CN2426260Y

CN2426260Y - Resistance type light-adjusting ballast for fluorescence lamp

Info

Publication number: CN2426260Y
Application number: CN 00217443
Authority: CN
Inventors: 蒋任琦
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-27
Filing date: 2000-04-27
Publication date: 2001-04-04
Anticipated expiration: 2010-04-27

Abstract

The utility model relates to a resistance type light-adjusting ballast for fluorescence lamps. The resistance type light-adjusting ballast realizes step light adjustment through electronic circuits which are arranged in a ballast core and are specially designed. A relay normally closed contact in the circuit is connected with an induction coil after connected in parallel with two capacitors to form into a resistance selection ballast circuit; a time-delay automatic light-adjusting circuit controls a relay to work. The resistance of a resonant circuit is selected through a selective switch connected in series with the capacitor to realize the light adjustment of loads. The utility model can adjust light for the fluorescent lamps through an internal automatic switchover circuit. The resistance type light-adjusting ballast has wide adaptive range of voltage and good interference resistance, and achieves the double effects of prolonging the lifetime of the ballasts and fluorescent lamp tubes.

Description

Impedance type adjusting brightness of fluorescent lamp ballast

The utility model is a kind of impedance type adjusting brightness of fluorescent lamp ballast, belongs to electronic technology field.

In the prior art, ballast generally divides inductance type and electronic type two big classes.The inductance type structure mainly is made up of inductance coil, starter and fluorescent tube, owing to be subjected to inductance coil and starter acting in conjunction, starting resistor height, cause operating voltage range narrow, general working voltage 200V～242V, the lower limit operating voltage range is little, and the low-voltage area is used and is affected, and because the inductance coil operating current is big, cause the inductance coil temperature rise, poor stability, power consumption is big, energy waste, electricity charge expenditure increases.The electronic ballast that upgrades in the market, complex structure cost height because components and parts are many, causes parameter discrete big, poor reliability, the life-span is short, therefore can't promote the use of at present.Above-mentioned two class ballasts do not possess dimming function.

The purpose of this utility model is to provide a kind of impedance type adjusting brightness of fluorescent lamp ballast, can require fluorescent lamp is carried out light modulation according to different illumination, and it is wide to be suitable for voltage range, increases the service life, and reaches the effect of energy-saving safe.

For realizing such purpose, the ballast of the utility model design is provided with the light modulation selector switch, by being loaded on the ballast in-core through specially designed electronic circuit, realizes that versatility starts, activates, and after the incision, has a grade light modulation to brightness automatically.In circuit, be connected an inductance coil by the relay normally-closed contact with two electric capacity and after connecing, form impedance and select ballasting circuit, and design is from the work of motion tracking time-delay light adjusting circuit control relay, make impedance select the resonant capacitance in the ballasting circuit to seal in circuit, by sealing in the selector switch of electric capacity, come the selective resonance circuit impedance to realize the load light modulation.Also have the mutual inductance sample circuit in the circuit,, after rectification, filtering, provide the DC power supply of circuit the secondary sampling voltage of inductance transformer.

For understanding the technical solution of the utility model better, be further described below in conjunction with accompanying drawing.

Fig. 1 is a circuit diagram of the present utility model.

Among the figure, relay normally-closed contact J1 and capacitor C 1, C2 and discharge resistance R1 and connect after, be connected to inductance coil B, together form impedance with the selector switch K1 that seals in capacitor C 1 and select ballasting circuit, form the mutual inductance sample circuit with inductance transformer B1 and capacitor C 3 that inductance coil B is connected, the output of mutual inductance sample circuit connects the rectifier bridge of being made up of D1～D4, rectifier bridge is with resistance R 3, R4, R6, capacitor C 4, C5, C8 forms current limliting RC power supply, delay time circuit with an automatic light meter by resistance R 7, capacitor C 9, C10, relay J, diode D6 and 555 delay integrated circuit IC form, the sampling that connects starter S and load LZ zero line is followed the tracks of resistance R 2 through diode D5, resistance R 5 connects the base stage of triode BG1, with capacitor C 6, C7 forms startup tracking sampling circuit jointly.

Input 220V50HZ AC power, the normally-closed contact J1 by relay just flows through the filament pre-heating electric current to inductance coil B and inductance transformer B1, is limited in required numerical value.When starter S contact disconnects moment, produce very high pulse voltage at the load two ends, make the supporting gas ionic discharge, because inductance coil B and inductance transformer B1 series connection effect make to load on operate as normal under the stable operating current.Because instrument transformer B1 is elementary to have a stable alternating current to flow through, make the secondary stable induced voltage generation that has, through D1～D4 rectifier bridge, form the filtering of π type by resistance R 3, capacitor C 4, resistance R 4, capacitor C 5 again, produce a DC power supply, cushioned to time-delay circuit with an automatic light meter, startup tracking sampling circuit supply by resistance R 6 current limlitings and capacitor C 8, make entire circuit preparation power supply, wherein capacitor C 3 plays anti-interference effect.

When starter S contact disconnects, the load operate as normal, resistance R 2 two ends do not have pressure drop, flow through diode D5, resistance R 5 to triode BG1 base stage does not have Control current, make BG1 be in cut-off state, the C8 two ends have voltage to power to 555 delay integrated circuit IC, make R7 to capacitor C 9 charging time-delays, make integrated circuit (IC) be in the high level state of a control, the output of IC no current, relay J is not worked, along with capacitor C 9 chargings increase, make integrated circuit (IC) be in low level control, IC has electric current output, makes relay J work, normally-closed contact disconnects, make resonant capacitance C1, C2 seals in inductance coil B and inductance transformer B1, forms dual ballast resonance variableimpedance formula circuit, changes load current and reaches the light modulation purpose.Selector switch K1 can the selective resonance circuit impedance, just selects the load light modulation, and wherein resistance R 1 is capacitor C 1, C2 discharge resistance, and capacitor C 10 is integrated circuit (IC) anti-interference capacitors, and diode D6 plays the effect of protection integrated circuit (IC).

In the circuit of the present utility model, but capacitor C 1 value 0.5 μ, C2 value 2.2 μ, resistance R 2 values 50 Ω are followed the tracks of in sampling, and inductance coil B gets 0.7H, and the turn ratio of inductance transformer B1 is 1: 1.5, and delay integrated circuit IC adopts LM555.

The utility model can according to different illumination requirements, come fluorescent lamp by inner automatic switch-over circuit Carry out light modulation, compare with inductance, the voltage adaptation wide ranges reaches 180V～242V, is not subjected to electric network influencing, Anti-interference is good; Not only the ballast heating is low, safe and reliable, and good through the fluorescent tube illuminance of light modulation, Low in energy consumption, reached prolongation ballast and the double effects in fluorescent tube life-span, can reduce maintenance cost, joint About energy is applicable to the illumination use of vast low-voltage area.

Claims

1, a kind of impedance type adjusting brightness of fluorescent lamp ballast, it is characterized in that circuit relay electrical equipment normally-closed contact J1 and capacitor C 1, C2 and discharge resistance R1 and connect after, be connected to inductance coil B, together form impedance with the selector switch K1 that seals in capacitor C 1 and select ballasting circuit, form the mutual inductance sample circuit with inductance transformer B1 and capacitor C 3 that inductance coil B is connected, the output of mutual inductance sample circuit connects the rectifier bridge of being made up of D1～D4, rectifier bridge is with resistance R 3, R4, R6, capacitor C 4, C5, C8 forms current limliting RC power supply, delay time circuit with an automatic light meter by resistance R 7, capacitor C 9, C10, relay J, diode D6 and integrated circuit (IC) are formed, the sampling that connects starter S and load LZ zero line is followed the tracks of resistance R 2 through diode D5, resistance R 5 connects the base stage of triode BG1, with capacitor C 6, C7 forms startup tracking sampling circuit jointly.