capacitor is electrically connected with the second output end of the rectifying unit and the second end of the voltage dividing unit and grounded.
Optionally, the second filtering unit includes: a twelfth resistor and a third capacitor;
The first end of the twelfth resistor is electrically connected with the third end of the voltage dividing unit, the second end of the twelfth resistor is electrically connected with the first end of the third capacitor, the input end of the clamping unit and the second input end of the singlechip, and the second end of the third capacitor is grounded.
Optionally, the detection circuit of the actual contact resistance of the connector further includes: an alarm unit; the singlechip comprises a first control end;
The first control end is electrically connected with the alarm unit;
The single chip microcomputer is also used for outputting an alarm control signal through the first control end when the actual contact resistance of the connector exceeds a preset resistance value; or, the singlechip is further used for outputting an alarm control signal through the first control end when the difference value between the actual contact resistance and the theoretical contact resistance of the connector exceeds a preset difference value;
the alarm unit is used for alarming according to the alarm control signal.
Optionally, the single-chip microcomputer further comprises a second control end;
the second control end is electrically connected with the switch control end of the load;
The singlechip is also used for outputting a closing control signal to the load through the second control end when the actual contact resistance of the connector exceeds a preset resistance value;
or the singlechip is further used for outputting a closing control signal to the load through the second control end when the difference value between the actual contact resistance and the theoretical contact resistance of the connector exceeds a preset difference value.
According to another aspect of the present invention, there is provided a power supply device including a connector, an electronic control board, and the above-described detection circuit of actual contact resistance of the connector.
According to the detection circuit of the actual contact resistance of the connector, the detection resistor is arranged to be connected in parallel with the connector, so that the voltage signals at the two ends of the connector can be determined according to the voltage signals at the two ends of the detection resistor, the induced current signals are obtained through the induction of the current signals flowing through the detection resistor by the mutual inductor, the current detection circuit can output the first detection signals to the singlechip according to the induced current signals, the singlechip can determine the voltage signals at the two ends of the connector according to the first detection signals, in order to avoid the influence of abnormal fluctuation of the power signals on the detection of the actual contact resistance of the connector, the voltage detection circuit is electrically connected to the output end of the connector, the fluctuation condition of the output resistance of the connector is detected in real time, and therefore the singlechip can compensate the first detection voltage signals or the voltage at the two ends of the determined connector according to the fluctuation condition, so that the influence of the abnormal fluctuation of the power signals on the actual contact resistance of the connector can be avoided, the reliability and the accuracy of the actual contact resistance of the detection connector are improved, the situation that users are misjudged due to the detection result is misjudged, namely the situation that the user misjudges is caused, the situation that the electric control board is bad is caused, and the situation that the connection is bad is caused due to the fact that the electric control board is bad is caused, and the situation is bad is caused.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a detection circuit for actual contact resistance of a connector according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a transformer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit for detecting actual contact resistance of another connector according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit for detecting actual contact resistance of a connector according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a current detection circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a voltage detection circuit according to an embodiment of the present invention;
Fig. 7 is a schematic diagram of a voltage detection circuit according to another embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a detection circuit for actual contact resistance of a connector according to an embodiment of the present invention, where a connector 01 is electrically connected between an electric control board 02 and a power supply, and/or the connector 01 is electrically connected between a load 03 and the electric control board 02, and includes: the detection resistor R0, the transformer T0, the current detection circuit 10, the voltage detection circuit 20 and the singlechip U1; one end of the detection resistor R0 is electrically connected with the positive electrode input end of the connector 01, and the second end of the detection resistor R0 is electrically connected with the positive electrode output end of the connector 01; fig. 2 is a schematic structural diagram of a transformer according to an embodiment of the present invention, and, as shown in fig. 1 and 2, a transformer T0 includes a primary winding L1 and a secondary winding L2; the first end of the primary winding L1 is suspended, and the second end of the primary winding L1 is grounded to GND; the secondary winding L2 is electrically connected to the input terminal of the current detection circuit 10 (the connection node includes q1 and q 2); a connecting wire between the second end of the detection resistor R0 and the positive output end of the connector 01 penetrates through a coil of the transformer T0; the transformer T0 is configured to obtain an induced current signal according to a current signal flowing through the detection resistor R0, and output the induced current signal to the current detection circuit 10; the output end of the current detection circuit 10 is electrically connected with the singlechip U1; the current detection circuit 10 is used for outputting a first detection signal to the singlechip U1 according to the induced current signal; the voltage detection circuit 20 is respectively and electrically connected with the output end of the connector 01 and the singlechip U1; the voltage detection circuit 20 is configured to obtain an output voltage signal of the connector 01, and output a second detection signal to the singlechip U1 according to the output voltage signal; the singlechip U1 is used for determining the actual contact resistance r1 of the connector 01 according to the first detection signal and the second detection signal.
Specifically, the connector 01 may include 250 inserting pieces, 187 inserting pieces, VH sockets, and the like, and the connector 01 may be disposed between a power line of a power supply and the electric control board 02 to achieve electrical connection between the electric control board 02 and the power supply, or when the load 03 is a high-power load, the connector 01 may also be disposed between the electric control board 02 and the load 03 to achieve electrical connection between the electric control board 02 and the load 03, and in other possible embodiments of the present invention, the connector 01 may also be disposed between the power line of the power supply and the electric control board 02 and between the electric control board 02 and the load 03, respectively. For convenience of explanation, the following embodiments will be exemplified by only the case where the connector 01 is provided to the power supply and the electronic control board 02, unless otherwise specified.
The power supply may be a mains supply, for convenience of understanding, a terminal on one side of the connector 01 electrically connected to the power supply may be designated as an input terminal, a terminal on one side of the connector electrically connected to the electronic control board 02 may be designated as an output terminal, one end of the connector 01 electrically connected to one phase terminal L of the three-phase power supply may be designated as an anode input terminal, a corresponding output terminal may be designated as an anode output terminal, and one end of the connector 01 electrically connected to the zero line terminal N of the power supply may be designated as a cathode input terminal, and a corresponding output terminal may be designated as a cathode output terminal. Moreover, it can be understood that the electric control board 02 may process the power signal provided by the power supply and provide the processed power signal to the load 03 end, and other functions of the electric control board 02 are not specifically limited in the embodiment of the present invention.
When the connection terminal of the connector 01 is in poor contact, the actual contact resistance r1 is larger, so that more heat is generated, and therefore, the contact condition of the connection terminal can be determined by detecting the actual contact resistance r1 of the connector 01. The detection resistor R0 may be a constant resistor and may be connected in parallel with the connector 01, so that the voltage at two ends of the detection resistor R0 is equal to the voltage at two ends of the connector 01, and after the current signal flowing through the detection resistor R0 is obtained, the voltage value at two ends of the detection resistor R may be determined according to ohm's law, that is, the voltage value V1 at two ends of the connector 01 may be determined. The current signal flowing through the connector 01 can be obtained according to the working mode of the load 03, that is, the current working current of the load 03 can be determined according to the current working mode of the load 03, and then the current signal I1 flowing through the connector 01 can be reversely determined according to the working current of the load 03, so that the actual contact resistance r1 of the connector 01 can be determined according to ohm's law. The wire connecting the detection resistor and the connector 01 can penetrate through the coil of the transformer T0, so, since the alternating current (the mains supply signal, usually 220V/50Hz alternating current) flowing through the wire has a fixed periodic variation characteristic, the varying electric field can generate a varying magnetic field, so that the coil of the transformer T0 induces alternating current in the varying magnetic field environment, the current signal flowing through the detection resistor R0 can be induced through the transformer T0, so as to obtain the current signal flowing through the detection resistor R0, and the induced current signal can be named as an induced current signal. The secondary winding L2 of the transformer T0 may be used as an effective coil, i.e., the secondary winding L2 is electrically connected to the input end of the current detection circuit 10, while the primary winding L1 of the transformer T0 may be used as an ineffective coil, with one end thereof suspended and the other end thereof grounded. Thus, the secondary winding L2 of the transformer T0 may transmit the acquired induced current signal to the current detection circuit 10, so that the current detection circuit 10 may process according to the induced current signal, so as to output a first detection signal that may be effectively recognized by the single-chip microcomputer U1, so that the single-chip microcomputer U1 may determine the voltages at two ends of the connector 01 according to the first detection signal.
In the process of supplying power to the load 03, a power signal provided by the power supply may have larger abnormal fluctuation, so that a current signal flowing through the connector 01 also has larger fluctuation, and meanwhile, a current signal flowing through the detection resistor R0 also has larger fluctuation, if voltages at two ends of the connector 01 are calculated according to the acquired induced current signal at the moment, the finally determined actual contact resistance R1 of the connector 01 is also larger, and thus misjudgment on the contact condition of the connector 01 is caused. Therefore, the voltage detection circuit 20 can be configured to detect the fluctuation of the power signal flowing through the connector 01, so that the singlechip U1 can determine the actual contact resistance r1 of the connector 01 in combination with the actual fluctuation, thereby improving the accuracy of detection. Specifically, the first input end of the voltage detection circuit 20 is electrically connected with the positive output end of the connector 01, the second input end of the voltage detection circuit 20 is electrically connected with the negative output end of the connector 01, so that a voltage signal passing through the connector 01, that is, a voltage signal to be provided to the electric control board 02 by the connector 01 can be obtained, the voltage signal can be named as an output voltage signal, the voltage detection circuit 20 processes the output voltage signal to generate a second detection signal which can be effectively identified by the single chip microcomputer U1, the single chip microcomputer U1 can determine the fluctuation condition of the output voltage signal of the connector 01 according to the second detection signal, and the single chip microcomputer U1 can determine the reliable actual contact resistance r1 of the connector 01 according to the first detection signal and the second detection signal.
For example, the single chip microcomputer U1 may include a first input terminal SIN1 and a second input terminal SIN2, where the first input terminal SIN1 is electrically connected to the output terminal of the current detection circuit 10 and is configured to receive the first detection signal, and the second input terminal SIN2 is electrically connected to the output terminal of the voltage detection circuit 20 and is configured to receive the second detection signal. The single-chip microcomputer U1 may obtain the working mode of the load 03 through a communication or electrical connection manner, so as to determine the working current according to the working mode, and further determine the theoretical current signal flowing through the connector 01 according to the working current, or the single-chip microcomputer U1 may directly obtain the working current of the load 03, which is not particularly limited in the embodiment of the present invention. The single chip microcomputer U1 can determine the voltage V1 at two ends of the connector 01 according to the first detection signal, and determine the fluctuation condition of the output voltage signal of the connector 01 according to the second detection signal, when the single chip microcomputer U1 determines that the fluctuation of the output voltage signal of the connector 01 is abnormal and large according to the second detection signal, the single chip microcomputer U1 can determine that the first detection signal which is in the same detection period with the second detection signal is abnormal, namely the determined voltage V1 at two ends of the connector 01 is large, so that the voltage V1 can be properly reduced to compensate; or when the singlechip U1 determines that the fluctuation of the output voltage signal of the connector 01 is smaller according to the second detection signal, the first detection signal which is in the same detection period with the second detection signal can be determined to be abnormal, namely the determined voltage V1 at two ends of the connector 01 is smaller, so that the voltage V1 can be appropriately increased to compensate; the actual contact resistance of the connector 01 is calculated from the compensated voltage V1', namely: r1=v1'/I1, or the voltage at two ends of the connector can be calculated by compensating the first detection signal according to the second detection signal and then according to the compensated first detection signal, so that the influence of abnormal fluctuation of the power supply signal on the actual contact resistance of the connector 01 can be avoided, the reliability and accuracy of detecting the actual contact resistance r1 of the connector 01 are improved, the contact condition of the connector 01 can be determined according to the detection result, and the situation that the electric control board 02 is burnt or even fire is caused due to excessive heat generated by poor contact of the connector 01 can be avoided.
The theoretical contact resistance of the connector 01 can be set according to the actual situation, after determining the actual contact resistance of the connector 01, the single chip microcomputer U1 can compare the actual contact resistance with the theoretical contact resistance, when the difference value of the actual contact resistance and the theoretical contact resistance exceeds a preset difference value, it can determine that the connection terminal of the connector 01 is in poor contact with the power line or the electric control board 02, specifically, when the actual contact resistance is greater than the theoretical contact resistance by a preset difference value (the preset difference value is a positive number), it can determine that the connection terminal of the connector 01 is in poor contact with the power line or the electric control board 02. Or when the singlechip U1 determines that the actual contact resistance of the connector 01 exceeds a preset resistance value, the connection terminal of the connector 01 can be determined to be in poor contact with the power line or the electric control board 02.
According to the detection circuit of the actual contact resistance of the connector, the detection resistor is arranged to be connected in parallel with the connector, so that the voltage signals at the two ends of the connector can be determined according to the voltage signals at the two ends of the detection resistor, the induced current signals are obtained through the induction of the current signals flowing through the detection resistor by the mutual inductor, the current detection circuit can output the first detection signals to the singlechip according to the induced current signals, the singlechip can determine the voltage signals at the two ends of the connector according to the first detection signals, in order to avoid the influence of abnormal fluctuation of the power signals on the detection of the actual contact resistance of the connector, the voltage detection circuit is electrically connected to the output end of the connector, the fluctuation condition of the output resistance of the connector is detected in real time, and therefore the singlechip can compensate the first detection voltage signals or the voltage at the two ends of the determined connector according to the fluctuation condition, so that the influence of the abnormal fluctuation of the power signals on the actual contact resistance of the connector can be avoided, the reliability and the accuracy of the actual contact resistance of the detection connector are improved, the situation that users are misjudged due to the detection result is misjudged, namely the situation that the user misjudges is caused, the situation that the electric control board is bad is caused, and the situation that the connection is bad is caused due to the fact that the electric control board is bad is caused, and the situation is bad is caused.
Optionally, fig. 3 is a schematic structural diagram of another circuit for detecting actual contact resistance of a connector according to an embodiment of the present invention, as shown in fig. 3, where the circuit for detecting actual contact resistance of a connector further includes an alarm unit 30; the singlechip U1 comprises a first control end CO1; the first control end CO1 is electrically connected with the alarm unit 30; the singlechip U1 is also used for outputting an alarm control signal through the first control end CO1 when the actual contact resistance of the connector 01 is determined to exceed a preset resistance value; or, the single chip microcomputer U1 is further used for outputting an alarm control signal through the first control end CO1 when the difference value between the actual contact resistance and the theoretical contact resistance of the connector 01 exceeds a preset difference value; the alarm unit 30 is used for alarming according to the alarm control signal.
Specifically, the alarm unit 30 may include at least one of a buzzer, a warning lamp, and the like, and when the singlechip U1 determines that the actual contact resistance of the connector exceeds the preset resistance value, or when the singlechip U1 determines that the difference between the actual contact resistance and the theoretical contact resistance of the connector is greater than the preset difference value, the alarm unit 30 outputs an alarm control signal through the first control end CO1, so that the alarm unit 30 can alarm according to the alarm control signal, prompt a user in time, so that the user can conveniently perform operations such as power-off on the load 03, and the like, thereby avoiding burning out the electric control board 02 and even occurrence of fire hazards and the like.
Optionally, with continued reference to fig. 3, the single-chip microcomputer U1 further includes a second control end CO2; the second control end CO2 is electrically connected with the switch control end of the load 03; the singlechip U1 is also used for outputting a closing control signal to the load 03 through the second control end CO2 when the actual contact resistance of the connector 01 is determined to exceed a preset resistance value; or, the single chip microcomputer U1 is further configured to output a closing control signal to the load 03 through the second control terminal CO2 when it is determined that the difference between the actual contact resistance and the theoretical contact resistance of the connector 01 exceeds a preset difference.
Specifically, the single-chip connector U1 may be further electrically connected to the switch control end of the load 03, and when the actual contact resistance of the connector 01 exceeds a preset resistance value, or when the difference between the actual contact resistance of the connector 01 and the theoretical contact resistance exceeds a preset difference value, a closing control signal may be output to the switch control end of the load 03 through the second control end CO2, so that the load 03 can stop working according to the closing control signal, and no power supply signal is received any more. In other possible embodiments of the present invention, the second control end CO2 of the single chip microcomputer U1 may also be connected to the switch control end of the load 03 in a communication manner, which is not particularly limited in the embodiments of the present invention. In addition, the switch control end of the load 03 may also be a controllable switch disposed between the power supply end of the load 03 and the electric control board 02, so that the second control end CO2 of the single chip microcomputer U1 is electrically connected with the control end of the controllable switch, so as to realize the electrical connection between the electric control board 02 and the power supply end of the load 03. Therefore, the electric connection between the load 03 and the electric control board 02 or between the load 03 and the connector 01 can be timely disconnected when the contact of the connecting terminal of the connector 01 is poor and the connection condition is poor, so that a large amount of heat generated due to the poor contact of the connector 01 can be effectively avoided, the risk which possibly occurs can be actively predicted, the risk and unnecessary dangerous conditions can be actively and effectively eliminated, and the active protection function is realized.
Optionally, fig. 4 is a schematic structural diagram of a detection circuit of an actual contact resistance of a connector according to an embodiment of the present invention, and as shown in fig. 4, a current detection circuit 10 includes a signal conversion unit 11 and a signal processing unit 12; the signal conversion unit 11 is electrically connected with the secondary winding L2 and the signal processing unit 12, and the signal conversion unit 11 is used for converting the received induced current signal into an induced voltage signal; the signal processing unit 12 is also electrically connected with the singlechip U1; the signal processing unit 12 is configured to output a first detection signal to the single-chip microcomputer U1 according to the induced voltage signal.
Specifically, the first input end of the signal conversion unit 11 is electrically connected with the first end of the secondary side winding L2, the second input end of the second end of the signal conversion unit 11 is electrically connected with the second end of the secondary side winding L2, the first output end of the signal conversion unit 11 is electrically connected with the first input end of the signal processing unit, and the second output end of the signal conversion unit 11 is electrically connected with the second input end of the signal processing unit; the signal conversion unit 11 can form a current loop with the secondary coil L2, thereby converting an induced current signal flowing through the secondary coil L2 into a induced voltage signal, and transmitting the voltage signal to the signal processing unit 12. The output end of the signal processing unit 12 may be electrically connected to the first input end SIN1 of the single chip microcomputer U1, so that the signal processing unit 12 may amplify and compare the received induced voltage signal, and may output the amplified and compared signal as the first detection signal to the first input end SIN1 of the single chip microcomputer U1.
Optionally, fig. 5 is a schematic structural diagram of a current detection circuit according to an embodiment of the present invention, and as shown in fig. 5, the signal conversion unit 11 includes a first resistor R1, a second resistor VR1, and a first capacitor C1; the first end of the first resistor R1 is electrically connected with the first end of the secondary side winding L2, and the second end of the first resistor R1 is electrically connected with the first end of the second resistor R2; a first end of the first capacitor C1 is electrically connected to a second end of the second resistor R2 and a first input end of the signal processing unit 12, and a second end of the first capacitor C1 is electrically connected to a second end of the secondary winding L2 and a second input end of the signal processing unit 12.
Specifically, the first resistor R1 and the second resistor R2 are used for current limiting, the induced current signal flowing through the secondary winding L2 of the transformer T0 can charge the first capacitor C1 through the first resistor R1 and the second resistor R2, it can be understood that the induced current signal is directly proportional to the voltages at two ends of the first capacitor C1, two ends of the first capacitor C1 are respectively electrically connected with the first input end and the second input end of the signal processing unit 12, and therefore the signal processing unit 12 can process the voltages at two ends of the first capacitor C1 and then output the first detection signal.
For example, the first capacitor C1 is preferably an electrolytic capacitor, and the electrolytic capacitor has the characteristics of high capacitance density and good stability, and when the first capacitor C1 is an electrolytic capacitor, the positive terminal of the first capacitor C1 may be electrically connected to the second terminal of the second resistor R2 and the first input terminal of the signal processing unit 12, and the negative terminal of the first capacitor C1 may be electrically connected to the second terminal of the secondary winding L2 and the second input terminal of the signal processing unit 12.
Optionally, referring to fig. 5, the signal processing unit 12 includes a dual operational amplifier U2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7; the first inverting input terminal IN 1-of the double operational amplifier U1 is electrically connected with the first output terminal of the signal conversion unit 11 through a third resistor R3, and the first inverting input terminal IN 1-of the double operational amplifier U2 is also electrically connected with the first output terminal OUT1 of the double operational amplifier U2 through a fourth resistor R4; the first IN1+ IN the same phase input end of the double operational amplifier U2 is electrically connected with the second output end of the signal conversion unit 11; the second non-inverting input end In2+ of the double operational amplifier U2 is electrically connected with the first output end OUT1 of the double operational amplifier U2; the second inverting input terminal IN 2-of the double operational amplifier U2 is electrically connected with an external power supply VCC through a fifth resistor R5, and the second inverting input terminal IN 2-of the double operational amplifier U2 is also grounded through a sixth resistor R6; the second output end OUT2 of the double operational amplifier U2 is electrically connected with the first input end SIN1 of the single chip microcomputer U1 through a seventh resistor R7.
Specifically, since the detection resistor R0 is connected in parallel with the connector 01, the resistance of the detection resistor R0 is inversely proportional to the power consumption generated by the detection resistor R0 and the connector 01, and the resistance of the detection resistor R0 is not too small in consideration of the power consumption and the detection accuracy, the current flowing through the detection resistor R0 is weak at this time, so that the voltage across the first capacitor C1 is small, and therefore the signal processing circuit may further include a dual operational amplifier U2 amplifier to effectively amplify the voltage across the first capacitor C1. The dual operational amplifier U2 may preferably be a chip LM358 including a first operational amplifier U21 and a second operational amplifier U22, and then the first operational amplifier U21 may include a first IN-phase input terminal in1+, a first inverting input terminal in1+ and a first output terminal OUT1, and the second operational amplifier U22 may include a second IN-phase input terminal in2+, a second inverting input terminal in2+ and a first output terminal OUT2, and it may also be understood that the first IN-phase input terminal in1+, the first inverting input terminal IN1+ and the first output terminal OUT1 form an operational amplifier channel, and the second IN-phase input terminal in2+, The second inverting input terminal IN 2-and the first output terminal OUT2 constitute an operational amplifier channel. The first inverting input terminal IN 1-is electrically connected to the positive terminal of the first capacitor C1 through the third resistor R3, the first IN-phase input terminal in1+ is electrically connected to the negative terminal of the first capacitor C1, and the first inverting input terminal IN 1-is also connected to the first output terminal OUT1, so that the first operational amplifier U21 can amplify the voltage signal at both ends of the first capacitor C1, the first output terminal OUT1 is also electrically connected to the second IN-phase input terminal in2+, so that the amplified voltage signal (for convenience of explanation, hereinafter referred to as amplified signal) can be transmitted to the second IN-phase input terminal in2+ of the second operational amplifier U22, the second operational amplifier U22 can be used as a comparator, The second reverse input end IN 2-is electrically connected to the first node a, the fifth resistor R5 and the sixth resistor R6 are voltage dividing resistors, the resistance values of the fifth resistor R5 and the sixth resistor R6 can be set according to design requirements, the potential va=5v×r6/(r5+r6) ×v of the first node a is the reference voltage signal, the amplified signal received by the second IN-phase input end in2+ is compared with the reference voltage signal received by the second reverse input end IN2-, when the amplified signal is greater than the reference voltage signal, the second output end OUT2 outputs a high level, when the amplified signal is less than the reference voltage signal, The second output terminal OUT2 outputs a low level, so that according to the periodic variation of the induced current signal, the first detection signal which can be output by the second output terminal OUT2 is a square wave signal with a fixed period, so that the magnitude of the induced current signal can be calculated according to the width of the square wave, the magnitude of the current flowing through the detection resistor R0 can be further known, and the voltages at two ends of the detection resistor R0, namely the voltage V1 at two ends of the connector 01, can be obtained according to ohm's law. in addition, the dual operational amplifier U2 further includes a power supply terminal VCC1 and a ground terminal GND1, where the power supply terminal VCC1 may be electrically connected to the external power supply VCC, and the ground terminal GND1 is grounded.
For example, since there may be an error in the parameter of the transformer T0, the square wave width of the first detection signal transmitted to the single chip microcomputer U1 will be affected, so the second resistor R2 may be set as an adjustable resistor, and the second resistor R2 is calibrated before the actual contact resistance detection circuit of the connector or the integrated product including the circuit leaves the factory.
Alternatively, referring to fig. 4, the voltage detection circuit 20 includes a rectifying unit 21, a voltage dividing unit 22, and a clamping unit 23; a first input end of the rectifying unit 21 is electrically connected with an anode output end of the connector 01, and a second input end of the rectifying unit 21 is electrically connected with a cathode output end of the connector 01; a first output end of the rectifying unit 21 is electrically connected with a first end of the voltage dividing unit 22, and a second output end of the rectifying unit 21 is electrically connected with a second end of the voltage dividing unit 22 and grounded; the input end of the clamping unit 23 is electrically connected with the third end of the voltage dividing unit 22 and the second input end SIN2 of the singlechip U1, and the output end of the clamping unit 23 is electrically connected with an external power supply VCC.
Specifically, the positive input terminal and the negative input terminal of the connector 01 receive the ac electric signal, and are only used for transmitting the electric signal, so that the ac electric signal of the positive output terminal and the negative output terminal on the side close to the electric control board 02 can be obtained, so that the power signal transmitted by the connector 01 can be detected more reliably. It may be assumed that a connection node between the first input end of the rectifying unit 21 and the positive output end of the connector 01 is the second node b, a connection node between the second input end of the rectifying unit 21 and the negative output end of the connector 01 is the third node c, the rectifying unit 21 can rectify an ac voltage signal transmitted by the connector 01 into a relatively stable dc voltage signal, the dc voltage signal is divided by the voltage dividing unit 22 to generate a second detection signal, and the second detection signal is transmitted to the second input end SIN2 of the single-chip microcomputer U1, the clamping unit 23 is used for protecting the single-chip microcomputer U1, when the second detection signal provided to the single-chip microcomputer U1 has a risk of damaging the single-chip microcomputer U1, the clamping unit 23 can clamp a voltage provided to the second input end SIN2 of the single-chip microcomputer U1 at a preset voltage value, so as to avoid damaging the single-chip microcomputer U1 due to excessive power signal surge transmitted by the connector 01, so as to damage a detection circuit of an actual contact resistance of the whole connector, thereby causing unnecessary economic loss.
Fig. 6 is a schematic diagram of a voltage detection circuit according to an embodiment of the present invention, as shown in fig. 6, the rectifying unit 21 may include a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, where an anode of the first diode D1 and a cathode of the fourth transistor D4 are electrically connected to the second node b, a cathode of the first diode D1 and a cathode of the second diode D2 are electrically connected to the first end of the voltage dividing unit 22, an anode of the third transistor D3 and an anode of the second diode D2 are electrically connected to the third node c, and an anode of the third transistor D3 and an anode of the fourth transistor D4 are electrically connected to the second end of the voltage dividing unit 22 and grounded GND.
Alternatively, referring to fig. 6, the voltage dividing unit 21 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11; the eighth resistor R7, the ninth resistor R8, and the tenth resistor R9 are connected in series between the first output terminal of the rectifying unit 21 and the first terminal of the eleventh resistor R11; the first end of the eleventh resistor R11 is further connected between the input end of the clamping unit 23 and the second input end SIN2 of the singlechip U1, and the second end of the eleventh resistor R11 is grounded GND.
Specifically, the dc voltage output by the rectifying unit 21 may be divided by the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, and the eleventh resistor R11 that are connected in series, and if the dc voltage output by the rectifying unit 21 is V2 and the connection node between the tenth resistor R10 and the eleventh resistor R11 is the fourth node d, the potential vd=v2×r11/(r8+r9+r10+r11) of the fourth node d is equal to vd=v2/(r8+r9+r11), the second input terminal SIN2 of the single chip U1 and the input terminal of the clamping unit 23 are electrically connected to the fourth node d, and the voltage signal of the fourth node d may be transmitted to the second input terminal SIN2 of the single chip U1 as the second detection signal, and when the voltage signal of the fourth node d is too large, the clamping unit 23 clamps the voltage provided to the second input terminal SIN2 of the single chip U1 at the preset voltage value.
Optionally, with continued reference to fig. 6, the clamping unit 23 includes a clamping diode D0; the positive pole of the clamping diode D0 is electrically connected with the third end of the voltage division unit 22 and the second input end SIN2 of the singlechip U1, and the negative pole of the clamping diode D2 is connected with an external power supply VCC.
Specifically, the conduction threshold of the clamping diode D0 may be 0.7V, and the voltage signal provided by the external power supply VCC may be 5V, so that when the voltage value of the second detection signal is greater than 5.7V, the clamping diode D2 is turned on, so that the voltage of the second input terminal SIN2 of the single-chip microcomputer U1 may be clamped at 5.7V, and thus, the damage to the single-chip microcomputer U1 caused by the excessive voltage of the second detection signal can be effectively avoided.
Optionally, fig. 7 is a schematic structural diagram of another voltage detection circuit according to an embodiment of the present invention, and as shown in fig. 7, the voltage detection circuit 22 further includes: a first filtering unit 24 and a second filtering unit 25; a first end of the first filtering unit 24 is electrically connected to the first output end of the rectifying unit 21 and the first end of the voltage dividing unit 22, and a second end of the first filtering unit 24 is electrically connected to the second output end of the rectifying unit 21 and the ground GND; the first end of the second filtering unit 25 is electrically connected with the third end of the voltage dividing unit 22, the second end of the second filtering unit 25 is electrically connected with the input end of the clamping unit 23 and the second input end SIN2 of the single chip microcomputer U1, and the third end of the second filtering unit 25 is grounded GND.
Specifically, the first filtering unit 24 is configured to filter the dc voltage output by the rectifying unit 21 to remove the clutter signal, and improve the stability of the dc voltage signal. The second filter circuit 25 is configured to filter a second detection signal provided to the second input terminal SIN2 of the single chip U1, and also has a noise removing function, so as to improve stability of the second detection signal.
Alternatively, referring to fig. 7, the first filtering unit 24 includes: a second capacitor C2; the first end of the second capacitor C2 is electrically connected to the first output terminal of the rectifying unit 21 and the first end of the voltage dividing unit 22, and the second end of the second capacitor C2 is electrically connected to the second output terminal of the rectifying unit 21 and the second end of the voltage dividing unit 22 and the ground GND.
Specifically, the first end of the second capacitor C2 is electrically connected to the cathode of the first diode D1 and the cathode of the second diode D2, the first end of the second capacitor C2 is electrically connected to the fourth node D through an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10, which are connected in series, and the second end of the second capacitor C2 is electrically connected to the anode of the third diode D3, the anode of the fourth diode D4 and the second end of the eleventh resistor R11, and is grounded GND, so that the second resistor C2 can filter the dc voltage output by the rectifying unit 21, and stability of the dc voltage signal is improved.
Optionally, with continued reference to fig. 7, the second filtering unit 25 includes: a twelfth resistor R12 and a third capacitor C3; the first end of the twelfth resistor R12 is electrically connected to the third end of the voltage dividing unit 22, the second end of the twelfth resistor R12 is electrically connected to the first end of the third capacitor C3, the input end of the clamping unit 23 and the second input end SIN2 of the single chip U1, and the second end of the third capacitor C3 is grounded GND.
Specifically, the first end of the twelfth resistor R12 is electrically connected to the fourth node D, the second end of the twelfth resistor R12 is electrically connected to the first end of the third capacitor C3, the anode of the clamping diode D0, and the second input end SIN2 of the single chip U1, and the second end of the third capacitor C3 is grounded GND. The third capacitor C3 can filter the second detection signal, and meanwhile, the twelfth resistor R12 can limit the current of the second detection signal transmitted to the second input end SIN2 of the single chip microcomputer U1.
Based on the same inventive concept, the embodiment of the present invention further provides a power supply device, where the power supply device includes a connector, an electric control board, and a circuit for detecting actual contact resistance of the connector provided by any embodiment of the present invention, so that the power supply device provided by the embodiment of the present invention includes technical features of the circuit for detecting actual contact resistance of the connector provided by any embodiment of the present invention, and can achieve beneficial effects of the circuit for detecting actual contact resistance of the connector provided by any embodiment of the present invention, and the same features may refer to the description of the circuit for detecting actual contact resistance of the connector provided by any embodiment of the present invention, and are not repeated herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (13)
1. A detection circuit for actual contact resistance of a connector electrically connected between an electric control board and a power supply, and/or between a load and the electric control board, comprising: the device comprises a detection resistor, a transformer, a current detection circuit, a voltage detection circuit and a singlechip;
one end of the detection resistor is electrically connected with the positive electrode input end of the connector, and the second end of the detection resistor is electrically connected with the positive electrode output end of the connector;
The transformer comprises a primary side winding and a secondary side winding; the first end of the primary side winding is suspended, and the second end of the primary side winding is grounded; the secondary side winding is electrically connected with the input end of the current detection circuit; a connecting wire between the second end of the detection resistor and the positive output end of the connector penetrates through the coil of the transformer; the mutual inductor is used for acquiring an induced current signal according to a current signal flowing through the detection resistor and outputting the induced current signal to the current detection circuit;
the output end of the current detection circuit is electrically connected with the singlechip; the current detection circuit is used for outputting a first detection signal to the singlechip according to the induced current signal;
The voltage detection circuit is electrically connected with the output end of the connector and the singlechip respectively; the voltage detection circuit is used for acquiring an output voltage signal of the connector and outputting a second detection signal to the singlechip according to the output voltage signal;
The singlechip is used for determining the actual contact resistance of the connector according to the first detection signal and the second detection signal.
2. The circuit for detecting actual contact resistance of a connector according to claim 1, wherein the current detection circuit includes a signal conversion unit and a signal processing unit;
the signal conversion unit is respectively and electrically connected with the secondary side winding and the signal processing unit and is used for converting a received induced current signal into an induced voltage signal;
the signal processing unit is also electrically connected with the singlechip; the signal processing unit is used for outputting a first detection signal to the singlechip according to the induced voltage signal.
3. The circuit for detecting actual contact resistance of a connector according to claim 2, wherein the signal conversion unit comprises a first resistor, a second resistor, and a first capacitor;
A first end of the first resistor is electrically connected with a first end of the secondary side winding, and a second end of the first resistor is electrically connected with a first end of the second resistor;
the first end of the first capacitor is electrically connected with the second end of the second resistor and the first input end of the signal processing unit, and the second end of the first capacitor is electrically connected with the second end of the secondary side winding and the second input end of the signal processing unit.
4. The circuit for detecting actual contact resistance of a connector according to claim 2, wherein the signal processing unit includes a dual operational amplifier, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;
the first inverting input end of the double operational amplifier is electrically connected with the first output end of the signal conversion unit through the third resistor, and the first inverting input end of the double operational amplifier is also electrically connected with the first output end of the double operational amplifier through the fourth resistor; the first in-phase input end of the double operational amplifier is electrically connected with the second output end of the signal conversion unit;
The second non-inverting input end of the double operational amplifier is electrically connected with the first output end of the double operational amplifier; the second inverting input end of the double operational amplifier is electrically connected with an external power supply through the fifth resistor, and is grounded through the sixth resistor;
and the second output end of the double operational amplifier is electrically connected with the first input end of the singlechip through the seventh resistor.
5. The circuit for detecting actual contact resistance of a connector according to claim 1, wherein the voltage detection circuit comprises a rectifying unit, a voltage dividing unit, and a clamping unit;
the first input end of the rectifying unit is electrically connected with the positive electrode output end of the connector, and the second input end of the rectifying unit is electrically connected with the negative electrode output end of the connector; the first output end of the rectifying unit is electrically connected with the first end of the voltage dividing unit, and the second output end of the rectifying unit is electrically connected with the second end of the voltage dividing unit and grounded;
The input end of the clamping unit is electrically connected with the third end of the voltage dividing unit and the second input end of the singlechip, and the output end of the clamping unit is electrically connected with an external power supply.
6. The circuit for detecting actual contact resistance of a connector according to claim 5, wherein the voltage dividing unit includes an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor;
the eighth resistor, the ninth resistor and the tenth resistor are connected in series between the first output end of the rectifying unit and the first end of the eleventh resistor;
The first end of the eleventh resistor is also connected between the input end of the clamping unit and the second input end of the singlechip, and the second end of the eleventh resistor is grounded.
7. The circuit for detecting actual contact resistance of a connector according to claim 5, wherein the clamp unit includes a clamp diode;
The positive pole of the clamping diode is electrically connected with the third end of the voltage dividing unit and the second input end of the singlechip, and the negative pole of the clamping diode is connected with the external power supply.
8. The circuit for detecting actual contact resistance of a connector according to claim 5, wherein the voltage detection circuit further comprises: a first filtering unit and a second filtering unit;
The first end of the first filtering unit is electrically connected with the first output end of the rectifying unit and the first end of the voltage dividing unit, and the second end of the first filtering unit is electrically connected with the second output end of the rectifying unit and is grounded;
the first end of the second filtering unit is electrically connected with the third end of the voltage dividing unit, the second end of the second filtering unit is electrically connected with the input end of the clamping unit and the second input end of the singlechip, and the third end of the second filtering unit is grounded.
9. The circuit for detecting actual contact resistance of a connector according to claim 8, wherein the first filtering unit includes: a second capacitor;
the first end of the second capacitor is electrically connected with the first output end of the rectifying unit and the first end of the voltage dividing unit, and the second end of the second capacitor is electrically connected with the second output end of the rectifying unit and the second end of the voltage dividing unit and grounded.
10. The circuit for detecting actual contact resistance of a connector according to claim 8, wherein the second filter unit includes: a twelfth resistor and a third capacitor;
The first end of the twelfth resistor is electrically connected with the third end of the voltage dividing unit, the second end of the twelfth resistor is electrically connected with the first end of the third capacitor, the input end of the clamping unit and the second input end of the singlechip, and the second end of the third capacitor is grounded.
11. The circuit for detecting actual contact resistance of a connector according to claim 1, further comprising: an alarm unit; the singlechip comprises a first control end;
The first control end is electrically connected with the alarm unit;
The single chip microcomputer is also used for outputting an alarm control signal through the first control end when the actual contact resistance of the connector exceeds a preset resistance value; or, the singlechip is further used for outputting an alarm control signal through the first control end when the difference value between the actual contact resistance and the theoretical contact resistance of the connector exceeds a preset difference value;
the alarm unit is used for alarming according to the alarm control signal.
12. The circuit for detecting actual contact resistance of a connector according to claim 1, wherein the single-chip microcomputer further comprises a second control end;
the second control end is electrically connected with the switch control end of the load;
The singlechip is also used for outputting a closing control signal to the load through the second control end when the actual contact resistance of the connector exceeds a preset resistance value;
or the singlechip is further used for outputting a closing control signal to the load through the second control end when the difference value between the actual contact resistance and the theoretical contact resistance of the connector exceeds a preset difference value.
13. A power supply device comprising a connector, an electric control board and a detection circuit for actual contact resistance of the connector according to any one of claims 1 to 12.
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| CN104061180A (en) * | 2014-06-18 | 2014-09-24 | 台安科技(无锡)有限公司 | Fan PWM (Pulse Width Modulation) speed regulation energy-saving control system and control method with temperature prediction |
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| CN105486971A (en) * | 2015-11-13 | 2016-04-13 | 浙江涵普电力科技有限公司 | Short circuit and open circuit state detection circuit for secondary side winding of current transformer |
| CN206712473U (en) * | 2017-05-16 | 2017-12-05 | 郑州博创电气设备有限公司 | A kind of three-phase imbalance automatic straightening system |
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| CN104061180A (en) * | 2014-06-18 | 2014-09-24 | 台安科技(无锡)有限公司 | Fan PWM (Pulse Width Modulation) speed regulation energy-saving control system and control method with temperature prediction |
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| 计量装置互感器二次回路接线自动检测研究;韩兴;王海滨;苏慧琳;高腾;;电子测量技术;20200708(第13期);全文 * |
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