Driving power supply circuit, three-level direct-current converter, chip and electronic equipment

Abstract

The invention provides a driving power supply circuit, a three-level direct current converter, a chip and electronic equipment. When the three-level DC converter is in a three-level buck mode, a charge pump mode or a boost mode and is in a working state, the power supply circuit obtains a power supply voltage according to the first voltage and the voltage of the control end of the first power tube, and transmits the power supply voltage to the charge pump circuit, the control circuit and the first voltage regulation circuit. Thus, the charge pump circuit obtains the second voltage according to the voltage of the first end of the first power tube and the output voltage, and the voltage on the bootstrap capacitor is used as the power supply voltage of the first driver. The first voltage adjusting circuit adjusts the voltage on the bootstrap capacitor to obtain the adjusted voltage on the bootstrap capacitor, and the adjusted voltage on the bootstrap capacitor is used as the power supply voltage of the second driver. The number of the bootstrap capacitor is one, so that the cost of driving the power supply circuit can be reduced, and the number of pins occupying a chip is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power management chips, and in particular to a driving power supply circuit, a three-level DC converter, a chip and an electronic device. Background Art

[0002] The three-level DC converter is widely used in the fields of new energy generation, electric vehicle charging piles, industrial power supplies and current transmission due to its good conversion efficiency, harmonic characteristics and electromagnetic interference resistance. The three-level DC converter includes: a drive power supply circuit, a power tube and a driver. At present, the driver is often powered by the drive power supply circuit so that the driver can drive the power tube. However, the drive power supply circuit in the related art has a high cost, and the drive power supply circuit occupies too many pins of the three-level DC converter chip, resulting in a high cost of the three-level DC converter. Summary of the invention

[0003] The present application provides a driving power supply circuit, a three-level DC converter, a chip and an electronic device, which can reduce the cost and the number of pins of the three-level DC converter chip occupied by the driving power supply circuit, thereby reducing the cost of the three-level DC converter.

[0004] In a first aspect, the present application provides a driving power supply circuit, which is applied to a three-level DC converter, wherein the three-level DC converter includes: a first power tube, a control circuit, a first driver and at least one second driver; the driving power supply circuit includes: a power supply circuit, a charge pump circuit and at least one first voltage adjustment circuit.

[0005] The first input end of the power supply circuit is electrically connected to the control end of the first power tube, the second input end of the power supply circuit is used to access the first voltage, the first output end of the power supply circuit is electrically connected to the power supply end of the charge pump circuit, the power supply end of the control circuit and the power supply end of the first voltage adjustment circuit respectively, the first input end of the charge pump circuit is electrically connected to the first end of the first power tube, the second input end of the charge pump circuit is used to access the output voltage of the three-level DC converter, the output end of the charge pump circuit is electrically connected to the power supply end of the first driver and the input end of the first voltage adjustment circuit respectively, the output end of the first voltage adjustment circuit is electrically connected to the power supply end of the second driver, the ground end of the first voltage adjustment circuit is electrically connected to the ground end of the second driver, the second output end of the power supply circuit is electrically connected between the output end of the charge pump circuit and the power supply end of the first driver, and the ground end of the power supply circuit and the ground end of the charge pump circuit are both electrically connected to the ground end of the first driver.

[0006] When the three-level DC converter is in a forward three-level buck mode, a forward charge pump mode, or a reverse boost mode, and is in a working state, the forward three-level buck mode means that the input voltage of the three-level DC converter is less than the output voltage, the forward charge pump mode means that the input voltage is equal to twice the output voltage, and the reverse boost mode means that the output end of the three-level DC converter supplies reverse power to the input end, so that the input voltage is greater than the output voltage, wherein:

[0007] The power supply circuit is used to obtain a power supply voltage based on the first voltage and the voltage of the control end of the first power tube, and transmit the power supply voltage to the charge pump circuit, the control circuit and the first voltage adjustment circuit respectively, so that the charge pump circuit, the control circuit and the first voltage adjustment circuit can work.

[0008] The charge pump circuit is used to obtain a second voltage according to the voltage of the first end of the first power tube and the output voltage under the action of the power supply voltage. The second voltage is used to charge the bootstrap capacitor in the charge pump circuit so that the voltage on the bootstrap capacitor is used as the power supply voltage of the first driver, so that the power tube corresponding to the first driver is turned on. The number of the bootstrap capacitor is one.

[0009] The first voltage adjustment circuit is used to adjust the voltage on the bootstrap capacitor under the action of the power supply voltage to obtain the adjusted voltage on the bootstrap capacitor, and the adjusted voltage on the bootstrap capacitor is used as the power supply voltage of the second driver to turn on the power tube corresponding to the second driver.

[0010] By means of the driving power supply circuit provided in the first aspect, when the three-level DC converter is in a forward three-level buck mode, a forward charge pump mode, or a reverse boost mode, and is in a working state, the power supply circuit can obtain the power supply voltage according to the first voltage and the voltage of the control end of the first power tube, and transmit the power supply voltage to the charge pump circuit, the control circuit, and the first voltage adjustment circuit respectively, so that the charge pump circuit, the control circuit, and the first voltage adjustment circuit can work. Under the action of the power supply voltage, the charge pump circuit can obtain the second voltage for charging the bootstrap capacitor in the charge pump circuit according to the voltage of the first end of the first power tube and the output voltage, so that the voltage on the bootstrap capacitor can be used as the power supply voltage of the first driver, so that the power tube corresponding to the first driver is turned on. Under the action of the power supply voltage, the first voltage adjustment circuit can adjust the voltage on the bootstrap capacitor to obtain the adjusted voltage on the bootstrap capacitor, so that the adjusted voltage on the bootstrap capacitor can be used as the power supply voltage of the second driver, so that the power tube corresponding to the second driver is turned on. Since the number of the bootstrap capacitor is one, the cost of the driving power supply circuit can be reduced, and the number of pins occupied by the driving power supply circuit of the three-level DC converter chip can be reduced. Therefore, the cost of the three-level DC converter can be reduced.

[0011] In a possible design, when the three-level DC converter is in a pass-through mode and in a working state, the pass-through mode means that the input voltage is equal to the output voltage, wherein:

[0012] The power supply circuit is used to obtain a power supply voltage according to the first voltage and the voltage of the control end of the first power tube, and transmit the power supply voltage to the control circuit so that the control circuit can work.

[0013] The power supply circuit is also used to adjust the power supply voltage to obtain an adjusted power supply voltage, and the adjusted power supply voltage is used as the power supply voltage of the first driver and the second driver to turn on the power tube corresponding to the first driver and the power tube corresponding to the second driver.

[0014] In one possible design, the drive power supply circuit also includes: a starting circuit.

[0015] A first end of the startup circuit is electrically connected to a first end of the charge pump circuit, a second end of the startup circuit is electrically connected to the bootstrap capacitor, and a second end of the charge pump circuit is grounded.

[0016] The startup circuit is used to obtain the second voltage from the charge pump circuit when the drive power supply circuit is started, and use the second voltage to charge the bootstrap capacitor to start the drive power supply circuit.

[0017] The power supply circuit is further used to charge the output end of the charge pump circuit using the adjusted power supply voltage to start the driving power supply circuit.

[0018] Based on this, when the driving power supply circuit is started, the starting circuit can obtain the second voltage from the charge pump circuit, and use the second voltage to charge the bootstrap capacitor, so that the voltage on the bootstrap capacitor can reach the second voltage. The power supply circuit can use the adjusted power supply voltage to charge the output end of the charge pump circuit. Thus, the driving power supply circuit can be started.

[0019] In one possible design, the charge pump circuit includes: a power selection circuit, a second voltage adjustment circuit and a first charge pump.

[0020] The first input end of the power selection circuit is electrically connected to the first end of the first power tube, the second input end of the power selection circuit is used to access the output voltage, the output end of the power selection circuit is electrically connected to the input end of the second voltage adjustment circuit, the power end of the second voltage adjustment circuit is electrically connected to the first output end of the power circuit, the output end of the second voltage adjustment circuit is electrically connected to the input end of the first charge pump, the output end of the first charge pump is electrically connected to the power end of the first driver, the first end of the first charge pump is electrically connected to the ground end of the first driver, and the second end of the first charge pump and the ground end of the second voltage adjustment circuit are both grounded.

[0021] The power selection circuit is used to select a first target voltage between the voltage of the first end of the first power tube and the output voltage, and transmit the first target voltage to the second voltage adjustment circuit.

[0022] The second voltage adjustment circuit is used to adjust the first target voltage under the action of the power supply voltage to obtain the second voltage, and transmit the second voltage to the first charge pump.

[0023] The first charge pump is used to charge the bootstrap capacitor using the second voltage.

[0024] Based on this, the power selection circuit can select a first target voltage between the voltage at the first end of the first power tube and the output voltage, and transmit the first target voltage to the second voltage adjustment circuit, so that the second voltage adjustment circuit can obtain the first target voltage. In this way, under the action of the power supply voltage, the second voltage adjustment circuit can adjust the first target voltage to obtain the second voltage, and transmit the second voltage to the first charge pump, so that the first charge pump can obtain the second voltage. Thus, the first charge pump can use the second voltage to charge the bootstrap capacitor, so that the voltage on the bootstrap capacitor can be used as the power supply voltage of the first driver.

[0025] In one possible design, the first charge pump includes: a first N-type power tube, a second N-type power tube, a third N-type power tube, a fourth N-type power tube, a bootstrap capacitor, a first capacitor, a third driver, a fourth driver, a fifth driver and a sixth driver.

[0026] The input end of the third driver and the input end of the fifth driver are both used to receive a first drive signal, the input end of the fourth driver and the input end of the sixth driver are both used to receive a second drive signal, the first drive signal and the second drive signal are both used to drive the N-type power tube to be turned on or off, and the level of the first drive signal is opposite to the level of the second drive signal, the output end of the third driver is electrically connected to the control end of the first N-type power tube, the output end of the fourth driver is electrically connected to the control end of the second N-type power tube, the second end of the first N-type power tube is electrically connected to the output end of the second voltage adjustment circuit, the first end of the first N-type power tube is electrically connected to the second end of the second N-type power tube, and the first end of the second N-type power tube is electrically connected to the power supply end of the first driver.

[0027] The output end of the fifth driver is electrically connected to the control end of the third N-type power tube, the output end of the sixth driver is electrically connected to the control end of the fourth N-type power tube, the second end of the third N-type power tube is grounded, the first end of the third N-type power tube is electrically connected to the second end of the fourth N-type power tube, the first end of the fourth N-type power tube is electrically connected to the ground end of the first driver, the upper plate of the bootstrap capacitor is electrically connected between the first end of the first N-type power tube and the second end of the second N-type power tube, the lower plate of the bootstrap capacitor is electrically connected between the first end of the third N-type power tube and the second end of the fourth N-type power tube, the upper plate of the first capacitor is electrically connected between the first end of the second N-type power tube and the power supply end of the first driver, and the lower plate of the first capacitor is electrically connected between the first end of the fourth N-type power tube and the ground end of the first driver.

[0028] Based on this, the third driver and the fifth driver can drive the first N-type power tube and the third N-type power tube to be turned on or off according to the first driving signal, and the fourth driver and the sixth driver can drive the second N-type power tube and the fourth N-type power tube to be turned on or off according to the second driving signal, so that the bootstrap capacitor is charged or discharged. Therefore, the voltage on the bootstrap capacitor CDRV can be used as the power supply voltage of the first driver.

[0029] In one possible design, the power supply selection circuit is specifically used to select the output voltage as the first target voltage if the output voltage is greater than a preset voltage when the three-level DC converter is in the forward three-level buck mode, the forward charge pump mode, or the pass-through mode; and to select the voltage of the first end of the first power tube as the first target voltage if the output voltage is less than a preset voltage.

[0030] or,

[0031] The power selection circuit is specifically used to select the output voltage as the first target voltage if the three-level DC converter is in the reverse boost mode and to select the voltage of the first end of the first power tube as the first target voltage if the three-level DC converter is in the startup state when the three-level DC converter is in the reverse boost mode; and to select the voltage of the first end of the first power tube as the first target voltage if the three-level DC converter is in the working state.

[0032] In a possible design, the first voltage adjustment circuit or the second voltage adjustment circuit includes: a first current source, a first N-type MOS transistor and a first diode.

[0033] The input end of the first current source is electrically connected to the first output end of the power supply circuit, the output end of the first current source is electrically connected to the control end of the first N-type MOS transistor, the first end of the first N-type MOS transistor is electrically connected to the output end of the charge pump circuit, or the output end of the power supply selection circuit, the cathode of the first diode is electrically connected between the output end of the first current source and the control end of the first N-type MOS transistor, the second end of the first N-type MOS transistor is electrically connected to the power supply end of the second driver, or the input end of the first charge pump, and the anode of the first diode is electrically connected to the ground end of the second driver, or the anode of the first diode is grounded.

[0034] In one possible design, the power supply circuit includes: a first high selection circuit, a third voltage adjustment circuit, a second charge pump, a third charge pump and a switch tube.

[0035] The input end of the second charge pump is electrically connected to the second end of the first power tube, the output end of the second charge pump is electrically connected to the first end of the switch tube, the second end of the switch tube is electrically connected to the control end of the first power tube, the control end of the switch tube is used to access a control signal, and the control signal is used to control the conduction or shutdown of the switch tube. The input end of the third charge pump is used to access the first voltage, the output end of the third charge pump is electrically connected to the first input end of the first high selection circuit, the second input end of the first high selection circuit is electrically connected between the second end of the switch tube and the control end of the first power tube, the output end of the first high selection circuit is electrically connected to the power supply end of the charge pump circuit, the input end of the third voltage adjustment circuit, the power supply end of the third voltage adjustment circuit and the power supply end of the first voltage adjustment circuit respectively, the output end of the third voltage adjustment circuit is electrically connected between the output end of the charge pump circuit and the power supply end of the first driver, and the ground end of the third voltage adjustment circuit is electrically connected to the ground end of the first driver.

[0036] The second charge pump is used to obtain the input voltage from the first power tube and boost the input voltage to obtain a third voltage.

[0037] The switch tube is used to determine whether to connect the output end of the second charge pump and the control end of the first power tube according to the control signal, so that the third voltage is used as the voltage of the control end of the first power tube.

[0038] The third charge pump is used to boost the first voltage to obtain a boosted first voltage, and transmit the boosted first voltage to the first high voltage selection circuit.

[0039] The first high selection circuit is used to obtain the voltage of the control end of the first power tube from the first power tube.

[0040] The first high selection circuit is also used to select a maximum voltage from the boosted first voltage and the voltage at the control end of the first power tube as the power supply voltage, and transmit the power supply voltage to the third voltage adjustment circuit.

[0041] The third voltage adjustment circuit is used to adjust the power supply voltage to obtain the adjusted power supply voltage.

[0042] Based on this, the second charge pump can obtain an input voltage from the first power tube, and boost the input voltage to obtain a third voltage. The switch tube can determine whether to connect the output end of the second charge pump and the control end of the first power tube according to the control signal, so that the third voltage is used as the voltage of the control end of the first power tube. The third charge pump can boost the first voltage to obtain the boosted first voltage, and transmit the boosted first voltage to the first high selection circuit, so that the first high selection circuit can obtain the boosted first voltage. The first high selection circuit can obtain the voltage of the control end of the first power tube from the first power tube. In addition, the first high selection circuit can select the maximum voltage from the boosted first voltage and the voltage of the control end of the first power tube as the power supply voltage. Thus, the power supply circuit can obtain the power supply voltage. At the same time, the first high selection circuit can transmit the power supply voltage to the third voltage adjustment circuit, so that the third voltage adjustment circuit can obtain the power supply voltage. In this way, the third voltage adjustment circuit can adjust the power supply voltage to obtain the adjusted power supply voltage. Thus, the source circuit can obtain the adjusted power supply voltage.

[0043] In one possible design, the first high selection circuit includes: a second diode and a third diode.

[0044] The anode of the second diode is electrically connected between the second end of the switch tube and the control end of the first power tube, the cathode of the second diode is electrically connected to the cathode of the third diode, the anode of the third diode is electrically connected to the output end of the third charge pump, and the power supply end of the charge pump circuit is electrically connected between the cathode of the second diode and the cathode of the third diode.

[0045] In one possible design, the third voltage adjustment circuit includes: a second current source, a third current source, a second N-type MOS transistor and a fourth diode.

[0046] The input end of the second current source and the input end of the third current source are both electrically connected to the output end of the first high selection circuit, the output end of the second current source is electrically connected to the first end of the second N-type MOS tube, the control end of the second N-type MOS tube is electrically connected to the output end of the third current source, the second end of the second N-type MOS tube is electrically connected between the output end of the charge pump circuit and the power supply end of the first driver, the cathode of the fourth diode is electrically connected between the control end of the second N-type MOS tube and the output end of the third current source, and the anode of the fourth diode is electrically connected to the ground end of the first driver.

[0047] In a possible design, the driving power supply circuit also includes: a second high selection circuit, a third high selection circuit and a linear voltage stabilization circuit.

[0048] The input end of the linear voltage stabilizing circuit is electrically connected to the second end of the first power tube, the output end of the linear voltage stabilizing circuit is electrically connected to the first input end of the second high selection circuit, the second input end of the second high selection circuit is used to access the battery voltage, the output end of the second high selection circuit is respectively electrically connected to the first input end of the third high selection circuit and the power supply end of the second charge pump, the second input end of the third high selection circuit is electrically connected to the first end of the charge pump circuit, and the output end of the third high selection circuit is electrically connected to the input end of the third charge pump.

[0049] The linear voltage stabilizing circuit is used to obtain the input voltage from the first power tube, step down the input voltage to obtain a fourth voltage, and transmit the fourth voltage to the second high voltage selection circuit.

[0050] The third high selection circuit is used to obtain the second voltage from the charge pump circuit, and select a maximum voltage from the second voltage and the second target voltage as the first voltage.

[0051] Based on this, the linear voltage regulator circuit can obtain an input voltage from the first power tube, and step down the input voltage to obtain a fourth voltage, and transmit the fourth voltage to the second high selection circuit, so that the second high selection circuit can obtain the fourth voltage. The third high selection circuit can obtain the second voltage from the charge pump circuit, and select the maximum voltage from the second voltage and the second target voltage as the first voltage. Thus, the third high selection circuit can output the first voltage, so that the third charge pump can obtain the first voltage.

[0052] In a second aspect, the present application provides a three-level DC converter, comprising: a first power tube, a second power tube, a third power tube, a fourth power tube, a fifth power tube, a sixth power tube, a first power tube group, a second power tube group, a control circuit, a first driver, a first sub-driver, a second sub-driver, a third sub-driver, a fourth sub-driver, a fifth sub-driver, a flying capacitor, a freewheeling inductor, and a drive power supply circuit in the above-mentioned first aspect and any possible design of the first aspect.

[0053] The second end of the first power tube is used to access the input voltage of the three-level DC converter, the control end of the first power tube is electrically connected to the second end of the switch tube, the first end of the first power tube is electrically connected to the first end of the second power tube, the control end of the second power tube is electrically connected to the output end of the first driver, the power supply end of the first driver is electrically connected to the output end of the charge pump circuit, the second end of the second power tube is electrically connected to the first end of the third power tube, the control end of the third power tube is electrically connected to the output end of the first sub-driver, the second end of the third power tube is electrically connected to the first end of the fourth power tube, the control end of the fourth power tube is electrically connected to the output end of the second sub-driver, the second end of the fourth power tube is electrically connected to the first end of the fifth power tube, and the control end of the fifth power tube is electrically connected to the output end of the third sub-driver.

[0054] The upper plate of the flying capacitor and the ground end of the first driver are both electrically connected between the second end of the second power tube and the first end of the third power tube, the lower plate of the flying capacitor and the ground end of the second sub-driver are both electrically connected between the second end of the fourth power tube and the first end of the fifth power tube, the first end of the first power tube group, the first end of the second power tube group, the ground end of the first sub-driver and the first end of the freewheeling inductor are all electrically connected between the second end of the third power tube and the first end of the fourth power tube.

[0055] The control end of the first power tube group is electrically connected to the output end of the fourth sub-driver, the ground end of the fourth sub-driver is electrically connected to the second end of the first power tube group, the control end of the second power tube group is electrically connected to the output end of the fifth sub-driver, the ground end of the fifth sub-driver is electrically connected to the second end of the second power tube group, the third end of the second power tube group and the first end of the sixth power tube are both used to access the battery voltage, the control end of the sixth power tube is electrically connected to the output end of the control circuit, the second end of the sixth power tube is electrically connected to the second end of the freewheeling inductor, and the second end of the freewheeling inductor is also used to output the output voltage of the three-level DC converter, and the third end of the first power tube group and the second end of the fifth power tube are both grounded.

[0056] The three-level DC converter includes at least one second driver, the second driver includes the first sub-driver, the second sub-driver, the third sub-driver, the fourth sub-driver and the fifth sub-driver, and the second drivers are electrically connected to the first voltage adjustment circuit one by one.

[0057] In one possible design, the three-level DC converter further includes: a second capacitor and a third capacitor;

[0058] The upper plate of the second capacitor is electrically connected between the first end of the first power tube and the first end of the second power tube, the upper plate of the third capacitor is electrically connected to the third end of the first power tube group, and the lower plate of the second capacitor and the lower plate of the third capacitor are both grounded.

[0059] The beneficial effects of the three-level DC converter provided in the second aspect and each possible design of the second aspect can be referred to the beneficial effects brought about by the first aspect and each possible implementation manner of the first aspect, which will not be repeated here.

[0060] In a third aspect, the present application provides a chip, comprising: the driving power supply circuit in the above-mentioned first aspect and any possible design of the first aspect, or the three-level DC converter in the above-mentioned second aspect.

[0061] In a fourth aspect, the present application provides an electronic device, comprising: the chip in the third aspect above.

[0062] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0064] Figure 1 is a structural schematic diagram of a three-level DC converter in the related art;

[0065] Figure 2 A schematic diagram of the structure of a three-level DC converter provided in one embodiment of the present application;

[0066] Figure 3 A working timing diagram of a three-level DC converter provided in an embodiment of the present application when the duty cycle is less than 50%;

[0067] Figure 4 A working timing diagram of a three-level DC converter provided in one embodiment of the present application when the duty cycle is greater than 50%;

[0068] Figure 5Another working timing diagram of a three-level DC converter provided in one embodiment of the present application;

[0069] Figure 6 Another working timing diagram of a three-level DC converter provided in one embodiment of the present application;

[0070] Figure 7 A schematic diagram of the structure of a voltage adjustment circuit in a three-level DC converter provided in one embodiment of the present application. DETAILED DESCRIPTION

[0071] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0072] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0073] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0074] Reference Figure 1 , Figure 1FIG. 1 is a schematic diagram of a structure of a three-level DC converter in the related art. Figure 1 As shown, the driving power supply circuit in the related art may include: three bootstrap capacitors and three diodes. The driving power supply circuit supplies power to the drivers corresponding to the power tubes K1 to K4 respectively in a step-by-step boosting manner through the three bootstrap capacitors, so that the drivers can drive the power tubes K1 to K4.

[0075] Among them, when the three-level DC converter in the related art is in the reverse boost mode, the power tubes K1 and K4 are always in the on state, i.e., the direct-on state, and the power tubes K2 and K3 are in the periodic on or off state, i.e., the switching state.

[0076] However, since the driving power supply circuit in the related art requires three bootstrap capacitors, the driving power supply circuit has a high cost, and the driving power supply circuit occupies too many pins of the three-level DC converter chip, resulting in a high cost of the three-level DC converter.

[0077] In order to solve the above problems, the present application provides a driving power supply circuit, a three-level DC converter, a chip and an electronic device.

[0078] The driving power supply circuit 1000 and the three-level DC converter 10000 may be chips or circuit modules.

[0079] In the present application, electronic equipment may include, but is not limited to: electric vehicle drive systems, communication equipment, new energy vehicles, and electric vehicle drive systems.

[0080] Reference Figure 2 , Figure 2 Schematic diagram of a three-level DC converter provided in one embodiment of the present application. Figure 2 As shown, the three-level DC converter 10000 may include: a first power tube QB, a second power tube Q1, a third power tube Q2, a fourth power tube Q3, a fifth power tube Q4, a sixth power tube QBAT, a first power tube group 2000, a second power tube group 3000, a control circuit 4000, a first driver DRV1, a first sub-driver DRV2-1, a second sub-driver DRV2-2, a third sub-driver DRV2-3, a fourth sub-driver DRV2-4, a fifth sub-driver DRV2-5, a flying capacitor CFLY, a freewheeling inductor L and a drive power supply circuit 1000.

[0081] The second end of the first power tube QB is used to access the input voltage VBUS of the three-level DC converter 10000, the control end of the first power tube QB is electrically connected to the second end of the switch tube H, the first end of the first power tube QB is electrically connected to the first end of the second power tube Q1, the control end of the second power tube Q1 is electrically connected to the output end of the first driver DRV1, the power supply end of the first driver DRV1 is electrically connected to the output end CPO of the charge pump circuit 200, the second end of the second power tube Q1 is electrically connected to the first end of the third power tube Q2, the control end of the third power tube Q2 is electrically connected to the output end of the first sub-driver DRV2-1, the second end of the third power tube Q2 is electrically connected to the first end of the fourth power tube Q3, the control end of the fourth power tube Q3 is electrically connected to the output end of the second sub-driver DRV2-2, the second end of the fourth power tube Q3 is electrically connected to the first end of the fifth power tube Q4, and the control end of the fifth power tube Q4 is electrically connected to the output end of the third sub-driver DRV2-3.

[0082] The upper plate of the flying capacitor CFLY and the ground end of the first driver DRV1 are both electrically connected between the second end of the second power tube Q1 and the first end of the third power tube Q2, the lower plate of the flying capacitor CFLY and the ground end of the second sub-driver DRV2-2 are both electrically connected between the second end of the fourth power tube Q3 and the first end of the fifth power tube Q4, the first end of the first power tube group 2000, the first end of the second power tube group 3000, the ground end of the first sub-driver DRV2-1 and the first end of the freewheeling inductor L are all electrically connected between the second end of the third power tube Q2 and the first end of the fourth power tube Q3.

[0083] The control end of the first power tube group 2000 is electrically connected to the output end of the fourth sub-driver DRV2-4, the ground end of the fourth sub-driver DRV2-4 is electrically connected to the second end of the first power tube group 2000, the control end of the second power tube group 3000 is electrically connected to the output end of the fifth sub-driver DRV2-5, the ground end of the fifth sub-driver DRV2-5 is electrically connected to the second end of the second power tube group 3000, the third end of the second power tube group 3000 and the first end of the sixth power tube QBAT are both used to access the battery voltage VBAT, the control end of the sixth power tube QBAT is electrically connected to the output end of the control circuit 4000, the second end of the sixth power tube QBAT is electrically connected to the second end of the freewheeling inductor L, the second end of the freewheeling inductor L is also used to output the output voltage VSYS of the three-level DC converter 10000, and the third end of the first power tube group 2000 and the second end of the fifth power tube Q4 are both grounded.

[0084] The three-level DC converter 10000 includes at least one second driver DRV2, which includes a first sub-driver DRV2-1, a second sub-driver DRV2-2, a third sub-driver DRV2-3, a fourth sub-driver DRV2-4 and a fifth sub-driver DRV2-5. The second driver DRV2 is electrically connected to the first voltage adjustment circuit 300 one by one.

[0085] The first power tube QB, the second power tube Q1, the third power tube Q2, the fourth power tube Q3, the fifth power tube Q4 and the sixth power tube QBAT may include but are not limited to gallium nitride transistors, metal-oxide semiconductor field effect transistors and field-controlled thyristors.

[0086] For example, when the first power tube QB, the second power tube Q1, the third power tube Q2, the fourth power tube Q3, the fifth power tube Q4 and the sixth power tube QBAT are gallium nitride transistors, the control end of the first power tube QB, the control end of the second power tube Q1, the control end of the third power tube Q2, the control end of the fourth power tube Q3, the control end of the fifth power tube Q4 and the control end of the sixth power tube QBAT refer to the gate of the gallium nitride transistor, and the first end of the first power tube QB, the first end of the second power tube Q1, the first end of the third power tube Q2, the first end of the fourth power tube Q3, the first end of the fifth power tube Q4 and the first end of the sixth power tube QBAT may be the drain or source of the gallium nitride transistor, and correspondingly, the second end of the first power tube QB, the second end of the second power tube Q1, the second end of the third power tube Q2, the second end of the fourth power tube Q3, the second end of the fifth power tube Q4 and the second end of the sixth power tube QBAT may be the source or drain of the gallium nitride transistor.

[0087] For example, when the first power tube QB, the second power tube Q1, the third power tube Q2, the fourth power tube Q3, the fifth power tube Q4 and the sixth power tube QBAT are metal-oxide semiconductor field effect transistors, the control end of the first power tube QB, the control end of the second power tube Q1, the control end of the third power tube Q2, the control end of the fourth power tube Q3, the control end of the fifth power tube Q4 and the control end of the sixth power tube QBAT refer to the gate of the metal-oxide semiconductor field effect transistor, and the first end of the first power tube QB, the first end of the second power tube Q1, the first end of the third power tube Q2, the first end of the fourth power tube Q3, the first end of the fifth power tube Q4 and the first end of the sixth power tube QBAT may be the drain or source of the metal-oxide semiconductor field effect transistor, and correspondingly, the second end of the first power tube QB, the second end of the second power tube Q1, the second end of the third power tube Q2, the second end of the fourth power tube Q3, the second end of the fifth power tube Q4 and the second end of the sixth power tube QBAT may be the source or drain of the metal-oxide semiconductor field effect transistor.

[0088] For example, when the first power tube QB, the second power tube Q1, the third power tube Q2, the fourth power tube Q3, the fifth power tube Q4 and the sixth power tube QBAT are field-controlled thyristors, the control end of the first power tube QB, the control end of the second power tube Q1, the control end of the third power tube Q2, the control end of the fourth power tube Q3, the control end of the fifth power tube Q4 and the control end of the sixth power tube QBAT refer to the gate of the field-controlled thyristor, and the first end of the first power tube QB, the first end of the second power tube Q1, the first end of the third power tube Q2, the first end of the fourth power tube Q3, the first end of the fifth power tube Q4 and the first end of the sixth power tube QBAT may be the drain or source of the field-controlled thyristor, and correspondingly, the second end of the first power tube QB, the second end of the second power tube Q1, the second end of the third power tube Q2, the second end of the fourth power tube Q3, the second end of the fifth power tube Q4 and the second end of the sixth power tube QBAT may be the source or drain of the field-controlled thyristor.

[0089] The input end of the first driver DRV1 is used to obtain the driving signal Q1_ON, and the driving signal Q1_ON is used to drive the second power tube Q1 to be turned on or off. The input end of the first sub-driver DRV2-1 is used to obtain the driving signal Q2_ON, and the driving signal Q2_ON is used to drive the third power tube Q2 to be turned on or off. The input end of the second sub-driver DRV2-2 is used to obtain the driving signal Q3_ON, and the driving signal Q3_ON is used to drive the fourth power tube Q3 to be turned on or off. The input end of the third sub-driver DRV2-3 is used to obtain the driving signal Q4_ON, and the driving signal Q4_ON is used to drive the fifth power tube Q4 to be turned on or off. The input end of the fourth sub-driver DRV2-4 is used to obtain the driving signal QBL_ON, and the driving signal QBL_ON is used to drive the first power tube group 2000 to be turned on or off. The input end of the fifth sub-driver DRV2-5 is used to obtain the driving signal QBYP_ON, and the driving signal QBYP_ON is used to drive the second power tube group 3000 to be turned on or off.

[0090] In the present application, the three-level DC converter 10000 can operate in a forward three-level buck mode BUCK, a forward charge pump mode, a forward pass-through mode, and a reverse boost mode BOOST. Among them, the forward three-level buck mode BUCK means that the input voltage VBUS of the three-level DC converter 10000 is less than the output voltage VSYS. The forward charge pump mode means that the input voltage VBUS is equal to twice the output voltage VSYS, that is, the forward charge pump mode specifically refers to the 2:1 charge pump mode. The forward pass-through mode means that the input voltage VBUS is equal to the output voltage VSYS. The reverse boost mode BOOST means that the output end of the three-level DC converter 10000 supplies power to the input end in reverse so that the input voltage VBUS is greater than the output voltage VSYS.

[0091] The battery voltage VBAT is provided by a battery. When the three-level DC converter 10000 operates in the forward three-level buck mode BUCK, the forward charge pump mode, and the forward pass-through mode, the three-level DC converter 10000 can charge the battery. When the three-level DC converter 10000 operates in the reverse boost mode BOOST, the battery can discharge the three-level DC converter 10000.

[0092] When the three-level DC converter 10000 is in the forward three-level buck mode BUCK, the first power tube QB and the second power tube group 3000 remain in the off state. Figure 3 and Figure 4 , Figure 3 Shows Figure 2 The working timing diagram of the three-level DC converter when the duty cycle is less than 50%, Figure 4 Shows Figure 2 The working timing diagram of the three-level DC converter when the duty cycle is greater than 50%. Figure 3 and Figure 4 As shown, the drive signal Q1_ON and the drive signal Q4_ON are logically mutually exclusive, that is, when the drive signal Q1_ON is at a high level, the drive signal Q4_ON is at a low level; when the drive signal Q1_ON is at a low level, the drive signal Q4_ON is at a high level. The drive signal Q2_ON and the drive signal Q3_ON are logically mutually exclusive. The phase difference between the drive signal Q1_ON and the drive signal Q2_ON is 180 degrees. When the drive signal Q1_ON and the drive signal Q3_ON are at a high level at the same time, or when the drive signal Q2_ON and the drive signal Q4_ON are at a high level at the same time, the drive signal QBL_ON is at a high level. Among them, the high level is represented by 1 and the low level is represented by 0.

[0093] When the three-level DC converter 10000 is in working state, that is, when the pre-charging of the three-level DC converter 10000 is completed, the driving power supply circuit 100 can provide power supply voltage to the first driver DRV1 and the second driver DRV2 respectively, so that the first driver DRV1 can drive the second power tube Q1, and the second driver DRV2 can drive the corresponding power tube. Therefore, under the action of the driving power supply circuit 1000, the first driver DRV1 can drive the second power tube Q1 to turn on according to the driving signal Q1_ON, and the second driver DRV2 can drive the corresponding power tube to turn on according to the driving signal. Among them, the control circuit 4000 controls the charging current of the three-level DC converter 10000 to charge the battery by controlling the opening of the sixth power tube QBAT.

[0094] The power tubes corresponding to the second driver DRV2 may include: a third power tube Q2 , a fourth power tube Q3 , a fifth power tube Q4 , a sixth power tube QBAT, a first power tube group 2000 and a second power tube group 3000 .

[0095] When the three-level DC converter 10000 is in the reverse boost mode BOOST, the first power tube QB, the first power tube group 2000 and the second power tube group 3000 remain in the off state. The second power tube Q1 and the fifth power tube Q4 remain in the on state. Figure 5 , Figure 5 Shows Figure 2 The working timing diagram of the three-level DC converter in FIG. Figure 5 As shown, the driving signal Q2_ON and the driving signal Q3_ON are mutually exclusive, that is, when the driving signal Q2_ON is at a high level, the driving signal Q3_ON is at a low level; when the driving signal Q2_ON is at a low level, the driving signal Q3_ON is at a high level.

[0096] When the three-level DC converter 10000 is in operation, the driving power supply circuit 1000 can provide power supply voltages to the first sub-driver DRV2-1 and the second sub-driver DRV2-2, respectively, so that the first sub-driver DRV2-1 can drive the third power tube Q2, and the second sub-driver DRV2-2 can drive the fourth power tube Q3. Thus, under the action of the driving power supply circuit 1000, the first sub-driver DRV2-1 can drive the third power tube Q2 to turn on according to the driving signal Q2_ON, and the first sub-driver DRV2-1 can drive the fourth power tube Q3 to turn on according to the driving signal Q3_ON.

[0097] When the three-level DC converter 10000 is in the forward charge pump mode, the first power tube QB, the second power tube group 3000 and the sixth power tube QBAT remain in the on state, and the first power tube group 2000 remains in the off state. Figure 6 , Figure 6 Shows Figure 2 The working timing diagram of the three-level DC converter in FIG. Figure 6 As shown, the driving signal Q1_ON is logically identical to the driving signal Q3_ON, that is, when the driving signal Q1_ON is at a high level, the driving signal Q3_ON is at a high level; when the driving signal Q1_ON is at a low level, the driving signal Q3_ON is at a low level. The driving signal Q2_ON is logically identical to the driving signal Q4_ON. The driving signal Q1_ON and the driving signal Q2_ON are logically mutually exclusive, and the duty ratios of the driving signal Q1_ON and the driving signal Q2_ON are both 50%.

[0098] When the three-level DC converter 10000 is in operation, the driving power supply circuit 1000 can provide a power supply voltage to the first driver DRV1 and the second driver DRV2 respectively, so that the first driver DRV1 can drive the second power tube Q1, and the second driver DRV2 can drive the corresponding power tube. Thus, under the action of the driving power supply circuit 1000, the first driver DRV1 can drive the second power tube Q1 to turn on according to the driving signal Q1_ON, and the second driver DRV2 can drive the corresponding power tube to turn on according to the driving signal.

[0099] When the three-level DC converter 1000 is in the forward direct mode, the first power tube QB, the second power tube group 3000 and the sixth power tube QBAT remain turned on, and the first power tube group 2000, the fourth power tube Q3 and the fifth power tube Q4 remain turned off.

[0100] When the three-level DC converter 10000 is in operation, the driving power supply circuit 1000 can provide power supply voltages to the first driver DRV1 and the first sub-driver DRV2-1 respectively, the first driver DRV1 can drive the second power tube Q1, and the first sub-driver DRV2-1 can drive the third power tube Q2. Thus, under the action of the driving power supply circuit 1000, the first driver DRV1 can drive the second power tube Q1 to be always in the on state according to the driving signal Q1_ON, and the first sub-driver DRV2-1 can drive the third power tube Q2 to be always in the on state according to the driving signal Q2_ON.

[0101] In summary, when the three-level DC converter 10000 is in the forward three-level buck mode BUCK, or the forward charge pump mode, or the forward pass-through mode, or the reverse boost mode BOOST, and in the working state, the driving power supply circuit 1000 can provide the first driver DRV1 and the second driver DRV2 with a power supply voltage, so that the first driver DRV1 can drive the second power tube Q1, and the second driver DRV2 can drive the corresponding power tube. Since the number of the bootstrap capacitor CDRV in the driving power supply circuit 1000 is one, the cost of the driving power supply circuit 1000 is low, and the number of pins of the three-level DC converter chip occupied by the driving power supply circuit 1000 is reduced. Thus, the cost of the three-level DC converter 1000 can be reduced.

[0102] The working principle of the driving power supply circuit 1000 is described in detail below. The contents are as follows:

[0103] like Figure 2 As shown, the driving power supply circuit 1000 may include: a power supply circuit 100 , a charge pump circuit 200 and at least one first voltage adjustment circuit 300 .

[0104] The first input terminal of the power supply circuit 100 is electrically connected to the control terminal of the first power tube QB, the second input terminal of the power supply circuit 100 is used to access the first voltage V1, the first output terminal of the power supply circuit 100 is electrically connected to the power supply terminal of the charge pump circuit 200, the power supply terminal of the control circuit 4000 and the power supply terminal of the first voltage adjustment circuit 300 respectively, the first input terminal of the charge pump circuit 200 is electrically connected to the first terminal of the first power tube QB, the second input terminal of the charge pump circuit 200 is used to access the output voltage VSYS of the three-level DC converter 10000, and the output terminal of the charge pump circuit 200 is electrically connected to the power supply terminal of the charge pump circuit 200. CPO is electrically connected to the power supply terminal of the first driver DRV1 and the input terminal of the first voltage adjustment circuit 300 respectively, the output terminal of the first voltage adjustment circuit 300 is electrically connected to the power supply terminal of the second driver DRV2, the ground terminal of the first voltage adjustment circuit 300 is electrically connected to the ground terminal of the second driver DRV2, the second output terminal of the power supply circuit 100 is electrically connected between the output terminal CPO of the charge pump circuit 200 and the power supply terminal of the first driver DRV1, and the ground terminal of the power supply circuit 100 and the ground terminal of the charge pump circuit 200 are both electrically connected to the ground terminal of the first driver DRV1.

[0105] The power supply circuit 100 , the charge pump circuit 200 and the at least one first voltage adjustment circuit 300 may be arranged separately or integratedly.

[0106] The number of the first voltage adjustment circuits 300 corresponds to the number of the second drivers DRV2. For example, when the number of the second drivers DRV2 is 1, the number of the first voltage adjustment circuits 300 is 1. For another example, when the number of the second drivers DRV2 is 4, the number of the first voltage adjustment circuits 300 is 4.

[0107] When the three-level DC converter 10000 is in a forward three-level buck mode BUSK, or a forward charge pump mode, or a reverse boost mode BOOST, and is in a working state, wherein:

[0108] The power supply circuit 100 can obtain the power supply voltage VH according to the first voltage V1 and the voltage QB_GATE of the control terminal of the first power tube QB. In addition, the power supply circuit 100 can transmit the power supply voltage VH to the charge pump circuit 200, the control circuit 4000 and the first voltage adjustment circuit 300 respectively, so that the charge pump circuit 200, the control circuit 4000 and the first voltage adjustment circuit 300 can work, so that the charge pump circuit 200 can obtain the second voltage VP_H, the control circuit 4000 can drive the sixth power tube QBAT, and the first voltage adjustment circuit 300 can obtain the adjusted voltage on the bootstrap capacitor CDRV.

[0109] The power supply voltage VH is controlled by the clamping circuit in the control circuit 4000, and the minimum voltage between the battery voltage VBAT and the output voltage VSYS is selected, and the voltage summed with a voltage of, for example, 5V is used as the start-up voltage of the sixth power tube QBAT, that is, (VBAT, VSYS)min+5V.

[0110] Under the action of the power supply voltage VH, the charge pump circuit 200 can obtain the second voltage VP_H according to the voltage VPMID of the first end of the first power tube QB and the output voltage VSYS, so that the second voltage VP_H can charge the bootstrap capacitor CDRV in the charge pump circuit 200, so that the voltage on the bootstrap capacitor CDRV can be used as the power supply voltage of the first driver DRV1. Under the action of the voltage on the bootstrap capacitor CDRV, the first driver DRV1 can drive the second power tube Q1 to turn on according to the drive signal Q1_ON. In other words, the bootstrap capacitor CDRV is used as the driving power supply of the first driver DRV1.

[0111] The second voltage VP_H is used to charge the bootstrap capacitor CDRV in the charge pump circuit 200 .

[0112] Under the action of the power supply voltage VH, the first voltage adjustment circuit 300 can adjust the voltage on the bootstrap capacitor CDRV to obtain the adjusted voltage on the bootstrap capacitor CDRV, so that the adjusted voltage on the bootstrap capacitor CDRV can be used as the power supply voltage of the second driver DRV2. Under the action of the adjusted voltage on the bootstrap capacitor CDRV, the second driver DRV2 can drive the corresponding power tube to turn on according to the driving signal. In other words, the bootstrap capacitor CDRV is used as the driving power supply of the second driver DRV2.

[0113] Based on the above description, it can be known that when any one of the second power tube Q1 and the power tube corresponding to the second driver DRV2 is turned on, the bootstrap capacitor CDRV can provide a supply voltage to the first driver DRV1 and the second driver DRV2.

[0114] Since the number of the bootstrap capacitor CDRV is one, the cost of the driving power supply circuit 1000 can be reduced, and the number of pins of the three-level DC converter chip occupied by the driving power supply circuit 1000 can be reduced.

[0115] In some examples, when the three-level DC converter 10000 is in the forward pass-through mode and in the working state, wherein:

[0116] The power circuit 100 can obtain the power voltage VH according to the first voltage V1 and the voltage QB_GATE of the control terminal of the first power tube QB. In addition, the power circuit 100 can transmit the power voltage VH to the control circuit 4000 to enable the control circuit 4000 to work and drive the sixth power tube QBAT.

[0117] The power supply circuit 100 can adjust the power supply voltage VH to obtain an adjusted power supply voltage, so that the adjusted power supply voltage can be used as the power supply voltage of the first driver DRV1 and the second driver DRV2. Under the effect of the adjusted power supply voltage, the first driver DRV1 can drive the second power tube Q1 to turn on according to the drive signal Q1_ON, and the second driver DRV2 can drive the corresponding power tube to turn on according to the drive signal. In other words, the power supply voltage VH provides the first driver DRV1 and the second driver DRV2 with a power supply voltage.

[0118] The driving power supply circuit, three-level DC converter, chip and electronic device provided by the present application, when the three-level DC converter is in a forward three-level buck mode, a forward charge pump mode, or a reverse boost mode, and is in a working state, the power supply circuit can obtain the power supply voltage according to the first voltage and the voltage of the control end of the first power tube, and transmit the power supply voltage to the charge pump circuit, the control circuit and the first voltage adjustment circuit respectively, so that the charge pump circuit, the control circuit and the first voltage adjustment circuit can work. Under the action of the power supply voltage, the charge pump circuit can obtain a second voltage for charging the bootstrap capacitor in the charge pump circuit according to the voltage of the first end of the first power tube and the output voltage, so that the voltage on the bootstrap capacitor can be used as the power supply voltage of the first driver, so that the power tube corresponding to the first driver is turned on. Under the action of the power supply voltage, the first voltage adjustment circuit can adjust the voltage on the bootstrap capacitor to obtain the adjusted voltage on the bootstrap capacitor, so that the adjusted voltage on the bootstrap capacitor can be used as the power supply voltage of the second driver, so that the power tube corresponding to the second driver is turned on. Since the number of bootstrap capacitors is one, the cost of the driving power supply circuit can be reduced, and the number of pins occupied by the driving power supply circuit of the three-level DC converter chip can be reduced. Therefore, the cost of the three-level DC converter can be reduced.

[0119] Based on the description of the above embodiment, a possible implementation of the charge pump circuit 200 is exemplified. Figure 2 As shown, the charge pump circuit 200 may include: a power selection circuit 210 , a second voltage adjustment circuit 220 and a first charge pump 230 .

[0120] A first input terminal of the power selection circuit 210 is electrically connected to a first terminal of the first power tube QB, a second input terminal of the power selection circuit 210 is used to access the output voltage VSYS, an output terminal of the power selection circuit 210 is electrically connected to an input terminal of the second voltage adjustment circuit 220, a power terminal of the second voltage adjustment circuit 220 is electrically connected to a first output terminal of the power circuit 100, an output terminal of the second voltage adjustment circuit 220 is electrically connected to an input terminal of the first charge pump 230, an output terminal of the first charge pump 230 is electrically connected to a power terminal of the first driver DRV1, a first terminal of the first charge pump 230 is electrically connected to a ground terminal of the first driver DRV1, and a second terminal of the first charge pump 230 and a ground terminal of the second voltage adjustment circuit 220 are both grounded.

[0121] Among them, the first input end of the power selection circuit 210 is the first input end of the charge pump circuit 200, the second input end of the power selection circuit 210 is the second input end of the charge pump circuit 200, the power end of the second voltage adjustment circuit 220 is the power end of the charge pump circuit 200, the output end of the first charge pump 230 is the output end CPO of the charge pump circuit 200, the first end of the first charge pump 230 is the ground end of the charge pump circuit 200, the output end of the second voltage adjustment circuit 220 is the first end of the charge pump circuit 200, and the second end of the first charge pump 230 is the second end of the charge pump circuit 200.

[0122] The power selection circuit 210 can select a first target voltage VPS between the voltage VPMID of the first end of the first power transistor QB and the output voltage VSYS, and can transmit the first target voltage VPS to the second voltage adjustment circuit 220 so that the second voltage adjustment circuit 220 can obtain the first target voltage VPS.

[0123] Under the action of the power supply voltage VH, the second voltage adjustment circuit 220 can work. In this way, the second voltage adjustment circuit 220 can adjust the first target voltage VPS to obtain the second voltage VP_H. In addition, the second voltage adjustment circuit 220 can transmit the second voltage VP_H to the first charge pump 230, so that the first charge pump 230 can obtain the second voltage VP_H. Furthermore, the first charge pump 230 can use the second voltage VP_H to charge the bootstrap capacitor CDRV, so that the voltage on the bootstrap capacitor CDRV can be used as the power supply voltage of the first driver DRV1. As a result, the first driver DRV1 can drive the second power tube Q1 to turn on.

[0124] In some examples, when the three-level DC converter 10000 is in the forward three-level buck mode BUCK, or the forward charge pump mode, or the forward pass-through mode, if the output voltage VSYS is greater than the preset voltage, the power selection circuit 210 can select the output voltage VSYS as the first target voltage VPS. If the output voltage VSYS is less than the preset voltage, the power selection circuit 210 can select the voltage VPMID of the first end of the first power tube QB as the first target voltage VPS.

[0125] The preset voltage is, for example, 3.8V, or, for example, 4V.

[0126] When the three-level DC converter 10000 is in the reverse boost mode BOOST, if the three-level DC converter 10000 is in the startup state, that is, the three-level DC converter 10000 is in the pre-charge state, the power selection circuit 210 can select the output voltage VSYS as the first target voltage VPS. If the three-level DC converter 10000 is in the working state, the power selection circuit 210 can select the voltage VPMID of the first end of the first power tube QB as the first target voltage VPS.

[0127] Among them, when the three-level DC converter 10000 is in the reverse boost mode BOOST and in a working state, the voltage VPMID switched from the second voltage VP_H to the first end of the first power tube QB provides a supply voltage to the first driver DRV1 and the second driver DRV2 to provide a higher driving voltage and improve the efficiency of the three-level DC converter 10000.

[0128] In summary, the power selection circuit can select a first target voltage between the voltage at the first end of the first power tube and the output voltage, and transmit the first target voltage to the second voltage adjustment circuit, so that the second voltage adjustment circuit can obtain the first target voltage. In this way, under the action of the power supply voltage, the second voltage adjustment circuit can adjust the first target voltage to obtain the second voltage, and transmit the second voltage to the first charge pump, so that the first charge pump can obtain the second voltage. Thus, the first charge pump can use the second voltage to charge the bootstrap capacitor, so that the voltage on the bootstrap capacitor can be used as the power supply voltage of the first driver.

[0129] Based on the description of the above embodiment, a possible implementation of the first charge pump 230 is exemplified. Figure 2 As shown, the first charge pump 230 may include: a first N-type power tube M1, a second N-type power tube M2, a third N-type power tube M3, a fourth N-type power tube M4, a bootstrap capacitor CDRV, a first capacitor C1, a third driver DRV3, a fourth driver DRV4, a fifth driver DRV5 and a sixth driver DRV6.

[0130] The input end of the third driver DRV3 and the input end of the fifth driver DRV5 are both used to access the first drive signal M13_ON, the input end of the fourth driver DRV4 and the input end of the sixth driver DRV6 are both used to access the second drive signal M24_ON, the output end of the third driver DRV3 is electrically connected to the control end of the first N-type power tube M1, the output end of the fourth driver DRV4 is electrically connected to the control end of the second N-type power tube M2, the second end of the first N-type power tube M1 is electrically connected to the output end of the second voltage adjustment circuit 220, the first end of the first N-type power tube M1 is electrically connected to the second end of the second N-type power tube M2, and the first end of the second N-type power tube M2 is electrically connected to the power supply end of the first driver DRV1.

[0131] The output end of the fifth driver DRV5 is electrically connected to the control end of the third N-type power tube M3, the output end of the sixth driver DRV6 is electrically connected to the control end of the fourth N-type power tube M4, the second end of the third N-type power tube M3 is grounded, the first end of the third N-type power tube M3 is electrically connected to the second end of the fourth N-type power tube M4, the first end of the fourth N-type power tube M4 is electrically connected to the ground end of the first driver DRV1, the upper plate of the bootstrap capacitor CDRV is electrically connected between the first end of the first N-type power tube M1 and the second end of the second N-type power tube M2, the lower plate of the bootstrap capacitor CDRV is electrically connected between the first end of the third N-type power tube M3 and the second end of the fourth N-type power tube M4, the upper plate of the first capacitor C1 is electrically connected between the first end of the second N-type power tube M2 and the power supply end of the first driver DRV1, and the lower plate of the first capacitor C1 is electrically connected between the first end of the fourth N-type power tube M4 and the ground end of the first driver DRV1.

[0132] The first N-type power tube M1, the second N-type power tube M2, the third N-type power tube M3 and the fourth N-type power tube M4 are, for example, metal-oxide semiconductor field effect transistors. The control end of the first N-type power tube M1, the control end of the second N-type power tube M2, the control end of the third N-type power tube M3 and the control end of the fourth N-type power tube M4 are gates of the metal-oxide semiconductor field effect transistors, the second end of the first N-type power tube M1, the second end of the second N-type power tube M2, the second end of the third N-type power tube M3 and the second end of the fourth N-type power tube M4 are sources of the metal-oxide semiconductor field effect transistors, and the first end of the first N-type power tube M1, the first end of the second N-type power tube M2, the first end of the third N-type power tube M3 and the first end of the fourth N-type power tube M4 are drains of the metal-oxide semiconductor field effect transistors.

[0133] Wherein, the first drive signal M13_ON and the second drive signal M24_ON are both used to drive the N-type power tube to be turned on or off, and the level of the first drive signal M13_ON is opposite to the level of the second drive signal M24_ON. When the first drive signal M13_ON is at a high level, the second drive signal M24_ON is at a low level. When the first drive signal M13_ON is at a low level, the second drive signal M24_ON is at a high level.

[0134] Among them, the second end of the first N-type power tube M1 is the input end of the first charge pump 230, the first end of the second N-type power tube M2 is the output end of the first charge pump 230, the first end of the fourth N-type power tube M4 is the first end of the first charge pump 230, and the second end of the third N-type power tube M3 is the second end of the first charge pump 230.

[0135] The capacitance of the bootstrap capacitor CDRV is, for example, 100 nF. The capacitance of the first capacitor C1 is, for example, 100 pF.

[0136] When the first drive signal M13_ON is at a high level and the second drive signal M24_ON is at a low level, the third driver DRV3 can drive the first N-type power tube M1 to turn on, the fifth driver DRV5 can drive the third N-type power tube M3 to turn on, the fourth driver DRV4 can drive the second N-type power tube M2 to turn off, and the sixth driver DRV6 can drive the fourth N-type power tube M4 to turn off. In this way, the first N-type power tube M1 and the third N-type power tube M3 are turned on, and the second N-type power tube M2 and the fourth N-type power tube M4 are turned off. Furthermore, the second voltage VP_H can charge the bootstrap capacitor CDRV, so that the bootstrap capacitor CDRV is in a charging state. As a result, the voltage on the bootstrap capacitor CDRV can reach the second voltage VP_H.

[0137] When the first drive signal M13_ON is at a low level and the second drive signal M24_ON is at a high level, the third driver DRV3 can drive the first N-type power tube M1 to turn off, the fifth driver DRV5 can drive the third N-type power tube M3 to turn off, the fourth driver DRV4 can drive the second N-type power tube M2 to turn on, and the sixth driver DRV6 can drive the fourth N-type power tube M4 to turn on. Furthermore, the first N-type power tube M1 and the third N-type power tube M3 are turned off, the second N-type power tube M2 and the fourth N-type power tube M4 are turned on, and the bootstrap capacitor CDRV is in a discharging state. Therefore, the voltage on the bootstrap capacitor CDRV can be used as the supply voltage of the first driver DRV1.

[0138] In summary, the third driver and the fifth driver can drive the first N-type power tube and the third N-type power tube to be turned on or off according to the first driving signal, and the fourth driver and the sixth driver can drive the second N-type power tube and the fourth N-type power tube to be turned on or off according to the second driving signal, so that the bootstrap capacitor is charged or discharged. Therefore, the voltage on the bootstrap capacitor CDRV can be used as the power supply voltage of the first driver.

[0139] Based on the above description, it can be known that when the second power tube Q1 and any one of the power tubes corresponding to the second driver DRV2 are turned on, the first drive signal M13_ON switches from a high level to a low level, and the second drive signal M24_ON switches from a low level to a high level.

[0140] In addition, after the second power tube Q1 and the power tube corresponding to the second driver DRV2 are turned on, since the current consumed by the first driver DRV1 and the second driver DRV2 is very small, usually the current consumed by the driver corresponding to one power tube is less than 3uA. Therefore, the first capacitor C1 is used to provide a supply voltage to the first driver DRV1 and the second driver DRV2.

[0141] Based on the description of the above embodiment, a possible implementation of the driving power supply circuit 1000 is exemplified. Figure 2 As shown, the driving power supply circuit 1000 may further include: a starting circuit 400 .

[0142] A first end of the start-up circuit 400 is electrically connected to a first end of the charge pump circuit 200 , a second end of the start-up circuit 400 is electrically connected to the bootstrap capacitor CDRV, and a second end of the charge pump circuit 200 is grounded.

[0143] In some examples, the startup circuit 400 may include: a switch tube B1 and a switch tube B2.

[0144] The first end of the switch tube B1 is electrically connected to the first end of the charge pump circuit 200, the first end of the switch tube B1 is electrically connected to the upper plate of the bootstrap capacitor CDRV, the lower plate of the bootstrap capacitor CDRV is electrically connected to the first end of the switch tube B2, and the second end of the switch tube B2 is grounded.

[0145] When the three-level DC converter 10000 is in the forward three-level buck mode BUCK, or the forward charge pump mode, or the forward pass-through mode, or the reverse boost mode BOOST, when the driving power supply circuit 1000 is started, that is, when the driving power supply circuit 1000 is in the pre-charge state, the starting circuit 400 can obtain the second voltage VP_H from the charge pump circuit 200. In addition, the starting circuit 400 can charge the bootstrap capacitor CDRV using the second voltage VP_H, so that the voltage on the bootstrap capacitor CDRV can reach the second voltage VP_H.

[0146] The power supply circuit 100 can use the adjusted power supply voltage to charge the output terminal CPO of the charge pump circuit 200. Thus, the driving power supply circuit 1000 can be started.

[0147] In summary, when the driving power supply circuit is started, the starting circuit can obtain the second voltage from the charge pump circuit, and use the second voltage to charge the bootstrap capacitor, so that the voltage on the bootstrap capacitor can reach the second voltage. The power supply circuit can use the adjusted power supply voltage to charge the output end of the charge pump circuit. Thus, the driving power supply circuit can be started.

[0148] Based on the description of the above embodiment, illustratively, a possible implementation of the first voltage adjustment circuit 300 or the second voltage adjustment circuit 220 is as follows. Figure 2 As shown, the first voltage adjustment circuit 300 or the second voltage adjustment circuit 220 may include: a first current source I1, a first N-type MOS transistor N1 and a first diode D1.

[0149] An input end of the first current source I1 is electrically connected to a first output end of the power supply circuit 100, an output end of the first current source I1 is electrically connected to a control end of the first N-type MOS transistor N1, a first end of the first N-type MOS transistor N1 is electrically connected to an output end CPO of the charge pump circuit 200, or an output end of the power supply selection circuit 210, a cathode of the first diode D1 is electrically connected between the output end of the first current source I1 and the control end of the first N-type MOS transistor N1, a second end of the first N-type MOS transistor N1 is electrically connected to a power supply end of the second driver DRV2, or an input end of the first charge pump 230, and an anode of the first diode D1 is electrically connected to a ground end of the second driver DRV2, or the anode of the first diode D1 is grounded.

[0150] The first N-type MOS transistor N1 is, for example, a metal-oxide semiconductor field effect transistor. The first end of the first N-type MOS transistor N1 is the drain of the metal-oxide semiconductor field effect transistor, the second end of the first N-type MOS transistor N1 is the source of the metal-oxide semiconductor field effect transistor, and the control end of the first N-type MOS transistor N1 is the gate of the metal-oxide semiconductor field effect transistor.

[0151] In which, when the first voltage adjustment circuit 300 includes a first current source I1, a first N-type MOS transistor N1 and a first diode D1, a first end of the first N-type MOS transistor N1 is electrically connected to the output end CPO of the charge pump circuit 200, a second end of the first N-type MOS transistor N1 is electrically connected to the power supply end of the second driver DRV2, and an anode of the first diode D1 is electrically connected to the ground end of the second driver DRV2.

[0152] In which, when the second voltage adjustment circuit 220 includes a first current source I1, a first N-type MOS transistor N1 and a first diode D1, a first end of the first N-type MOS transistor N1 is electrically connected to the output end of the power selection circuit 210, a second end of the first N-type MOS transistor N1 is electrically connected to the input end of the first charge pump 230, and the anode of the first diode D1 is grounded.

[0153] Among them, the input end of the first current source I1 is the power supply end of the first voltage adjustment circuit 300 or the power supply end of the second voltage adjustment circuit 220, the first end of the first N-type MOS tube N1 is the input end of the first voltage adjustment circuit 300 or the input end of the second voltage adjustment circuit 220, the second end of the first N-type MOS tube N1 is the output end of the first voltage adjustment circuit 300 or the output end of the second voltage adjustment circuit 220, and the anode of the first diode D1 is the ground end of the first voltage adjustment circuit 300 or the ground end of the second voltage adjustment circuit 220.

[0154] The first current source I1 is a high voltage current source, which can generate a current between 1uA and 50uA. The first diode D1 is, for example, a Zener diode, and the breakdown voltage of the Zener diode is usually 5.5V. The threshold voltage of the first N-type MOS transistor N1 is, for example, 0.7V.

[0155] Combine the following Figure 7 , Figure 7 Shows Figure 2 The working principle of the first voltage regulating circuit 300 or the second voltage regulating circuit 220 is described in detail.

[0156] For the convenience of explanation, the voltage at the first end of the first N-type MOS transistor N1 is represented by VIN, the voltage at the second end of the first N-type MOS transistor N1 is represented by HVDD, and the anode voltage of the first diode D1 is represented by HVSS.

[0157] When VIN-HVSS>VZ-VTHN, the first N-type MOS transistor N1 is in the saturation region. Thus, the output voltage of the first voltage adjustment circuit 300 can be expressed by formula (1):

[0158] HVDD - HVSS = VZ - VTHN (1)

[0159] Wherein, HVDD is the voltage at the second terminal of the first N-type MOS transistor N1, HVSS is the voltage at the positive electrode of the first diode D1, VZ is the breakdown voltage of the first diode D1, and VTHN is the threshold voltage of the first N-type MOS transistor N1.

[0160] When VIN - HVSS < VZ - VTHN, the first N-type MOS transistor N1 is in the linear region. Thus, the output voltage of the first voltage adjustment circuit 300 can be expressed by formula (2):

[0161] HVDD - HVSS = VIN - HVSS (2)

[0162] Based on the description of the above embodiments, exemplarily, a possible implementation of the power supply circuit 100. As Figure 2 shown, the power supply circuit 100 may include: a first high-selection circuit 110, a third voltage adjustment circuit 120, a second charge pump 130, a third charge pump 140, and a switching transistor H.

[0163] The input terminal of the second charge pump 130 is electrically connected to the second terminal of the first power transistor QB, the output terminal of the second charge pump 130 is electrically connected to the first terminal of the switching transistor H, the second terminal of the switching transistor H is electrically connected to the control terminal of the first power transistor QB, the control terminal of the switching transistor H is used to receive a control signal, the control signal is used to control the conduction or cutoff of the switching transistor H, the input terminal of the third charge pump 140 is used to receive the first voltage V1, the output terminal of the third charge pump 140 is electrically connected to the first input terminal of the first high-selection circuit 110, the second input terminal of the first high-selection circuit 110 is electrically connected between the second terminal of the switching transistor H and the control terminal of the first power transistor QB, the output terminal of the first high-selection circuit 110 is electrically connected to the power supply terminal of the charge pump circuit 200, the input terminal of the third voltage adjustment circuit 120, the power supply terminal of the third voltage adjustment circuit 120, and the power supply terminal of the first voltage adjustment circuit 300 respectively, the output terminal of the third voltage adjustment circuit 120 is electrically connected between the output terminal CPO of the charge pump circuit 200 and the power supply terminal of the first driver DRV1, and the ground terminal of the third voltage adjustment circuit 120 is electrically connected to the ground terminal of the first driver DRV1.

[0164] Wherein, the switching transistor H is, for example, a metal-oxide-semiconductor field-effect transistor. The control terminal of the switching transistor H refers to the gate of the metal-oxide-semiconductor field-effect transistor, the first terminal of the switching transistor H may be the drain or source of the metal-oxide-semiconductor field-effect transistor, and correspondingly, the second terminal of the switching transistor H may be the source or drain of the metal-oxide-semiconductor field-effect transistor.

[0165] Among them, the second input end of the first high selection circuit 110 is the first input end of the power supply circuit 100, the input end of the third charge pump 140 is the second input end of the power supply circuit 100, the output end of the first high selection circuit 110 is the first output end of the power supply circuit 100, and the output end of the third voltage adjustment circuit 120 is the second output end of the power supply circuit 100.

[0166] The switch state of the switch tube H is the same as the switch state of the first power tube QB. When the first power tube QB is in the on state, the switch tube H is in the on state. When the first power tube QB is in the off state, the switch tube H is in the off state.

[0167] The second charge pump 130 can obtain the input voltage VBUS from the first power transistor QB. Furthermore, the second charge pump 130 can boost the input voltage VBUS to obtain the third voltage CP_VBUS.

[0168] The third voltage CP_VBUS is the sum of the input voltage VBUS and a voltage of, for example, 5 V, ie, VBUS+5 V. The second charge pump 130 is used as a start-up power source for the first power transistor QB.

[0169] The switch tube H can determine whether to connect the output end of the second charge pump 130 and the control end of the first power tube QB according to the control signal, so that the third voltage CP_VBUS can be used as the voltage of the control end of the first power tube QB.

[0170] The third charge pump 140 can boost the first voltage V1 to obtain a boosted first voltage VH3, and can transmit the boosted first voltage VH3 to the first high selection circuit 110, so that the first high selection circuit 110 can obtain the boosted first voltage VH3.

[0171] When twice the first voltage V1 is less than, for example, a voltage of 6V, the boosted first voltage VH3 is 3 times the first voltage V1, i.e., VI*3. When twice the first voltage V1 is greater than, for example, a voltage of 6V, the boosted first voltage VH3 is the sum of the first voltage V1 and 6V, i.e., VI+6V.

[0172] The first high selection circuit 110 can obtain the voltage QB_GATE of the control terminal of the first power tube QB from the first power tube QB. In addition, the first high selection circuit 110 can select the maximum voltage from the boosted first voltage VH3 and the voltage QB_GATE of the control terminal of the first power tube QB as the power supply voltage VH. Thus, the power supply circuit 100 can obtain the power supply voltage VH.

[0173] At the same time, the first high selection circuit 110 can transmit the power supply voltage VH to the third voltage adjustment circuit 120, so that the third voltage adjustment circuit 120 can obtain the power supply voltage VH. Then, the third voltage adjustment circuit 120 can adjust the power supply voltage VH to obtain the adjusted power supply voltage. Thus, the power supply circuit 100 can obtain the adjusted power supply voltage.

[0174] In some examples, the first select high circuit 110 may include: a second diode D2 and a third diode D3.

[0175] The anode of the second diode D2 is electrically connected between the second end of the switch tube H and the control end of the first power tube QB, the cathode of the second diode D2 is electrically connected to the cathode of the third diode D3, the anode of the third diode D3 is electrically connected to the output end of the third charge pump 140, and the power supply end of the charge pump circuit 200 is electrically connected between the cathode of the second diode D2 and the cathode of the third diode D3.

[0176] Among them, the anode of the third diode D3 is the first input end of the first high selection circuit 110, the anode of the second diode D2 is the second input end of the first high selection circuit 110, and the output end of the first high selection circuit 110 is located between the cathode of the second diode D2 and the cathode of the third diode D3.

[0177] When the three-level DC converter 10000 is in the forward three-level buck mode BUCK, and the driving power supply circuit 1000 is in the startup state, since the first power tube QB is in the on state, the switch tube H is in the on state. In this way, the voltage at the control end of the first power tube QB is the third voltage CP_VBUS. In this way, the first high selection circuit 110 can select the maximum voltage as the power supply voltage VH from the boosted first voltage VH3 and the third voltage CP_VBUS. Furthermore, the power supply voltage VH can be charged to the output terminal CPO of the charge pump circuit 200 after passing through the third voltage adjustment circuit 120. Thus, the adjusted power supply voltage can be charged to the output terminal CPO of the charge pump circuit 200.

[0178] When the three-level DC converter 10000 is in the reverse boost mode BOOST and the driving power supply circuit 1000 is in the startup state, since the first power tube QB is in the off state, the switch tube H is in the off state. In this way, the voltage at the control end of the first power tube QB is 0V. In this way, the first high selection circuit 110 can select the maximum voltage from the boosted first voltage VH3 and 0V as the power supply voltage VH. Furthermore, the power supply voltage VH is charged to the output terminal CPO of the charge pump circuit 200 after passing through the third voltage adjustment circuit 120. Thus, the adjusted power supply voltage can charge the output terminal CPO of the charge pump circuit 200.

[0179] The power supply voltage VH is the difference between the boosted first voltage VH3 and the voltage drop of the third diode D3 , and the voltage drop of the third diode D3 is usually, for example, 0.5 V. Therefore, the power supply voltage VH=VH3-0.5V.

[0180] When the three-level DC converter 10000 is in the forward charge pump mode or the forward pass mode, and the driving power supply circuit 1000 is in the startup state, since the first power tube QB is in the on state, the switch tube H is in the on state. In this way, the voltage at the control end of the first power tube QB is the third voltage CP_VBUS. In this way, the first high selection circuit 110 can select the maximum voltage as the power supply voltage VH from the boosted first voltage VH3 and the third voltage CP_VBUS. Furthermore, the power supply voltage VH can be charged to the output terminal CPO of the charge pump circuit 200 after passing through the third voltage adjustment circuit 120. Thus, the adjusted power supply voltage can be charged to the output terminal CPO of the charge pump circuit 200.

[0181] In summary, the second charge pump can obtain an input voltage from the first power tube, and boost the input voltage to obtain a third voltage. The switch tube can determine whether to connect the output end of the second charge pump and the control end of the first power tube according to the control signal, so that the third voltage is used as the voltage of the control end of the first power tube. The third charge pump can boost the first voltage to obtain the boosted first voltage, and transmit the boosted first voltage to the first high selection circuit, so that the first high selection circuit can obtain the boosted first voltage. The first high selection circuit can obtain the voltage of the control end of the first power tube from the first power tube. In addition, the first high selection circuit can select the maximum voltage from the boosted first voltage and the voltage of the control end of the first power tube as the power supply voltage. Thus, the power supply circuit can obtain the power supply voltage. At the same time, the first high selection circuit can transmit the power supply voltage to the third voltage adjustment circuit, so that the third voltage adjustment circuit can obtain the power supply voltage. In this way, the third voltage adjustment circuit can adjust the power supply voltage to obtain the adjusted power supply voltage. Thus, the source circuit can obtain the adjusted power supply voltage.

[0182] Based on the description of the above embodiment, a possible implementation of the third voltage adjustment circuit 120 is exemplified. Figure 2 As shown, the third voltage adjustment circuit 120 may include: a second current source I2, a third current source I3, a second N-type MOS transistor N2 and a fourth diode D4.

[0183] The input end of the second current source I2 and the input end of the third current source I3 are both electrically connected to the output end of the first high selection circuit 110, the output end of the second current source I2 is electrically connected to the first end of the second N-type MOS tube N2, the control end of the second N-type MOS tube N2 is electrically connected to the output end of the third current source I3, the second end of the second N-type MOS tube N2 is electrically connected between the output end CPO of the charge pump circuit 200 and the power supply end of the first driver DRV1, the cathode of the fourth diode D4 is electrically connected between the control end of the second N-type MOS tube N2 and the output end of the third current source I3, and the anode of the fourth diode D4 is electrically connected to the ground end of the first driver DRV1.

[0184] The second N-type MOS transistor N2 is, for example, a metal-oxide semiconductor field effect transistor. The first end of the second N-type MOS transistor N2 is the drain of the metal-oxide semiconductor field effect transistor, the second end of the second N-type MOS transistor N2 is the source of the metal-oxide semiconductor field effect transistor, and the control end of the second N-type MOS transistor N2 is the gate of the metal-oxide semiconductor field effect transistor.

[0185] Among them, the input end of the second current source I2 is the input end of the third voltage adjustment circuit 120, the input end of the third current source I3 is the power supply end of the third voltage adjustment circuit 120, the second end of the second N-type MOS tube N2 is the output end of the third voltage adjustment circuit 120, and the anode of the fourth diode D4 is the ground end of the third voltage adjustment circuit 120.

[0186] The working principle of the third voltage adjustment circuit 120 is similar to the working principle of the first voltage adjustment circuit 300 or the second voltage adjustment circuit 220 , and thus will not be elaborated herein.

[0187] Based on the description of the above embodiment, a possible implementation of the driving power supply circuit 1000 is exemplified. Figure 2 As shown, the driving power supply circuit 1000 may further include: a second high voltage selection circuit 500 , a third high voltage selection circuit 600 and a linear voltage stabilization circuit 700 .

[0188] The input end of the linear voltage regulator circuit 700 is electrically connected to the second end of the first power tube QB, the output end of the linear voltage regulator circuit 700 is electrically connected to the first input end of the second high selection circuit 500, the second input end of the second high selection circuit 500 is used to connect to the battery voltage VBAT, the output end of the second high selection circuit 500 is respectively electrically connected to the first input end of the third high selection circuit 600 and the power supply end of the second charge pump 130, the second input end of the third high selection circuit 600 is electrically connected to the first end of the charge pump circuit 200, and the output end of the third high selection circuit 600 is electrically connected to the input end of the third charge pump 140.

[0189] The output terminal of the third high voltage selection circuit 600 is also used to output the first voltage V1.

[0190] The linear voltage regulator circuit 700 can obtain the input voltage VBUS from the first power tube QB. In addition, the linear voltage regulator circuit 700 can step down the input voltage VBUS to obtain the fourth voltage V4. At the same time, the linear voltage regulator circuit 700 can transmit the fourth voltage V4 to the second high selection circuit 500, so that the second high selection circuit 500 can obtain the fourth voltage V4.

[0191] Thus, the second high selection circuit 500 can select the maximum voltage from the fourth voltage V4 and the battery voltage VBAT as the second target voltage DVDD. Furthermore, the second high selection circuit 500 can transmit the second target voltage DVDD to the third high selection circuit 600, so that the third high selection circuit 600 can obtain the second target voltage DVDD.

[0192] The third high selection circuit 600 can obtain the second voltage VP_H from the charge pump circuit 200. In addition, the third high selection circuit 600 can select the maximum voltage from the second voltage VP_H and the second target voltage DVDD as the first voltage V1. Thus, the third high selection circuit 600 can output the first voltage V1, so that the third charge pump 140 can obtain the first voltage V1.

[0193] In summary, the linear voltage regulator circuit can obtain an input voltage from the first power tube, and step down the input voltage to obtain a fourth voltage, and transmit the fourth voltage to the second high selection circuit, so that the second high selection circuit can obtain the fourth voltage. The third high selection circuit can obtain the second voltage from the charge pump circuit, and select the maximum voltage from the second voltage and the second target voltage as the first voltage. Thus, the third high selection circuit can output the first voltage, so that the third charge pump can obtain the first voltage.

[0194] Based on the description of the above embodiment, a possible implementation of the three-level DC converter 10000 is exemplified. Figure 2 As shown, the three-level DC converter 10000 may further include: a second capacitor CPMID and a third capacitor CB.

[0195] The upper plate of the second capacitor CPMID is electrically connected between the first end of the first power tube QB and the first end of the second power tube Q1, the upper plate of the third capacitor CB is electrically connected to the third end of the first power tube group 2000, and the lower plate of the second capacitor CPMID and the lower plate of the third capacitor CB are both grounded.

[0196] When the three-level DC converter 10000 is in the forward three-level buck mode and in working state, the voltage V_CFLY on the flying capacitor CFLY can be balanced by the third capacitor CB, so that the voltage V_CFLY on the flying capacitor CFLY is equal to the voltage V_CB on the third capacitor CB and is half of the input voltage VBUS, that is, V_CFLY=V_CB=VBUS / 2.

[0197] The ripple at the first end PMID of the first power tube QB is reduced by the second capacitor CPMID.

[0198] Based on the description of the above embodiment, a possible implementation of the first power tube group 2000 is exemplified. Figure 2 As shown, the first power tube group 2000 may include: a power tube QBL1 and a power tube QBL2.

[0199] The first end of the power tube QBL1 is electrically connected between the second end of the third power tube Q2 and the first end of the fourth power tube Q3, the control end of the power tube QBL1 is electrically connected to the output end of the fourth sub-driver DRV2-4, the second end of the power tube QBL1 is electrically connected to the second end of the power tube QBL2, the control end of the power tube QBL2 is electrically connected between the control end of the power tube QBL1 and the output end of the fourth sub-driver DRV2-4, the first end of the power tube QBL2 is electrically connected to the upper plate of the third capacitor CB, and the ground end of the fourth sub-driver DRV2-4 is electrically connected between the second end of the power tube QBL1 and the second end of the power tube QBL2.

[0200] The power tube QBL1 and the power tube QBL2 are, for example, metal-oxide semiconductor field effect transistors. The first end of the power tube QBL1 and the first end of the power tube QBL2 are drains of the metal-oxide semiconductor field effect transistors, the second end of the power tube QBL1 and the second end of the power tube QBL2 are sources of the metal-oxide semiconductor field effect transistors, and the control end of the power tube QBL1 and the control end of the power tube QBL2 are gates of the metal-oxide semiconductor field effect transistors.

[0201] Among them, the first end of the power tube QBL1 is the first end of the first power tube group 2000, the control end of the power tube QBL1 is the control end of the first power tube group 2000, the second end of the power tube QBL1 is the second end of the first power tube group 2000, and the first end of the power tube QBL2 is the third end of the first power tube group 2000.

[0202] Based on the description of the above embodiment, a possible implementation of the second power tube group 3000 is exemplified. Figure 2As shown, the second power tube group 3000 may include: a power tube QBYP1 and a power tube QBYP2.

[0203] The first end of the power tube QBYP1 is electrically connected between the second end of the third power tube Q2 and the first end of the fourth power tube Q3, the control end of the power tube QBYP1 is electrically connected to the output end of the fifth sub-driver DRV2-5, the second end of the power tube QBYP1 is electrically connected to the second end of the power tube QBYP2, the control end of the power tube QBYP2 is electrically connected between the control end of the power tube QBYP1 and the output end of the fifth sub-driver DRV2-5, the first end of the power tube QBYP2 is used to access the battery voltage VBAT, and the ground end of the fifth sub-driver DRV2-5 is electrically connected between the second end of the power tube QBYP1 and the second end of the power tube QBYP2.

[0204] The power tube QBYP1 and the power tube QBYP2 are, for example, metal-oxide semiconductor field effect transistors. The first end of the power tube QBYP1 and the first end of the power tube QBYP2 are drains of the metal-oxide semiconductor field effect transistors, the second end of the power tube QBYP1 and the second end of the power tube QBYP2 are sources of the metal-oxide semiconductor field effect transistors, and the control end of the power tube QBYP1 and the control end of the power tube QBYP2 are gates of the metal-oxide semiconductor field effect transistors.

[0205] Among them, the first end of the power tube QBYP1 is the first end of the second power tube group 3000, the control end of the power tube QBYP1 is the control end of the second power tube group 3000, the second end of the power tube QBYP1 is the second end of the second power tube group 3000, and the first end of the power tube QBYP2 is the third end of the second power tube group 3000.

[0206] In some examples, the three-level DC converter 10000 may further include: a starting circuit X.

[0207] When the three-level DC converter 10000 is in the forward three-level buck mode BUCK and in the startup state, the flying capacitor CFLY and the third capacitor CB are charged to half of the input voltage VBUS, i.e., VBUS / 2, through the startup circuit X, so that the three-level DC converter 10000 can be started.

[0208] When the three-level DC converter 10000 is in the reverse boost mode BOOST and in the startup state, the flying capacitor CFLY is charged by the startup circuit X to the difference between the battery voltage VBAT and a voltage of, for example, 0.5V, i.e., VBAT-0.5V, so that the three-level DC converter 10000 can be started.

[0209] When the three-level DC converter 10000 is in the forward charge pump mode or the forward pass mode and is in the startup state, the flying capacitor CFLY is charged to the battery voltage VBAT through the startup circuit X, so that the three-level DC converter 10000 can be started.

[0210] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A driving power supply circuit, characterized in that: The driving power supply circuit is applied to a three-level DC converter, and the three-level DC converter comprises: a first power tube, a control circuit, a first driver and at least one second driver; the driving power supply circuit comprises: a power supply circuit, a charge pump circuit and at least one first voltage adjustment circuit; The first input end of the power supply circuit is electrically connected to the control end of the first power tube, the second input end of the power supply circuit is used to access the first voltage, the first output end of the power supply circuit is electrically connected to the power supply end of the charge pump circuit, the power supply end of the control circuit and the power supply end of the first voltage adjustment circuit respectively, the first input end of the charge pump circuit is electrically connected to the first end of the first power tube, the second input end of the charge pump circuit is used to access the output voltage of the three-level DC converter, the output end of the charge pump circuit is electrically connected to the power supply end of the first driver and the input end of the first voltage adjustment circuit respectively, the output end of the first voltage adjustment circuit is electrically connected to the power supply end of the second driver, the ground end of the first voltage adjustment circuit is electrically connected to the ground end of the second driver, the second output end of the power supply circuit is electrically connected between the output end of the charge pump circuit and the power supply end of the first driver, and the ground end of the power supply circuit and the ground end of the charge pump circuit are both electrically connected to the ground end of the first driver; When the three-level DC converter is in a forward three-level buck mode, a forward charge pump mode, or a reverse boost mode, and is in a working state, the forward three-level buck mode means that the input voltage of the three-level DC converter is less than the output voltage, the forward charge pump mode means that the input voltage is equal to twice the output voltage, and the reverse boost mode means that the output end of the three-level DC converter supplies reverse power to the input end, so that the input voltage is greater than the output voltage, wherein: The power supply circuit is used to obtain a power supply voltage according to the first voltage and the voltage of the control end of the first power tube, and transmit the power supply voltage to the charge pump circuit, the control circuit and the first voltage adjustment circuit respectively, so that the charge pump circuit, the control circuit and the first voltage adjustment circuit can work; The charge pump circuit is used to obtain a second voltage according to the voltage of the first end of the first power tube and the output voltage under the action of the power supply voltage, and the second voltage is used to charge the bootstrap capacitor in the charge pump circuit, so that the voltage on the bootstrap capacitor is used as the power supply voltage of the first driver, so that the power tube corresponding to the first driver is turned on, and the number of the bootstrap capacitor is one; The first voltage adjustment circuit is used to adjust the voltage on the bootstrap capacitor under the action of the power supply voltage to obtain the adjusted voltage on the bootstrap capacitor, and the adjusted voltage on the bootstrap capacitor is used as the power supply voltage of the second driver to turn on the power tube corresponding to the second driver.

2. The circuit according to claim 1, characterized in that When the three-level DC converter is in a pass-through mode and in a working state, the pass-through mode means that the input voltage is equal to the output voltage, wherein: The power supply circuit is used to obtain a power supply voltage according to the first voltage and the voltage of the control end of the first power tube, and transmit the power supply voltage to the control circuit so that the control circuit can work; The power supply circuit is also used to adjust the power supply voltage to obtain an adjusted power supply voltage, and the adjusted power supply voltage is used as the power supply voltage of the first driver and the second driver to turn on the power tube corresponding to the first driver and the power tube corresponding to the second driver.

3. The circuit according to claim 2, characterized in that The driving power supply circuit further includes: a starting circuit; The first end of the startup circuit is electrically connected to the first end of the charge pump circuit, the second end of the startup circuit is electrically connected to the bootstrap capacitor, and the second end of the charge pump circuit is grounded; The startup circuit is used to obtain the second voltage from the charge pump circuit when the drive power supply circuit is started, and use the second voltage to charge the bootstrap capacitor to start the drive power supply circuit; The power supply circuit is further used to charge the output end of the charge pump circuit using the adjusted power supply voltage to start the driving power supply circuit.

4. The circuit according to claim 2, characterized in that The charge pump circuit comprises: a power selection circuit, a second voltage adjustment circuit and a first charge pump; The first input end of the power selection circuit is electrically connected to the first end of the first power tube, the second input end of the power selection circuit is used to access the output voltage, the output end of the power selection circuit is electrically connected to the input end of the second voltage adjustment circuit, the power end of the second voltage adjustment circuit is electrically connected to the first output end of the power circuit, the output end of the second voltage adjustment circuit is electrically connected to the input end of the first charge pump, the output end of the first charge pump is electrically connected to the power end of the first driver, the first end of the first charge pump is electrically connected to the ground end of the first driver, and the second end of the first charge pump and the ground end of the second voltage adjustment circuit are both grounded; The power selection circuit is used to select a first target voltage between the voltage of the first end of the first power tube and the output voltage, and transmit the first target voltage to the second voltage adjustment circuit; The second voltage adjustment circuit is used to adjust the first target voltage under the action of the power supply voltage to obtain the second voltage, and transmit the second voltage to the first charge pump; The first charge pump is used to charge the bootstrap capacitor using the second voltage.

5. The circuit according to claim 4, characterized in that The first charge pump includes: a first N-type power tube, a second N-type power tube, a third N-type power tube, a fourth N-type power tube, a bootstrap capacitor, a first capacitor, a third driver, a fourth driver, a fifth driver and a sixth driver; The input end of the third driver and the input end of the fifth driver are both used to receive a first drive signal, the input end of the fourth driver and the input end of the sixth driver are both used to receive a second drive signal, the first drive signal and the second drive signal are both used to drive the N-type power tube to be turned on or off, and the level of the first drive signal is opposite to the level of the second drive signal, the output end of the third driver is electrically connected to the control end of the first N-type power tube, the output end of the fourth driver is electrically connected to the control end of the second N-type power tube, the second end of the first N-type power tube is electrically connected to the output end of the second voltage adjustment circuit, the first end of the first N-type power tube is electrically connected to the second end of the second N-type power tube, and the first end of the second N-type power tube is electrically connected to the power supply end of the first driver; The output end of the fifth driver is electrically connected to the control end of the third N-type power tube, the output end of the sixth driver is electrically connected to the control end of the fourth N-type power tube, the second end of the third N-type power tube is grounded, the first end of the third N-type power tube is electrically connected to the second end of the fourth N-type power tube, the first end of the fourth N-type power tube is electrically connected to the ground end of the first driver, the upper plate of the bootstrap capacitor is electrically connected between the first end of the first N-type power tube and the second end of the second N-type power tube, the lower plate of the bootstrap capacitor is electrically connected between the first end of the third N-type power tube and the second end of the fourth N-type power tube, the upper plate of the first capacitor is electrically connected between the first end of the second N-type power tube and the power supply end of the first driver, and the lower plate of the first capacitor is electrically connected between the first end of the fourth N-type power tube and the ground end of the first driver.

6. The circuit according to claim 4, characterized in that The power supply selection circuit is specifically used for selecting the output voltage as the first target voltage if the output voltage is greater than a preset voltage when the three-level DC converter is in the forward three-level buck mode, the forward charge pump mode, or the pass-through mode; and selecting the voltage of the first end of the first power tube as the first target voltage if the output voltage is less than the preset voltage; or, The power selection circuit is specifically used to select the output voltage as the first target voltage if the three-level DC converter is in the reverse boost mode and to select the voltage of the first end of the first power tube as the first target voltage if the three-level DC converter is in the startup state when the three-level DC converter is in the reverse boost mode; and to select the voltage of the first end of the first power tube as the first target voltage if the three-level DC converter is in the working state.

7. The circuit according to claim 4, characterized in that The first voltage adjustment circuit or the second voltage adjustment circuit comprises: a first current source, a first N-type MOS transistor and a first diode; The input end of the first current source is electrically connected to the first output end of the power supply circuit, the output end of the first current source is electrically connected to the control end of the first N-type MOS transistor, the first end of the first N-type MOS transistor is electrically connected to the output end of the charge pump circuit, or the output end of the power supply selection circuit, the cathode of the first diode is electrically connected between the output end of the first current source and the control end of the first N-type MOS transistor, the second end of the first N-type MOS transistor is electrically connected to the power supply end of the second driver, or the input end of the first charge pump, and the anode of the first diode is electrically connected to the ground end of the second driver, or the anode of the first diode is grounded.

8. The circuit according to any one of claims 1 to 7, characterized in that: The power supply circuit comprises: a first high voltage selection circuit, a third voltage adjustment circuit, a second charge pump, a third charge pump and a switch tube; The input end of the second charge pump is electrically connected to the second end of the first power tube, the output end of the second charge pump is electrically connected to the first end of the switch tube, the second end of the switch tube is electrically connected to the control end of the first power tube, the control end of the switch tube is used to access a control signal, and the control signal is used to control the on or off of the switch tube, the input end of the third charge pump is used to access the first voltage, the output end of the third charge pump is electrically connected to the first input end of the first high selection circuit, the second input end of the first high selection circuit is electrically connected between the second end of the switch tube and the control end of the first power tube, the output end of the first high selection circuit is electrically connected to the power supply end of the charge pump circuit, the input end of the third voltage adjustment circuit, the power supply end of the third voltage adjustment circuit and the power supply end of the first voltage adjustment circuit respectively, the output end of the third voltage adjustment circuit is electrically connected between the output end of the charge pump circuit and the power supply end of the first driver, and the ground end of the third voltage adjustment circuit is electrically connected to the ground end of the first driver; The second charge pump is used to obtain the input voltage from the first power tube and boost the input voltage to obtain a third voltage; The switch tube is used to determine whether to connect the output end of the second charge pump and the control end of the first power tube according to the control signal, so that the third voltage is used as the voltage of the control end of the first power tube; The third charge pump is used to boost the first voltage to obtain a boosted first voltage, and transmit the boosted first voltage to the first high voltage selection circuit; The first high selection circuit is used to obtain the voltage of the control end of the first power tube from the first power tube; The first high selection circuit is further used to select a maximum voltage from the boosted first voltage and the voltage at the control end of the first power tube as the power supply voltage, and transmit the power supply voltage to the third voltage adjustment circuit; The third voltage adjustment circuit is used to adjust the power supply voltage to obtain the adjusted power supply voltage.

9. The circuit according to claim 8, characterized in that The first high selection circuit includes: a second diode and a third diode; The anode of the second diode is electrically connected between the second end of the switch tube and the control end of the first power tube, the cathode of the second diode is electrically connected to the cathode of the third diode, the anode of the third diode is electrically connected to the output end of the third charge pump, and the power supply end of the charge pump circuit is electrically connected between the cathode of the second diode and the cathode of the third diode.

10. The circuit according to claim 8, characterized in that The third voltage adjustment circuit comprises: a second current source, a third current source, a second N-type MOS tube and a fourth diode; The input end of the second current source and the input end of the third current source are both electrically connected to the output end of the first high selection circuit, the output end of the second current source is electrically connected to the first end of the second N-type MOS tube, the control end of the second N-type MOS tube is electrically connected to the output end of the third current source, the second end of the second N-type MOS tube is electrically connected between the output end of the charge pump circuit and the power supply end of the first driver, the cathode of the fourth diode is electrically connected between the control end of the second N-type MOS tube and the output end of the third current source, and the anode of the fourth diode is electrically connected to the ground end of the first driver.

11. The circuit according to claim 8, characterized in that The driving power supply circuit also includes: a second high selection circuit, a third high selection circuit and a linear voltage stabilization circuit; The input end of the linear voltage stabilizing circuit is electrically connected to the second end of the first power tube, the output end of the linear voltage stabilizing circuit is electrically connected to the first input end of the second high selection circuit, the second input end of the second high selection circuit is used to access the battery voltage, the output end of the second high selection circuit is electrically connected to the first input end of the third high selection circuit and the power supply end of the second charge pump respectively, the second input end of the third high selection circuit is electrically connected to the first end of the charge pump circuit, and the output end of the third high selection circuit is electrically connected to the input end of the third charge pump; The linear voltage stabilizing circuit is used to obtain the input voltage from the first power tube, step down the input voltage to obtain a fourth voltage, and transmit the fourth voltage to the second high selection circuit; The second high selection circuit is used to select a maximum voltage from the fourth voltage and the battery voltage as a second target voltage, and transmit the second target voltage to the third high selection circuit; The third high selection circuit is used to obtain the second voltage from the charge pump circuit, and select a maximum voltage from the second voltage and the second target voltage as the first voltage.

12. A three-level DC converter, characterized in that: include: A first power tube, a second power tube, a third power tube, a fourth power tube, a fifth power tube, a sixth power tube, a first power tube group, a second power tube group, a control circuit, a first driver, a first sub-driver, a second sub-driver, a third sub-driver, a fourth sub-driver, a fifth sub-driver, a flying capacitor, a freewheeling inductor, and a drive power supply circuit as described in any one of claims 1 to 11; The second end of the first power tube is used to access the input voltage of the three-level DC converter, the control end of the first power tube is electrically connected to the second end of the switch tube, the first end of the first power tube is electrically connected to the first end of the second power tube, the control end of the second power tube is electrically connected to the output end of the first driver, the power supply end of the first driver is electrically connected to the output end of the charge pump circuit, the second end of the second power tube is electrically connected to the first end of the third power tube, the control end of the third power tube is electrically connected to the output end of the first sub-driver, the second end of the third power tube is electrically connected to the first end of the fourth power tube, the control end of the fourth power tube is electrically connected to the output end of the second sub-driver, the second end of the fourth power tube is electrically connected to the first end of the fifth power tube, and the control end of the fifth power tube is electrically connected to the output end of the third sub-driver; The upper plate of the flying capacitor and the ground end of the first driver are both electrically connected between the second end of the second power tube and the first end of the third power tube, the lower plate of the flying capacitor and the ground end of the second sub-driver are both electrically connected between the second end of the fourth power tube and the first end of the fifth power tube, the first end of the first power tube group, the first end of the second power tube group, the ground end of the first sub-driver and the first end of the freewheeling inductor are all electrically connected between the second end of the third power tube and the first end of the fourth power tube; The control end of the first power tube group is electrically connected to the output end of the fourth sub-driver, the ground end of the fourth sub-driver is electrically connected to the second end of the first power tube group, the control end of the second power tube group is electrically connected to the output end of the fifth sub-driver, the ground end of the fifth sub-driver is electrically connected to the second end of the second power tube group, the third end of the second power tube group and the first end of the sixth power tube are both used to access the battery voltage, the control end of the sixth power tube is electrically connected to the output end of the control circuit, the second end of the sixth power tube is electrically connected to the second end of the freewheeling inductor, the second end of the freewheeling inductor is also used to output the output voltage of the three-level DC converter, and the third end of the first power tube group and the second end of the fifth power tube are both grounded; The three-level DC converter includes at least one second driver, the second driver includes the first sub-driver, the second sub-driver, the third sub-driver, the fourth sub-driver and the fifth sub-driver, and the second drivers are electrically connected to the first voltage adjustment circuit one by one.

13. The three-level DC converter according to claim 12, characterized in that: The three-level DC converter further includes: a second capacitor and a third capacitor; The upper plate of the second capacitor is electrically connected between the first end of the first power tube and the first end of the second power tube, the upper plate of the third capacitor is electrically connected to the third end of the first power tube group, and the lower plate of the second capacitor and the lower plate of the third capacitor are both grounded.

14. A chip, characterized in that: include: The driving power supply circuit according to any one of claims 1 to 11; Alternatively, a three-level DC converter as claimed in claim 12 or 13.

15. An electronic device, characterized in that: include: The chip as claimed in claim 13.

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