CN2512194Y

CN2512194Y - Pre-heated electronic ballast

Info

Publication number: CN2512194Y
Application number: CN 01258469
Authority: CN
Inventors: 何飚
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-11-29
Filing date: 2001-11-29
Publication date: 2002-09-18
Anticipated expiration: 2011-11-29

Abstract

The utility model relates to a pre-heated electronic ballast comprising an electronic switching circuit, which is characterized in that: the utility model also comprises a full wave AC rectification circuit, an input terminal of the rectification circuit is connected with an output terminal of a lamp tube, and an output terminal of the rectification circuit is connected with an input terminal of the electronic switching circuit; the utility model also comprises a constant voltage circuit which receives the output signal of the electronic switching circuit and keeps constant voltage; and the utility model further comprises an electronic switch control circuit which can turn off the electronic switching circuit after receiving the constant voltage signal outputted by the constant voltage circuit. The utility model has long service life. As the utility model has a pre-heat function, the service life of the lamp tube is prolonged and the lamp tube can be activated at low voltage.

Description

The electronic starter of band preheat function

(1) technical field

The utility model relates to a kind of electronic starter for fluorescent lamp, relates in particular to a kind of electronic starter with preheat function.

(2) background technology

A few days ago, the starter that is used for fluorescent lamp has three kinds; A kind of is conventional neon bulb type starter, this starter also has preheat function, but because the bimetal leaf of its use continuous break-make in long-term starter, the electric current that flows through is big again, after service time is long, the contact two ends of bimetal leaf are very easily aging, so useful life is short, and also produce stroboscopic phenomenon in the starter process.Another kind is the electronic starter of tape relay, this starter does not have preheat function, the fluorescent lamp that uses this starter is once energising horse back starter, because fluorescent lamp is aging easily for a long time at the cold conditions starter, after using a period of time, fluorescent tube does not work at last because of premature aging deepening gradually, and the operating period is also short than the lamp tube service life of using conventional starter, but its starter itself is but long than the conventional starter operating period, does not also have stroboscopic phenomenon.Also having a kind of is to adopt controllable silicon to make the starter element, it is to adopt halfwave rectifier, the reverse voltage that is produced by ballast also can reduce half, the difficulty of daylight lamp glow starting strengthens accordingly, because the silicon controlled shutoff is when the alternating current zero passage, the reverse voltage that ballast is produced reduces greatly in addition.

(3) summary of the invention

The purpose of this utility model provides a kind of long service life, the electronic starter of the band preheat function that the required voltage of starter is low.

In order to achieve the above object, the utility model is achieved in that and comprises electronic switching circuit; It is characterized in that: it also comprises an all-wave ac rectifier, the output of its input termination fluorescent tube, the input of its output termination electronic switching circuit; Comprise that also one receives the output signal of electronic switching circuit and the constant voltage circuit of constant voltage; Comprise that also one receives the electronic switch control circuit of breaking circuit switching circuit behind the constant voltage signal of constant voltage circuit output.

Of the present utility modelly further be improved to, the all-wave ac rectifier comprises diode D1 one D4, and they constitute full-wave bridge rectifier circuit.Electronic switching circuit comprises controllable silicon T1, resistance R 1, R2, capacitor C 1, C2; Be connected on A, the B output of full-wave rectifying circuit after resistance R 1, the R2 series connection, the anode of controllable silicon T1 connects an output terminals A of all-wave AC adapter, one terminating resistor R1 of capacitor C 1, the series connection point of R2, the control utmost point of another termination controllable silicon T1, capacitor C 2 is in parallel with resistance R 2.Constant voltage circuit comprises diode D5, D6, the negative electrode of the positive termination controllable silicon T1 after diode D5, the D6 series connection, and its negative terminal meets the output B of all-wave ac rectifier.Electronic switch control circuit comprises controllable silicon T2, resistance R 3, R4, R5 and capacitor C 3; The anode of controllable silicon T2 connects the trigger electrode of controllable silicon T1, the negative electrode of controllable silicon T2 connects the B end of all-wave ac rectifier, the negative electrode of a termination controllable silicon T1 after resistance R 4 is connected with capacitor C 3, the B end of another termination all-wave ac rectifier, the control utmost point of resistance R 3 one termination controllable silicon T2, the series connection point of other end connecting resistance R4, C3, resistance R 5 is in parallel with the series circuit of diode D5, D6.

The utility model compared with prior art has following advantage:

1, long service life, since its band preheat function, the long service life of fluorescent tube;

2, starter under low pressure;

3, do not produce electric spark, stroboscopic phenomenon can not occur.

(4) description of drawings

Fig. 1 is a block diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

(5) embodiment

Below in conjunction with drawings and Examples the utility model is done further detailed description:

As shown in Figure 1, a kind of electronic starter with preheat function comprises electronic switching circuit 2; It also comprises an all-wave ac rectifier 1, the output of its input termination fluorescent tube, the input of its output termination electronic switching circuit; Comprise that also one receives the output signal of electronic switching circuit 2 and the constant voltage circuit 3 of constant voltage; Comprise that also one receives the electronic switch control circuit 4 that turn-offs electronic switching circuit 2 behind the constant voltage signal of constant voltage circuit 3 outputs.

As shown in Figure 2, above-mentioned all-wave ac rectifier 1 comprises diode D1 one D4, and they constitute full-wave bridge rectifier circuit.Above-mentioned electronic switching circuit 2 comprises controllable silicon T1, resistance R 1, R2, capacitor C 1, C2; Be connected on A, the B output of full-wave bridge rectifier circuit after resistance R 1, the R2 series connection, the anode of controllable silicon T1 connects an output terminals A of full wave bridge rectifier, one terminating resistor R1 of capacitor C 1, the series connection point of R2, the control utmost point of another termination controllable silicon T1, capacitor C 2 is in parallel with resistance R 2.Above-mentioned constant voltage circuit 3 comprises diode D5, D6, the negative electrode of the positive termination controllable silicon T1 after diode D5, the D6 series connection, and its negative terminal meets the output B of full-wave bridge rectifier circuit.Above-mentioned electronic switch control circuit 4 comprises controllable silicon T2, resistance R 3, R4, R5 and capacitor C 3; The anode of controllable silicon T2 connects the trigger electrode of controllable silicon T1, the negative electrode of controllable silicon T2 connects the B end of full-wave bridge rectifier circuit, the negative electrode of a termination controllable silicon T1 after resistance R 4 and the capacitances in series, the B end of another termination full-wave bridge rectifier circuit, the control utmost point of resistance R 3 one termination controllable silicon T2, the series connection point of other end connecting resistance R4, C3, resistance R 5 is in parallel with the series circuit of diode D5, D6.During work, work as energized, alternating current is through ballast and filament of fluorescent lamp, after the bridge rectifier rectification that D1-D4 forms, through resistance R 1, the R2 dividing potential drop, to capacitor C 1 charging, controllable silicon T1 conducting, at this moment to filament pre-heating, diode D5, D6 produces 1.4 volts of voltages, this moment is to capacitor C 3 chargings, when being charged to when making controllable silicon T2 conducting, the voltage of the controllable silicon T1 control utmost point is zero, and controllable silicon T1 turn-offs, this moment, ballast produced a reverse voltage that is enough to make tube starting ground very high, behind the starter, because the shunting of filament makes controllable silicon T1 can not get trigger current, be in off state, thereby fluorescent lamp continues to light.

Claims

1, a kind of electronic starter with preheat function comprises electronic switching circuit; It is characterized in that: it also comprises an all-wave ac rectifier (1), the output of its input termination fluorescent tube, the input of its output termination electronic switching circuit (2); Comprise that also one receives the output signal of electronic switching circuit (2) and the constant voltage circuit (3) of constant voltage; Comprise that also one receives the electronic switch control circuit (4) that turn-offs electronic switching circuit (2) behind the constant voltage signal of constant voltage circuit (3) output.

2, the electronic starter of band preheat function according to claim 1 is characterized in that: all-wave ac rectifier (1) comprises diode D1 one D4, and they constitute full-wave bridge rectifier circuit.

3, the electronic starter of band preheat function according to claim 1 is characterized in that: electronic switching circuit (2) comprises controllable silicon T1, resistance R 1, R2, capacitor C 1, C2; Be connected on A, the B output of all-wave ac rectifier (1) after resistance R 1, the R2 series connection, the anode of controllable silicon T1 connects an output terminals A of all-wave ac rectifier (1), one terminating resistor R1 of capacitor C 1, the series connection point of R2, the control utmost point of another termination controllable silicon T1, capacitor C 2 is in parallel with resistance R 2.

4, the electronic starter of band preheat function according to claim 1, it is characterized in that: constant voltage circuit (3) comprises diode D5, D6, the negative electrode of positive termination controllable silicon T1 after diode D5, the D6 series connection, its negative terminal meets the output B of all-wave ac rectifier.

5, the electronic starter of band preheat function according to claim 1 is characterized in that: electronic switch control circuit (4) comprises controllable silicon T2, resistance R 3, R4, R5 and capacitor C 3; The anode of controllable silicon T2 connects the trigger electrode of controllable silicon T1, the negative electrode of controllable silicon T2 connects the B end of all-wave ac rectifier (1), the negative electrode of a termination controllable silicon T1 after resistance R 4 is connected with capacitor C 3, the B end of another termination all-wave ac rectifier (1), the control utmost point of resistance R 3 one termination controllable silicon T2, the series connection point of other end connecting resistance R4, C3, resistance R 5 is in parallel with the series circuit of diode D5, D6.