CN200994220Y

CN200994220Y - Electronic ballast suitable for wide range voltage

Info

Publication number: CN200994220Y
Application number: CN 200620170449
Authority: CN
Inventors: 李江淮
Original assignee: Individual
Current assignee: Leedarson Green Lighting Co Ltd
Priority date: 2006-12-31
Filing date: 2006-12-31
Publication date: 2007-12-19
Anticipated expiration: 2016-12-31

Abstract

An electronic ballast applied to wide voltage is connected with an automatic voltage regulator circuit in series at the output end of the bridge rectifier circuit of general electronic ballast circuit and one end of the light tube, another output end of the rectifier circuit is connected to the other end of the light tube; the automatic voltage regulator circuit is composed of a benchmark voltage circuit, a constant current source circuit, a discharge circuit, a triggered switch circuit and a thyristor D7; the benchmark voltage circuit is composed of resistors R1 and D5 and the constant current source circuit is composed of resistors R2, R3 , R4 and audion Q1; the is composed of voltage-regulator tube D5 and audion Q1; the discharge circuit is composed of resistor R5, R6, R7 and audion Q2; the triggered switch circuit is composed of capacitor C1 and D6 which trigger the diode bi-directionally. When the voltage of an electric network fluctuates, the automatic voltage regulator circuit will automatically regulate the voltage input of the light tube, so that the light tube can still work under voltage fluctuations. The utility model is applicable for the countries or regions whose voltage fluctuations of electric networks during the peak and the trough are large.

Description

Be applicable to the electric ballast of wide voltage

Technical field

The utility model relates to a kind of electric ballast, particularly a kind of electric ballast that is applicable to wide voltage with automatic regulation voltage.

Background technology

Many developing countries are owing to electric power resource scarcity, the outmoded backwardness of transmission facility at present; be unable to catch up with the needs that electricity consumption increases; cause the huge spread of peak times of power consumption and low peak period voltage to reach more than the 200V; be that voltage ripple of power network can cause that fluorescent lamp is under-voltage can't work or overvoltage damages when big; general fluorescent lamp or energy-conservation electronic lamp ballast circuit can not be worked under this condition, thereby solve that electric ballast can work when under-voltage, protect fluorescent lamp or this problem of electricity-saving lamp during overvoltage.

The utility model content

For solving the problem of above-mentioned electric ballast, the utility model be intended to propose a kind of at voltage ripple of power network greater than the electric ballast that is applicable to wide voltage that still can normally use.

The technical scheme that the invention for solving the technical problem adopted is: the electric ballast that is applicable to wide voltage, contain the universal electric ballast, it is characterized in that: be in series with the automatic voltage regulation circuit at the output of the bridge rectifier of universal electric ballast and an end of fluorescent tube, another output of rectification circuit connects the other end of fluorescent tube.

The utility model automatic voltage regulation circuit is by reference voltage circuit, constant-current source circuit, and discharge circuit, trigger switch circuit and thyristor D7 connect to form; Reference voltage circuit by resistance R 1, D5 connect to form, constant-current source circuit connects to form by resistance R 2, R3, R4 and triode Q1; Connect to form by voltage-stabiliser tube D5 and triode Q1; Discharge circuit is connected to form by resistance R 5, R6, R7 and triode Q2; The trigger switch circuit is connected to form by capacitor C 1 and D6 bidirectional trigger diode; Trigger switch circuit in the automatic voltage regulation circuit also can be connected to form by resistance R 8, R9, capacitor C 1 and Q3 unijunction transistor.

The beneficial effects of the utility model are: be in series with the automatic voltage regulation circuit at the output of the bridge rectifier of universal electric ballast and an end of fluorescent tube, another output of rectification circuit connects the other end of fluorescent tube, voltage generation fluctuation when utility grid, the automatic voltage regulation circuit of connecting with fluorescent tube is regulated automatically to the fluorescent tube input voltage, make the fluorescent tube still can operate as normal under the big situation of voltage fluctuation, big for the peak times of power consumption of some country electrical network and the voltage fluctuation gap between low peak period, the utility model all is suitable for.

Description of drawings

Fig. 1 is the utility model operation principle block diagram;

Fig. 2 is the utility model embodiment one circuit diagram;

Fig. 3 is the utility model embodiment two circuit diagrams.

Among the figure: 1. AC power; 2. automatic voltage regulation circuit; 3. fluorescent tube; 4. rectification circuit; 5. reference voltage circuit; 6. constant-current source circuit; 7. discharge circuit; 8. trigger switch circuit; 9.D7 thyristor; 10. bidirectional trigger diode; 11. unijunction transistor.

Embodiment

Below in conjunction with drawings and Examples the utility model is further specified.

Embodiment one

The electric ballast that is applicable to wide voltage as depicted in figs. 1 and 2, contain the universal electric ballast, the output of the bridge rectifier of being made up of diode D1～D4 in the universal electric ballast 4 and an end of fluorescent tube 3 are in series with automatic voltage regulation circuit 2, and another output of rectification circuit 4 connects the other end of fluorescent tube 3; Automatic voltage regulation circuit 2 is by reference voltage circuit 5, constant-current source circuit 6, and discharge circuit 7, trigger switch circuit 8 and D7 thyristor 9 connect to form; Reference voltage circuit 5 by resistance R 1, D5 be connected in series form, constant-current source circuit 6 connects to form by resistance R 2, R3, R4 and triode Q1; Connect to form by voltage-stabiliser tube D5 and triode Q1; Discharge circuit 7 is connected to form by resistance R 5, R6, R7 and triode Q2; Trigger switch circuit 8 is connected to form by capacitor C 1 and D6 bidirectional trigger diode 10.

After the utility model connected fluorescent tube 3 and power on, rectification circuit 4 rectifications that standard 220V alternating current is formed via diode D1-D4, A at D7 thyristor 9, the K two ends form a pulsating voltage, and this voltage is through resistance R 1 current limliting and the voltage-stabiliser tube D5 voltage stabilizing of reference voltage circuit 5, after the R3 of reference voltage process constant-current source circuit 6 and the pressure drop of R4, Q1 triode emitter voltage is greater than base voltage, the permanent conducting of Q1, electric current flows through the collector electrode of Q1, Q2 triode conducting in the discharge circuit 7, the capacitor C1 of trigger switch circuit 8 begins charging, when voltage reaches the conduction value of D6 bidirectional trigger diode 10, bidirectional trigger diode D6 conducting triggers D7 thyristor 9, make 9 conductings of D7 thyristor, the pilot angle α and the angle of flow β of D7 thyristor 9 equate that in each cycle of voltage electric current flows through fluorescent tube 3 at this moment, are carried in fluorescent tube 3 both end voltage and keep stable.The D7 thyristor disconnects when the zero passage of input voltage.

When AC power 1 voltage is higher than the standard electric alternating current pressure; it is power supply input overvoltage; the collector electrode input terminal voltage of the Q2 triode in the discharge circuit 7 descends; charging " slowly " to electric capacity; postpone the conducting of D6 bidirectional trigger diode 10; cause the triggered time of D7 thyristor 9 to delay; be that pilot angle α becomes big and angle of flow β diminishes; the ON time of D7 thyristor 9 shortens; then the pressure drop of automatic voltage regulator circuit increases; fluorescent tube 3 load voltages reduce, and reach the purpose of voltage-stabilizing protection fluorescent tube 3 operate as normal.

When AC power 1 voltage is lower than the standard electric alternating current pressure; be that the power supply input is under-voltage; Q2 triode in the discharge circuit 7 ends; capacitor discharge makes the quick conducting of D6 bidirectional diode, causes the triggered time of D7 thyristor 9 to shift to an earlier date, and promptly pilot angle α diminishes big with angle of flow β change; the ON time of D7 thyristor 9 prolongs; then the pressure drop of automatic voltage regulator circuit reduces, and fluorescent tube 3 load voltages raise, and reaches the purpose of voltage-stabilizing protection fluorescent tube 3 operate as normal.

Voltage power supply scope 100V～350V of the present utility model, big for the peak times of power consumption of some country electrical network and the voltage fluctuation gap between low peak period, the utility model all is suitable for.

Embodiment two

The electric ballast that is applicable to wide voltage as shown in figures 1 and 3, trigger switch circuit 8 also can be by resistance R 8 among Fig. 3, R9, capacitor C 1 and Q3 unijunction transistor 11 connect to form, other circuit connection structures of circuit are identical with embodiment one with operation principle, the pulsating voltage that alternating current produces behind over commutation is by resistance R 8, after the R9 dividing potential drop as the threshold voltage of unijunction transistor 11Q3, when AC power 1 voltage raises, the threshold voltage of Q3 also raises, then the voltage at electric capacity two ends will reach the threshold voltage delay of Q3, postpone for D7 thyristor 9 triggering and conducting, then the pilot angle of thyristor becomes big and the angle of flow diminishes, the ON time of D7 thyristor 9 shortens, the 2 whole pressure drops of automatic voltage regulation circuit increase, fluorescent tube 3 load both end voltage step-downs reach the purpose of automatic voltage regulation; Vice versa.

The triggering element of trigger switch circuit 8 of the present utility model can also be similar SIDAC high pressure diac, SBS silicon bidirection switch or a PUT procedure control monoclinic transistor etc. of function.

Claims

1. be applicable to the electric ballast of wide voltage, contain the universal electric ballast, it is characterized in that: be in series with the automatic voltage regulation circuit at the output of the bridge rectifier of universal electric ballast and an end of fluorescent tube, another output of rectification circuit connects the other end of fluorescent tube.

2. the electric ballast that is applicable to wide voltage according to claim 1 is characterized in that: described automatic voltage regulation circuit is by reference voltage circuit, constant-current source circuit, and discharge circuit, trigger switch circuit and thyristor D7 connect to form; Reference voltage circuit by resistance R 1, D5 connect to form, constant-current source circuit connects to form by resistance R 2, R3, R4 and triode Q1; Connect to form by voltage-stabiliser tube D5 and triode Q1; Discharge circuit is connected to form by resistance R 5, R6, R7 and triode Q2; The trigger switch circuit is connected to form by capacitor C 1 and D6 bidirectional trigger diode.

3. the electric ballast that is applicable to wide voltage according to claim 1 and 2 is characterized in that: the trigger switch circuit in the described automatic voltage regulation circuit is connected to form by resistance R 8, R9, capacitor C 1 and Q3 unijunction transistor.