Push-pull quasi-resonance control module power adapter

Abstract

The utility model discloses a power adapter of a push-pull quasi-resonance control module, and an internal circuit of the power adapter comprises the push-pull quasi-resonance control module. The push-pull quasi-resonance control module comprises a current sampling amplification circuit, a current voltage and temperature protection and logic control circuit, a battery voltage and temperature acquisition circuit, a push-pull resonance PWM modulation output circuit and a DC-to-DC step-down circuit. According to the utility model, the pre-stage push-pull resonance boost driving module is adopted to drive the pre-stage DC-DC boost bus circuit, DC boost of the storage battery is realized, the pre-stage push-pull resonance boost driving module provides battery under-voltage turn-off, battery over-voltage turn-off, output over-current and short-circuit protection, and two paths of push-pull output PWM signals with complementary upper and lower tubes are provided at the same time; the chip is integrated, a perfect protection function is provided, peripheral circuits and components are reduced, and the power adapter is favorable for saving production cost and miniaturizing the size.

Description

Technical Field

[0001] The utility model belongs to the technical field of power adapters, and particularly relates to a push-pull quasi-resonant control module power adapter. Background Technique

[0002] An inverter is a power adapter that converts direct current into AC 220V alternating current identical to the mains power, so as to supply general electrical appliances using alternating current. It is generally used in in-vehicle power supplies, energy storage boxes, UPS power supplies, etc. Currently, inverters generally use a two-stage power conversion structure of DC-DC / DC-AC. The front stage is an isolated DC-DC boost circuit that boosts the low-voltage direct current of the battery to a high-voltage direct current bus voltage of 310 - 400V. The rear stage is a DC-AC full-bridge converter. During the front-stage boost process, different circuit designs will affect the protection function of the entire power adapter, the durability and stability of the circuit, as well as the size of the power adapter. Content of the Utility Model

[0003] The purpose of the utility model is to provide a push-pull quasi-resonant control module power adapter for the above problems. The front stage is an isolated DC-DC boost circuit, which adopts a front-stage push-pull resonant boost drive module to output complementary PWM signals for the upper and lower tubes in two-way push-pull, boosting the direct current of the battery to a high-voltage direct current bus voltage of 310 - 400V, and providing functions such as battery undervoltage shutdown, battery overvoltage shutdown, output overcurrent and short-circuit protection, and overtemperature protection.

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

[0005] A push-pull quasi-resonant control module power adapter, characterized in that: its internal circuit includes a push-pull quasi-resonant control module, and the push-pull quasi-resonant control module includes a current sampling and amplifying circuit, current-voltage and temperature protection and logic control circuit, battery voltage and temperature acquisition circuit, push-pull resonant PWM modulation output circuit and DC-DC buck circuit; the current sampling and amplifying circuit collects the sampled current of the power input bus, and after being amplified and compared by chip U3, outputs to the input pin of chip U2 of the current-voltage and temperature protection and logic control circuit at the output end; the battery voltage and temperature acquisition circuit respectively collects the voltage of the power input bus and the temperature of the storage battery, and outputs to the corresponding input pins of chip U2 of the current-voltage and temperature protection and logic control circuit; the output control end of the current-voltage and temperature protection and logic control circuit is connected to the shutdown control pin of the main control chip U1 of the push-pull resonant PWM modulation output circuit, and outputs a shutdown signal when the power input bus is overvoltage, undervoltage, overcurrent and overload of current, and the temperature of the storage battery is over-temperature; the main control chip U1 of the push-pull resonant PWM modulation output circuit outputs two-way push-pull outputs and complementary upper and lower tube PWM signals, and the PWM signals are input to the high-voltage DC bus circuit for DC boost; the DC-DC buck circuit steps down the DC voltage at the power input end and provides it to chips U1, U2 and U3 as the working voltage or reference voltage.

[0006] Further, the model of chip U1 is SG3525, and the frequency adjustment range of the output PWM signal is 40KHz - 100KHz.

[0007] Further, the model of chip U2 is HT66F302.

[0008] Further, the model of chip U3 is LM358.

[0009] Further, another output pin of chip U2 of the current-voltage and temperature protection and logic control circuit is also connected to the control end of the power supply fan to control the start, stop and speed of the fan.

[0010] The beneficial effects of the present utility model are: 1. For the push-pull quasi-resonant control module power adapter of the present utility model, a pre-stage push-pull resonant boost drive module is adopted to drive the pre-stage DC-DC boost bus circuit, boosting the DC voltage of the storage battery to a high-voltage DC bus voltage of 310 - 400V. The pre-stage push-pull resonant boost drive module provides battery undervoltage shutdown, battery overvoltage shutdown, output overcurrent and short-circuit protection, and at the same time provides complementary upper and lower tube PWM signals for two-way push-pull outputs. The module supports adjustable frequency, and the adjustable range is 40KHz - 100KHz. 2. The chip integrates and provides a perfect protection function, reducing the peripheral circuits and components, which is beneficial to saving production costs and miniaturizing the volume of the power adapter. Description of the Drawings

[0011] Figure 1 This is the principle block diagram of the present utility model.

[0012] Figure 2 This is the circuit schematic diagram of the present utility model.

[0013] In the figure, 1 is the current sampling and amplifying circuit, 2 is the current-voltage and temperature protection and logic control circuit, 3 is the battery voltage and temperature acquisition circuit, 4 is the push-pull resonant PWM modulation output circuit, and 5 is the DC-DC buck circuit. Specific embodiments

[0014] The present utility model will be further described below in conjunction with specific examples and the accompanying drawings.

[0015] Such as Figure 1 、 Figure 2As shown in the figure, a push-pull quasi-resonant control module power adapter, whose internal circuit includes a push-pull quasi-resonant control module. The push-pull quasi-resonant control module includes a current sampling and amplifying circuit 1, a current, voltage and temperature protection and logic control circuit 2, a battery voltage and temperature acquisition circuit 3, a push-pull resonant PWM modulation output circuit 4, and a DC-DC buck circuit 5. The current sampling and amplifying circuit 1 samples the current of the power input bus, and after being amplified and compared by chip U3, it outputs to the input pin of chip U2 of the current, voltage and temperature protection and logic control circuit 2 at the output end. The model of chip U3 is LM358, which contains two operational amplifiers and two comparison outputs. The battery voltage and temperature acquisition circuit 3 respectively acquires the voltage of the power input bus and the temperature of the storage battery, and outputs to the corresponding input pins of chip U2 of the current, voltage and temperature protection and logic control circuit 2. The model of chip U2 is HT66F302. The positive pole VBAT of the power input bus is connected to the input pin 6 of chip U2 through resistor R14, and the temperature signal OTP of the power input bus is connected to the input pin 7 of chip U2 through resistor R10. The output control terminal PA7 (pin 2) of the current, voltage and temperature protection and logic control circuit 2 is connected to the shutdown control pin (SHUTDOWN) of the main control chip U1 of the push-pull resonant PWM modulation output circuit 4, and outputs a SHUTDOWN shutdown signal when there is overvoltage, undervoltage, overcurrent, overload of the power input bus, and over-temperature of the storage battery temperature. The model of chip U1 is SG3525. One comparison output OUT1 of chip U3 is connected to the control pole of triode Q2 through resistor R13, the collector of triode Q2 is connected to the shutdown control pin (SHUTDOWN) of U1 through resistor R12, and the other comparison output OUT2 is connected to the input pin 5 of U2 through resistor R20. The main control chip U1 of the push-pull resonant PWM modulation output circuit 4 outputs two push-pull outputs, complementary PWM signals of the upper and lower tubes, PWM1 and PWM2, and the frequency adjustment range of the output PWM signal is 40KHz - 100KHz, and the time zone protection time is 700ns. The PWM signal is input to the high-voltage DC bus circuit for DC boost, driving the high-voltage DC bus circuit for DC boost to prepare for the subsequent inverter AC output. The DC-DC buck circuit 5 steps down the DC voltage at the power input end and provides it to chips U1, U2, and U3 as the working voltage or reference voltage.

[0016] Another output pin of chip U2 of the current, voltage and temperature protection and logic control circuit 2 is also connected to the control terminal of the power supply fan to control the start / stop and speed of the fan.

[0017] The above embodiments are only the preferred embodiments of the present utility model, and are only used to explain the present utility model, rather than limiting the present utility model. Any changes, substitutions, combinations, simplifications, modifications, etc. made by those skilled in the art without departing from the spirit and principle of the present utility model shall be equivalent replacement methods and shall be included in the protection scope of the present utility model.

Claims

1. A push-pull quasi-resonant control module power adapter, characterized in that: Its internal circuit includes a push-pull quasi-resonant control module, and the push-pull quasi-resonant control module includes a current sampling and amplifying circuit, current-voltage and temperature protection and logic control circuit, battery voltage and temperature acquisition circuit, push-pull resonant PWM modulation output circuit, and DC-DC buck circuit; the current sampling and amplifying circuit collects the sampled current of the power input bus, and after being amplified and compared by chip U3, it outputs to the input pin of chip U2 of the current-voltage and temperature protection and logic control circuit at the output end; the battery voltage and temperature acquisition circuit respectively collects the voltage of the power input bus and the temperature of the storage battery, and outputs to the corresponding input pins of chip U2 of the current-voltage and temperature protection and logic control circuit; the output control end of the current-voltage and temperature protection and logic control circuit is connected to the turn-off control pin of the main control chip U1 of the push-pull resonant PWM modulation output circuit, and outputs a turn-off signal when the power input bus is overvoltage, undervoltage, overcurrent, overload, or the storage battery temperature is over-temperature; the main control chip U1 of the push-pull resonant PWM modulation output circuit outputs two-way push-pull output and complementary upper and lower tube PWM signals, and the PWM signals are input to the high-voltage DC bus circuit for DC boost; the DC-DC buck circuit steps down the DC voltage at the power input end and provides it to chips U1, U2, and U3 as the working voltage or reference voltage.

2. The push-pull quasi-resonant control module power adapter according to claim 1, characterized in that: The model of chip U1 is SG3525, and the frequency adjustment range of the output PWM signal is 40KHz - 100KHz.

3. The push-pull quasi-resonant control module power adapter according to claim 1, characterized in that: The model of chip U2 is HT66F302.

4. The push-pull quasi-resonant control module power adapter according to claim 1, wherein: The model of chip U3 is LM358.

5. The push-pull quasi-resonant control module power adapter according to claim 1, characterized in that: Another output pin of chip U2 of the current-voltage and temperature protection and logic control circuit is also connected to the control end of the power supply fan to control the start / stop and speed of the fan.

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