Half-bridge driving circuit and electronic equipment
By introducing first-stage and second-stage drive circuits into the half-bridge circuit and setting up conduction and delay control modules, the short-circuit problem caused by the simultaneous conduction of the upper and lower MOSFETs in the half-bridge circuit is solved, achieving low-cost and efficient dead-time extension and enhanced drive capability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-27
AI Technical Summary
In the existing technology, when the upper and lower MOSFETs are turned on at the same time, the power supply is prone to short circuit to ground, which may burn out the components. Moreover, the existing solutions are costly or cause the MOSFETs to overheat.
A half-bridge drive circuit is adopted, including a first-stage drive circuit and a second-stage drive circuit. The first-stage drive circuit outputs a drive control signal after a delay after receiving a control signal. The second-stage drive circuit drives the half-bridge circuit according to the received signal. A conduction control module and a delay control module are set to accurately extend the dead time and reduce the turn-on loss.
While reducing circuit costs, it efficiently and accurately extends dead time, improves the operational safety and driving capability of half-bridge circuits, reduces turn-on losses, and achieves precise driving.
Smart Images
Figure CN224054111U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to half bridge drive technical field especially relates to a kind of half bridge drive circuit and electronic equipment. BACKGROUND
[0002] When half bridge circuit works, if the upper and lower MOS tubes of half bridge circuit are simultaneously turned on, it will cause the short circuit of power supply to ground, and in serious case, it may burn out components.Therefore, when designing circuit structure, sufficient dead time needs to be reserved to avoid the simultaneous conduction of upper and lower tubes.
[0003] At present, in the prior art, the extension of half bridge drive dead time is usually realized by IC (Integrated Circuit, chip) control or by increasing gate drive resistance.However, in the above prior art, the former has high cost, and the latter will increase the time required for MOS tube opening, which is easy to cause the MOS tube to heat seriously.
[0004] Therefore, it is particularly important to propose a technical scheme capable of reducing circuit cost while efficiently and accurately extending dead time and reducing the opening loss of half bridge circuit to realize accurate driving of half bridge circuit. UTILITY MODEL CONTENTS
[0005] The utility model provides a kind of half bridge drive circuit and electronic equipment, can reduce circuit cost while efficiently and accurately extend dead time and reduce the opening loss of half bridge circuit, it is conducive to realize accurate driving half bridge circuit.
[0006] To solve the above technical problems, the utility model discloses a kind of half bridge drive circuit, the half bridge drive circuit includes primary drive circuit and secondary drive circuit, wherein:
[0007] The first end of the primary drive circuit is used to receive the first control signal, the second end of the primary drive circuit is electrically connected with the first end of the secondary drive circuit, and the second end of the secondary drive circuit is used to electrically connect the first end of the half bridge circuit;
[0008] The third end of the primary drive circuit and the third end of the secondary drive circuit are respectively used to electrically connect the first power supply voltage;The fourth end of the primary drive circuit and the fourth end of the secondary drive circuit are respectively used for grounding;
[0009] The primary drive circuit is used to output drive control signal to the secondary drive circuit after receiving the first control signal and passing through the control duration corresponding to the first control signal;
[0010] The secondary drive circuit is configured to output a first drive signal to the half-bridge circuit according to the received drive control signal, so as to drive the half-bridge circuit.
[0011] As an optional implementation, in the first aspect of the utility model, the primary drive circuit comprises a first conduction control module and a dead time control module, wherein:
[0012] The first end of the first conduction control module is configured to receive the first control signal, the second end of the first conduction control module is electrically connected with the first end of the dead time control module, and the second end of the dead time control module is electrically connected with the first end of the secondary drive circuit.
[0013] The third end of the first conduction control module and the third end of the dead time control module are respectively configured to be electrically connected with the first power supply voltage, and the fourth end of the first conduction control module and the fourth end of the dead time control module are respectively configured to be grounded.
[0014] The first conduction control module is configured to turn on the first conduction control module when the first control signal is a first preset signal.
[0015] The dead time control module is configured to output a drive control signal of a first target level to the secondary drive circuit after a charging delay duration is passed when the first conduction control module is in a conduction state.
[0016] As an optional implementation, in the first aspect of the utility model, the first conduction control module comprises a first switch unit and a first protection unit, wherein:
[0017] The first end of the first switch unit is configured to receive the first control signal, the second end of the first switch unit is electrically connected with the first end of the first protection unit and the first end of the dead time control module respectively, the third end of the first switch unit is configured to be grounded, and the second end of the first protection unit is configured to be electrically connected with the first power supply voltage.
[0018] As an optional implementation, in the first aspect of the utility model, the dead time control module comprises a second switch unit, a second protection unit and a delay control unit, wherein:
[0019] The first end of the second switch unit is electrically connected with the second end of the first conduction control module, the second end of the second switch unit is electrically connected with the first end of the second protection unit and the first end of the delay control unit respectively, the second end of the second protection unit is used for electrically connecting the first power supply voltage, the second end of the delay control unit is electrically connected with the first end of the secondary drive circuit, and the third end of the second switch unit and the third end of the delay control unit are respectively used for grounding.
[0020] As an optional implementation, in the first aspect of the utility model, the delay control unit comprises a slow riser unit and a voltage stabilizer unit, wherein:
[0021] The first end of the slow riser unit and the first end of the voltage stabilizer unit are electrically connected with the second end of the second switch unit and the first end of the second protection unit, the second end of the slow riser unit is used for grounding, and the second end of the voltage stabilizer unit is electrically connected with the first end of the secondary drive circuit.
[0022] The slow riser unit is used for charging the slow riser unit when the first conduction control module is in the conduction state.
[0023] The voltage stabilizer unit is used for turning on the voltage stabilizer unit to output the first target level of drive control signal to the secondary drive circuit when the voltage of the slow riser unit is greater than or equal to the preset voltage corresponding to the voltage stabilizer unit, and the charging delay time length is the time length required for charging the voltage of the slow riser unit to the preset voltage.
[0024] As an optional implementation, in the first aspect of the utility model, the secondary drive circuit comprises a second conduction control module, a third conduction control module and a push-pull output module, wherein:
[0025] The first end of the second conduction control module is electrically connected with the second end of the primary drive circuit, the second end of the second conduction control module is electrically connected with the first end of the third conduction control module, the second end of the third conduction control module is electrically connected with the first end of the push-pull output module, and the second end of the push-pull output module is used for electrically connecting the first end of the half-bridge circuit.
[0026] The third end of the second conduction control module, the third end of the third conduction control module and the third end of the push-pull output module are respectively used for electrically connecting the first power supply voltage, and the fourth end of the second conduction control module, the fourth end of the third conduction control module and the fourth end of the push-pull output module are respectively used for grounding.
[0027] The second conduction control module is configured to turn on the second conduction control module when the drive control signal is a second preset signal.
[0028] The third conduction control module is configured to turn off the third conduction control module when the second conduction control module is in a turned-on state.
[0029] The push-pull output module is configured to output a first drive signal of a second target level to the half-bridge circuit to turn on a module in the half-bridge circuit electrically connected with the push-pull output module when the third conduction control module is in an off state.
[0030] As an optional implementation form, in the first aspect of the utility model, the second conduction control module includes a third switch unit and a third protection unit, wherein:
[0031] The first end of the third switch unit is electrically connected with the second end of the first-stage drive circuit, the second end of the third switch unit is respectively electrically connected with the first end of the third protection unit and the first end of the third conduction control module, the third end of the third switch unit is used for grounding, and the second end of the third protection unit is used for electrically connecting the first power supply voltage.
[0032] Furthermore, the third conduction control module includes a fourth switch unit and a fourth protection unit, wherein:
[0033] The first end of the fourth switch unit is electrically connected with the second end of the second conduction control module, the second end of the fourth switch unit is respectively electrically connected with the fourth protection unit and the first end of the push-pull output module, the third end of the fourth switch unit is used for grounding, and the second end of the fourth protection unit is used for electrically connecting the first power supply voltage.
[0034] As an optional implementation form, in the first aspect of the utility model, the push-pull output module includes a push-pull unit and an on-driving unit, wherein:
[0035] The first end of the push-pull unit is electrically connected with the second end of the third conduction control module, the second end of the push-pull unit is electrically connected with the first end of the on-driving unit, the third end of the push-pull unit is used for grounding, the fourth end of the push-pull unit is used for electrically connecting the first power supply voltage, and the second end of the on-driving unit is used for electrically connecting the first end of the half-bridge circuit.
[0036] As an optional implementation form, in the first aspect of the utility model, the circuit further includes the half-bridge circuit, and the half-bridge circuit includes a first half-bridge switch module and a second half-bridge switch module, wherein:
[0037] The first end of the first half-bridge switch module is electrically connected with the second end of the secondary driving circuit, and the second end of the first half-bridge switch module is used for grounding; the first end of the second half-bridge switch module is used for receiving a second driving signal, the second end of the second half-bridge switch module is used for electrically connecting a second power supply voltage, and the third end of the first half-bridge switch module is electrically connected with the third end of the second half-bridge switch module and used for electrically connecting a load; wherein the second driving signal is opposite to the first driving signal.
[0038] The half-bridge circuit is used for outputting a load control signal to the load according to the received first driving signal and second driving signal.
[0039] The utility model discloses a second aspect discloses an electronic equipment, the electronic equipment includes equipment body and like the half bridge drive circuit of any one disclosed in the first aspect.
[0040] Compared with the prior art, the utility model has the following beneficial effects:
[0041] In the utility model, a kind of half bridge drive circuit is provided, which includes primary driving circuit and secondary driving circuit, wherein: the first end of primary driving circuit is used for receiving first control signal, the second end of primary driving circuit is electrically connected with the first end of secondary driving circuit, and the second end of secondary driving circuit is used for electrically connecting the first end of half bridge circuit;The third end of primary driving circuit and the third end of secondary driving circuit are respectively used for electrically connecting first power supply voltage;The fourth end of primary driving circuit and the fourth end of secondary driving circuit are respectively used for grounding;Primary driving circuit is used for outputting driving control signal to secondary driving circuit after receiving first control signal and after the control duration corresponding to first control signal;Secondary driving circuit is used for outputting first driving signal to half bridge circuit according to received driving control signal, to drive half bridge circuit.Visibly, after receiving first control signal and after the corresponding control duration, the utility model can output driving control signal to secondary driving circuit by primary driving circuit;Then, according to driving control signal, secondary driving circuit outputs first driving signal to half bridge circuit to drive half bridge circuit, which can reduce circuit cost, efficiently and accurately prolong dead time by setting primary driving circuit, enhance the driving ability of driving circuit by setting secondary driving circuit, reduce the turn-on loss of half bridge circuit, thereby improve the operation safety of half bridge circuit, and then facilitate accurate and stable driving of half bridge circuit. BRIEF DESCRIPTION OF DRAWINGS
[0042] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.
[0043] Figure 1 is a structural schematic diagram of a half-bridge drive circuit disclosed by the embodiments of the present application;
[0044] Figure 2 is a structural schematic diagram of another half-bridge drive circuit disclosed by the embodiments of the present application;
[0045] Figure 3 is a structural schematic diagram of still another half-bridge drive circuit disclosed by the embodiments of the present application;
[0046] Figure 4 is a structural schematic diagram of still another half-bridge drive circuit disclosed by the embodiments of the present application;
[0047] Figure 5 is a principle schematic diagram of a half-bridge drive circuit disclosed by the embodiments of the present application;
[0048] Figure 6 is a structural schematic diagram of an electronic device disclosed by the embodiments of the present application. DETAILED DESCRIPTION
[0049] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the embodiments in the present application.
[0050] It should be noted that, unless otherwise explicitly specified and limited, the term "electrically connected" in the description and claims of the present application and the above-mentioned drawings should be understood broadly, for example, it can be fixed electrically connected, or it can be detachable electrically connected, or it can be integrally electrically connected; it can be mechanical electrically connected, or it can be electrically connected or it can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. In addition, the terms "first", "second" and the like in the description and claims of the present application and the above-mentioned drawings are used to distinguish different objects, and are not used to describe a specific order, the terms "include" and "have" and any variants thereof are intended to cover non-exclusive inclusion. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.
[0051] Embodiment one
[0052] Please refer to Figure 1 , Figure 1 is a structure diagram of a half-bridge drive circuit disclosed by the embodiment of the present application. Wherein, the circuit can be applied to electronic products that need to drive half-bridge circuit, the embodiment of the present application does not make limitation. As shown in Figure 1 , the half-bridge drive circuit can include a first drive circuit 10 and a second drive circuit 20, wherein:
[0053] The first end of the first drive circuit 10 is used for receiving a first control signal, the second end of the first drive circuit 10 is electrically connected with the first end of the second drive circuit 20, and the second end of the second drive circuit 20 is used for electrically connecting the first end of the half-bridge circuit 30;
[0054] The third end of the first drive circuit 10 and the third end of the second drive circuit 20 are respectively used for electrically connecting a first power supply voltage; the fourth end of the first drive circuit 10 and the fourth end of the second drive circuit 20 are respectively used for grounding;
[0055] The first drive circuit 10 is used for outputting a drive control signal to the second drive circuit 20 after receiving the first control signal and after the control duration corresponding to the first control signal;
[0056] The second drive circuit 20 is used for outputting a first drive signal to the half-bridge circuit 30 according to the received drive control signal, so as to drive the half-bridge circuit 30.
[0057] The first driving circuit 10 controls the time length of the delay from receiving the first control signal to outputting the driving control signal to the second driving circuit 20, that is, the control time length corresponding to the first control signal, so that the half-bridge circuit 30 is driven with delay. The second driving circuit enhances the driving capability of the half-bridge circuit 30, so as to shorten the conduction time required by the half-bridge circuit 30.
[0058] It can be seen that the circuit provided by the embodiment of the utility model has simple structure and is easy to implement. After receiving the first control signal and after the corresponding control time length, the first driving circuit outputs the driving control signal to the second driving circuit. Then, the second driving circuit outputs the first driving signal to the half-bridge circuit according to the driving control signal, so as to drive the half-bridge circuit. The circuit cost is reduced, the dead time is efficiently and accurately prolonged by the first driving circuit, the driving capability of the driving circuit is enhanced by the second driving circuit, the turn-on loss of the half-bridge circuit is reduced, the operation safety of the half-bridge circuit is improved, and the half-bridge circuit is accurately and stably driven.
[0059] In an optional embodiment, refer to Figure 2 , Figure 2 is another structural schematic diagram of the half-bridge driving circuit disclosed by the embodiment of the utility model. As shown in Figure 2 , the first driving circuit 10 can include a first conduction control module 101 and a dead time control module 102, wherein:
[0060] The first end of the first conduction control module 101 is used for receiving the first control signal. The second end of the first conduction control module 101 is electrically connected with the first end of the dead time control module 102. The second end of the dead time control module 102 is electrically connected with the first end of the second driving circuit 20.
[0061] The third end of the first conduction control module 101 and the third end of the dead time control module 102 are respectively used for electrically connecting the first power supply voltage. The fourth end of the first conduction control module 101 and the fourth end of the dead time control module 102 are respectively used for grounding.
[0062] The first conduction control module 101 is used for turning on the first conduction control module 101 when the first control signal is the first preset signal.
[0063] The dead time control module 102 is used for outputting the driving control signal with the first target level to the second driving circuit 20 after the charging delay time length when the first conduction control module 101 is in the conduction state.
[0064] When the first control signal is a first preset signal, the charging delay time length can be a dead time control time length corresponding to the half-bridge driving circuit.
[0065] Optionally, the first conduction control module 101 is further configured to cut off the first conduction control module 101 when the first control signal is not the first preset signal, and the dead time control module 102 is further configured to output a first level driving control signal to the secondary driving circuit 20 when the first conduction control module 101 is in the cut-off state, and the embodiment is not limited in this regard. Further optionally, the first control signal that is not the first preset signal can be a low-level signal, and the embodiment is not limited in this regard. Further optionally, the first level driving control signal can be a low-level driving control signal, and the embodiment is not limited in this regard.
[0066] It can be seen that, in the optional embodiment, by arranging the first conduction control module and the dead time control module in the primary driving circuit, the first conduction control module can only be turned on when the preset first control signal is received, thereby improving the conduction control efficiency and accuracy of the first conduction control module. In addition, the driving control signal can only be output with a delay when the first conduction control module is turned on, thereby prolonging the dead time, improving the prolongation control accuracy and efficiency of the dead time, and improving the control accuracy of the driving control signal output to the secondary driving circuit, thereby facilitating the improvement of the driving control accuracy of the half-bridge circuit.
[0067] In the optional embodiment, as shown in Figure 2 , the first conduction control module 101 can include a first switching unit 1011 and a first protection unit 1012, wherein:
[0068] The first end of the first switching unit 1011 is configured to receive the first control signal, the second end of the first switching unit 1011 is electrically connected to the first end of the first protection unit 1012 and the first end of the dead time control module 102 respectively, and the third end of the first switching unit 1011 is configured to be grounded; the second end of the first protection unit 1012 is configured to be electrically connected to the first power supply voltage.
[0069] Optionally, as shown in Figure 4 , Figure 4 is a structure diagram of another half-bridge driving circuit according to an embodiment of the utility model, wherein, as shown in Figure 4 , the first switching unit 1011 can include a first switching device Q1, and the first protection unit 1012 can include a first resistor R1, wherein:
[0070] The first end of the first switch device Q1 is configured to receive a first control signal, the second end of the first switch device Q1 is electrically connected with the first end of the first resistor R1 and the first end of the dead time control module 102 respectively, and the third end of the first switch device Q1 is configured to be grounded; and the second end of the first resistor R1 is configured to be electrically connected with the first power supply voltage.
[0071] For example, the first power supply voltage can be VCC as shown in the formula (1), and the embodiment is not limited thereto. Figure 4
[0072] Further, the first switch device Q1 can be any device or component capable of playing the same switching control role, such as a triode; when the first switch device Q1 is an NPN triode, the first end of the first switch device Q1 is the base, the second end of the first switch device Q1 is the collector, and the third end of the first switch device Q1 is the emitter; this can facilitate the selection of a suitable switch device according to the actual situation of the component, thereby improving the applicability of the circuit.
[0073] It can be seen that, by arranging the first switch unit in the first conduction control module, the conduction control efficiency and stability of the first conduction control module can be improved, thereby facilitating the improvement of the control efficiency and stability of the dead time control module, and further facilitating the improvement of the control accuracy of the dead time; and by arranging the first protection unit in the first conduction control module, the stability of the circuit can be improved in the case that the conduction / cutoff of the circuit changes and causes the voltage to change.
[0074] In this alternative embodiment, as shown in the formula (2), the dead time control module 102 can include a second switch unit 1021, a second protection unit 1022, and a delay control unit 1023, wherein: Figure 2
[0075] The first end of the second switch unit 1021 is electrically connected with the second end of the first conduction control module 101, the second end of the second switch unit 1021 is electrically connected with the first end of the second protection unit 1022 and the first end of the delay control unit 1023 respectively; the second end of the second protection unit 1022 is configured to be electrically connected with the first power supply voltage; the second end of the delay control unit 1023 is electrically connected with the first end of the secondary drive circuit 20, and the third end of the second switch unit 1021 and the third end of the delay control unit 1023 are configured to be grounded.
[0076] When the first conduction control module 101 is in the conduction state, the second switch unit 1021 is in the cutoff state; when the first conduction control module 101 is in the cutoff state, the second switch unit 1021 is in the conduction state.
[0077] Optionally, as shown in the formula (3), the second switch unit 1021 can include a second switch device Q2, a second resistor R2, and a second diode D2, wherein: Figure 4 As shown in the figure, the second switch unit 1021 can include a second switch device Q2, and the second protection unit 1022 can include a second resistor R2, wherein:
[0078] The first end of the second switch device Q2 is electrically connected with the second end of the first conduction control module 101, the second end of the second switch device Q2 is electrically connected with the first end of the second resistor R2 and the first end of the delay control unit 1023 respectively; the second end of the second resistor R2 is used for electrically connecting the first power supply voltage; the third end of the second switch device Q2 is used for grounding respectively.
[0079] Further optionally, the second switch device Q2 can be any device or component capable of playing the same switching control role as a triode, etc.; wherein, when the second switch device Q2 is an NPN type triode, the first end of the second switch device Q2 is the base, the second end of the second switch device Q2 is the collector, and the third end of the second switch device Q2 is the emitter; in this way, it is beneficial to select a suitable switch device according to the actual situation of the component, thereby improving the applicability of the circuit.
[0080] As can be seen, by setting the second switch unit in the dead time control module, the off / on of the second switch unit can be controlled by using the voltage change in the circuit when the first conduction control module is in different on / off states, which can improve the on control efficiency and stability of the second switch unit, and is beneficial to improve the control accuracy of the second protection unit and the delay control unit, thereby being beneficial to improve the control accuracy of the dead time; and by setting the second protection unit in the dead time control module, the stability of the circuit can be improved in the case of voltage change caused by the on / off change of the circuit, and by setting the delay control unit in the dead time control module, the time length of the charging delay, i.e. the dead time, can be set flexibly by setting the second protection unit with different resistance values; and by setting the delay control unit in the dead time control module, the time length required for outputting the drive control signal to the secondary drive circuit and the output drive control signal can be flexibly adjusted under different first control signals by using the voltage change of the first conduction control module and the second switch unit in different on / off states, thereby being able to reduce the cost of the circuit while improving the output control flexibility and efficiency of the drive control signal.
[0081] In this optional embodiment, as shown in the figure, Figure 2 As shown in the figure, the delay control unit 1023 can include a buffer subunit 10231 and a voltage stabilizing subunit 10232, wherein:
[0082] The first end of the slow riser unit 10231 and the first end of the voltage stabilizer unit 10232 are electrically connected with the second end of the second switch unit 1021 and the first end of the second protection unit 1022, the second end of the slow riser unit 10231 is used for grounding, and the second end of the voltage stabilizer unit 10232 is electrically connected with the first end of the secondary drive circuit 20.
[0083] The slow riser unit 10231 is used for charging the slow riser unit 10231 when the first conduction control module 101 is in the conduction state.
[0084] The voltage stabilizer unit 10232 is used for turning on the voltage stabilizer unit 10232 to output the first target level of the drive control signal to the secondary drive circuit 20 when the voltage of the slow riser unit 10231 is greater than or equal to the preset voltage corresponding to the voltage stabilizer unit 10232, and the charging delay time length is the time length required for charging the voltage of the slow riser unit 10231 to the preset voltage.
[0085] Optionally, as shown in Figure 4 The slow riser unit 10231 can include a slow riser capacitor C1, and the voltage stabilizer unit 10232 can include a voltage stabilizer diode D1, wherein:
[0086] The first end of the slow riser capacitor C1 and the cathode of the voltage stabilizer diode D1 are electrically connected with the second end of the second switch unit 1021 and the first end of the second protection unit 1022, the second end of the slow riser capacitor C1 is used for grounding, and the anode of the voltage stabilizer diode D1 is electrically connected with the first end of the secondary drive circuit 20.
[0087] Optionally, the preset voltage can be the voltage stabilizing value of the voltage stabilizer diode D1, and the embodiment is not limited.
[0088] Please refer to Figure 5 , Figure 5 It is a principle schematic view of a half-bridge drive circuit disclosed by the embodiment of the utility model; it should be explained that when the first conduction control module 101 is in the conduction state, as shown in Figure 5 , Figure 5The voltage at point B (i.e., the first terminal of the soft-start capacitor C1 and the cathode of the Zener diode D1) is pulled high, but since the voltage across the capacitor cannot change abruptly, the voltage at point B rises slowly. When the voltage at point B rises to the regulated value, the Zener diode D1 turns on. Therefore, the time it takes for the voltage at point B to rise from 0V to the regulated value is the charging delay time. Furthermore, when the second protection unit 1022 includes a second resistor R2, the charging delay time is determined by the resistance value of the second resistor R2 and the capacitance value of the soft-start capacitor C1. The larger the resistance value of the second resistor R2 and the capacitance value of the soft-start capacitor C1, the longer the charging delay time. Also, when the transistor Q1 (i.e., the first switching device Q1) is in the off state, point A is pulled up to a high level, the transistor Q2 (i.e., the second switching device Q2) turns on, the soft-start capacitor C1 discharges quickly to GND through the transistor Q2, the voltage at point B is pulled down quickly, thereby quickly turning off the Zener diode D1.
[0089] As can be seen, by setting a soft-start subunit and a voltage regulator subunit in the delay control unit, when the first conduction control module is in the conduction state, the charging time of the soft-start subunit is controlled, thereby controlling the duration of the delayed conduction of the voltage regulator subunit, delaying the output of the drive control signal, and thus delaying the drive of the half-bridge circuit, achieving the effect of extending the dead time of the half-bridge circuit. This can reduce circuit costs while improving the flexibility and efficiency of dead time extension control. Furthermore, when the first conduction control module is in the off state, the soft-start subunit can be rapidly discharged to quickly turn off the voltage regulator subunit, thereby quickly outputting an inverted drive control signal, and thus turning off the corresponding MOSFET of the half-bridge circuit in a short time, so as to achieve precise drive control of the half-bridge circuit.
[0090] In another alternative embodiment, such as Figure 2 As shown, the secondary drive circuit 20 may include a second conduction control module 201, a third conduction control module 202, and a push-pull output module 203, wherein:
[0091] The first end of the second conduction control module 201 is electrically connected to the second end of the first-stage drive circuit 10. The second end of the second conduction control module 201 is electrically connected to the first end of the third conduction control module 202. The second end of the third conduction control module 202 is electrically connected to the first end of the push-pull output module 203. The second end of the push-pull output module 203 is used to electrically connect to the first end of the half-bridge circuit 30.
[0092] The third terminal of the second conduction control module 201, the third terminal of the third conduction control module 202, and the third terminal of the push-pull output module 203 are respectively used to electrically connect to the first power supply voltage; the fourth terminal of the second conduction control module 201, the fourth terminal of the third conduction control module 202, and the fourth terminal of the push-pull output module 203 are respectively used to ground.
[0093] The second conduction control module 201 is configured to turn on the second conduction control module 201 when the driving control signal is the second preset signal.
[0094] The third conduction control module 202 is configured to turn off the third conduction control module 202 when the second conduction control module 201 is in the on state.
[0095] The push-pull output module 203 is configured to output the first driving signal of the second target level to the half-bridge circuit 30 to drive the module in the half-bridge circuit 30 electrically connected with the push-pull output module 203 to open when the third conduction control module 202 is in the off state.
[0096] Optionally, the second preset signal can be a high-level signal, which is not limited in the embodiment; and optionally, the first driving signal of the second target level can be a high-level first driving signal, which is not limited in the embodiment.
[0097] Optionally, the second conduction control module 201 is further configured to turn off the second conduction control module 201 when the driving control signal is not the second preset signal; and the third conduction control module 202 is further configured to turn on the third conduction control module 202 when the second conduction control module 201 is in the off state; and the push-pull output module 203 is configured to output the first driving signal of the second level to the half-bridge circuit 30 to drive the module in the half-bridge circuit 30 electrically connected with the push-pull output module 203 to close when the third conduction control module 202 is in the on state, which is not limited in the embodiment. Further optionally, the first driving signal of the second level can be a low-level driving control signal, which is not limited in the embodiment.
[0098] It can be seen that in the optional embodiment, the second conduction control module and the third conduction control module are arranged in the two-stage driving circuit, and only when the preset driving control signal is received, the second conduction control module can be turned on, and when the second conduction control module is turned on, the third conduction control module is turned off, thereby improving the conduction control efficiency and the conduction control accuracy of the second conduction control module and the third conduction control module; and the push-pull output module is arranged in the two-stage driving circuit, and the voltage change of the third conduction control module in the off state is used to drive the push-pull output module to output the first driving signal, thereby improving the output control accuracy of the first driving signal, enhancing the driving capability of the first driving signal, reducing the opening loss of the half-bridge circuit, improving the operation safety of the half-bridge circuit, and thus facilitating the precise and stable driving of the half-bridge circuit.
[0099] In the optional embodiment, as shown in Figure 2 the second conduction control module 201 can include a third switching unit 2011 and a third protection unit 2012, wherein:
[0100] The first end of the third switch unit 2011 is electrically connected with the second end of the first drive circuit 10, the second end of the third switch unit 2011 is respectively electrically connected with the first end of the third protection unit 2012 and the first end of the third conduction control module 202, the third end of the third switch unit 2011 is used for grounding, and the second end of the third protection unit 2012 is used for electrically connecting the first power supply voltage.
[0101] Optionally, as shown in Figure 4 the third switch unit 2011 can include a third switch device Q3, and the third protection unit 2012 can include a third resistor R3, wherein:
[0102] The first end of the third switch device Q3 is electrically connected with the second end of the first drive circuit 10, the second end of the third switch device Q3 is respectively electrically connected with the first end of the third resistor R3 and the first end of the third conduction control module 202, the third end of the third switch device Q3 is used for grounding, and the second end of the third resistor R3 is used for electrically connecting the first power supply voltage.
[0103] It can be seen that, by arranging the third switch unit in the second conduction control module, the conduction control efficiency and the conduction control stability of the second conduction control module can be improved, so as to be conducive to improving the control accuracy of the conduction / cutoff of the third conduction control module; and by arranging the third protection unit in the second conduction control module, the stability of the circuit can be improved in the case that the voltage changes due to the change of the conduction / cutoff of the circuit.
[0104] In this alternative embodiment, optionally, as shown in Figure 2 the third conduction control module 202 can include a fourth switch unit 2021 and a fourth protection unit 2022, wherein:
[0105] The first end of the fourth switch unit 2021 is electrically connected with the second end of the second conduction control module 201, the second end of the fourth switch unit 2021 is respectively electrically connected with the fourth protection unit 2022 and the first end of the push-pull output module 203, the third end of the fourth switch unit 2021 is used for grounding, and the second end of the fourth protection unit 2022 is used for electrically connecting the first power supply voltage.
[0106] Optionally, as shown in Figure 4 the fourth switch unit 2021 can include a fourth switch device Q4, and the fourth protection unit 2022 can include a fourth resistor R4, wherein:
[0107] The first end of the fourth switch device Q4 is electrically connected with the second end of the second conduction control module 201, the second end of the fourth switch device Q4 is electrically connected with the fourth resistor R4 and the first end of the push-pull output module 203 respectively, the third end of the fourth switch device Q4 is used for grounding, and the second end of the fourth resistor R4 is used for electrically connecting the first power supply voltage.
[0108] Further, the switch device (for example, the third switch device Q3 and the fourth switch device Q4) in the embodiment can be any device or component capable of playing the same switching control role, such as a triode; when the switch device (for example, the third switch device Q3 and the fourth switch device Q4) is an NPN triode, the first end of the switch device is the base, the second end of the switch device is the collector, and the third end of the switch device is the emitter; in this way, the appropriate switch device can be selected according to the actual situation of the component, thereby improving the applicability of the circuit.
[0109] It can be seen that, by arranging the fourth switch unit in the third conduction control module, the conduction control efficiency and the conduction control stability of the third conduction control module can be improved, thereby improving the output control accuracy of the first drive signal, and further improving the driving accuracy of the half-bridge circuit; and by arranging the third protection unit in the second conduction control module, the stability of the circuit can be improved in the case that the voltage changes due to the change of the conduction / cutoff state of the circuit.
[0110] In the optional embodiment, as shown in Figure 2 the push-pull output module 203 can include a push-pull unit 2031 and an on driving unit 2032, wherein:
[0111] The first end of the push-pull unit 2031 is electrically connected with the second end of the third conduction control module 202, the second end of the push-pull unit 2031 is electrically connected with the first end of the on driving unit 2032, the third end of the push-pull unit 2031 is used for grounding, the fourth end of the push-pull unit 2031 is used for electrically connecting the first power supply voltage, and the second end of the on driving unit 2032 is used for electrically connecting the first end of the half-bridge circuit 30.
[0112] Optionally, as shown in Figure 4 the push-pull unit 2031 can include a fifth switch device Q5 and a sixth switch device Q6, and the on driving unit 2032 can include a fifth resistor R5, wherein:
[0113] The first end of the fifth switch device Q5 and the first end of the sixth switch device Q6 are electrically connected with the second end of the third conduction control module 202 respectively, the second end of the fifth switch device Q5 and the second end of the sixth switch device Q6 are electrically connected with the first end of the fifth resistor R5 respectively, the third end of the fifth switch device Q5 is used for grounding, the third end of the sixth switch device Q6 is used for electrically connecting the first power supply voltage, and the second end of the fifth resistor R5 is used for electrically connecting the first end of the half-bridge circuit 30.
[0114] Further, the switch device (such as the fifth switch device Q5 and the sixth switch device Q6) in the embodiment can be any device or component capable of playing the same switching control role, such as a triode. Figure 4 As shown in the figure, the fifth switch device Q5 can be a PNP triode, and the sixth switch device Q6 can be an NPN triode, which is not limited in the embodiment.
[0115] It can be seen that by arranging the push-pull unit and the on-driving unit in the push-pull output module, the driving capability of the first driving signal output by the half-bridge driving circuit can be enhanced, thereby improving the stability of the driving half-bridge circuit and reducing the on-loss of the half-bridge circuit, which is conducive to realizing accurate, stable and efficient driving of the half-bridge circuit while maintaining the operation safety of the half-bridge circuit.
[0116] In another optional embodiment, please refer to Figure 3 , Figure 3 is another structure diagram of a half-bridge driving circuit disclosed by the embodiment of the utility model, as shown in the figure, Figure 3 The half-bridge driving circuit can further include a half-bridge circuit 30, and the half-bridge circuit 30 can include a first half-bridge switch module 301 and a second half-bridge switch module 302, wherein:
[0117] The first end of the first half-bridge switch module 301 is electrically connected with the second end of the secondary driving circuit 20, and the second end of the first half-bridge switch module 301 is used for grounding; the first end of the second half-bridge switch module 302 is used for receiving a second driving signal, the second end of the second half-bridge switch module 302 is used for electrically connecting a second power supply voltage, and the third end of the first half-bridge switch module 301 and the third end of the second half-bridge switch module 302 are used for electrically connecting a load; wherein the second driving signal is opposite to the first driving signal;
[0118] The half-bridge circuit 30 is configured to output a load control signal to a load according to the received first driving signal and second driving signal.
[0119] In the embodiment, the first half-bridge switch module 301 and the second half-bridge switch module 302 cannot be turned on at the same time because the second driving signal is opposite to the first driving signal. Optionally, when the second half-bridge switch module 302 is turned on, the half-bridge circuit 30 can output the second supply voltage as the load control signal to the load. When the first half-bridge switch module 301 is turned on, the load control signal required to be output by the half-bridge circuit 30 to the load is pulled down to GND (Ground), which is not limited in the embodiment.
[0120] Optionally, as shown in Figure 4 , the second supply voltage can be Vbus, which is not limited in the embodiment.
[0121] Optionally, as shown in Figure 4 , the first half-bridge switch module 301 can include a seventh switch device Q7, and the second half-bridge switch module 302 can include an eighth switch device Q8, wherein:
[0122] The first end of the seventh switch device Q7 is electrically connected to the second end of the secondary driving circuit 20, and the second end of the seventh switch device Q7 is used for grounding. The first end of the eighth switch device Q8 is used for receiving the second driving signal, and the second end of the eighth switch device Q8 is used for electrically connecting the second supply voltage. The third end of the seventh switch device Q7 and the third end of the eighth switch device Q8 are used for electrically connecting the load.
[0123] Further optionally, the switch devices (such as the seventh switch device Q7 and the eighth switch device Q8) in the embodiment can be any device or component capable of playing the same switching control role as MOS tubes, etc. When the seventh switch device Q7 is a MOS tube, the first end of the seventh switch device Q7 is a gate (G), the second end of the seventh switch device Q7 is a source (S), and the third end of the seventh switch device Q7 is a drain (D). When the eighth switch device Q8 is a MOS tube, the first end of the eighth switch device Q8 is a gate (G), the second end of the eighth switch device Q8 is a drain (D), and the third end of the eighth switch device Q8 is a source (S). For example, as shown in Figure 4 , the seventh switch device Q7 and the eighth switch device Q8 can be N-type MOS tubes, which are not limited in the embodiment. In this way, it is beneficial to select appropriate switch devices according to the actual situation of components and devices, thereby improving the applicability of the circuit.
[0124] Optionally, the second driving signal received by the half-bridge circuit 30 can be generated by another circuit comprising the primary driving circuit 10 and the secondary driving circuit 20, and the embodiment is not limited in this regard; further optionally, the another circuit comprising the primary driving circuit 10 and the secondary driving circuit 20 can receive a second control signal, and further optionally, the second control signal can be opposite to the first control signal, and the embodiment is not limited in this regard.
[0125] It can be seen that the optional embodiment can output the first driving signal to the half-bridge circuit and output the second driving signal opposite to the first driving signal to the half-bridge circuit through the two-stage driving circuit, accurately drive the turn-on / off of the two half-bridge switch modules of the half-bridge circuit, and effectively avoid the simultaneous turn-on of the two switch modules of the half-bridge circuit, thereby improving the control accuracy of the half-bridge circuit in outputting the load control signal to the load.
[0126] Please refer to Figure 5 , Figure 5 is a schematic diagram of the working principle of the half-bridge driving circuit according to an embodiment of the present application, as shown in Figure 5 , the working principle of the half-bridge driving circuit according to an embodiment of the present application is as follows:
[0127] The half-bridge driving circuit comprises a two-stage driving circuit, as shown in Figure 5 , the half-bridge driving circuit comprises a primary driving circuit (i.e. the above-mentioned primary driving circuit) and a secondary driving circuit (i.e. the above-mentioned secondary driving circuit).
[0128] When the control signal (i.e. the above-mentioned first control signal) is high, the transistor Q1 in the primary driving circuit is turned on, the point A is pulled to low, causing the transistor Q2 to be cut off, so the voltage at the point B is pulled high, but because the voltage across the start-up capacitor C1 cannot change abruptly, the voltage at the point B rises slowly, and the time taken for the voltage at the point B to rise from 0V to aV is the delay time (i.e. the above-mentioned charging delay time), which is determined by the resistance value of R2 and the capacitance value of the start-up capacitor C1, and the greater the values of R2 and C1, the longer the delay time; when the voltage at the point B rises to aV (the voltage value of the stabilizing diode D1), the stabilizing diode D1 is turned on (i.e. outputs a high driving control signal to the transistor Q3), which causes the transistor Q3 in the secondary driving circuit to be turned on, the voltage at the point C is pulled low, causing the transistor Q4 to be cut off, the point D is pulled high, and the push-pull output at the point E is high (i.e. outputs a high first driving signal to the half-bridge circuit), at which time the MOS transistor Q7 starts to be turned on. Because the push-pull circuit in the secondary driving circuit has strong driving capability, the time required for the MOS transistor Q7 to be turned on can be reduced, thereby reducing the turn-on loss of the MOS transistor; therefore, by combining the two-stage driving circuit, the delay time can be effectively increased while the turn-on loss of the MOS transistor in the half-bridge circuit is reduced.
[0129] When the control signal is low, the transistor Q1 is not turned on, the point A is pulled up to high level, the transistor Q2 is turned on, the buffer capacitor C1 is quickly discharged to GND through the transistor Q2, the voltage of the point B is quickly pulled down, the D1 cannot be turned on (that is, a low level driving control signal is output to the transistor Q3), the Q3 is quickly turned off, at this time, the voltage of the point C is pulled up, the transistor Q4 is turned on, the voltage of the point D is pulled down, the push-pull output point E is low (that is, a low level first driving signal is output to the half-bridge circuit), at this time, the MOS transistor Q7 starts to be turned off. Since the capacitor C1 is directly discharged to GND, the discharge speed of C1 is very fast, so the time of turning off the MOS transistor Q7 is very short.
[0130] Similarly, the MOS transistor Q8 can be controlled to be turned on / off by receiving a second driving signal (that is, driving 2 in Figure 5 , and the second driving signal is opposite to the first driving signal; further, the second driving signal can also be output by a driving circuit similar to the two-stage driving circuit shown in Figure 5 , and the embodiment is not limited.
[0131] Therefore, the half-bridge driving circuit provided by the embodiment can realize delayed turn-on and quick turn-off of the MOS transistor in the half-bridge circuit, and can effectively prolong the dead time while reducing the turn-on loss of the MOS transistor.
[0132] Embodiment two
[0133] Please refer to Figure 6 , Figure 6 is a structural schematic diagram of an electronic device, and the electronic device includes the half-bridge driving circuit according to any one of the embodiments one. The functions that can be realized by the electronic device include but are not limited to the following: the dead time can be efficiently and accurately prolonged and the turn-on loss of the half-bridge circuit can be reduced while the circuit cost is reduced, so as to accurately drive the half-bridge circuit. It should be noted that the detailed description of the half-bridge driving circuit is described in the specific description of the related content in the embodiment one, and the embodiment is not described again.
[0134] It can be seen that the electronic device described in the embodiment Figure 6 can output a driving control signal to the two-stage driving circuit through the one-stage driving circuit after receiving the first control signal and after the corresponding control duration; and the two-stage driving circuit can output a first driving signal to the half-bridge circuit according to the driving control signal, so as to drive the half-bridge circuit. The circuit cost can be reduced, the dead time can be efficiently and accurately prolonged by setting the one-stage driving circuit, the driving ability of the driving circuit can be enhanced by setting the two-stage driving circuit, the turn-on loss of the half-bridge circuit can be reduced, the operation safety of the half-bridge circuit can be improved, and the half-bridge circuit can be accurately and stably driven.
[0135] Finally, it should be noted that: the utility model discloses a kind of half-bridge drive circuit and electronic equipment disclosed in the embodiment of the utility model is only the preferred embodiment of the utility model, only for the technical scheme of the utility model is described, not limit it;Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand;It can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features;And these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the embodiments of the utility model.
Claims
1. A half bridge drive circuit, characterized by The half-bridge drive circuit comprises a primary drive circuit (10) and a secondary drive circuit (20), wherein: The first end of the primary drive circuit (10) is used for receiving a first control signal, the second end of the primary drive circuit (10) is electrically connected with the first end of the secondary drive circuit (20), and the second end of the secondary drive circuit (20) is used for electrically connecting the first end of a half-bridge circuit (30); The third end of the primary drive circuit (10) and the third end of the secondary drive circuit (20) are respectively used for electrically connecting a first power supply voltage; the fourth end of the primary drive circuit (10) and the fourth end of the secondary drive circuit (20) are respectively used for grounding; The primary drive circuit (10) is used for outputting a drive control signal to the secondary drive circuit (20) after receiving the first control signal and after a control duration corresponding to the first control signal. The secondary drive circuit (20) is used for outputting a first drive signal to the half-bridge circuit (30) according to the received drive control signal, so as to drive the half-bridge circuit (30).
2. The half bridge drive circuit of claim 1, wherein, The primary drive circuit (10) comprises a first conduction control module (101) and a dead time control module (102), wherein: The first end of the first conduction control module (101) is used for receiving the first control signal, the second end of the first conduction control module (101) is electrically connected with the first end of the dead time control module (102), and the second end of the dead time control module (102) is electrically connected with the first end of the secondary drive circuit (20); The third end of the first conduction control module (101) and the third end of the dead time control module (102) are respectively used for electrically connecting the first power supply voltage, and the fourth end of the first conduction control module (101) and the fourth end of the dead time control module (102) are respectively used for grounding; The first conduction control module (101) is used for turning on the first conduction control module (101) when the first control signal is a first preset signal. The dead time control module (102) is used for outputting a drive control signal of a first target level to the secondary drive circuit (20) after a charging delay duration when the first conduction control module (101) is in a conduction state.
3. The half bridge drive circuit of claim 2, wherein, The first conduction control module (101) comprises a first switch unit (1011) and a first protection unit (1012), wherein: The first end of the first switch unit (1011) is used for receiving the first control signal, the second end of the first switch unit (1011) is electrically connected with the first end of the first protection unit (1012) and the first end of the dead time control module (102), respectively, the third end of the first switch unit (1011) is used for grounding, and the second end of the first protection unit (1012) is used for electrically connecting the first power supply voltage.
4. The half bridge drive circuit of claim 2, wherein, The dead time control module (102) comprises a second switch unit (1021), a second protection unit (1022) and a delay control unit (1023), wherein: The first end of the second switch unit (1021) is electrically connected with the second end of the first conduction control module (101), the second end of the second switch unit (1021) is electrically connected with the first end of the second protection unit (1022) and the first end of the delay control unit (1023) respectively, the second end of the second protection unit (1022) is used for electrically connecting the first power supply voltage, the second end of the delay control unit (1023) is electrically connected with the first end of the secondary drive circuit (20), and the third end of the second switch unit (1021) and the third end of the delay control unit (1023) are used for grounding respectively.
5. The half bridge drive circuit of claim 4, wherein, The delay control unit (1023) comprises a slow start subunit (10231) and a voltage stabilizing subunit (10232), wherein: The first end of the slow start subunit (10231) and the first end of the voltage stabilizing subunit (10232) are electrically connected with the second end of the second switch unit (1021) and the first end of the second protection unit (1022) respectively, the second end of the slow start subunit (10231) is used for grounding, and the second end of the voltage stabilizing subunit (10232) is electrically connected with the first end of the secondary drive circuit (20); The slow start subunit (10231) is used for charging the slow start subunit (10231) when the first conduction control module (101) is in a conduction state; The voltage stabilizing subunit (10232) is used for turning on the voltage stabilizing subunit (10232) to output a driving control signal of a first target level to the secondary drive circuit (20) when the voltage of the slow start subunit (10231) is greater than or equal to a preset voltage corresponding to the voltage stabilizing subunit (10232); wherein the charging delay time length is the time length required for charging the voltage of the slow start subunit (10231) to the preset voltage.
6. The half-bridge drive circuit according to any one of claims 1 to 5, characterized in that The secondary drive circuit (20) comprises a second conduction control module (201), a third conduction control module (202) and a push-pull output module (203), wherein: The first end of the second conduction control module (201) is electrically connected with the second end of the primary drive circuit (10), the second end of the second conduction control module (201) is electrically connected with the first end of the third conduction control module (202), the second end of the third conduction control module (202) is electrically connected with the first end of the push-pull output module (203), and the second end of the push-pull output module (203) is used for electrically connecting the first end of the half-bridge circuit (30). The third end of the second conduction control module (201), the third end of the third conduction control module (202) and the third end of the push-pull output module (203) are electrically connected to the first power supply voltage respectively; the fourth end of the second conduction control module (201), the fourth end of the third conduction control module (202) and the fourth end of the push-pull output module (203) are grounded respectively; The second conduction control module (201) is configured to turn on the second conduction control module (201) when the drive control signal is a second preset signal. The third conduction control module (202) is configured to turn off the third conduction control module (202) when the second conduction control module (201) is in a conduction state. The push-pull output module (203) is configured to output a first drive signal of a second target level to the half-bridge circuit (30) to drive the module in the half-bridge circuit (30) electrically connected to the push-pull output module (203) to be turned on when the third conduction control module (202) is in an off state.
7. The half-bridge drive circuit of claim 6, wherein, The second conduction control module (201) comprises a third switch unit (2011) and a third protection unit (2012), wherein: The first end of the third switch unit (2011) is electrically connected to the second end of the primary drive circuit (10), the second end of the third switch unit (2011) is electrically connected to the first end of the third conduction control module (202) and the first end of the third protection unit (2012) respectively, the third end of the third switch unit (2011) is grounded, and the second end of the third protection unit (2012) is electrically connected to the first power supply voltage; The third conduction control module (202) comprises a fourth switch unit (2021) and a fourth protection unit (2022), wherein: The first end of the fourth switch unit (2021) is electrically connected to the second end of the second conduction control module (201), the second end of the fourth switch unit (2021) is electrically connected to the first end of the push-pull output module (203) and the fourth protection unit (2022) respectively, the third end of the fourth switch unit (2021) is grounded, and the second end of the fourth protection unit (2022) is electrically connected to the first power supply voltage.
8. The half bridge drive circuit of claim 6, wherein, The push-pull output module (203) comprises a push-pull unit (2031) and an on-drive unit (2032), wherein: The first end of the push-pull unit (2031) is electrically connected to the second end of the third conduction control module (202), the second end of the push-pull unit (2031) is electrically connected to the first end of the on-drive unit (2032), the third end of the push-pull unit (2031) is grounded, the fourth end of the push-pull unit (2031) is electrically connected to the first power supply voltage, and the second end of the on-drive unit (2032) is electrically connected to the first end of the half-bridge circuit (30).
9. The half-bridge drive circuit according to any one of claims 1, 2, 3, 4, 5, 7 and 8, characterized in that, The circuit further comprises the half-bridge circuit (30), and the half-bridge circuit (30) comprises a first half-bridge switch module (301) and a second half-bridge switch module (302), wherein: a first end of the first half-bridge switch module (301) is electrically connected with a second end of the secondary drive circuit (20), a second end of the first half-bridge switch module (301) is used for grounding; a first end of the second half-bridge switch module (302) is used for receiving a second drive signal, a second end of the second half-bridge switch module (302) is used for electrically connecting a second power supply voltage, a third end of the first half-bridge switch module (301) and a third end of the second half-bridge switch module (302) are used for electrically connecting a load; wherein the second drive signal is opposite to the first drive signal; the half-bridge circuit (30) is used for outputting a load control signal to the load according to the received first drive signal and second drive signal.
10. An electronic device, comprising: The electronic device comprises a device body and the half-bridge drive circuit according to any one of claims 1-9.