Wireless switching circuit
A wireless switching circuit includes a charging capacitor, a voltage converter, an infrared sensor unit, a single chip microcomputer (SCM), a zero trigger circuit, and a thyristor. The charging capacitor is used to store and supply power. The voltage converter is used to convert alternating current (AC) voltage into direct current (DC) voltage to charge the charging capacitor. The infrared sensor unit is used to output control signals according to sensed infrared signals. The SCM outputs a trigger signal according to the control signals from the infrared sensor unit. Input ends of the zero trigger circuit are connected to the SCM to receive the trigger signal. An anode and a cathode of the thyristor is connected to a power supply line for the socket. A control end of the thyristor is connected to an output end of the zero trigger circuit.
1. A wireless switching circuit, comprising:
a charging capacitor;
a voltage converter connected to the charging capacitor;
a switch connecting the voltage converter to an alternating current (AC) power source;
wherein the voltage converter converts AC voltage from the AC power source into direct current (DC) voltage to charge the charging capacitor when the switch is turned on;
an infrared sensor unit to output a power signal or a standby signal according to infrared signals sensed by the infrared sensor unit;
a single chip microcomputer (SCM) connected to the infrared sensor unit and the charging capacitor, wherein the SCM outputs a trigger signal when receiving the power signal from the infrared sensor and stops outputting the trigger signal when receiving the standby signal from the infrared sensor;
a zero trigger circuit connected to the SCM, wherein input ends of the zero trigger circuit are connected to the SCM to receive the trigger signal;
a triac connected to a socket, wherein an anode of the triac is connected to a zero line of the AC power source, a cathode of the triac is connected to the anode of the triac through the switch; a control end of the triac is connected to an output end of the zero trigger circuit; when the zero trigger circuit receives the trigger signal from the SCM, the triac is turned on, and the AC power source is connected to the socket; when the zero trigger circuit does not receive the trigger signal from the SCM, the triac is turned off, and the AC power source is disconnected from the socket;
wherein the voltage converter has a first input, connected between the switch and a first end of the socket, and a second input connected between a second end of the socket and the zero line of the AC power source; and
wherein the switch is connected in parallel with the triac.
2. The wireless switching circuit of claim 1 , further comprising a diac, wherein the diac is connected between the zero trigger circuit and the triac.
3. The wireless switching circuit of claim 2 , further comprising a resistor and a filter capacitor, where in the resistor and the filter capacitor are connected in series, and connected to the switch in parallel.
4. The wireless switching circuit of claim 3 , further comprising a fuse, wherein the fuse is connected to a live line of the AC power source and connected to the anode of the triac.