Anti-jamming photoswitch switch circuit for street lamp
A switching circuit and lighting technology, applied in the electronic field, can solve problems such as switch jitter, and achieve the effect of avoiding switch jitter
Inactive Publication Date: 2017-05-10
GUANGXI UNIV
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Problems solved by technology
[0003] The purpose of the present invention is to provide an anti-interference street light control switch circuit to solve the problem that the existing street light control switch circuit is prone to switch vibration when the illuminance exceeds the threshold
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[0010] The present invention will be further described below with reference to the accompanying drawings.
[0011] like figure 1 As shown, the anti-interference street light control switch circuit of the present invention uses photoresistor RG, time base circuit NE555 chip, electronic switch TWH8778 and relay K to control the street light power supply line; wherein the L line and N line of the 220V mains are connected to Enter the two ends of the primary coil of the transformer T1. After the 220V mains is stepped down by the transformer T1, bridge rectified by the diodes D1~D4, and filtered by the capacitor C1, the positive and negative ends of the capacitor C1 form the DC 12V power supply terminal and the ground respectively. The terminal supplies power to the post-stage circuit; in the post-stage circuit, the 12V power supply is connected to one end of the photoresistor RG, the 4th and 8th pins of the NE555 chip, the 1st pin of the electronic switch TWH8778, and the other en...
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The invention provides an anti-jamming photoswitch switch circuit for a street lamp. A power supply line of the street lamp is controlled by adopting a photo-resistor RG, a time-base circuit NE555 chip, an electronic switch TWH8778 and a relay K. A schmitt trigger is built by adopting the NE555 chip, backlash voltage exits in an on-off state turnover point, on-off state turnover has two upper and lower thresholds, when the illuminance exceeds the thresholds, the street lamp automatically lights on or lights off, and the photoswitch switch circuit does not generate the on-off state turnover as long as a voltage change generated by a sudden change of the illuminance due to the fact that the street lamp lights on or lights off is limited within a range of the backlash voltage, therefore, according to the photoswitch switch circuit for the street lamp, a switch chattering phenomenon generated when the illuminance exceeds the thresholds of a conventional photoswitch switch circuit for the street lamp can be effectively avoided; and furthermore, the circuit at a trigger end of the schmitt trigger is connected with a bypass capacitor over the ground in parallel, so that the photoswitch switch circuit for the street lamp can play filter anti-jamming role on an input signal.
Description
technical field [0001] The invention relates to a street light control switch circuit, in particular to an anti-interference street light control switch circuit, which belongs to the technical field of electronics. Background technique [0002] In order to realize automatic switching of lights, the current street lights are generally equipped with a light-controlled switch circuit, that is, the external light is monitored through a photoresistor, and the resistance value of the photoresistor changes with the change of illuminance, and the control circuit is based on the resistance value of the photoresistor. The change sets a threshold of illuminance. When the illuminance is lower than the threshold, the control circuit controls the street lamp to automatically light up, and when the illuminance is higher than the threshold, the control circuit controls the street lamp to automatically turn off. However, when the illuminance just crosses the threshold and causes the light-co...
Claims
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IPC IPC(8): H05B37/02
CPCH05B47/11Y02B20/40
Inventor 龙邹
Owner GUANGXI UNIV