Multifunctional bridge type driving circuit

Abstract

The utility model relates to a multifunctional bridge type driving circuit, and relates to the technical field of driving circuits. The first half-bridge driving module comprises a first half-bridge driving module and a first current amplification module, the input end of the first half-bridge driving module is electrically connected to the output end of the single-chip microcomputer, the output end of the single-chip microcomputer is used for outputting a pulse signal PWM1, the first half-bridge driving module is provided with a wiring pin PIN1 and a wiring pin PIN2, and the wiring pin PIN2 is connected with the first half-bridge driving module. The wiring pin PIN1 and the wiring pin PIN2 are used for being electrically connected to the two ends of a proportional valve coil. The input end of the first current amplification module is electrically connected to the output end of the first half-bridge driving module, and the output end of the first current amplification module is electrically connected to the input end of the single-chip microcomputer. According to the invention, the circuit can be monitored in real time while the load is driven.

Description

Technical Field

[0001] This application relates to the technical field of drive circuits, and in particular, to a multi-functional bridge drive circuit. Background Art

[0002] In the existing field of electronic technology, bridge drive circuits are widely used in various electrical devices to drive and control various loads and are controlled by controllers such as single-chip microcomputers. However, traditional bridge drive circuits often have a single function and cannot meet the requirements of modern electrical devices for multi-function and high efficiency. Therefore, how to design a multi-functional and high-efficiency bridge drive circuit has become an important research topic in the current field of electronic technology.

[0003] Traditional bridge drive circuits usually can only achieve basic drive functions and cannot effectively detect and control the working state of the circuit. This leads to various problems that may occur during the use of the circuit, such as heat loss and energy waste. To solve these problems, it is necessary to improve and optimize the traditional bridge drive circuit to improve its performance and stability in use. Utility Model Content

[0004] In order to be able to achieve real-time monitoring of the circuit while driving the load, this application provides a multi-functional bridge drive circuit.

[0005] The multi-functional bridge drive circuit provided by this application adopts the following technical solutions:

[0006] A multi-functional bridge drive circuit includes a first half-bridge drive module and a first current amplification module. The input end of the first half-bridge drive module is electrically connected to the output end of a single-chip microcomputer. The output end of the single-chip microcomputer is used to output a pulse signal PWM1. The first half-bridge drive module is provided with a connection pin PIN1 and a connection pin PIN2, and the connection pin PIN1 and the connection pin PIN2 are used to be electrically connected to both ends of a proportional valve coil. The input end of the first current amplification module is electrically connected to the output end of the first half-bridge drive module, and the output end of the first current amplification module is electrically connected to the input end of the single-chip microcomputer.

[0007] By adopting the above technical solutions, by setting the first half-bridge drive module, the pulse signal PWM1 output by the single-chip microcomputer can achieve the drive function. On this basis, by setting the first current amplification module, the working state of the circuit can be monitored. By monitoring and avoiding the output current of the first half-bridge drive module, problems such as heat loss and energy waste caused by component damage or other reasons can be detected in time, and the overall performance and stability in use can be improved.

[0008] Preferably, the first half-bridge driving module includes a half-bridge driving chip U1 and its peripheral components, a first switching transistor Q1, a second switching transistor Q2, and a power supply POW. The input end of the half-bridge driving chip U1 is electrically connected to the output end of the single-chip microcomputer. The first output end of the first half-bridge driving module is electrically connected to the base of the first switching transistor Q1, and the second output end of the first half-bridge driving module is electrically connected to the base of the second switching transistor Q2. The drains of the first switching transistor Q1 and the second switching transistor Q2 are electrically connected to the positive voltage output end of the power supply POW. The source of the second switching transistor Q2 is grounded, and the source of the first switching transistor Q1 is electrically connected to the input end of the first current amplification module. The source of the first switching transistor Q1 and the drain of the second switching transistor Q2 are electrically connected to both ends of the proportional valve coil.

[0009] By adopting the above technical solution, the half-bridge driving chip U1 can ensure that the bases of the first switching transistor Q1 and the second switching transistor Q2 can obtain a sufficiently large driving voltage, so that the first switching transistor Q1 and the second switching transistor Q2 enter a deep saturation state after conduction, thereby avoiding the heating loss problem caused by insufficient base voltage of the first switching transistor Q1 and the second switching transistor Q2.

[0010] Preferably, the first half-bridge driving module further includes a freewheeling diode D2 and a freewheeling diode D3. The negative electrode of the freewheeling diode D2 is electrically connected to the source of the first switching transistor Q1, and the positive electrode of the freewheeling diode D2 is electrically connected to the negative voltage output end of the power supply POW. The negative electrode of the freewheeling diode D3 is electrically connected to the positive voltage output end of the power supply POW, and the positive electrode of the freewheeling diode D3 is electrically connected to the drain of the second switching transistor Q2.

[0011] By adopting the above technical solution, when the two switching transistors are turned off simultaneously, due to the large induced electromotive force of the coil, a large reverse electromotive force will be generated in the current of the coil. At this time, the freewheeling diodes D2 and D3 are used to release the reverse electromotive force back to the power supply POW, protecting the circuit and saving energy at the same time.

[0012] Preferably, the first current amplification module includes a current amplification chip U2 and its peripheral components. The source of the first switching transistor Q1 is electrically connected to the input end of the current amplification chip U2, and the output end of the current amplification chip U2 is electrically connected to the input end of the single-chip microcomputer.

[0013] By adopting the above technical solution, the current amplification chip U2 and its peripheral components are used to realize the amplification processing of the output current of the first half-bridge driving module.

[0014] Preferably, it further includes a jumper selection switch P1, and a first sampling resistor R4 and a second sampling resistor R5 with different resistance values; the jumper selection switch P1 is provided with a common terminal, a first selection terminal and a second selection terminal. The common terminal of the jumper selection switch P1 is electrically connected to the wiring pin PIN1 and then electrically connected to the input end of the current amplification chip U2. The first selection terminal of the jumper selection switch P1 is electrically connected to the source electrode of the first switching tube Q1 through the first sampling resistor R4, and the second selection terminal of the jumper selection switch P1 is electrically connected to the source electrode of the first switching tube Q1 through the second sampling resistor R4.

[0015] By adopting the above technical solution, the jumper selection switch P1 can be used to connect the first sampling resistor R4 or the second sampling resistor R5 according to actual needs, so as to realize different sampling current ranges.

[0016] Preferably, the first current amplification module further includes a resistor R6 and a capacitor C5. One end of the resistor R6 is electrically connected to the output end of the current amplification chip U2, the other end of the resistor R6 is grounded through the capacitor C5, and the connection point between the resistor R6 and the capacitor C5 is electrically connected to the input end of the single-chip microcomputer.

[0017] By adopting the above technical solution, the resistor R6 and the capacitor C5 can play a role in filtering and voltage stabilization, thereby improving the stability of the output signal of the first current amplification module.

[0018] Preferably, it further includes a second half-bridge drive module and a second current amplification module. The input end of the second half-bridge drive module is electrically connected to other output ends of the single-chip microcomputer, and the other output ends of the single-chip microcomputer are used to output a pulse signal PWM2. The second half-bridge drive module is provided with a wiring pin PIN3 and a wiring pin PIN4, and the wiring pin PIN3 and the wiring pin PIN4 are used to be electrically connected to both ends of the proportional valve coil; the input end of the second current amplification module is electrically connected to the output end of the second half-bridge drive module, and the output end of the second current amplification module is electrically connected to another input end of the single-chip microcomputer.

[0019] By adopting the above technical solution, the second half-bridge drive module and the second current amplification module can make this application applicable to a double-coil proportional valve, thereby improving the applicable range.

[0020] Preferably, it further includes a jumper selection switch P3 and a jumper selection switch P4. Two ends of the jumper selection switch P3 are electrically connected to the wiring pin PIN1 and the wiring pin PIN3 respectively, and two ends of the jumper selection switch P4 are electrically connected to the wiring pin PIN2 and the wiring pin PIN4 respectively; when the wiring pin PIN1 is electrically connected to the wiring pin PIN3 and the wiring pin PIN2 is electrically connected to the wiring pin PIN4, the circuit is in a full-bridge drive mode.

[0021] By adopting the above technical solution, when the wiring pin PIN1 is electrically connected to the wiring pin PIN3 and the wiring pin PIN2 is electrically connected to the wiring pin PIN4, the present application is in a full-bridge drive mode, so that it can be applied to a servo valve, further improving the scope of application.

[0022] Preferably, when the circuit is in a full-bridge drive mode, the pulse signal PWM1 and the pulse signal PWM2 are set as complementary signals.

[0023] By adopting the above technical solution, the first half-bridge drive module and the second half-bridge drive module cannot be turned on simultaneously, avoiding the occurrence of a short-circuit situation.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. Since the present application is provided with a first half-bridge drive module and a first current amplification module, it can not only drive a proportional valve, but also detect and control the working state of the circuit, enhancing the functionality and stability of the circuit.

[0026] 2. In the present application, by setting a sampling resistor and a jumper selection switch, different sampling resistance values can be selected to achieve precise control of the output current of the circuit, thereby meeting the requirements of different application scenarios and improving the flexibility and versatility of the circuit;

[0027] 3. In the full-bridge drive mode of the present application, positive and negative currents can be output to drive a positive and negative current servo valve, further enhancing the functionality and scope of application of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic block diagram of Embodiment 1 of the present application;

[0029] Figure 2 is a circuit diagram of Embodiment 1 of the present application;

[0030] Figure 3 is a schematic block diagram of Embodiment 2 of the present application;

[0031] Figure 4 is a circuit diagram of Embodiment 2 of the present application;

[0032] Figure 5 It is the circuit diagram of the jumper selection switch P4 of the jumper selection switch P3 in Embodiment 2 of the present application.

[0033] Reference numerals: 1, the first half-bridge drive module; 2, the first current amplification module; 3, the second half-bridge drive module; 4, the second current amplification module. Specific embodiments

[0034] The following will further describe the present application in detail with reference to the attached Figures 1-5 drawings.

[0035] Embodiment 1 of the present application discloses a multifunctional bridge drive circuit.

[0036] Referring to Figure 1 , a multifunctional bridge drive circuit includes a first half-bridge drive module 1 and a first current amplification module 2. The input end of the first half-bridge drive module 1 is electrically connected to the output end of a single-chip microcomputer, and the output end of the single-chip microcomputer is used for outputting a pulse signal PWM1. The output end of the first half-bridge drive module 1 is electrically connected to a proportional valve, and the output end of the first half-bridge drive module 1 is also electrically connected to the input end of the first current amplification module 2. The output end of the first current amplification module 2 is electrically connected to the input end of the single-chip microcomputer. The first current amplification module 2 is used for collecting the output current of the first half-bridge drive module 1 and performing amplification processing, so that the single-chip microcomputer can detect the overall working state.

[0037] The first half-bridge drive module 1 includes a half-bridge drive chip U1, a first switching tube Q1, and a second switching tube Q2. In this embodiment, both the first switching tube Q1 and the second switching tube Q2 are set as NMOS tubes. This embodiment also includes a power supply VO, and in this embodiment, the power supply voltage of the power supply VO is set to 10V. The voltage output end of the power supply VO is connected to pin 1 of the half-bridge drive chip U1, and pin 4 of the half-bridge drive chip U1 is grounded. The voltage output end of the power supply VO is grounded through a capacitor C1, and the capacitor C1 is used to improve the stability of the voltage output of the power supply VO. The pulse signal PWM1 is input to pin 2 of the half-bridge drive chip U1 through a resistor R1, and pin 2 of the half-bridge drive chip U1 is electrically connected to pin 3 of the half-bridge drive chip U1. The voltage output end of the power supply VO is also electrically connected to a diode D1. The positive electrode of the diode D1 is electrically connected to the voltage output end of the power supply VO, the negative electrode of the diode D1 is electrically connected to pin 8 of the half-bridge drive chip U1, and the negative electrode of the diode D1 is also electrically connected to pin 6 of the half-bridge drive chip U1 through a capacitor C2.

[0038] The 7th pin of the half-bridge drive chip U1 is electrically connected to the base of the first switching transistor Q1 through a resistor R2, and the 5th pin of the half-bridge drive chip U1 is electrically connected to the base of the second switching transistor Q2 through a resistor R3. Through the half-bridge drive chip U1, it can be ensured that the bases of the first switching transistor Q1 and the second switching transistor Q2 can obtain a sufficiently large drive voltage, so that the first switching transistor Q1 and the second switching transistor Q2 enter a deep saturation state after conduction, thereby avoiding the heating loss problem caused by insufficient base voltage of the first switching transistor Q1 and the second switching transistor Q2.

[0039] Moreover, a first sampling resistor R4 and a second sampling resistor R5 are also connected in series to the source of the first switching transistor Q1, and in this embodiment, the resistance values of the first sampling resistor R4 and the second sampling resistor R5 are different. This embodiment further includes a jumper selection switch P1, which has a common terminal, a first selection terminal, and a second selection terminal. The common terminal of the jumper selection switch P1 is set as the wiring pin PIN1 and is electrically connected to the input end of the first current amplification module 2. The first selection terminal of the jumper selection switch P1 is electrically connected to the end of the first sampling resistor R4 far from the first switching transistor Q1, and the second selection terminal of the jumper selection switch P1 is electrically connected to the end of the second sampling resistor R5 far from the first switching transistor Q1, so that the first sampling resistor R4 or the second sampling resistor R5 can be connected according to actual needs to achieve different sampling current ranges. This embodiment further includes a power supply POW, the positive voltage output terminal of the power supply POW is electrically connected to the drain of the first switching transistor Q1, and the drain of the first switching transistor Q1 is also electrically connected to the negative voltage output terminal of the power supply POW through a capacitor C3. A freewheeling diode D2 is electrically connected to the source of the first switching transistor Q1, the negative electrode of the freewheeling diode D2 is electrically connected to the source of the first switching transistor Q1, and the positive electrode of the freewheeling diode D2 is electrically connected to the negative voltage output terminal of the power supply POW. A freewheeling diode D3 is electrically connected to the drain of the second switching transistor Q2, the negative electrode of the freewheeling diode D3 is electrically connected to the positive voltage output terminal of the power supply POW, and the positive electrode of the freewheeling diode D3 is electrically connected to the drain of the second switching transistor Q2. The source of the second switching transistor Q2 is electrically connected to the negative voltage output terminal of the power supply POW, and the drain of the second switching transistor Q2 is set as the wiring pin PIN2. The wiring pin PIN1 and the wiring pin PIN2 are used to be electrically connected to both ends of the proportional valve coil.

[0040] Through the half-bridge drive chip U1, the first switching transistor Q1 and the second switching transistor Q2 can be simultaneously turned off and simultaneously turned on. When the first switching transistor Q1 and the second switching transistor Q2 are simultaneously turned off, due to the large induced electromotive force of the proportional valve coil, a large reverse electromotive force will be generated in the coil. At this time, the freewheeling diodes D2 and D3 are used to release the reverse electromotive force back to the power supply POW, protecting the circuit and saving energy at the same time.

[0041] The first current amplification module 2 includes a current amplification chip U2 and a power supply V1. The voltage output terminal of the power supply V1 is grounded through a capacitor C4. By setting the capacitor C4, the stability of the voltage output of the power supply V1 can be improved. The voltage output terminal of the power supply V1 is electrically connected to the 5th pin of the current amplification chip U2, and the 2nd pin of the current amplification chip U2 is grounded. The 3rd pin of the current amplification chip U2 is electrically connected to the 6th pin of the half-bridge drive chip U1. The 4th pin of the current amplification chip U2 is electrically connected to the source electrode of the first switching transistor Q1, and the 1st pin of the current amplification chip U2 is electrically connected to the input terminal of the single-chip microcomputer through a resistor R6, so that the sampled current can be amplified for the single-chip microcomputer to receive and process. The end of the resistor R6 far from the current amplification chip U2 is also grounded through a capacitor C5. The resistor R6 and the capacitor C5 can play a role in filtering and voltage stabilization, thereby improving the stability of the output signal of the first current amplification module 2.

[0042] The implementation principle of the multifunctional bridge drive circuit in Embodiment 1 of the present application is as follows: By setting the first half-bridge drive module 1, the first pulse signal PWM1 output by the single-chip microcomputer can drive the first switching transistor Q1 and the second switching transistor Q2. On this basis, by setting the first current amplification module 2, the working state of the circuit can be monitored by detecting the output current of the first half-bridge drive module 1, improving the overall performance and stability.

[0043] Embodiment 2 of the present application discloses another multifunctional bridge drive circuit.

[0044] Refer to Figure 3 In addition, Embodiment 2 of the present application further includes a second half-bridge drive module 3 and a second current amplification module 4. The second half-bridge drive module 3 has the same structure as the first half-bridge drive module 1 in Embodiment 1, and the second current amplification module 4 has the same structure as the first half-current amplification module in Embodiment 1. The present application is applicable to a double-coil proportional valve, and the single-chip microcomputer is electrically connected to the input terminal of the second half-bridge drive module to output a second pulse signal PWM2.

[0045] Refer to Figure 4 In addition, the second half-bridge drive module 3 includes a half-bridge drive chip U3, a third switching transistor Q3, and a fourth switching transistor Q4. The second current amplification module 4 includes a current amplification chip U4. The second half-bridge drive module 3 is provided with a wiring pin PIN3 and a wiring pin PIN4. In this embodiment, a first coil of the proportional valve is electrically connected between the wiring pin PIN1 and the wiring pin PIN2, and a second coil of the proportional valve is electrically connected between the wiring pin PIN3 and the wiring pin PIN4.

[0046] Refer to Figure 5, the embodiment of the present application further includes a jumper selection switch P3 and a jumper selection switch P4. The two ends of the jumper selection switch P3 are electrically connected to the wiring pin PIN1 and the wiring pin PIN3 respectively, and the two ends of the jumper selection switch P4 are electrically connected to the wiring pin PIN2 and the wiring pin PIN4 respectively. When the wiring pin PIN1 is electrically connected to the wiring pin PIN3, and the wiring pin PIN2 and the wiring pin PIN4 are electrically connected, the present embodiment is in the full-bridge drive mode, so that a servo valve that requires positive and negative current control can be driven. At the same time, at this time, the microcontroller is controlled to make the pulse signal PWM1 and the pulse signal PWM2 complementary signals, that is, the first half-bridge drive module 1 and the second half-bridge drive module 3 cannot be turned on simultaneously, avoiding the occurrence of a short-circuit situation.

[0047] The implementation principle of the multifunctional bridge drive circuit in Embodiment 2 of the present application is as follows: By adding the second half-bridge drive module 3 and the second current amplification module 4, the present application can meet the drive requirements of a double-coil proportional valve. Further, by adding the jumper selection switch P3 and the jumper selection switch P4, the circuit is configured as a full-bridge drive circuit. In the full-bridge drive mode, the present application can output positive and negative currents to drive a positive and negative current servo valve, further enhancing the functionality and application range of the circuit, enabling it to meet the drive requirements of more types of proportional valves.

[0048] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A multifunctional bridge drive circuit, characterized in that: It includes a first half-bridge drive module (1) and a first current amplification module (2). The input end of the first half-bridge drive module (1) is electrically connected to the output end of a single-chip microcomputer. The output end of the single-chip microcomputer is used to output a pulse signal PWM1. The first half-bridge drive module (1) is provided with a wiring pin PIN1 and a wiring pin PIN2, and the wiring pin PIN1 and the wiring pin PIN2 are used to be electrically connected to both ends of a proportional valve coil. The input end of the first current amplification module (2) is electrically connected to the output end of the first half-bridge drive module (1), and the output end of the first current amplification module (2) is electrically connected to the input end of the single-chip microcomputer.

2. The multifunctional bridge drive circuit according to claim 1, wherein: The first half-bridge drive module (1) includes a half-bridge drive chip U1 and its peripheral components, a first switch tube Q1, a second switch tube Q2, and a power supply POW. The input end of the half-bridge drive chip U1 is electrically connected to the output end of the single-chip microcomputer. The first output end of the first half-bridge drive module (1) is electrically connected to the base of the first switch tube Q1, and the second output end of the first half-bridge drive module (1) is electrically connected to the base of the second switch tube Q2. The drains of the first switch tube Q1 and the second switch tube Q2 are electrically connected to the positive voltage output end of the power supply POW. The source of the second switch tube Q2 is grounded, and the source of the first switch tube Q1 is electrically connected to the input end of the first current amplification module (2), and the source of the first switch tube Q1 and the drain of the second switch tube Q2 are electrically connected to both ends of the proportional valve coil.

3. The multifunctional bridge drive circuit according to claim 2, characterized in that: The first half-bridge drive module (1) further includes a freewheeling diode D2 and a freewheeling diode D3. The negative electrode of the freewheeling diode D2 is electrically connected to the source of the first switch tube Q1, and the positive electrode of the freewheeling diode D2 is electrically connected to the negative voltage output end of the power supply POW. The negative electrode of the freewheeling diode D3 is electrically connected to the positive voltage output end of the power supply POW, and the positive electrode of the freewheeling diode D3 is electrically connected to the drain of the second switch tube Q2.

4. A multifunctional bridge drive circuit according to claim 2 or 3, characterized in that: The first current amplification module (2) includes a current amplification chip U2 and its peripheral components. The source of the first switch tube Q1 is electrically connected to the input end of the current amplification chip U2, and the output end of the current amplification chip U2 is electrically connected to the input end of the single-chip microcomputer.

5. The multifunctional bridge drive circuit according to claim 4, wherein: It further includes a jumper selection switch P1, and a first sampling resistor R4 and a second sampling resistor R5 with different resistance values. The jumper selection switch P1 is provided with a common terminal, a first selection terminal, and a second selection terminal. The common terminal of the jumper selection switch P1 is electrically connected to the wiring pin PIN1 and electrically connected to the input end of the current amplification chip U2. The first selection terminal of the jumper selection switch P1 is electrically connected to the source of the first switch tube Q1 through the first sampling resistor R4, and the second selection of the jumper selection switch P1 is electrically connected to the source of the first switch tube Q1 through the second sampling resistor R4.

6. A multifunctional bridge drive circuit according to claim 4, characterized in that: The first current amplification module (2) further includes a resistor R6 and a capacitor C5. One end of the resistor R6 is electrically connected to the output end of the current amplification chip U2, the other end of the resistor R6 is grounded through the capacitor C5, and the connection point between the resistor R6 and the capacitor C5 is electrically connected to the input end of the single-chip microcomputer.

7. A multi-functional bridge drive circuit according to claim 1, characterized in that: It further includes a second half-bridge drive module (3) and a second current amplification module (4). The input end of the second half-bridge drive module (3) is electrically connected to other output ends of the single-chip microcomputer. The other output ends of the single-chip microcomputer are used to output a pulse signal PWM2. The second half-bridge drive module (3) is provided with a wiring pin PIN3 and a wiring pin PIN4, and the wiring pin PIN3 and the wiring pin PIN4 are used to be electrically connected to both ends of the proportional valve coil; the input end of the second current amplification module (4) is electrically connected to the output end of the second half-bridge drive module (3), and the output end of the second current amplification module (4) is electrically connected to another input end of the single-chip microcomputer.

8. The multifunctional bridge drive circuit according to claim 7, characterized in that: It further includes a jumper selection switch P3 and a jumper selection switch P4. Both ends of the jumper selection switch P3 are respectively electrically connected to the wiring pin PIN1 and the wiring pin PIN3, and both ends of the jumper selection switch P4 are respectively electrically connected to the wiring pin PIN2 and the wiring pin PIN4; when the wiring pin PIN1 is electrically connected to the wiring pin PIN3, and the wiring pin PIN2 and the wiring pin PIN4 are electrically connected, the circuit is in a full-bridge drive mode.

9. A multifunctional bridge drive circuit according to claim 8, characterized in that: When the circuit is in the full-bridge drive mode, the pulse signal PWM1 and the pulse signal PWM2 are set as complementary signals.

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