Pure sine wave inverter control module power adapter

Abstract

The utility model discloses a pure sine wave inverter control module power adapter. An internal circuit of the pure sine wave inverter control module power adapter comprises a current sampling and overcurrent protection circuit, an output voltage waveform sampling correction and SPWM modulation signal output and protection circuit, a four-path full-bridge drive control output circuit, a four-path full-bridge inverter circuit and a transformer conversion circuit. The output voltage waveform sampling correction and SPWM modulation signal output and protection circuit samples an AC output voltage and adjusts an output signal; and the four-path full-bridge drive control output circuit comprises a drive control chip for providing drive control signals for the four-path full-bridge inverter circuit. The power supply outputs pure sine waves, adopts a current mode and a center alignment SPWM modulation mode, is internally provided with four paths of high-voltage full-bridge driving, and samples and corrects output voltage waveforms, so that the output quality of the power supply is ensured; the main chip is integrated and provides a perfect protection function, and peripheral circuits and components are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of power adapter technology, specifically relating to a power adapter for a pure sine wave inverter control module. Background Technology

[0002] An inverter-type power adapter is a power adapter that can convert DC 12V / DC 24V direct current into AC 220V alternating current, the same as the mains power, to power general electrical appliances that use AC power. It is a convenient power converter and is generally used in vehicle power supplies, energy storage boxes, and UPS power supplies. Current inverter-type power adapters generally use a modified sine wave switching inverter mode, which uses PWM pulse width modulation to generate a modified wave output. In the inverter process, although it can reduce the power loss of the system, its output sine wave characteristics are not very good. Especially for some precision equipment with high power quality requirements, it cannot guarantee the stable operation of precision equipment. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned problems by providing a pure sine wave inverter control module power adapter. The power adapter outputs a pure sine wave and uses current mode, center-aligned SPWM modulation to drive the high-voltage full bridge to complete the inverter. It also has functions such as short circuit, overload, overcurrent and over-temperature protection.

[0004] This utility model is achieved through the following technical solution:

[0005] A pure sine wave inverter control module power adapter, its internal circuitry includes a current sampling and overcurrent protection circuit, an output voltage waveform sampling correction and SPWM modulation signal output and protection circuit, a four-channel full-bridge drive control output circuit, a four-channel full-bridge inverter circuit, and a transformer conversion circuit. The output voltage waveform sampling correction and SPWM modulation signal output and protection circuit includes a main control chip IC4, model HT45F5V, which is connected to both the DC current input circuit and the AC output terminal. It samples the AC output voltage and adjusts the output signal to correct the output voltage. The IC4 chip internally includes an oscillator, as well as overvoltage and undervoltage protection, and short-circuit, overload, overcurrent, and overtemperature protection circuits. The four-channel full-bridge drive control output circuit includes two circuits for providing drive control signals to the four-channel full-bridge inverter circuit. The drive control chips IC6 and IC7 are both model EG2113D. The main control chip IC4 provides SPWM modulation input signals to the drive control chips IC6 and IC7 respectively. The drive control chips IC6 and IC7 control the four-channel full-bridge inverter circuit to output sinusoidal AC power, which is then boosted to AC voltage by the transformer conversion circuit. The current sampling and overcurrent protection circuit includes a dual voltage comparison integrated chip IC5, which is connected to the main control chip IC4. It obtains the load voltage value from the main control chip IC4, and through voltage comparison, outputs control signals to the main control chip IC4, the drive control chips IC6 and IC7 respectively when the voltage exceeds the reference voltage range, thereby controlling the main control chip IC4, the drive control chips IC6 and IC7 to shut down the output.

[0006] Furthermore, the current sampling and overcurrent protection circuit, the output voltage waveform sampling correction and SPWM modulation signal output and protection circuit, and the four-way full-bridge drive control output circuit form a modular structure, and interfaces are provided with the DC current input circuit, the AC output terminal, and the four-way full-bridge inverter circuit.

[0007] Furthermore, the main control chip IC4 is equipped with a Flash program programming port.

[0008] Furthermore, the main control chip IC4 is also connected to an LED working indicator light.

[0009] Furthermore, the model number of the chip IC5 is LM393.

[0010] The beneficial effects of this utility model are as follows: 1. The pure sine wave inverter control module power adapter of this utility model outputs a pure sine wave power supply. It adopts a current-mode, center-aligned SPWM modulation method, has a built-in four-channel high-voltage full-bridge driver, and samples and corrects the output voltage waveform to ensure the quality of power output. 2. The main chip integrates and provides comprehensive protection functions, including input bus voltage overvoltage and undervoltage protection, short circuit, overload, overcurrent, and overtemperature protection and indication functions, reducing the number of external circuits and components. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the principle of this utility model.

[0012] Figure 2 This is the circuit schematic diagram of the first part of this utility model.

[0013] Figure 3 This is the circuit schematic diagram of the second part of this utility model.

[0014] In the diagram, 1 is the current sampling and overcurrent protection circuit, 2 is the output voltage waveform sampling correction and SPWM modulation signal output and protection circuit, and 3 is the four-channel full-bridge drive control output circuit. Detailed Implementation

[0015] The present invention will be further illustrated below with reference to specific examples and accompanying drawings.

[0016] like Figures 1-3As shown, a pure sine wave inverter control module power adapter includes an internal circuit comprising a current sampling and overcurrent protection circuit 1, an output voltage waveform sampling correction and SPWM modulation signal output and protection circuit 2, a four-channel full-bridge drive control output circuit 3, a four-channel full-bridge inverter circuit, and a transformer conversion circuit. The output voltage waveform sampling correction and SPWM modulation signal output and protection circuit 2 includes a main control chip IC4, model HT45F5V. The chip IC4 is connected to the DC current input circuit and the AC output terminal, respectively, to sample the AC output voltage and adjust the output signal to correct the output voltage. The AC- and AC+ pins of the chip IC4 are connected to the AC output terminals AC-L and AC-N, respectively, and the TX and RX pins of the chip IC4 are connected to the DC current input terminal, respectively. The IC4 chip internally includes an oscillator, as well as overvoltage and undervoltage protection, and short-circuit, overload, overcurrent, and overtemperature protection circuits. The four-channel full-bridge drive control output circuit 3 includes two drive control chips, IC6 and IC7, for providing drive control signals to the four-channel full-bridge inverter circuit. Both drive control chips IC6 and IC7 are model EG2113D. The main control chip IC4 provides SPWM modulation input signals to the drive control chips IC6 and IC7 respectively. The AUO and ABO output pins of the main control chip IC4 are connected to the HIN and LIN pins of the drive control chip IC6, respectively. The BUO and BBO output pins of the main control chip IC4 are connected to the HIN and LIN pins of the drive control chip IC7, respectively. The drive control chip IC6 connects to the control terminals of two switching transistors in the four-channel full-bridge inverter circuit at its HO and LO pins, respectively. The drive control chip IC7 connects to the control terminals of the other two switching transistors in the four-channel full-bridge inverter circuit at its HO and LO pins, respectively. The drive control chips IC6 and IC7 control the four-way full-bridge inverter circuit to output sinusoidal AC power, which is then boosted to AC voltage by the transformer conversion circuit. The current sampling and overcurrent protection circuit 1 includes a dual voltage comparison integrated chip IC5, model LM393. The chip IC5 is connected to the COP1 pin of the main control chip IC4, obtains the load voltage value from the main control chip IC4, and outputs control signals to the main control chip IC4, the drive control chips IC6 and IC7 respectively after voltage comparison if the voltage exceeds the reference voltage range. One output pin OUT1 of the chip IC5 is connected to the INT pin of the main control chip IC4 to control whether the main control chip IC4 performs overcurrent protection. The other output pin OUT2 of the chip IC5 is connected to the logic input SD of the drive control chips IC6 and IC7 respectively. When the drive control chips IC6 and IC7 receive a high level at the SD pin, they turn off the output of the HO and LO pins.

[0017] The current sampling and overcurrent protection circuit 1, the output voltage waveform sampling correction and SPWM modulation signal output and protection circuit 2, and the four-channel full-bridge drive control output circuit 3 form a modular structure, and are equipped with an interface J6 for the DC current input circuit, AC output terminal, and four-channel full-bridge inverter circuit, facilitating assembly and disassembly. The main control chip IC4 has Flash program programming ports OCDSDA and OCDSDCK, both of which are connected to terminal block J5. A working indicator LED3 and resistor R87 are connected between pin PA1 and +5VB of the main control chip IC4.

[0018] The above embodiments are merely preferred embodiments of the present utility model and are only used to explain the present utility model, not to limit 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 considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A power adapter for a pure sine wave inverter control module, characterized in that: Its internal circuitry includes a current sampling and overcurrent protection circuit, an output voltage waveform sampling correction and SPWM modulation signal output and protection circuit, a four-channel full-bridge drive control output circuit, a four-channel full-bridge inverter circuit, and a transformer conversion circuit. The output voltage waveform sampling correction and SPWM modulation signal output and protection circuit includes a main control chip IC4, model HT45F5V. IC4 is connected to both the DC current input circuit and the AC output terminal, sampling the AC output voltage and adjusting the output signal to correct the output voltage. IC4 internally includes an oscillator, as well as overvoltage and undervoltage protection, and short-circuit, overload, overcurrent, and overtemperature protection circuits. The four-channel full-bridge drive control output circuit includes two drive control chips I for providing drive control signals to the four-channel full-bridge inverter circuit. C6 and IC7, the drive control chips IC6 and IC7 are both model EG2113D; the main control chip IC4 provides SPWM modulation input signals to the drive control chips IC6 and IC7 respectively, the drive control chips IC6 and IC7 control the four-way full-bridge inverter circuit to output sinusoidal AC power, and then the AC voltage is boosted by the transformer conversion circuit; the current sampling and overcurrent protection circuit includes a dual voltage comparison integrated chip IC5, the chip IC5 is connected to the main control chip IC4, obtains the load voltage value from the main control chip IC4, and outputs control signals to the main control chip IC4, the drive control chips IC6 and IC7 respectively after the voltage exceeds the reference voltage range, thereby controlling the main control chip IC4, the drive control chips IC6 and IC7 to shut down the output.

2. The power adapter for the pure sine wave inverter control module according to claim 1, characterized in that: The current sampling and overcurrent protection circuit, the output voltage waveform sampling correction and SPWM modulation signal output and protection circuit, and the four-way full-bridge drive control output circuit form a modular structure, and interfaces are provided with the DC current input circuit, the AC output terminal, and the four-way full-bridge inverter circuit.

3. The power adapter for the pure sine wave inverter control module according to claim 1, characterized in that: The main control chip IC4 is equipped with a Flash program programming port.

4. The power adapter for the pure sine wave inverter control module according to claim 1, characterized in that: The main control chip IC4 is also connected to an LED indicator light.

5. The power adapter for the pure sine wave inverter control module according to claim 1, characterized in that: The model number of the chip IC5 is LM393.

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