Multi-function radio remote control electric fan circuit diagram using TWH923619238

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The wireless remote controller of the electric fan introduced in this example adopts a 4-position remote control module and a fan speed control integrated circuit, which can transform the ordinary electric fan into a radio remote control multi-function speed regulating fan.

Working principle The schematic diagram of the fan receiving part of the wireless remote control governor of the electric fan is shown in Figure 1. The transmitting part is a 4-digit TWH9236 key chain transmitter. Its A key is used for wind speed (SPEED) adjustment, B key is for wind type (MODE) adjustment, C key is for timing (TIME) setting, D key is for OFF (OFF) ).

In the figure, IC1 is the TWH9238 receiving module corresponding to the TWH9236 remote control transmitter. The four pins A, B, C, and D are in one-to-one correspondence with the A, B, C, and D buttons on the transmitter.

IC3 is an LC901 electric fan speed control ASIC. Its 1, Q, 14 and 5 feet are the wind speed (SPEED), wind (MODE), timing (TIME), OFF (OFF) control setting, low power The flat trigger is valid. When 1 foot is repeatedly triggered by low level, the wind speed is strong wind (S) ~ stroke (M) ~ weak wind (L) a strong wind (S) ~ ..., 11 feet for strong wind output S, 12 feet for stroke output The terminals M and 13 are weak wind output terminal L, and the effective output is high level, respectively triggering the driving bidirectional thyristor VTH1-VTH3 to make it conduct, and the electric fan M obtains different voltages through the reactor L to realize the speed regulation. purpose. The VL6V ratio is a strong wind, a stroke, and a weak wind indicator. When the 5 feet are triggered by the low level, the 11-13 feet have no output, the electric fan stops, and the chip is in a stationary state, that is, it is turned off. In the off state, the 1 pin doubles as the start end, which can start the electric fan. The 15-pin is triggered by a low level, which allows the wind to switch between normal wind and natural wind. VI5 is a wind-type indicator light. When it is off, it is normal wind, and when it is flashing, it is natural wind. When the 14-pin is repeatedly triggered by a low level, the circuit can be placed in an indefinite-0. 5h- 1 h-2h-4h is an irregular one..., VU-VL4 connected by 7-10 feet are 4h, 2h, lh, 0 respectively. 5h timing indicator light.

Since the valid output of the TWH9238 (IC1) data output is high, it is inverted by the inverter inverting to trigger the 1, 15, 14, and 5 of IC3, respectively. D4 buttons can easily control the wind speed, wind, timing and shutdown of the fan.

Component selection ICl and transmitter use TWH9236/9238 series radio transmitting and receiving module produced by Guangdong Zhongshan Dahua Electronics Factory; 4 inverters of IC2 can choose any 4 of CD4069 six-inverter digital integrated circuits Inverter, the other two unused inverters should be grounded at their input terminals without being left floating, eliminating unnecessary interference. IC3 selects LC901 electric fan speed control ASIC. VTH1 - VTH3 can be used in MAC97A6 (IA/600V) small plastic package bidirectional thyristors. VS selects 0.5W, 6V Zener diodes, such as 1N5233, 2CW21 C and other models.

L can be used in the mechanical governor of the electric fan. The general mechanical governor has 5 speeds. Now there are only 3 speeds, so it is necessary to vacate the coils with 2 taps.

C3 requires the use of CBB/3-400V polypropylene capacitors.