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Microprocessor controlled AC switch circuit

A technology for controlling circuits and microprocessors, applied to circuits, electronic switches, relays, etc., to achieve the effects of simplified circuits, simple structures, and low energy consumption

Inactive Publication Date: 2003-10-15
王稳忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention solves the problems caused by the AC switching circuit used in the existing electrical equipment, especially household appliances, by using transformer rectification power supply or switching power supply, and provides a device that can truly isolate the electrical equipment from the AC power in the standby state. and small microprocessor-controlled AC switching circuit

Method used

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Embodiment 1

[0016] In this embodiment, the microprocessor-controlled AC switching circuit of the present invention is used in a color TV.

[0017]The AC switching circuit controlled by the microprocessor includes a DC power supply circuit including a rectification circuit and a voltage stabilizing circuit and a control circuit of a DC operating AC relay. The AC input terminal of the rectifier circuit is connected in series with a reactance formed by parallel connection of resistors and capacitors, and the two AC input terminals of the rectifier circuit are connected in series with resistors R2, capacitor C2, resistor R3, and capacitor C3 in parallel. Reactance (in this way, it is beneficial to connect the rectification and voltage stabilizing circuit with other circuits in the color TV. When one end of the AC power supply is connected to the circuit in the color TV with low resistance, the reactance on the two AC input ends plays an isolation role. , to avoid burning the rectifier and vol...

Embodiment 2

[0027] In this embodiment, the microprocessor-controlled AC switch circuit of the present invention is used in a refrigerator. Since the compressor of the refrigerator has a starting coil and a running coil, the AC switch circuit has two DC-operated AC relay control circuits with the same structure, which are respectively connected to the two ends of the AC power supply to control the starting coil and the common input of the two coils. On and off of the AC power supply at the terminal.

[0028] Since the starting coil of the compressor is only energized during the starting process, only the running coil is energized after the starting process is completed. Therefore, the DC-operated AC relay control circuit that controls the starting coil and the common input of the two coils cannot be closed synchronously. , the DC-operated AC relay control circuit controlling the starter coil must be closed to stop supplying power to the starter coil, thus, the control signal of the non-inv...

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Abstract

The microprocessor controlled AC switch circuit includes DC power source circuit and AC relay-operating DC control circuit. Both the DC power source circuit and the AC relay-operating DC control circuit have impedance comprising parallelly connected resistor and capacitor in their input; and the AC relay-operating DC control circuit has also relay circuit. The present invention is simple and reasonable in structure, has no transformer and may be produced into small circuit module for easy installation on household electric equipment. The AC switch circuit can turn off AC power radically and has mW level power consumption after the electric equipment is turned off. The AC switch circuit may be used in color TV set for true remote AC off.

Description

technical field [0001] The invention relates to a circuit structure, in particular to an AC switch circuit controlled by a microprocessor. Background technique [0002] There are a large number of AC switching circuits of various structures on various electrical equipment, especially various household appliances (such as color TVs, refrigerators, air conditioners, etc.), to realize the on-off and conversion control of various electrical devices ( Such as automatic start-up and shutdown of remote control color TV, control of rotation and stop of refrigerator compressor, switch control of solenoid valve, control of forward rotation, reverse rotation and stop of fan of air conditioner). Most of these AC switching circuits use DC relays as electrical switching components, that is, the electromagnetic coils of the relays are driven by DC and controlled by electronic circuits, while the contacts of the relays are connected with the AC power supply circuit to control the on and off...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H47/02H03K17/72H03K17/79
Inventor 王稳忠
Owner 王稳忠
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