The Time Controller is a single microprocessor as the core with electronic circuitry to form a power switch control device, which can control the opening and closing of home appliances in a day or week cycle and multiple hours. Suitable for all kinds of industrial appliances, automatic control of household appliances, both safe and convenient and save electricity and money.
Time settings from 1 minute to 168 hours, 1-16 groups per day, and multi-channel control. One setting is valid for a long time. The output current can be 10-25A, which can be used for normal control of 4000W to more powerful appliances. It can also be combined with relays, contactors, etc. to control various other high-power power equipment. Some high-end products also have light, and latitude and longitude control functions.
The time controller control board circuit and keyed control, LED indicator board circuit is shown in the figure, in the figure components, wire terminal number for the drawing of their own label.
The mains power is isolated by the transformer, step down, and then by D1 to D4 bridge rectification, C2 filtering, on the one hand, to provide DC operating voltage for the control circuit (12V when the control switch is on, 15V when closed). And make the LED1 light, indicating that the time control switch has been connected to the power supply; on the other hand and then by the R2 current limit, R3 voltage, VDl regulator, in C4 at both ends to form a stable voltage of 3.6V, and then by the D5 step-down, R4 current limit, for computer circuits and LCD circuits to provide 3V working power.
The included battery E guarantees no loss of data and uninterrupted computer timing in the event of a power failure, for long-term operation of LCD clocks and microcomputer circuits. D5 in the circuit acts as an isolator when the control switch is not connected to the power supply or in case of power failure, preventing the battery inside from being discharged via R3.
When the control switch is set to “automatic state”, when the computer timer reaches a set time of “on”, the computer control output (XGDZ-B board terminal 8) output nearly 3V high level, sent to XGDZ-2 board terminal ④, through the R5 drive Ql saturation, the relay coil in the current flow, normally open contacts to close, when the control switch is in “on” state. At the same time, the e5a48de588b67a686964616f31333337626233 voltage drop at both ends of the relay coil causes LED2 to light up, indicating that it is currently operating “on”.