Adaptive control circuit and arithmetic logic method for alternating-current power supplies of different voltage classes

Abstract

The invention discloses an adaptive control circuit and arithmetic logic method for alternating-current power supplies of different voltage classes. The circuit comprises a single-phase alternating-current power supply, a single-phase rectifying circuit, at least two series electrolytic capacitor banks and series electrolytic voltage balancing resistor banks forming a group, a direct-current voltage detection circuit, an alternating-current voltage detection circuit, a voltage doubling switch, a voltage doubling switch control circuit and a CPU for control, wherein the alternating-current voltage detection circuit is arranged at the alternating-current input side of the circuit, meanwhile, the direct-current voltage detection circuit is arranged on the direct-current side, and finally, thevoltage doubling switch and the voltage doubling switch control circuit are arranged on the rectifying circuit side; the CPU for control carried in the circuit detects an alternating-current voltagevalue and a direct-current voltage value at the same time; and the voltage doubling switch is controlled through logic operation so as to ensure that the direct-current voltage obtained through rectification is maintained in a preset working voltage range when different alternating-current voltage classes are input, thereby providing a stable direct-current power supply voltage for post-stage output.

Description

technical field [0001] The invention relates to the field of circuit design of an AC power supply, in particular to an adaptive control circuit and an operation logic method of an AC power supply with different voltage levels. Background technique [0002] Generally, AC power supply has multiple voltage modes. For example, the AC power supply in my country has single-phase 220V and three-phase 380V, and the AC power supply in the United States has single-phase 115V and single-phase 230V. When designing general electrical appliances, corresponding circuit design must be carried out in advance for AC power sources of different voltage levels, but after the voltage level of the power supply changes, the electrical appliances themselves cannot adapt to the change in voltage level. [0003] In order to solve this problem, some electrical appliances are designed to artificially specify the voltage level of the AC power supply by means of switches, dials or jumpers, so as to achiev...

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Problems solved by technology

[0004] However, this method is not only cumbersome to use, but also has great potential safety hazards.

When the input AC 110V level voltage is specified, if the electrical appliance is connected to 220V AC, the DC voltage of the rear-stage circuit inside the electrical appliance will be too high, which will break down and damage the circuit components. ACCIDENT

And when the input AC level of 220V is specified, if the electrical appliance is connected to 110V AC, the electrical appliance will also cause various problems such as lack of working voltage, insufficient power, severe heat and even fire due to insufficient voltage of the internal post-stage circuit.

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