Analysis of Relay Usage Method in Video Surveillance Decoder
2023-06-15 09:08:43
A relay, also called a power switch, is an electronic control device. It has a control system (also called an input circuit) and a controlled system (also called an output circuit). Usually used in an automatic control circuit, it is actually An "automatic switch" that uses a smaller current to control a larger current.
In the decoder, the relay is a motion generator. Usually the decoder will match nine relays, among which there are five larger relays that control the pan and tilt and left and right movements, and the remaining four smaller relays control the three variable lens apertures, zooming, and focusing.
Panasonic, ohms and other relays are first-class products, but the price is higher, usually used in access control areas. There are more than two brands of relays used in surveillance decoders. Songle and Huigang have little difference in quality. In actual use, the failure rate of relays is not high, and I personally think that they are basically negligible.
However, when the decoder is working, the relay must be opened and closed frequently, and an instantaneous current passes through each time the switch is opened and closed. If the relay capacity is too small, the instantaneous current may exceed the capacity of the relay, the service life of the relay will be greatly shortened, must use the relay of rated operating current above 7A, and some manufacturers choose the small relay of 1A to pursue the cost too.
There is also a problem to be aware of, some decoders are designed to cancel the lens control of the three relays, replaced with transistors and resistors, this design is not high failure rate in use, basically within the normal range, but I personally hold With reservations in mind, the triode's drive capability is limited and may be unstable when used in a relatively complex environment.
In the decoder, the relay is a motion generator. Usually the decoder will match nine relays, among which there are five larger relays that control the pan and tilt and left and right movements, and the remaining four smaller relays control the three variable lens apertures, zooming, and focusing.
Panasonic, ohms and other relays are first-class products, but the price is higher, usually used in access control areas. There are more than two brands of relays used in surveillance decoders. Songle and Huigang have little difference in quality. In actual use, the failure rate of relays is not high, and I personally think that they are basically negligible.
However, when the decoder is working, the relay must be opened and closed frequently, and an instantaneous current passes through each time the switch is opened and closed. If the relay capacity is too small, the instantaneous current may exceed the capacity of the relay, the service life of the relay will be greatly shortened, must use the relay of rated operating current above 7A, and some manufacturers choose the small relay of 1A to pursue the cost too.
There is also a problem to be aware of, some decoders are designed to cancel the lens control of the three relays, replaced with transistors and resistors, this design is not high failure rate in use, basically within the normal range, but I personally hold With reservations in mind, the triode's drive capability is limited and may be unstable when used in a relatively complex environment.
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