A drive control circuit and energy storage power supply

Abstract

The utility model discloses an embodiment of driving control circuit and energy storage power supply, and the circuit includes: second energy storage module, push -pull drive module is used for when the control signal is low level, and the output first drive signal is in high level, and the output second drive signal. First energy storage module is used for under the action of first drive signal, and the first charging circuit that forms through push -pull drive module exports charging voltage conduction power switch tube, negative pressure control module is used for responding charging voltage, and the second charging circuit is formed for the second energy storage module charging, under the action of second drive signal, and negative pressure control module forms the discharge circuit of second energy storage module and makes second energy storage module produce negative voltage, and push -pull drive module responds negative voltage and produces negative pressure drive signal and shuts off power switch tube. Through double energy storage cooperation and negative pressure quick cut -off mechanism, make power switch tube be in deep cut -off state, improved the anti -interference ability of floating ground upper bridge arm drive circuit, reduced the upper and lower bridge arm straight -through risk.

Description

Technical Field

[0001] This utility model relates to the field of switching transistor driving, and in particular to a driving control circuit and an energy storage power supply. Background Technology

[0002] In the field of power electronics conversion technology, bridge circuit topologies such as full-bridge, H-bridge, half-bridge, and push-pull are widely used in switching power supplies, inverters, and motor drives. These circuit topologies typically include upper-arm and lower-arm power switches, which are mostly MOSFETs, IGBTs, or SiC MOSFETs. The source or emitter of the lower-arm power switch is directly connected to ground, making driving relatively simple; however, the source or emitter of the upper-arm power switch is connected to the midpoint output terminal of the bridge arm. This midpoint potential changes dynamically with the switching state and is in a floating state, making driving it more challenging.

[0003] In traditional bridge arm drive schemes, the gate drive voltage of the power switch must be relative to the floating source. During switching, especially when driving inductive loads or RCD snubber circuits, the drastic voltage change generated at the midpoint of the bridge arm is coupled to the gate through the parasitic capacitance between the gate and source of the power switch, forming an interference voltage.

[0004] Existing power switches, especially SiC MOSFETs, feature low threshold voltages (typically 2-4V) and fast switching speeds, which reduce switching losses and improve efficiency. However, they are also more susceptible to interference. When interference voltage is superimposed on the gate, it can cause the upper bridge arm power switch, which is in a state of shutdown, to be falsely triggered to turn on. Furthermore, the threshold voltage of SiC MOSFETs drifts with temperature and operating conditions, further increasing the risk of false triggering. If both the upper and lower bridge arms turn on simultaneously, a shoot-through short circuit will be formed on the bus, causing device damage or even system failure.

[0005] In the existing technology, although there are solutions to increase the turn-off drive voltage or use negative voltage drive, there is a lack of effective negative voltage generation and rapid application mechanism. It is difficult to reliably keep the power switching transistor in a deep cut-off state under high-speed switching and strong interference environments. The anti-interference capability is insufficient and cannot fully meet the reliability and safety requirements of high-performance power electronic systems. Utility Model Content

[0006] The main technical problem solved by this utility model embodiment is to provide a drive control circuit and energy storage power supply, which can solve at least some of the defects existing in the drive control circuit of the power switching transistor.

[0007] In a first aspect, this utility model provides a drive control circuit, comprising: a second energy storage module; a push-pull drive module connected to the second energy storage module and a power switch, configured to receive a control signal, output a first drive signal when the control signal is low, and output a second drive signal when the control signal is high; a first energy storage module connected to the push-pull drive module, configured to output a charging voltage through a first charging circuit formed by the push-pull drive module under the action of the first drive signal, thereby turning on the power switch; a negative voltage control module connected to the first energy storage module, the second energy storage module, the push-pull drive module, and the power switch, configured to form a second charging circuit with the first energy storage module in response to the charging voltage, thereby charging the second energy storage module; and to form a discharge circuit with the push-pull drive module in response to the second drive signal, thereby generating a negative voltage in the second energy storage module; the push-pull drive module is further configured to generate a negative voltage drive signal in response to the negative voltage, thereby turning off the power switch; the source of the power switch is in a floating state.

[0008] Optionally, the negative pressure control module includes a first switching unit and a second switching unit; the first switching unit is connected to the push-pull drive module, the first energy storage module, the second energy storage module, and the power switch, and is used to form a second charging circuit with the first energy storage module in response to the charging voltage being turned on, so as to charge the second energy storage module; the second switching unit is connected to the push-pull drive module, the first energy storage module, the second energy storage module, and the power switch, and is used to form the discharge circuit with the push-pull drive module in response to the second drive signal being turned on, so as to generate the negative voltage in the second energy storage module.

[0009] Optionally, the first switching unit includes a second diode, an eighth switching transistor, a thirteenth resistor, and a fourteenth resistor; the first end of the thirteenth resistor is connected to the push-pull drive module, the second end of the thirteenth resistor is connected to the first end of the fourteenth resistor and the base of the eighth switching transistor, the collector of the eighth switching transistor is connected to the cathode of the second diode, the anode of the second diode is connected to the push-pull drive module and the second energy storage module, and the emitter of the eighth switching transistor is connected to the second end of the fourteenth resistor, the first energy storage module, and the source of the power switching transistor.

[0010] Optionally, the second switching unit includes a seventh switching transistor, a third resistor, an eighth resistor, a twelfth resistor, and a fifteenth resistor; the first end of the twelfth resistor is connected to the push-pull drive module, the second end of the twelfth resistor is connected to the second end of the fifteenth resistor and the base of the seventh switching transistor, the first end of the fifteenth resistor is connected to the second end of the eighth resistor, the emitter of the seventh switching transistor, the first energy storage module, and the source of the power switching transistor, the collector of the seventh switching transistor is connected to the second end of the third resistor, the first end of the third resistor is connected to the first energy storage module, and the first end of the third resistor is also connected to the power supply voltage.

[0011] Optionally, the push-pull drive module includes a second resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first switch, a second switch, a fourth switch, a fifth switch, and a sixth switch; the first terminal of the sixth resistor is connected to the control signal, the second terminal of the sixth resistor is connected to the first terminal of the ninth resistor and the base of the fifth switch, the collector of the fifth switch is connected to the base of the first switch, the emitter of the fifth switch is connected to the first terminal of the tenth resistor, and the second terminals of the ninth and tenth resistors are connected to a reference ground; the emitter of the first switch is connected to the power supply voltage, and the collector of the first switch is connected to the first terminal of the fifth resistor and the base of the fifth switch. The negative voltage control module is described above. The second terminal of the fifth resistor is connected to the base of the sixth switch and the first terminal of the eleventh resistor. The collector of the sixth switch is connected to the second terminal of the second resistor, the base of the second switch, the base of the fourth switch, and the first terminal of the seventh resistor. The emitter of the sixth switch is connected to the second terminal of the eleventh resistor, the second terminal of the seventh resistor, the collector of the fourth switch, the second energy storage module, and the negative voltage control module. The collector of the second switch is connected to the power supply voltage. The emitter of the second switch is connected to the emitter of the fourth switch, the first terminal of the fourth resistor, and the negative voltage control module. The second terminal of the fourth resistor is connected to the gate of the power switch.

[0012] Optionally, the drive control circuit further includes a power supply module connected to the push-pull drive module, the negative pressure control module, and the first energy storage module, for providing power supply voltage to the push-pull drive module, the negative pressure control module, and the first energy storage module.

[0013] Optionally, the power module includes a first diode and a first resistor, the anode of the first diode is connected to the input voltage, the cathode of the first diode is connected to the first end of the first resistor, and the second end of the first resistor is connected to the push-pull drive module, the negative voltage control module, and the first energy storage module.

[0014] Optionally, the first energy storage module includes a first electrolytic capacitor, a first end of which is connected to the negative voltage control module and the push-pull drive module, the first end of which is also connected to the power supply voltage, and the second end of which is connected to the negative voltage control module.

[0015] Optionally, the second energy storage module includes a second capacitor and a third diode; the first end of the second capacitor is connected to the anode of the third diode, the push-pull drive module, and the negative voltage control module, and the second end of the second capacitor is connected to the cathode of the third diode and the negative voltage control module.

[0016] Secondly, this utility model provides an energy storage power supply, including: the drive control circuit as described in the first aspect.

[0017] The beneficial effects of this embodiment are as follows: Unlike the prior art, this embodiment uses a push-pull drive module to output a first drive signal and a second drive signal according to the level of the control signal. Under the action of the first drive signal, the first energy storage module turns on the power switch through the first charging circuit, while the negative voltage control module simultaneously pre-charges the second energy storage module. Under the action of the second drive signal, the negative voltage control module controls the second energy storage module to discharge, generating a negative voltage, which is then applied to the control electrode of the power switch. Through the combination of dual energy storage and the negative voltage fast turn-off mechanism, the power switch is kept in a deep cutoff state, improving the anti-interference capability of the floating bridge arm drive circuit and reducing the risk of shoot-through between the upper and lower bridge arms. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a schematic diagram of the structure of a drive control circuit provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of another drive control circuit provided by an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a negative pressure control module provided by an embodiment of the present invention; Figure 4 This is a circuit diagram of a drive control circuit provided by an embodiment of the present invention. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0022] In some embodiments of this application, a drive control circuit is provided, the schematic diagram of which is shown below. Figure 1 As shown, the drive control circuit 10 is used to drive the power switch 20. The source of the power switch 20 is in a floating state, which is suitable for the application scenario of the floating bridge arm in the bridge circuit topology.

[0023] Specifically, the drive control circuit 10 includes a first energy storage module 120, a second energy storage module 140, a push-pull drive module 110, and a negative pressure control module 130.

[0024] In some embodiments of this application, the push-pull drive module 110 is connected to the second energy storage module 140 and the power switch 20. The push-pull drive module 110 receives a control signal, which can be a pulse width modulation (PWM) signal or a sinusoidal pulse width modulation (SPWM) signal. The push-pull drive module 110 outputs different drive signals according to the level of the control signal: when the control signal is low, the push-pull drive module 110 outputs a first drive signal; when the control signal is high, the push-pull drive module 110 outputs a second drive signal.

[0025] The first and second drive signals are used to control the operating state of the subsequent circuits, thereby controlling the power switch 20 to turn on and off.

[0026] In some embodiments of this application, the first energy storage module 120 is connected to the push-pull drive module 110. The first energy storage module 120 is used to store the main energy required for driving. Under the action of the first drive signal, the first energy storage module 120 outputs a charging voltage through the first charging circuit formed by the push-pull drive module 110. The charging voltage is applied to the control electrode of the power switch 20, thereby turning on the power switch 20.

[0027] Specifically, when the push-pull drive module 110 outputs the first drive signal, the state of the relevant switching elements inside the push-pull drive module 110 changes, enabling the first energy storage module 120 to form a charging path, i.e., a first charging circuit, to the control electrode of the power switch 20 via the push-pull drive module 110. Through the first charging circuit, the energy stored in the first energy storage module 120 is transferred to the control electrode of the power switch 20 in the form of a charging voltage. When the charging voltage reaches the conduction threshold of the power switch 20, the power switch 20 is turned on.

[0028] In some embodiments of this application, the second energy storage module 140 is used to store the energy required for negative pressure drive. The second energy storage module 140 is connected to the push-pull drive module 110 and the negative pressure control module 130.

[0029] In some embodiments of this application, the negative pressure control module 130 is connected to the first energy storage module 120, the second energy storage module 140, the push-pull drive module 110, and the power switch 20. The negative pressure control module 130 has two operating modes.

[0030] By way of example and not limitation, in the first operating mode, the negative voltage control module 130 responds to the charging voltage. When the first energy storage module 120 outputs the charging voltage, the charging voltage is applied not only to the control electrode of the power switch 20 but also to the negative voltage control module 130. Under the influence of the charging voltage, the negative voltage control module 130 and the first energy storage module 120 form a second charging circuit. Through the second charging circuit, the first energy storage module 120 charges the second energy storage module 140, preparing energy reserves for the subsequent generation of negative voltage.

[0031] It is easy to understand that the first charging circuit and the second charging circuit exist simultaneously within the same time period. That is, during the period when the control signal is at a low level and the push-pull drive module 110 outputs the first drive signal, the first energy storage module 120 charges the power switch 20 through the first charging circuit to turn it on, and at the same time charges the second energy storage module 140 through the second charging circuit.

[0032] By way of example and not limitation, in the second operating mode, the negative pressure control module 130 responds to the second drive signal. When the control signal is high, the push-pull drive module 110 outputs the second drive signal. After receiving the second drive signal, the negative pressure control module 130 forms a discharge circuit with the push-pull drive module 110 for the second energy storage module 140. Through the discharge circuit, the second energy storage module 140 releases the previously stored energy and generates a negative voltage during the discharge process.

[0033] In some embodiments of this application, the push-pull drive module 110 is also configured to respond to a negative voltage. When the second energy storage module 140 generates a negative voltage, the push-pull drive module 110 generates a negative voltage drive signal based on the negative voltage. The negative voltage drive signal is applied to the control electrode of the power switch 20, causing the control electrode of the power switch 20 to present a negative voltage state relative to its source electrode, thereby quickly turning off the power switch 20 and placing it in a deep cutoff state.

[0034] By applying a negative voltage to the control electrode of the power switch 20 relative to the floating source, the voltage between the control electrode and the source can be pulled to a negative value region far below the threshold voltage. Even if there is a large interference voltage coupled to the control electrode, the total voltage after superposition is still difficult to reach the conduction threshold, thereby significantly improving the anti-interference capability, avoiding false triggering of the power switch 20, and effectively reducing the risk of shoot-through of the upper and lower bridge arms.

[0035] In summary, in some embodiments of this application, the drive control circuit 10 outputs a first drive signal and a second drive signal respectively through the push-pull drive module 110 according to the level state of the control signal. When the control signal is low, the first energy storage module 120 charges and turns on the power switch 20 through the first charging circuit under the action of the first drive signal, while the negative voltage control module 130 pre-charges the second energy storage module 140 in response to the charging voltage. When the control signal is high, the negative voltage control module 130 responds to the second drive signal and controls the second energy storage module 140 to discharge through the discharge circuit to generate a negative voltage. The push-pull drive module 110 generates a negative voltage drive signal based on the negative voltage and applies it to the control electrode of the power switch 20 to achieve rapid turn-off.

[0036] Through the combination of the above dual energy storage modules and the negative voltage fast turn-off mechanism, the drive control circuit 10 can keep the power switch 20 of the floating bridge arm in a deep cut-off state during the turn-off period, which improves the anti-interference capability of the drive circuit and effectively reduces the shoot-through risk of the upper and lower bridge arms. It is suitable for power devices with low threshold voltage and high switching speed such as MOSFET, IGBT, and SiC MOSFET, and has good reliability and safety under strong interference conditions such as inductive load or RCD load.

[0037] In some embodiments of this application, another drive control circuit is provided, the schematic diagram of which is shown below. Figure 2 As shown, Figure 2 As shown, the drive control circuit 10, based on the previous embodiment, also includes a power supply module 150.

[0038] Specifically, the power module 150 is connected to the push-pull drive module 110, the negative pressure control module 130, and the first energy storage module 120. The power module 150 is used to provide power supply voltage to the push-pull drive module 110, the negative pressure control module 130, and the first energy storage module 120.

[0039] In some embodiments of this application, the power module 150 receives an external input voltage and converts or transmits the input voltage as a supply voltage. The supply voltage serves as the operating power source for the drive control circuit 10, providing energy to each module.

[0040] By way of example and not limitation, power module 150 provides power supply voltage to push-pull drive module 110, enabling push-pull drive module 110 to normally receive control signals and output first drive signal and second drive signal. Power module 150 provides power supply voltage to negative voltage control module 130, enabling negative voltage control module 130 to normally perform charging control and discharging control functions. Power module 150 provides power supply voltage to first energy storage module 120, enabling first energy storage module 120 to store drive energy and output charging voltage when needed.

[0041] The first energy storage module 120 needs to continuously or periodically obtain energy from the power supply module 150. During the operation of the drive control circuit 10, the first energy storage module 120 provides charging voltage to the control electrode of the power switch 20 through the first charging circuit, and simultaneously provides charging energy to the second energy storage module 140 through the second charging circuit. The energy stored in the first energy storage module 120 will gradually be consumed. The power supply module 150 replenishes the energy of the first energy storage module 120 by providing a supply voltage, ensuring that the first energy storage module 120 can operate continuously and stably.

[0042] In some embodiments of this application, the power module 150 can provide power supply voltage to each module under different control signal level states. When the control signal is low, the power supply voltage provided by the power module 150 supports the push-pull drive module 110 to output a first drive signal, supports the first energy storage module 120 to turn on the power switch 20 through the first charging circuit, and supports the negative voltage control module 130 to charge the second energy storage module 140. When the control signal is high, the power supply voltage provided by the power module 150 supports the push-pull drive module 110 to output a second drive signal, supports the negative voltage control module 130 to control the second energy storage module 140 to discharge and generate a negative voltage, and simultaneously replenishes the energy of the first energy storage module 120.

[0043] Specifically, the power module 150 can charge the first energy storage module 120 during a high-level control signal. When the control signal is high and the power switch 20 is off, the power module 150 provides charging current to the first energy storage module 120 to replenish the energy consumed by the first energy storage module 120 in the previous cycle. Through periodic energy replenishment, the first energy storage module 120 can stably provide the charging voltage and the energy required to charge the second energy storage module 140 in each control cycle.

[0044] In some embodiments of this application, the power module 150 can be implemented using various circuit configurations, such as rectifier circuits, filter circuits, and current limiting circuits. The specific circuit structure of the power module 150 can be designed according to actual application requirements, as long as it can provide a stable power supply voltage for the push-pull drive module 110, the negative voltage control module 130, and the first energy storage module 120.

[0045] In summary, in some embodiments of this application, the drive control circuit 10, by adding a power supply module 150, achieves unified power supply to each functional module and energy replenishment to the first energy storage module 120. The power supply module 150 provides a stable energy source for the drive control circuit 10, ensuring that the push-pull drive module 110, the negative voltage control module 130, and the first energy storage module 120 can operate continuously and stably, thereby guaranteeing reliable turn-on and turn-off control of the power switch 20.

[0046] By periodically replenishing the first energy storage module 120 with energy from the power module 150, the drive control circuit 10 can operate stably for a long time, continuously providing positive charging voltage and negative driving signal in continuous switching cycles, maintaining reliable control over the floating bridge arm power switch 20, and further improving the stability and reliability of the drive circuit.

[0047] In some embodiments of this application, please refer to Figure 3 , Figure 3 This is a schematic diagram of the negative pressure control module provided in an embodiment of this utility model. Figure 3 As shown, the negative pressure control module 130 includes a first switching unit 131 and a second switching unit 132.

[0048] Specifically, the first switching unit 131 is connected to the push-pull drive module 110, the first energy storage module 120, the second energy storage module 140, and the power switch 20. The second switching unit 132 is connected to the push-pull drive module 110, the first energy storage module 120, the second energy storage module 140, and the power switch 20.

[0049] In some embodiments of this application, the first switching unit 131 is used to turn on in response to a charging voltage. When the first energy storage module 120 outputs a charging voltage under the action of the first drive signal, the charging voltage is applied not only to the control electrode of the power switch 20 through the first charging circuit, but also transmitted to the first switching unit 131. After receiving the charging voltage, the internal switching element of the first switching unit 131 changes from the off state to the on state, thereby turning on the first switching unit 131.

[0050] As an example and not a limitation, the charging voltage can be applied directly to the control terminal of the first switching unit 131, or it can be processed by a voltage divider circuit before being applied to the control terminal of the first switching unit 131. When the voltage applied to the control terminal reaches the conduction threshold of the first switching unit 131, the first switching unit 131 is turned on.

[0051] It is easy to understand that after the first switching unit 131 is turned on, it forms a second charging circuit with the first energy storage module 120. Through the second charging circuit, the energy of the first energy storage module 120 is transferred to the second energy storage module 140 via the first switching unit 131, thereby charging the second energy storage module 140. The second energy storage module 140 stores energy during the charging process, preparing for the subsequent generation of a negative voltage.

[0052] In some embodiments of this application, the conduction of the first switching unit 131 is related to the action of the first driving signal. When the control signal is low and the push-pull driving module 110 outputs the first driving signal, the first energy storage module 120 outputs a charging voltage, which turns on the first switching unit 131. Therefore, the conduction time of the first switching unit 131 is basically consistent with the conduction time of the power switching transistor 20, that is, during the conduction period of the power switching transistor 20, the first switching unit 131 is also in the conducting state, and the second energy storage module 140 completes charging during the conduction period of the power switching transistor 20.

[0053] In some embodiments of this application, the second switching unit 132 is used to turn on in response to a second drive signal. When the control signal is high, the push-pull drive module 110 outputs the second drive signal. The second drive signal is transmitted to the second switching unit 132, causing the internal switching element of the second switching unit 132 to change from a cutoff state to a conduction state, thereby turning on the second switching unit 132.

[0054] As an example and not a limitation, the second drive signal can be applied directly to the control terminal of the second switching unit 132, or it can be processed by a voltage divider circuit before being applied to the control terminal of the second switching unit 132. When the signal applied to the control terminal meets the conduction condition of the second switching unit 132, the second switching unit 132 is turned on.

[0055] It is easy to understand that after the second switching unit 132 is turned on, it forms a discharge circuit for the second energy storage module 140 with the push-pull drive module 110. Through the discharge circuit, the second energy storage module 140 releases the previously stored energy. During the discharge process, due to the specific configuration of the discharge circuit, the potential at one end of the second energy storage module 140 drops, thereby generating a negative voltage.

[0056] Specifically, the formation of the discharge circuit causes the energy storage terminal of the second energy storage module 140 to have a negative potential relative to the source of the power switch 20. The negative voltage is transmitted to the push-pull drive module 110 via the discharge circuit. The push-pull drive module 110 responds to the negative voltage by generating a negative voltage drive signal. The negative voltage drive signal is applied to the control electrode of the power switch 20, causing the control electrode of the power switch 20 to have a negative voltage state relative to the floating source, thereby quickly turning off the power switch 20 and putting it in a deep cutoff state.

[0057] In some embodiments of this application, the first switching unit 131 and the second switching unit 132 operate alternately in time. When the control signal is low, the first switching unit 131 is turned on and the second switching unit 132 is turned off, at which time the second energy storage module 140 is in a charging state. When the control signal is high, the second switching unit 132 is turned on and the first switching unit 131 is turned off, at which time the second energy storage module 140 is in a discharging state and generates a negative voltage.

[0058] By alternately turning on and off the first switching unit 131 and the second switching unit 132, the charging and discharging control of the second energy storage module 140 is realized, ensuring that the second energy storage module 140 can charge and store energy during the conduction period of the power switch 20 and discharge to generate a negative voltage during the turn-off period of the power switch 20.

[0059] In some embodiments of this application, the charging path of the second charging circuit formed between the first switching unit 131 and the first energy storage module 120, and the discharge path of the discharge circuit formed between the second switching unit 132 and the push-pull drive module 110, may include various circuit elements and connection methods. The specific circuit structure of the first switching unit 131 and the second switching unit 132 can be designed according to actual application requirements, as long as it can realize the functions of responding to the charging voltage and responding to the second drive signal.

[0060] In summary, in some embodiments of this application, the negative pressure control module 130 achieves charging and discharging control of the second energy storage module 140 through the division of labor and cooperation between the first switching unit 131 and the second switching unit 132. The first switching unit 131 is turned on in response to the charging voltage, charging the second energy storage module 140 during the period when the power switch 20 is turned on; the second switching unit 132 is turned on in response to the second drive signal, controlling the second energy storage module 140 to discharge and generate a negative voltage during the period when the power switch 20 is turned off.

[0061] Through the refinement of the first switching unit 131 and the second switching unit 132, the drive control circuit 10 can reliably realize the dual energy storage cooperation mechanism, ensuring that the second energy storage module 140 has sufficient energy storage to generate negative voltage when needed, thereby ensuring the effective application of the negative voltage drive signal, improving the anti-interference capability when the power switch 20 is turned off, and reducing the risk of shoot-through between the upper and lower bridge arms.

[0062] In some embodiments of this application, please refer to Figure 4 , Figure 4 This is a circuit diagram of the drive control circuit provided in an embodiment of this utility model. Figure 4 As shown, the drive control circuit 10 includes a push-pull drive module 110, a first energy storage module 120, a negative voltage control module 130, a second energy storage module 140, and a power supply module 150, which are used to drive the power switching transistor 20.

[0063] Specifically, the power switch 20 can be a power semiconductor device such as a MOSFET, IGBT, or SiC MOSFET. The power switch 20 includes a control electrode (gate or base), a first current terminal (drain or collector), and a second current terminal (source or emitter). The first current terminal of the power switch 20 is connected to the bus voltage BUS, and the second current terminal is the source, which is in a floating state. In this embodiment, the power switch 20 is a MOSFET, labeled Q3, with the control electrode as the gate and the second current terminal as the source.

[0064] In some embodiments of this application, the power module 150 includes a first diode D1 and a first resistor R1. The anode of the first diode D1 is connected to the input voltage VCC+, and the cathode of the first diode D1 is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the push-pull drive module 110, the negative voltage control module 130, and the first energy storage module 120, providing the aforementioned modules with the power supply voltage VCC.

[0065] It's easy to understand that the first diode D1 serves as both a unidirectional conductor and an isolation protection mechanism, preventing reverse current flow. The first resistor R1 limits the current, restricting the charging current and protecting the circuit. Through the cooperation of the first diode D1 and the first resistor R1, the power module 150 can safely and stably provide power to each module.

[0066] In some embodiments of this application, the first energy storage module 120 includes a first electrolytic capacitor CE1. The first terminal (positive) of the first electrolytic capacitor CE1 is connected to the second terminal of the first resistor R1 of the power module 150, thereby connecting to the supply voltage VCC. The first terminal of the first electrolytic capacitor CE1 is also connected to the first terminal of the third resistor R3 of the negative voltage control module 130 and the first terminal of the second resistor R2 of the push-pull drive module 110. The second terminal (negative) of the first electrolytic capacitor CE1 is connected to the emitter of the eighth switch Q8, the emitter of the seventh switch Q7, the second terminal of the eighth resistor R8, the second terminal of the fourteenth resistor R14, the second terminal of the fifteenth resistor R15 of the negative voltage control module 130, and the source of the power switch 20.

[0067] By way of example and not limitation, the first electrolytic capacitor CE1 is used to store the energy required for driving. When the power module 150 provides charging current, the first electrolytic capacitor CE1 charges and stores electrical energy. Under the action of the first drive signal, the first electrolytic capacitor CE1 releases energy through the first charging circuit to charge the gate of the power switch 20. At the same time, the first electrolytic capacitor CE1 provides charging energy to the second energy storage module 140 through the second charging circuit.

[0068] In some embodiments of this application, the second energy storage module 140 includes a second capacitor C2 and a third diode D3. The first terminal of the second capacitor C2 is connected to the anode of the third diode D3, the emitter of the sixth switch Q6 of the push-pull drive module 110, the collector of the fourth switch Q4, the second terminal of the seventh resistor R7, and the anode of the second diode D2 of the first switching unit 131 of the negative voltage control module 130.

[0069] The second terminal of the second capacitor C2 is connected to the cathode of the third diode D3, the collector of the seventh switch Q7, and the second terminal of the third resistor R3.

[0070] Specifically, the energy of the first electrolytic capacitor CE1 is transferred to the second capacitor C2 through the negative voltage control module 130, whereby the second capacitor C2 is charged and stores energy. In the discharge circuit, the second capacitor C2 releases energy and generates a negative voltage.

[0071] In some embodiments of this application, the negative pressure control module 130 includes a first switching unit 131 and a second switching unit 132. Specifically, the first switching unit 131 includes a second diode D2, an eighth switching transistor Q8, a thirteenth resistor R13, and a fourteenth resistor R14.

[0072] Specifically, the first terminal of the thirteenth resistor R13 is connected to point A. Point A is the connection point between the emitter of the second switch Q2, the emitter of the fourth switch Q4, and the first terminal of the fourth resistor R4. The second terminal of the thirteenth resistor R13 is connected to the first terminal of the fourteenth resistor R14 and the base of the eighth switch Q8. The collector of the eighth switch Q8 is connected to the cathode of the second diode D2. The anode of the second diode D2 is connected to the first terminal of the second capacitor C2 of the second energy storage module 140. The emitter of the eighth switch Q8 is connected to the second terminal of the fourteenth resistor R14, the second terminal of the first electrolytic capacitor CE1 of the first energy storage module 120, and the source of the power switch 20.

[0073] It's easy to understand that the thirteenth resistor R13 and the fourteenth resistor R14 form a voltage divider circuit. When a charging voltage exists at point A, the charging voltage, after being divided by the thirteenth resistor R13 and the fourteenth resistor R14, provides a control voltage to the base of the eighth switch Q8. When the divided voltage reaches the conduction threshold of the eighth switch Q8, the eighth switch Q8 turns on.

[0074] By way of example and not limitation, in this embodiment, the eighth switch Q8 can be an NPN transistor or an N-channel MOSFET. When the eighth switch Q8 is an NPN transistor, the base receives the divided control voltage. When the base-emitter voltage exceeds the turn-on threshold (approximately 0.7V), the eighth switch Q8 turns on, and a conduction path is formed between the collector and emitter.

[0075] When the eighth switch Q8 is turned on, the energy of the first electrolytic capacitor CE1 forms a circuit through the third resistor R3, the second capacitor C2, the second diode D2, and the eighth switch Q8, charging the second capacitor C2. The second diode D2 ensures that the charging current flows in one direction, preventing the second capacitor C2 from discharging in reverse to the eighth switch Q8.

[0076] The second switching unit 132 includes a seventh switch Q7, a third resistor R3, an eighth resistor R8, a twelfth resistor R12, and a fifteenth resistor R15.

[0077] Specifically, the first terminal of the twelfth resistor R12 is connected to the collector of the first switch Q1 of the push-pull drive module 110 and the first terminal of the fifth resistor R5. The second terminal of the twelfth resistor R12 is connected to the second terminal of the fifteenth resistor R15 and the base of the seventh switch Q7. The first terminal of the fifteenth resistor R15 is connected to the second terminal of the eighth resistor R8, the emitter of the seventh switch Q7, and the source of the power switch 20. The collector of the seventh switch Q7 is connected to the second terminal of the third resistor R3 and the second terminal of the second capacitor C2. The first terminal of the third resistor R3 is connected to the first terminal of the first electrolytic capacitor CE1 of the first energy storage module 120, and the first terminal of the third resistor R3 is also connected to the supply voltage VCC. The first terminal of the eighth resistor R8 is connected to the second terminal of the fourth resistor and the gate of the power switch Q3.

[0078] It's easy to understand that the twelfth resistor R12 and the fifteenth resistor R15 form a voltage divider circuit. When the push-pull drive module 110 outputs the second drive signal, the second drive signal, after being divided by the twelfth resistor R12 and the fifteenth resistor R15, provides a control voltage to the base of the seventh switch Q7. When the voltage after voltage division reaches the conduction threshold of the seventh switch Q7, the seventh switch Q7 turns on.

[0079] By way of example and not limitation, in this embodiment, the seventh switch Q7 can be an NPN transistor or an N-channel MOSFET. When the seventh switch Q7 is an NPN transistor, the base receives the divided control voltage. When the base-emitter voltage exceeds the conduction threshold, the seventh switch Q7 is turned on, and a conduction path is formed between the collector and emitter.

[0080] When the seventh switch Q7 is turned on, the second capacitor C2 forms a discharge circuit through the seventh switch Q7 and the eighth resistor R8. During the discharge process, the electrical energy of the second capacitor C2 is released through the discharge circuit. The eighth resistor R8 acts as a current limiter, controlling the discharge speed.

[0081] In some embodiments of this application, the push-pull drive module 110 includes a second resistor R2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first switch Q1, a second switch Q2, a fourth switch Q4, a fifth switch Q5, and a sixth switch Q6.

[0082] The first terminal of the sixth resistor R6 is connected to the control signal PWM. The second terminal of the sixth resistor R6 is connected to the first terminal of the ninth resistor R9 and the base of the fifth switching transistor Q5. The collector of the fifth switching transistor Q5 is connected to the base of the first switching transistor Q1. The emitter of the fifth switching transistor Q5 is connected to the first terminal of the tenth resistor R10. The second terminals of the ninth resistor R9 and the tenth resistor R10 are connected to the reference ground GND.

[0083] It's easy to understand that the sixth resistor R6 limits current and protects the fifth switch Q5. Simultaneously, the ninth resistor R9 and the sixth resistor R6 provide bias resistors for the fifth switch Q5. When the control signal PWM is low, the fifth switch Q5 is not turned on, and the base of the first switch Q1 is pulled high internally, so the first switch Q1 is not turned on. When the control signal PWM is high, the fifth switch Q5 turns on, and the base of the first switch Q1 is pulled low, so the first switch Q1 turns on.

[0084] The emitter of the first switching transistor Q1 is connected to the supply voltage VCC. The collector of the first switching transistor Q1 is connected to the first terminal of the fifth resistor R5 and the first terminal of the twelfth resistor R12 of the negative voltage control module 130. The second terminal of the fifth resistor R5 is connected to the base of the sixth switching transistor Q6 and the first terminal of the eleventh resistor R11.

[0085] By way of example and not limitation, in this embodiment, the first switching transistor Q1 can be a PNP transistor or a P-channel MOSFET. When the control signal PWM is high, the first switching transistor Q1 is turned on, and the supply voltage VCC provides a high-level control voltage to the base of the sixth switching transistor Q6 through the first switching transistor Q1 and the fifth resistor R5. At the same time, VCC provides a high-level control voltage to the base of the seventh switching transistor Q7 after being divided by the first switching transistor Q1, the twelfth resistor R12, and the fifteenth resistor R15, thus forming the second drive signal.

[0086] The collector of the sixth switch Q6 is connected to the second terminal of the second resistor R2, the base of the second switch Q2, the base of the fourth switch Q4, and the first terminal of the seventh resistor R7. The emitter of the sixth switch Q6 is connected to the second terminal of the eleventh resistor R11, the second terminal of the seventh resistor R7, the collector of the fourth switch Q4, and the first terminal of the second capacitor C2 of the second energy storage module 140.

[0087] The collector of the second switching transistor Q2 is connected to the supply voltage VCC. The emitter of the second switching transistor Q2 is connected to point A. Point A is also connected to the emitter of the fourth switching transistor Q4 and the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 is connected to the gate of the power switching transistor 20.

[0088] It's easy to understand that when the control signal PWM is low, the fifth switch Q5 is not turned on, the first switch Q1 is not turned on, and the sixth switch Q6 is not turned on. The second resistor R2 and the seventh resistor R7 divide the voltage of the first electrolytic capacitor CE1, providing control voltage to the base of the second switch Q2 and the base of the fourth switch Q4.

[0089] Specifically, the first terminal of the second resistor R2 is connected to the first terminal of the first electrolytic capacitor CE1 (supply voltage VCC). When the sixth switch Q6 is not turned on, the supply voltage VCC, after being divided by the second resistor R2 and the seventh resistor R7, provides a high level to the bases of the second switch Q2 and the fourth switch Q4. Since the second switch Q2 and the fourth switch Q4 are PNP transistors or P-channel MOSFETs, when the base is at a high level, the fourth switch Q4 is not turned on, and the second switch Q2 is turned on.

[0090] When the second switch Q2 is turned on, the energy of the first electrolytic capacitor CE1 flows through the second switch Q2 to point A, and then through the fourth resistor R4 to form the first charging circuit, charging the parasitic capacitance C1 between the gate and source of the power switch 20. When the charging voltage reaches the threshold voltage of the power switch 20, the power switch 20 turns on. The fourth resistor R4 acts as a current limiter, controlling the charging speed.

[0091] In some embodiments of this application, the parasitic capacitance C1 is the inherent capacitance between the gate and source of the power switch 20, and is labeled C1 in the figure. The first charging circuit charges the parasitic capacitance C1, causing the gate potential to rise relative to the source. When the gate-source voltage Vgs exceeds the threshold voltage Vth, the power switch 20 is turned on.

[0092] When the control signal PWM is high, the fifth switch Q5 and the first switch Q1 are turned on. The supply voltage VCC provides a high level to the base of the sixth switch Q6 through the first switch Q1 and the fifth resistor R5, turning on the sixth switch Q6. After the sixth switch Q6 is turned on, the bases of the second switch Q2 and the fourth switch Q4 are pulled low, with the second switch Q2 not turning on and the fourth switch Q4 turning on.

[0093] Simultaneously, the seventh switch Q7 turns on in response to the second drive signal. The second capacitor C2 forms a discharge circuit through the seventh switch Q7, the eighth resistor R8, the fourth resistor R4, and the fourth switch Q4. During the discharge process, the fourth resistor R4 and the parasitic resistance Rce of the sixth switch Q6 form a voltage divider. Since the resistance of the fourth resistor R4 is much larger than the parasitic resistance Rce of the sixth switch Q6, the voltage divider causes point A to present a negative voltage relative to the source of the power switch 20.

[0094] It is easy to understand that during the discharge process of the second capacitor C2, through a specific discharge circuit and voltage division relationship, a negative potential is formed at point A relative to the source of the power switch 20. The negative voltage is transferred to the gate of the power switch 20 through the fourth resistor R4, making the gate present a negative voltage relative to the source. The gate-source voltage Vgs is negative, and the power switch 20 is quickly turned off and enters a deep cutoff state.

[0095] In some embodiments of this application, when the control signal PWM is low, the push-pull drive module 110 outputs a first drive signal, driving the control circuit 10 to enter the power switch conduction stage. The specific working process is as follows: Specifically, when the control signal PWM is low, the control signal is transmitted to the base of the fifth switch Q5 through the sixth resistor R6. Since PWM is low, the base voltage of the fifth switch Q5 is insufficient to turn it on, so the fifth switch Q5 is in the off state, and its gate or base is a low-level signal.

[0096] It is easy to understand that when the fifth switch Q5 is turned off, the collector of the fifth switch Q5 presents a high-impedance state. The base of the first switch Q1 obtains a high-level signal through internal bias. The first switch Q1 is a PNP type transistor, and it does not conduct when its base is at a high level. Therefore, the first switch Q1 is in the off state.

[0097] When the first switch Q1 is off, the supply voltage VCC cannot be transmitted to the fifth resistor R5 and the twelfth resistor R12 through the first switch Q1. The base of the sixth switch Q6 cannot receive a high-level drive signal, and its gate or base is a low-level signal, so the sixth switch Q6 is in the off state. Similarly, the base of the seventh switch Q7 also cannot receive a high-level drive signal, and its gate or base is a low-level signal, so the seventh switch Q7 is in the off state.

[0098] In some embodiments of this application, when the sixth switch Q6 is turned off, the first electrolytic capacitor CE1 begins to discharge. The first terminal (positive terminal) of the first electrolytic capacitor CE1 is connected to the supply voltage VCC, and the voltage of the first electrolytic capacitor CE1 is transmitted through the second resistor R2 to the connection point between the second resistor R2 and the collector of the sixth switch Q6.

[0099] Specifically, the first terminal of the second resistor R2 is connected to the positive terminal of the first electrolytic capacitor CE1, and the second terminal of the second resistor R2 is connected to the first terminal of the seventh resistor R7, the base of the second switching transistor Q2, and the base of the fourth switching transistor Q4. The second terminal of the seventh resistor R7 is connected to the emitter of the sixth switching transistor Q6, the collector of the fourth switching transistor Q4, and the first terminal of the second capacitor C2. Since the sixth switching transistor Q6 is off, the second resistor R2 and the seventh resistor R7 form a voltage divider circuit to divide the voltage of the first electrolytic capacitor CE1.

[0100] It's easy to understand that the voltage after voltage division is applied to the bases of the second switch Q2 and the fourth switch Q4. Both the second switch Q2 and the fourth switch Q4 are PNP transistors. After voltage division by the second resistor R2 and the seventh resistor R7, the gate or base of the fourth switch Q4 is at a high level, and Q4 is not turned on. Simultaneously, the gate or base of the second switch Q2 is at a high level, but due to the voltage division relationship and the bias design of the second switch Q2, the second switch Q2 is turned on.

[0101] As an example, and not a limitation, when the second switch Q2 is turned on, the energy of the first electrolytic capacitor CE1 is transferred to point A through the second switch Q2. The collector of the second switch Q2 is connected to the supply voltage VCC, and the emitter of the second switch Q2 is connected to point A. Point A is connected to the first terminal of the fourth resistor R4, and the second terminal of the fourth resistor R4 is connected to the gate of the power switch 20.

[0102] Specifically, the voltage of the first electrolytic capacitor CE1 charges the gate-source parasitic capacitance C1 of the power switch 20 through the second switch Q2, point A, and the fourth resistor R4. The fourth resistor R4 limits the current and controls the charging speed. As the charging process proceeds, the voltage across the parasitic capacitance C1 gradually increases, meaning the gate potential of the power switch 20 gradually increases relative to the source.

[0103] It's easy to understand that the parasitic capacitance C1 is the inherent capacitance between the gate and source of power switch 20, labeled C1 in the diagram. When the voltage across parasitic capacitance C1 reaches the threshold voltage of power switch 20, power switch 20 turns on. After power switch 20 turns on, a low-resistance path is formed between its drain (connected to the bus voltage BUS) and source, causing the source potential to rise. Since point A is connected to the gate through the fourth resistor R4, point A also has a charging voltage when the gate is charging.

[0104] In some embodiments of this application, when the power switch 20 is turned on and point A has a charging voltage, the charging voltage at point A provides a control voltage to the base of the eighth switch Q8 through a voltage divider circuit formed by the thirteenth resistor R13 and the fourteenth resistor R14.

[0105] Specifically, the first terminal of the thirteenth resistor R13 is connected to point A, and the second terminal of the thirteenth resistor R13 is connected to the first terminal of the fourteenth resistor R14 and the base of the eighth switch Q8. The second terminal of the fourteenth resistor R14 is connected to the emitter of the eighth switch Q8 and the source of the power switch 20. The charging voltage at point A is divided by the thirteenth resistor R13 and the fourteenth resistor R14, causing the gate or base of the eighth switch Q8 to receive a high-level signal, thus turning on the eighth switch Q8.

[0106] It is easy to understand that when the eighth switch Q8 is turned on, a low-resistance path is formed between the collector and emitter of the eighth switch Q8. The collector of the eighth switch Q8 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the first terminal of the second capacitor C2.

[0107] As an example and not a limitation, the electrical energy stored in the first electrolytic capacitor CE1 forms a second charging circuit through the third resistor R3, the second capacitor C2, the second diode D2, and the eighth switch Q8, thereby enabling the first electrolytic capacitor CE1 to charge the second capacitor C2.

[0108] In some embodiments of this application, after the second charging circuit is established, the electrical energy of the first electrolytic capacitor CE1 charges the second capacitor C2 through the second charging circuit. The charging current flows out from the positive terminal of the first electrolytic capacitor CE1, passes through the third resistor R3, flows through the second capacitor C2 to charge it, and then flows back to the negative terminal of the first electrolytic capacitor CE1 through the second diode D2 and the eighth switch Q8.

[0109] Specifically, the third resistor R3 acts as a current limiter in the charging circuit, controlling the charging current to the second capacitor C2. The second diode D2 ensures that the charging current flows in one direction, preventing the second capacitor C2 from discharging towards the eighth switch Q8 at other stages. As the charging process progresses, the voltage across the second capacitor C2 gradually increases, and the stored energy gradually increases, preparing energy reserves for the subsequent generation of a negative voltage.

[0110] In some embodiments of this application, while the control signal PWM remains at a low level, both the first charging circuit and the second charging circuit are continuously present. The power switch 20 remains in the on state, and the charging voltage at point A is maintained. The first electrolytic capacitor CE1 maintains the charging state of the gate of the power switch 20 through the first charging circuit, and maintains the charging state of the second capacitor C2 through the second charging circuit.

[0111] In some embodiments of this application, when the control signal PWM is high, the push-pull drive module 110 outputs a second drive signal, driving the control circuit 10 to enter the power switch turn-off stage. The specific working process is as follows: Specifically, when the control signal PWM changes from low to high, the control signal is transmitted to the base of the fifth switch Q5 through the sixth resistor R6. Since PWM is high, the gate or base of the fifth switch Q5 receives a high-level signal, and the fifth switch Q5 is turned on.

[0112] It's easy to understand that when the fifth switch Q5 is turned on, a low-resistance path is formed between its collector and emitter, pulling the base of the first switch Q1 low through Q5. Since the gate or base of the first switch Q1 is a low-level signal, and Q1 is a PNP transistor, it conducts when its base is low; therefore, Q1 is turned on.

[0113] As an example and not a limitation, when the first switch Q1 is turned on, the supply voltage VCC is transmitted to the collector of the first switch Q1 through the first switch Q1. The collector of the first switch Q1 is connected to the first terminal of the fifth resistor R5 and the first terminal of the twelfth resistor R12.

[0114] Specifically, the supply voltage VCC, through a voltage divider circuit formed by the fifth resistor R5 and the eleventh resistor R11, provides a control voltage to the base of the sixth switch Q6. The second terminal of the fifth resistor R5 is connected to the base of the sixth switch Q6 and the first terminal of the eleventh resistor R11. The second terminal of the eleventh resistor R11 is connected to the emitter of the sixth switch Q6, the second terminal of the seventh resistor R7, the collector of the fourth switch Q4, and the first terminal of the second capacitor C2.

[0115] It is easy to understand that after the voltage is divided by the fifth resistor R5 and the eleventh resistor R11, the gate or base of the sixth switch Q6 receives a high-level signal, and the sixth switch Q6 is turned on.

[0116] In some embodiments of this application, the supply voltage VCC is simultaneously transmitted to the first terminal of the twelfth resistor R12 via the first switch Q1. The supply voltage VCC provides a control voltage to the base of the seventh switch Q7 via the voltage divider circuit formed by the twelfth resistor R12 and the fifteenth resistor R15.

[0117] Specifically, the second terminal of the twelfth resistor R12 is connected to the second terminal of the fifteenth resistor R15 and the base of the seventh switch Q7. The first terminal of the fifteenth resistor R15 is connected to the second terminal of the eighth resistor R8, the emitter of the seventh switch Q7, and the source of the power switch 20. After voltage division by the twelfth resistor R12 and the fifteenth resistor R15, the gate or base of the seventh switch Q7 receives a high-level signal, and the seventh switch Q7 is turned on.

[0118] As an example, and not a limitation, when the sixth switch Q6 is turned on, a low-resistance path is formed between its collector and emitter. The collector of the sixth switch Q6 is connected to the base of the second switch Q2 and the base of the fourth switch Q4. When the sixth switch Q6 is turned on, the bases of the second switch Q2 and the fourth switch Q4 are pulled low.

[0119] Specifically, the gate or base of the fourth switch Q4 is at a low level. Since Q4 is a PNP transistor, it conducts when its base is low, therefore Q4 is turned on. The gate or base of the second switch Q2 is also at a low level, so Q2 is not turned on.

[0120] It is easy to understand that when the second switch Q2 is not turned on (i.e., the second switch Q2 is turned off), the base of the eighth switch Q8 will lose the high-level drive signal, the base of the eighth switch Q8 will be at a low level, and the eighth switch Q8 will not be turned on.

[0121] In some embodiments of this application, when the second switch Q2 is not turned on, the first charging circuit is disconnected, and the gate of the power switch 20 no longer receives charging current from the first electrolytic capacitor CE1. Simultaneously, the fourth switch Q4 and the sixth switch Q6 are turned on, preparing for the subsequent discharge circuit.

[0122] In some embodiments of this application, when the control signal is high, the seventh switch Q7 is turned on, the fourth switch Q4 is turned on, and the sixth switch Q6 is turned on, forming a discharge circuit for the second capacitor C2.

[0123] Specifically, the second capacitor C2 has already been charged in the previous stage (when the control signal is low), and its voltage is approximately VCC. The electrical energy stored in the second capacitor C2 is discharged through the seventh switch Q7, the eighth resistor R8, point A, the fourth resistor R4, and the fourth switch Q4.

[0124] In some embodiments of this application, during the discharge process, the voltage of the second capacitor C2 is divided by the fourth resistor R4 and the parasitic resistance Rce of the sixth switch Q6. Since the resistance of the fourth resistor R4 is much larger than the parasitic resistance Rce of the sixth switch Q6, a larger voltage drop is obtained across the fourth resistor R4 in the voltage divider circuit.

[0125] Specifically, since R4 is much larger than Rce(Q6), according to the voltage divider principle, the voltage drop across the fourth resistor R4 is much greater than the voltage drop across the parasitic resistance Rce of the sixth switch Q6. After the voltage divider, the voltage at point A is negative relative to the source of the power switch 20.

[0126] It's easy to understand that the negative voltage is generated as follows: the second capacitor C2 discharges through the discharge circuit, and the discharge current flows through the fourth resistor R4 and the parasitic resistance Rce of the sixth switch Q6. Since the fourth resistor R4 and the parasitic resistance Rce of the sixth switch Q6 are connected in series, they divide the voltage, and R4 >> Rce, so the voltage drop across the fourth resistor R4 is much greater than the voltage drop across Rce. The first terminal of the second capacitor C2 is connected to the vicinity of point A through the low-resistance path of Q6, and point A is connected to the gate through the high-resistance R4, causing the potential at point A to drop relative to the source, thus forming a negative voltage.

[0127] As an example and not a limitation, after voltage division, the voltage at point A is negative, that is, a negative voltage is formed at the left end (near the first end) of the second capacitor C2, and point A is negative. Point A is connected to the gate of the power switch 20 through the fourth resistor R4. Therefore, this negative voltage is applied to the gate of the power switch 20, making the gate-source voltage Vgs of the power switch 20 negative, so as to quickly turn off the power switch 20.

[0128] In some embodiments of this application, a negative voltage is continuously applied to the gate of the power switch 20, causing the gate-source voltage Vgs of the power switch 20 to be much lower than the threshold voltage Vth, and the power switch 20 is in a deep cutoff state. In the deep cutoff state, even if there is a drastic voltage change (high dv / dt) at the midpoint of the bridge arm (the source of the power switch 20) and interference voltage is generated by coupling to the gate through the Miller capacitance, since the gate has been pulled to a deep cutoff region much lower than the threshold voltage by the negative voltage, the total gate-source voltage after the interference voltage is superimposed is still much lower than the threshold voltage Vth, and the power switch 20 will not be falsely triggered to conduct.

[0129] In some embodiments of this application, during the period when the control signal is high, the power module 150 provides supplementary charging to the first energy storage module 120. Specifically, the supply voltage VCC charges the first electrolytic capacitor CE1 through the first diode D1 and the first resistor R1.

[0130] Specifically, the charging current flows from the supply voltage VCC through the unidirectional conduction of the first diode D1, and then through the current-limiting effect of the first resistor R1, into the positive terminal of the first electrolytic capacitor CE1. The first resistor R1 limits the magnitude of the charging current to prevent excessive charging current from impacting the first electrolytic capacitor CE1. The charging current charges the first electrolytic capacitor CE1, replenishing the energy consumed by the first electrolytic capacitor CE1 when the control signal is at a low level.

[0131] In some embodiments of this application, while the control signal PWM remains high, the power switch 20 remains in a deeply off state, and a negative voltage is continuously applied to the gate of the power switch 20. The second capacitor C2 continuously discharges through the discharge circuit to maintain the generation of the negative voltage. The first electrolytic capacitor CE1 is continuously charged through the power module 150 to replenish energy and prepare for the power switch to turn on in the next control cycle.

[0132] It is easy to understand that when the control signal PWM changes from high to low again, the drive control circuit 10 re-enters the working process when the control signal is low, and begins a new control cycle. Through the periodic high and low level changes of the control signal, the drive control circuit 10 realizes the periodic on and off control of the power switch 20. At the same time, through the dual energy storage mechanism and the negative voltage fast turn-off mechanism, reliable switching and high anti-interference capability of the power switch 20 are ensured.

[0133] Based on the drive control circuit provided in the above embodiments, this utility model also provides an energy storage power supply, which includes the drive control circuit provided in any of the above embodiments.

[0134] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A drive control circuit, characterized in that, include: Second energy storage module; A push-pull drive module, connected to the second energy storage module and the power switch, is used to receive control signals, output a first drive signal when the control signal is low, and output a second drive signal when the control signal is high. The first energy storage module is connected to the push-pull drive module and is used to output a charging voltage through the first charging circuit formed by the push-pull drive module under the action of the first drive signal, so as to turn on the power switch tube. A negative pressure control module is connected to the first energy storage module, the second energy storage module, the push-pull drive module, and the power switch tube. It is used to form a second charging circuit with the first energy storage module in response to the charging voltage, and to charge the second energy storage module. And in response to the second drive signal, a discharge circuit for the second energy storage module is formed with the push-pull drive module to generate a negative voltage in the second energy storage module; The push-pull drive module is also used to generate a negative voltage drive signal in response to the negative voltage to turn off the power switch; the source of the power switch is in a floating state.

2. The circuit according to claim 1, characterized in that, The negative pressure control module includes a first switching unit and a second switching unit; The first switching unit is connected to the push-pull drive module, the first energy storage module, the second energy storage module, and the power switch, and is used to form a second charging circuit with the first energy storage module in response to the charging voltage being turned on, so as to charge the second energy storage module. The second switching unit is connected to the push-pull drive module, the first energy storage module, the second energy storage module, and the power switch, and is used to form the discharge circuit with the push-pull drive module in response to the second drive signal being turned on, so that the second energy storage module generates the negative voltage.

3. The circuit according to claim 2, characterized in that, The first switching unit includes a second diode, an eighth switching transistor, a thirteenth resistor, and a fourteenth resistor; The first end of the thirteenth resistor is connected to the push-pull drive module, the second end of the thirteenth resistor is connected to the first end of the fourteenth resistor and the base of the eighth switch, the collector of the eighth switch is connected to the cathode of the second diode, the anode of the second diode is connected to the push-pull drive module and the second energy storage module, and the emitter of the eighth switch is connected to the second end of the fourteenth resistor, the first energy storage module and the source of the power switch.

4. The circuit according to claim 2, characterized in that, The second switching unit includes a seventh switching transistor, a third resistor, an eighth resistor, a twelfth resistor, and a fifteenth resistor; The first end of the twelfth resistor is connected to the push-pull drive module. The second end of the twelfth resistor is connected to the second end of the fifteenth resistor and the base of the seventh switch. The first end of the fifteenth resistor is connected to the second end of the eighth resistor, the emitter of the seventh switch, the first energy storage module, and the source of the power switch. The collector of the seventh switch is connected to the second end of the third resistor. The first end of the third resistor is connected to the first energy storage module and is also connected to the power supply voltage.

5. The circuit according to claim 1, characterized in that, The push-pull drive module includes a second resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first switch, a second switch, a fourth switch, a fifth switch, and a sixth switch. The first end of the sixth resistor is connected to the control signal, the second end of the sixth resistor is connected to the first end of the ninth resistor and the base of the fifth switching transistor, the collector of the fifth switching transistor is connected to the base of the first switching transistor, the emitter of the fifth switching transistor is connected to the first end of the tenth resistor, and the second ends of the ninth resistor and the tenth resistor are connected to reference ground. The emitter of the first switching transistor is connected to the power supply voltage, the collector of the first switching transistor is connected to the first end of the fifth resistor and the negative voltage control module, the second end of the fifth resistor is connected to the base of the sixth switching transistor and the first end of the eleventh resistor, and the collector of the sixth switching transistor is connected to the second end of the second resistor, the base of the second switching transistor, the base of the fourth switching transistor and the first end of the seventh resistor. The emitter of the sixth switch is connected to the second terminal of the eleventh resistor, the second terminal of the seventh resistor, the collector of the fourth switch, the second energy storage module, and the negative voltage control module. The collector of the second switch is connected to the power supply voltage. The emitter of the second switch is connected to the emitter of the fourth switch, the first terminal of the fourth resistor, and the negative voltage control module. The second terminal of the fourth resistor is connected to the gate of the power switch.

6. The circuit according to claim 1, characterized in that, Also includes: The power supply module is connected to the push-pull drive module, the negative pressure control module, and the first energy storage module, and is used to provide power supply voltage to the push-pull drive module, the negative pressure control module, and the first energy storage module.

7. The circuit according to claim 6, characterized in that, The power module includes a first diode and a first resistor. The anode of the first diode is connected to the input voltage, the cathode of the first diode is connected to the first end of the first resistor, and the second end of the first resistor is connected to the push-pull drive module, the negative voltage control module, and the first energy storage module.

8. The circuit according to claim 1, characterized in that, The first energy storage module includes a first electrolytic capacitor. The first end of the first electrolytic capacitor is connected to the negative voltage control module and the push-pull drive module. The first end of the first electrolytic capacitor is also connected to the power supply voltage. The second end of the first electrolytic capacitor is connected to the negative voltage control module.

9. The circuit according to any one of claims 1-8, characterized in that, The second energy storage module includes a second capacitor and a third diode; The first terminal of the second capacitor is connected to the anode of the third diode, the push-pull drive module, and the negative voltage control module, and the second terminal of the second capacitor is connected to the cathode of the third diode and the negative voltage control module.

10. An energy storage power source, characterized in that, include: The drive control circuit as described in any one of claims 1-9.

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