High-side drive circuits, power supply units, and vehicles

Abstract

This application relates to a high-side drive circuit, a power supply device, and a vehicle, and pertains to the field of power drive technology. The high-side drive circuit includes a master switch module, a first drive module, and a bridge arm connected in series between a first power supply terminal and a second power supply terminal. The first drive module is connected to the output terminal of the bridge arm and is used to obtain a drive voltage based on the output voltage of the bridge arm. The master switch module is connected in series to the high-side circuit and is used to maintain the high-side circuit in a conducting state based on the drive voltage. By connecting the first drive module to the output terminal of the bridge arm, it can obtain a drive voltage based on the output voltage of the bridge arm, thus achieving a sufficiently large drive voltage under high-voltage conditions. The master switch module is connected in series to the high-side circuit and maintains the high-side circuit in a conducting state based on the obtained drive voltage. This ensures that the high-side drive circuit can operate continuously and stably, thereby achieving stable driving of the high-side drive circuit.

Description

Technical Field

[0001] This application relates to the field of power drive technology, and in particular to a high-side drive circuit, power supply device, and vehicle. Background Technology

[0002] In the vehicle's electrical system, high-side drive circuits are used to control multiple actuators in the vehicle body. High-side drive circuits are usually connected between the power supply and the actuators and are located on the high potential side of the power supply. They are responsible for transmitting electrical energy to the actuators to drive them effectively, thereby enabling the actuators to perform corresponding actions.

[0003] Currently, high-side drive circuits are typically located between the high-voltage end of the power supply (e.g., high voltage greater than 300V) and the load. This prevents low-voltage control signals from directly controlling switching devices in high-voltage environments. Even with isolation devices to isolate the low-voltage control signals, the high-side drive circuit's conduction state may not be stably maintained due to insufficient drive voltage. Therefore, maintaining stable conduction of high-voltage drive circuits is a pressing issue that needs to be addressed. Summary of the Invention

[0004] This application provides a high-side drive circuit that maintains stable conduction of the high-voltage drive circuit, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a high-side drive circuit is provided, including a master switch module, a first drive module, and a bridge arm connected in series between a first power supply terminal and a second power supply terminal. The first driving module is connected to the output terminal of the bridge arm and is used to obtain the driving voltage based on the output voltage of the bridge arm; The main switch module is connected in series to the high-side circuit and is used to maintain the high-side circuit in a conducting state according to the driving voltage.

[0006] Optionally, the first drive module includes a unidirectional conduction circuit and an energy storage circuit; The unidirectional conduction circuit is connected to the bridge arm and the main switch module, and is used to maintain the high-side loop in a conducting state and charge the energy storage circuit when the output terminal of the bridge arm is in a conducting state with the first power supply terminal as the driving voltage transmitted from the first power supply terminal. The energy storage circuit is connected to the unidirectional conduction circuit and the main switch module, and is used to maintain the high-side loop in the conduction state by using the discharge voltage of the energy storage circuit as the driving voltage when the output terminal of the bridge arm and the second power supply terminal are in the conduction state. Wherein, the second power supply voltage transmitted in the high-side loop is less than or equal to the first power supply voltage.

[0007] Optionally, the unidirectional conduction circuit includes a first diode, which includes an anode connected to the output terminal of the bridge arm and a cathode connected to the energy storage circuit and the main switch module.

[0008] Optionally, the energy storage circuit includes a first capacitor; The first capacitor includes a first terminal connected to the first diode and the main switch module, and a second terminal grounded.

[0009] Optionally, it also includes a first isolation device connected between the first drive module and the main switch module and used for receiving switch control signals; The first isolation device is used to disconnect the first drive module and the main switch module when the switch control signal is at a first level, so as to disconnect the high-side loop; and to connect the first drive module and the main switch module when the switch control signal is at a second level, so as to maintain the high-side loop in a conducting state according to the drive voltage.

[0010] Optionally, the main switch module includes a first switch transistor; The first switching transistor includes a first electrode for receiving the second power supply voltage, a second electrode connected to a subsequent circuit powered by the second power supply voltage, and a control electrode connected to the first isolation device.

[0011] Optionally, the first drive module includes multiple bridge arms, and includes multiple unidirectional conduction circuits. The output terminal of each bridge arm is connected to the input terminal of one of the unidirectional conduction circuits, and the output terminal of each unidirectional conduction circuit is connected to the energy storage circuit and the main switch module.

[0012] Optionally, it further includes a second drive module, each of the second drive modules being connected to one of the bridge arms; the bridge arm includes a second switch and a third switch; the second switch is connected in series between the first power supply terminal and the output terminal of the bridge arm, and the first switch is connected in series between the output terminal of the bridge arm and the second power supply terminal; The second drive module includes a second isolation device, a second diode, and a second capacitor; The second isolation device includes a first input terminal for receiving a first driving signal, a second input terminal for receiving a second driving signal, a third input terminal connected to the second diode and the second capacitor, a fourth input terminal for receiving a third power supply voltage, a first output terminal connected to the control electrode of the second switching transistor, and a second output terminal connected to the control electrode of the third switching transistor. The second capacitor includes a first end connected to the output terminal of the bridge arm and a second end connected to the cathode of the second diode and the third input terminal of the second isolation device; The anode of the second diode is used to connect to the third power supply voltage.

[0013] According to a second aspect of this application, a power supply device is provided, including a power battery pack and the aforementioned high-side drive circuit; the output terminal of the power battery pack is connected to the high-side circuit for providing a second power supply voltage to the high-side circuit.

[0014] According to a third aspect of this application, a vehicle is provided, including the aforementioned power supply device. In summary, in the high-side drive circuit of this application embodiment, firstly, by connecting the first drive module to the output terminal of the bridge arm, it can obtain a drive voltage based on the output voltage of the bridge arm, thus achieving a sufficiently large drive voltage under high-voltage conditions. Secondly, the main switch module is connected in series to the high-side loop and maintains the high-side loop in a conducting state based on the obtained drive voltage. This ensures that the high-side drive circuit can operate continuously and stably, thereby achieving stable driving of the high-side drive circuit.

[0015] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram of a high-side driving circuit provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of another high-side driving circuit provided in an exemplary embodiment of this disclosure; Figure 3 This is a circuit diagram of a high-side driving circuit provided in an exemplary embodiment of this disclosure; Figure 4 This is a circuit diagram of another high-side driving circuit provided in an exemplary embodiment of this disclosure; Figure 5 This is a circuit diagram of yet another high-side drive circuit provided in an exemplary embodiment of this disclosure; Figure 6 This is a schematic diagram of a vehicle provided in an exemplary embodiment of this disclosure.

[0018] Explanation of reference numerals in the attached diagram: 1. Main switch module; 2. First drive module; 21. One-way conduction circuit; 22. Energy storage circuit; 3. Bridge arm; 4. Second drive module; D1. First diode; D2. Second diode; Q1. First switching transistor; Q2. Second switching transistor; Q3. Third switching transistor; C1. First capacitor; C2. Second capacitor; U1. First isolation device; U2. Second isolation device; Hom. Switch control signal; Hx. First drive signal; Lx. Second drive signal. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] According to the first aspect of this application, referring to Figures 1 to 4 This disclosure provides a high-side drive circuit, including a master switch module 1, a first drive module 2, and a bridge arm 3 connected in series between a first power supply terminal and a second power supply terminal. The first drive module 2 is connected to the output terminal of the bridge arm 3 and is used to obtain a drive voltage based on the output voltage of the bridge arm 3. The master switch module 1 is connected in series to the high-side loop and is used to maintain the high-side loop in a conducting state based on the drive voltage.

[0021] As an example, a high-side circuit can be a high-voltage circuit in a vehicle's Electronic Stability Program (ESP) system, such as a circuit with a voltage level exceeding 300V. The ESP system is an active safety system in a vehicle. When sensors detect a deviation between the vehicle's actual driving direction and the driver's intention, such as understeer or oversteer tending during cornering, the ESP system can quickly identify this and power the corresponding actuators via the high-side drive circuit to correct the vehicle's trajectory. For example, in the event of understeer, energy can be supplied through the high-side circuit to apply braking to the inner rear wheel, generating a steering torque. In the event of oversteer, energy can be supplied through the high-side circuit to brake the outer front wheel, thereby restoring the vehicle to a stable driving state.

[0022] As an example, bridge arm 3 can reuse any phase of bridge arm 3 in the power module of the vehicle's drive motor, and the output voltage of bridge arm 3 in the power module of the drive motor is high voltage, so that the drive voltage obtained from the output voltage is large enough to maintain the conduction state of the main switch module 1.

[0023] In the above embodiment, firstly, by connecting the first driving module 2 to the output terminal of the bridge arm 3, it can obtain a driving voltage based on the output voltage of the bridge arm 3, thus achieving a sufficiently large driving voltage under high-voltage conditions. Secondly, the main switch module 1 is connected in series to the high-side circuit and maintains the high-side circuit in a conducting state based on the obtained driving voltage. In this way, the high-side driving circuit can be ensured to operate continuously and stably, thereby achieving stable driving of the high-side driving circuit.

[0024] Reference Figure 3 In some embodiments, the first driving module 2 includes a unidirectional conduction circuit 21 and an energy storage circuit 22. The unidirectional conduction circuit 21 is connected to the bridge arm 3 and the main switch module 1, and is used to maintain the high-side loop in a conducting state by using the first power supply voltage transmitted from the first power supply terminal as the driving voltage when the output terminal of the bridge arm 3 is in a conducting state with the first power supply terminal, and to charge the energy storage circuit 22. The energy storage circuit 22 is connected to the unidirectional conduction circuit 21 and the main switch module 1, and is used to maintain the high-side loop in a conducting state by using the discharge voltage of the energy storage circuit 22 as the driving voltage when the output terminal of the bridge arm 3 is in a conducting state with the second power supply terminal. The second power supply voltage transmitted in the high-side loop is less than or equal to the first power supply voltage.

[0025] As an example, HV1 represents the first power supply terminal, and HGND represents the second power supply terminal. Since the driving voltage of the main switch module 1 is obtained based on the first power supply voltage, the first power supply voltage acts on the control electrode of the main switch module 1, while the second power supply voltage flows through the main switch module 1. Only when the second power supply voltage transmitted in the high-side loop is less than or equal to the first power supply voltage can a potential difference be maintained between the voltage of the control electrode of the main switch module 1 and the voltage flowing through the main switch module 1 to meet the conduction condition of the main switch module 1, thereby providing effective drive for the main switch module 1 to maintain the conduction state of the main switch module 1.

[0026] In the above embodiment, firstly, when the output terminal of bridge arm 3 is in a conducting state with the first power supply terminal, the unidirectional conduction circuit 21 can use the first power supply voltage transmitted from the first power supply terminal as the driving voltage to maintain the high-side loop in a conducting state, while also charging the energy storage circuit 22. Secondly, since the second power supply terminal is a low potential terminal or a ground terminal, when the output terminal of bridge arm 3 is in a conducting state with the second power supply terminal, the energy storage circuit 22 needs to use its own discharge voltage as the driving voltage to continue maintaining the high-side loop in a conducting state. At the same time, since the second power supply voltage transmitted in the high-side loop is less than or equal to the first power supply voltage, the driving voltage obtained from the first power supply voltage can stably maintain the main switch module 1 in a conducting state, so that the high-side loop is conducting and transmits the second power supply voltage.

[0027] Reference Figure 3 In some embodiments, the unidirectional conduction circuit 21 includes a first diode D1, which includes an anode connected to the output terminal of the bridge arm 3 and a cathode connected to the energy storage circuit 22 and the main switch module 1.

[0028] Reference Figure 3 In some embodiments, the energy storage circuit 22 includes a first capacitor C1. The first capacitor C1 includes a first terminal connected to the first diode D1 and the main switch module 1, and a second terminal grounded.

[0029] As an example, when the output terminal of bridge arm 3 is in a conducting state with the first power supply terminal, the first power supply voltage transmitted from the first power supply terminal flows from the anode to the cathode of the first diode D1. At this time, the first diode D1 conducts, using the first power supply voltage as the driving voltage to power the main switch module 1, maintaining the main switch module 1 in a conducting state. Simultaneously, the first power supply voltage flows to the first capacitor C1 to charge it. When the output terminal of bridge arm 3 is in a conducting state with the second power supply terminal, since the second power supply terminal is a low potential terminal or grounded terminal, the first capacitor C1 begins to discharge, and outputs the discharge voltage as the driving voltage, continuing to maintain the main switch module 1 in a conducting state. Thus, during the alternating conduction process of bridge arm 3, the high-side loop can always be maintained.

[0030] Reference Figure 3 In some embodiments, a first isolation device U1 is further included, connected between the first drive module 2 and the main switch module 1, and used to receive a switch control signal Hom. The first isolation device U1 is used to disconnect the connection between the first drive module 2 and the main switch module 1 when the switch control signal Hom is at a first level, thereby disconnecting the high-side loop. And when the switch control signal Hom is at a second level, it controls the connection between the drive module 2 and the main switch module 1, so that the main switch module 1 maintains the high-side loop in a conducting state according to the drive voltage.

[0031] As an example, the first isolation device U1 may be an optocoupler, which includes a collector for receiving switch control signals Hom, a grounded emitter, an anode connected to the cathode of the first diode D1 and the first terminal of the first capacitor C1, and a cathode connected to the main switch module 1.

[0032] For example, the first level state can be a low level state, and the second level state can be a high level state. When the switch control signal Hom is in the first level state, the collector of the first isolation device U1 is connected to the switch control signal Hom. Since the switch control signal Hom is in a low level state, the light-emitting diode inside the first isolation device U1 cannot conduct and emit light, causing the phototransistor inside the first isolation device U1 to be cut off. This prevents the driving voltage transmitted by the first capacitor C1 and the first diode D1 from being transmitted to the main switch module 1 through the phototransistor inside the first isolation device U1. At this time, the main switch module 1 cannot maintain conduction, thereby disconnecting the high-side circuit. When the switch control signal Hom changes to the second level, the collector of the first isolation device U1 is connected to the switch control signal Hom. Since the switch control signal Hom is at a high level, the light-emitting diode inside the first isolation device U1 is turned on and emits light, thereby triggering the phototransistor inside the first isolation device U1 to turn on. The phototransistor, after being turned on, transmits the driving voltage transmitted by the first capacitor C1 and the first diode D1 to the main switch module 1, thereby driving the main switch module 1 to turn on, thus turning on the high-side circuit.

[0033] Thus, the first isolation device U1 can achieve isolation between the switch control signal Hom and the high-side circuit side (e.g., above 300V), and can control the on / off state of the high-side circuit through the switch control signal Hom on the low-voltage side (e.g., below 12V). Furthermore, the first isolation device U1 can be a common isolation device, without the need for a high-side driver chip.

[0034] In some embodiments, the main switch module 1 includes a first switch transistor Q1. The first switch transistor Q1 includes a first electrode for connecting to a second power supply voltage, a second electrode connected to a subsequent circuit powered by the second power supply voltage, and a control electrode connected to a first isolation device U1.

[0035] As an example, refer to Figure 4 The subsequent circuit is any functional circuit powered by the second power supply voltage. The main switch module 1 is the power supply switch for the functional circuit. When the main switch module 1 is in the on state, the high-side circuit is turned on to power on the subsequent circuit; when the main switch module 1 is in the off state, the high-side circuit is turned off to power off the subsequent circuit. In this way, the power-on control of the functional circuit can be realized.

[0036] As an example, refer to Figure 5The subsequent circuit can also be the motor drive module in the vehicle. In this case, the bridge arm 3 can reuse the bridge arm in the motor drive module. The first power supply voltage and the second power supply voltage are from the same voltage source. The main switch module 1 is connected in series with each bridge arm 3 in the drive module, so as to realize the power-on control of the motor drive module.

[0037] Reference Figure 5 In some embodiments, the high-side drive circuit includes multiple bridge arms 3, the first drive module 2 includes multiple unidirectional conduction circuits 21, the output terminal of each bridge arm 3 is connected to the input terminal of a unidirectional conduction circuit 21, and the output terminal of each unidirectional conduction circuit 21 is connected to the energy storage circuit 22 and the main switch module 1.

[0038] As an example, bridge arm 3 includes a second switch Q2 and a third switch Q3. The second switch Q2 is connected in series between the first power supply terminal and the output terminal of bridge arm 3, and the third switch Q3 is connected in series between the output terminal of bridge arm 3 and the second power supply terminal.

[0039] As an example, taking the bridge arm 3 in the drive module of the multiplexed motor as an example, bridge arm 3 can be set to three, to be used to output U-phase voltage, V-phase voltage, and W-phase voltage respectively. When the second switch Q2 in the first bridge arm 3 is turned on and the third switch Q3 is turned off, the first power supply voltage transmitted from the first power supply terminal can be transmitted to the output terminal of bridge arm 3 through the turned-on second switch Q2, thereby outputting a U-phase positive voltage at the output terminal of the first bridge arm 3. Conversely, when the second switch Q2 in the first bridge arm 3 is turned off and the third switch Q3 is turned on, the current flows from the output terminal of the first bridge arm 3 through the third switch Q3 to the second power supply terminal, thereby outputting a U-phase negative voltage. Similarly, when the second switch Q2 in the second bridge arm 3 is turned on and the third switch Q3 is turned off, the output terminal of the second bridge arm 3 outputs a V-phase positive voltage. Conversely, when the second switch Q2 in the second bridge arm 3 is turned off and the third switch Q3 is turned on, a V-phase negative voltage is output. When the second switch Q2 in the third bridge arm 3 is turned on and the third switch Q3 is turned off, the output terminal of the third bridge arm 3 outputs a positive W-phase voltage. Conversely, when the second switch Q2 in the third bridge arm 3 is turned off and the third switch Q3 is turned on, a negative W-phase voltage is output. Thus, by alternately controlling the on / off states of the second and third switches Q2 and Q3 in the three bridge arms 3 according to a preset timing sequence, the output terminals of the three bridge arms 3 can output U-phase voltage, V-phase voltage, and W-phase voltage, which are 120° out of phase, respectively, providing three-phase power to the vehicle's motor.

[0040] As an example, the output of each bridge arm 3 is connected to the input of a unidirectional conduction circuit 21. All unidirectional conduction circuits 21 are connected to the energy storage circuit 22 and the main switch module 1. When the output of any bridge arm 3 is in a conducting state with the first power supply terminal, the corresponding unidirectional conduction circuit 21 can use the first power supply voltage transmitted from the first power supply terminal as the driving voltage. Since the bridge arm 3 can reuse the bridge arms in the motor drive module, three bridge arms 3 can be set, each corresponding to a unidirectional conduction circuit 21. When the output of the first bridge arm 3 is conducting with the first power supply terminal, the first power supply voltage is transmitted to the main switch module 1 and the first capacitor C1 through the unidirectional conduction circuit 21 connected to the output of the first bridge arm 3, serving as the driving voltage to maintain the conduction of the high-side loop. Similarly, when the output of the second or third bridge arm 3 is conducting with the first power supply terminal, the corresponding unidirectional conduction circuit 21 transmits the first power supply voltage to the main switch module 1 and the first capacitor C1. This achieves redundant configuration of the driving voltage path.

[0041] It should be noted that a second drive module 4 is also provided between the output terminal of each bridge arm 3 and the input terminal of a unidirectional conduction circuit 21. Figure 5 Only the second drive module 4 for the first bridge arm 3 used to output the U-phase voltage is shown in the diagram; the second drive module 4 for outputting the V-phase voltage and the W-phase voltage is not shown.

[0042] In some embodiments, the high-side drive circuit further includes a second drive module 4, each second drive module 4 being connected to a bridge arm 3. The second drive module 4 includes a second isolation device U2, a second diode D2, and a second capacitor C2. The second isolation device U2 includes a first input terminal for receiving a first drive signal Hx, a second input terminal for receiving a second drive signal Lx, a third input terminal connected to the second diode D2 and the second capacitor C2, a fourth input terminal for receiving a third power supply voltage, a first output terminal connected to the control electrode of the second switch Q2, and a second output terminal connected to the control electrode of the first switch Q1. The second capacitor C2 includes a first terminal connected to the output terminal of the bridge arm 3 and a second terminal connected to the cathode of the second diode D2 and the third input terminal of the second isolation device U2. The anode of the second diode D2 is used to receive the third power supply voltage.

[0043] Reference Figure 5As an example, the second isolation device U2 can be composed of two optocouplers. When the first drive signal Hx is in a low-level state, the light-emitting diode of the first optocoupler in the second isolation device U2 cannot conduct and emit light, causing the phototransistor in the first optocoupler to be cut off. This prevents the voltage transmitted by the second diode D2 and the second capacitor C2 from being transmitted to the control electrode of the second switch Q2 through the phototransistor, thus turning off the second switch Q2. However, when the first drive signal Hx is in a high-level state, the light-emitting diode of the second optocoupler in the second isolation device U2 conducts and emits light, causing the phototransistor in the second optocoupler to conduct. The phototransistor, after being turned on, will continue to transmit the voltage transmitted through the second diode D2 and the second capacitor C2 to the control electrode of the second switch Q2, thereby driving the second switch Q2 to conduct. Furthermore, since the control electrode potential of the second switch Q2 needs to be greater than the potential of the output electrode of the second switch Q2, that is, greater than the potential of the output terminal of bridge arm 3, the second diode D2 and the second capacitor C2 can maintain the second switch Q2 continuously conducting during the conduction period, and will not be cut off due to the rise of the potential at the output terminal of bridge arm 3, thereby realizing the on-off control of the second switch Q2.

[0044] As an example, since the output electrode of the third switch Q3 is connected to the second power supply terminal, its potential is low, and the third switch Q3 can be driven by only the third power supply voltage. For instance, when the second drive signal Lx is low, the LED inside the second optocoupler in the second isolation device U2 is not conducting, the phototransistor is cut off, and the third power supply voltage cannot be transmitted to the control electrode of the third switch Q3 through the phototransistor, so the third switch Q3 is cut off. When the second drive signal Lx is high, the LED inside the second optocoupler conducts and emits light, triggering the phototransistor inside the second optocoupler to conduct. The third power supply voltage is then transmitted to the control electrode of the third switch Q3 through the conducting phototransistor, driving the third switch Q3 to conduct, thereby realizing the on / off control of the second switch Q2.

[0045] Thus, the alternating conduction of the second switch Q2 and the third switch Q3 can be achieved through the first drive signal Hx and the second drive signal Lx.

[0046] This disclosure exemplarily describes the operation of the high-side drive circuit: First, the second switch Q2 and the third switch Q3 in the bridge arm 3 are switched alternately by the first drive signal Hx and the second drive signal Lx. After a first preset time, the first switch Q1 is turned on by the switch control signal Hom. After the first switch Q1 is turned on for a second preset time, the second switch Q2 and the third switch Q3 in each bridge arm 3 can be controlled by the first drive signal Hx and the second drive signal Lx corresponding to each bridge arm 3 to drive the three-phase bridge normally.

[0047] Reference Figure 6 According to a second aspect of this application, a power supply device is provided, including a power battery pack 100 and the aforementioned high-side drive circuit 200. The output terminal of the power battery pack 100 is connected to the high-side circuit for providing a second power supply voltage to the high-side circuit.

[0048] The power supply device has all the beneficial effects of the aforementioned high-side drive circuit, which will not be repeated here.

[0049] According to a third aspect of this application, a vehicle is provided, including the aforementioned power supply device. The vehicle may be a plug-in hybrid electric vehicle or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0050] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0051] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0052] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0053] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A high-side driving circuit, characterized in that, It includes a main switch module, a first drive module, and a bridge arm connected in series between the first power supply terminal and the second power supply terminal; The first driving module is connected to the output terminal of the bridge arm and is used to obtain the driving voltage based on the output voltage of the bridge arm; The main switch module is connected in series to the high-side circuit and is used to maintain the high-side circuit in a conducting state according to the driving voltage.

2. The high-side driving circuit according to claim 1, characterized in that, The first driving module includes a unidirectional conduction circuit and an energy storage circuit; The unidirectional conduction circuit is connected to the bridge arm and the main switch module, and is used to maintain the high-side loop in a conducting state and charge the energy storage circuit when the output terminal of the bridge arm is in a conducting state with the first power supply terminal as the driving voltage transmitted from the first power supply terminal. The energy storage circuit is connected to the unidirectional conduction circuit and the main switch module, and is used to maintain the high-side loop in the conduction state by using the discharge voltage of the energy storage circuit as the driving voltage when the output terminal of the bridge arm and the second power supply terminal are in the conduction state. Wherein, the second power supply voltage transmitted in the high-side loop is less than or equal to the first power supply voltage.

3. The high-side driving circuit according to claim 2, characterized in that, The unidirectional conduction circuit includes a first diode, which includes an anode connected to the output terminal of the bridge arm and a cathode connected to the energy storage circuit and the main switch module.

4. The high-side driving circuit according to claim 3, characterized in that, The energy storage circuit includes a first capacitor; The first capacitor includes a first terminal connected to the first diode and the main switch module, and a second terminal grounded.

5. The high-side driving circuit according to claim 2, characterized in that, It also includes a first isolation device connected between the first drive module and the main switch module and used for receiving switch control signals; The first isolation device is used to disconnect the first drive module and the main switch module when the switch control signal is at a first level, so as to disconnect the high-side loop; and to connect the first drive module and the main switch module when the switch control signal is at a second level, so as to maintain the high-side loop in a conducting state according to the drive voltage.

6. The high-side driving circuit according to claim 5, characterized in that, The main switch module includes a first switch transistor; The first switching transistor includes a first electrode for receiving the second power supply voltage, a second electrode connected to a subsequent circuit powered by the second power supply voltage, and a control electrode connected to the first isolation device.

7. The high-side driving circuit according to claim 2, characterized in that, The first drive module includes multiple bridge arms, and includes multiple unidirectional conduction circuits. The output terminal of each bridge arm is connected to the input terminal of one of the unidirectional conduction circuits, and the output terminal of each unidirectional conduction circuit is connected to the energy storage circuit and the main switch module.

8. The high-side driving circuit according to claim 1, characterized in that, It also includes a second drive module, each of which is connected to one of the bridge arms; the bridge arm includes a second switch and a third switch; the second switch is connected in series between the first power supply terminal and the output terminal of the bridge arm, and the third switch is connected in series between the output terminal of the bridge arm and the second power supply terminal; The second drive module includes a second isolation device, a second diode, and a second capacitor; The second isolation device includes a first input terminal for receiving a first driving signal, a second input terminal for receiving a second driving signal, a third input terminal connected to the second diode and the second capacitor, a fourth input terminal for receiving a third power supply voltage, a first output terminal connected to the control electrode of the second switching transistor, and a second output terminal connected to the control electrode of the third switching transistor. The second capacitor includes a first end connected to the output terminal of the bridge arm and a second end connected to the cathode of the second diode and the third input terminal of the second isolation device; The anode of the second diode is used to connect to the third power supply voltage.

9. A power supply device, characterized in that, It includes a power battery pack and a high-side drive circuit as described in any one of claims 1 to 8; the output terminal of the power battery pack is connected to the high-side circuit to provide a second power supply voltage to the high-side circuit.

10. A vehicle, characterized in that, Includes the power supply device as described in claim 9.

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