CN2186978Y

CN2186978Y - Bulb voltage limiting protector

Info

Publication number: CN2186978Y
Application number: CN 93246438
Authority: CN
Inventors: 卞强华; 黄剑
Original assignee: Jiangsu Material Trade Center
Current assignee: Jiangsu Material Trade Center
Priority date: 1993-12-21
Filing date: 1993-12-21
Publication date: 1995-01-04
Anticipated expiration: 2003-12-21

Abstract

The utility model discloses a bulb voltage limiting protector, which comprises a synchronous trigger pulse generating circuit and an AC voltage reducing circuit which are connected in series with the power supply line of a bulb, wherein, the synchronous trigger pulse generating circuit is composed of a transformer B, a diode (D1-D4) bridge, resistance (R1, R2, R3, R4), capacitance (C1), a double-base diode (BG1), and a switch triode (BG2); the AC voltage reducing circuit is composed of a thyristor (D9), a diode (D5-D8) bridge, capacitance (C2), and electrical inductance (L1). The utility model has the advantages that the circuit is simple; the cost is low; the output waveform is good; the service life of the incandescent lamps can be prolonged when the illumination intensity is guaranteed.

Description

Bulb voltage limiting protector

The utility model relates to a kind of lighting bulb protector of lengthening the life, particularly a kind of incandescent lamp bulb voltage-limiting protector.

At present, various illuminations, the decorative lamp of hotel industry adopt incandescent lamp bulb more.Because the line voltage shakiness, night is higher, and often up to 250 volts, overtension causes bulb life short, and not only the bulb loss is big, and needs to change again and again the bulb of damage, hall pendent lamp especially, and the position height is changed very inconveniently, and labour intensity is big.Existing bulb dropping equipment, as AC voltage regulator, pressurizer etc., the former volume is big, and power consumption is big, cost height, latter circuit's complexity, cost height.

The purpose of this utility model is, provides that a kind of circuit is simple, cost is low, good output waveform, safe and reliable bulb voltage-limiting protector, prolongs the useful life of incandescent lamp bulb under the prerequisite that guarantees illumination.

Technical solution of the present utility model is; the bulb voltage-limiting protector comprises synchronous triggering pulse generation circuit and ac buck circuit two parts; be connected in the bulb powered circuit; the former is by transformer B; diode D1-D4 bridge heap; resistance R 1; R4; R5; R6; capacitor C 1; double base diode BG1; switch triode BG2 forms; the latter is by thyristor D9; diode D5-D8 bridge heap; capacitor C 2; inductance L 1 is formed; transformer B elementary meets 220 volts of power supply phase line L; center line N; the secondary ac input end that connects diode D1-D4 bridge heap; output cathode connecting resistance R1 and the end of R4 and the C utmost point of switch triode BG2 of diode D1-D4 bridge heap; the output negative pole contact is beamed back the road with reference to ground end E; one end of resistance R 1 another termination capacitor C 1 and the e utmost point of double base diode BG1; the B2 utmost point of resistance R 4 another termination double base diode BG1; the end of the B1 utmost point connecting resistance R5 of double base diode BG1 and the b utmost point of switch triode BG2; the end of the e utmost point connecting resistance R6 of switch triode BG2; capacitor C 1; resistance R 5; the other end contact of R6 is beamed back the road with reference to ground end E; power supply phase line L and load line RL connect the end that exchanges of diode D5-D8 bridge heap; the output cathode of diode D5-D8 bridge heap connects a utmost point of thyristor D9; output negative pole connects the K utmost point of thyristor D9 and triggers the loop with reference to ground end E, and capacitor C 2 and inductance L 1 are connected between power supply phase line L and the load line RL.The effect of synchronous triggering pulse generation circuit be produce with isolated from power and with 100 positive pulses of per second of alternating voltage strict synchronism, this pulse can trigger high-power thyristor reliably.The effect in ac buck loop is the positive and negative half-wave alternating current path that step-down is provided for load.

With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in detail.

Fig. 1 is the utility model bulb voltage-limiting protector electricity principle schematic.

As shown in Figure 1; the utility model bulb voltage-limiting protector has by transformer B, diode D1-D4 rectifier bridge; the synchronous triggering pulse generation circuit that resistance R 1, R4, R5, R6, capacitor C 1, double base diode BG1, switch triode BG2 form and ac buck circuit two parts circuit of forming by thyristor D9, diode D5-D8 bridge heap, capacitor C 2, inductance L 1; it is connected in the bulb powered circuit; N termination center line; L termination phase line, the load of RL termination.

The utility model circuit working principle is as follows: transformer B converts the 220V alternating voltage to the 6V alternating voltage, after bridge heap D1-D4 rectification, become pulsating direct current, be 100 half-wave DC pulsating voltages of per second output, pass through R1, R4, R5, C1, the impulse circuit that BG1 forms, at 100 lock-out pulses of the B1 of BG1 end per second output, penetrate the control utmost point that removes to trigger thyristor D9 with circuit via BG2 again, when if phase voltage is positive half wave, electric current passes through D7, D9, D6, L1 flows to load, form positive half wave loop (seeing dotted line direction among Fig. 1), if phase voltage is when bearing half-wave, electric current is through load, L1, D5, D9, D8 forms negative half-wave loop (seeing solid line direction among Fig. 1).L1, C2 are filter network, by changing the angle of flow of thyristor D9, can control output voltage, and through filtering, obtain level and smooth output waveform.

In order to make the utility model can adapt to the required control reference voltage of different occasions; simultaneously for heater element D5-D8, D9 in the protective circuit; further feature is: band switch K1 that (1), setting and resistance R 1 are in parallel and resistance R 2, R3; selective output loop voltage range is used; (2), the temperature switch K2 of the g utmost point of the e utmost point that connects switch triode BG2 and thyristor D9 is set; when component temperature rises to set point, cut off load by K2 immediately, play the safeguard protection effect.

Double base diode BG model is BT35 among the utility model embodiment; switch triode BG model is 3DK4C; thyristor D9 model is SMG100V41A, and heat portective switch K2 work design temperature is 100 ℃, and output voltage can divide two grades; be adjusted between the 170V to 200V; use proof through reality, bulb illumination does not have obvious influence, and filament is not trembled and do not dodged; and improve bulb service life greatly, the common bulb life-span can be more than 4000 hours.

The utility model circuit is simple, input and output voltage phase invariant, and output waveform is better, and voltage can be with resistive, inductive load not with the load size variation, and in-fighting is little, and result of use is good, and cost is low.

Claims

1; the bulb voltage-limiting protector; it is characterized in that having synchronous triggering pulse generation circuit and ac buck circuit two parts; be connected in the bulb powered circuit; the former is by transformer (B); diode (D1-D4) bridge heap; resistance (R1; R4; R5; R6); electric capacity (C1); double base diode (BG1); switch triode (BG2) is formed; the latter is by thyristor (D9); diode (D5-D8) bridge heap; electric capacity (C2); inductance (L1) is formed; the elementary 220 volts of power supply phase lines (L) that connect of transformer (B); center line (N); the secondary ac input end that connects diode (D1-D4) bridge heap; output cathode connecting resistance (R1) and an end of resistance (R4) and the C utmost point of switch triode (BG2) of diode (D1-D4) bridge heap; the output negative pole contact is beamed back the road with reference to ground end (E); the e utmost point of one end of another termination capacitor of resistance (R1) (C1) and double base diode (BG1); the B2 utmost point of another termination double base diode (BG1) of resistance (R4); one end of the B1 utmost point connecting resistance (R5) of double base diode (BG1) and the b utmost point of switch triode (BG2); one end of the e utmost point connecting resistance (R6) of switch triode (BG2); electric capacity (C1); resistance (R5; R6) other end contact is beamed back the road with reference to ground end (E); power supply phase line (L) and load line (RL) connect the end that exchanges of diode (D5-D8) bridge heap; the output cathode of diode (D5-D8) bridge heap connects a utmost point of thyristor (D9); output negative pole connects the K utmost point of thyristor (D9) and triggers the loop with reference to ground end (E), and electric capacity (C2) and inductance (L1) are connected between power supply phase line (L) and the load line (RL).

2, bulb voltage-limiting protector according to claim 1 is characterized in that being provided with band switch (K1) and the resistance (R2, R3) in parallel with resistance (R1).

3, bulb voltage-limiting protector according to claim 1 and 2 is characterized in that being provided with the temperature switch (K2) of the g utmost point of the e utmost point that connects switch triode (BG2) and thyristor (D9).