150W power adapter for converting DC (direct current) into AC (alternating current)

Abstract

The utility model discloses a 150W power adapter capable of converting DC (direct current) into AC (alternating current). The internal circuit comprises a DC input line, an anti-interference circuit, a push-pull quasi-resonant drive boost high-voltage bus circuit, a low-voltage-to-high-voltage high-frequency transformer circuit, a bridge rectifier filter circuit, a full-bridge conversion inverter circuit, an AC 220V pure sine wave output circuit, an output current feedback circuit and a high-voltage bus isolation feedback circuit. A front-stage push-pull quasi-resonance driving module circuit and a rear-stage SPWM modulation high-voltage driving digital-analog module circuit. The DC-DC / DC-AC two-stage power conversion circuit is of a DC-DC / DC-AC two-stage power conversion structure, the front stage is an isolation DC-DC booster circuit, the rear stage is a DC-AC full-bridge converter, high-voltage DC bus voltage is converted into pure sine wave 220V AC voltage, and the high-precision output requirement of the inversion industry can be met; the front stage and the rear stage provide perfect protection functions, the service life of the power adapter is prolonged, and the power adapter is more reliable and convenient to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of power adapters, and particularly relates to a 150W power adapter for DC to AC inversion. Background Art

[0002] The power adapter with inversion property is a power adapter that can convert low-voltage direct current of 12V or 24V into alternating current of AC220V identical to the commercial power, so as to supply general electrical appliances using alternating current. It is a convenient power converter, generally used in vehicle-mounted power supplies, energy storage boxes, UPS power supplies, etc. At present, the internal circuit structure design of the power adapter with inversion property is relatively simple, and there are the following problems: (1) The accuracy of the sine wave characteristics output by it is not high, and it cannot meet the power consumption requirements of some precision devices with high power consumption quality requirements; (2) The circuit protection functions and indication functions such as under-voltage, over-voltage, over-current, and high temperature of the voltage are incomplete, resulting in inconvenience in use and easy damage of the power adapter itself. Content of the Utility Model

[0003] The purpose of the utility model is to provide a 150W power adapter for DC to AC inversion in view of the above problems, which is a power adapter with a pure sine wave output, and has better circuit protection functions such as short circuit, overload, over-current, and over-temperature protection, increasing the service life of the power adapter.

[0004] The utility model is realized through the following technical solutions:

[0005] A 150W power adapter for DC to AC inversion, characterized in that: its internal circuit includes a DC input line and an anti-interference circuit, a push-pull quasi-resonant drive boost high-voltage bus circuit, a low-voltage to high-voltage high-frequency transformer circuit, a bridge rectifier filter circuit, a full-bridge conversion inverter circuit, an AC 220V pure sine wave output circuit, an output current feedback circuit, a high-voltage bus isolation feedback circuit, a front-stage push-pull quasi-resonant drive module circuit, and a rear-stage SPWM modulation high-voltage drive digital-to-analog module circuit; the DC input line and the anti-interference circuit are connected to the DC output terminal of the storage battery, and are connected to the low-voltage to high-voltage high-frequency transformer circuit through the push-pull quasi-resonant drive boost high-voltage bus circuit. The front-stage push-pull quasi-resonant drive module circuit provides a drive signal to the push-pull quasi-resonant drive boost high-voltage bus circuit. The push-pull quasi-resonant drive boost high-voltage bus circuit includes two MOS transistors V1 and V2. The low-voltage to high-voltage high-frequency transformer circuit includes a transformer T1, which converts the low-voltage and low-frequency direct current input by the DC input line and the anti-interference circuit into high-voltage and high-frequency direct current output under the action of the push-pull quasi-resonant drive boost high-voltage bus circuit; the output of the low-voltage to high-voltage high-frequency transformer circuit is rectified by the bridge rectifier filter circuit and then input to the full-bridge conversion inverter circuit. The full-bridge conversion inverter circuit includes a four-way full-bridge inverter circuit composed of four MOS transistors S1, S2, S3, and S4. The rear-stage SPWM modulation high-voltage drive digital-to-analog module circuit adopts a current-mode and center-aligned SPWM modulation method to provide drive signals to the four MOS transistors of the full-bridge conversion inverter circuit to output a voltage of pure sine wave 220VAC; an output current feedback circuit and a high-voltage bus isolation feedback circuit are connected to the high-voltage bus of the bridge rectifier filter circuit. The current feedback signal of the output current feedback circuit and the voltage feedback signal of the high-voltage bus isolation feedback circuit are input to the front-stage push-pull quasi-resonant drive module circuit; the output of the full-bridge conversion inverter circuit is connected to the AC 220V pure sine wave output circuit.

[0006] Further, a fuse F1 is provided in the DC input line and the anti-interference circuit.

[0007] Further, the front-stage push-pull quasi-resonant drive module circuit is provided with a storage battery under-voltage and over-voltage shutdown, under-voltage buzzer, and over-current shutdown protection circuit.

[0008] Further, the front-stage push-pull quasi-resonant drive module circuit includes a chip U2, which inputs the voltage feedback signal of the high-voltage bus isolation feedback circuit for closed-loop voltage stabilization and limits the maximum voltage to prevent the MOS transistors in the push-pull quasi-resonant drive boost high-voltage bus circuit from being burned out due to excessive voltage during no-load.

[0009] Furthermore, the post-stage SPWM modulation high-voltage drive digital-to-analog module circuit is provided with DC bus overvoltage and undervoltage protection, AC output undervoltage protection, overload alarm prompt, overload protection indication, overcurrent protection indication, overtemperature protection indication, and short-circuit protection indication circuits.

[0010] Furthermore, the post-stage SPWM modulation high-voltage drive digital-to-analog module circuit is provided with an output voltage feedback circuit and an output current feedback circuit formed with the AC 220V pure sine wave output circuit.

[0011] The beneficial effects of the present utility model are as follows: 1. The 150W power adapter of the present utility model for DC to AC inversion has a two-stage power conversion structure of DC-DC / DC-AC. The front stage is an isolated DC-DC boost circuit, which adopts a front-stage push-pull resonant boost drive module to boost the DC low voltage of the battery to a high-voltage DC bus voltage of 310 - 400V. The post stage is a DC-AC full-bridge converter, which adopts a current-mode SPWM drive module to convert the high-voltage DC bus voltage into a pure sine wave 220VAC voltage, and can achieve the characteristics of a no-load waveform distortion rate of less than 1.5%, a full-load waveform distortion rate of less than 3%, and a high-precision output voltage, meeting the high-precision output requirements of the inverter industry. 2. Both the front stage and the post stage provide perfect protection functions. The front stage is provided with battery undervoltage and overvoltage shutdown, undervoltage buzzer, and overcurrent shutdown protection circuits. The post stage is provided with DC bus overvoltage and undervoltage protection, AC output undervoltage protection, overload alarm prompt, overload protection indication, overcurrent protection indication, overtemperature protection indication, and short-circuit protection indication circuits, increasing the service life of the power adapter and making it more reliable and convenient to use. Description of the Drawings

[0012] Figure 1 It is the principle block diagram of the present utility model.

[0013] Figure 2 It is the schematic diagram of the first part of the circuit of the present utility model.

[0014] Figure 3 It is the schematic diagram of the second part of the circuit of the present utility model.

[0015] Figure 4 It is the schematic diagram of the third part of the circuit of the present utility model.

[0016] In the figure, 1. DC input line and anti-interference circuit; 2. Push-pull quasi-resonant drive boost high-voltage bus circuit; 3. Low-voltage to high-voltage high-frequency transformer circuit; 4. Bridge rectifier filter circuit; 5. Full-bridge conversion inverter circuit; 6. AC 220V pure sine wave output circuit; 7. Output current feedback circuit; 8. High-voltage bus isolation feedback circuit; 9. Front-stage push-pull quasi-resonant drive module circuit; 10. Post-stage SPWM modulation high-voltage drive digital-to-analog module circuit. Detailed Implementation Manner

[0017] The present utility model will be further described below in conjunction with specific examples and drawings.

[0018] As Figures 1-4 shown, a 150W power adapter for DC to AC inversion, its internal circuit includes a DC input line and an anti-interference circuit 1, a push-pull quasi-resonant drive boost high-voltage bus circuit 2, a low-voltage to high-voltage high-frequency transformer circuit 3, a bridge rectifier filter circuit 4, a full-bridge conversion inverter circuit 5, an AC 220V pure sine wave output circuit 6, an output current feedback circuit 7, a high-voltage bus isolation feedback circuit 8, a front-stage push-pull quasi-resonant drive module circuit 9 and a rear-stage SPWM modulation high-voltage drive digital-to-analog module circuit 10; the DC input line and the anti-interference circuit 1 are connected to the DC output end of the battery, and a fuse F1 is provided. The DC input line and the anti-interference circuit 1 are connected to the low-voltage to high-voltage high-frequency transformer circuit 3 through the push-pull quasi-resonant drive boost high-voltage bus circuit 2. The front-stage push-pull quasi-resonant drive module circuit 9 provides drive signals G2 and G1 to the push-pull quasi-resonant drive boost high-voltage bus circuit 2. The push-pull quasi-resonant drive boost high-voltage bus circuit 2 includes two MOS transistors V1 and V2. The low-voltage to high-voltage high-frequency transformer circuit 3 includes a transformer T1, which converts the low-voltage and low-frequency direct current input by the DC input line and the anti-interference circuit 1 into high-voltage and high-frequency direct current output under the action of the push-pull quasi-resonant drive boost high-voltage bus circuit 2. The output of the low-voltage to high-voltage high-frequency transformer circuit 3 is rectified by the bridge rectifier filter circuit 4 and then input to the full-bridge conversion inverter circuit 5. The full-bridge conversion inverter circuit 5 includes a four-way full-bridge inverter circuit composed of four MOS transistors S1, S2, S3 and S4. The rear-stage SPWM modulation high-voltage drive digital-to-analog module circuit 10 adopts a current-mode and center-aligned SPWM modulation method, and provides drive signals 2HO, 2LO, 1HO, 1LO to the four MOS transistors S1, S2, S3 and S4 of the full-bridge conversion inverter circuit 5, driving the full-bridge conversion inverter circuit 5 to output a voltage of pure sine wave 220VAC. The output current feedback circuit 7 and the high-voltage bus isolation feedback circuit 8 are connected to the high-voltage bus of the bridge rectifier filter circuit 4. The current feedback signal of the output current feedback circuit 7 and the voltage feedback signal of the high-voltage bus isolation feedback circuit 8 are input to the front-stage push-pull quasi-resonant drive module circuit 9; the output of the full-bridge conversion inverter circuit 5 is connected to the AC 220V pure sine wave output circuit 6.

[0019] The front-stage push-pull quasi-resonant drive module circuit 9 is provided with a battery under-voltage and over-voltage shutdown, under-voltage buzzer and over-current shutdown protection circuit.

[0020] The pre-stage push-pull quasi-resonant drive module circuit 9 includes a chip U2, which inputs the voltage feedback signal of the high-voltage bus isolation feedback circuit 8 for closed-loop voltage regulation and limits the maximum voltage to prevent the MOS transistors V1 and V2 in the push-pull quasi-resonant drive boost high-voltage bus circuit 2 from being burned out due to excessive voltage under no-load conditions.

[0021] The post-stage SPWM modulation high-voltage drive digital-to-analog module circuit 10 is provided with circuits for DC bus overvoltage and undervoltage protection, AC output undervoltage protection, overload alarm indication, overload protection indication, overcurrent protection indication, overtemperature protection indication, and short-circuit protection indication.

[0022] The post-stage SPWM modulation high-voltage drive digital-to-analog module circuit 10 is provided with an output voltage feedback circuit and an output current feedback circuit formed with the AC 220V pure sine wave output circuit 6.

[0023] The above embodiments are only relatively preferred implementation manners of the present invention, which are only used to explain the present invention rather than limit the present invention. Any changes, substitutions, combinations, simplifications, modifications, etc. made by those skilled in the art without departing from the spirit and principle of the present invention shall be equivalent replacement manners and shall all be included within the protection scope of the present invention.

Claims

1. A 150W power adapter for DC to AC inversion, characterized in that: Its internal circuit includes a DC input circuit and an anti-interference circuit, a push-pull quasi-resonant drive boost high-voltage bus circuit, a low-voltage to high-voltage high-frequency transformer circuit, a bridge rectifier filter circuit, a full-bridge conversion inverter circuit, an AC 220V pure sinusoidal wave output circuit, an output current feedback circuit, a high-voltage bus isolation feedback circuit, a front-stage push-pull quasi-resonant drive module circuit and a rear-stage SPWM modulation high-voltage drive digital-analog module circuit; the DC input circuit and the anti-interference circuit are connected to the DC output end of the battery, and are connected to the low-voltage to high-voltage high-frequency transformer circuit through the push-pull quasi-resonant drive boost high-voltage bus circuit, and the front-stage push-pull quasi-resonant drive module circuit provides a drive signal to the push-pull quasi-resonant drive boost high-voltage bus circuit. No., the push-pull quasi-resonant drive boost high-voltage bus circuit includes two MOS tubes V1 and V2, and the low-voltage to high-voltage high-frequency transformer circuit includes a transformer T1, which converts the low-voltage and low-frequency DC power input from the DC input line and the anti-interference circuit into a high-voltage and high-frequency DC power output under the action of the push-pull quasi-resonant drive boost high-voltage bus circuit; the output of the low-voltage to high-voltage and high-frequency transformer circuit is rectified by the bridge rectifier filter circuit and input into the full-bridge conversion inverter circuit, and the full-bridge conversion inverter circuit includes a four-way full-bridge inverter circuit composed of four MOS tubes S1, S2, S3 and S4, and the post-stage SPWM modulation high-voltage drive digital-analog module circuit adopts current mode and center-aligned SPWM Modulation mode, providing drive signals to the four MOS tubes of the full-bridge conversion inverter circuit to output a pure sine wave 220VAC voltage; the output current feedback circuit and the high-voltage bus isolation feedback circuit are connected to the high-voltage bus of the bridge rectifier filter circuit, and the current feedback signal of the output current feedback circuit and the voltage feedback signal of the high-voltage bus isolation feedback circuit are input to the front-stage push-pull quasi-resonant drive module circuit; the output of the full-bridge conversion inverter circuit is connected to the AC 220V pure sine wave output circuit.

2. The 150W DC-to-AC power adapter according to claim 1, characterized in that: The DC input circuit and the anti-interference circuit are provided with a fuse F1.

3. The 150W power adapter for DC to AC inversion according to claim 1, characterized in that: The front-stage push-pull quasi-resonant drive module circuit is provided with battery undervoltage and overvoltage shutdown, undervoltage buzzing and overcurrent shutdown protection circuits.

4. The 150W power adapter for DC to AC inversion according to claim 1, characterized in that: The front-stage push-pull quasi-resonant driving module circuit includes a chip U2, which inputs the voltage feedback signal of the high-voltage bus isolation feedback circuit for closed-loop voltage regulation and limits the maximum voltage.

5. The 150W power adapter for DC to AC inversion according to claim 1, characterized in that: The post-stage SPWM modulation high-voltage drive digital-analog module circuit is provided with DC bus overvoltage and undervoltage protection, AC output undervoltage protection, overload alarm prompt, overload protection indication, overcurrent protection indication, overtemperature protection indication and short circuit protection indication circuit.

6. The 150W power adapter for DC to AC inversion according to claim 1, characterized in that: The post-stage SPWM modulation high-voltage drive digital-analog module circuit is provided with an output voltage feedback circuit and an output current feedback circuit formed with the AC 220V pure sine wave output circuit.

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