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CN111458542B - Circuit and method for processing constant current source output voltage convex wave - Google Patents

Circuit and method for processing constant current source output voltage convex wave Download PDF

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Publication number
CN111458542B
CN111458542B CN202010258146.1A CN202010258146A CN111458542B CN 111458542 B CN111458542 B CN 111458542B CN 202010258146 A CN202010258146 A CN 202010258146A CN 111458542 B CN111458542 B CN 111458542B
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voltage
circuit
current
control circuit
output
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CN111458542A (en
Inventor
李有财
邓秉杰
林德超
吴煌麒
陈兴
陈言祥
邱子凡
杨耀荣
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Fujian Nebula Electronics Co Ltd
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Fujian Nebula Electronics Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • 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
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • 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
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dc-Dc Converters (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

The invention provides a processing circuit and a processing method of a constant current source output voltage convex wave, wherein the processing circuit comprises a main control circuit, a front-end switching power supply BACK circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a current acquisition and processing circuit and a front-end voltage output adjusting circuit; the main control circuit is respectively connected with the front-end switching power supply BACK circuit, the constant voltage and constant current control circuit, the voltage and current acquisition circuit and the current acquisition processing circuit; the front-end voltage output adjusting circuit is respectively connected with the linear adjusting control circuit, the front-end switching power supply BACK circuit and the current collecting and processing circuit; the voltage and current acquisition circuit is respectively connected with the constant voltage and constant current control circuit and the current acquisition and processing circuit; the constant voltage and constant current control circuit is connected with the linear regulation control circuit. The invention can effectively solve the problem of output voltage convex wave caused by instantaneous runaway of the whole circuit due to instantaneous current turn-off caused by the disconnection of the output circuit.

Description

Circuit and method for processing constant current source output voltage convex wave
Technical Field
The invention relates to the field of lithium battery pack testing, in particular to a processing circuit and a processing method for constant current source output voltage convex waves.
Background
In the production process of the finished product of the lithium battery pack and the protective plate thereof, the charging overcurrent protection of the finished product of the lithium battery pack and the protective plate thereof are comprehensively tested. With the control of the cost by manufacturers, the voltage withstand value floating space of the finished product of the lithium battery pack and related devices used in the protection plate of the finished product is very small; when the charging overcurrent protection is tested, the output circuit is disconnected to enable the current to be turned off instantaneously, the whole circuit is out of control instantaneously to cause output voltage convex waves, the voltage convex waves cannot exceed the withstand voltage value of related devices in the finished product of the lithium battery pack and the protection board thereof, and the related devices are damaged otherwise.
In the prior art, the following two voltage convex wave processing methods mainly exist at present: the first is that the impedance of the output wiring is required to be reduced to a certain value, and the output value can be set to be smaller by adjusting the front end voltage of the constant current source, so that when the output peripheral loop of the constant current source is instantaneously disconnected, the voltage convex wave caused by the instantaneous disconnection is relatively smaller; however, the adoption of the method for reducing the impedance of the output wiring is a treatment method for treating the symptoms and not the root causes, and the method can only be based on setting the low point of the front-end voltage, so that the output voltage convex wave is reduced to the maximum extent and does not exceed the requirement. The second is to adjust the regulation characteristic and the off output index of the feedback circuit, sacrifice the response time characteristic of the loop, and limit the voltage convex wave after the charge overcurrent protection as much as possible; however, adjusting the adjustment characteristic of the feedback circuit is to sacrifice the corresponding time of the overall feedback circuit to slow down the rising time of the voltage convex wave, and when the feedback circuit is turned off rapidly, the overall usability of the circuit is limited, which is not suitable for some fields requiring rapid protection. Therefore, it is needed to provide a voltage bump processing scheme to effectively solve the problem that the output voltage bump is damaged due to the instantaneous runaway of the whole circuit caused by the instantaneous turn-off of the current due to the disconnection of the output circuit.
Disclosure of Invention
The invention aims to solve the technical problem of providing a processing circuit of a constant current source output voltage convex wave and a processing method thereof, which are used for effectively solving the problem that the output voltage convex wave is caused by instantaneous runaway of the whole circuit and related devices are damaged due to instantaneous turn-off of current caused by the disconnection of an output loop.
The invention is realized in the following way: the processing circuit comprises a main control circuit, a front-end switching power supply BACK circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a current acquisition and processing circuit and a front-end voltage output adjusting circuit;
The main control circuit is connected with the front-end switching power supply BACK circuit, and the front-end switching power supply BACK circuit is connected with the front-end voltage output adjusting circuit; the constant voltage and constant current control circuit is connected with the main control circuit; the linear regulation control circuit is connected with the constant voltage and constant current control circuit; the voltage and current acquisition circuit is respectively connected with the main control circuit, the constant voltage and constant current control circuit and the current acquisition and processing circuit; the current acquisition processing circuit is respectively connected with the main control circuit and the front-end voltage output adjusting circuit; the front-end voltage output adjusting circuit is connected with the linear adjusting control circuit;
When overcurrent protection test is carried out, a test load is respectively connected with the linear regulation control circuit and the voltage and current acquisition circuit;
When the device works, the main control circuit controls the power supply output of the front-end switch power supply BACK circuit and the driving level output of the constant voltage and constant current control circuit; the current acquisition processing circuit and the front-end voltage output adjusting circuit control the output of the front-end voltage; the front-end voltage output adjusting circuit and the constant voltage and constant current control circuit control the linear adjustment output of the linear adjustment control circuit together; the voltage and current acquisition circuit acquires the voltage and current value on the loop in real time; the voltage and current acquisition circuit provides the acquired voltage and current values for the main control circuit to perform real-time monitoring processing, the voltage and current acquisition circuit provides the acquired voltage and current values for the constant voltage and constant current control circuit to perform real-time feedback adjustment and output high-level driving for the main control circuit, and the voltage and current acquisition circuit provides the acquired current values for the current acquisition processing circuit to perform real-time comparison processing; and the current acquisition processing circuit provides the output level for the main control circuit to perform real-time monitoring processing.
Further, the front-end switching power supply BACK circuit comprises a driver, an isolation driving inductor, a first MOS tube, a second MOS tube and an energy storage inductor;
The input end of the driver is connected with the main control circuit, and the input end of the isolation driving inductor is connected with the output end of the driver; the isolation driving inductor is provided with two paths of outputs, one path of output is respectively connected with the G pole and the S pole of the first MOS tube, the D pole of the first MOS tube is connected with a power supply, the other path of output is respectively connected with the G pole and the S pole of the second MOS tube, and the S pole of the second MOS tube is grounded; the S pole of the first MOS tube and the D pole of the second MOS tube are both connected with the input end of the energy storage inductor, and the output end of the energy storage inductor is connected with the front-end voltage output adjusting circuit.
Further, the front-end voltage output adjusting circuit comprises a first capacitor, a third MOS tube, a fourth MOS tube, a first resistor and a second resistor;
One end of the first capacitor is connected with the current acquisition and processing circuit, and the other end of the first capacitor is connected with the G pole of the third MOS tube; the D pole of the third MOS tube is connected with the G pole of the fourth MOS tube; the front-end switching power supply BACK circuit is connected with the D electrode of the fourth MOS tube, and the D electrode of the fourth MOS tube is connected with the S electrode of the fourth MOS tube through the first resistor; one end of the second resistor is connected with the S electrode of the fourth MOS tube, and the other end of the second resistor is grounded together with the S electrode of the third MOS tube.
Further, the constant voltage and constant current control circuit comprises a voltage operational amplifier, a current operational amplifier, a first diode and a second diode;
The positive input ends of the voltage operational amplifier and the current operational amplifier are connected with the main control circuit; the negative input ends of the voltage operational amplifier and the current operational amplifier are connected with the voltage and current acquisition circuit; the output ends of the voltage operational amplifier and the current operational amplifier are connected with the linear regulation control circuit; the first diode is connected in parallel with the output end of the current operational amplifier, and the second diode is connected in parallel with the output end of the voltage operational amplifier.
Further, the linear adjustment control circuit comprises a fifth MOS tube and a third resistor;
the G pole of the fifth MOS tube is connected with the constant voltage and constant current control circuit, and the D pole of the fifth MOS tube is connected with the front-end voltage output adjusting circuit; the S pole of the fifth MOS tube is connected with the positive voltage sampling end of the voltage and current acquisition circuit; one end of the third resistor is connected with the negative voltage sampling end and the positive current sampling end of the voltage and current acquisition circuit respectively, and the other end of the third resistor is connected with the ground and the negative current sampling end of the voltage and current acquisition circuit respectively.
Further, the voltage and current acquisition circuit comprises a voltage acquisition operational amplifier and a current acquisition operational amplifier;
The input end of the voltage acquisition operational amplifier is connected with two voltage output ends of the linear regulation control circuit, and the output end of the voltage acquisition operational amplifier is respectively connected with the main control circuit and the constant voltage and constant current control circuit;
The input end of the current collection operational amplifier is connected with the two current collection ends of the linear regulation control circuit, and the output end of the current collection operational amplifier is respectively connected with the main control circuit, the current collection processing circuit and the constant voltage and constant current control circuit.
Further, the current acquisition processing circuit comprises a fast comparator, a fourth resistor, a fifth resistor and a sixth resistor;
The negative input end of the rapid comparator is connected with the voltage and current acquisition circuit; one end of the fourth resistor is connected with a reference voltage, one end of the fifth resistor is grounded, and the other ends of the fourth resistor and the fifth resistor are connected with the positive input end of the rapid comparator; the output end of the fast comparator is respectively connected with the main control circuit and the front-end voltage output adjusting circuit; one end of the sixth resistor is connected with the output end of the fast comparator, and the other end of the sixth resistor is connected with a pull-up power supply.
Further, the main control circuit adopts a TMS320F28377S chip.
The invention is realized in the following way: the method for processing the constant current source output voltage convex wave needs to use the processing circuit, and comprises the following steps:
Setting a voltage output value V set and a current output value I set through the main control circuit, and outputting V set and I set signals to the constant voltage and constant current control circuit; meanwhile, the main control circuit outputs PWMA and PWMB signals to the front-end switch power supply BACK circuit;
after the front-end switch power supply BACK circuit receives PWMA and PWMB signals, a first MOS tube and a second MOS tube in the front-end switch power supply BACK circuit are driven to be conducted so as to output a voltage VPP signal to the front-end voltage output adjusting circuit; after receiving the voltage VPP signal, the front-end voltage output adjusting circuit enables a fourth MOS tube in the front-end voltage output adjusting circuit to be driven to be conducted so as to output a voltage VCC signal to the linear adjusting control circuit;
After the constant voltage and constant current control circuit receives the V set and I set signals, enabling the voltage operational amplifier and the current operational amplifier of the constant voltage and constant current control circuit to output high level so as to drive a fifth MOS tube in the linear regulation control circuit to be conducted, and outputting a voltage and current value;
The voltage and current acquisition circuit acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit feeds back acquired voltage VFB and IFB current signals to the constant voltage and constant current control circuit in real time so that the constant voltage and constant current control circuit can adjust and drive the conduction degree of a fifth MOS tube in the linear regulation control circuit, and therefore the linear regulation control circuit can stably output a required voltage and current value; the voltage and current acquisition circuit feeds back acquired voltage VFB and current IFB signals to the main control circuit in real time so as to enable the main control circuit to perform real-time monitoring processing; the voltage and current acquisition circuit feeds back the acquired current IFB signal to the current acquisition processing circuit in real time; the current acquisition processing circuit compares the received current IFB signal with a preset value set in the current acquisition processing circuit, and enables a fast comparator of the current acquisition processing circuit to output low-level pulses;
When the external loop is disconnected and the current is turned off to enable the linear regulation control circuit to be out of control, the linear regulation control circuit directly outputs the voltage VCC in the front-end voltage output regulating circuit, so that the output voltage forms a convex wave;
After the voltage and current acquisition circuit acquires the changes of the voltage VFB and the current IFB in the loop, the changes of the voltage VFB and the current IFB signals are fed BACK to the main control circuit, and the main control circuit enables the first MOS tube and the second MOS tube in the front-end switching power supply BACK circuit to be driven to be turned off, so that the voltage and current value output of the linear regulation control circuit is indirectly turned off; meanwhile, the voltage and current acquisition circuit feeds back the change of the current IFB signal to the current acquisition and processing circuit, the current acquisition and processing circuit compares the received current IFB signal, a high-level pulse is output to the front-end voltage output adjustment circuit by the fast comparator of the current acquisition and processing circuit, and a third MOS tube and a fourth MOS tube in the front-end voltage output adjustment circuit are enabled to be conducted and closed by the high-level pulse, so that the voltage VPP input to the front-end voltage output adjustment circuit is divided by the first resistor and the second resistor, and then the voltage VCC is output.
The invention has the following advantages: the invention compares the collected current values in real time through the current collection processing circuit and outputs high-level pulse when voltage convex waves appear, so that the front-end voltage output adjusting circuit can quickly adjust the output voltage VCC; meanwhile, the main control circuit enables the first MOS tube and the second MOS tube in the driving front-end switching power supply BACK circuit to be turned off, so that the voltage and current value output of the linear regulation control circuit is indirectly turned off; through the combined action of the two, the problem that the output voltage convex wave is caused by the instantaneous runaway of the whole circuit and related devices are damaged due to the instantaneous turn-off of the current caused by the disconnection of the output circuit can be effectively solved.
Drawings
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic block diagram of a processing circuit for a constant current source output voltage convex wave according to the present invention.
Fig. 2 is a circuit configuration diagram of a main control circuit in the present invention.
Fig. 3 is a circuit configuration diagram of a BACK-end switching power supply BACK circuit in the present invention.
Fig. 4 is a circuit configuration diagram of a constant voltage constant current control circuit and a linear adjustment control circuit in the present invention.
Fig. 5 is a circuit configuration diagram of a voltage and current acquisition circuit in the present invention.
Fig. 6 is a circuit configuration diagram of a current collecting and processing circuit in the present invention.
Fig. 7 is a circuit configuration diagram of a front-end voltage output adjusting circuit in the present invention.
Detailed Description
Referring to fig. 1 to 7, a preferred embodiment of a processing circuit 100 for constant current source output voltage convex wave according to the present invention is shown, wherein the processing circuit 100 includes a main control circuit 1, a front-end switching power supply BACK circuit 2, a constant voltage constant current control circuit 3, a linear adjustment control circuit 4, a voltage current acquisition circuit 5, a current acquisition processing circuit 6 and a front-end voltage output adjustment circuit 7;
The main control circuit 1 is connected with the front-end switching power supply BACK circuit 2, and the front-end switching power supply BACK circuit 2 is connected with the front-end voltage output adjusting circuit 7; the constant voltage and constant current control circuit 3 is connected with the main control circuit 1; the linear regulation control circuit 4 is connected with the constant voltage and constant current control circuit 3; the voltage and current acquisition circuit 5 is respectively connected with the main control circuit 1, the constant voltage and constant current control circuit 3 and the current acquisition and processing circuit 6; the current acquisition processing circuit 6 is respectively connected with the main control circuit 1 and the front-end voltage output adjusting circuit 7; the front-end voltage output adjusting circuit 7 is connected with the linear adjusting control circuit 4;
When the overcurrent protection test is performed, the test load 200 (namely the finished product of the lithium battery pack and the protection board thereof) is respectively connected with the linear regulation control circuit 4 and the voltage and current acquisition circuit 5;
When the device works, the main control circuit 1 controls the power supply output of the front-end switching power supply BACK circuit 2 and controls the driving level output of the constant voltage and constant current control circuit 3; the current acquisition and processing circuit 6 and the front-end voltage output adjusting circuit 7 control the output of the front-end voltage; the front-end voltage output adjusting circuit 7 controls the linear adjustment output of the linear adjustment control circuit 4 together with the constant voltage and constant current control circuit 3; the voltage and current acquisition circuit 5 acquires the voltage and current value on the loop in real time; the voltage and current acquisition circuit 5 provides the acquired voltage and current values for the main control circuit 1 to perform real-time monitoring processing, and in specific implementation, the main control circuit 1 performs processing such as collection, monitoring and display on the received voltage and current values, the voltage and current acquisition circuit 5 provides the acquired voltage and current values for the constant voltage and constant current control circuit 3 to perform real-time feedback adjustment and output high-level driving for the main control circuit 1, and the voltage and current acquisition circuit 5 provides the acquired current values for the current acquisition processing circuit 6 to perform real-time comparison processing; the current collection processing circuit 6 provides the output level to the main control circuit 1 for real-time monitoring processing, and the main control circuit 1 can collect, monitor, display and other processing on the output level. The main control circuit 1 is realized by adopting a TMS320F28377S chip.
In this embodiment, please refer to fig. 3, the front-end switching power BACK circuit 2 includes a driver U6, an isolation driving inductor T1, a first MOS transistor Q4, a second MOS transistor Q5, and an energy storage inductor L1;
The input end of the driver U6 is connected with the main control circuit 1, and the input end of the isolation driving inductor T1 is connected with the output end of the driver U6; the isolation driving inductor T1 is provided with two paths of outputs, one path of output is respectively connected with the G pole and the S pole of the first MOS tube Q4, the D pole of the first MOS tube Q4 is connected with the POWER supply POWER, the other path of output is respectively connected with the G pole and the S pole of the second MOS tube Q5, and the S pole of the second MOS tube Q5 is grounded GND; the S pole of the first MOS tube Q4 and the D pole of the second MOS tube Q5 are both connected with the input end of the energy storage inductor L1, and the output end of the energy storage inductor L1 is connected with the front-end voltage output adjusting circuit 7. Wherein the driver U6 is mainly used for enhancing signals; the isolation driving inductor T1 is mainly used for outputting two groups of complementary isolated signals; the energy storage inductor L1 is mainly used for playing a role in energy storage.
In the front-end switching power supply BACK circuit 2, the driver U6 is implemented by using a UCC27424 chip, and connects pin 1 of the UCC27424 chip with the PWMA signal output pin of the TMS320F28377S chip, and connects pin 4 of the UCC27424 chip with the PWMB signal output pin of the TMS320F28377S chip; the pin 5 and the pin 7 of the UCC27424 chip are respectively connected with two input ends of the isolation driving inductor T1, and a capacitor C3 is further arranged between the pin 7 of the UCC27424 chip and the input end of the isolation driving inductor T1, and the capacitor C3 mainly plays a role in blocking direct current. The two paths of output of the isolation driving inductor T1 are respectively provided with a resistor R31 and a resistor R32 and a resistor R29 and a resistor R30, wherein the resistor R31 and the resistor R29 are used for controlling the corresponding time of the driving rising edge, and the resistor R32 and the resistor R30 mainly play a role in discharging. The S pole of the second MOS tube Q5 is also connected with the output end of the energy storage inductor L1 through a resistor R28 and a capacitor C2 respectively, wherein the resistor R28 is a dummy load, and the capacitor C2 mainly plays roles of energy storage and filtering.
When the front-end switching power supply BACK circuit 2 works, the driver U6 performs enhancement processing on the PWMA signal and the PWMB signal output by the main control circuit 1, and outputs the PWMA signal and the PWMB signal after the enhancement processing to the isolation driving inductor T1; theisolationdrivinginductorT1dividesthePWMAsignalandthePWMBsignalintotwogroupsofcomplementaryisolatedBPWMA/BPWM-aandBPWMB/BPWM-bsignals,anddrivesthefirstmostransistorq4andthesecondmostransistorq5tobeturnedonrespectively,soastooutputavoltagetothefront-endvoltageoutputadjustingcircuit7throughtheenergystorageinductorl1. Meanwhile, in the implementation, the level of the output voltage VPP of the front-end switching power supply BACK circuit 2 can be further adjusted by adjusting the duty ratio of the PWMA signal and the PWMB signal output by the main control circuit 1.
In this embodiment, please refer to fig. 7, the front-end voltage output adjusting circuit 7 includes a first capacitor C1, a third MOS transistor Q3, a fourth MOS transistor Q2, a first resistor R1 and a second resistor R6;
One end of the first capacitor C1 is connected with the current acquisition and processing circuit 6, and the other end of the first capacitor C1 is connected with the G pole of the third MOS tube Q3; the D pole of the third MOS tube Q3 is connected with the G pole of the fourth MOS tube Q2; the front-end switching power supply BACK circuit 2 is connected with the D electrode of the fourth MOS tube Q2, and the D electrode of the fourth MOS tube Q2 is connected with the S electrode of the fourth MOS tube Q2 through the first resistor R1; one end of the second resistor R6 is connected with the S pole of the fourth MOS tube Q2, and the other end of the second resistor R6 is commonly grounded GND with the S pole of the third MOS tube Q3. Wherein, the first capacitor C1 mainly plays a role in isolating direct-current voltage control; the first resistor R1 and the second resistor R6 mainly play a role of voltage division.
In the front-end voltage output adjusting circuit 7, a resistor R8 is further disposed between the first capacitor C1 and the G pole of the third MOS transistor Q3, a resistor R9 is further disposed between the G pole and the S pole of the third MOS transistor Q3, a resistor R5 is further disposed between the D pole and the G pole of the fourth MOS transistor Q2, and the resistor R8, the resistor R9, and the resistor R5 all play a driving role.
When the front-end voltage output adjusting circuit 7 works, in a default state, the third MOS transistor Q3 is in an off state, the fourth MOS transistor Q2 is in an on state, the first resistor R1 is used in a short circuit, and the second resistor R6 is used purely as a dummy load, so that the voltage VPP signal is VCC after passing through the front-end voltage output adjusting circuit 7, and the voltage vcc=voltage VPP. When the first capacitor C1 receives the high-level pulse transmitted by the current collecting and processing circuit 6, the third MOS transistor Q3 is enabled to be turned on, and the fourth MOS transistor Q2 is indirectly controlled to be turned off, so that the voltage VPP signal is divided by the first resistor R1 and the second resistor R6 and then the voltage VCC is output.
In this embodiment, please refer to fig. 4, the constant voltage and constant current control circuit 3 includes a voltage operational amplifier N1A, a current operational amplifier N1B, a first diode D1 and a second diode D2;
The positive input ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the main control circuit 1; the negative input end of the voltage operational amplifier N1A and the negative input end of the current operational amplifier N1B are connected with the voltage and current acquisition circuit 5; the output ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the linear regulation control circuit 4; the first diode D1 is connected in parallel with the output end of the current operational amplifier N1B, and the second diode D2 is connected in parallel with the output end of the voltage operational amplifier N1A. The voltage operational amplifier N1A and the current operational amplifier N1B can be realized by adopting an ADA4522-2 operational amplifier.
In the constant voltage and constant current control circuit 3, two input ends of the voltage operational amplifier N1A are respectively provided with a resistor R10 and a resistor R12, and an output end of the voltage operational amplifier N1A is provided with a resistor R11; the two input ends of the current operational amplifier N1B are respectively provided with a resistor R2 and a resistor R4, and the output end of the current operational amplifier N1B is provided with a resistor R3; the resistor R10, the resistor R12, the resistor R2 and the resistor R4 mainly play a role in matching, and the resistor R11 and the resistor R3 mainly play a role in driving. The first diode D1 mainly plays a role of accelerating the turn-off and protection resistor R3, and the second diode D2 mainly plays a role of accelerating the turn-off and protection resistor R11.
When the constant voltage and constant current control circuit 3 works, the voltage operational amplifier N1A and the current operational amplifier N1B can be enabled to output high level to the linear regulation control circuit 4 when the constant voltage and constant current control circuit 3 receives the V set and I set signals set and output by the main control circuit 1. When the constant voltage and constant current control circuit 3 receives the voltage VFB and the current IFB signals fed back by the voltage and current acquisition circuit 5, the voltage operational amplifier N1A and the current operational amplifier N1B are enabled to adjust the high level of the output.
In this embodiment, please refer to fig. 4, wherein the linear adjustment control circuit 4 includes a fifth MOS transistor Q1 and a third resistor R7;
The G pole of the fifth MOS tube Q1 is connected with the constant voltage and constant current control circuit 3, and the D pole of the fifth MOS tube Q1 is connected with the front-end voltage output adjusting circuit 7; the S electrode of the fifth MOS tube Q1 is connected with the positive voltage sampling end of the voltage and current acquisition circuit 5; one end of the third resistor R7 is respectively connected with the negative voltage sampling end and the positive current sampling end of the voltage and current acquisition circuit 5, and the other end of the third resistor R7 is respectively connected with the ground GND and the negative current sampling end of the voltage and current acquisition circuit 5; the third resistor R7 is mainly used for sampling.
When the linear regulation control circuit 4 works, an output end PV+/PV-of the linear regulation control circuit 4 is required to be connected to the test load 200 so as to realize that an output voltage is loaded on the test load 200 for testing; when the linear regulation control circuit 4 receives the high level output by the constant voltage and constant current control circuit 3, the fifth MOS transistor Q1 is driven to be conducted, so that a voltage and current value is output. Meanwhile, the fifth MOS transistor Q1 is driven to adjust the conduction degree according to the high level of the regulated output of the constant voltage and constant current control circuit 3, so as to realize the voltage and current value required by stable output.
In this embodiment, please refer to fig. 5, the voltage and current collection circuit 5 includes a voltage collection op-amp N2A and a current collection op-amp N2B;
the input end of the voltage acquisition operational amplifier N2A is connected with two voltage output ends PV+/PV-of the linear regulation control circuit 4, and the output end of the voltage acquisition operational amplifier N2A is respectively connected with the main control circuit 1 and the constant voltage and constant current control circuit 3;
The input end of the current collection operational amplifier N2B Is connected with two current collection ends is+/Is-of the linear regulation control circuit 4, and the output end of the current collection operational amplifier N2B Is respectively connected with the main control circuit 1, the current collection processing circuit 6 and the constant voltage and constant current control circuit 3. The voltage sampling operational amplifier N2A and the current sampling operational amplifier N2B can be realized by adopting an ADA4522-2 operational amplifier.
In the voltage and current acquisition circuit 5, a resistor R16 is disposed at the negative input end of the voltage acquisition operational amplifier N2A, a resistor R14 and a resistor R13 are disposed in parallel at the positive input end of the voltage acquisition operational amplifier N2A, and one end of the resistor R13 is grounded GND; the negative input end of the current collection operational amplifier N2B is provided with a resistor R24, the positive input end of the voltage collection operational amplifier N2B is provided with a resistor R21 and a resistor R19 in parallel, and one end of the resistor R19 is grounded to GND; the output end of the voltage acquisition operational amplifier N2A is provided with a resistor R15, and a resistor R17 is arranged between the output end and the negative input end of the voltage acquisition operational amplifier N2A; the output end of the current collection operational amplifier N2B is provided with a resistor R23, and a resistor R27 is arranged between the output end and the negative input end of the current collection operational amplifier N2B; the resistors R13, R14, R16, R19, R21 and R24 mainly play a role in matching, and the resistors R15, R17, R23 and R27 mainly play a role in driving.
When the voltage and current acquisition circuit 5 works, the voltage output by the linear regulation control circuit 4 can be acquired through the voltage acquisition operational amplifier N2A, and the current of the third resistor R7 in the linear regulation control circuit 4 can be acquired through the current acquisition operational amplifier N2B; the collected voltage VFB and current IFB signals are respectively fed back to the main control circuit 1, the current collecting and processing circuit 6 and the constant voltage and constant current control circuit 3.
In the present embodiment, please refer to fig. 6, the current collecting and processing circuit 6 includes a fast comparator N3A, a fourth resistor R26, a fifth resistor R25, and a sixth resistor R18;
The negative input end of the fast comparator N3A is connected with the voltage and current acquisition circuit 5; one end of the fourth resistor R26 is connected to a reference voltage VREF, one end of the fifth resistor R25 is grounded to GND, and the other ends of the fourth resistor R26 and the fifth resistor R25 are both connected to the positive input end of the fast comparator N3A; the output end of the fast comparator N3A is respectively connected with the main control circuit 1 and the front-end voltage output adjusting circuit 7; one end of the sixth resistor R18 is connected to the output end of the fast comparator N3A, and the other end is connected to the pull-up power VCCD. The fast comparator N3A is mainly configured to compare the current IFB signal fed back by the voltage and current collecting circuit 5 with a preset value set in the interior, and output a corresponding level according to a comparison result, where the fast comparator N3A may be an SGM8745 comparator; the fourth resistor R26 and the fifth resistor R25 mainly play a role in voltage division; the sixth resistor R18 functions as a pull-up voltage.
In the current collecting and processing circuit 6, a resistor R20 is disposed at the negative input end of the fast comparator N3A, and a resistor R22 is disposed at the positive input end of the fast comparator N3A; resistor R20 and resistor R22 primarily serve as matches.
When the current acquisition processing circuit 6 works, the current IFB signal fed back by the voltage and current acquisition circuit 5 is compared with the preset value set in the interior, and if the current IFB signal is larger than the preset value set in the interior, a high-level pulse is output; if the current IFB signal is smaller than or equal to the preset value, a low-level pulse is output; at the same time, the level pulse is also output to the main control circuit 1 and the front-end voltage output adjusting circuit 7.
The invention also provides a processing method of the constant current source output voltage convex wave, which needs to use the processing circuit 100, and comprises the following steps:
the voltage output value V set and the current output value I set are set through the main control circuit 1, and particularly V set and I set can be set according to actual output requirements, and signals of V set and I set are output to the constant voltage and constant current control circuit 3; meanwhile, the main control circuit 1 outputs PWMA and PWMB signals with a certain duty ratio to the front-end switch power supply BACK circuit 2; of course, the duty ratio of the PWMA signal and the PWMB signal output by the main control circuit 1 may be adjusted, so as to further adjust the output voltage VPP of the front-end switching power supply BACK circuit 2;
After the front-end switch power BACK circuit 2 receives PWMA and PWMB signals, the first MOS transistor Q4 and the second MOS transistor Q5 in the front-end switch power BACK circuit 2 are driven to be turned on, so as to output a voltage VPP signal to the front-end voltage output adjusting circuit 7; after the front-end voltage output adjusting circuit 7 receives the voltage VPP signal, the fourth MOS Q2 in the front-end voltage output adjusting circuit 7 is driven to be turned on, so as to output a voltage VCC signal to the linear adjusting control circuit 4;
After the constant voltage and constant current control circuit 3 receives the signals V set and I set, the voltage operational amplifier N1A and the current operational amplifier N1B of the constant voltage and constant current control circuit 3 are enabled to output high level so as to drive the fifth MOS transistor Q1 in the linear regulation control circuit 4 to be conducted, so that a current value is output;
The voltage and current acquisition circuit 5 acquires the voltage VFB and the current IFB in the loop; the voltage and current acquisition circuit 5 feeds back the acquired voltage VFB and IFB current signals to the constant voltage and constant current control circuit 3 in real time, so that the constant voltage and constant current control circuit 3 adjusts and drives the conduction degree of the fifth MOS transistor in the linear regulation control circuit 4, and the linear regulation control circuit 4 stably outputs a required voltage and current value, wherein the voltage value is recorded as v+; the voltage and current acquisition circuit 5 feeds back the acquired voltage VFB and current IFB signals to the main control circuit 1 in real time so that the main control circuit 1 can perform real-time monitoring (particularly, can perform the processes of collection, monitoring, display and the like); the voltage and current acquisition circuit 5 feeds back the acquired current IFB signal to the current acquisition processing circuit 6 in real time; the current acquisition processing circuit 6 compares the received current IFB signal with a preset value set in the current acquisition processing circuit 6, and enables a fast comparator N3A of the current acquisition processing circuit 6 to output a low-level pulse; when no convex wave appears, the current IFB signal received by the current collecting and processing circuit 6 is smaller than or equal to the preset value set in the current collecting and processing circuit, and the fast comparator N3A outputs a low-level pulse by default at the moment;
When the external loop is disconnected and the current is turned off so that the linear regulation control circuit 4 is out of control, namely, when the external loop is disconnected and the current is turned off instantaneously, the linear regulation control circuit 4 is out of control, and the linear regulation control circuit 4 directly outputs the voltage VCC in the front-end voltage output regulating circuit 7 so that the output voltage forms a convex wave; since the voltage VCC output by the front-end voltage output adjusting circuit 7 is greater than v+, the output voltage v+ is pulled up instantaneously, and a convex wave is formed at this time;
After the voltage and current acquisition circuit 5 acquires the changes of the voltage VFB and the current IFB in the loop, the changes of the signals of the voltage VFB and the current IFB are fed BACK to the main control circuit 1, the main control circuit 1 enables the first MOS transistor Q4 and the second MOS transistor Q5 in the front-end switching power supply BACK circuit 2 to be driven to be turned off, so that the voltage and current value output of the linear regulation control circuit 4 is indirectly turned off, and the process cannot thoroughly eliminate the output voltage convex wave due to too slow time;
Meanwhile, the voltage-current collection circuit 5 feeds back the change of the current IFB signal to the current collection processing circuit 6, after the current collection processing circuit 6 compares the received current IFB signal, the fast comparator N3A of the current collection processing circuit 6 is enabled to output a high-level pulse to the front-end voltage output adjustment circuit 7 (when a voltage surge occurs, the current IFB signal received by the current collection processing circuit 6 is larger than a preset value set inside, at the moment, the fast comparator N3A can output a high-level pulse), and the third MOS Q3 and the fourth MOS Q2 in the front-end voltage output adjustment circuit 7 are enabled to be turned on and turned off through the high-level pulse, so that the voltage VPP input to the front-end voltage output adjustment circuit 7 is divided by the first resistor R1 and the second resistor R6, and then the voltage VCC is output; since the voltage VPP is divided by the first resistor R1 and the second resistor R6, the output of the voltage VCC is greatly reduced, so that the voltage VCC is smaller than v+.
In summary, the current collecting and processing circuit is used to compare the collected current values in real time and output high-level pulses when voltage convex waves occur, so that the front-end voltage output adjusting circuit can quickly adjust the output voltage VCC; meanwhile, the main control circuit enables the first MOS tube and the second MOS tube in the driving front-end switching power supply BACK circuit to be turned off, so that the voltage and current value output of the linear regulation control circuit is indirectly turned off; through the combined action of the two, the problem that the output voltage convex wave is caused by the instantaneous runaway of the whole circuit and related devices are damaged due to the instantaneous turn-off of the current caused by the disconnection of the output circuit can be effectively solved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.

Claims (7)

1. A processing circuit of constant current source output voltage convex wave is characterized in that: the device comprises a main control circuit, a front-end switching power supply BACK circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a current acquisition and processing circuit and a front-end voltage output adjustment circuit;
The main control circuit is connected with the front-end switching power supply BACK circuit, and the front-end switching power supply BACK circuit is connected with the front-end voltage output adjusting circuit; the constant voltage and constant current control circuit is connected with the main control circuit; the linear regulation control circuit is connected with the constant voltage and constant current control circuit; the voltage and current acquisition circuit is respectively connected with the main control circuit, the constant voltage and constant current control circuit and the current acquisition and processing circuit; the current acquisition processing circuit is respectively connected with the main control circuit and the front-end voltage output adjusting circuit; the front-end voltage output adjusting circuit is connected with the linear adjusting control circuit;
When overcurrent protection test is carried out, a test load is respectively connected with the linear regulation control circuit and the voltage and current acquisition circuit;
when the device works, the main control circuit controls the power supply output of the front-end switch power supply BACK circuit and the driving level output of the constant voltage and constant current control circuit; the current acquisition processing circuit and the front-end voltage output adjusting circuit control the output of the front-end voltage; the front-end voltage output adjusting circuit and the constant voltage and constant current control circuit control the linear adjustment output of the linear adjustment control circuit together; the voltage and current acquisition circuit acquires the voltage and current value on the loop in real time; the voltage and current acquisition circuit provides the acquired voltage and current values for the main control circuit to perform real-time monitoring processing, the voltage and current acquisition circuit provides the acquired voltage and current values for the constant voltage and constant current control circuit to perform real-time feedback adjustment and output high-level driving for the main control circuit, and the voltage and current acquisition circuit provides the acquired current values for the current acquisition processing circuit to perform real-time comparison processing; the current acquisition processing circuit provides the output level for the main control circuit to perform real-time monitoring processing;
The front-end switching power supply BACK circuit comprises a driver, an isolation driving inductor, a first MOS tube, a second MOS tube and an energy storage inductor;
The input end of the driver is connected with the main control circuit, and the input end of the isolation driving inductor is connected with the output end of the driver; the isolation driving inductor is provided with two paths of outputs, one path of output is respectively connected with the G pole and the S pole of the first MOS tube, the D pole of the first MOS tube is connected with a power supply, the other path of output is respectively connected with the G pole and the S pole of the second MOS tube, and the S pole of the second MOS tube is grounded; the S pole of the first MOS tube and the D pole of the second MOS tube are connected with the input end of the energy storage inductor, and the output end of the energy storage inductor is connected with the front-end voltage output adjusting circuit;
the front-end voltage output adjusting circuit comprises a first capacitor, a third MOS tube, a fourth MOS tube, a first resistor and a second resistor;
One end of the first capacitor is connected with the current acquisition and processing circuit, and the other end of the first capacitor is connected with the G pole of the third MOS tube; the D pole of the third MOS tube is connected with the G pole of the fourth MOS tube; the front-end switching power supply BACK circuit is connected with the D electrode of the fourth MOS tube, and the D electrode of the fourth MOS tube is connected with the S electrode of the fourth MOS tube through the first resistor; one end of the second resistor is connected with the S electrode of the fourth MOS tube, and the other end of the second resistor is grounded together with the S electrode of the third MOS tube.
2. The processing circuit for a constant current source output voltage convex wave according to claim 1, wherein: the constant voltage and constant current control circuit comprises a voltage operational amplifier, a current operational amplifier, a first diode and a second diode;
The positive input ends of the voltage operational amplifier and the current operational amplifier are connected with the main control circuit; the negative input ends of the voltage operational amplifier and the current operational amplifier are connected with the voltage and current acquisition circuit; the output ends of the voltage operational amplifier and the current operational amplifier are connected with the linear regulation control circuit; the first diode is connected in parallel with the output end of the current operational amplifier, and the second diode is connected in parallel with the output end of the voltage operational amplifier.
3. The processing circuit for a constant current source output voltage convex wave according to claim 1, wherein: the linear regulation control circuit comprises a fifth MOS tube and a third resistor;
the G pole of the fifth MOS tube is connected with the constant voltage and constant current control circuit, and the D pole of the fifth MOS tube is connected with the front-end voltage output adjusting circuit; the S pole of the fifth MOS tube is connected with the positive voltage sampling end of the voltage and current acquisition circuit; one end of the third resistor is connected with the negative voltage sampling end and the positive current sampling end of the voltage and current acquisition circuit respectively, and the other end of the third resistor is connected with the ground and the negative current sampling end of the voltage and current acquisition circuit respectively.
4. The processing circuit for a constant current source output voltage convex wave according to claim 1, wherein: the voltage and current acquisition circuit comprises a voltage acquisition operational amplifier and a current acquisition operational amplifier;
The input end of the voltage acquisition operational amplifier is connected with two voltage output ends of the linear regulation control circuit, and the output end of the voltage acquisition operational amplifier is respectively connected with the main control circuit and the constant voltage and constant current control circuit;
The input end of the current collection operational amplifier is connected with the two current collection ends of the linear regulation control circuit, and the output end of the current collection operational amplifier is respectively connected with the main control circuit, the current collection processing circuit and the constant voltage and constant current control circuit.
5. The processing circuit for a constant current source output voltage convex wave according to claim 1, wherein: the current acquisition processing circuit comprises a fast comparator, a fourth resistor, a fifth resistor and a sixth resistor;
The negative input end of the rapid comparator is connected with the voltage and current acquisition circuit; one end of the fourth resistor is connected with a reference voltage, one end of the fifth resistor is grounded, and the other ends of the fourth resistor and the fifth resistor are connected with the positive input end of the rapid comparator; the output end of the fast comparator is respectively connected with the main control circuit and the front-end voltage output adjusting circuit; one end of the sixth resistor is connected with the output end of the fast comparator, and the other end of the sixth resistor is connected with a pull-up power supply.
6. The processing circuit for a constant current source output voltage convex wave according to claim 1, wherein: the main control circuit adopts a TMS320F28377S chip.
7. A processing method of constant current source output voltage convex wave is characterized in that: the method requiring the use of a processing circuit according to any one of claims 1-6, the processing method comprising:
setting a voltage output value by the main control circuit And current output valueWill beAndThe signal is output to the constant voltage and constant current control circuit; meanwhile, the main control circuit outputs PWMA and PWMB signals to the front-end switch power supply BACK circuit;
after the front-end switch power supply BACK circuit receives PWMA and PWMB signals, a first MOS tube and a second MOS tube in the front-end switch power supply BACK circuit are driven to be conducted so as to output a voltage VPP signal to the front-end voltage output adjusting circuit; after receiving the voltage VPP signal, the front-end voltage output adjusting circuit enables a fourth MOS tube in the front-end voltage output adjusting circuit to be driven to be conducted so as to output a voltage VCC signal to the linear adjusting control circuit;
the constant voltage and constant current control circuit receives AndAfter the signal, enabling the voltage operational amplifier and the current operational amplifier of the constant voltage and constant current control circuit to output high level so as to drive a fifth MOS tube in the linear regulation control circuit to be conducted, thereby outputting a voltage and current value;
The voltage and current acquisition circuit acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit feeds back acquired voltage VFB and IFB current signals to the constant voltage and constant current control circuit in real time so that the constant voltage and constant current control circuit can adjust and drive the conduction degree of a fifth MOS tube in the linear regulation control circuit, and therefore the linear regulation control circuit can stably output a required voltage and current value; the voltage and current acquisition circuit feeds back acquired voltage VFB and current IFB signals to the main control circuit in real time so as to enable the main control circuit to perform real-time monitoring processing; the voltage and current acquisition circuit feeds back the acquired current IFB signal to the current acquisition processing circuit in real time; the current acquisition processing circuit compares the received current IFB signal with a preset value set in the current acquisition processing circuit, and enables a fast comparator of the current acquisition processing circuit to output low-level pulses;
When the external loop is disconnected and the current is turned off to enable the linear regulation control circuit to be out of control, the linear regulation control circuit directly outputs the voltage VCC in the front-end voltage output regulating circuit, so that the output voltage forms a convex wave;
After the voltage and current acquisition circuit acquires the changes of the voltage VFB and the current IFB in the loop, the changes of the voltage VFB and the current IFB signals are fed BACK to the main control circuit, and the main control circuit enables the first MOS tube and the second MOS tube in the front-end switching power supply BACK circuit to be driven to be turned off, so that the voltage and current value output of the linear regulation control circuit is indirectly turned off; meanwhile, the voltage and current acquisition circuit feeds back the change of the current IFB signal to the current acquisition and processing circuit, the current acquisition and processing circuit compares the received current IFB signal, a high-level pulse is output to the front-end voltage output adjustment circuit by the fast comparator of the current acquisition and processing circuit, and a third MOS tube and a fourth MOS tube in the front-end voltage output adjustment circuit are enabled to be conducted and closed by the high-level pulse, so that the voltage VPP input to the front-end voltage output adjustment circuit is divided by the first resistor and the second resistor, and then the voltage VCC is output.
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