CN220798092U

CN220798092U - Heavy current reversing control circuit

Info

Publication number: CN220798092U
Application number: CN202322567298.1U
Authority: CN
Inventors: 石顺桥
Original assignee: Nanjing Ah Electronic Science & Technology Co ltd
Current assignee: Nanjing Ah Electronic Science & Technology Co ltd
Priority date: 2023-09-20
Filing date: 2023-09-20
Publication date: 2024-04-16
Anticipated expiration: 2033-09-20

Abstract

The utility model relates to a heavy current switching-over control circuit relates to the field of analog integrated circuit technique, and it includes control module, isolation module, drive module and load module, and control module's output is connected with isolation module's input, and isolation module's output is connected with drive module's input, and drive module's input is connected with load module, and isolation module includes four opto-coupler circuit and power supply circuit, and opto-coupler circuit's input is connected with control module's output, opto-coupler circuit's collecting electrode is connected with power supply circuit, and opto-coupler circuit's projecting pole is connected with drive module's signal input part. According to the optical coupling circuit, the optical coupling module is arranged between the control module and the driving module, so that the power supply circuit supplies power to the optical coupling circuit, the optical coupling module isolates signals, the input-output side circuit is effectively electrically isolated, signals are output in an optical mode, and the circuit has a good anti-interference effect.

Description

Heavy current reversing control circuit

Technical Field

The present application relates to the field of analog integrated circuit technology, and in particular, to a high current commutation control circuit.

Background

At present, a conventional load current reversing circuit (commonly called an H-bridge driving circuit) almost uses a bootstrap circuit consisting of a capacitor and a diode to drive a high-voltage end power MOS tube of the H-bridge. The biggest problem of this kind of circuit is that there is the requirement to the frequency of input drive signal, and must not be too low, and the appearance value size, performance, the reliability requirement of electric capacity are also very high. As the capacitance performance is reduced due to long-time use, the driving voltage of the MOS tube is reduced, so that the internal resistance of the MOS tube is increased, the heating is increased, the use efficiency of electric energy is reduced, and even the MOS tube is burnt out. And when the driving frequency is too low, the bootstrap voltage is reduced, so that the driving voltage of the high-voltage end of the H bridge is reduced, the power MOS tube cannot be normally conducted, and the circuit cannot normally work.

Disclosure of Invention

In order to improve the stability of an H bridge circuit in the use process and improve the use reliability, the application provides a high-current reversing control circuit.

The application provides a heavy current commutation control circuit adopts following technical scheme:

the utility model provides a heavy current switching-over control circuit, includes control module, isolation module, drive module and load module, control module's output with isolation module's input is connected, isolation module's output is connected with drive module's input, drive module's input is connected with load module, isolation module includes four opto-coupler circuits and power supply circuit, opto-coupler circuit's input is connected with control module's output, opto-coupler circuit's collecting electrode is connected with power supply circuit, opto-coupler circuit's projecting pole is connected with drive module's signal input part.

By adopting the technical scheme, the power supply circuit supplies power to the optocoupler circuits, under the control action of the control circuit, the four optocoupler circuits are respectively enabled to work, the optocoupler circuits are enabled to adjust the driving of the driving module, and the driving module drives the load module to work according to the needs. The optocoupler module is arranged between the control module and the driving module, so that the power supply circuit supplies power to the optocoupler circuit, the optocoupler module isolates signals, the input-output side circuit is effectively electrically isolated, signals are output in an optical mode, and the circuit has a good anti-interference effect.

Optionally, the power supply circuit includes three power supply, power supply's input is connected with direct current drive voltage, power supply's output is connected with the tie point between opto-coupler module and the drive module respectively.

Through adopting above-mentioned technical scheme, supply power through small-size DCAC power module, be convenient for convert the direct current busbar high voltage of input into 15V direct current voltage output, can provide stable bars source voltage for high-power MOS pipe.

Optionally, a first capacitor is connected in parallel between the input ends of the power supply.

Through adopting above-mentioned technical scheme, the first electric capacity of setting can play certain filtering action to the signal, and unnecessary high frequency alternating current and clutter are filtered, can play certain signal isolation effect, make input voltage steady, and the fluctuation is little, and the input is stable.

Optionally, a second capacitor is respectively connected in parallel between the output ends of the power supply.

Through adopting above-mentioned technical scheme, connect in parallel the second electric capacity at power supply's output, be convenient for play certain filtering action to output signal, filtering unnecessary high frequency alternating current and clutter makes output voltage more steady, and the fluctuation is little, and the output is stable.

Optionally, a first protection resistor is disposed between the output end of the control module and the input end of the optocoupler module, and one end of the control module is grounded.

Through adopting above-mentioned technical scheme, the first protection resistance that sets up can play certain current limiting effect to the circuit, because control module's pin output current is limited, through first protection resistance, can protect the circuit.

Optionally, the drive module includes and connects gradually first MOS pipe, second MOS pipe, third MOS pipe, fourth MOS pipe and two protection circuit, protection circuit sets up respectively between first MOS pipe and second MOS pipe, third MOS pipe and fourth MOS pipe, the drain electrode of first MOS pipe and the drain electrode of third MOS pipe are connected with the input of high-pressure heavy current respectively, the source electrode of second MOS pipe and the source electrode of fourth MOS pipe are connected with the output of high-pressure heavy current respectively, the tie point of first MOS pipe and second MOS pipe is connected with load module's one end, the tie point of third MOS pipe and fourth MOS pipe is connected with load module's the other end.

Through adopting above-mentioned technical scheme, drive first MOS pipe, second MOS pipe, third MOS pipe and fourth MOS pipe in proper order through the opto-coupler module and carry out work, make high-voltage heavy current drive to load module, can improve the drive effect to load module, be convenient for operate load module's operation as required.

Optionally, the protection circuit includes second protection resistance, first diode, second diode and third electric capacity, first diode and second protection resistance establish ties in proper order and set up between the drain electrode of second MOS pipe and the drain electrode of first MOS pipe, the second diode sets up between the source electrode of second MOS pipe and drain electrode, the parallelly connected setting of third electric capacity and second protection resistance.

Through adopting above-mentioned technical scheme, through second protection resistance, first diode and second diode and third electric capacity, can play certain guard action to the circuit, make the MOS pipe release the high voltage pulse that produces when turning off promptly when turning off, protection MOS pipe can not be by reverse breakdown.

Optionally, a first resistor is respectively arranged between the cathode of the optocoupler circuit and the grids of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube, a second resistor is respectively arranged between the connection point of the first resistor and the grids of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube and the sources of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube, and a fourth capacitor is respectively arranged between the anodes of the first MOS tube and the third MOS tube and between the anodes of the second resistor.

Through adopting above-mentioned technical scheme, through the first resistance that sets up, can play certain current limiting effect to the circuit. Through the second resistor that sets up, can play the effect that provides voltage release passageway for the grid of first MOS pipe, second MOS pipe, third MOS pipe and fourth MOS pipe. The fourth capacitor can improve the amplitude of signals, improve the voltage of output signals, increase the stability and reliability of signals, and further drive the corresponding first MOS tube and third MOS tube better.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the optocoupler module is arranged between the control module and the driving module, so that the power supply circuit supplies power to the optocoupler circuit, the optocoupler module isolates signals, the input-output side circuit is effectively electrically isolated, and signals are output in an optical mode, so that the circuit has a good anti-interference effect;

2. the small-size DCAC power module is used for supplying power, so that the input direct-current bus high voltage is conveniently converted into 15V direct-current voltage to be output, and stable gate-source voltage can be provided for the high-power MOS tube;

drawings

Fig. 1 is a schematic diagram of the overall structure of a high-current commutation control circuit according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a control module of a high-current commutation control circuit according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a power supply module of a high-current commutation control circuit according to an embodiment of the application.

Fig. 4 is a schematic diagram of an optocoupler module, a driving module, and a load module of a power supply module of a high-current commutation control circuit according to an embodiment of the application.

Fig. 5 is an enlarged view of a portion a in fig. 4.

Fig. 6 is an enlarged view of the portion B in fig. 4.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-6.

The embodiment of the application discloses a high-current reversing control circuit. Referring to fig. 1 and 2, the high-current commutation control circuit includes a control module, an isolation module, a driving module, and a load module, wherein an output end of the control module is connected with an input end of the isolation module, an output end of the isolation module is connected with an input end of the driving module, and an input end of the driving module is connected with the load module.

Referring to fig. 2, 3 and 4, the isolation module includes four optocoupler circuits and a power supply circuit, an input end of each optocoupler circuit is connected with an output end of the control module, a collector electrode of each optocoupler circuit is connected with the power supply circuit, and an emitter electrode of each optocoupler circuit is connected with a signal input end of the driving module.

The power supply circuit comprises three power supplies, the input end of each power supply is connected with the direct current driving voltage, and the output end of each power supply is connected with the connecting point between the optical coupler module and the driving module. The first capacitor is connected in parallel between the input ends of the power supply, and can play a certain role in filtering the input of signals, so that unnecessary high-frequency alternating current and clutter are filtered, and the input voltage is stable and has small fluctuation. And the second capacitors are respectively connected in parallel between the output ends of the power supply, so that the output signals can be filtered conveniently through the second capacitors, and the output voltage is stable. A first protection resistor is arranged between the output end of the control module and the input end of the optocoupler module, one end of the control module is grounded, and the first protection resistor is connected with the output end of the control module through the first protection resistor to play a certain role in protecting a circuit.

Referring to fig. 5 and 6, in order to facilitate control of the load module, the driving module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, and two protection circuits sequentially connected, the protection circuits are respectively disposed between the first MOS transistor and the second MOS transistor, between the third MOS transistor and the fourth MOS transistor, a drain electrode of the first MOS transistor and a drain electrode of the third MOS transistor are respectively connected with an input end of high-voltage heavy current, a source electrode of the second MOS transistor and a source electrode of the fourth MOS transistor are respectively connected with an output end of high-voltage heavy current, a connection point of the first MOS transistor and the second MOS transistor is connected with one end of the load module, and a connection point of the third MOS transistor and the fourth MOS transistor is connected with the other end of the load module.

Referring to fig. 5 and 6, the protection circuit includes a second protection resistor, a first diode, a second diode, and a third capacitor, where the first diode and the second protection resistor are sequentially connected in series between a drain of the second MOS transistor and a drain of the first MOS transistor, the second diode is disposed between a source and a drain of the second MOS transistor, and the third capacitor is disposed in parallel with the second protection resistor.

Referring to fig. 5 and 6, a first resistor is respectively arranged between the cathode of the optocoupler circuit and the grids of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube, a second resistor is respectively arranged between the connection point of the first resistor and the grids of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube and the sources of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube, and a fourth capacitor is arranged between the anodes of the first MOS tube and the third MOS tube and the second resistor.

The implementation principle of the high-current reversing control circuit provided by the embodiment of the application is as follows:

if the load module is a direct current motor, direct current high voltage heavy current is input by the port P1 and output by the port P2. The dc drive voltage is input through the port J4, or may be directly introduced from P1 or P2. An input drive signal is input from the port J3. U5, U6 and U7 are three identical 3-watt DCDC modules, input direct-current voltage is input through a port J4, and the input direct-current voltage is converted into 3 paths of 15V driving voltage through DCDC conversion. The MOS tube driving signal is input by an interface J3, the input signal is derived from the output signal of the singlechip, the high level is 3.3V or 5V, and the driving signals J3P1 and J3P4 are in a group and have the same phase. The driving signals J3P2 and J3P3 are a group, and the phase of the driving signals is opposite to that of the previous group, and the driving signals J3P2 and J3P3 are complementary signals.

When at a certain working moment, the motor rotates positively, and the current is from P1 to P2. The control signals are as follows: and when the A group outputs high level, the B group outputs low level, after the input signals are isolated by four EL 817s of U1, U2, U3 and U4, the U1 and U4 output high level, the U2 and U3 output low level, the gate-source voltage of Q1 is 15V2, the gate-source voltage of Q4 is 15V1, and MOS tubes Q1 and Q4 are conducted. Similarly, the output of the group B is an inverse complementary signal, so the output is low level, the low level is output through the optocouplers U2 and U3, and the MOS transistors Q2 and Q3 are closed.

When the motor needs to be reversed, working current reversely flows, and the current is from P2 to P1, at this time, the B group outputs high level, after the input signals are isolated by four EL 817s of U1, U2, U3 and U4, the U1 and U4 output low level, the U2 and U3 output high level, the grid source voltage of Q2 is 15V1, the grid source voltage of Q3 is 15V3, and MOS tubes Q2 and Q3 are conducted. Similarly, the output of the group A is an inverse complementary signal, so the output is low level, the low level is output through the optocouplers U1 and U4, and the MOS transistors Q1 and Q4 are closed.

The circuit can always provide a stable gate source voltage, and has no requirement on driving frequency. The stability and the reliability of the H-bridge working circuit are greatly improved, and the H-bridge working circuit can be well applied to the fields of motors, coil control, inverter power supplies and the like and has great application value.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. A high-current reversing control circuit is characterized in that: the device comprises a control module, an isolation module, a driving module and a load module, wherein the output end of the control module is connected with the input end of the isolation module, the output end of the isolation module is connected with the input end of the driving module, the input end of the driving module is connected with the load module, the isolation module comprises four optocoupler circuits and a power supply circuit, the input end of the optocoupler circuits is connected with the output end of the control module, the collector electrode of the optocoupler circuits is connected with the power supply circuit, and the emitter electrode of the optocoupler circuits is connected with the signal input end of the driving module.

2. The high current commutation control circuit of claim 1, wherein: the power supply circuit comprises three power supplies, wherein the input end of each power supply is connected with the direct current driving voltage, and the output end of each power supply is connected with a connection point between the corresponding optocoupler module and the corresponding driving module.

3. The high current commutation control circuit of claim 2, wherein: a first capacitor is connected in parallel between the input ends of the power supply.

4. The high current commutation control circuit of claim 2, wherein: and second capacitors are respectively connected in parallel between the output ends of the power supply.

5. The high current commutation control circuit of claim 1, wherein: a first protection resistor is arranged between the output end of the control module and the input end of the optocoupler module, and one end of the control module is grounded.

6. The high current commutation control circuit of claim 1, wherein: the driving module comprises a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube and two protection circuits which are sequentially connected, wherein the protection circuits are respectively arranged between the first MOS tube and the second MOS tube, between the third MOS tube and the fourth MOS tube, the drain electrode of the first MOS tube and the drain electrode of the third MOS tube are respectively connected with the input end of high-voltage heavy current, the source electrode of the second MOS tube and the source electrode of the fourth MOS tube are respectively connected with the output end of the high-voltage heavy current, the connection point of the first MOS tube and the second MOS tube is connected with one end of the load module, and the connection point of the third MOS tube and the connection point of the fourth MOS tube are connected with the other end of the load module.

7. The high current commutation control circuit of claim 6, wherein: the protection circuit comprises a second protection resistor, a first diode, a second diode and a third capacitor, wherein the first diode and the second protection resistor are sequentially connected in series between the drain electrode of the second MOS tube and the drain electrode of the first MOS tube, the second diode is arranged between the source electrode and the drain electrode of the second MOS tube, and the third capacitor and the second protection resistor are arranged in parallel.

8. The high current commutation control circuit of claim 6, wherein: the first resistor is arranged between the cathode of the optocoupler circuit and the grid electrodes of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube respectively, the second resistor is arranged between the connection point of the first resistor and the grid electrodes of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube and the source electrodes of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube respectively, and the fourth capacitor is arranged between the anode of the first MOS tube and the anode of the third MOS tube and the second resistor.