CN202353535U - Energy-saving self-extinguishing switch - Google Patents

Abstract

The utility model relates to an energy-saving self-extinguishing switch suitable for public parts of houses and other buildings requiring transient lighting. It includes a full-wave bridge rectifier circuit composed of D1, D2, D3, D4, and also includes the upper end of the button K, resistors R1, R2, R3, R4 unidirectional thyristor SCR, and triodes T1, T2. The advantages of this energy-saving self-extinguishing switch are that the button time is short, the lighting time is long, the capacitance is small, the withstand voltage requirement is low, the action is stable and reliable, and the panel display light is consistent with the switch control circuit.

Description

Energy-saving self-extinguishing switch

Technical field

The utility model relates to an electronic time-delay switch, in particular to an energy-saving self-extinguishing switch suitable for public housing and other buildings that require transient lighting. the

Background technique

The existing button-type electronic time-delay switch usually uses the charging and discharging of the capacitor to realize the time-delayed self-extinguishing. The disadvantages of this switch are: 1. If the button is pressed for a short time, the lighting time often cannot reach the delay time set by the design (usually 1-3 minutes). If the button needs to be pressed for a long time ( several seconds), then bring inconvenience to the user. 2. The electrolytic capacitor used in the circuit has a large capacity, a high withstand voltage requirement, and a large volume, which increases the manufacturing cost. 3. The light-emitting diode (in series with the resistor) on the panel is connected in parallel to the rectified power supply or both ends of the button, which cannot correctly reflect the quality of the internal control circuit of the switch. the

Utility model content

The purpose of the utility model is to provide an energy-saving self-extinguishing switch with a short button time, a long lighting time, and a panel display light consistent with the internal control circuit of the switch. the

The purpose of this utility model is achieved in that it includes a full-wave bridge rectifier circuit composed of D1, D2, D3, D4, which is characterized by the upper end of the button K, the upper end of the resistors R3, R4 and the anode of the one-way thyristor SCR Connected to the output terminal of the rectifier bridge in parallel, the emitters of the triodes T1 and T2, and the cathode of the one-way thyristor SCR are connected to the output terminal of the rectifier bridge, the upper end of the resistor R1 is connected to the lower end of the button K, and the lower end of R1 is connected to the positive electrode of the capacitor C , The left end of resistor R2 is connected, the right end of R2 is connected to the base of T1, the negative electrode of capacitor C is connected to the collector of T1, the base of T2 and the lower end of R3, and the lower end of resistor R4 is connected in series with the light-emitting diode LED. The collector electrode of T2 and the trigger electrode of SCR are connected. The working principle of this energy-saving self-extinguishing switch is: after the circuit is connected, its initial state is that the triode T1 is cut off, T2 is turned on, and the voltage between the trigger electrode and the cathode of the one-way thyristor SCR is close to zero, so the SCR is not turned on, and the lamp At the moment when the button K is pressed, when L is off, a part of the current through the resistor R1 turns the triode T1 from cut-off to conduction through the resistor R2, and the other part charges the capacitor C through T1. Since the capacity of C is small, it charges quickly, and Working in the positive feedback state can accelerate the conduction of T1. At the same time, the triode T2 immediately turns from conduction to cut-off. At this time, the collector potential of T2 rises, triggering the one-way thyristor to conduct, and the lamp L is lit. . When K is disconnected, the charged capacitor C is discharged through the resistors R2, T1 and R3, keeping T1 on, T2 off, and SCR on, the delay starts, and the lamp L continues to light. The length of the capacitor C discharge time (delay time) is related to the product of the resistor (R2+R3) and the capacitor C. When the discharge current on C drops to a certain level and cannot maintain the working state, T1 turns from conduction to cutoff, T2 turns from cutoff to conduction, SCR loses the trigger current and turns off, and the light goes out. the

The beneficial effects of the utility model are: 1. The capacitor C is positive feedback connection in the circuit, which can speed up the conduction of T1, so the light L can be lighted by turning on the button K in a very short time. The capacity of C is small and the withstand voltage is low, which can meet the requirement of 1-3 minutes delay. 2. T1 and T2 act as amplification and phase inversion, the circuit is simple, and the action is reliable and stable. 3. The LED is connected in series in the collector circuit of T2, and its function is extended from the original single switch position indication to the switch status indication, that is, to reflect whether the control circuit and the bulb are intact. the

Description of drawings

Below in conjunction with accompanying drawing and example, the utility model is described in further detail:

Accompanying drawing 1 is the utility model circuit diagram

The components and their specifications and models included in the energy-saving self-extinguishing switch in the figure:

Component Model Model Component Model

D1-D4 IN4007 R1 60kΩ

T1, T2 9013 R2 200kΩ

SCR MCR100-8 R3 300KΩ

LED Φ5 red R4 560 kohms

K Ordinary bell button C uf/16v

Detailed ways:

Their connection relationship is: D1, D2, D3, and D4 form a full-wave bridge rectifier circuit, which is characterized in that the upper end of the button K, the upper end of the resistors R3, R4, and the anode of the one-way thyristor SCR are connected to the output end of the rectifier bridge. , the emitters of the triodes T1 and T2, the cathode of the one-way thyristor SCR are connected to the output terminal of the rectifier bridge, the upper end of the resistor R1 is connected to the lower end of the button K, the lower end of R1 is connected to the positive pole of the capacitor C, and the left end of the resistor R2, The right end of R2 is connected to the base of T1, the negative electrode of capacitor C is connected to the collector of T1, the base of T2 and the lower end of R3, the lower end of resistor R4 is connected in series, and the light-emitting diode LED is connected to the collector of T2, SCR The trigger poles are connected. the

Claims (1)

1. energy-conservation self-extinguishing switch; Comprise the full-wave bridge rectifier circuit that constitutes by D1, D2, D3, D4; It is characterized in that the anode of upper end and unidirectional thyristor SCR of upper end, resistance R 3, the R4 of button K is connected to the output of rectifier bridge; The emitter of triode T1, T2, the negative electrode of unidirectional thyristor SCR links to each other with the output of rectifier bridge, terminates to the lower end of button K on the resistance R 1; The left end of the lower end of R1 and the positive pole of capacitor C, resistance R 2 joins; The right-hand member of R2 and the base stage of T1 are joined, and the ground level of the negative pole of capacitor C and the collector electrode of T1, T2 and the lower end of R3 join, and join with the collector electrode of T2, the trigger electrode of SCR behind the lower end series connection LED of resistance R 4.

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