Driving circuit of buck-boost circuit and energy storage power supply

Abstract

The invention relates to a driving circuit of a buck-boost circuit and an energy storage power supply. Wherein the buck-boost circuit comprises a boost bridge arm and a buck bridge arm, and the driving circuit comprises a buck driving module and a boost driving module; the step-down driving module is connected with the first auxiliary power supply and the midpoint of the step-up bridge arm. The step-up driving module is connected with the second auxiliary power supply and the midpoint of the step-down bridge arm. The step-down driving module responds to potential information of a midpoint of the step-up bridge arm and converts voltage output by the first auxiliary power supply into first output voltage, and the first output voltage provides driving voltage for an upper tube of the step-down bridge arm; the boost driving module responds to potential information of the midpoint of the step-down bridge arm and converts voltage output by the second auxiliary power supply into second output voltage, and the second output voltage provides driving voltage for an upper tube of the boost bridge arm. By adopting the driving circuit, the hardware cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a driving circuit of a buck-boost circuit and an energy storage power supply. Background Art

[0002] In the field of energy storage power supply, it is usually necessary to charge the energy storage battery through the input port. Since the voltage of the input port may be higher or lower than the voltage of the energy storage battery, the input port generally adopts a buck-boost circuit with 4 switches (such as transistors). In this way, the input port can flexibly perform boost output or buck output through the buck-boost circuit.

[0003] In order to improve the working efficiency of the buck-boost circuit, in the related art, the buck-boost circuit with four switches generally has only two switches in a complementary conduction state, and the other two switches are in a normally on or normally off state. The normally on switch is usually on the high side, so the high side switch is usually driven in a floating manner.

[0004] Currently, an isolated power supply is usually generated by transformer windings, or a charge pump is generated by a dedicated pulse width modulation (PWM) output by a controller to drive the high-side switch. However, the current driving method has the problem of high hardware cost. Summary of the invention

[0005] Based on this, it is necessary to provide a driving circuit and energy storage power supply for a buck-boost circuit that can reduce hardware costs in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a driving circuit applied to a buck-boost circuit, wherein the buck-boost circuit includes a boost bridge arm and a buck bridge arm, and the driving circuit includes a buck driving module and a boost driving module; the buck driving module is respectively connected to a first auxiliary power supply and a midpoint of the boost bridge arm, and the boost driving module is respectively connected to a second auxiliary power supply and a midpoint of the buck bridge arm;

[0007] The buck driving module converts the voltage output by the first auxiliary power supply into a first output voltage in response to the potential information of the midpoint of the boost bridge arm, and the first output voltage provides a driving voltage for the upper tube of the buck bridge arm;

[0008] The boost driving module converts the voltage output by the second auxiliary power supply into a second output voltage in response to the potential information of the midpoint of the buck bridge arm, and the second output voltage provides a driving voltage for the upper tube of the boost bridge arm.

[0009] In one embodiment, the boost driving module and the buck driving module have the same structure.

[0010] In one embodiment, the buck driving module includes a first driving unit and a first bootstrap unit connected to each other; the first bootstrap unit is connected to a first auxiliary power supply;

[0011] The first driving unit drives the first bootstrap unit to charge and discharge in response to the potential information of the midpoint of the boost bridge arm, so as to convert the voltage output by the first auxiliary power supply into the first output voltage.

[0012] In one embodiment, the first bootstrap unit includes a first charging subunit and a second charging subunit; a first end of the first charging subunit is connected to the first auxiliary power supply, a first end of the second charging subunit is connected to the first end of the first charging subunit, and a second end of the second charging subunit is connected to the second end of the first charging subunit via a first driving unit;

[0013] The first driving unit is used to be in a cut-off state when the potential information of the midpoint of the boost bridge arm is a first potential, and control the first auxiliary power supply to charge the first charging sub-unit, so as to convert the voltage output by the first auxiliary power supply into the first output voltage through the discharge of the first charging sub-unit, and to be in a conducting state when the potential information of the midpoint of the boost bridge arm is a second potential, and control the first charging sub-unit to charge the second charging sub-unit, so as to convert the voltage output by the first auxiliary power supply into the first output voltage through the discharge of the second charging sub-unit.

[0014] In one embodiment, the first driving unit includes a first transistor; the second end of the first charging subunit is connected to the emitter of the first transistor, and the second end of the second charging subunit is respectively connected to the base of the first transistor and the collector of the first transistor, and the base of the first transistor is also used to receive the potential information of the midpoint of the boost bridge arm.

[0015] In one embodiment, the buck driver module further includes at least one of the following:

[0016] a first diode, wherein an anode of the first diode is connected to the first auxiliary power supply, and a cathode of the first diode is connected to a first end of the first charging subunit;

[0017] a second diode, wherein an anode of the second diode is connected to the first end of the first charging subunit, and a cathode of the second diode is connected to the first end of the second charging subunit;

[0018] a third diode, wherein an anode of the third diode is connected to the emitter of the first transistor, and a cathode of the third diode is connected to the base of the first transistor;

[0019] A fourth diode, wherein the anode of the fourth diode is connected to the base of the first transistor, and the cathode of the fourth diode is used to receive the potential information of the midpoint of the boost bridge arm.

[0020] In one embodiment, the buck driving module further includes at least one of a first resistor and a second resistor:

[0021] The first resistor is arranged between the first auxiliary power source and the first end of the first charging subunit;

[0022] The second resistor is arranged between the base of the first transistor and the second end of the second charging subunit.

[0023] In one embodiment, the driving circuit further includes a first detection module and a second detection module; the first detection module is arranged at the midpoint of the boost bridge arm, and the second detection module is arranged at the midpoint of the buck bridge arm;

[0024] A first detection module, used to determine the potential information of the midpoint of the boost bridge arm, and send the potential information of the midpoint of the boost bridge arm to the buck driving module;

[0025] The second detection module is used to determine the potential information of the midpoint of the buck bridge arm and send the potential information of the midpoint of the buck bridge arm to the boost driving module.

[0026] In one of the embodiments, the driving circuit further includes a first driver and a second driver;

[0027] The buck driving module is connected to the first driver, and the first output voltage provides a driving voltage for the upper tube of the buck bridge arm through the first driver;

[0028] The boost driving module is connected to the second driver, and the second output voltage provides a driving voltage for the upper tube of the boost bridge arm through the second driver.

[0029] In a second aspect, the present application further provides an energy storage power supply, which includes a buck-boost circuit and any one of the above drive circuits.

[0030] In the driving circuit of the buck-boost circuit and the energy storage power supply, the driving circuit includes a buck driving module and a boost driving module. Since the buck-boost circuit includes a boost bridge arm and a buck bridge arm, and the buck driving module is respectively connected to the midpoint of the first auxiliary power supply and the boost bridge arm, and the boost driving module is respectively connected to the midpoint of the second auxiliary power supply and the buck bridge arm, the buck driving module can respond to the potential information of the midpoint of the boost bridge arm, and the boost driving module can respond to the potential information of the midpoint of the buck bridge arm. Further, the buck driving module can convert the voltage output by the first auxiliary power supply into a first output voltage after responding to the potential information of the midpoint of the boost bridge arm, and the boost driving module can convert the voltage output by the second auxiliary power supply into a second output voltage after responding to the potential information of the midpoint of the buck bridge arm, so as to provide a driving voltage for the upper tube of the buck bridge arm through the first output voltage, and provide a driving voltage for the upper tube of the boost bridge arm through the second output voltage. In this process, there is no need to use the transformer winding to generate an isolated power supply, nor is there a need for the controller to output a dedicated PWM to generate a charge pump. Instead, the first output voltage and the second output voltage can provide a driving voltage for the high-side transistor, thereby reducing hardware costs. In addition, the potential information of the midpoint of the buck bridge arm and the potential information of the midpoint of the boost bridge arm can more reliably provide a driving voltage for the high-side transistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 is a schematic diagram of a driving circuit in an embodiment;

[0033] Figure 2 is a schematic diagram of a buck driving module in one embodiment;

[0034] Figure 3 is a schematic diagram of a first bootstrap unit in one embodiment;

[0035] Figure 4 is a schematic diagram of a first driving unit in one embodiment;

[0036] Figure 5 is a schematic diagram of yet another driving circuit in an embodiment;

[0037] Figure 6 is a schematic diagram of yet another driving circuit in an embodiment;

[0038] Figure 7 is a schematic diagram of yet another driving circuit in an embodiment;

[0039] Figure 8 is a schematic diagram of yet another driving circuit in an embodiment;

[0040] Fig. 9 Schematic diagram of an energy storage power supply in one embodiment. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] Figure 1 FIG. 2 is a schematic diagram of a driving circuit in an embodiment. In an embodiment, a driving circuit 200 applied to a buck-boost circuit is provided. Figure 1 A four-switch buck-boost circuit 100 is shown, wherein VIN represents the input voltage of the buck-boost circuit 100 , and VOUT represents the output voltage of the buck-boost circuit 100 .

[0043] The buck-boost circuit 100 includes a boost bridge arm and a buck bridge arm. Figure 1 In the embodiment, the boost bridge arm includes transistor Q1 and transistor Q2, and the buck bridge arm includes transistor Q3 and transistor Q4. When the buck-boost circuit 100 is in the boost mode, transistor Q3 is normally turned on, transistor Q4 is normally turned off, and transistor Q1 and transistor Q2 are complementary turned on. When the buck-boost circuit 100 is in the buck mode, transistor Q1 is normally turned on, transistor Q2 is normally turned off, and transistor Q3 and transistor Q3 are complementary turned on. It can be understood that transistor Q1 is the upper tube in the boost bridge arm, and transistor Q3 is the upper tube in the buck bridge arm, that is, transistor Q1 and transistor Q3 are transistors on the high side in the buck-boost circuit 100.

[0044] Please continue to refer to Figure 1 The driving circuit 200 includes a buck driving module 201 and a boost driving module 203. The buck driving module 201 is connected to the first auxiliary power supply 202 and the midpoint of the boost bridge arm respectively, and the boost driving module 203 is connected to the second auxiliary power supply 204 and the midpoint of the buck bridge arm respectively.

[0045] It is understandable that in Figure 1 In the embodiment, the midpoint of the boost bridge arm is the connection point between transistor Q1 and transistor Q2, and the midpoint of the buck bridge arm is the connection point between transistor Q3 and transistor Q4.

[0046] The first auxiliary power source 202 and the second auxiliary power source 204 may be current sources or voltage sources in any form. The first auxiliary power source 202 and the second auxiliary power source 204 may be the same power source or different power sources.

[0047] The potential information BOOST_SW of the midpoint of the boost bridge arm can represent the working state of the boost bridge arm. For example, if the transistor Q1 is turned on and the transistor Q2 is turned off, the potential information BOOST_SW of the midpoint of the boost bridge arm is a high level; if the transistor Q1 is turned off and the transistor Q2 is turned on, the potential information BOOST_SW of the midpoint of the boost bridge arm is a low level.

[0048] Furthermore, the buck driving module 201 can convert the voltage output by the first auxiliary power source 202 into the first output voltage in response to the potential information BOOST_SW of the midpoint of the boost bridge arm.

[0049] Optionally, the buck driving module 201 may include a voltage conversion topology, and according to the potential information BOOST_SW of the midpoint of the boost bridge arm, the voltage output by the first auxiliary power supply 202 is converted into a first output voltage through the voltage conversion topology. The buck driving module 201 may also include an energy storage element, and according to the potential information BOOST_SW of the midpoint of the boost bridge arm, the voltage output by the first auxiliary power supply 202 is converted into a first output voltage by charging and discharging the energy storage element, but the present embodiment is not limited thereto. The voltage conversion topology includes, but is not limited to, a DC converter, etc.

[0050] The first output voltage is VBOOT1, and the first output voltage VBOOT1 can provide a driving voltage for the upper tube of the buck bridge arm. Optionally, the first output voltage VBOOT1 can provide a driving voltage for the upper tube of the buck bridge arm through an optocoupler isolation driving circuit or a bootstrap circuit.

[0051] Similarly, the potential information BUCK_SW of the midpoint of the buck bridge arm can represent the working state of the buck bridge arm. For example, if the transistor Q3 is turned on and the transistor Q4 is turned off, the potential information BUCK_SW of the midpoint of the buck bridge arm is a high level; if the transistor Q3 is turned off and the transistor Q4 is turned on, the potential information BUCK_SW of the midpoint of the buck bridge arm is a low level.

[0052] Furthermore, the boost driving module 203 can convert the voltage output by the second auxiliary power supply 204 into a second output voltage in response to the potential information BUCK_SW of the midpoint of the buck bridge arm.

[0053] Also optionally, the boost driver module 203 may include a voltage conversion topology, and according to the potential information BUCK_SW of the midpoint of the buck bridge arm, the voltage output by the second auxiliary power supply 204 is converted into a second output voltage through the voltage conversion topology. The boost driver module 203 may also include an energy storage element, and according to the potential information BUCK_SW of the midpoint of the buck bridge arm, the voltage output by the second auxiliary power supply 204 is converted into a second output voltage by charging and discharging the energy storage element, but this embodiment is not limited thereto. It should be noted that the structures of the buck driver module 201 and the boost driver module 203 may be the same or different. For example, the buck driver module 201 may include a voltage conversion topology, and the boost driver module 203 may include an energy storage element.

[0054] The second output voltage is VBOOT2, and further, the second output voltage VBOOT2 provides a driving voltage for the upper tube of the boost bridge arm. Optionally, the second output voltage VBOOT2 can provide a driving voltage for the upper tube of the boost bridge arm through an optocoupler isolation driving circuit or a bootstrap circuit.

[0055] The above-mentioned driving circuit 200 applied to the buck-boost circuit includes a buck driving module 201 and a boost driving module 203. Since the buck-boost circuit 100 includes a boost bridge arm and a buck bridge arm, and the buck driving module 201 is respectively connected to the first auxiliary power supply 202 and the midpoint of the boost bridge arm, and the boost driving module 203 is respectively connected to the second auxiliary power supply 204 and the midpoint of the buck bridge arm, therefore, the buck driving module 201 can respond to the potential information of the midpoint of the boost bridge arm, and the boost driving module 203 can respond to the potential information of the midpoint of the buck bridge arm. Further, the buck driving module 201 can convert the voltage output by the first auxiliary power supply 202 into a first output voltage after responding to the potential information of the midpoint of the boost bridge arm, and the boost driving module 203 can convert the voltage output by the second auxiliary power supply 204 into a second output voltage after responding to the potential information of the midpoint of the buck bridge arm, so as to provide a driving voltage for the upper tube of the buck bridge arm through the first output voltage, and provide a driving voltage for the upper tube of the boost bridge arm through the second output voltage. In this process, there is no need to generate an isolated power supply using a transformer winding, nor is there a need for a dedicated PWM generation charge pump output by the controller, but the first output voltage and the second output voltage can provide a driving voltage for the transistor on the high side, thereby reducing the hardware cost. In addition, through the potential information of the midpoint of the buck bridge arm and the potential information of the midpoint of the boost bridge arm, it is also possible to more reliably provide a driving voltage for the transistor on the high side.

[0056] In an exemplary embodiment, optionally, the boost driving module 203 has the same structure as the buck driving module 201. Further optionally, the structures of the boost driving module 203 and the buck driving module 201 can be symmetrically arranged.

[0057] In the related art, the circuit volume and cost are large in the method of generating an isolated power supply through transformer windings. The method of generating a charge pump through PWM is easy to occupy the resources of the controller and has more circuit components. In the above embodiment, since the structure of the boost drive module 203 is the same as that of the buck drive module 201, it can not only reduce the cost, but also facilitate subsequent manufacturing and improve production efficiency.

[0058] The following mainly introduces the buck driving module 201 as an example. The principles of the boost driving module 203 and the buck driving module 201 are similar and will not be described in detail below.

[0059] Figure 2 FIG. 1 is a schematic diagram of a buck driving module in an embodiment. Figure 2 As shown, in an exemplary embodiment, optionally, the buck driving module 201 includes a first driving unit 2011 and a first bootstrap unit 2012 connected to each other; the first bootstrap unit 2012 is connected to the first auxiliary power supply 202 .

[0060] The first driving unit 2011 drives the first bootstrap unit 2012 to charge and discharge in response to the potential information of the midpoint of the boost bridge arm, so as to convert the voltage output by the first auxiliary power supply 202 into the first output voltage.

[0061] Optionally, the first driving unit 2011 may include a logic subunit, which responds to the potential information of the midpoint of the boost bridge arm and outputs a logic signal to the first bootstrap unit 2012, so as to control the logic signal to control the first bootstrap unit 2012 to charge and discharge. The logic subunit includes but is not limited to an AND gate, an OR gate, a NOT gate, etc.

[0062] For example, the logic subunit can determine whether the boost bridge arm is in a complementary conduction state based on the potential information of the midpoint in the boost bridge arm. If the boost bridge arm is in a complementary conduction state, the logic subunit outputs a high-level logic signal to the first bootstrap unit 2012, so as to control the first bootstrap unit 2012 to charge and discharge through the high-level logic signal, and convert the voltage output by the first auxiliary power supply 202 into the first output voltage. For another example, if the boost bridge arm is not in a complementary conduction state, the logic subunit can output a low-level logic signal to the first bootstrap unit 2012, so as to stop the first bootstrap unit 2012 from charging and discharging through the low-level logic signal.

[0063] In the above embodiment, since the buck driving module 201 includes the first driving unit 2011 and the first bootstrap unit 2012 which are connected to each other, and the first bootstrap unit 2012 is connected to the first auxiliary power supply 202, the first driving unit 2011 can drive the first bootstrap unit 2012 to charge and discharge in response to the potential information of the midpoint of the boost bridge arm, so as to convert the voltage output by the first auxiliary power supply 202 into the first output voltage. Without the need for complex hardware design, the driving voltage can be efficiently and reliably provided to the upper tube of the buck bridge arm through the first output voltage.

[0064] Also optionally, the boost driving module 203 includes a second driving unit and a second bootstrap unit connected to each other; the second bootstrap unit is connected to the second auxiliary power supply 204. The second driving unit drives the second bootstrap unit to charge and discharge in response to the potential information of the midpoint of the buck bridge arm, so as to convert the voltage output by the second auxiliary power supply 204 into a second output voltage.

[0065] Figure 3 Schematic diagram of a first bootstrap unit in one embodiment, Figure 3 As shown, in an exemplary embodiment, optionally, the first bootstrap unit 2012 includes a first charging subunit 2012a and a second charging subunit 2012b. The first charging subunit 2012a and the second charging subunit 2012b each include at least one energy storage element, including but not limited to a capacitor.

[0066] Among them, the first end of the first charging subunit 2012a is connected to the first auxiliary power supply 202, the first end of the second charging subunit 2012b is connected to the first end of the first charging subunit 2012a, and the second end of the second charging subunit 2012b and the second end of the first charging subunit 2012a are connected through the first driving unit 2011.

[0067] Furthermore, the first driving unit 2011 is used to be in a cut-off state when the potential information of the midpoint of the boost bridge arm is a first potential, and to control the first auxiliary power supply 202 to charge the first charging sub-unit 2012a, so that the voltage output by the first auxiliary power supply 202 is converted into a first output voltage through the discharge of the first charging sub-unit 2012a, and to be in a conducting state when the potential information of the midpoint of the boost bridge arm is a second potential, and to control the first charging sub-unit 2012a to charge the second charging sub-unit 2012b, so that the voltage output by the first auxiliary power supply 202 is converted into the first output voltage through the discharge of the second charging sub-unit 2012b.

[0068] In this embodiment, the first potential is, for example, a low level, and the second potential is, for example, a high level.

[0069] The first driving unit 2011 is used to receive the potential information BOOST_SW of the midpoint of the boost bridge arm. Exemplarily, the first driving unit 2011 may include a switching element, and the switching element includes but is not limited to a relay, a diode or an insulated gate bipolar transistor (IGBT), so that when the first driving unit 2011 receives the potential information BOOST_SW of the midpoint of the boost bridge arm as a low level, the first driving unit 2011 can be controlled to be in a cut-off state through the switching element in the first driving unit 2011, and when the potential information BOOST_SW of the midpoint of the boost bridge arm is a low level, the first driving unit 2011 can be controlled to be in a conducting state through the switching element in the first driving unit 2011.

[0070] When the first driving unit 2011 is in the cut-off state, the first auxiliary power supply 202 can be controlled to charge the first charging subunit 2012a by using the path between the first auxiliary power supply 202 and the first charging subunit 2012a. In this way, after charging the first charging subunit 2012a, the voltage across the first charging subunit 2012a is raised, and then, the voltage output by the first auxiliary power supply 202 can be converted into the first output voltage through the discharge of the first charging subunit 2012a. In this case, the first output voltage can also be understood as the discharge voltage across the first charging subunit 2012a.

[0071] When the first driving unit 2011 is in the on state, the path between the first charging subunit 2012a and the second charging subunit 2012b is also turned on. Therefore, by using the path between the first charging subunit 2012a and the second charging subunit 2012b, the first charging subunit 2012a can be controlled to charge the second charging subunit 2012b. Similarly, after charging the second charging subunit 2012b, the voltage across the second charging subunit 2012b is raised, and then, the voltage output by the first auxiliary power supply 202 can be converted into the first output voltage through the discharge of the second charging subunit 2012b. In this case, the first output voltage can also be understood as the discharge voltage across the second charging subunit 2012b.

[0072] In the above embodiment, since the first bootstrap unit 2012 includes a first charging sub-unit 2012a and a second charging sub-unit 2012b; the first end of the first charging sub-unit 2012a is connected to the first auxiliary power supply 202, the first end of the second charging sub-unit 2012b is connected to the first end of the first charging sub-unit 2012a, and the second end of the second charging sub-unit 2012b and the second end of the first charging sub-unit 2012a are connected through the first driving unit 2011, bootstrap can be achieved by charging and discharging the first charging sub-unit 2012a or the second charging sub-unit 2012b, thereby obtaining the first output voltage and the first output voltage that can provide a driving voltage for the high-side transistor in the buck-boost circuit 100.

[0073] In an exemplary embodiment, optionally, the second bootstrap unit includes a third charging subunit and a fourth charging subunit. A first end of the third charging subunit is connected to the second auxiliary power supply 204, a first end of the fourth charging subunit is connected to a first end of the third charging subunit, and a second end of the fourth charging subunit is connected to a second end of the third charging subunit via a second driving unit.

[0074] The second driving unit is used to be in a cut-off state when the potential information of the midpoint of the step-down bridge arm is a third potential, and control the second auxiliary power supply 204 to charge the third charging sub-unit, so as to convert the voltage output by the second auxiliary power supply 204 into a second output voltage through the discharge of the third charging sub-unit, and to be in a conducting state when the potential information of the midpoint of the step-down bridge arm is a fourth potential, and control the third charging sub-unit to charge the fourth charging sub-unit, so as to convert the voltage output by the second auxiliary power supply 204 into the second output voltage through the discharge of the fourth charging sub-unit.

[0075] The third potential is, for example, a low level, and the fourth potential is, for example, a high level.

[0076] Figure 4 is a schematic diagram of the first driving unit 2011 in an embodiment, as shown in Figure 4 As shown, in an exemplary embodiment, optionally, the first driving unit 2011 includes a first transistor 2011a.

[0077] Among them, the second end of the first charging subunit 2012a is connected to the emitter (Emitter, E) of the first transistor 2011a, and the second end of the second charging subunit 2012b is respectively connected to the base (Base, B) of the first transistor 2011a and the collector (Collector, C) of the first transistor 2011a, and the base of the first transistor 2011a is also used to receive the potential information of the midpoint of the boost bridge arm.

[0078] In this embodiment, since the base of the first transistor 2011a can receive the potential information BOOST_SW of the midpoint of the boost bridge arm, when the potential information BOOST_SW of the midpoint of the boost bridge arm is a first potential, the first transistor 2011a is in a cut-off state; when the potential information BOOST_SW of the midpoint of the boost bridge arm is a second potential, the first transistor 2011a is in an on state.

[0079] Since the second end of the first charging subunit 2012a is connected to the emitter of the first transistor 2011a, and the second end of the second charging subunit 2012b is respectively connected to the base of the first transistor 2011a and the collector of the first transistor 2011a, when the first transistor 2011a is in the cut-off state, the first auxiliary power supply 202 can charge the first charging subunit 2012a; when the second transistor is in the on state, the first charging subunit 2012a can charge the second charging subunit 2012b.

[0080] In the above embodiment, since the first driving unit 2011 includes the first transistor 2011a, the second end of the first charging subunit 2012a is connected to the emitter of the first transistor 2011a, the second end of the second charging subunit 2012b is respectively connected to the base of the first transistor 2011a and the collector of the first transistor 2011a, and the base of the first transistor 2011a is also used to receive the potential information of the midpoint of the boost bridge arm, therefore, the first bootstrap unit 2012 can be driven to charge and discharge in response to the potential information of the midpoint of the boost bridge arm through the first transistor 2011a, so as to convert the voltage output by the first auxiliary power supply 202 into the first output voltage.

[0081] In an exemplary embodiment, optionally, the second driving unit includes a second transistor.

[0082] Among them, the second end of the third charging subunit is connected to the emitter of the second transistor, the second end of the fourth charging subunit is connected to the base of the second transistor and the collector of the second transistor respectively, and the base of the second transistor is also used to receive the potential information of the midpoint of the boost bridge arm.

[0083] Figure 5 2 is a schematic diagram of yet another driving circuit in an embodiment. In an exemplary embodiment, optionally, the driving circuit 200 further includes a first detection module 205 and a second detection module 206 .

[0084] The first detection module 205 is disposed at the midpoint of the boost bridge arm, and is used to determine the potential information of the midpoint of the boost bridge arm, and send the potential information of the midpoint of the boost bridge arm to the buck driving module 201. Optionally, the first detection module 205 includes but is not limited to a potentiometer or a voltage sensor.

[0085] The second detection module 206 is set at the midpoint of the buck bridge arm; the second detection module 206 is used to determine the potential information of the midpoint of the buck bridge arm and send the potential information of the midpoint of the buck bridge arm to the boost driving module 203. Also optionally, the second detection module 206 includes but is not limited to a potentiometer or a voltage sensor.

[0086] It should be noted that the first detection module 205 and the second detection module 206 may be the same or different.

[0087] In the above embodiment, since the driving circuit 200 also includes a first detection module 205 and a second detection module 206, the first detection module 205 is set at the midpoint of the boost bridge arm, and the second detection module 206 is set at the midpoint of the buck bridge arm. Therefore, the potential information of the midpoint of the boost bridge arm can be efficiently determined through the first detection module 205, and the potential information of the midpoint of the buck bridge arm can be efficiently determined through the second detection module 206, so as to perform accurate voltage conversion based on the potential information later.

[0088] Figure 6 2 is a schematic diagram of yet another driving circuit in an embodiment. In an exemplary embodiment, optionally, the driving circuit 200 further includes a first driver 207 and a second driver 208 .

[0089] The buck driving module 201 is connected to the first driver 207 , and the first output voltage provides a driving voltage for the upper tube of the buck bridge arm through the first driver 207 .

[0090] The boost driving module 203 is connected to the second driver 208 , and the second output voltage provides a driving voltage for the upper tube of the boost bridge arm through the second driver 208 .

[0091] The first driver 207 and the second driver 208 can be any type of driver, which is not limited in this embodiment. The first driver 207 and the second driver 208 can be the same or different.

[0092] In the above embodiment, the driving circuit 200 also includes a first driver 207 and a second driver 208. Since the buck driving module 201 is connected to the first driver 207, the first output voltage provides a driving voltage for the upper tube of the buck bridge arm through the first driver 207, and the boost driving module 203 is connected to the second driver 208, and the second output voltage provides a driving voltage for the upper tube of the boost bridge arm through the second driver 208. Therefore, the floating ground drive of the high-side transistor in the buck-boost circuit 100 is more reliably realized through the first driver 207 and the second driver 208.

[0093] In order to more clearly describe the driving circuit 200 of the present application, Figure 7 Provide explanation. Figure 7 is a schematic diagram of yet another driving circuit in an embodiment, Figure 7 , transistor Q5 represents the first transistor 2011a, transistor Q6 represents the second transistor. Capacitor C1 represents the first charging subunit 2012a, capacitor C2 represents the second charging subunit 2012b, capacitor C3 represents the third charging subunit, and capacitor C4 represents the fourth charging subunit. Bias voltage VANS represents the first auxiliary power source 202 and the second auxiliary power source 204.

[0094] Please continue to refer to Figure 7 In an exemplary embodiment, optionally, the buck driving module 201 further includes at least one of the following:

[0095] (1) A first diode D1. The anode of the first diode D1 is connected to the first auxiliary power supply 202, and the cathode of the first diode D1 is connected to the first end of the first charging subunit 2012a. Optionally, the second diode D2 is used to prevent the bias voltage VANS from affecting the first output voltage VBOOT1.

[0096] (2) A second diode D2. The anode of the second diode D2 is connected to the first end of the first charging subunit 2012a, and the cathode of the second diode D2 is connected to the first end of the second charging subunit 2012b. Optionally, the second diode D2 is used to prevent the second charging subunit 2012b from charging the first charging subunit 2012a.

[0097] (3) A third diode D3. The anode of the third diode D3 is connected to the emitter of the first transistor 2011a, and the cathode of the third diode D3 is connected to the base of the first transistor 2011a. Optionally, the third diode D3 is used to further control the first transistor 2011a to be in a cut-off state when BOOST_SW is at a low level.

[0098] (4) Fourth diode D4. The anode of the fourth diode D4 is connected to the base of the first transistor 2011a, and the cathode of the fourth diode D4 is used to receive the potential information BOOST_SW of the midpoint of the boost bridge arm. The fourth diode D4 is used to block the influence of the second potential.

[0099] In the above embodiment, since the buck driving module 201 further includes at least one of the first diode, the second diode, the third diode and the fourth diode, the working stability and reliability of the buck driving module 201 can be further improved by the above diodes.

[0100] In an exemplary embodiment, optionally, the boost driving module 203 further includes at least one of the following: (1) a fifth diode D5, wherein the anode of the fifth diode D5 is connected to the first auxiliary power supply 202, and the cathode of the fifth diode D5 is connected to the first end of the third charging subunit. (2) a sixth diode D6, wherein the anode of the sixth diode D6 is connected to the first end of the third charging subunit, and the cathode of the sixth diode D6 is connected to the first end of the fourth charging subunit. (3) a seventh diode D7, wherein the anode of the seventh diode D7 is connected to the emitter of the second transistor, and the cathode of the seventh diode D7 is connected to the base of the second transistor. (4) an eighth diode D8, wherein the anode of the eighth diode D8 is connected to the base of the second transistor, and the cathode of the eighth diode D8 is used to receive the potential information of the midpoint of the buck bridge arm.

[0101] Please continue to refer to Figure 7 In an exemplary embodiment, optionally, the buck driving module 201 further includes at least one of a first resistor R1 and a second resistor R2.

[0102] The first resistor R1 is disposed between the first auxiliary power source 202 and the first end of the first charging subunit 2012a. The first resistor R1 can be used as a current limiting resistor.

[0103] The second resistor R2 is disposed between the base of the first transistor 2011a and the second end of the second charging subunit 2012b. The second resistor R2 can be used as a base bias resistor for the first transistor 2011a.

[0104] In the above embodiment, since the first resistor is arranged between the first auxiliary power supply 202 and the first end of the first charging subunit 2012a; the second resistor is arranged between the base of the first transistor 2011a and the second end of the second charging subunit 2012b, therefore, through at least one of the first resistor and the second resistor, the working stability and reliability of the buck driving module 201 can be further improved.

[0105] In an exemplary embodiment, optionally, the boost driving module 203 further includes at least one of a third resistor R3 and a fourth resistor R4. The third resistor R3 is disposed between the second auxiliary power supply 204 and the first end of the third charging subunit. The fourth resistor R4 is disposed between the base of the second transistor and the second end of the fourth charging subunit.

[0106] Please continue to refer to Figure 7 , the buck driving process is described below. When the input voltage VIN of the buck-boost circuit is greater than the output voltage VOUT, the buck-boost circuit is in buck mode. Transistor Q3 and transistor Q4 are complementary and turned on.

[0107] If transistor Q3 is turned off and transistor Q4 is turned on, BOOST_SW is at a low level. When BOOST_SW is at a low level, the bias voltage VBIAS charges capacitor C1 through the first resistor R1, the first diode D1, the third diode D3 and the fourth diode D4. Due to the presence of the third diode D3, the BE junction of transistor Q5 is reverse biased, so that transistor Q5 is in a cut-off state. At this time, the voltage across the second resistor R2 is approximately equal to the voltage of the BUCK_SW node. In this way, after charging capacitor C1, VBOOT1 can be raised through the discharge of capacitor C1.

[0108] If transistor Q3 is turned on and transistor Q4 is turned off, BOOST_SW is at a high level. When BOOST_SW is at a high level, the fourth diode D4 blocks the influence of the high level. The voltage across capacitor C1 causes transistor Q5 to be turned on, and then charges capacitor C2 through the second diode D2 and transistor Q5, and then raises VBOOT1 through the discharge of capacitor C2. The presence of the second diode D2 can prevent capacitor C2 from discharging to capacitor C1.

[0109] In this way, after continuous BOOST_SW switching cycles, a stable VBOOT1 can be obtained to provide a driving voltage for transistor Q3.

[0110] Please continue to refer to Figure 7 , the boost driving process is described below. When the input voltage VIN of the buck-boost circuit is less than the output voltage VOUT, the buck-boost circuit is in the boost mode, and transistors Q1 and Q2 are turned on complementary.

[0111] If transistor Q3 is turned off and transistor Q4 is turned on, BUCK_SW is at a low level. When BUCK_SW is at a low level, the bias voltage VBIAS charges capacitor C3 through the third resistor R3, the sixth diode D6, the seventh diode D7 and the eighth diode D8. Due to the presence of the seventh diode D7, the BE junction of transistor Q6 is reverse biased, so that transistor Q6 is in a cut-off state. At this time, the voltage across the fourth resistor R4 is approximately equal to the voltage of the BOOT_SW node. In this way, after charging capacitor C3, VBOOT2 can be raised through the discharge of capacitor C3.

[0112] If transistor Q3 is turned on and transistor Q4 is turned off, BUCK_SW is at a high level. When BUCK_SW is at a high level, the eighth diode D8 blocks the influence of the high level. The voltage across capacitor C3 causes transistor Q6 to be turned on, and then charges capacitor C4 through the sixth diode D6 and transistor Q5, and then raises VBOOT2 through the discharge of capacitor C4. The presence of the sixth diode D6 can prevent capacitor C2 from discharging to capacitor C1.

[0113] In this way, after continuous BUCK_SW switching cycles, a stable VBOO2 can be obtained to provide a driving voltage for the transistor Q1.

[0114] Figure 8 FIG. 1 is a schematic diagram of another driving circuit in an embodiment, Figure 8 As shown, driver U1 represents the first driver, and driver U2 represents the second driver. In driver U1 and driver U2, VCC is used to receive the working power supply VANS of the driver, and GND is the ground terminal.

[0115] In driver U1, HIN is used to receive the drive signal Boost_PWM_H for controlling transistor Q1, LIN is used to receive the drive signal Boost_PWM_L for controlling transistor Q2, HO is used to control transistor Q3, LO is used to control transistor Q4, VA is used to receive VBOOT1 to provide a drive voltage for transistor Q3, and VS is used to connect the midpoint of the buck bridge arm.

[0116] In driver U2, HIN is used to receive the drive signal Buck_PWM_H for controlling transistor Q3, LIN is used to receive the drive signal Buck_PWM_L for controlling transistor Q4, HO is used to control transistor Q1, LO is used to control transistor Q2, VA is used to receive VBOOT2 to provide a drive voltage for transistor Q1, and VS is used to connect the midpoint of the boost bridge arm.

[0117] Fig. 9Schematic diagram of an energy storage power supply in an embodiment. In an embodiment, an energy storage power supply 900 is further provided. The energy storage power supply 900 includes a buck-boost circuit 100 and any one of the above drive circuits 200.

[0118] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0119] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0120] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A driving circuit for a buck-boost circuit, wherein: The buck-boost circuit comprises a boost bridge arm and a buck bridge arm, and is characterized in that the drive circuit comprises a buck drive module and a boost drive module; the buck drive module is respectively connected to the first auxiliary power supply and the midpoint of the boost bridge arm, and the boost drive module is respectively connected to the second auxiliary power supply and the midpoint of the buck bridge arm; The buck driving module converts the voltage output by the first auxiliary power supply into a first output voltage in response to the potential information of the midpoint of the boost bridge arm, and the first output voltage provides a driving voltage for the upper tube of the buck bridge arm; The boost driving module converts the voltage output by the second auxiliary power supply into a second output voltage in response to the potential information of the midpoint of the buck bridge arm, and the second output voltage provides a driving voltage for the upper tube of the boost bridge arm.

2. The driving circuit according to claim 1, characterized in that: The boost driving module has the same structure as the buck driving module.

3. The driving circuit according to claim 2, characterized in that: The step-down driving module comprises a first driving unit and a first bootstrap unit connected to each other; the first bootstrap unit is connected to the first auxiliary power supply; The first driving unit drives the first bootstrap unit to charge and discharge in response to the potential information of the midpoint of the boost bridge arm, so as to convert the voltage output by the first auxiliary power supply into the first output voltage.

4. The driving circuit according to claim 3, characterized in that: The first bootstrap unit includes a first charging subunit and a second charging subunit; a first end of the first charging subunit is connected to the first auxiliary power supply, a first end of the second charging subunit is connected to a first end of the first charging subunit, and a second end of the second charging subunit is connected to a second end of the first charging subunit via the first driving unit; The first driving unit is used to be in a cut-off state when the potential information of the midpoint of the boost bridge arm is a first potential, and control the first auxiliary power supply to charge the first charging sub-unit, so as to convert the voltage output by the first auxiliary power supply into the first output voltage through the discharge of the first charging sub-unit, and to be in a conducting state when the potential information of the midpoint of the boost bridge arm is a second potential, and control the first charging sub-unit to charge the second charging sub-unit, so as to convert the voltage output by the first auxiliary power supply into the first output voltage through the discharge of the second charging sub-unit.

5. The driving circuit according to claim 4, characterized in that: The first driving unit includes a first transistor; the second end of the first charging subunit is connected to the emitter of the first transistor, and the second end of the second charging subunit is respectively connected to the base of the first transistor and the collector of the first transistor, and the base of the first transistor is also used to receive the potential information of the midpoint of the boost bridge arm.

6. The driving circuit according to claim 5, characterized in that: The buck driving module further includes at least one of the following: a first diode, wherein an anode of the first diode is connected to the first auxiliary power supply, and a cathode of the first diode is connected to a first end of the first charging subunit; a second diode, wherein an anode of the second diode is connected to the first end of the first charging subunit, and a cathode of the second diode is connected to the first end of the second charging subunit; a third diode, wherein an anode of the third diode is connected to the emitter of the first transistor, and a cathode of the third diode is connected to the base of the first transistor; A fourth diode, wherein the anode of the fourth diode is connected to the base of the first transistor, and the cathode of the fourth diode is used to receive the potential information of the midpoint of the boost bridge arm.

7. The driving circuit according to claim 5, characterized in that: The buck driving module further includes at least one of a first resistor and a second resistor: The first resistor is arranged between the first auxiliary power source and the first end of the first charging subunit; The second resistor is arranged between the base of the first transistor and the second end of the second charging subunit.

8. The driving circuit according to any one of claims 1 to 7, characterized in that: The driving circuit further includes a first detection module and a second detection module; the first detection module is arranged at the midpoint of the boost bridge arm, and the second detection module is arranged at the midpoint of the buck bridge arm; The first detection module is used to determine the potential information of the midpoint of the boost bridge arm, and send the potential information of the midpoint of the boost bridge arm to the buck driving module; The second detection module is used to determine the potential information of the midpoint of the buck bridge arm, and send the potential information of the midpoint of the buck bridge arm to the boost driving module.

9. The driving circuit according to any one of claims 1 to 7, characterized in that: The driving circuit also includes a first driver and a second driver; The buck driving module is connected to the first driver, and the first output voltage provides a driving voltage for the upper tube of the buck bridge arm through the first driver; The boost driving module is connected to the second driver, and the second output voltage provides a driving voltage for the upper tube of the boost bridge arm through the second driver.

10. An energy storage power supply, characterized in that: The energy storage power supply includes a buck-boost circuit and a drive circuit as described in any one of claims 1-9.

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