Working points of AC constant current source
AC constant current source High speed channel and interrupt with circuit control switch. Direct current is converted into high-frequency alternating current, which is input into the transformer for voltage transformation to generate one or more necessary groups of voltages!
The efficiency of high-frequency AC in the transformer circuit is much higher than 50Hz. Therefore, the switching transformer may be small and will not be too hot during operation. The cost is very low. It is meaningless if 50Hz is not changed to high-frequency AC constant current source.
AC constant current source Classification: insulation type and non insulation type. Switch transformers are required for the isolated type, but not necessarily for the non insulated type.
AC constant current source How the works:
1. The input of AC power supply is DC through rectifier filter.
2. The switch tube is controlled by a high frequency PWM (pulse width modulation) signal and adds DC to the initial side of the switching transformer.
3. The secondary side of the switching transformer generates a high-frequency voltage, which is filtered into the load through rectification.
4. The output part feeds back to the control loop through a specific loop to control the PWM occupancy and realize stable output.
When AC power is input, in order to eliminate the interference to the power grid, the interference to the power grid is usually eliminated.
With the same power, the higher the switching frequency, the smaller the capacity of the switching transformer, but the higher the requirements for the switching tube.
Multiple windings can be used on the secondary side of the switching transformer, or multiple taps can be used on one winding to obtain the required output.
It is usually necessary to add no-load, short-circuit protection and other protection circuits. Otherwise,AC constant current source It may burn.
Multiple windings can be used on the secondary side of the switching transformer, or multiple taps can be used on one winding to obtain the required output.
It is usually necessary to add no-load, short-circuit protection and other protection circuits. Otherwise,AC constant current source It may burn.
It is mainly used in industry and some household appliances, such as TV and computer.
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