H-bridge driving circuit of MOS (Metal Oxide Semiconductor) tube
By using PMOS transistors in the H-bridge circuit and combining them with pull-up and push-pull modules, the problem of complex driving of NMOS transistors in the upper bridge arm was solved, enabling low-voltage fast charging and discharging, improving switching speed and reducing costs.
Patent Information
- Application Number
- CN202520446806.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-14
AI Technical Summary
In traditional H-bridge drive circuits, the driving of the upper arm NMOS transistor is complex and requires a high-voltage drive circuit, which leads to an increase in the number of electronic components and cost.
By replacing the upper bridge arm with a PMOS transistor and enhancing the gate drive capability of the PMOS transistor through pull-up and push-pull modules, fast charging and discharging can be achieved with a lower voltage, reducing conduction losses and avoiding high-voltage drive circuits.
This improves the switching speed of PMOS transistors, reduces conduction losses, and decreases the number of electronic components and production costs.
Smart Images
Figure CN223957442U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of power electronics, specifically, a MOS tube H bridge drive circuit. BACKGROUND
[0002] At present, H bridge drive circuit is widely used in motor drive, power conversion, electronic load switch and other fields, and its core function is to realize current direction switching and load power regulation through the conduction state of electronic components in the circuit. The traditional H bridge drive circuit usually adopts four NMOS tubes to form a bridge arm structure, wherein the drive of the NMOS tube of the lower half bridge is relatively simple and can be directly controlled by the output of the drive chip; however, the drive of the NMOS tube of the upper half bridge is relatively complicated. Since the conduction of the NMOS tube requires the voltage of the gate and the source to be higher than the threshold voltage of the NMOS tube, when the NMOS is arranged in the upper bridge arm, the source voltage is floating between the power supply voltage and the ground with the load switching, and if the NMOS tube of the upper bridge arm is to be completely turned on, the gate drive voltage of the upper bridge arm NMOS tube needs to be higher than the sum of the power supply voltage and the threshold voltage of the upper bridge arm NMOS tube, but the logic level output by the conventional drive chip cannot meet this requirement, so a relatively complex high-voltage drive circuit is needed to drive the upper bridge arm NMOS tube to be turned on, resulting in an increase in the number and cost of electronic components. SUMMARY
[0003] In view of the deficiencies of the prior art, the utility model provides a MOS tube H bridge drive circuit,
[0004] The utility model discloses a MOS tube H bridge drive circuit, which comprises a control circuit, a drive circuit, an output circuit and a power supply DC.
[0005] The utility model discloses a MOS tube H bridge drive circuit, which comprises a control circuit, a drive circuit, an output circuit and a power supply DC.
[0006] In one embodiment, the pull-up module includes NMOS Q3 and NMOS Q4, which have gate G, source S and drain D, respectively. The gate G of NMOS Q3 and NMOS Q4 is electrically connected to the control circuit, respectively. The source S of NMOS Q3 and NMOS Q4 is grounded. The drain D of NMOS Q3 and NMOS Q4 is electrically connected to the current limiting module and the control circuit, respectively.
[0007] In one embodiment, the current limiting module includes resistor R24, resistor R25, resistor R31 and resistor R26, which have No. 1 terminal and No. 2 terminal, respectively. The No. 1 terminal of resistor R24 is electrically connected to the control circuit and the pull-up module, respectively. The No. 2 terminal of resistor R24 is electrically connected to the push-pull module and the No. 1 terminal of resistor R25, respectively. The No. 1 terminal and No. 2 terminal of resistor R25 are electrically connected to the push-pull module, respectively. The No. 1 terminal of resistor R31 is electrically connected to the control circuit and the pull-up module, respectively. The No. 2 terminal of resistor R31 is electrically connected to the push-pull module and the No. 1 terminal of resistor R26, respectively. The No. 1 terminal and No. 2 terminal of resistor R26 are electrically connected to the push-pull module, respectively.
[0008] In one embodiment, the push-pull module includes transistor Q5, transistor Q6, transistor Q11, transistor Q12, resistor R32 and resistor R33, which have base B, collector C and emitter E, respectively. The No. 1 terminal and No. 2 terminal of resistor R32 and resistor R33 are electrically connected to the push-pull module, respectively. The base B of transistor Q5 is electrically connected to the current limiting module and the base B of transistor Q6, respectively. The collector C of transistor Q5 is electrically connected to the current limiting module, the upper bridge arm and the power supply DC, respectively. The emitter E of transistor Q5 is electrically connected to the No. 1 terminal of resistor R32 and the upper bridge arm, respectively. The base B of transistor Q6 is electrically connected to the current limiting module. The collector C of transistor Q6 is electrically connected to the lower bridge arm and the control circuit, respectively. The emitter E of transistor Q6 is electrically connected to the No. 2 terminal of resistor R32. The base B of transistor Q11 is electrically connected to the current limiting module and the base B of transistor Q12, respectively. The collector C of transistor Q11 is electrically connected to the current limiting module, the upper bridge arm and the power supply DC, respectively. The emitter E of transistor Q11 is electrically connected to the No. 1 terminal of resistor R33 and the upper bridge arm, respectively. The base B of transistor Q12 is electrically connected to the current limiting module. The collector C of transistor Q12 is electrically connected to the lower bridge arm and the control circuit, respectively. The emitter E of transistor Q12 is electrically connected to the No. 2 terminal of resistor R33.
[0009] In one of the embodiments, the control circuit comprises a control chip, a current limiting resistor, a filter capacitor and a protection diode, the control chip has 1-8 ports, the No.1 port of the control chip is electrically connected with the current limiting resistor, the filter capacitor and the protection diode respectively, the No.2 port of the control chip is electrically connected with the current limiting resistor, the filter capacitor and the protection diode respectively, the No.3 port of the control chip is electrically connected with the power supply DC and the filter capacitor respectively, the No.4 port of the control chip is grounded, the No.5 port of the control chip is electrically connected with the current limiting resistor and the filter capacitor respectively, the No.6 port of the control chip is electrically connected with the current limiting resistor and the filter capacitor respectively, the No.7 port of the control chip is electrically connected with the pull-up module, and the No.8 port of the control chip is electrically connected with the pull-up module; the current limiting resistor is electrically connected with the lower bridge arm and the protection diode respectively, and the current limiting resistor is grounded; the filter capacitor is electrically connected with the current limiting resistor, the protection diode and the power supply DC respectively; and the protection diode is electrically connected with the pull-up module.
[0010] In one of the embodiments, the current limiting resistor comprises a resistor R28, a resistor R29, a resistor R30, a resistor R34, a resistor R35, a resistor R37, a resistor R38, a resistor R39 and a resistor R40, the resistor R28, the resistor R29, the resistor R30, the resistor R31, the resistor R34, the resistor R35, the resistor R37, the resistor R38, the resistor R39 and the resistor R40 have No.1 port and No.2 port respectively, the No.1 port of the resistor R28 is electrically connected with the control chip, the filter capacitor and the protection diode respectively, the No.2 port of the resistor R28 is electrically connected with the No.1 port of the resistor R29, the No.2 port of the resistor R34 and the No.1 port of the resistor R37 respectively; the No.1 port of the resistor R29 is electrically connected with the No.2 port of the resistor R34 and the No.1 port of the resistor R37 respectively, and the No.2 port of the resistor R29 is grounded; the No.1 port of the resistor R30 is electrically connected with the control chip, the filter capacitor and the protection diode respectively, the No.2 port of the resistor R30 is electrically connected with the No.1 port of the resistor R35 and the No.1 port of the resistor R38 respectively; the No.1 port of the resistor R34 is electrically connected with the control chip and the filter capacitor respectively, and the No.2 port of the resistor R34 is electrically connected with the No.1 port of the resistor R37; the No.2 port of the resistor R35 is electrically connected with the lower bridge arm; the No.2 port of the resistor R37 is electrically connected with the lower bridge arm; the No.1 port of the resistor R38 is electrically connected with the No.1 port of the resistor R35, and the No.2 port of the resistor R38 is grounded; the resistor R39 is connected with the filter capacitor in parallel, the No.1 port of the resistor R39 is grounded, the No.2 port of the resistor R39 is electrically connected with the No.1 port of the resistor R40; and the No.2 port of the resistor R40 is electrically connected with the push-pull circuit and the lower bridge arm respectively.
[0011] In one of the embodiments, the filter capacitor comprises a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15 and a capacitor C17, the capacitor C12, the capacitor C13, the capacitor C14, the capacitor C15 and the capacitor C17 have a No. 1 terminal and a No. 2 terminal respectively, the No. 1 terminal of the capacitor C12 is electrically connected with the current-limiting resistor, the control chip and the protection diode respectively, the No. 2 terminal of the capacitor C12 is electrically connected with the No. 2 terminal of the capacitor C13, and the No. 2 terminal of the capacitor C12 is grounded; the No. 1 terminal of the capacitor C13 is electrically connected with the current-limiting resistor, the control chip and the protection diode respectively, and the No. 2 terminal of the capacitor C13 is grounded; the No. 1 terminal of the capacitor C14 is electrically connected with the control chip and the power supply DC respectively, the No. 2 terminal of the capacitor C14 is electrically connected with the No. 1 terminal of the capacitor C15 and the current-limiting resistor respectively, and the No. 2 terminal of the capacitor C14 is grounded; the No. 1 terminal and the No. 2 terminal of the capacitor C15 are connected in parallel with the current-limiting resistor, the No. 1 terminal of the capacitor C15 is grounded, and the No. 2 terminal of the capacitor C15 is electrically connected with the control chip and the current-limiting resistor respectively; the No. 1 terminal of the capacitor C17 is electrically connected with the control chip and the current-limiting resistor respectively, and the No. 2 terminal of the capacitor C17 is grounded.
[0012] In one of the embodiments, the protection diode comprises a diode D10 and a diode D11, the diode D10 and the diode D11 have a No. 1 terminal and a No. 2 terminal, the No. 1 terminal of the diode D10 is electrically connected with the control chip, the current-limiting resistor and the filter capacitor respectively, the No. 2 terminal of the diode D10 is electrically connected with the pull-up module and the current-limiting module respectively; the No. 1 terminal of the diode D11 is electrically connected with the control chip, the current-limiting resistor and the filter capacitor respectively, and the No. 2 terminal of the diode D11 is electrically connected with the pull-up module and the current-limiting module respectively.
[0013] In one of the embodiments, the output circuit further comprises a capacitor C1, a capacitor C2 and a resistor R36, the capacitor C1 and the capacitor C2 have a No. 1 terminal and a No. 2 terminal respectively, the No. 1 terminal and the No. 2 terminal of the capacitor C1 and the capacitor C2 are connected in parallel respectively, the No. 1 terminal of the capacitor C1 and the capacitor C2 connected in parallel is electrically connected with the power supply DC and the upper bridge arm respectively, and the No. 2 terminal of the capacitor C1 and the capacitor C2 connected in parallel is grounded; the resistor R36 has a No. 1 terminal and a No. 2 terminal, the No. 1 terminal of the resistor R36 is electrically connected with the lower bridge arm, and the No. 2 terminal of the resistor R36 is grounded.
[0014] Compared with the prior art, the utility model has at least the following advantages:
[0015] The utility model discloses a PMOS tube is used to the upper bridge arm of H bridge circuit, and uses the pull-up module and push -pull module to enhance the gate drive ability of PMOS tube, can thus ensure PMOS tube gate quick charge -discharge through lower voltage, improves the switching speed of PMOS tube and reduces the conduction loss, avoids using high -voltage drive circuit, simultaneously, the use cost of PMOS tube is lower than NMOS tube, thereby reduces the quantity and production cost of electronic component. BRIEF DESCRIPTION OF DRAWINGS
[0016] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
[0017] Figure 1 The utility model discloses a MOS tube H bridge drive circuit,
[0018] Among them, the sign is, 1. Control circuit;11. Control chip;2 drive circuit;21. Upper pull module;22. Current -limiting module;23. Push -pull module;3 output circuit;31. H bridge circuit;311. Upper bridge arm;312. Lower bridge arm. DETAILED DESCRIPTION
[0019] The following will disclose a plurality of embodiments of the utility model with drawings, for the purpose of clear description, many practical details will be described in the following. However, it should be appreciated that these practical details should not be used to limit the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. In addition, for the purpose of simplifying the drawing, some conventional structures and components will be drawn in a simple schematic way in the drawing.
[0020] It should be noted that all directional indications such as upper, lower, left, right, front, rear, etc. in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture, such as shown in the drawing, if the specific posture changes, the directional indications will also change accordingly.
[0021] In addition, the description such as "first", "second" in the utility model is only for the purpose of description, not the meaning of special order or sequence, nor is it used to limit the utility model, it is only for the purpose of distinguishing components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.
[0022] In order to further understand the utility model content, characteristics and effects of the utility model, the following examples are given, and the detailed description is as follows in conjunction with the drawings:
[0023] As Figure 1 shown, Figure 1The application discloses a MOS tube H-bridge driving circuit which comprises a control circuit 1, a driving circuit 2, an output circuit 3 and a power supply DC. The control circuit 1 is electrically connected with the driving circuit 2, the output circuit 3 and the power supply DC respectively, the driving circuit 2 is electrically connected with the output circuit 3 and the power supply DC respectively, and the output circuit 3 is electrically connected with the power supply DC. In the specific operation, the output circuit 3 is electrically connected with an electric device and the power supply DC, the control circuit 1 is powered by the power supply DC, a signal instruction is sent from the control circuit 1 to the driving circuit 2, the driving circuit 2 can drive the output circuit 3 to work, and the electric device is outputted with electric energy.
[0024] Specifically, the driving circuit 2 comprises a pull-up module 21, a current-limiting module 22 and a push-pull module 23. The pull-up module 21 is electrically connected with the control circuit 1 and the current-limiting module 22 respectively, and the pull-up module 21 is grounded. The current-limiting module 22 is electrically connected with the push-pull module 23. The push-pull module 23 is electrically connected with the output circuit 3 and the power supply DC respectively. The current-limiting module 22 plays a role of current-limiting protection for the pull-up module 21 and the push-pull module 23, and prevents the pull-up module 21 and the push-pull module 23 from being damaged. It should be noted that, in the specific operation, after the pull-up module 21 receives the driving signal sent from the control circuit 1, the pull-up module 21 can pull up the level of the driving signal, thereby improving the level of the driving signal. After the level of the driving signal is pulled up, the driving signal is outputted to the push-pull module 23 to make the push-pull module 23 work, and the dynamic enhancement driving capacity of the push-pull module 23 is used to make the output circuit output electric energy to the electric device.
[0025] Specifically, the output circuit 3 comprises an H-bridge circuit 31, the H-bridge circuit 31 comprises an upper bridge arm 311 composed of two PMOS tubes and a lower bridge arm 312 composed of two NMOS tubes, the upper bridge arm 311 is electrically connected with the lower bridge arm 312, the current limiting module 22, the push-pull module 23 and the power supply DC respectively, and the lower bridge arm 312 is electrically connected with the push-pull module 23 and the control circuit 1 respectively. It should be noted that the two PMOS tubes comprise Q5 and Q11, and the two NMOS tubes comprise Q8 and Q10, and the PMOS tube Q5, the PMOS tube Q11, the NMOS tube Q8 and the NMOS tube Q10 have a gate G, a source S and a drain D respectively. Among them, the gates G of the two PMOS tubes Q5 and Q11 are electrically connected with the push-pull module 23 respectively, the sources S of the two PMOS tubes Q5 and Q11 are electrically connected with the push-pull module 23 and the power supply DC respectively, and the drains D of the two PMOS tubes Q5 and Q11 are electrically connected with the drains D of the NMOS tubes Q8 and Q10; the gates G of the two NMOS tubes Q8 and Q10 are electrically connected with the control circuit 1, and the sources S of the two NMOS tubes Q8 and Q10 are electrically connected with the control circuit 1 and the push-pull module 23 respectively. In the specific work, the pull-up module 21 pulls up the level signal transmitted by the control circuit and transmits it to the push-pull module 23, and the PMOS tube Q7 of the upper bridge arm 311 is quickly turned on through the high driving capacity of the push-pull module 23, and at the same time the NMOS tube Q10 of the lower bridge arm can be directly turned on through the level signal sent by the control circuit 1, so that the H-bridge circuit can provide power for the connected electrical equipment; the conduction principle of the PMOS tube Q9 and the NMOS tube Q8 is the same as that of the PMOS tube Q7 and the NMOS tube Q10, which will not be described here. In actual production operation, for example, the H-bridge circuit 31 can realize the forward and reverse speed regulation and control of the motor.
[0026] Specifically, the pull-up module 21 comprises an NMOS tube Q3 and an NMOS tube Q4, the NMOS tube Q3 and the NMOS tube Q4 have a gate G, a source S and a drain D respectively, the gates G of the NMOS tube Q3 and the NMOS tube Q4 are electrically connected with the control circuit 1 and the output circuit 3 respectively, the sources S of the NMOS tube Q3 and the NMOS tube Q4 are grounded, and the drains D of the NMOS tube Q3 and the NMOS tube Q4 are electrically connected with the current limiting module 22 and the control circuit 1 respectively. Among them, the conduction of the NMOS tube requires that the gate voltage be higher than the source voltage, since the sources S of the NMOS tube Q3 and the NMOS tube Q4 are grounded, the voltages of the gates G of the NMOS tube Q3 and the NMOS tube Q4 are greater than those of the sources S, when the NMOS tube Q3 and the NMOS tube Q4 are turned on, a low resistance path is formed between the drain D and the source S, and the potential of the drain can be pulled up.
[0027] Specifically, the current limiting module 22 includes resistors R24, R25, R31 and R26, the resistors R24, R25, R31 and R26 have No. 1 end and No. 2 end respectively, the No. 1 end of the resistor R24 is electrically connected with the control circuit 1 and the pull-up module 21 respectively, the No. 2 end of the resistor R24 is electrically connected with the push-pull module 23 and the No. 1 end of the resistor R25 respectively; the No. 1 end and the No. 2 end of the resistor R25 are electrically connected with the push-pull module 23 respectively; the No. 1 end of the resistor R31 is electrically connected with the control circuit 1 and the pull-up module 21 respectively, the No. 2 end of the resistor R31 is electrically connected with the push-pull module 23 and the No. 1 end of the resistor R26 respectively; the No. 1 end and the No. 2 end of the resistor R26 are electrically connected with the push-pull module 23 respectively. Among them, the resistors R24, R25, R31 and R26 can protect the push-pull module 23, prevent the current input to the push-pull module 23 from being too large, and avoid damage to the push-pull module 23.
[0028] Specifically, the push-pull module 23 comprises a triode Q5, a triode Q6, a triode Q11, a triode Q12, a resistor R32 and a resistor R33, the triode Q5, the triode Q6, the triode Q11 and the triode Q12 each have a base B, a collector C and an emitter E, the resistor R32 and the resistor R33 each have a No. 1 terminal and a No. 2 terminal, the base B of the triode Q5 is electrically connected with the current limiting module 22 and the base B of the triode Q6, the collector C of the triode Q5 is electrically connected with the current limiting module 22, the upper bridge arm 311 and the power supply DC respectively, and the emitter E of the triode Q5 is electrically connected with the No. 1 terminal of the resistor R32 and the upper bridge arm 311 respectively; the base B of the triode Q6 is electrically connected with the current limiting module 22, the collector C of the triode Q6 is electrically connected with the lower bridge arm 312 and the control circuit 1 respectively, and the emitter E of the triode Q6 is electrically connected with the No. 2 terminal of the resistor R32; the base B of the triode Q11 is electrically connected with the current limiting module 22 and the base B of the triode Q12 respectively, the collector C of the triode Q11 is electrically connected with the current limiting module 22, the upper bridge arm 311 and the power supply DC respectively, and the emitter E of the triode Q11 is electrically connected with the No. 1 terminal of the resistor R33 and the upper bridge arm 311 respectively; the base B of the triode Q12 is electrically connected with the current limiting module 22, the collector C of the triode Q12 is electrically connected with the lower bridge arm 312 and the control circuit 1 respectively, and the emitter E of the triode Q12 is electrically connected with the No. 2 terminal of the resistor R33. Among them, the resistor R32 is arranged between the triode Q5 and the triode Q6, which can prevent the triode Q5 and the triode Q6 from being simultaneously turned on in the switching process, avoid the formation of a low resistance path between the power supply DC and the ground, and produce a straight-through current to damage the triode Q5 and the triode Q6. Thus, the conduction time of one of the triodes is delayed, and simultaneous conduction is avoided. The resistor R33 has the same function as the resistor R32, which will not be described here. In specific work, taking the triode Q5 and the triode Q6 as an example, when the control circuit 1 outputs a high-level signal through the NMOS tube Q3 to pull up the level signal, the pulled-up level signal is input to the base B of the triode Q5, the triode Q5 is turned on, the voltage output from the emitter E of the triode Q5 is pulled up to the voltage of the power supply DC, and input to the gate of the PMOS tube Q7, so that the PMOS tube Q7 is turned on. At this time, the NMOS tube is turned on by the control signal of the control circuit 1, and outputs power to the connected electrical equipment; when the control circuit 1 outputs a low-level signal, the triode Q5 will be cut off, the triode Q6 is turned on, the gate voltage of the PMOS tube Q7 is pulled down, and the PMOS tube Q7 will be cut off. At this time, the NMOS tube Q8 is turned on by the output signal of the control circuit 1, and at the same time, the PMOS tube Q9 is turned on in the same way as the PMOS tube Q7. Finally, the PMOS tube Q7 and the NMOS tube Q10, and the PMOS tube Q9 and the NMOS tube Q8 achieve the effect of alternating conduction. The push-pull module 23 is used to drive the gate G of the PMOS tube Q7 and the PMOS tube Q9 to ensure that they are quickly turned on and turned off.The working principle of the triode Q11 and the triode Q12 is the same as that of the triode Q5 and the triode Q6, which will not be repeated here.
[0029] Further, the control circuit 1 comprises a control chip 11, a current-limiting resistor 12, a filter capacitor 13 and a protection diode 14, the control chip 11 has 1-8 ports, the No. 1 port of the control chip 11 is electrically connected with the current-limiting resistor 12, the filter capacitor 13 and the protection diode 14 respectively, the No. 2 port of the control chip 11 is electrically connected with the current-limiting resistor 12, the filter capacitor 13 and the protection diode 14 respectively, the No. 3 port of the control chip 11 is electrically connected with the power supply DC and the filter capacitor 13 respectively, the No. 4 port of the control chip 11 is grounded, the No. 5 port of the control chip 11 is electrically connected with the current-limiting resistor 12 and the filter capacitor 13 respectively, the No. 6 port of the control chip 11 is electrically connected with the current-limiting resistor 12 and the filter capacitor 13 respectively, the No. 7 port of the control chip 11 is electrically connected with the pull-up module 21, and the No. 8 port of the control chip 11 is electrically connected with the pull-up module 21; the current-limiting resistor 12 is electrically connected with the lower bridge arm 312 and the protection diode 14 respectively, and the current-limiting resistor 12 is grounded; the filter capacitor 13 is electrically connected with the current-limiting resistor 12, the protection diode 14 and the power supply DC respectively; the protection diode 14 is electrically connected with the pull-up module 21. Among them, the control chip 11 adopts the CMOS level conversion chip of JL233B, the current-limiting resistor 12 prevents the current in the circuit from being too large to avoid damaging the circuit elements; the filter capacitor 13 can filter out the power supply noise, better making the direct current voltage in the circuit more pure; the protection diode 14 can ensure one-way transmission of the level signal and prevent signal backflow.
[0030] Specifically, the current-limiting resistor 12 includes resistors R28, R29, R30, R34, R35, R37, R38, R39 and R40, each of which has a No. 1 terminal and a No. 2 terminal. The No. 1 terminal of the resistor R28 is electrically connected to the control chip 11, the filter capacitor 13 and the protection diode 14, respectively. The No. 2 terminal of the resistor R28 is electrically connected to the No. 1 terminal of the resistor R29, the No. 2 terminal of the resistor R34 and the No. 1 terminal of the resistor R37, respectively. The No. 1 terminal of the resistor R29 is electrically connected to the No. 2 terminal of the resistor R34 and the No. 1 terminal of the resistor R37, respectively. The No. 2 terminal of the resistor R29 is grounded. The No. 1 terminal of the resistor R30 is electrically connected to the control chip 11, the filter capacitor 13 and the protection diode 14, respectively. The No. 2 terminal of the resistor R30 is electrically connected to the No. 1 terminal of the resistor R35 and the No. 1 terminal of the resistor R38, respectively. The No. 1 terminal of the resistor R34 is electrically connected to the control chip 11 and the filter capacitor 13, respectively. The No. 2 terminal of the resistor R34 is electrically connected to the No. 1 terminal of the resistor R37. The No. 2 terminal of the resistor R35 is electrically connected to the lower bridge arm 312. The No. 2 terminal of the resistor R37 is electrically connected to the lower bridge arm 312. The No. 1 terminal of the resistor R38 is electrically connected to the No. 1 terminal of the resistor R35. The No. 2 terminal of the resistor R38 is grounded. The resistor R39 is connected in parallel with the filter capacitor 13. The No. 1 terminal of the resistor R39 is grounded. The No. 2 terminal of the resistor R39 is electrically connected to the No. 1 terminal of the resistor R40. The No. 2 terminal of the resistor R40 is electrically connected to the push-pull circuit 23 and the lower bridge arm 312, respectively. Among them, the resistors R28, R29, R30, R31, R34, R35, R37, R38, R39 and R40 limit the current in the circuit to prevent damage to the elements in the circuit caused by excessive current.
[0031] Specifically, the filter capacitor 13 includes a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15 and a capacitor C17, the capacitor C12, the capacitor C13, the capacitor C14, the capacitor C15 and the capacitor C17 have a No. 1 terminal and a No. 2 terminal respectively, the No. 1 terminal of the capacitor C12 is electrically connected with the current-limiting resistor 12, the control chip 11 and the protection diode 14 respectively, the No. 2 terminal of the capacitor C12 is electrically connected with the No. 2 terminal of the capacitor C13, and the No. 2 terminal of the capacitor C12 is grounded; the No. 1 terminal of the capacitor C13 is electrically connected with the current-limiting resistor 12, the control chip 11 and the protection diode 14 respectively, and the No. 2 terminal of the capacitor C13 is grounded; the No. 1 terminal of the capacitor C14 is electrically connected with the control chip 11 and the power supply DC respectively, the No. 2 terminal of the capacitor C14 is electrically connected with the No. 1 terminal of the capacitor C15 and the current-limiting resistor 12 respectively, and the No. 2 terminal of the capacitor C14 is grounded; the No. 1 terminal and the No. 2 terminal of the capacitor C15 are connected in parallel with the current-limiting resistor 12, the No. 1 terminal of the capacitor C15 is grounded, and the No. 2 terminal of the capacitor C15 is electrically connected with the control chip 11 and the current-limiting resistor 12 respectively; the No. 1 terminal of the capacitor C17 is electrically connected with the control chip 11 and the current-limiting resistor 12 respectively, and the No. 2 terminal of the capacitor C17 is grounded. Among them, the capacitor C12, the capacitor C13, the capacitor C14, the capacitor C15 and the capacitor C17 play a filtering role in the circuit, the capacitor C14 acts as a decoupling capacitor to filter the input power supply DC, keeping the input DC voltage pure; the capacitor C12, the capacitor C13, the capacitor C15 and the capacitor C17 act as bypass capacitors to filter high-frequency noise on the signal line and prevent noise interference on the subsequent circuit.
[0032] Specifically, the protection diode 14 includes a diode D10 and a diode D11, the diode D10 and the diode D11 have a No. 1 terminal and a No. 2 terminal, the No. 1 terminal of the diode D10 is electrically connected with the control chip 11, the current-limiting resistor 12 and the filter capacitor 13 respectively, and the No. 2 terminal of the diode D10 is electrically connected with the pull-up module 21 and the current-limiting module 22 respectively; the No. 1 terminal of the diode D11 is electrically connected with the control chip 11, the current-limiting resistor 12 and the filter capacitor 13 respectively, and the No. 2 terminal of the diode D11 is electrically connected with the pull-up module 21 and the current-limiting module 22 respectively. Among them, the diode D10 and the diode D11 make the level signal output by the control chip 11 unidirectional transmission, preventing signal backflow.
[0033] Preferably, the output circuit 3 further comprises a capacitor C1 and a capacitor C2, the capacitor C1 and the capacitor C2 each have a No. 1 terminal and a No. 2 terminal, the No. 1 terminal and the No. 2 terminal of the capacitor C1 and the capacitor C2 are connected in parallel, the No. 1 terminal of the capacitor C1 and the capacitor C2 connected in parallel is electrically connected with the power supply DC and the upper bridge arm 311 respectively, and the No. 2 terminal of the capacitor C1 and the capacitor C2 connected in parallel is grounded; and the output circuit 3 further comprises a resistor R36, the resistor R36 has a No. 1 terminal and a No. 2 terminal, the No. 1 terminal of the resistor R36 is electrically connected with the lower bridge arm 312, and the No. 2 terminal of the resistor R36 is grounded. Among them, the capacitor C1 and the capacitor C2 filter the input power supply DC to avoid the voltage output from the output circuit 3 having more noise; and the resistor R36 is connected in series with the ground at the lower bridge arm 312, thereby increasing the damping and inhibiting oscillation.
[0034] In summary, the MOS tube H-bridge driving circuit of the utility model in the specific work, the output circuit 3 is electrically connected with the electric equipment, and the output circuit is connected with the power supply DC;
[0035] When the No. 7 terminal of the control chip 11 outputs a high level signal to the NMOS tube Q3, a low resistance path is formed between the drain D and the source S of the NMOS tube Q3, so that the potential of the drain D is pulled up to the voltage of the power supply DC, and through the push-pull module 23 composed of the triode Q5, the resistor R32 and the triode Q6, the bidirectional pushing ability of the push-pull module is used to quickly turn on the PMOS tube Q7 of the upper bridge arm 311, and at the same time, the NMOS tube Q10 can be directly controlled to turn on by the control chip 11 sending a PWM signal. Thus, the power supply DC outputs a current to the electric equipment through the PMOS tube Q7, and a loop is formed from the NMOS tube Q10 to the ground, so that the electric equipment works; when the No. 7 terminal of the control chip 11 outputs a low level signal to the NMOS tube Q3, the NMOS tube Q3 is cut off, and the voltage output by the push-pull module 23 is pulled down, so that the PMOS tube Q7 is cut off. At the same time, when the No. 8 terminal of the control chip 11 outputs a high level signal to the NMOS tube Q4, the NMOS tube Q4 is turned on, the push-pull module 23 composed of the triode Q11, the resistor R33 and the triode Q12 is used to quickly turn on the PMOS tube Q9 of the upper bridge arm 311, and the control chip 11 sends a PWM signal to control the NMOS tube Q8 to turn on. Thus, the current loop from the PMOS tube Q7 to the electric equipment to the NMOS tube Q10 becomes the PMOS tube Q9 to the electric equipment to the NMOS tube Q8, so that the output of the H-bridge circuit 31 is switched. For example, the positive and negative rotation of the motor can be switched by changing the direction of the output of the H-bridge circuit 31.
[0036] The above merely illustrates the implementation modes of the present application and is not used to limit the present application. The present application can be changed and modified in various ways for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims
1. A MOS tube H-bridge driving circuit, characterized in that, The application relates to a control circuit (1), a driving circuit (2), an output circuit (3) and a power supply DC, wherein the control circuit (1) is electrically connected with the driving circuit (2), the output circuit (3) and the power supply DC respectively, the driving circuit (2) is electrically connected with the output circuit (3) and the power supply DC respectively, the output circuit (3) is electrically connected with the power supply DC, the driving circuit (2) comprises a pull-up module (21), a current-limiting module (22) and a push-pull module (23), the pull-up module (21) is electrically connected with the control circuit (1) and the current-limiting module (22) respectively, and the pull-up module (21) is grounded, the current-limiting module (22) is electrically connected with the push-pull module (23), and the push-pull module (23) is electrically connected with the output circuit (3) and the power supply DC respectively; the output circuit (3) comprises an H-bridge circuit (31), the H-bridge circuit (31) comprises an upper bridge arm (311) composed of two PMOS tubes and a lower bridge arm (312) composed of two NMOS tubes, the upper bridge arm (311) is electrically connected with the lower bridge arm (312), the current-limiting module (22), the push-pull module (23) and the power supply DC respectively, and the lower bridge arm (312) is electrically connected with the push-pull module (23) and the control circuit (1) respectively. The pull-up module (21) comprises an NMOS tube Q3 and an NMOS tube Q4, the NMOS tube Q3 and the NMOS tube Q4 have a gate G, a source S and a drain D respectively, the gates G of the NMOS tube Q3 and the NMOS tube Q4 are electrically connected with the control circuit (1) respectively, the sources S of the NMOS tube Q3 and the NMOS tube Q4 are grounded, and the drains D of the NMOS tube Q3 and the NMOS tube Q4 are electrically connected with the current-limiting module (22) and the control circuit (1) respectively.
2. The MOSFET H-bridge drive circuit of claim 1, wherein, The current-limiting module (22) comprises a resistor R24, a resistor R25, a resistor R31 and a resistor R26, the resistor R24, the resistor R25, the resistor R31 and the resistor R26 have a No. 1 end and a No. 2 end respectively, the No. 1 end of the resistor R24 is electrically connected with the control circuit (1) and the pull-up module (21) respectively, the No. 2 end of the resistor R24 is electrically connected with the push-pull module (23) and the No. 1 end of the resistor R25 respectively, the No. 1 end and the No. 2 end of the resistor R25 are electrically connected with the push-pull module (23) respectively, the No. 1 end of the resistor R31 is electrically connected with the control circuit (1) and the pull-up module (21) respectively, the No. 2 end of the resistor R31 is electrically connected with the push-pull module (23) and the No. 1 end of the resistor R26 respectively, and the No. 1 end and the No. 2 end of the resistor R26 are electrically connected with the push-pull module (23) respectively.
3. The MOSFET H-bridge drive circuit of claim 1, wherein, 4. The MOSFET H-bridge drive circuit of claim 1, wherein, The push-pull module (23) comprises a triode Q5, a triode Q6, a triode Q11, a triode Q12, a resistor R32 and a resistor R33, the triode Q5, the triode Q6, the triode Q11 and the triode Q12 have a base B, a collector C and an emitter E respectively, the resistor R32 and the resistor R33 have a No. 1 terminal and a No. 2 terminal respectively, the base B of the triode Q5 is electrically connected with the current limiting module (22) and the base B of the triode Q6 respectively, the collector C of the triode Q5 is electrically connected with the current limiting module (22), the upper bridge arm (311) and the power supply DC respectively, the emitter E of the triode Q5 is electrically connected with the No. 1 terminal of the resistor R32 and the upper bridge arm (311) respectively; the base B of the triode Q6 is electrically connected with the current limiting module (22), the collector C of the triode Q6 is electrically connected with the lower bridge arm (312) and the control circuit (1) respectively, and the emitter E of the triode Q6 is electrically connected with the No. 2 terminal of the resistor R32; the base B of the triode Q11 is electrically connected with the current limiting module (22) and the base B of the triode Q12 respectively, the collector C of the triode Q11 is electrically connected with the current limiting module (22), the upper bridge arm (311) and the power supply DC respectively, the emitter E of the triode Q11 is electrically connected with the No. 1 terminal of the resistor R33 and the upper bridge arm (311) respectively; the base B of the triode Q12 is electrically connected with the current limiting module (22), the collector C of the triode Q12 is electrically connected with the lower bridge arm (312) and the control circuit (1) respectively, and the emitter E of the triode Q12 is electrically connected with the No. 2 terminal of the resistor R33.
5. The MOSFET H-bridge drive circuit of claim 1, wherein, The control circuit (1) comprises a control chip (11), a current limiting resistor (12), a filter capacitor (13) and a protection diode (14), the control chip (11) has 1-8 ports, the No. 1 port of the control chip (11) is electrically connected with the current limiting resistor (12), the filter capacitor (13) and the protection diode (14) respectively, the No. 2 port of the control chip (11) is electrically connected with the current limiting resistor (12), the filter capacitor (13) and the protection diode (14) respectively, the No. 3 port of the control chip (11) is electrically connected with the power supply DC and the filter capacitor (13) respectively, the No. 4 port of the control chip (11) is grounded, the No. 5 port of the control chip (11) is electrically connected with the current limiting resistor (12) and the filter capacitor (13) respectively, the No. 6 port of the control chip (11) is electrically connected with the current limiting resistor (12) and the filter capacitor (13) respectively, the No. 7 port of the control chip (11) is electrically connected with the pull-up module (21), and the No. 8 port of the control chip (11) is electrically connected with the pull-up module (21); the current limiting resistor (12) is electrically connected with the lower bridge arm (312) and the protection diode (14) respectively, and the current limiting resistor (12) is grounded; the filter capacitor (13) is electrically connected with the current limiting resistor (12), the protection diode (14) and the power supply DC respectively; and the protection diode (14) is electrically connected with the pull-up module (21).
6. The MOSFET H-bridge drive circuit of claim 5, wherein, The current limiting resistor (12) includes resistors R28, R29, R30, R34, R35, R37, R38, R39 and R40, the resistors R28, R29, R30, R34, R35, R37, R38, R39 and R40 have No.1 end and No.2 end respectively, the No.1 end of the resistor R28 is electrically connected with the control chip (11), the filter capacitor (13) and the protection diode (14) respectively, the No.2 end of the resistor R28 is electrically connected with the No.1 end of the resistor R29, the No.2 end of the resistor R34 and the No.1 end of the resistor R37 respectively; the No.1 end of the resistor R29 is electrically connected with the No.2 end of the resistor R34 and the No.1 end of the resistor R37 respectively, the No.2 end of the resistor R29 is grounded; the No.1 end of the resistor R30 is electrically connected with the control chip (11), the filter capacitor (13) and the protection diode (14) respectively, the No.2 end of the resistor R30 is electrically connected with the No.1 end of the resistor R35 and the No.1 end of the resistor R38 respectively; the No.1 end of the resistor R34 is electrically connected with the control chip (11) and the filter capacitor (13) respectively, the No.2 end of the resistor R34 is electrically connected with the No.1 end of the resistor R37; the No.2 end of the resistor R35 is electrically connected with the lower bridge arm (312); the No.2 end of the resistor R37 is electrically connected with the lower bridge arm (312); the No.1 end of the resistor R38 is electrically connected with the No.1 end of the resistor R35, the No.2 end of the resistor R38 is grounded; the resistor R39 is connected with the filter capacitor (13) in parallel, the No.1 end of the resistor R39 is grounded, the No.2 end of the resistor R39 is electrically connected with the No.1 end of the resistor R40; the No.2 end of the resistor R40 is electrically connected with the push-pull circuit (23) and the lower bridge arm (312) respectively.
7. The MOSFET H-bridge drive circuit of claim 5, wherein, The filter capacitor (13) comprises a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15 and a capacitor C17, the capacitor C12, the capacitor C13, the capacitor C14, the capacitor C15 and the capacitor C17 have a No. 1 end and a No. 2 end respectively, the No. 1 end of the capacitor C12 is electrically connected with the current-limiting resistor (12), the control chip (11) and the protection diode (14) respectively, the No. 2 end of the capacitor C12 is electrically connected with the No. 2 end of the capacitor C13, and the No. 2 end of the capacitor C12 is grounded; the No. 1 end of the capacitor C13 is electrically connected with the current-limiting resistor (12), the control chip (11) and the protection diode (14) respectively, the No. 2 end of the capacitor C13 is grounded; the No. 1 end of the capacitor C14 is electrically connected with the control chip (11) and the power supply DC respectively, the No. 2 end of the capacitor C14 is electrically connected with the No. 1 end of the capacitor C15 and the current-limiting resistor (12) respectively, and the No. 2 end of the capacitor C14 is grounded; the No. 1 end and the No. 2 end of the capacitor C15 are connected in parallel with the current-limiting resistor (12), the No. 1 end of the capacitor C15 is grounded, and the No. 2 end of the capacitor C15 is electrically connected with the control chip (11) and the current-limiting resistor (12) respectively; the No. 1 end of the capacitor C17 is electrically connected with the control chip (11) and the current-limiting resistor (12) respectively, and the No. 2 end of the capacitor C17 is grounded.
8. The MOSFET H-bridge drive circuit of claim 5, wherein, The protection diode (14) comprises a diode D10 and a diode D11, the diode D10 and the diode D11 have a No. 1 end and a No. 2 end, the No. 1 end of the diode D10 is electrically connected with the control chip (11), the current-limiting resistor (12) and the filter capacitor (13) respectively, the No. 2 end of the diode D10 is electrically connected with the pull-up module (21) and the current-limiting module (22) respectively; the No. 1 end of the diode D11 is electrically connected with the control chip (11), the current-limiting resistor (12) and the filter capacitor (13) respectively, and the No. 2 end of the diode D11 is electrically connected with the pull-up module (21) and the current-limiting module (22) respectively.
9. The MOSFET H-bridge drive circuit of claim 1, wherein, The output circuit (3) further comprises a capacitor C1, a capacitor C2 and a resistor R36, the capacitor C1 and the capacitor C2 have a No. 1 end and a No. 2 end respectively, the No. 1 end and the No. 2 end of the capacitor C1 and the capacitor C2 are connected in parallel respectively, the No. 1 end of the capacitor C1 and the capacitor C2 connected in parallel is electrically connected with the power supply DC and the upper bridge arm (311) respectively, and the No. 2 end of the capacitor C1 and the capacitor C2 connected in parallel is grounded; the resistor R36 has a No. 1 end and a No. 2 end, the No. 1 end of the resistor R36 is electrically connected with the lower bridge arm (312), and the No. 2 end of the resistor R36 is grounded.