Description
Overview of high-power power delay soft start board:
1. Onboard industrial sealed transformer power supply design, standby power consumption is O.
2.2 Only 30A high current relay control, the power switch only needs 10MA to control 2000W electrical equipment.
3.4 Thermistors are used as starting load to reduce the starting impulse current.
4. The delay circuit circuit is a transistor capacitance delay, and the resistance and capacitance parameters can be adjusted to change the delay time.
5. Reserve 2 temperature control switches. When not in use, you need to short-circuit the two temperature switches.
6. When the designed LED lights up, it represents normal power supply.
performance:
1、Working voltage: AC 220V
2、Power-on delay: about 3S (3 seconds)
3、Starting current limit: about 3.5A
4、Board size: length 85mm, width 70mm, height 28MM, net weight: 186g
5、Protection category: start-up delay voltage reduction and current limiting protection.
Remarks:
1. The soft start of the transformer + 2 relay structure has the advantage of safety, o standby power consumption, using transformer power supply, performance is more stable and reliable than capacitor power supply. The disadvantage is that the cost is high and it takes up space.
2. The power switch selection requires a 220V AC self-locking switch, and the current is greater than 10MA.
3. Two temperature control switches are reserved on the board. This switch needs to be a long-close temperature switch. The voltage on this circuit is 12V DC and the current is 20MA. If no temperature switch is added, the two temperature switches need to be short-circuited.
4. This circuit board is connected to AC 220V, which requires professional electricians to operate. High voltage danger! ! !
Circuit principle, turn on the power (standby with zero power consumption) — the power switch is turned on — the on-board transformer works, the rectified and filtered output DC powers the relay 1 through the temperature switch-the relay 1 is closed-power delay String NTC start (delay circuit control)—–start complete short-circuit NTC (relay 2 controls 220V voltage output)—power switch off—transformation power off—relay off—total power off Turn on and enter standby (0 power consumption). In the working process, if the temperature switch is turned off, the relay will be turned off, and after the temperature switch is turned on, the soft start process will be repeated once
