1KW pure sine wave inverter power supply DCDC transformer design-EEWORLD

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This is a sine wave inverter power module with complete protection functions. It adopts a two-stage power conversion architecture of DC/AC/power frequency transformer. The full-bridge DC/AC circuit converts 24V (12V and 48V are also available) DC voltage into AC (24*DC voltage utilization rate/1.414)V AC, and then the power frequency transformer converts the inverted AC into AC220V 50Hz standard AC. The DC/AC part of the module is controlled by the HT1112 chip, and the module adopts the input and output isolation solution.

1. a) DC/AC part of inverter power module

Switch tube standing:

The switch tube is under the board:

Heat sink size: 277mm, 120mm

Note: The board is 230mm long and 120mm wide. Each switch part of the full bridge is composed of four switch tubes in parallel, a total of 16 MOS tubes.

b) Power frequency transformer

Power frequency transformer parameters 24V input ratio 13/230

II. a) Input rated voltage: DC24V

Note: This board can also be used for input voltage DC12V, DC48V, and the input rated current is 50A.

This is only tested at 24V.

b) Input rated DC current 50A

c) Undervoltage protection: DC 21V

d) Overvoltage protection: DC 30V

3. a) Output rated current: 4.55A

b) Output voltage: AC220V

c) Output frequency: 50Hz (can be adjusted according to user requirements)

The data measured under the frequency transformer are as follows:

The no-load THD is 1.2%, and the current THD is 2.4% when fully loaded.

The 1KW power is only for verifying the chip. If the power is higher than 1KW or higher, the efficiency will be higher. And the efficiency is closely related to the performance of the transformer. What is the highest efficiency? It will be verified by friends who make the whole machine!! (Please indicate the source if you reprint the original from Power Network)

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