CN113133138B - Heating circuit - Google Patents
Heating circuit Download PDFInfo
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- CN113133138B CN113133138B CN201911417898.1A CN201911417898A CN113133138B CN 113133138 B CN113133138 B CN 113133138B CN 201911417898 A CN201911417898 A CN 201911417898A CN 113133138 B CN113133138 B CN 113133138B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 229
- 238000001514 detection method Methods 0.000 claims abstract description 79
- 239000003990 capacitor Substances 0.000 claims description 88
- 238000010411 cooking Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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Abstract
The embodiment of the invention discloses a control circuit, which comprises: the power supply comprises an inverter circuit, a first switching device, a second switching device, a heating element, a detection circuit, a first power supply and a second power supply; if the first end of the first switching device is connected with the second end of the first switching device and the first end of the second switching device is connected with the second end of the second switching device, the first power supply, the heating element and the inverter circuit form a first loop, and the first power supply supplies power to the heating element through the first loop; if the first end of the first switching device is connected with the third end of the first switching device and the first end of the second switching device is connected with the third end of the second switching device, the second power supply, the detection circuit and the heating element form a second loop, and the second power supply supplies power to the heating element and the detection circuit through the second loop.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a heating circuit.
Background
Before the household appliance is heated, the impedance of a heating element of the household appliance can be detected to determine whether cooking equipment and the like exist on the heating element, so that the heating condition caused by the fact that no cooking equipment and the like exist on the heating element can be greatly reduced. At present, a loop for heating a heating element and a loop for detecting whether the heating element has cooking equipment can affect each other, and isolation cannot be realized, so that the situation that the impedance of the heating element is detected inaccurately or the heating current of the heating element is too large is caused.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a heating circuit.
The technical scheme of the embodiment of the invention is realized as follows:
a heating circuit, the heating circuit comprising: the power supply comprises an inverter circuit, a first switching device, a second switching device, a heating element, a detection circuit, a first power supply and a second power supply; wherein,
a first end of the first switching device is connected with a first end of the heating element, a second end of the first switching device is connected with a first end of the inverter circuit, and a third end of the first switching device is connected with a first end of the detection circuit;
a first end of the second switching device is connected with a second end of the heating element, a second end of the second switching device is connected with a second end of the inverter circuit, and a third end of the second switching device is connected with a second end of the detection circuit;
if the first end of the first switching device is connected with the second end of the first switching device and the first end of the second switching device is connected with the second end of the second switching device, the first power supply, the heating element and the inverter circuit form a first loop, the first power supply supplies power to the heating element through the first loop, and the heating element generates heat based on the power supply of the first power supply;
if the first end of the first switching device is connected with the third end of the first switching device and the first end of the second switching device is connected with the third end of the second switching device, the second power supply, the detection circuit and the heating element form a second loop, and the second power supply supplies power to the heating element and the detection circuit through the second loop.
In the above solution, the first power supply is a power supply for obtaining a first voltage, and the second power supply is a power supply for obtaining a second voltage; wherein the first voltage is greater than the second voltage;
or,
when the first power supply supplies power to the heating element through the first loop, the current flowing through the second heating element is a first current;
when the second power supply supplies power to the heating element through the second loop, the current flowing through the heating element is a second current;
wherein the first current is greater than the second current.
In the above aspect, the heating circuit includes: a first control circuit and a second control circuit;
the first control circuit is connected with the first switching device and is used for sending a first control signal for conducting a first end of the first switching device and a second end of the first switching device, or sending a second control signal for conducting the first end of the first switching device and a third end of the first switching device;
the second control circuit is connected to the second switching device and configured to send a third control signal for turning on the first end of the second switching device and the second end of the second switching device, or send a fourth control signal for turning on the first end of the second switching device and the third end of the second switching device.
In the above solution, the first switching device includes: a single pole double throw relay, the second switching device comprising: single pole double throw relay.
In the above scheme, the detection circuit includes: the MOS transistor comprises a first MOS transistor, a second MOS transistor and a first resistor;
the drain electrode of the first MOS tube is connected with the second power supply, and the source electrode of the first MOS tube is respectively connected with the drain electrode of the second MOS tube and the third end of the first switching device;
the source electrode of the second MOS tube is grounded, and the source electrode of the second MOS tube is also connected with the first end of the first resistor;
and the second end of the first resistor is connected with the third end of the second switching device.
In the above scheme, the detection circuit includes: a first capacitor, a second capacitor and a second resistor;
the first end of the first capacitor is connected with the second power supply, and the second end of the first capacitor is respectively connected with the first end of the second capacitor and the third end of the first switching device;
the second end of the second capacitor is grounded, and the second end of the second capacitor is also connected with the first end of the second resistor;
and the second end of the second resistor is connected with the third end of the second switching device.
In the above aspect, the inverter circuit includes: a first IGBT and a second IGBT;
the collector of the first IGBT is connected with the first power supply, and the emitter of the first IGBT is connected with the collector of the second IGBT; the emitter of the second IGBT is grounded;
the first end of the first switching device is connected with the emitter of the first IGBT, and the second end of the second switching device is connected with the collector of the first IGBT.
In the above scheme, the heating circuit further includes: a third capacitor and a fourth capacitor; wherein,
the third capacitor is connected between the first power supply and the second end of the second switching device;
a first end of the fourth capacitor is connected with a second end of the second switching device, and a second end of the fourth capacitor is grounded;
wherein the third and fourth capacitors are together used to control the alternating frequency of the heating current of the heating element.
An embodiment of the present invention further provides a heating circuit, where the heating circuit includes: the power supply comprises an inverter circuit, a first switching device, a second switching device, a heating element, a detection circuit, a first power supply and a second power supply; wherein,
the first switching device includes: a first sub-switching device and a second sub-switching device; the second switching device includes: a third sub-switching device and a third sub-switching device;
a first end of the first sub-switching device is connected with a first end of the heating element, and a second end of the first sub-switching device is connected with a first end of the inverter circuit; a first end of the second sub-switching device is connected with a first end of the heating element, and a second end of the second sub-switching device is connected with a first end of the detection circuit;
the first end of the third sub-switching device is connected with the second end of the heating element, and the second end of the third sub-switching device is connected with the second end of the inverter circuit; a first terminal of the fourth sub-switching device is connected with the second terminal of the heating element, and a second terminal of the fourth sub-switching device is connected with the second terminal of the detection circuit;
if the first sub-switching device is turned on, the second sub-switching device is turned off, the third sub-switching device is turned on, and the fourth switching device is turned off, the first power supply, the inverter circuit and the heating element form a first loop, the first power supply supplies power to the heating element through the first loop, and the heating element generates heat based on the power supply of the first power supply;
if the first sub-switching device is turned off and the second sub-switching device is turned on, and the third sub-switching device is turned off and the fourth switching device is turned on, the second power supply supplies power to the heating element and the detection circuit through the second loop.
In the above scheme, the detection circuit includes: the circuit comprises a first capacitor, a second capacitor and a first resistor;
the first end of the first capacitor is connected with the second power supply, and the second end of the first capacitor is respectively connected with the second end of the second sub-switching device and the first end of the second capacitor;
the second end of the second capacitor is grounded, and is also connected with the first end of the first electron;
a second terminal of the first resistor is connected to a second terminal of the fourth sub-switching device.
The embodiment of the invention provides a heating circuit, which is characterized in that whether a first switch device and a second switch device between an inverter circuit and a heating element are conducted or not is used for realizing the conduction of a first loop formed by connecting a first power supply, the inverter circuit and the heating element or the conduction of a second loop formed by connecting a second power supply, a detection circuit and the heating element; when the first loop is conducted, the second loop is not conducted, and when the second loop is conducted, the first loop is not conducted (namely, the first loop and the second loop are isolated from each other). Therefore, when the second power supply detects the heating element through the second loop, the second power supply is not influenced by the first power supply, and the accuracy of detecting the impedance of the heating element is improved; and when the first power supply heats the heating element through the first loop, the first power supply is not influenced by the second power supply, so that the condition that the current in the heating element is overlarge due to the fact that the second power supply heats the heating element is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of an alternative configuration of a heating circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another alternative heating circuit configuration according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a detection circuit in the heating circuit according to the present invention;
FIG. 4 is a schematic diagram of another detection circuit in the heating circuit according to the present invention;
FIG. 5 is a schematic diagram of a heating circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a heating circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another alternative structure of the heating circuit according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, an embodiment of the present invention provides a heating circuit, including: an inverter circuit 11, a first switching device 12, a heating element 13, a second switching device 14, a detection circuit 15, a first power supply 16, and a second power supply 17; wherein,
a first terminal of the first switching device 12 is connected to a first terminal of the heating element 13, a second terminal of the first switching device 12 is connected to a first terminal of the inverter circuit 11, and a third terminal of the first switching device 12 is connected to a first terminal of the detection circuit 15;
a first terminal of the second switching device 14 is connected to the second terminal of the heating element 13, a second terminal of the second switching device 14 is connected to the second terminal of the inverter circuit 11, and a third terminal of the second switching device 14 is connected to the second terminal of the detection circuit 15;
if the first end of the first switching device 12 is connected to the second end of the first switching device 12, and the first end of the second switching device 14 is connected to the second end of the second switching device 14, the first power source 16, the heating element 13 and the inverter circuit 11 form a first loop, the first power source 16 supplies power to the heating element 13 through the first loop, and the heating element 13 generates heat based on the power supplied by the first power source 16;
if the first terminal of the first switch device 12 is connected to the third terminal of the first switch device 12, and the first terminal of the second switch device 14 is connected to the third terminal of the second switch device 14, the second power supply 17, the detection circuit 15 and the heating element 13 form a second loop, and the second power supply 17 supplies power to the heating element 13 and the detection circuit 15 through the second loop.
In the embodiment of the present invention, the detection circuit 15 detects the impedance of the heating element 13 based on the power supply of the second power supply 17; wherein the detected impedance is used to control the supply of power from the first power source 16 to the heating element 13.
In the embodiment of the present invention, the second terminal of the inverter circuit is connected to a Ground (GND) (not shown in fig. 1).
Wherein the heating element 13 includes, but is not limited to, at least one of: coil, drum, electric heat line, electric heat board, electric heat stick and electric heat piece.
The heating element 13 is, for example, a coil in an electric rice cooker. If the switching device is disconnected, the second power supply is used for heating and supplying power to the heating element and the detection circuit; the detection circuit determines the magnitude of the detection current in the detection circuit or the upper voltage of the detection resistor in the heating circuit based on the power supplied by the second power supply. Determining the impedance on the coil of the electric cooker based on the detection current or the voltage on the detection resistor; determining that a cooking device is on the induction cooker based on the determined impedance; thereby heating the electric rice cooker by the first power supply based on the conduction of the switching device.
Wherein, the heating element 13 can be one or more.
In one embodiment, if there are a plurality of heating elements, the plurality of heating elements are connected in series.
In one embodiment, the first switching device includes: a single pole double throw switch; the second switching device includes: single pole double throw switch.
In another embodiment, the first switching device includes: a single-pole double-throw relay; the second switching device includes: single pole double throw relay. Therefore, in the embodiment of the invention, the selective conduction of the first switching device and the selective conduction of the second switching device can be realized through the single-pole double-throw relay, so that the danger caused by manual selective conduction is greatly reduced.
In the embodiment of the present invention, when the first end of the first switching device is connected to the second end of the first switching device, and the first end of the second switching device is connected to the second end of the second switching device, the first loop is turned on; and when the first end of the first switching device is connected with the third end of the first switching device and the first end of the second switching device is connected with the third end of the second switching device, the second loop is conducted. Therefore, the first loop and the second loop have no electrical connection point, and the first loop and the second loop are isolated from each other and do not influence each other.
Therefore, when the second power supply detects the heating element through the second loop, the heating element is not influenced by the first power supply, and the accuracy of detecting whether the heating element has impedance is improved. And when the first power supply heats the heating element through the first loop, the influence of the second power supply is avoided, so that the influence of overlarge current in the heating element caused by the heating of the heating element by the second power supply is greatly reduced.
In some embodiments, the first power supply 16 is a power supply for obtaining a first voltage, and the second power supply 17 is a power supply for obtaining a second voltage; wherein the first voltage is greater than the second voltage; alternatively, when the first power source 16 supplies power to the heating element through the first loop, the current flowing through the second heating element is a first current;
when the second power supply 17 supplies power to the heating element through the second loop, the current flowing through the heating element is a second current;
wherein the first current is greater than the second current.
In the embodiment of the invention, the first power supply is used for obtaining a power supply larger than or equal to 110V, and the second power supply is used for obtaining a power supply smaller than or equal to 36V.
In one embodiment, the first power supply is used for obtaining 220V direct current voltage; the second power supply is used for obtaining 5V direct current voltage.
It can be understood that, if the voltage obtained by the first power supply is greater than 110V, the voltage obtained by the first power supply is a strong electric voltage; if the voltage acquired by the second power supply is less than 36V, the voltage acquired by the second power supply is weak current voltage; at this time, if the first loop is not isolated from the second loop, the noise of the first loop is interfered to the second loop, thereby detecting the impedance on the heating element. Moreover, when the second circuit detects the impedance of the heating element, the actual voltage of the second circuit may be a strong voltage greater than 110V, which also brings a certain danger to people near the heating circuit.
In the embodiment of the invention, the first loop and the second loop can be thoroughly disconnected through the first switching device and the second switching device, so that the isolation of strong current and weak current can be realized, the influence of noise crosstalk of the strong current circuit (namely the first loop) on the weak current circuit (namely the second loop) is greatly reduced, and the danger caused by the low insulating property of the weak current circuit is reduced.
As shown in fig. 2, in some embodiments, the heating circuit comprises: a first control circuit 18 and a second control circuit 19;
the first control circuit 18 is connected to the first switching device 12, and configured to send a first control signal for turning on a first terminal of the first switching device 12 and a second terminal of the first switching device 12, or send a second control signal for turning on the first terminal of the first switching device 12 and a third terminal of the first switching device 12;
the second control circuit 19 is connected to the second switching device 14, and configured to send a third control signal for turning on the first terminal of the second switching device 14 and the second terminal of the second switching device 14, or send a fourth control signal for turning on the first terminal of the second switching device 14 and the third terminal of the second switching device 14.
In the embodiment of the present invention, both the first control signal and the third control signal may be high level signals; the second control signal and the fourth control signal may each be a low level signal. In all embodiments of the present invention, the high level signal and the low level signal are relative terms, and under the same reference standard, the voltage of the high level is greater than that of the low level.
In the embodiment of the present invention, the first control circuit 18 may be a control circuit having a signal processing capability; the second control circuit 19 may be a control circuit with signal processing capabilities.
In the embodiment of the present invention, the first control circuit 18 may include a control chip or a controller; the second control circuit 19 may comprise a control chip or controller. The control chip can be: a processing chip of a central processing unit, a microcontroller chip, a data signal processing chip or a programmable array processing chip, etc. The control chip can be: a processing chip of a central processing unit, a microcontroller chip, a data signal processing chip or a programmable array processing chip, etc.
In the embodiment of the present invention, a control signal may be sent to the first switching device through a first control circuit to selectively turn on the first terminal and the second terminal of the first switching device, or turn on the first terminal and the third terminal of the first switching device; sending a control signal to the second switching device through a second control circuit so as to selectively conduct a first end and a second end of the second switching device or conduct a first end and a third end of the second switching device; so, need not the manpower and go selecting switching on of first switching device and second switching device to can greatly reduced if first power or second power are greater than when 36V, go to switch the danger that first switching device and second switching device brought through the manpower.
In other embodiments, as shown in fig. 3, the detection circuit 15 includes: the MOS transistor comprises a first MOS transistor (MOSFET1), a second MOS transistor (MOSFET2) and a first resistor R1;
the drain electrode of the first MOS transistor is connected with the second power supply 17, and the source electrode of the first MOS transistor is respectively connected with the drain electrode of the second MOS transistor and the third end of the first switching device 12;
the source electrode of the second MOS tube is grounded, and the source electrode of the second MOS tube is also connected with the first end of the first resistor R1;
a second terminal of the first resistor R1 is connected to a third terminal of the first switching device 14.
Here, each of the first and second MOS transistors may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).
It is understood that, in the embodiment of the present invention, the pulse voltage may be provided to the heating element according to the disconnection or conduction of the first MOS transistor and the second MOS transistor. Here, the pulse voltages with different frequencies can be provided by controlling the time interval of turning off and on the first MOS transistor and the second MOS transistor.
Here, if the first MOS transistor is an N-channel MOS transistor, the second MOS transistor is an N-channel MOS transistor; if the first MOS tube is a P-channel type MOS tube, the second MOS tube is a P-channel type MOS tube. For example, as shown in fig. 3, the first MOS transistor and the second MOS transistor are both N-channel MOS transistors.
In one embodiment, the second power supply is a power supply for providing or obtaining 3.3V dc voltage.
In the embodiment of the invention, a second power supply supplies low-voltage high-frequency pulse waves to the heating element through the first MOS tube and the second MOS tube. Thus, if no cooking equipment exists on the heating element, the detection current flowing through the first resistor is a first current value; if cooking equipment exists on the heating element, the detection current flowing through the first resistor is a second current value; therefore, the current of the first resistor is detected by the current meter, and whether the cooking device with certain resistance exists on the heating element or not is determined.
Alternatively, the presence or absence of an impedance on the heating element (other than the impedance of the heating element itself), for example the impedance of the cooking appliance, may cause a change in the current flowing through the first resistor, which changes the voltage across the first resistor, and the presence or absence of an impedance on the heating element may also be determined by measuring the voltage across the first resistor R1.
It should be noted that, in all embodiments of the present invention, the high frequency and the low frequency are relative, and under the same reference standard, the frequency of the high frequency is greater than that of the low frequency. In some embodiments, the high frequency is a frequency greater than 50 Hz.
In some embodiments, if the detection circuit comprises: the second power supply is used for supplying a third voltage; the first end of the first capacitor is connected with the second power supply, and the second end of the first capacitor is connected with the first end of the second capacitor; the second end of the second capacitor is grounded;
if the detection circuit comprises: the second power supply is used for providing fourth voltage; the drain electrode of the first MOS tube is connected with the second power supply, and the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube; the source electrode of the second MOS tube is grounded;
wherein the third voltage is greater than the fourth voltage.
In the embodiment of the invention, when the pulse wave is provided based on the two capacitors in the detection circuit, the voltage value obtained or provided by the second power supply is relatively higher than that when the pulse wave is provided based on the two MOS transistors; thus, the accuracy of the detection circuit for detecting the impedance of the heating element based on the two capacitors is improved.
As shown in fig. 4, in some embodiments, the detection circuit 15 further includes: a first capacitor C1, a second capacitor C2 and a second resistor R1;
a first terminal of the first capacitor C1 is connected to the second power supply 17, and a second terminal of the first capacitor C1 is connected to a first terminal of the second capacitor C2 and a third terminal of the first switching device 12, respectively;
a second end of the second capacitor C2 is grounded DGND, and a second end of the second capacitor C2 is further connected with a first end of the second resistor R2;
a second terminal of the second resistor R2 is connected to a third terminal of the second switching device 14.
In one embodiment, the detection circuit shown in fig. 4 includes a first resistor R1; the first resistor R1 is connected between the second resistor R2 and a second capacitor C2.
In one embodiment, the second power supply is a power supply for supplying or obtaining 5V dc voltage.
In the embodiment of the invention, a second power supply can provide low-voltage high-frequency pulse waves to the heating element through the first MOS tube and the second MOS tube; also, the impedance of the heating element may be matched by the first capacitance C1 and the second capacitance. Thus, if no cooking device is present on the heating element 13, the detection current flowing through the second resistor is a first current value; if the heating element is provided with the cooking equipment, the detection current flowing through the second resistor is a second current value; therefore, whether the cooking device with certain impedance exists on the heating element can be determined by detecting the current of the second resistor through the current meter or detecting the voltage across the second resistor through the voltage meter.
In the embodiment of the present invention, as shown in fig. 4, since the first end of the second resistor R1 is grounded, a voltage of 0 is applied to the first end of the second resistor. In this way, the voltage across the second resistor can be calculated by detecting only the potential of the second end of the second resistor (for example, by providing a voltage sensor at the second end of the second resistor to detect the potential of the second end of the second resistor). Thus, the embodiment of the invention can also simplify the operation of measuring the voltage across the second resistor.
As shown in fig. 5, in some embodiments, the inverter circuit 11 includes: a first IGBT (IGBT1) and a second IGBT (IGBT 2);
the collector of the first IGBT is connected with the first power supply 16, and the emitter of the first IGBT is connected with the collector of the second IGBT; the emitter of the second IGBT is grounded;
a first terminal of the first switching device K1 is connected to the emitter of the first IGBT, and a second terminal of the second switching device K2 is connected to the collector of the first IGBT.
Here, the first switching device K1 is the first switching device 12 in the above embodiment; the second switching device K2 is the second switching device 14 in the above embodiment.
Here, an Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power semiconductor device composed of a BJT (Bipolar Transistor) and a MOS (Insulated Gate field effect Transistor).
In one embodiment, the first power source is used for obtaining 220V direct current voltage. The 220V dc voltage passes through the inverter circuit 11, and then outputs 220V ac voltage.
In another embodiment, the first power supply is used for obtaining 220V alternating voltage, and the 220V alternating voltage is only alternating voltage with positive phase voltage (positive half wave). After the voltage obtained by the first power supply passes through the inverter circuit 11, an alternating voltage having positive and negative phases is output.
In yet another embodiment, the first power supply is used to obtain an alternating voltage of 220V (mains). A rectifying circuit is further provided between the first power supply 16 and the inverter circuit 11, and converts a 220V ac voltage into a 220V dc voltage; the inverter circuit 11 converts the 220V dc voltage into a 220V ac voltage.
Wherein, the ac power source includes but is not limited to one of the following: sine wave AC power supply, square wave AC power supply.
In the embodiment of the present invention, the signal frequency of the first power supply may be adjusted by the on and off frequencies of the first IGBT and the second IGBT. In this way, the first power source can be converted into a high-frequency pulse wave through the inverter circuit formed by the first IGBT and the second IGBT, so as to supply power to the heating element. And because the inverter circuit adopts the IGBT, the inverter circuit has the advantages of high input impedance of the MOS tube and low conduction voltage drop of the power transistor. Therefore, the embodiment of the invention can improve the stability and the safe working voltage area of power supply for the heating element, thereby improving the safety of power supply for the heating element.
In other embodiments, the inverter circuit 11 includes: a third MOS transistor (MOSFET3) and a fourth MOS transistor (MOSFET 4);
the drain of the third MOS transistor is connected to the first power supply 16, and the source of the third MOS transistor is connected to the drain of the fourth MOS transistor; the source electrode of the fourth MOS tube is grounded PGND;
the first end of the first switching device K1 is connected with the source electrode of the third MOS tube, and the second end of the second switching device K2 is connected with the drain electrode of the third MOS tube.
Here, if the third MOS transistor is an N-channel MOS transistor, the fourth MOS transistor is an N-channel MOS transistor; if the third MOS tube is a P-channel MOS tube, the fourth MOS tube is a P-channel MOS tube.
In the embodiment of the invention, the heating element can be provided with high-frequency pulse waves by the alternate conduction of the third MOS tube and the fourth MOS tube.
As shown in fig. 6, in some embodiments, the detection circuit further includes: a fifth capacitance C5;
wherein a first end of the fifth capacitor C5 is connected with a second end of the second resistor R2; the second terminal of the fifth capacitor C5 is connected to the third terminal of the second switching device K2.
Here, the second switching device K2 is the second switching device 14 in the above embodiment.
In an embodiment of the present invention, the fifth capacitor C5 is a matching capacitor of the heating element. Here, the oscillation frequency by the heating element in the second circuit can be adjusted by adjusting the capacitive reactance of the fifth capacitor, the impedance of the heating element, the impedance of the second resistor, and the like; thereby improving the accuracy of detecting the presence of resistance in the heating element.
Referring again to fig. 6, in some embodiments, the heating circuit further includes: a third capacitance C3 and a fourth capacitance C4; wherein,
the third capacitor C3 is connected between the first power supply 16 and the second terminal of the second switching device K2;
a first end of the fourth capacitor C4 is connected with a second end of the second switching device K2, and a second end of the fourth capacitor C4 is grounded;
wherein the third capacitor C3 and the fourth capacitor C4 are used together for controlling the alternating frequency of the heating current of the heating element L1.
Here, the heating element L1 is the heating element 13 in the above embodiment.
In the embodiment of the present invention, the third capacitor C3 and the fourth capacitor C4 are matching capacitors of the heating element L1. Here, the oscillation frequency (i.e., the alternating frequency) of the heating element in the first circuit may be adjusted by adjusting the capacitive reactance of the third and fourth capacitors, and the impedance of the heating element.
In an embodiment of the invention, the alternating frequency of the heating element in the first loop may be determined by the second capacitance and the third capacitance, such that the heating element operates at a suitable alternating frequency and has a suitable heating current.
Example 1
Referring to fig. 5 again, an embodiment of the invention provides a heating circuit, including:
the detection circuit comprises an inverter circuit 11, a first switching device K1, a heating element L1, a second switching device K2, a detection circuit 15, a first power supply 16, a second power supply 17, a third capacitor C3 and a fourth capacitor C4; wherein, the inverter circuit 11 includes: a first IGBT (IGBT1) and a second IGBT (IGBT 2);
the detection circuit includes: the circuit comprises a first capacitor C1, a second capacitor C2, a first resistor R1, a first MOS (MOSFET1) and a second MOS (MOSFET 2);
a first terminal of the first switching device K1 is connected with a first terminal of the heating element L1, a second terminal of the first switching device K1 is connected with the first IGBT emitter, and a third terminal of the first switching device K1 is connected with a second terminal of the first capacitor C1;
a first terminal of the second switching device K2 is connected to the second terminal of the heating element L1, a second terminal of the second switching device K2 is connected to the collector of the first IGBT, and a third terminal of the second switching device K2 is connected to the second terminal of the first resistor R1;
the collector of the first IGBT is also connected to the first power supply 16; the emitter of the second IGBT is also grounded PGND;
a first end of the first capacitor C1 is connected with the second power supply 17, and a second end of the first capacitor C1 is connected with a first end of the second capacitor C2; a second end of the second capacitor C2 is connected to the first resistor R1 and the ground point DGND, respectively;
the drain electrode of the first MOS tube is connected with the second power supply 17, and the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube; the drain electrode of the second MOS tube is connected with a second switching device, and the source electrode of the second MOS tube is connected with the second end of the first resistor R1;
if the first terminal of the first switching device K1 is connected to the second terminal of the first switching device K1, and the first terminal of the second switching device K2 is connected to the second terminal of the second switching device K2, the first power source 16, the heating element L1 and the inverter circuit 11 form a first loop, the first power source 16 supplies power to the heating element L1 through the first loop, and the heating element L1 generates heat based on the power supplied by the first power source 16;
if the first terminal of the first switching device K1 is connected to the third terminal of the first switching device K1, and the first terminal of the second switching device K2 is connected to the third terminal of the second switching device K2, the second power supply 17, the detection circuit 15 and the heating element L1 form a second loop, and the second power supply 17 supplies power to the heating element L1 and the detection circuit 15 through the second loop; wherein the detection circuit 15 detects the impedance of the heating element L1 based on the power supply of the second power supply 17; wherein the detected impedance is used to control the power supplied by the first power supply 16 to the heating element L2.
In an embodiment of the present invention, the first circuit and the second circuit have no electrical connection point, and the first circuit and the second circuit are isolated from each other and do not affect each other. When the second power supply detects the heating element through the second loop, the heating element is not influenced by the first power supply, and the accuracy of detecting whether the heating element has impedance is improved; and when the first power supply heats the heating element through the first loop, the first power supply is not influenced by the second power supply, so that the influence of overlarge current in the heating element caused by the heating of the heating element by the second power supply is greatly reduced.
Example two
As shown in fig. 6, an embodiment of the present invention provides a heating circuit, including:
the detection circuit comprises an inverter circuit 11, a first switching device K1, a heating element L1, a second switching device K2, a detection circuit 15, a first power supply 16, a second power supply 17, a third capacitor C3 and a fourth capacitor C4; wherein,
the inverter circuit 11 includes: a first IGBT (IGBT1) and a second IGBT (IGBT 2);
the detection circuit includes: the first MOS transistor (MOSFET1), the second MOS transistor (MOSFET2), the second resistor R2 and the fifth capacitor C5;
a first terminal of the first switching device K1 is connected with a first terminal of the heating element L1, a second terminal of the first switching device K1 is connected with the first IGBT emitter, and a third terminal of the first switching device K1 is connected with the source of the first MOS transistor;
a first terminal of the second switching device K2 is connected to the second terminal of the heating element L1, a second terminal of the second switching device K2 is connected to the collector of the first IGBT, and a third terminal of the second switching device K2 is connected to the second terminal of the fifth capacitor C5;
the collector of the first IGBT is also connected to the first power supply 16; the emitter of the second IGBT is also grounded PGND;
the drain electrode of the first MOS tube is connected with the second power supply 17, and the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube; the source electrode of the second MOS tube is respectively connected with the first end of the second resistor R2 and a grounding point DGND; a first end of the second resistor R2 is connected with a first end of the fifth capacitor C5;
if the first terminal of the first switching device K1 is connected to the second terminal of the first switching device K1, and the first terminal of the second switching device K2 is connected to the second terminal of the second switching device K2, the first power source 16, the heating element L1 and the inverter circuit 11 form a first loop, the first power source 16 supplies power to the heating element L1 through the first loop, and the heating element L1 generates heat based on the power supplied by the first power source 16;
if the first terminal of the first switching device K1 is connected to the third terminal of the first switching device K1, and the first terminal of the second switching device K2 is connected to the third terminal of the second switching device K2, the second power supply 17, the detection circuit 15 and the heating element L1 form a second loop, and the second power supply 17 supplies power to the heating element L1 and the detection circuit 15 through the second loop; wherein the detection circuit 15 detects the impedance of the heating element L1 based on the power supply of the second power supply 17; wherein the detected impedance is used to control the power supplied by the first power supply 16 to the heating element L2.
In an embodiment of the present invention, the first circuit and the second circuit have no electrical connection point, and the first circuit and the second circuit are isolated from each other and do not affect each other. When the second power supply detects the heating element through the second loop, the heating element is not influenced by the first power supply, so that the accuracy of detecting whether the resistance exists in the heating element is improved; and when the first power supply heats the heating element through the first loop, the first power supply is not influenced by the second power supply, so that the influence of overlarge current in the heating element caused by the heating of the heating element by the second power supply is greatly reduced.
As shown in fig. 7, an embodiment of the present invention further provides a heating circuit, where the heating circuit includes: an inverter circuit 11, a first switching device 12, a heating element 13, a second switching device 14, and a detection circuit 15, a first power supply 16, and a second power supply 17; wherein,
the first switching device 12 includes: a first sub-switching device 121 and a second sub-switching device 122; the second switching device 14 includes: a third sub-switching device 141 and a third sub-switching device 142;
a first terminal of the first sub-switching device 121 is connected to a first terminal of the heating element 13, and a second terminal of the first sub-switching device 121 is connected to a first terminal of the inverter circuit 11; a first terminal of the second sub-switching device 122 is connected to a first terminal of the heating element 13, and a second terminal of the second sub-switching device 122 is connected to a first terminal of the detection circuit 15;
a first terminal of the third sub-switching device 141 is connected to the second terminal of the heating element 13, and a second terminal of the third sub-switching device 141 is connected to the second terminal of the inverter circuit 11; a first terminal of the fourth sub-switching device 142 is connected to the second terminal of the heating element 13, and a second terminal of the fourth sub-switching device 142 is connected to the second terminal of the detection circuit 15;
if the first sub-switching device 121 is turned on, the second sub-switching device 122 is turned off, the third sub-switching device 141 is turned on, and the fourth switching device 142 is turned off, the first power supply 16, the inverter circuit 11, and the heating element 13 form a first loop, the first power supply 16 supplies power to the heating element 13 through the first loop, and the heating element 13 generates heat based on the power supplied by the first power supply 16;
if the first sub-switching device 121 is turned off and the second sub-switching device 122 is turned on, the third sub-switching device 141 is turned off and the fourth switching device 142 is turned on, the second power supply 17 supplies power to the heating element 13 and the detection circuit 15 through the second loop.
In the embodiment of the present invention, the detection circuit 15 detects the impedance of the heating element 13 based on the power supply of the second power supply 17; wherein the detected impedance is used to control the supply of power from the first power source 16 to the heating element 13.
In the embodiment of the present invention, the first sub-switching device, the second sub-switching device, the third sub-switching device and the fourth sub-switching device may be single-pole single-throw switches; alternatively, the first sub-switching device, the second sub-switching device, the third sub-switching device and the fourth sub-switching device may be single-pole single-throw relays.
In the embodiment of the present invention, if the first sub-switching device is turned on and the second sub-switching device is turned off, and the third sub-switching device is turned on and the fourth switching device is turned off, the first loop is turned on; if the first sub-switching device is turned off and the second sub-switching device is turned on, and the third sub-switching device is turned off and the fourth switching device is turned on, the second loop is turned on; therefore, the first loop and the second loop have no electrical connection point, and the first loop and the second loop are isolated from each other and do not influence each other.
Therefore, when the second power supply detects the heating element through the second loop, the heating element is not influenced by the first power supply, and the accuracy of detecting whether the heating element has impedance is improved; and when the first power supply heats the heating element through the first loop, the first power supply is not influenced by the second power supply, so that the influence of overlarge current in the heating element caused by the heating of the heating element by the second power supply is greatly reduced.
It is understood that, in the embodiment of the present invention, the single-pole single-throw first sub-switching device and the single-pole single-throw second sub-switching device are used to replace the single-pole double-throw first switching device in fig. 1, and the single-pole single-throw third sub-switching device and the single-pole single-throw fourth sub-switching device are used to replace the single-pole double-throw second switching device in fig. 1. As such, based on the description of the detection circuit, the inverter circuit, and the like in the heating circuit according to the embodiment of the present invention, similar to the description of the detection circuit, the inverter circuit, and the like corresponding to the heating circuit in fig. 1 to 6, only the connection relationship of the switching devices is changed (for example, the first terminal of the first sub-switching device and the first terminal of the second sub-switching device in the embodiment shown in fig. 7 may correspond to the second terminal of the first switching device in any one of fig. 1 to 6, the second terminal of the first sub-switching device in the embodiment shown in fig. 7 may correspond to the second terminal of the first switching device in any one of fig. 1 to 6, the second terminal of the second sub-switching device in the embodiment shown in fig. 7 may correspond to the third terminal of the first switching device in any one of fig. 1 to 6, the first terminal of the third sub-switching device and the first terminal of the fourth sub-switching device in the embodiment shown in fig. 7, may correspond to the second terminal of the second switching device in any of the embodiments of fig. 1-6; the second terminal of the third sub-switching device in the embodiment shown in fig. 7 may be equivalent to the second terminal of the second switching device in any one of the embodiments of fig. 1 to 6; the second terminal of the fourth sub-switching device in the embodiment shown in fig. 7 may be equivalent to the third terminal of the second switching device in any one of fig. 1 to 6).
For example, in some embodiments, the detection circuit comprises: a first capacitor C1, a second capacitor C2 and a second resistor R1;
a first terminal of the first capacitor C1 is connected to the second power supply 16, and a second terminal of the first capacitor C1 is connected to a second terminal of the second sub-switching device 121 and a first terminal of the second capacitor C2, respectively;
the second end of the second capacitor C2 is grounded, and the second end of the second capacitor C2 is also connected with the first end of the second resistor R1;
a second terminal of the second resistor R2 is connected to a second terminal of the fourth sub-switching device 142.
As another example, in other embodiments, the detection circuit includes: the MOS transistor comprises a first MOS transistor (MOSFET1), a second MOS transistor (MOSFET2) and a second resistor R2;
the drain of the first MOS transistor is connected to the second power supply 16, and the source of the first MOS transistor is connected to the drain of the second MOS transistor and the second end of the second sub-switching device 122, respectively;
the source electrode of the second MOS tube is grounded, and the source electrode of the second MOS tube is also connected with the first end of the second resistor;
a second terminal of the second resistor is connected to a second terminal of the fourth sub-switching device 142.
Similar to the above description of the advantageous effects of the detection circuit, the inverter circuit, and the like corresponding to the heating circuit in fig. 1 to 6, are not repeated. For the embodiments of the present invention based on technical details not disclosed in the embodiments of the detection circuit, the inverter circuit, and the like in the heating circuit, please refer to the description of the embodiments of the detection circuit, the inverter circuit, and the like corresponding to the heating circuit.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A heating circuit, characterized in that the heating circuit comprises: the power supply comprises an inverter circuit, a first switching device, a second switching device, a heating element, a detection circuit, a first power supply and a second power supply; wherein,
a first end of the first switching device is connected with a first end of the heating element, a second end of the first switching device is connected with a first end of the inverter circuit, and a third end of the first switching device is connected with a first end of the detection circuit;
a first end of the second switching device is connected with a second end of the heating element, a second end of the second switching device is connected with a second end of the inverter circuit, and a third end of the second switching device is connected with a second end of the detection circuit;
if the first end of the first switching device is conducted with the second end of the first switching device and the first end of the second switching device is conducted with the second end of the second switching device, the first power supply, the heating element and the inverter circuit form a first loop, the first power supply supplies power to the heating element through the first loop, and the heating element generates heat based on the power supply of the first power supply; the voltage acquired by the first power supply is a strong voltage;
if the first terminal of the first switching device is conducted with the third terminal of the first switching device and the first terminal of the second switching device is conducted with the third terminal of the second switching device, the second power supply, the detection circuit and the heating element form a second loop, and the second power supply supplies power to the heating element and the detection circuit through the second loop; the voltage obtained by the second power supply is weak current voltage.
2. The heating circuit according to claim 1, wherein the first power supply is a power supply for obtaining a first voltage, and the second power supply is a power supply for obtaining a second voltage; wherein the first voltage is greater than the second voltage;
or,
when the first power supply supplies power to the heating element through the first loop, the current flowing through the heating element is a first current;
when the second power supply supplies power to the heating element through the second loop, the current flowing through the heating element is a second current;
wherein the first current is greater than the second current.
3. The heating circuit of claim 1, wherein the heating circuit comprises: a first control circuit and a second control circuit;
the first control circuit is connected with the first switching device and is used for sending a first control signal for conducting a first end of the first switching device and a second end of the first switching device, or sending a second control signal for conducting the first end of the first switching device and a third end of the first switching device;
the second control circuit is connected to the second switching device and configured to send a third control signal for turning on the first end of the second switching device and the second end of the second switching device, or send a fourth control signal for turning on the first end of the second switching device and the third end of the second switching device.
4. The heating circuit of claim 1, wherein the first switching device comprises: a single pole double throw relay, the second switching device comprising: single pole double throw relay.
5. The heating circuit of claim 1, wherein the detection circuit comprises: the MOS transistor comprises a first MOS transistor, a second MOS transistor and a first resistor;
the drain electrode of the first MOS tube is connected with the second power supply, and the source electrode of the first MOS tube is respectively connected with the drain electrode of the second MOS tube and the third end of the first switching device;
the source electrode of the second MOS tube is grounded, and the source electrode of the second MOS tube is also connected with the first end of the first resistor;
and the second end of the first resistor is connected with the third end of the second switching device.
6. The heating circuit of claim 1, wherein the detection circuit comprises: a first capacitor, a second capacitor and a second resistor;
the first end of the first capacitor is connected with the second power supply, and the second end of the first capacitor is respectively connected with the first end of the second capacitor and the third end of the first switching device;
the second end of the second capacitor is grounded, and the second end of the second capacitor is also connected with the first end of the second resistor;
and the second end of the second resistor is connected with the third end of the second switching device.
7. The heating circuit of claim 1, wherein the inverter circuit comprises: a first IGBT and a second IGBT;
the collector of the first IGBT is connected with the first power supply, and the emitter of the first IGBT is connected with the collector of the second IGBT; the emitter of the second IGBT is grounded;
the first end of the first switching device is connected with the emitter of the first IGBT, and the second end of the second switching device is connected with the collector of the first IGBT.
8. The heating circuit of claim 1, further comprising: a third capacitor and a fourth capacitor; wherein,
the third capacitor is connected between the first power supply and the second end of the second switching device;
a first end of the fourth capacitor is connected with a second end of the second switching device, and a second end of the fourth capacitor is grounded;
wherein the third and fourth capacitors are together used to control the alternating frequency of the heating current of the heating element.
9. A heating circuit, characterized in that the heating circuit comprises: the power supply comprises an inverter circuit, a first switching device, a second switching device, a heating element, a detection circuit, a first power supply and a second power supply; wherein,
the first switching device includes: a first sub-switching device and a second sub-switching device; the second switching device includes: a third sub-switching device and a fourth sub-switching device;
a first end of the first sub-switching device is connected with a first end of the heating element, and a second end of the first sub-switching device is connected with a first end of the inverter circuit; a first end of the second sub-switching device is connected with a first end of the heating element, and a second end of the second sub-switching device is connected with a first end of the detection circuit;
the first end of the third sub-switching device is connected with the second end of the heating element, and the second end of the third sub-switching device is connected with the second end of the inverter circuit; a first terminal of the fourth sub-switching device is connected with the second terminal of the heating element, and a second terminal of the fourth sub-switching device is connected with the second terminal of the detection circuit;
if the first sub-switching device is turned on, the second sub-switching device is turned off, the third sub-switching device is turned on, and the fourth sub-switching device is turned off, the first power supply, the inverter circuit and the heating element form a first loop, the first power supply supplies power to the heating element through the first loop, and the heating element generates heat based on the power supplied by the first power supply; the voltage acquired by the first power supply is a strong voltage;
if the first sub-switching device is turned off and the second sub-switching device is turned on, and the third sub-switching device is turned off and the fourth sub-switching device is turned on, the second power supply supplies power to the heating element and the detection circuit through a second loop; the voltage obtained by the second power supply is weak current voltage.
10. The heating circuit of claim 9, wherein the detection circuit comprises: the circuit comprises a first capacitor, a second capacitor and a first resistor;
a first end of the first capacitor is connected with the second power supply, and a second end of the first capacitor is respectively connected with a second end of the second sub-switch device and a first end of the second capacitor;
the second end of the second capacitor is grounded, and the second end of the second capacitor is also connected with the first end of the first resistor;
a second terminal of the first resistor is connected to a second terminal of the fourth sub-switching device.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911417898.1A CN113133138B (en) | 2019-12-31 | 2019-12-31 | Heating circuit |
| EP20909801.1A EP4068903A4 (en) | 2019-12-31 | 2020-12-29 | Heating circuit |
| PCT/CN2020/141094 WO2021136306A1 (en) | 2019-12-31 | 2020-12-29 | Heating circuit |
| JP2022540723A JP7424683B2 (en) | 2019-12-31 | 2020-12-29 | heating circuit |
| US17/843,903 US20220361299A1 (en) | 2019-12-31 | 2022-06-17 | Heating Circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911417898.1A CN113133138B (en) | 2019-12-31 | 2019-12-31 | Heating circuit |
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| CN113133138A CN113133138A (en) | 2021-07-16 |
| CN113133138B true CN113133138B (en) | 2022-09-30 |
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| CN113133138A (en) | 2021-07-16 |
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