Design of voltage regulation and timing dual-purpose controller

This is a voltage regulation and timing dual-purpose controller with simple circuit, easy production and convenient use. Its indicators are: voltage regulation range 30-215V AC, timing 5-60 minutes, power 500W. It can regulate voltage (dimming, temperature adjustment, speed adjustment) or time off various household appliances. (Tip: The "voltage regulation" function must not be used for appliances using switching power supplies! Such as computers, color TVs, mobile phone chargers, etc.)
Working principle The circuit principle of this dual-purpose controller is shown in Figure 1 (click to download the schematic diagram). When the voltage regulation and timing selection switch S2 is set to 1, NE555 and S, C3, RP2 and VS form a timing control circuit. When in use, press AN, C3 quickly discharges through R2 and AN. At this time, the ② and ⑥ terminals of NE555 are high level, the ③ terminal outputs low level, the bidirectional thyristor VS is turned on, and the output socket CZ has voltage output. The DC power supply charges C3 through RP2 and R3. After C3 is fully charged, the voltage of terminals ② and ⑥ of NE555 is reduced to 1/3 of the DC power supply voltage. At this time, NE555 is set, terminal ③ outputs a high level, VS is cut off, and CZ has no voltage output. When switch S is set to 2, NE555 and RP1, R1, C2, etc. form a trigger pulse generation circuit. Terminal ③ of NE555 outputs a trigger pulse with a frequency of about 13Hz and an adjustable duty cycle. Adjusting RP1 can change the width of the trigger pulse, and then use the pulse to control the conduction angle of VS, so that the output voltage on CZ changes with the change of the conduction angle, thereby achieving the purpose of voltage regulation. The role of VD1 is to keep the oscillation period unchanged when adjusting RP1, while changing the trigger pulse width. C5, VDW, and VD2 form a step-down and rectifier circuit to provide NE555 with a DC working voltage of about 12V. C5 is a step-down capacitor. R2 and R4 are current limiting resistors. Component selection and production See the table below for the component list.

serial number	name	model	quantity
R1	resistance	47K	1
R2	resistance	100Ω	1
R3	resistance	100K	1
R4	resistance	470Ω	1
RP1	Potentiometer	1M Linear Potentiometer	1
RP2	Potentiometer	3.3M Linear Potentiometer	1
C1	Electrolytic Capacitors	470uF	1
C2	Polyester capacitor	0.1u	1
C3	Electrolytic Capacitors	1000uF	1
C4	Polyester capacitor	0.01u	1
C5	Metallized capacitors	0.47uF Withstand voltage ≥400V	1
VD1	Switching diode	IN4148	1
VD2	Rectifier diode	IN4007	1
VDW	Zener diode	12V	1
VS	Bidirectional thyristor	3A　600V	1
IC	Time base circuit	NE555	1
S	Transfer switch	1×2 small toggle switch	1
CZ	Power outlet	10A　250V	1

RP2 is used to adjust the timing time. After installation, the scale can be marked on the shell according to the relationship between time and angle. After
the dual-purpose controller is installed, as long as the genuine components that meet the requirements are selected and installed correctly, it can generally work normally without debugging.