Inverter power supply system, power supply control method and power supply equipment

Abstract

The invention discloses an inverter power supply system, a power supply control method and power supply equipment. A low-voltage power supply; the low-voltage power supply module is connected with a low-voltage power supply and is provided with at least one stage of voltage conversion circuit; a first auxiliary source; a second auxiliary source; the control module is powered by the low-voltage power supply module and is used for outputting a first driving signal to the low-voltage side driver, controlling the inverter to boost a first power supply voltage provided by the low-voltage power supply and then outputting a bus voltage corresponding to the bus power supply, so that the first auxiliary source at least supplies power to the high-voltage side driver and the low-voltage side driver, and / or controls the inverter to output a second driving signal to the low-voltage side driver. Outputting a second driving signal to a second auxiliary source, and controlling the second auxiliary source to at least supply power to the high-voltage side driver; and after the high-voltage side driver is electrified, controlling the inverter to operate in a reverse discharge state. The power supply system can reduce components, reduce device and manufacturing cost, save product space, reduce product power consumption and improve inversion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of inverter control, and particularly to an inverter power supply system, a power supply control method, and a power supply device. Background Art

[0002] In an inverter system, a flyback power supply is usually adopted as an auxiliary power supply module to provide stable DC power supply for low-voltage parts such as a control circuit and a driving circuit.

[0003] During the working process of an inverter system adopting an LLC isolation structure, when there is high-voltage power supply in the system, the flyback power supply is in a forward power supply state, and only the power consumption generated by the flyback power supply itself is considered; when there is no high-voltage power supply in the system, a battery is needed to supply power to the low-voltage side, and at the same time, the flyback power supply is controlled to work in a reverse working state to convert the low-voltage direct current provided by the battery into high voltage (such as a high-voltage bus voltage) to supply power to the high-voltage side isolated by the LLC resonant converter. In the prior art, the transformer used in the flyback power supply is a multi-winding transformer, which has a large volume, many components, a large product space size, and a large power consumption in the reverse working state of the flyback power supply, resulting in higher manufacturing costs and usage costs of the inverter system. Summary of the Invention

[0004] The present invention provides an inverter power supply system, a power supply control method, and a power supply device to solve the problem of higher manufacturing costs and usage costs of the existing inverter power supply.

[0005] According to one aspect of the present invention, an inverter power supply system is provided. The inverter is provided with a high-voltage side switch circuit, a low-voltage side switch circuit, a resonant conversion circuit, a high-voltage side driver, and a low-voltage side driver. The power supply system includes: a bus power supply connected to the high-voltage side switch circuit; a low-voltage power supply connected to the low-voltage side switch circuit; a low-voltage power supply module connected to the low-voltage power supply and provided with at least one stage of voltage conversion circuit; a first auxiliary power supply connected to the bus power supply, the high-voltage side power supply terminal of the high-voltage side driver, and the low-voltage side power supply terminal of the low-voltage side driver respectively; a second auxiliary power supply connected to at least the high-voltage side power supply terminal and the low-voltage side power supply terminal respectively; a control module powered by the low-voltage power supply module and connected to the first auxiliary power supply, the second auxiliary power supply, the high-voltage side driver, and the low-voltage side driver respectively. The control module is configured to: output a first driving signal to the low-voltage side driver to control the inverter to boost the first power supply voltage provided by the low-voltage power supply and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power supply supplies power to at least the high-voltage side driver and the low-voltage side driver; and / or output a second driving signal to the second auxiliary power supply to control the second auxiliary power supply to supply power to at least the high-voltage side driver; the control module is further configured to: after the high-voltage side driver is powered on, control the inverter to operate in a reverse discharge state.

[0006] Optionally, the second auxiliary power supply includes: a first power supply controller, a first transformer, and a rectification component; the first power supply controller is arranged between the low-voltage side of the first transformer and the low-voltage side power supply terminal, and the control terminal of the first power supply controller is connected to the control module; the high-voltage side of the first transformer is connected to the high-voltage side power supply terminal through the rectification component; the control module is configured to: when the bus power supply is powered off and the low-voltage power supply is powered on, output the second driving signal to the first power supply controller to control the first transformer to boost the voltage of the low-voltage side power supply terminal and then supply power to the high-voltage side driver through the rectification component, and after the high-voltage side driver is powered on, output the first driving signal to the low-voltage side driver to control the inverter to boost the first power supply voltage and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power supply supplies power to the high-voltage side driver and the low-voltage side driver.

[0007] Optionally, the second auxiliary power source includes: a second power supply controller and a second transformer; the second power supply controller is disposed between the first low-voltage side of the second transformer and the low-voltage power supply, and the control terminal of the second power supply controller is connected to the control module; the second low-voltage side of the second transformer is connected to the low-voltage side power supply terminal, and the high-voltage side of the second transformer is connected to the high-voltage side power supply terminal; the control module is configured to: when the bus power supply loses power and the low-voltage power supply is powered on, output the second drive signal to the second power supply controller, control the second transformer to boost and buck the voltage of the low-voltage power supply, and then supply power to the low-voltage side driver through the second low-voltage side and supply power to the high-voltage side driver through the high-voltage side, and after the high-voltage side driver is powered on, output the first drive signal to the low-voltage side driver, control the inverter to boost the first supply voltage and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power source supplies power to the high-voltage side driver and the low-voltage side driver.

[0008] Optionally, the voltage conversion circuit includes: a first voltage conversion circuit; the input terminal of the first voltage conversion circuit is connected to the low-voltage side power supply terminal, and the output terminal of the first voltage conversion circuit is connected to the power supply terminal of the control module, and the first voltage conversion circuit is used to convert the second supply voltage of the low-voltage side power supply terminal into a third supply voltage; wherein, the voltage value of the third supply voltage is less than the voltage value of the second supply voltage.

[0009] Optionally, the voltage conversion circuit further includes: a second voltage conversion circuit; the input terminal of the second voltage conversion circuit is connected to the low-voltage power supply through a first diode, and the output terminal of the second voltage conversion circuit is connected to the input terminal of the first voltage conversion circuit through a second diode, and the second voltage conversion circuit is used to convert the first supply voltage into a fourth supply voltage; wherein, the voltage value of the fourth supply voltage is less than the voltage value of the first supply voltage, and the voltage value of the fourth supply voltage is greater than the voltage value of the second supply voltage.

[0010] Optionally, the first auxiliary power source includes: a third power supply controller and a third transformer; the third power supply controller is disposed between the first high-voltage side of the third transformer and the bus power supply, and the control terminal of the third power supply controller is connected to the control module; the second high-voltage side of the third transformer is connected to the high-voltage side power supply terminal, and the low-voltage side of the third transformer is connected to the low-voltage side power supply terminal.

[0011] Optionally, the inverter power supply system further includes: an isolation sampling circuit; a first power supply terminal of the isolation sampling circuit is connected to the high-voltage side power supply terminal, a second power supply terminal of the isolation sampling circuit is connected to the low-voltage power supply module, a sampling terminal of the isolation sampling circuit is connected to the bus power supply, and a feedback output terminal of the isolation sampling circuit is connected to the control module; the control module is further configured to: when the sampling voltage provided at the feedback output terminal meets the startup requirement of the first auxiliary power source, control the second auxiliary power source and / or the voltage conversion circuit to operate in a standby mode.

[0012] Optionally, the duty cycle of the first drive signal is less than the duty cycle of the drive signal of the low-voltage side driver when the inverter operates in the reverse discharge state.

[0013] According to another aspect of the present invention, there is provided an inverter power supply control method implemented based on the above inverter power supply system. The inverter is provided with a high-voltage side driver and a low-voltage side driver. The power supply system includes: a bus power supply, a low-voltage power supply, a first auxiliary power source, and a second auxiliary power source; the method includes: outputting a first drive signal to the low-voltage side driver to control the inverter to boost the first power supply voltage provided by the low-voltage power supply and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power source supplies power to at least the high-voltage side driver and the low-voltage side driver; and / or, outputting a second drive signal to the second auxiliary power source to control the second auxiliary power source to supply power to at least the high-voltage side driver; and after the high-voltage side driver is powered on, controlling the inverter to operate in the reverse discharge state.

[0014] According to another aspect of the present invention, there is provided a power supply device including: the above inverter power supply system.

[0015] The technical solution of the embodiment of the present invention provides a bus power supply, a low-voltage power supply, a low-voltage power supply module, a first auxiliary power source, and a second auxiliary power source. The second auxiliary power source is connected to at least the high-voltage side power supply terminal of the high-voltage side driver and the low-voltage side power supply terminal of the low-voltage side driver respectively, forming a low-voltage miniaturized power supply structure; the control module is connected to the first auxiliary power source, the second auxiliary power source, the high-voltage side driver, and the low-voltage side driver respectively, and is used to control the inverter to work in reverse or control the second auxiliary power source to output high-voltage side power supply, and after the high-voltage side driver resumes power supply, use the inverter to output a stable bus voltage to maintain the stable operation of the first auxiliary power source, solving the problem that the existing inverter power supply has a high manufacturing cost and usage cost, being able to reduce components, lower device and manufacturing costs, save product space, reduce product power consumption, and improve inverter efficiency.

[0016] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of a topology structure of an inverter provided by an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of a structure of an inverter power supply system provided by an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of a structure of another inverter power supply system provided by an embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of a topology structure of a low-voltage power supply module provided by an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of a topology structure of a second auxiliary power source provided by an embodiment of the present invention;

[0023] Figure 6 It is a schematic diagram of a topology structure of another second auxiliary power source provided by an embodiment of the present invention;

[0024] Figure 7 It is a schematic diagram of a topology structure of a first auxiliary power source provided by an embodiment of the present invention;

[0025] Figure 8 It is a flowchart of a method for controlling an inverter power supply provided by an embodiment of the present invention;

[0026] Figure 9 It is a flowchart of another method for controlling an inverter power supply provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] Figure 1 It is a schematic diagram of a topological structure of an inverter provided by an embodiment of the present invention. Figure 2 It is a schematic diagram of a structure of an inverter power supply system provided by an embodiment of the present invention. This embodiment is applicable to an inverter application scenario with a demand for bidirectional voltage conversion processing.

[0030] The inverter of this application is a bidirectional inverter. Refer to Figure 1 As shown, the inverter 01 is provided with a high-voltage side switch circuit 1, a low-voltage side switch circuit 2, a resonant conversion circuit 3, a high-voltage side driver 4, a low-voltage side driver 5 and an inverter output module 6. The resonant conversion circuit 3 includes a main transformer T0, a resonant capacitor C0 and a resonant inductor L0. The high-voltage side switch circuit 1, the low-voltage side switch circuit 2 and the resonant conversion circuit 3 form the main channel of the inverter. This main channel can operate in a forward charging state or a reverse discharging state. In the forward charging state, the main channel steps down the high-voltage side supply voltage (i.e., the bus voltage H_VBUS) and charges the low-voltage power supply; in the reverse discharging state, the main channel steps up the low-voltage side supply voltage (i.e., the supply voltage L_BAT+ provided by the low-voltage power supply), and then supplies power to the high-voltage side load through the inverter output module 6. The high-voltage side driver 4 is provided with a high-voltage side power supply terminal and a high-voltage side ground terminal. The power supply voltage of the high-voltage side power supply terminal can be defined as H_VCC, and the high-voltage side ground terminal is connected to HGND; the low-voltage side driver 5 is provided with a low-voltage side power supply terminal and a low-voltage side ground terminal. The power supply voltage of the low-voltage side power supply terminal can be defined as L_VCC, and the low-voltage side ground terminal is connected to LGND. The high-voltage side switch circuit 1 adopts a bridge circuit structure composed of switching tubes Q3, Q4, Q5 and Q6. The high-voltage side driver 4 realizes inverter control by controlling the on and off of the switching tubes Q3, Q4, Q5 and Q6; the low-voltage side switch circuit 2 adopts a bridge circuit structure composed of switching tubes Q1, Q2, Q7 and Q8. The low-voltage side driver 5 realizes inverter control by controlling the on and off of the switching tubes Q1, Q2, Q7 and Q8; among them, body diodes are connected in parallel with the switching tubes Q1, Q2, Q3, Q4, Q5, Q6, Q7 and Q8.

[0031] See Figure 2 As shown, the inverter power supply system of the present application includes: a bus power supply 100, a low-voltage power supply 200, a low-voltage power supply module 300, a first auxiliary power supply 400, a second auxiliary power supply 500, and a control module 600. In this embodiment, the control module 600 can be a control chip (such as a single-chip microcomputer chip) powered by the low-voltage power supply module 300.

[0032] Among them, the bus power supply 100 is connected to the high-voltage side switch circuit 1 of the inverter. In this embodiment, the bus power supply 100 is used to output a bus voltage H_VBUS, and this bus voltage H_VBUS can be understood as the high-voltage side power supply voltage H_VBUS between the high-voltage side switch circuit 1 and the inverter output module 6.

[0033] The low-voltage power supply 200 is connected to the low-voltage side switch circuit of the inverter. In this embodiment, the low-voltage power supply 200 can be a storage battery or a photovoltaic power supply. The low-voltage power supply 200 is used to supply power to the low-voltage load of the inverter. Typically, the first supply voltage L_BAT+ output by the low-voltage power supply 200 can be a DC +12V voltage. The low-voltage load can be a load with a supply voltage lower than the first supply voltage (such as a DC +12V voltage).

[0034] The low-voltage power supply module 300 is connected to the low-voltage power supply 200 and is provided with at least one stage of voltage conversion circuit. In this embodiment, the voltage conversion circuit can be a BUCK step-down circuit. Multiple voltage conversion circuits are connected in cascade to output supply voltages of different voltage levels. For example, the low-voltage power supply module 300 can perform a first step-down process on the first supply voltage L_BAT+ to output the supply voltage L_VCC of the low-voltage side driver 5; and perform a second step-down process on the supply voltage L_VCC of the low-voltage side driver 5 to output the supply voltage of the control module 600, such as a DC +3.3V voltage.

[0035] The first auxiliary power supply 400 is respectively connected to the bus power supply 100, the high-voltage side power supply terminal of the high-voltage side driver 4, and the low-voltage side power supply terminal of the low-voltage side driver 5. In this embodiment, the first auxiliary power supply 400 adopts a forward isolation power supply structure, and this forward isolation power supply structure only operates in the step-down mode to convert the bus voltage into other supply voltages. Specifically, when the bus power supply 100 has no power, the first auxiliary power supply 400 does not work; when the voltage of the bus power supply 100 reaches the bus voltage H_VBUS, the first auxiliary power supply 400 starts to work, performs a step-down process on the bus voltage H_VBUS, and outputs the supply voltage L_VCC of the low-voltage side driver 5 and the supply voltage H_VCC of the high-voltage side driver 4.

[0036] The second auxiliary power source 500 is connected to at least the high-voltage side power supply terminal of the high-voltage side driver 4 and the low-voltage side power supply terminal of the low-voltage side driver 5 respectively. In this embodiment, the second auxiliary power source 500 adopts a reverse isolation power supply structure, which can operate in boost and buck modes, and can convert the first power supply voltage L_BAT+ provided by the low-voltage power supply 200 into a high-voltage side power supply voltage, or convert the low-voltage power (such as the power supply voltage L_VCC of the low-voltage side driver 5) provided by the low-voltage power supply module 300 into a high-voltage side power supply voltage.

[0037] The control module 600 is connected to the first auxiliary power source 400, the second auxiliary power source 500, the high-voltage side driver 4 and the low-voltage side driver 5 respectively. The control module 600 is used for: outputting a first driving signal PWM1 to the low-voltage side driver 5 to control the main channel of the inverter 01 to operate in a reverse discharge state, boosting the first power supply voltage L_BAT+ provided by the low-voltage power supply 200 and then outputting the bus voltage corresponding to the bus power supply 100, so that the first auxiliary power source 400 supplies power to at least the high-voltage side driver 4 and the low-voltage side driver 5; and / or, outputting a second driving signal PWM2 to the second auxiliary power source 500 to control the second auxiliary power source 500 to supply power to at least the high-voltage side driver 4; The control module 600 is further used for: after the high-voltage side driver 4 is powered on, controlling the inverter 01 to operate in a reverse discharge state.

[0038] Specifically, when the inverter 01 is powered on, the low-voltage power supply 200 is powered on and the bus power supply 100 is not powered on. The low-voltage power supply module 300 converts the first power supply voltage L_BAT+ provided by the low-voltage power supply 200 into multiple power supply voltages with different voltage levels, and supplies power to low-voltage loads such as the low-voltage side driver 5, the control module 600, the low-voltage side switch circuit 2 and the low-voltage side driver 5 respectively.

[0039] Furthermore, the control module 600 preferentially controls the main channel of the inverter 01 to perform a boost conversion process on the first power supply voltage L_BAT+ provided by the low-voltage power supply 200, and triggers the first auxiliary power source 400 to output high-voltage side power supply based on the boosted bus voltage; or, preferentially controls the second auxiliary power source 500 to convert the first power supply voltage L_BAT+ provided by the low-voltage power supply 200 or the low-voltage power (such as the power supply voltage L_VCC of the low-voltage side driver 5) provided by the low-voltage power supply module 300 into a high-voltage side power supply voltage to achieve high-voltage side power supply. After the high-voltage side driver 4 is powered on, the control module 600 also outputs driving signals to the high-voltage side driver 4 and the low-voltage side driver 5 to control the inverter 01 to operate in a reverse discharge state to output a stable bus voltage. Furthermore, through the buck processing of the first auxiliary power source 400, stable power supply for the high and low voltage sides is achieved.

[0040] In the power supply strategy with the inverter 01 having priority, the control module 600 preferentially outputs a first driving signal PWM1 to the low-voltage side driver 5, controls the on / off of the switching transistors Q1, Q2, Q7, and Q8 to achieve inverter control, boosts the first power supply voltage L_BAT+ provided by the low-voltage power supply 200 through the main transformer T0, and then rectifies the bus voltage H_VBUS through the circuit composed of the switching transistors Q3, Q4, Q5, and Q6. After obtaining the bus voltage H_VBUS, the control module 600 controls the first auxiliary power supply 400 to start working, converts the bus voltage H_VBUS into other power supply voltages (such as the power supply voltage L_VCC of the low-voltage side driver 5 and the power supply voltage H_VCC of the high-voltage side driver 4), and supplies power to the high-voltage side driver 4 and the low-voltage side driver 5.

[0041] In the power supply strategy with the second auxiliary power supply 500 having priority, the control module 600 preferentially outputs a second driving signal PWM2 to the second auxiliary power supply 500, controls the second auxiliary power supply 500 to convert the first power supply voltage L_BAT+ provided by the low-voltage power supply 200 or the low-voltage power (such as the power supply voltage L_VCC of the low-voltage side driver 5) provided by the low-voltage power supply module 300 into a high-voltage side power supply voltage (such as the power supply voltage H_VCC of the high-voltage side driver 4), and supplies power to the low-voltage load in combination with the low-voltage power supply module 300 or the first auxiliary power supply 400.

[0042] Thus, the technical solution of the present application provides power to the high-voltage side driver by using the second auxiliary power supply with a miniaturized structure or outputting the high-voltage side power supply by using the main channel devices of the inverter; and after the high-voltage side driver resumes power supply, the inverter outputs a stable bus voltage to maintain the stable operation of the first auxiliary power supply, realizing normal power supply for the high and low voltage sides, solving the problem of the high manufacturing cost and usage cost of the existing inverter power supply, being able to reduce components to lower the device and manufacturing costs, save the space of the product, reduce the power consumption of the product, and improve the inverter efficiency.

[0043] Optionally, the duty cycle of the first driving signal PWM1 is less than the duty cycle of the driving signal of the low-voltage side driver when the inverter 01 operates in the reverse discharge state. When the inverter 01 is powered on, by outputting a driving signal with a small duty cycle, the low-voltage side switching circuit 2 is controlled to work, and boost conversion is achieved in combination with the devices of the main channel of the inverter 01, which can reduce the number of components in the power supply system and lower the usage and manufacturing costs.

[0044] Figure 3 This is a schematic structural diagram of another inverter power supply system provided by an embodiment of the present invention. Refer to Figure 3As shown in the figure, the inverter power supply system of the present application further includes: an isolation sampling circuit 700; a first power supply terminal of the isolation sampling circuit 700 is connected to the high-voltage side power supply terminal, a second power supply terminal of the isolation sampling circuit 700 is connected to the low-voltage power supply module, a sampling terminal of the isolation sampling circuit 700 is connected to the bus power supply 100, and a feedback output terminal of the isolation sampling circuit 700 is connected to the control module 600. The control module 600 is further configured to: when the sampling voltage provided at the feedback output terminal meets the startup requirement of the first auxiliary power supply 400, control the second auxiliary power supply 500 and / or the voltage conversion circuit to operate in the standby mode.

[0045] Specifically, after obtaining the bus voltage H_VBUS, the isolation sampling circuit 700 samples the bus voltage H_VBUS in real time, and after analog-to-digital conversion, it is transmitted to the control module 600. The control module 600 adjusts the duty cycle of the drive signals output to the high-voltage side driver 4 and the low-voltage side driver 5 according to the sampled voltage of the bus voltage H_VBUS, so as to obtain a stable bus voltage H_VBUS. The control module 600 also determines whether the sampling voltage provided at the feedback output terminal meets the startup requirement of the first auxiliary power supply 400. When the sampling voltage meets the startup requirement of the first auxiliary power supply 400, the control module 600 stops the drive signal output to the second auxiliary power supply 500, so that the second auxiliary power supply 500 operates in the standby mode. After the stable bus voltage H_VBUS is obtained, the connection between the low-voltage power supply module 300 and the low-voltage power supply 200 is cut off, and the power supply is provided by the first auxiliary power supply 400. By collecting the high-voltage bus voltage through the isolation sampling circuit, closed-loop control is realized to ensure the power supply stability of the bus power supply.

[0046] Figure 4 It is a schematic diagram of the topology structure of a low-voltage power supply module provided by an embodiment of the present invention. Refer to Figure 4 As shown in the figure, the voltage conversion circuit of the present application includes: a first voltage conversion circuit 301; an input terminal of the first voltage conversion circuit 301 is connected to the low-voltage side power supply terminal, an output terminal of the first voltage conversion circuit 301 is connected to the power supply terminal of the control module 600, and the first voltage conversion circuit 301 is used to convert the second supply voltage L_VCC at the low-voltage side power supply terminal into a third supply voltage L_3V3; wherein, the voltage value of the third supply voltage L_3V3 is less than the voltage value of the second supply voltage L_VCC.

[0047] Refer to Figure 4As shown, the voltage conversion circuit of the present application further includes: a second voltage conversion circuit 302; the input end of the second voltage conversion circuit 302 is connected to the low-voltage power supply 200 through a first diode D1, and the output end of the second voltage conversion circuit 302 is connected to the input end of the first voltage conversion circuit 301 through a second diode D2. The second voltage conversion circuit 302 is used to convert the first supply voltage into a fourth supply voltage L_11V; wherein, the voltage value of the fourth supply voltage L_11V is less than the voltage value of the first supply voltage L_BAT+, and the voltage value of the fourth supply voltage L_11V is greater than the second supply voltage L_VCC.

[0048] See Figure 4 As shown, filter capacitors are respectively arranged at the output end of the second voltage conversion circuit 302 and the output end of the first voltage conversion circuit 301 to improve the stability of the output voltage and improve the power supply quality.

[0049] Specifically, see Figure 4 As shown, the second voltage conversion circuit 302 is also provided with an enable terminal. When the second voltage conversion circuit 30 receives an enable signal EN and the low-voltage power supply 200 is powered on, the second voltage conversion circuit 302 steps down the first supply voltage L_BAT+ provided by the low-voltage power supply 200 to obtain a fourth supply voltage L_11V. After the voltage drop of the second diode D2, the second supply voltage L_VCC is obtained to supply power to the low-voltage side driver 5; the first voltage conversion circuit 301 also converts the second supply voltage L_VCC at the low-voltage side power supply terminal into a third supply voltage L_3V3 to supply power to the control module 600. By setting a multi-stage step-down conversion circuit, low-voltage loads with different voltage levels are powered.

[0050] Figure 5 It is a schematic diagram of a topological structure of a second auxiliary power source provided by an embodiment of the present invention. See Figures 1 to 5As shown in the figure, the second auxiliary power source 500 includes: a first power supply controller IC1, a first transformer T1, and a rectification component 510. Among them, the rectification component 510 includes diodes D10, D11, D13, and D14, and the diodes D10, D11, D13, and D14 form a bridge rectifier circuit. The first power supply controller IC1 is arranged between the low-voltage side of the first transformer T1 and the low-voltage side power supply terminal of the low-voltage side driver 5. The control terminal of the first power supply controller IC1 is connected to the control module 600 to receive the second driving signal PWM2 output by the control module 600; the high-voltage side of the first transformer T1 is connected to the high-voltage side power supply terminal of the high-voltage side driver 4 through the rectification component 510; the control module 600 is configured to: when the bus power supply 100 loses power and the low-voltage power supply 200 is powered on, output a second driving signal to the first power supply controller IC1, control the first transformer T1 to boost the voltage L_VCC of the low-voltage side power supply terminal of the low-voltage side driver 5, and then output the voltage H_VCC to the high-voltage side power supply terminal of the high-voltage side driver 4 through the rectification component, and after the high-voltage side driver 4 is powered on, output a first driving signal PWM1 to the low-voltage side driver 5, control the inverter 01 to boost the first supply voltage L_BAT+ and then output the bus voltage H_VBUS corresponding to the bus power supply 100, so that the first auxiliary power source 400 supplies power to the high-voltage side driver 4 and the low-voltage side driver 5.

[0051] See Figure 5 As shown in the figure, the second auxiliary power source 500 further includes an anti-reverse connection diode D15 and a filter capacitor EC12. The anti-reverse connection diode D15 is used to prevent the high-voltage side of the second auxiliary power source 500 from charging the low-voltage side reversely; the filter capacitor EC12 is used to filter the output voltage of the rectification component 510 (i.e., the supply voltage H_VCC of the high-voltage side power supply terminal), so that the high-voltage side power supply terminal obtains a stable supply voltage.

[0052] Specifically, when the bus power supply 100 loses power and the low-voltage power supply 200 is powered on, the control module 600 outputs a second drive signal PWM2 to the first power controller IC1, causing the first power controller IC1 to start working. The supply voltage L_VCC at the low-voltage side power supply terminal of the low-voltage side driver 5 is converted into a voltage H_VCC through a bridge rectifier circuit composed of the first transformer T1 and diodes D10, D11, D13, and D14 to supply power to the high-voltage side driver 4 and at the same time supply power to the first power supply terminal of the isolation sampling circuit 700. After the high-voltage side driver 4 is powered on, the control module 600 outputs a first drive signal PWM1 to the low-voltage side driver 5, controls the on / off of the switching transistors Q1, Q2, Q7, and Q8 to achieve inverter control, boosts the first supply voltage L_BAT+ provided by the low-voltage power supply 200 through the main transformer T0, and then rectifies the circuit composed of the switching transistors Q3, Q4, Q5, and Q6 to obtain the bus voltage H_VBUS. The isolation sampling circuit 700 continuously samples the bus voltage H_VBUS, transmits it to the control module 600 after analog-to-digital conversion, and the control module 600 adjusts the duty cycle of the drive signals output to the high-voltage side driver 4 and the low-voltage side driver 5 according to the sampled voltage, so as to obtain a stable bus voltage H_VBUS. Then, power is supplied by the first auxiliary power supply 400. When the sampled voltage meets the startup requirements of the first auxiliary power supply 400, the control module 600 stops outputting the drive signal to the first power controller IC1, causing the first power controller IC1 to operate in the standby mode, which can reduce the system power consumption.

[0053] Figure 6 FIG. is a schematic diagram of another topology structure of the second auxiliary power supply provided by an embodiment of the present invention. Refer to Figure 6 As shown, the second auxiliary power supply 500 of the present application includes: a second power controller IC2 and a second transformer T2; the second power controller IC2 is disposed between the first low-voltage side of the second transformer T2 and the low-voltage power supply 200, and the control terminal of the second power controller IC2 is connected to the control module 600; the second low-voltage side of the second transformer T2 is connected to the low-voltage side power supply terminal, and the high-voltage side of the second transformer T2 is connected to the high-voltage side power supply terminal; the control module 600 is configured to: when the bus power supply 100 loses power and the low-voltage power supply 200 is powered on, output a second drive signal to the second power controller IC2, control the second transformer T2 to perform step-up and step-down processing on the voltage of the low-voltage power supply 200, supply power to the low-voltage side driver through the second low-voltage side, supply power to the high-voltage side driver through the high-voltage side, and after the high-voltage side driver is powered on, output a first drive signal to the low-voltage side driver, control the inverter to boost the first supply voltage and then output the bus voltage corresponding to the bus power supply 100, so that the first auxiliary power supply 400 supplies power to the high-voltage side driver 4 and the low-voltage side driver 5.

[0054] Refer to Figure 6As shown, a filter capacitor EC21 is also provided between the second power supply controller IC2 and the low-voltage power supply 200, which is used to filter the first supply voltage provided by the low-voltage power supply 200; a filter capacitor EC22 and a diode D21 are provided between the second low-voltage side of the second transformer T2 and the low-voltage side power supply terminal, which are used to filter the output supply voltage L_VCC and prevent reverse connection; a filter capacitor EC23 and a diode D22 are provided between the high-voltage side of the second transformer T2 and the high-voltage side power supply terminal, which are used to filter the output supply voltage H_VCC and prevent reverse connection.

[0055] Specifically, when the bus power supply 100 loses power and the low-voltage power supply 200 is powered on, the control module 600 outputs a second drive signal PWM2 to the second power supply controller IC2, causing the second power supply controller IC2 to start working, and converting the first supply voltage L_BAT+ provided by the low-voltage power supply 200 into the voltage H_VCC through the second transformer T2 to supply power to the high-voltage side driver 4, and at the same time supply power to the first power supply terminal of the isolation sampling circuit 700. After the high-voltage side driver 4 is powered on, the control module 600 outputs a first drive signal PWM1 to the low-voltage side driver 5, controls the on and off of the switching transistors Q1, Q2, Q7, and Q8 to achieve inverter control, boosts the first supply voltage L_BAT+ provided by the low-voltage power supply 200 through the main transformer T0, and then rectifies the circuit composed of the switching transistors Q3, Q4, Q5, and Q6 to obtain the bus voltage H_VBUS. The isolation sampling circuit 700 continuously samples the bus voltage H_VBUS, transmits it to the control module 600 after analog-to-digital conversion, and the control module 600 adjusts the duty cycle of the drive signals output to the high-voltage side driver 4 and the low-voltage side driver 5 according to the sampled voltage, so as to obtain a stable bus voltage H_VBUS, and then the first auxiliary power supply 400 provides power. When the sampled voltage meets the startup requirements of the first auxiliary power supply 400, the control module 600 stops outputting the drive signal to the second power supply controller IC2, causing the second power supply controller IC2 to operate in the standby mode, which can reduce the system power consumption.

[0056] In some other possible embodiments, the second transformer T2 may also adopt a transformer with two sets of high-voltage side windings. Among them, the first high-voltage side is connected to the high-voltage side power supply terminal and is used to output the power supply voltage H_VCC to supply power to the high-voltage side driver; the second high-voltage side is connected to the bus power supply 100 and is used to output the bus voltage H_VBUS corresponding to the bus power supply 100. Specifically, when the bus power supply 100 loses power and the low-voltage power supply 200 is powered on, the control module 600 outputs a second drive signal PWM2 to the second power supply controller IC2, causing the second power supply controller IC2 to start working, converting the first power supply voltage L_BAT+ provided by the low-voltage power supply 200 into the voltage H_VCC and the voltage L_VCC through the second transformer T2. The voltage H_VCC supplies power to the high-voltage side driver 4 and simultaneously supplies power to the first power supply terminal of the isolation sampling circuit 700. The voltage L_VCC supplies power to the low-voltage side driver 5 and simultaneously supplies power to the control module 600 through the first voltage conversion circuit 301. The control module 600 outputs drive signals to the high-voltage side driver 4 and the low-voltage side driver 5 respectively, controlling the inverter 01 to operate in the reverse discharge state to output a stable bus voltage. At the same time, the isolation sampling circuit 700 real-time collects the bus voltage H_VBUS, and after analog-to-digital conversion, it is transmitted to the control module 600 to achieve closed-loop control in the reverse direction state of the main channel.

[0057] It should be understood that the more windings the transformer has, the higher the usage cost of the device and the larger the product usage space. Those skilled in the art can adjust the transformer structure according to actual needs.

[0058] Figure 7 It is a schematic diagram of a topological structure of a first auxiliary power source provided by an embodiment of the present invention. Refer to Figure 7 As shown, the first auxiliary power source 400 of the present application includes: a third power supply controller IC3 and a third transformer; the third power supply controller IC3 is arranged between the first high-voltage side of the third transformer T3 and the bus power supply 100, and the control end of the third power supply controller IC3 is connected to the control module 600; the second high-voltage side of the third transformer T3 is connected to the high-voltage side power supply terminal, and the low-voltage side of the third transformer T3 is connected to the low-voltage side power supply terminal.

[0059] Specifically, the bus voltage H_VBUS provided by the bus power supply 100 is stepped down by the third transformer T3 to obtain the voltage H_VCC to supply power to the high-voltage side driver 4, and at the same time, the voltage L_VCC is obtained to supply power to the low-voltage side driver 5. The voltage L_VCC can also be stepped down by the first voltage conversion circuit 301 to supply power to the control module 600. Furthermore, the control module 600 outputs drive signals to the high-voltage side driver 4 and the low-voltage side driver 5 respectively, controls the inverter 01 to operate in the reverse discharge state, and outputs the bus voltage H_VBUS. At the same time, the isolation sampling circuit 700 feeds back the sampled voltage of the bus voltage H_VBUS to the control module 600 to achieve closed-loop control, so as to output a stable bus voltage H_VBUS, which can improve the power supply quality of the high- and low-voltage side loads. Refer to Figure 7 As shown, a diode D32 and a filter capacitor EC6 are provided between the second high-voltage side of the third transformer T3 and the high-voltage side power supply terminal, a diode D31 and a filter capacitor EC4 are provided between the low-voltage side of the third transformer T3 and the low-voltage side power supply terminal, and a filter capacitor EC5 is provided on the first high-voltage side of the third transformer T3 to further improve the power supply quality and prevent the reverse flow of electric energy.

[0060] Based on the same inventive concept as the above embodiments, the embodiment of the present invention further provides an inverter power supply control method, which is implemented based on the inverter power supply system provided in any of the above embodiments and can execute the corresponding control strategy of the inverter power supply system. In this embodiment, the inverter is provided with a high-voltage side driver and a low-voltage side driver, and the power supply system includes: a bus power supply, a low-voltage power supply, a first auxiliary power supply, and a second auxiliary power supply. The inverter power supply control method of the present application includes: outputting a first drive signal to the low-voltage side driver to control the inverter to boost the first power supply voltage provided by the low-voltage power supply and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power supply supplies power to at least the high-voltage side driver and the low-voltage side driver; and / or outputting a second drive signal to the second auxiliary power supply to control the second auxiliary power supply to supply power to at least the high-voltage side driver; and after the high-voltage side driver is powered on, controlling the inverter to operate in the reverse discharge state.

[0061] Specifically, when the inverter is powered on, the second auxiliary power supply can be preferentially controlled to supply power to the high-voltage side driver, and then the first auxiliary power supply is controlled to operate in the forward working state to output power to the high-voltage side driver and the low-voltage side driver; or, the inverter is preferentially controlled to boost the first power supply voltage provided by the low-voltage power supply and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power supply operates in the forward working state to output power to the high-voltage side driver and the low-voltage side driver.

[0062] Exemplarily, Figure 8 is a flowchart of an inverter power supply control method provided by an embodiment of the present invention. As Figure 8 shown, the inverter power supply control method includes:

[0063] S101: Output a first driving signal to the low-voltage side driver, control the inverter to boost the first power supply voltage provided by the low-voltage power supply and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power supply operates in the forward working state and supplies power to the high-voltage side driver and the low-voltage side driver.

[0064] S102: Control the inverter to operate in the reverse discharge state.

[0065] Exemplarily, Figure 9 is a flowchart of another inverter power supply control method provided by an embodiment of the present invention. In the Figure 9 illustrated embodiment, control the second auxiliary power supply to start preferentially. As Figure 9 shown, the inverter power supply control method of the present application includes:

[0066] S201: Output a second driving signal to the second auxiliary power supply, and control the second auxiliary power supply to supply power to at least the high-voltage side driver.

[0067] S202: Output a first driving signal to the low-voltage side driver, control the inverter to boost the first power supply voltage provided by the low-voltage power supply and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary power supply operates in the forward working state and supplies power to the high-voltage side driver and the low-voltage side driver.

[0068] S203: Control the inverter to operate in the reverse discharge state.

[0069] In some exemplary embodiments, the inverter power supply control method of the present application further includes: outputting a second driving signal to the second auxiliary power supply, controlling the second auxiliary power supply to perform boosting and bucking processing, supplying power to the high-voltage side driver, and outputting the bus voltage corresponding to the bus power supply.

[0070] Based on the above embodiments, an embodiment of the present invention further provides a power supply device, including the inverter power supply system provided in any of the above embodiments, having the functional modules and beneficial effects of the inverter power supply system, and the same parts will not be described in detail. In the present application, the power supply device includes, but is not limited to: a switching power supply and a portable power supply with a bidirectional inversion function.

[0071] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0072] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An inverter power supply system, characterized in that: The inverter is provided with a high-voltage side switch circuit, a low-voltage side switch circuit, a resonant conversion circuit, a high-voltage side driver and a low-voltage side driver, and the power supply system comprises: A bus power supply connected to the high-voltage side switch circuit; A low-voltage power supply connected to the low-voltage side switch circuit; A low-voltage power supply module, connected to the low-voltage power supply and provided with at least one level of voltage conversion circuit; A first auxiliary source is connected to the bus power supply, the high-voltage side power supply end of the high-voltage side driver, and the low-voltage side power supply end of the low-voltage side driver respectively; A second auxiliary source is connected to at least the high-voltage side power supply end and the low-voltage side power supply end respectively; A control module, powered by the low-voltage power supply module, and connected to the first auxiliary source, the second auxiliary source, the high-voltage side driver and the low-voltage side driver respectively, the control module is used to: output a first drive signal to the low-voltage side driver, control the inverter to boost the first power supply voltage provided by the low-voltage power supply and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary source at least supplies power to the high-voltage side driver and the low-voltage side driver; and / or, output a second drive signal to the second auxiliary source, control the second auxiliary source to at least supply power to the high-voltage side driver; The control module is also used to control the inverter to operate in a reverse discharge state after the high-voltage side driver is powered.

2. The inverter power supply system according to claim 1, characterized in that: The second auxiliary source includes: a first power controller, a first transformer and a rectifier component; The first power supply controller is arranged between the low voltage side of the first transformer and the low voltage side power supply end, and the control end of the first power supply controller is connected to the control module; The high voltage side of the first transformer is connected to the high voltage side power supply terminal via the rectifier assembly; The control module is configured to: when the bus power supply loses power and the low-voltage power supply has power, output the second drive signal to the first power supply controller, control the first transformer to boost the voltage of the low-voltage side power supply end, and then power the high-voltage side driver through the rectifier component; and after the high-voltage side driver is powered, output the first drive signal to the low-voltage side driver, control the inverter to boost the first supply voltage and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary source powers the high-voltage side driver and the low-voltage side driver.

3. The inverter power supply system according to claim 1, characterized in that: The second auxiliary source includes: a second power supply controller and a second transformer; The second power supply controller is arranged between the first low-voltage side of the second transformer and the low-voltage power supply, and the control end of the second power supply controller is connected to the control module; The second low-voltage side of the second transformer is connected to the low-voltage side power supply terminal, and the high-voltage side of the second transformer is connected to the high-voltage side power supply terminal; The control module is configured to: when the bus power supply loses power and the low-voltage power supply has power, output the second drive signal to the second power supply controller, control the second transformer to step up and step down the voltage of the low-voltage power supply, and then supply power to the low-voltage side driver through the second low-voltage side, and supply power to the high-voltage side driver through the high-voltage side, and after the high-voltage side driver is powered, output the first drive signal to the low-voltage side driver, control the inverter to step up the first supply voltage and then output the bus voltage corresponding to the bus power supply, so that the first auxiliary source supplies power to the high-voltage side driver and the low-voltage side driver.

4. The inverter power supply system according to claim 1, characterized in that: The voltage conversion circuit comprises: a first voltage conversion circuit; The input end of the first voltage conversion circuit is connected to the low-voltage side power supply end, the output end of the first voltage conversion circuit is connected to the power supply end of the control module, and the first voltage conversion circuit is used to convert the second power supply voltage of the low-voltage side power supply end into a third power supply voltage; Wherein, a voltage value of the third supply voltage is smaller than a voltage value of the second supply voltage.

5. The inverter power supply system according to claim 4, characterized in that: The voltage conversion circuit further includes: a second voltage conversion circuit; The input end of the second voltage conversion circuit is connected to the low voltage power supply via a first diode, the output end of the second voltage conversion circuit is connected to the input end of the first voltage conversion circuit via a second diode, and the second voltage conversion circuit is used to convert the first supply voltage into a fourth supply voltage; The voltage value of the fourth power supply voltage is smaller than the voltage value of the first power supply voltage, and the voltage value of the fourth power supply voltage is larger than the voltage value of the second power supply voltage.

6. The inverter power supply system according to claim 1, characterized in that: The first auxiliary source includes: a third power controller and a third transformer; The third power supply controller is arranged between the first high voltage side of the third transformer and the bus power supply, and the control end of the third power supply controller is connected to the control module; The second high-voltage side of the third transformer is connected to the high-voltage side power supply end, and the low-voltage side of the third transformer is connected to the low-voltage side power supply end.

7. The inverter power supply system according to any one of claims 1 to 6, characterized in that: Also includes: Isolation sampling circuit; The first power supply end of the isolated sampling circuit is connected to the high-voltage side power supply end, the second power supply end of the isolated sampling circuit is connected to the low-voltage power supply module, the sampling end of the isolated sampling circuit is connected to the bus power supply, and the feedback output end of the isolated sampling circuit is connected to the control module; The control module is further configured to: when the sampled voltage provided at the feedback output terminal meets the start-up requirement of the first auxiliary source, control the second auxiliary source and / or the voltage conversion circuit to operate in a standby mode.

8. The inverter power supply system according to any one of claims 1 to 6, characterized in that: The duty cycle of the first driving signal is smaller than the duty cycle of the driving signal of the low-voltage side driver when the inverter operates in the reverse discharge state.

9. An inverter power supply control method, characterized in that: The inverter power supply system according to any one of claims 1 to 8 is implemented, the inverter is provided with a high-voltage side driver and a low-voltage side driver, the power supply system comprises: a bus power supply, a low-voltage power supply, a first auxiliary source and a second auxiliary source; the method comprises: Outputting a first drive signal to the low-voltage side driver, controlling the inverter to boost the first supply voltage provided by the low-voltage power supply and then outputting a bus voltage corresponding to the bus power supply, so that the first auxiliary source at least supplies power to the high-voltage side driver and the low-voltage side driver; and / or, outputting a second drive signal to the second auxiliary source, controlling the second auxiliary source to at least supply power to the high-voltage side driver; And after the high-voltage side driver is powered, the inverter is controlled to operate in a reverse discharge state.

10. A power supply device, characterized in that: include: An inverter power supply system as claimed in any one of claims 1 to 8.

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