CN101198203B

CN101198203B - Full-electric voltage electric ballast

Info

Publication number: CN101198203B
Application number: CN2006100412859A
Authority: CN
Inventors: 施金本
Original assignee: JIANGSU SHINUO LIGHTING CO Ltd
Current assignee: JIANGSU SHINUO LIGHTING CO Ltd
Priority date: 2006-12-04
Filing date: 2006-12-04
Publication date: 2011-05-18
Anticipated expiration: 2026-12-04
Also published as: CN101198203A

Abstract

The invention relates to a full-voltage electronic ballast used in a fluorescent lamp and an energy-saving lamp, wherein the circuit of the electronic ballast comprises an input circuit connected witha power network; the input circuit is connected with a rectification filter circuit through an EMI filter circuit; one direct voltage output part of the rectification filter circuit is connected with a half-bridge inversion driving control circuit to provide power source for the control circuit, while the other direct voltage output part is connected with an APFC (active power factor correction) preregulator; moreover, the direct voltage output part of the APFC preregulator is connected with the fluorescent lamp through the half-bridge inversion driving control circuit. The invention adopts the compression and broadening technology of APFC-IC to compress sampled signal and broaden operating range; therefore, the electronic ballast can work in a wide power network voltage range along with safe and convenient use.

Description

Full-electric voltage electric ballast

Technical field

The present invention relates to a kind of full-electric voltage electric ballast that is used for fluorescent lamp and electricity-saving lamp.

Background technology

As the electrical network of electric ballast power supply, standard differs all over the world, is 120V as states such as the U.S., Canada, and states such as Japan and Korea S. are 100V, and states such as Philippine, Egypt, Cuba are 110V, and China and part country are 220V.Existing electric ballast only can be suitable for single standard, makes troubles to use.The way of traditional solution generally is to adopt the mode of power supply selected shape, but it still operates inconvenience, and damages consuming device because of misoperation easily.

Summary of the invention

Technical problem to be solved by this invention is, provides a kind of and can adapt to the multiple voltage standard automatically, safe in utilization, full-electric voltage electric ballast easily.

The circuit of full-electric voltage electric ballast of the present invention comprises an input circuit that is connected with electrical network, input circuit inserts a current rectifying and wave filtering circuit through an EMI filter circuit, one road direct voltage output of current rectifying and wave filtering circuit connects semi-bridge inversion driving, control circuit, for it provides power supply, another road direct voltage output of current rectifying and wave filtering circuit inserts an APFC preregulator (APFC is an active power factor corrector), and the direct voltage output of APFC preregulator is connected with fluorescent lamp through semi-bridge inversion driving, control circuit again; In addition, also have a voltage compression control circuit to be connected with the control section of APFC preregulator respectively with an electric current compression control circuit.

The present invention has adopted the compression broadening technology of APFC-IC, has compressed sampled signal, broadening working range, thereby electric ballast can be moved in the line voltage scope of broad, safe in utilization, convenient.

Description of drawings

Fig. 1 is circuit theory diagrams of the present invention;

Fig. 2 is the circuit diagram of the embodiment of the invention;

Fig. 3 is the voltage compression control circuit diagram in the embodiment of the invention;

Fig. 4 is the electric current compression control circuit diagram in the embodiment of the invention.

Embodiment

As shown in Figure 1, input circuit in the circuit of the present invention can be connected with the AC network power supply of 85V～275V/50～100Hz, power supply enters the EMI filter circuit through input circuit, this circuit stops the high-frequency electromagnetic interference signal in the electric ballast to enter electrical network, prevent to pollute electrical network, play the electromagnetism buffer action; Power current is again through forming the direct current that contains certain pulsation behind the full-wave rectifier filter of current rectifying and wave filtering circuit; This direct voltage one road is delivered to semi-bridge inversion driving, control circuit, and for it provides power supply, the APFC preregulator is delivered on another road; The control section of APFC preregulator connects voltage compression controller and electric current compression controller respectively, makes the APFC preregulator can be in the line voltage scope operate as normal of broad, permanent power output; Make the high direct voltage (about 400V) of APFC preregulator output deliver to semi-bridge inversion driving, control circuit, with the generation high-frequency and high-voltage, driving fluorescent lamp igniting, luminous, and steady operation is in the arc discharge district.

The physical circuit of the embodiment of the invention such as Fig. 2～shown in Figure 4:

Its input circuit has three protections, and promptly FU short-circuit protection, VR spike absorb and protect (comprising lightning protection) and NTC wave resistance to come through a year protection.

The EMI filter circuit is made of differential mode element C1, C2, L1 and common mode element C3, C4, mainly suppresses the ballast high-frequency current and makes its EMC up to standard to the electrical network conducted interference.

Current rectifying and wave filtering circuit through capacitor C 5 filtering, is transformed into the direct current that contain certain ripple and flutter component with the electric main of 85V～275V, 50～100Hz by D1～D4 full-bridge rectification.

The APFC preregulator is that chip IC 1 and the peripheral circuit thereof of KA7526 or KDA4862 formed by model, comprise R1～R12, C6～C10, V1, L2, D5 etc., wherein R4 and C7, R5 and D5 constitute startup, accessory power supply, R1～R2 is the multiplier input, R10～R12 is that error amplifier is oppositely imported, R6 is the zero current detection input, and 3 pin (MULT) of IC1 connect voltage compression control circuit, and 4 pin (CS) of IC1 connect electric current compression control circuit.

Voltage compression control circuit constitutes (as Fig. 3) by R26, R27, V4 etc., and the electric current compression controller constitutes (as Fig. 4) by IC3, V5, R28, R29 etc.Its control model is to utilize 3 pin and 4 pin of delivering to IC1 after Ugs control Ron principle is compressed the wide current sampling signal of wide voltage in the metal-oxide-semiconductor linear resistance district, thereby when input voltage and electric current wide region are changed, the benchmark Vmo and the Vcs dynamic range of multiplier output in the PWM current sense comparator input among the IC1, and both relatively follow the tracks of constant, threshold value is constant, make RS latch operate as normal, this has just guaranteed APFC operate as normal in the electrical network of wide-voltage range, the permanent output of high-performance.

Semi-bridge inversion drives, the function of control circuit is high frequency voltage and the electric current that produces the driving fluorescent lamp pipe.Its process is; Through making improper glow discharge after fluorescent lamp is lighted from catching fire carry out the transition to the operate as normal negative differential resistance region of arc discharge (low-voltage, high-current) very soon behind the filament pre-heating).Its center part is that model is the chip IC 2 of KA7543, and it is a self-oscillation half-bridge driven chip, and it produces 45KHz, duty ratio is 40% symmetrical square wave driving the VMOS pipe, lights and high frequency voltage, the electric current of driving fluorescent lamp pipe thereby produce.IC2 also can be combined by external circuit and internal circuit and realize various control and defencive function, as: with the radio-frequency preheating filament of f=75KHz, soft-start time is adjusted by C20; R24, D11 and W realize the feedback brightness adjustment control; R17, R18, C18 are fluorescent tube protection feedback (no fluorescent tube, few fluorescent tube); It is abnormal condition protection (overcurrent protection) up to the circuit of 7 pin that L4 pays the limit; The under-voltage locking of IC2 chip internal and overvoltage protection.

Claims

1. full-electric voltage electric ballast, it is characterized in that: its circuit comprises an input circuit that is connected with electrical network, input circuit inserts a current rectifying and wave filtering circuit through an EMI filter circuit, one road direct voltage output of current rectifying and wave filtering circuit connects semi-bridge inversion driving, control circuit, for it provides power supply, another road direct voltage output of current rectifying and wave filtering circuit inserts an APFC preregulator, APFC is an active power factor corrector, and the direct voltage output of APFC preregulator is connected with fluorescent lamp through semi-bridge inversion driving, control circuit again; There is a voltage compression control circuit to be connected with the control section of APFC preregulator respectively with an electric current compression control circuit.