Power supply circuit and vehicle-mounted inversion equipment

Abstract

The utility model provides a power supply circuit and vehicle-mounted inversion equipment, and the power supply circuit comprises an interface circuit which is used for accessing an energy supply module and receiving an initial power supply outputted by the energy supply module; the voltage regulating circuit is connected with the interface circuit, and the voltage regulating circuit is used for converting the initial power supply to obtain a voltage-regulated power supply; and the inverter circuit comprises an input end and an output end, the input end is connected with the voltage regulation circuit, the output end is connected with an external load, and the inverter circuit is used for receiving the voltage regulation power supply, carrying out inverter conversion based on the voltage regulation power supply and outputting an alternating current power supply through the output end. The initial power supply is subjected to voltage regulation processing, and then the voltage-regulated power supply obtained through voltage regulation is input into the inverter circuit for inversion conversion, so that the inverter circuit can be compatible with voltages output by different energy supply modules, the inversion efficiency of the inverter circuit and the convenience of the energy supply modules are improved, the inverter circuit is prevented from receiving too high or too low voltages, and the power consumption of the inverter circuit is reduced. Therefore, the inverter circuit cannot work normally and is even damaged.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply circuit and an on-board inverter device. Background Technology

[0002] As the energy storage capacity of vehicle batteries gradually improves, in addition to using the stored power to provide power to the vehicle's own modules, people can also use vehicle batteries to provide power to various electrical appliances and tools so that they can work normally when they go out to work or travel.

[0003] For some electrical appliances or tools that require AC power, an inverter unit is needed to convert the DC power output from the power supply module (i.e., the vehicle battery) into AC power. However, since most common inverter devices can only convert DC power with a narrow voltage range, corresponding inverter units need to be configured in the inverter device for power supply modules with different output voltages. This results in poor compatibility of the inverter device and affects the inverter efficiency. Utility Model Content

[0004] The main purpose of this application is to provide a power supply circuit and an on-board inverter device, which aims to solve the problem that the inverter device has a narrow range of reversible power supply voltages and cannot be compatible with the power output of various different power supply modules.

[0005] In a first aspect, this application provides a power supply circuit, the power supply circuit comprising:

[0006] Interface circuit, used to connect to the power supply module and receive the initial power output from the power supply module;

[0007] The voltage regulation circuit, connected to the interface circuit, is used to convert the initial power supply to obtain a regulated power supply.

[0008] An inverter circuit includes an input terminal and an output terminal. The input terminal is connected to a voltage regulation circuit, and the output terminal is connected to an external load. The inverter circuit is used to receive regulated power and perform inversion conversion based on the regulated power, and output AC power to the outside through the output terminal.

[0009] In some implementations, the voltage regulation circuit is used to convert the initial power supply to obtain a regulated power supply that matches the target voltage level.

[0010] In some implementations, the power supply circuit further includes:

[0011] The main control circuit, connected to the voltage regulation circuit, is used to detect the voltage strength of the initial power supply and output a corresponding control signal to the voltage regulation circuit according to the voltage strength of the initial power supply, so that the voltage regulation circuit responds to the control signal and outputs a regulated power supply that matches the target voltage strength.

[0012] In some implementations, the voltage regulating circuit has a switchable boost mode and a buck mode. In boost mode, the voltage regulating circuit is used to boost the initial power supply, and in buck mode, the voltage regulating circuit is used to buck the initial power supply.

[0013] Among them, when the voltage regulation circuit receives the first control signal, it enters the boost mode, and the first control signal is the control signal output by the main control circuit when the voltage strength of the initial power supply is less than the target voltage strength.

[0014] When the voltage regulation circuit receives the second control signal, it enters the buck mode. The second control signal is the control signal output by the main control circuit when the voltage strength of the initial power supply is greater than the target voltage strength.

[0015] In some implementations, the voltage regulating circuit includes a first bridge arm circuit, a second bridge arm circuit, and an inductor unit;

[0016] The first end of the first bridge arm circuit is connected to the interface circuit, the second end of the first bridge arm circuit is grounded, the first end of the second bridge arm circuit is connected to the inverter circuit, the second end of the second bridge arm circuit is grounded, the first end of the inductor unit is connected to the midpoint of the bridge arm of the first bridge arm circuit, and the second end of the inductor unit is connected to the midpoint of the bridge arm of the second bridge arm circuit.

[0017] Furthermore, the main control circuit is connected to the controlled terminal of the first bridge arm circuit and the controlled terminal of the second bridge arm circuit, so as to control the on / off state of the first bridge arm circuit and the second bridge arm circuit through control signals.

[0018] In some implementations, the first bridge arm circuit includes a first switching unit and a second switching unit. The first terminal of the first switching unit is connected to the interface circuit, the first terminal of the second switching unit is connected to the second terminal of the first switching unit and the first terminal of the inductor unit, and the second terminal of the second switching unit is grounded.

[0019] The second bridge arm circuit includes a third switching unit and a fourth switching unit. The first end of the third switching unit is connected to the inverter circuit. The first end of the fourth switching unit is connected to the second end of the third switching unit and the second end of the inductor unit. The second end of the fourth switching unit is grounded.

[0020] In boost mode, the first switching unit is turned on, the second switching unit is turned off, and the third and fourth switching units are turned on alternately.

[0021] In buck mode, the third switching unit is turned on, the fourth switching unit is turned off, and the first and second switching units are turned on alternately.

[0022] In some implementations, in boost mode, the ratio of the on-time of the first switching unit to the on-time of the second switching unit is matched to the difference between the initial power supply voltage and the target voltage.

[0023] In some implementations, in buck mode, the ratio of the on-time of the third switching unit to the on-time of the fourth switching unit is matched to the difference between the initial power supply voltage and the target voltage.

[0024] In some implementations, the voltage regulating circuit also has a voltage regulation mode, in which the first switching unit and the third switching unit are turned on, and the second switching unit and the fourth switching unit are turned off.

[0025] The voltage regulation circuit enters the voltage regulation mode upon receiving the third control signal, and the third control signal is the control signal output by the main control circuit when the voltage strength of the initial power supply matches the target voltage strength.

[0026] In some implementations, the main control circuit is connected to the control terminals of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit, respectively, to control the on and off states of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit.

[0027] In some implementations, at least one of the first switching unit, the second switching unit, the third switching unit, and the fourth switching unit is a switching transistor.

[0028] In some implementations, the power supply circuit also includes a sampling circuit connected to the interface circuit and the main control circuit. The sampling circuit is used to sample the initial power output of the power supply module to generate a corresponding sampling signal and output the sampling signal to the main control circuit.

[0029] In some implementations, the main control circuit is configured to output a control signal when the initial power supply voltage ranges from 8V to 30V.

[0030] In some implementations, the target voltage level is 18V.

[0031] Secondly, this application also provides an on-board inverter device, which includes an input interface, an output interface, and a power supply circuit as provided in any embodiment of this application. The input interface is connected to the power supply port of the power supply module and is used to obtain the initial power output by the power supply module through the power supply port of the power supply module.

[0032] In some implementations, the power supply module includes a car battery, and the power supply port of the power supply module includes the positive and negative terminals of the car battery;

[0033] The input interface includes a first terminal and a second terminal. The first terminal is used to connect to the positive terminal of the car battery, and the second terminal is used to connect to the negative terminal of the car battery.

[0034] Furthermore, the output interface includes an AC output socket.

[0035] In some embodiments, the vehicle-mounted inverter also includes a housing, a power supply circuit located inside the housing, and an input interface and an output interface located within the housing;

[0036] The on-board inverter equipment also includes at least one of the following:

[0037] The display screen is used to display at least one of the following: electrical parameters of the input interface, electrical parameters of the output interface, electrical parameters of the external vehicle battery, and operating parameters of the on-board inverter.

[0038] USB output interface, used for connecting external power devices;

[0039] The heat dissipation module is used to dissipate heat from the power supply circuit.

[0040] The switch is used to control the operation of the vehicle-mounted inverter equipment. The switch is also connected to the power supply circuit and used to control the operation of the power supply circuit.

[0041] In summary, this application provides a power supply circuit and an on-board inverter device. The power supply circuit includes: an interface circuit for connecting to a power supply module and receiving the initial power output from the power supply module; a voltage regulation circuit connected to the interface circuit, which converts the initial power supply to obtain a regulated power supply; and an inverter circuit, which includes an input terminal and an output terminal. The input terminal is connected to the voltage regulation circuit, and the output terminal is connected to an external load. The inverter circuit receives the regulated power supply and performs inverter conversion based on the regulated power supply, outputting AC power through the output terminal. The power supply circuit provided by this application can regulate the initial power output from the power supply module and then input the regulated power supply into the inverter circuit for inverter conversion. It is compatible with initial power supplies with different voltage values ​​(e.g., initial power output from different power supply modules), improving the convenience and compatibility of power supply modules for outdoor use. Furthermore, it avoids the inverter circuit receiving excessively high or low voltages, which could cause the inverter circuit to malfunction or even be damaged. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1A schematic diagram of a power supply circuit according to an embodiment of this application;

[0044] Figure 2 A schematic diagram of another embodiment of the power supply circuit provided in one embodiment of this application;

[0045] Figure 3 A schematic diagram of a module of an embodiment of an on-board inverter device provided in this application;

[0046] Figure 4 A circuit diagram illustrating one embodiment of the voltage regulation circuit in the power supply circuit provided in this application;

[0047] Figure 5 This is a schematic diagram of a module of an embodiment of an on-board inverter device provided in this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100. Power supply circuit; 10. Interface circuit; 20. Voltage regulation circuit; 21. First bridge arm circuit; 22. Second bridge arm circuit; 30. Inverter circuit; 40. Main control circuit; 50. Sampling circuit;

[0050] 200. Vehicle-mounted inverter; 201. Input interface; 2011. First terminal; 2012. Second terminal; 202. Output interface; 2021. AC output socket; 203. Housing; 204. Display screen; 205. USB output interface; 206. Heat dissipation module; 207. Switch;

[0051] 300, Power supply module; 301, Car battery; 302, Power supply port; 3021, Positive terminal; 3022, Negative terminal;

[0052] Q1, First switching unit; Q2, Second switching unit; Q3, Third switching unit; Q4, Fourth switching unit; L1, Inductor unit. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0055] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0056] Please refer to the following first. Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a module of a power supply circuit according to an embodiment of this application. Figure 2 for Figure 1 This is a schematic diagram of a module of an embodiment of an on-board inverter device provided in this application.

[0057] like Figure 1 As shown, the power supply circuit 100 receives the initial power output from the power supply module 300, converts the initial power to obtain a regulated power supply, and then inverts the regulated power supply to obtain AC power and outputs it. Figure 2 As shown, in one embodiment, the power supply module 300 is a car battery 301, and the power supply circuit 100 is configured to receive the initial power output from the car battery 301.

[0058] Specifically, the power supply circuit 100 includes an interface circuit 10, a voltage regulating circuit 20, and an inverter circuit 30. The interface circuit 10 is used to connect to the power supply module 300 and receive the initial power output from the power supply module 300. The voltage regulating circuit 20 is connected to the interface circuit 10 and is used to convert the initial power supply to obtain a regulated power supply. The inverter circuit 30 includes an input terminal and an output terminal. The input terminal is connected to the voltage regulating circuit 20, and the output terminal is connected to an external load. The inverter circuit 30 receives the regulated power supply, performs inverter conversion based on the regulated power supply, and outputs AC power through the output terminal.

[0059] Specifically, the voltage regulation circuit 20 converts the initial power supply by adjusting its voltage to obtain a regulated power supply. For example, the voltage regulation circuit 20 can use at least one of the following to adjust the voltage of the initial power supply: a linear DC-DC converter, a switching DC-DC converter, a non-isolated and isolated DC-DC converter, a buck DC-DC converter, a boost DC-DC converter, a buck-boost DC-DC converter, and an inverting DC-DC converter.

[0060] It should be noted that the inverter circuit 30 is configured to invert and convert the regulated power supply into AC power. As one embodiment, the initial power supply is a DC power supply; it is readily understood that the regulated power supply obtained from the DC power supply is also a DC power supply. The terms DC and AC power supplies are well-known to those skilled in the art, and their definitions will not be elaborated upon here. Exemplarily, the inverter circuit 30 can employ at least one of the following to invert and convert the regulated power supply: a single-phase inverter circuit 30, a three-phase inverter circuit 30, a voltage source inverter (VSI), and a current source inverter (CSI).

[0061] It should also be noted that the inverter circuit 30 has a suitable conversion voltage range. Within this range, the inverter circuit 30 exhibits high conversion efficiency. Conversely, outside this range, its conversion efficiency decreases significantly or it may even fail to perform conversion. In related technologies, for various initial power supplies with different voltages, such as those output from different power supply modules 300, corresponding inverters need to be configured for each voltage range, increasing the cost and size of the products.

[0062] Based on this, the power supply circuit 100 provided in this application embodiment can regulate the initial power output from the power supply module 300, and then input the regulated power supply obtained after voltage regulation into the inverter circuit 30 for inverter conversion. It can be compatible with initial power supplies with different voltage values ​​(e.g., initial power output from different power supply modules 300), improve the convenience and compatibility of power supply module 300 for outdoor use, and avoid the inverter circuit 30 receiving excessively high or low voltage, which would cause the inverter circuit 30 to malfunction or even be damaged.

[0063] In some implementations, the voltage regulation circuit 20 is used to convert the initial power supply to obtain a regulated power supply that matches the target voltage level.

[0064] It should be noted that the target voltage intensity can be understood as the conversion target of the voltage regulator. The target voltage intensity is within the conversion voltage range adapted by the inverter circuit 30, and the target voltage intensity can be one or more voltage values ​​or one or more voltage ranges.

[0065] As one embodiment, the voltage regulation circuit 20 can be used to convert the initial power supply in the following ways: when the voltage strength of the initial power supply is greater than the target voltage strength, the initial power supply is stepped down to obtain a voltage regulation power supply with a voltage lower than the initial power supply; when the voltage strength of the initial power supply is less than the target voltage strength, the initial power supply is stepped up to obtain a voltage regulation power supply with a voltage higher than the initial power supply; when the voltage strength of the initial power supply is equal to the target voltage strength, the initial power supply can be directly used as the initial power supply output.

[0066] As one embodiment, when the target voltage intensity includes multiple voltage values ​​and / or voltage ranges, the closest voltage value or voltage range can be selected as the conversion target, or the most preferred voltage value or voltage range can be selected as the conversion target.

[0067] It should be understood that since the target voltage intensity is within the conversion voltage range adapted by the inverter circuit 30, the inverter circuit 30 can perform high-efficiency inverter conversion on the regulated power supply after processing by the voltage regulation circuit 20, thereby improving the compatibility and safety of the power supply circuit 100 with different power supply modules 300.

[0068] In some embodiments, the power supply circuit 100 further includes:

[0069] The main control circuit 40 is connected to the voltage regulation circuit 20. It is used to detect the voltage intensity of the initial power supply and output a corresponding control signal to the voltage regulation circuit 20 according to the voltage intensity of the initial power supply, so that the voltage regulation circuit 20 responds to the control signal and outputs a voltage regulation power supply that matches the target voltage intensity.

[0070] Specifically, the main control circuit 40 can output corresponding control signals based on the voltage intensity of the initial power supply to instruct the voltage regulation circuit 20 to perform boost conversion, buck conversion, or no conversion on the initial power supply, thereby obtaining a regulated power supply. As one embodiment, the control signals include a first control signal instructing the voltage regulation circuit 20 to perform boost conversion on the initial power supply, a second control signal instructing the voltage regulation circuit 20 to perform buck conversion on the initial power supply, and a third control signal instructing the voltage regulation circuit 20 not to convert the initial power supply. Furthermore, the control signals can also be used to characterize the voltage intensity of the initial power supply.

[0071] For example, the main control circuit 40 may include a programmable logic controller (PLC), a central processing unit (CPU), a microcontroller unit (MCU), other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The above are merely examples; any control module that can implement the functions of the main control circuit 40 falls within the protection scope of this application.

[0072] By setting the main control circuit 40 to control the conversion behavior of the voltage regulation circuit 20 based on the target voltage strength and the initial power supply voltage strength, the power supply circuit 100 can flexibly adjust the voltage conversion mode of the voltage regulation circuit 20 for different initial power supplies, so that the obtained voltage regulation power supply is within the conversion voltage range adapted by the inverter circuit 30, thereby improving the intelligence and compatibility of the power supply circuit 100.

[0073] In some embodiments, the power supply circuit 100 further includes a sampling circuit 50 connected to the interface circuit 10 and the main control circuit 40. The sampling circuit 50 is used to sample the initial power output by the power supply module 300 to generate a corresponding sampling signal and output the sampling signal to the main control circuit 40.

[0074] Specifically, the sampling circuit 50 is connected to the interface circuit 10. When the power supply module 300 is connected to the interface circuit 10, the sampling circuit 50 can sample the initial power supply output by the power supply module 300 through the interface circuit 10 and output the sampled signal to the main control circuit 40. The sampled signal can be used to characterize the voltage intensity of the initial power supply.

[0075] It should be noted that the sampling signal can be a current signal or other signals converted from the sampled current signal, such as a voltage signal. This application does not limit the specific implementation of the initial power supply for sampling.

[0076] In some implementations, the voltage regulating circuit 20 has a switchable boost mode and a buck mode. In boost mode, the voltage regulating circuit 20 is used to boost the initial power supply, and in buck mode, the voltage regulating circuit 20 is used to buck the initial power supply.

[0077] Among them, when the voltage regulating circuit 20 receives the first control signal, it enters the boost mode, and the first control signal is the control signal output by the main control circuit 40 when the voltage strength of the initial power supply is less than the target voltage strength.

[0078] When the voltage regulating circuit 20 receives the second control signal, it enters the buck mode. The second control signal is the control signal output by the main control circuit 40 when the voltage strength of the initial power supply is greater than the target voltage strength.

[0079] Specifically, when the initial power supply voltage is lower than the target voltage, the main control circuit 40 outputs a first control signal to the voltage regulation circuit 20. The voltage regulation circuit 20 responds to the first control signal and enters boost mode, performing a boost conversion on the initial power supply to obtain a regulated power supply with a voltage higher than the initial power supply. When the initial power supply voltage is higher than the target voltage, the main control circuit 40 outputs a second control signal to the voltage regulation circuit 20. The voltage regulation circuit 20 responds to the second control signal and enters buck mode, performing a buck conversion on the initial power supply to obtain a regulated power supply with a voltage lower than the initial power supply.

[0080] It should be understood that, as explained above, when the target voltage intensity includes multiple voltage values ​​and / or voltage ranges, the closest voltage value or voltage range can be selected as the conversion target, or the most preferred voltage value or voltage range can be selected as the conversion target.

[0081] In some implementations, the voltage regulating circuit 20 also has a voltage stabilization mode.

[0082] Specifically, when the voltage strength of the initial power supply matches the target voltage strength, the main control circuit 40 outputs a third control signal to the voltage regulation circuit 20. The voltage regulation circuit 20 responds to the third control signal and enters the voltage regulation mode. At this time, the voltage regulation circuit 20 connects the interface circuit 10 and the inverter circuit 30, and directly outputs the initial power supply input from the interface circuit 10 as the voltage regulation power supply to the inverter circuit 30.

[0083] Based on the initial power supply voltage, the voltage regulation circuit 20 can flexibly switch between boost mode, buck mode and regulated mode to output a voltage regulation power supply that matches the target voltage level, thus avoiding the reduction in efficiency of the inverter circuit 30 due to the voltage regulation power supply being too low or too high.

[0084] In some embodiments, the main control circuit 40 is configured to output a control signal when the initial power supply voltage range is 8V to 30V. Taking a car battery 301 as an example for the power supply module 300, the output power of commonly used car batteries is in the voltage range of 8V to 30V. The embodiments of this application can be well adapted to various types of car batteries 301 and are compatible with a wide range of initial power supplies.

[0085] In some embodiments, the main control circuit 40 is configured to shut down the voltage regulation circuit 20 when the initial power supply voltage exceeds the safe range, at which point the voltage regulation circuit 20 does not output regulated power. As one embodiment, the safe range is 8V to 30V, meaning the main control circuit 40 is configured to shut down the voltage regulation circuit 20 when the initial power supply voltage is less than 8V or greater than 30V, at which point the voltage regulation circuit 20 does not output regulated power. It should be noted that when the initial power supply is below the minimum safe range, the energy storage module experiences undervoltage, and when the initial power supply is above the maximum safe range, the energy storage module experiences overvoltage. Continuing to use the power supply module 300 to supply power under overvoltage conditions will lead to safety hazards. Under undervoltage conditions, the power supply module 300 itself lacks sufficient power and cannot supply power normally. Therefore, in this embodiment, the main control circuit 40 implements undervoltage and overvoltage protection for the power supply module 300 based on the initial power supply voltage, improving the intelligence and safety of the power supply.

[0086] In some implementations, the target voltage is 18V. It should be understood that a target voltage of 18V is well-suited for selection of commonly available automotive inverters.

[0087] The circuit structure of the voltage regulation circuit 20 is described in detail below:

[0088] In some embodiments, the voltage regulating circuit 20 includes a first bridge arm circuit 21, a second bridge arm circuit 22, and an inductor unit L1;

[0089] Wherein, the first end of the first bridge arm circuit 21 is connected to the interface circuit 10, the second end of the first bridge arm circuit 21 is grounded, the first end of the second bridge arm circuit 22 is connected to the inverter circuit 30, the second end of the second bridge arm circuit 22 is grounded, the first end of the inductor unit L1 is connected to the midpoint of the bridge arm of the first bridge arm circuit 21, and the second end of the inductor unit L1 is connected to the midpoint of the bridge arm of the second bridge arm circuit 22.

[0090] Furthermore, the main control circuit 40 is connected to the controlled end of the first bridge arm circuit 21 and the controlled end of the second bridge arm circuit 22, so as to control the on / off state of the first bridge arm circuit 21 and the second bridge arm circuit 22 through control signals.

[0091] Specifically, the voltage regulating circuit 20 in this embodiment employs a buck-boost DC-DC converter, specifically an H-bridge topology Boost-buck circuit. The main control circuit 40 can output control signals to the controlled terminals of the first bridge arm circuit 21 and the second bridge arm circuit 22 to control the voltage regulating circuit 20 to flexibly switch between boost mode, buck mode, and regulated mode. Furthermore, the main control circuit 40 can adjust the difference between the regulated power supply and the initial power supply via control signals, i.e., the boost amplitude of the voltage regulating circuit 20 in boost mode, or the buck amplitude of the voltage regulating circuit 20 in buck mode.

[0092] As one embodiment, the first bridge arm circuit 21 includes a first switch 207 unit and a second switch 207 unit. The first end of the first switch 207 unit is connected to the interface circuit 10. The first end of the second switch 207 unit is connected to the second end of the first switch 207 unit and the first end of the inductor unit L1. The second end of the second switch 207 unit is grounded.

[0093] The second bridge arm circuit 22 includes a third switch unit 207 and a fourth switch unit 207. The first end of the third switch unit 207 is connected to the inverter circuit 30. The first end of the fourth switch unit 207 is connected to the second end of the third switch unit 207 and the second end of the inductor unit L1. The second end of the fourth switch unit 207 is grounded.

[0094] Specifically, the controlled terminals of the first bridge arm circuit 21 refer to the controlled terminals of the first switch 207 unit and the second switch 207 unit. The main control circuit 40 is used to send control signals to the controlled terminals of the first switch 207 unit to control the on / off state between the first and second terminals of the first switch 207 unit, and to send control signals to the controlled terminals of the second switch 207 unit to control the on / off state between the first and second terminals of the second switch 207 unit. Similarly, the controlled terminals of the second bridge arm circuit 22 refer to the controlled terminals of the third switch 207 unit and the fourth switch 207 unit. The main control circuit 40 is used to send control signals to the controlled terminals of the third switch 207 unit to control the on / off state between the first and second terminals of the third switch 207 unit, and to send control signals to the controlled terminals of the fourth switch 207 unit to control the on / off state between the first and second terminals of the fourth switch 207 unit.

[0095] As one embodiment, in boost mode, the first switch 207 unit is turned on, the second switch 207 unit is turned off, and the third switch 207 unit and the fourth switch 207 unit are turned on alternately.

[0096] Based on the characteristics of inductor unit L1, under the above conditions, the voltage at the first terminal of the third switch 207 unit is greater than the voltage at the first terminal of the first switch 207 unit, that is, the voltage regulating circuit 20 plays the role of boosting and regulating the initial power supply.

[0097] As one embodiment, in buck mode, the third switch 207 unit is turned on, the fourth switch 207 unit is turned off, and the first switch 207 unit and the second switch 207 unit are turned on alternately.

[0098] Based on the characteristics of inductor unit L1, under the above conditions, the voltage at the first terminal of the third switch 207 unit is less than the voltage at the first terminal of the first switch 207 unit, that is, the voltage regulating circuit 20 plays the role of reducing the voltage of the initial power supply.

[0099] As one embodiment, in the voltage regulation mode, the first switch unit 207 and the third switch unit 207 are turned on, while the second switch unit 207 and the fourth switch unit 207 are turned off;

[0100] Among them, when the voltage regulating circuit 20 receives the third control signal, it enters the voltage regulation mode, and the third control signal is the control signal output by the main control circuit 40 when the voltage strength of the initial power supply matches the target voltage strength.

[0101] Specifically, based on the characteristics of the inductor unit L1, under the above-described state, the voltage at the first terminal of the third switch 207 unit is equal to the voltage at the first terminal of the first switch 207 unit, that is, the initial power supply input to the voltage regulating circuit 20 is the same as the voltage of the voltage regulating power supply output from the voltage regulating circuit 20.

[0102] In some implementations, in boost mode, the ratio of the on-time of the first switch 207 unit to the on-time of the second switch 207 unit is matched to the difference between the initial power supply voltage intensity and the target voltage intensity.

[0103] Specifically, the higher the ratio of the on-time of the first switch 207 unit to the on-time of the second switch 207 unit, the greater the difference between the initial power supply voltage and the target voltage, meaning the higher the boost voltage of the voltage regulating circuit 20 to the initial power supply. Conversely, the smaller the ratio of the on-time of the first switch 207 unit to the on-time of the second switch 207 unit, the lower the difference between the initial power supply voltage and the target voltage, meaning the lower the boost voltage of the voltage regulating circuit 20 to the initial power supply.

[0104] In some implementations, in buck mode, the ratio of the on-time of the third switch 207 unit to the on-time of the fourth switch 207 unit is matched to the difference between the initial power supply voltage and the target voltage.

[0105] Specifically, the higher the ratio of the conduction time of the fourth switch 207 unit to the conduction time of the third switch 207 unit, the greater the difference between the initial power supply voltage and the target voltage, meaning the higher the voltage reduction of the initial power supply by the voltage regulating circuit 20. Conversely, the lower the ratio of the conduction time of the fourth switch 207 unit to the conduction time of the third switch 207 unit, the smaller the difference between the initial power supply voltage and the target voltage, meaning the lower the voltage reduction of the initial power supply by the voltage regulating circuit 20.

[0106] It should be noted that when the initial power supply voltage ranges from 8V to 30V and the output power is 500W (a common output power of a car battery 301), the current stress of the initial power supply is close to 70A. For the relatively low-power inverter circuit 30, it is difficult to maintain efficiency. Here, by utilizing the on-time ratio between different switch units 207, the voltage output of the voltage regulating circuit 20 can be precisely modulated, ensuring that the overall efficiency of the power supply circuit 100 is not less than 90%, and reducing the design and selection difficulty of the inverter circuit 30.

[0107] In some implementations, the main control circuit 40 is connected to the control terminals of the first switch 207 unit, the second switch 207 unit, the third switch 207 unit, and the fourth switch 207 unit, respectively, to control the on and off states of the first switch 207 unit, the second switch 207 unit, the third switch 207 unit, and the fourth switch 207 unit.

[0108] Specifically, the first switch unit 207, the second switch unit 207, the third switch unit 207, and the fourth switch unit 207 can be a switch 207 transistor, a transistor, or other controllable circuit switch 207 units. As one embodiment, at least one of the first switch unit 207, the second switch unit 207, the third switch unit 207, and the fourth switch unit 207 is a switch 207 transistor. It should be understood that by using a switch 207 transistor as the switch unit, the control circuit can drive the first bridge arm circuit 21 and the second bridge arm circuit 22 with a lower level signal, significantly reducing the difficulty of circuit design and component selection.

[0109] Please see Figure 3 and Figure 5 This application also provides an on-board inverter device 200, which includes an input interface 201, an output interface 202, and a power supply circuit 100 as provided in any embodiment of the application. The input interface 201 is connected to the power supply port 302 of the power supply module 300 and is used to obtain the initial power output by the power supply module 300 through the power supply port 302 of the power supply module 300.

[0110] Specifically, the power supply circuit 100 is used to connect to the power supply port 302 of the power supply module 300 through the interface circuit 10, that is, the initial power output by the power supply module 300 is input to the interface circuit 10 through the power supply port 302.

[0111] In some embodiments, the power supply module 300 includes a car battery 301, and the power supply port 302 of the power supply module 300 includes the positive terminal 3021 and the negative terminal 3022 of the car battery 301.

[0112] The input interface 201 includes a first terminal 2011 and a second terminal 2012. The first terminal 2011 is used to connect to the positive terminal 3021 of the car battery 301, and the second terminal 2012 is used to connect to the negative terminal 3022 of the car battery 301.

[0113] Furthermore, the output interface 202 includes an AC output socket 2021.

[0114] Specifically, the AC output socket 2021 is used to connect to AC electrical appliances. The power supply circuit 100 is used to connect to the positive terminal 3021 of the car battery 301 through the first terminal 2011 and to the negative terminal 3022 of the car battery 301 through the second terminal 2012 to obtain the initial power output from the power supply module 300. Then, the initial power is processed to obtain AC power and then output. In this way, the electrical energy stored in the car battery 301 can be converted into AC power and used to power AC electrical appliances. This makes it convenient for users to use the electrical energy of the car battery 301 to provide power to various AC electrical appliances outdoors, bringing a convenient outdoor power experience.

[0115] For example, the car battery 301 includes a rechargeable battery or a supercapacitor, and the rechargeable battery includes, but is not limited to, sodium batteries, lithium batteries, and lead-acid batteries.

[0116] In some embodiments, the vehicle-mounted inverter 200 further includes a housing 203, a power supply circuit 100 disposed within the housing 203, and an input interface 201 and an output interface 202 disposed within the housing 203.

[0117] As one embodiment, the vehicle-mounted inverter 200 also includes a lighting device, which includes at least one or more of LED lamps, incandescent lamps, fluorescent lamps, magnesium lamps, xenon lamps, high-pressure pump lamps, high-pressure sodium lamps, and halogen lamps. The lighting device is disposed in the housing 203 and is capable of providing illumination.

[0118] In some embodiments, the on-board inverter 200 further includes at least one of the following:

[0119] Display screen 204 is used to display at least one of the following: electrical parameters of input interface 201, electrical parameters of output interface 202, electrical parameters of external vehicle battery, and operating parameters of vehicle inverter device 200.

[0120] USB output interface 205 is used for connecting external power devices;

[0121] The heat dissipation module 206 is used to dissipate heat from the power supply circuit 100;

[0122] Switch 207 is used to control the operation of the vehicle-mounted inverter 200. Switch 207 is also connected to the power supply circuit 100 to control the operation of the power supply circuit 100.

[0123] In some embodiments, the power supply device further includes an electrical connection interface 700, which includes at least one or more of a USB interface, an AC socket, a DC interface, and a cigarette lighter socket, and is used to connect to the energy storage module 200 of the power supply device 400.

[0124] In summary, this application provides a power supply circuit 100 and an on-board inverter device 200. The power supply circuit 100 includes: an interface circuit 10 for connecting to a power supply module 300 and receiving the initial power output from the power supply module 300; a voltage regulation circuit 20 connected to the interface circuit 10, which converts the initial power to obtain a regulated power supply; and an inverter circuit 30, which includes an input terminal and an output terminal. The input terminal is connected to the voltage regulation circuit 20, and the output terminal is connected to an external load. The inverter circuit 30 receives the regulated power supply, performs inverter conversion based on the regulated power supply, and outputs AC power to the outside through the output terminal. The power supply circuit 100 provided in this application embodiment can regulate the initial power output from the power supply module 300, and then input the regulated power supply obtained after voltage regulation into the inverter circuit 30 for inverter conversion. It can be compatible with initial power supplies with different voltage values ​​(e.g., initial power supplies output from different power supply modules 300), improve the convenience and compatibility of power supply module 300 for outdoor use, and avoid the inverter circuit 30 receiving excessively high or low voltage, which would cause the inverter circuit 30 to malfunction or even be damaged.

[0125] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0126] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0127] It should also be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0128] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply circuit, characterized in that, include: An interface circuit is used to connect to the power supply module and receive the initial power output from the power supply module; A voltage regulating circuit is connected to the interface circuit. The voltage regulating circuit is used to convert the initial power supply to obtain a regulated power supply. An inverter circuit includes an input terminal and an output terminal. The input terminal is connected to the voltage regulation circuit, and the output terminal is connected to an external load. The inverter circuit receives the voltage regulation power supply, performs inverter conversion based on the voltage regulation power supply, and outputs AC power to the outside through the output terminal.

2. The power supply circuit as described in claim 1, characterized in that, The voltage regulation circuit is used to convert the initial power supply to obtain a voltage regulation power supply that matches the target voltage level.

3. The power supply circuit as described in claim 1 or 2, characterized in that, The power supply circuit also includes: The main control circuit, connected to the voltage regulation circuit, is used to detect the voltage intensity of the initial power supply and output a corresponding control signal to the voltage regulation circuit according to the voltage intensity of the initial power supply, so that the voltage regulation circuit responds to the control signal and outputs a voltage regulation power supply that matches the target voltage intensity.

4. The power supply circuit as described in claim 3, characterized in that, The voltage regulating circuit has a switchable boost mode and a buck mode. In the boost mode, the voltage regulating circuit is used to boost the initial power supply, and in the buck mode, the voltage regulating circuit is used to buck the initial power supply. Wherein, the voltage regulation circuit enters the boost mode when it receives the first control signal, and the first control signal is the control signal output by the main control circuit when the voltage strength of the initial power supply is less than the target voltage strength; When the voltage regulating circuit receives the second control signal, it enters the buck mode. The second control signal is the control signal output by the main control circuit when the voltage strength of the initial power supply is greater than the target voltage strength.

5. The power supply circuit as described in claim 4, characterized in that, The voltage regulation circuit includes a first bridge arm circuit, a second bridge arm circuit, and an inductor unit; Wherein, the first end of the first bridge arm circuit is connected to the interface circuit, the second end of the first bridge arm circuit is grounded, the first end of the second bridge arm circuit is connected to the inverter circuit, the second end of the second bridge arm circuit is grounded, the first end of the inductor unit is connected to the midpoint of the bridge arm of the first bridge arm circuit, and the second end of the inductor unit is connected to the midpoint of the bridge arm of the second bridge arm circuit. Furthermore, the main control circuit is connected to the controlled terminal of the first bridge arm circuit and the controlled terminal of the second bridge arm circuit, so as to control the on / off state of the first bridge arm circuit and the second bridge arm circuit through control signals.

6. The power supply circuit as described in claim 5, characterized in that, The first bridge arm circuit includes a first switching unit and a second switching unit. The first end of the first switching unit is connected to the interface circuit. The first end of the second switching unit is connected to the second end of the first switching unit and the first end of the inductor unit. The second end of the second switching unit is grounded. The second bridge arm circuit includes a third switching unit and a fourth switching unit. The first terminal of the third switching unit is connected to the inverter circuit, and the first terminal of the fourth switching unit is connected to the second terminal of the third switching unit and the second terminal of the inductor unit. The second terminal of the fourth switching unit is grounded. In the boost mode, the first switching unit is turned on, the second switching unit is turned off, and the third and fourth switching units are turned on alternately. In the buck mode, the third switching unit is turned on, the fourth switching unit is turned off, and the first switching unit and the second switching unit are turned on alternately.

7. The power supply circuit as described in claim 6, characterized in that, In the boost mode, the ratio of the on-time of the first switching unit to the on-time of the second switching unit is matched to the difference between the voltage intensity of the initial power supply and the target voltage intensity.

8. The power supply circuit as described in claim 6, characterized in that, In the buck mode, the ratio of the on-time of the third switching unit to the on-time of the fourth switching unit is matched to the difference between the voltage intensity of the initial power supply and the target voltage intensity.

9. The power supply circuit as described in claim 6, characterized in that, The voltage regulating circuit also has a voltage stabilization mode, in which the first switching unit and the third switching unit are turned on, and the second switching unit and the fourth switching unit are turned off. The voltage regulating circuit enters the voltage regulation mode upon receiving a third control signal, and the third control signal is the control signal output by the main control circuit when the voltage strength of the initial power supply matches the target voltage strength.

10. The power supply circuit as described in claim 6, characterized in that, The main control circuit is connected to the control terminals of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit, respectively, to control the on and off states of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit.

11. The power supply circuit as described in claim 6, characterized in that, At least one of the first switching unit, the second switching unit, the third switching unit, and the fourth switching unit is a switching transistor.

12. The power supply circuit as described in claim 3, characterized in that, The power supply circuit also includes a sampling circuit connected to the interface circuit and the main control circuit. The sampling circuit is used to sample the initial power output by the power supply module to generate a corresponding sampling signal, and output the sampling signal to the main control circuit.

13. The power supply circuit as described in claim 3, characterized in that, The main control circuit is configured to output the control signal when the initial power supply voltage range is 8V to 30V.

14. The power supply circuit as described in claim 3, characterized in that, The target voltage level is 18V.

15. A vehicle-mounted inverter, characterized in that, The vehicle-mounted inverter includes an input interface, an output interface, and a power supply circuit as described in any one of claims 1-14. The input interface is connected to the power supply port of the power supply module and is used to obtain the initial power output by the power supply module through the power supply port of the power supply module.

16. The vehicle-mounted inverter equipment as described in claim 15, characterized in that, The power supply module includes a car battery, and the power supply port of the power supply module includes the positive and negative terminals of the car battery; The input interface includes a first terminal and a second terminal. The first terminal is used to connect to the positive terminal of the car battery, and the second terminal is used to connect to the negative terminal of the car battery. Furthermore, the output interface includes an AC output socket.

17. The vehicle-mounted inverter equipment as described in claim 15, characterized in that, The vehicle-mounted inverter also includes a housing, the power supply circuit is located inside the housing, and the input interface and the output interface are located in the housing; The on-board inverter equipment also includes at least one of the following: The display screen is used to display at least one of the following: electrical parameters of the input interface, electrical parameters of the output interface, electrical parameters of the external vehicle battery, and operating parameters of the on-board inverter. USB output interface, used for connecting external power devices; A heat dissipation module is used to dissipate heat from the power supply circuit; A switch is used to control the operation of the vehicle-mounted inverter equipment. The switch is also connected to the power supply circuit to control the operation of the power supply circuit.

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