Portable energy storage power supply circuit introduction（2）
- 著者:pro
- 公開：:2022-12-23
The output voltage and frequency of this technical solution can be adjusted, and the applicability is good. It can be adapted to electrical equipment in different countries. It is convenient to use, improves user experience, and has a simple circuit structure and is easy to implement.
Figure 1
As shown in Figure 1, a portable energy storage power supply circuit includes a DC/DC boost circuit 1, an inverter circuit 2, a processor 3, an output voltage setting circuit 4 and an output frequency setting circuit 5, and the DC/DC boost circuit The input end of 1 is used for connecting battery 6, and battery 6 can be the battery of various existing portable energy storage power sources, as lithium battery etc., can be 12V, 24V or 48V etc.
The output terminal of the DC/DC step-up circuit 1 is connected to the input terminal of the inverter circuit 2, and the output terminals of the output voltage setting circuit 4 and the output frequency setting circuit 5 are respectively connected to the input terminal of the processor 3, and the processor 3 is used for outputting the voltage according to the output voltage. The input signals of the setting circuit 4 and the output frequency setting circuit 5 correspondingly drive the switch tube of the inverter circuit 2 to output corresponding voltage and frequency.
The DC/DC boost circuit 1 includes a push-pull boost circuit and a rectifier circuit, the input terminal of the push-pull boost circuit is used to connect to the battery 6, the output terminal of the push-pull boost circuit is connected to the input terminal of the rectifier circuit, and the push-pull boost circuit The switching tubes Q15 and Q16 of the circuit are driven and controlled by the single-chip microcomputer IC6, and the output terminal of the rectification circuit is connected to the input terminal of the inverter circuit 2 . The push-pull boost circuit is adopted, the circuit structure is simple, the number of switch tubes is small, and the space occupied by the PCB is small, but it is not limited thereto. In some embodiments, other existing DC/DC boost circuits can also be used for implementation.
The inverter circuit 2 is composed of four IGBT tubes Q1-Q4, which has the advantages of low driving power and low saturation voltage, but is not limited thereto. In some embodiments, the inverter circuit 2 can also be composed of switching tubes such as MOS tubes. . The four IGBT tubes Q1‑Q4 are respectively driven and controlled by the microcontroller IC6. Please refer to Figure 2 for specific circuit connections.
The output voltage gear selection circuit includes 110V gear and 230V gear, which are suitable for the electrical equipment in most countries, but not limited thereto. In some embodiments, the number of gears of the output voltage gear selection circuit and The voltage of each gear can be set according to actual needs.
The output frequency gear selection circuit includes a 50Hz gear and a 60Hz gear, which are suitable for electrical equipment in most countries, but are not limited thereto. In some embodiments, the number of gears of the output frequency gear selection circuit and The frequency of each gear can be set according to actual needs.
figure 2
working principle:
The DC/DC step-up circuit 1 raises the voltage of the battery 6 to above 230V. When the output voltage setting circuit 4 is set to the 230V gear, the processor 3 controls the duty cycle of the IGBT tube Q1-Q4 accordingly, so that the output The AC voltage is 230V; when the output voltage setting circuit 4 is set to the 110V gear, the processor 3 will halve the duty cycle of the IGBT tube Q1-Q4 accordingly, so that the output AC voltage is 110V; when the output frequency setting circuit 5 When the gear is set to 50HZ, the processor 3 controls the driving frequency of the IGBT tube Q1‑Q4 accordingly, so that the output AC frequency is 50HZ; when the output frequency setting circuit 5 is set to the gear of 60HZ, the processor 3 increases the frequency accordingly The driving frequency of the IGBT tube Q1-Q4 makes the output AC frequency 60HZ, so that the output voltage and frequency can be adjusted, the applicability is good, and it can be adapted to the electrical equipment in different countries. It is convenient to use and improves the user experience. , and the circuit structure is simple and easy to implement.
The current monitoring module in the energy storage power supply is mainly realized by the Hall current sensor circuit.
Figure 4
CH704 is an isolated integrated current sensing chip specially developed for high current detection applications. CH704 has a built-in primary conductor resistance of 0.1mΩ, which effectively reduces chip heating and supports large current detection: ±50A, ±100A, ±150A, ±200A. It integrates a unique temperature compensation circuit to achieve good consistency in the full temperature range of the chip from -40 to 150°C. The chip is calibrated for sensitivity and quiescent (zero current) output voltage before leaving the factory, providing a typical accuracy of ±2% over the full temperature range.
The product parameters are as follows:
• Isolation voltage: 4800VRMS
• AEC-Q100 automotive qualification (CH704A)
• Power supply: 4.5-5.5V
• Output voltage proportional to current: +/-50A, +/-100A, +/-150A, +/-200A
• Bandwidth: 120kHz
• Response time: 2us
• Wide temperature range: -40°C to 150°C
• High resolution offset and sensitivity adjustment using EEPROM
• Lead resistance: 0.1 mΩ
• Integrated digital temperature compensation circuit
• Almost zero hysteresis
• Ratiometric output of supply voltage
• Resistance to external magnetic fields
