CN202857112U

CN202857112U - Low-pressure sodium lamp electronic ballast circuit

Info

Publication number: CN202857112U
Application number: CN2012205744476U
Authority: CN
Inventors: 修建东
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-11-05
Filing date: 2012-11-05
Publication date: 2013-04-03
Anticipated expiration: 2022-11-05

Abstract

The utility model discloses a low-pressure sodium lamp electronic ballast circuit, and provides a low-pressure sodium lamp electronic ballast circuit which has the advantage of stable operation, has an independent and stable integrated chip auxiliary power supply, and has the overcurrent and overvoltage protection functions and the lamp abnormal condition protection function. The low-pressure sodium lamp electronic ballast circuit is composed of a filter and rectifier circuit, a power factor correction circuit, a driving control and protection circuit, an integrated chip auxiliary power supply circuit, a high-frequency half-bridge inverter circuit and a low-pressure sodium lamp starting circuit, wherein the filter and rectifier circuit is connected with an external alternating-current power supply, and the low-pressure sodium lamp starting circuit is connected with a low-pressure sodium lamp tube.

Description

A kind of electronic ballast for low pressure sodium lamp circuit

Technical field

The utility model relates to lighting ballast technical field, espespecially a kind of electronic ballast for low pressure sodium lamp circuit.

Background technology

Low-pressure sodium lamp is the electric light source that utilizes the low pressure sodium vapor discharge luminous, is coated with infrared reflection film in its glass shell, is the less and the highest artificial light sources of light efficiency now of light decay, and its light efficiency is up to 200lm/W.What low-pressure sodium lamp sent is monochromatic gold-tinted, be used for the photochromic place that does not require, but its " mist transmitting " shows very remarkably, is particularly suitable for highway, traffic route, town road, park, garden illumination, can make the people clearly see the object that aberration is smaller.Low-pressure sodium lamp also is a kind of efficient lamp kind that substitutes the high-pressure mercury lamp electrical energy saving, and application places is also in continuous expansion.

What traditional low-pressure sodium lamp ballast used is self coupling leakage field frequency inductance formula ballast, because of own vol large, weight is high, own loss is large, under the condition of power frequency power supply, obvious stroboscopic effect is arranged, affected the raising of low-pressure sodium lamp light efficiency, power output changes greatly with the fluctuation of supply power voltage, and energy consumption is high, and has had a strong impact on the useful life of low-pressure sodium lamp pipe.Green Lighting Project popularization at home, electric ballast will progressively replace frequency inductance formula ballast, enter the practical commercialization stage, electric ballast is at control performance, operation characteristic, economic benefit and Costco Wholesale all are better than inductance ballast, the distinctive structure of low-pressure sodium lamp and performance, circuit of electronic ballast is had higher requirement, existing electronic ballast for low pressure sodium lamp circuit, adopt power MOSFET tube half-bridge driven mode, depend on to a great extent the job stability of integrated chip its useful life, but the simple and easy Power supply mode of the employing that its working power is traditional does not often reach performance requirement.

Summary of the invention

A kind of electronic ballast for low pressure sodium lamp circuit of the utility model; it is characterized in that for above-mentioned deficiency; a kind of working stability is provided, has independently, stable integrated chip accessory power supply, the electronic ballast for low pressure sodium lamp circuit of over-current over-voltage protection and lamp abnormity protection function.

To achieve these goals; technical solution of the present utility model is: a kind of electronic ballast for low pressure sodium lamp circuit is comprised of filtering and rectification circuit, circuit of power factor correction, driving control and protection circuit, integrated chip auxiliary power circuit, high frequency half bridge inverter circuit and low-pressure sodium lamp start-up circuit; filtering is connected with external ac power source with rectification circuit, and the low-pressure sodium lamp start-up circuit is connected with the low-pressure sodium lamp pipe.

Described filtering and rectification circuit are made of piezo-resistance RV, inductance L 1, capacitor C 1～C3 and C7 and rectifier bridge BRG1.

Described circuit of power factor correction is made of integrated chip IC1, Industrial Frequency Transformer T1, resistance R 1～R9, capacitor C 4～C6 and C8～C11, power MOSFET tube Q1 and diode D1 and D2, and has voltage stabilizing function.

Described driving control and protection circuit is made of integrated IC2, diode D7, resistance R 10～R13, electrochemical capacitor C13, R16 and R17, capacitor C 14～C18 and Industrial Frequency Transformer T2.

Described integrated chip auxiliary power circuit is to be made of rectifier bridge BRG2 and BRG3, capacitor C 12 and voltage-stabiliser tube LM.

Described high frequency half bridge inverter circuit is made of Industrial Frequency Transformer T2, resistance R 14, R15 and R18, power MOSFET tube Q2 and Q3 and diode D5 and D6.

Described low-pressure sodium lamp start-up circuit is to be made of inductance L 2, capacitor C 19 and C20.

The beneficial effects of the utility model are: electric main is converted into direct current after filtering and rectification; direct current is through circuit of power factor correction; start driving control and protection circuit by the integrated chip auxiliary power circuit; make high frequency half bridge inverter circuit and the work of low-pressure sodium lamp start-up circuit; low-pressure sodium lamp is done work; protective circuit is obtained output voltage signal from the high frequency half bridge inverter circuit; be sent to Drive and Control Circuit after the processing; Drive and Control Circuit is controlled power stage according to the voltage signal of lamp abnormity protection circuit output; reliable and stable work accessory power supply to the integrated chip in circuit of power factor correction and the driving control and protection circuit provides can ensure the stable operation of electronic ballast for low pressure sodium lamp.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Accompanying drawing 1 is circuit block diagram of the present utility model.

Accompanying drawing 2 is circuit theory diagrams of the present utility model.

Among the figure: 01, filtering and rectification circuit, 02, circuit of power factor correction, 03, the high frequency half bridge inverter circuit, 04, the low-pressure sodium lamp start-up circuit, 05, drive the control and protection circuit, 06, the integrated chip auxiliary power circuit.

Embodiment

As shown in drawings: a kind of electronic ballast for low pressure sodium lamp circuit is comprised of filtering and rectification circuit 01, circuit of power factor correction 02, high frequency half bridge inverter circuit 03, low-pressure sodium lamp start-up circuit 04, driving control and protection circuit 05, integrated chip auxiliary power circuit 06, filtering is connected with rectification circuit and is connected with external ac power source, low-pressure sodium lamp start-up circuit 04 is connected with the low-pressure sodium lamp pipe, and filtering and rectification circuit 01 are made of piezo-resistance RV, inductance L 1, capacitor C 1～C3 and C7 and rectifier bridge BRG1; Circuit of power factor correction 02 is made of integrated chip IC1, Industrial Frequency Transformer T1, resistance R 1～R9, capacitor C 4～C6 and C8～C11, power MOSFET tube Q1 and diode D1 and D2, and has voltage stabilizing function; Driving control and protection circuit 05 is made of integrated IC2, diode D7, resistance R 10～R13, electrochemical capacitor C13, R16 and R17, capacitor C 14～C18 and Industrial Frequency Transformer T2; Integrated chip auxiliary power circuit 06 is to be made of rectifier bridge BRG2 and BRG3, capacitor C 12 and voltage-stabiliser tube LM; High frequency half bridge inverter circuit 03 is made of Industrial Frequency Transformer T2, resistance R 14, R15 and R18, power MOSFET tube Q2 and Q3 and diode D5 and D6; Low-pressure sodium lamp start-up circuit 04 is to be made of inductance L 2, capacitor C 19 and C20.

The interchange input two ends of rectifier bridge BRG2 link to each other with the secondary coil two ends of Industrial Frequency Transformer T1 respectively; the pin OUT1 of integrated chip IC2 links to each other with the primary coil of Industrial Frequency Transformer T2; the pin OUT2 of integrated chip IC2 links to each other by the other end of electric capacity with the primary coil of Industrial Frequency Transformer T2; the two ends of primary coil link to each other with the input two ends that exchange of rectifier bridge BRG3 respectively; the positive terminal of rectifier bridge BRG2 and BRG3 all is connected to the Vin end of voltage-stabiliser tube LM; the pin Gnd termination power ground of its negative pole end and voltage-stabiliser tube LM; the pin Vout end of voltage-stabiliser tube LM links to each other with the pin 3 of integrated chip IC1 and the pin Vcc end of integrated IC2 with D4 by diode D3 respectively; capacitor C 5 is with in parallel with capacitor C 6 again after resistance R 4 is connected; its two ends are connected to respectively pin one and the pin two of integrated chip IC1; the pin one of integrated chip IC1 links to each other with the contact of resistance R 8 and R9; another termination power ground of resistance R 9; the pin 4 of integrated chip IC1 links to each other with resistance R 6 with capacitor C 11 respectively; the pin 5 of integrated chip IC1 links to each other with the sampling coil of Industrial Frequency Transformer T1 by resistance R 3; another termination power ground of sampling coil; the pin 6 of integrated chip IC1 connects power supply ground; the pin 7 of integrated chip IC1 is connected with the grid of power MOSFET tube Q1 by resistance R 5 as output; the pin 8 of integrated chip IC1 connects power supply ground by electrochemical capacitor C9 and capacitor C 10; and be connected with pin 3 by resistance R 1; the pin Vcc end of integrated chip IC2 links to each other with the positive pole of electrochemical capacitor C13 with R10 respectively; its Rpre end; the RT end; Cpre end and CT end are respectively by resistance R 12 and R13; capacitor C 15 and C14 connect power supply ground; the drain electrode of power MOSFET tube Q3 is connected to the over-current detection input Pro end of integrated chip IC2 by diode D7 and resistance R 16; and connect power supply ground by resistance R 18; over-current detection input Pro end connects power supply ground by resistance R 17 and the capacitor C 18 of parallel connection again; the abnormal protection input LD end of integrated chip IC2 connects power supply ground by capacitor C 16; all the other pins of integrated chip IC2 connect power supply ground; secondary two coils of Industrial Frequency Transformer T2 link to each other with the grid of power MOSFET tube Q2 and Q3 with R15 by resistance R 14 respectively; the other end of secondary two coils links to each other with the drain electrode of power MOSFET tube Q2 and Q3 respectively; the drain electrode of power MOSFET tube Q2 be connected to inductance L 2 one ends after the source electrode of Q3 links to each other; the other end of inductance L 2 links to each other with capacitor C 19 respectively; another termination fluorescent tube LAMP of capacitor C 19; another termination power ground of fluorescent tube LAMP, capacitor C 20 is attempted by the two ends of low-pressure sodium lamp pipe LAMP.

Electric main is converted into direct current after filtering and rectification, direct current is through circuit of power factor correction 02, charge to capacitor C 13 by resistance R 10, when reaching starting resistor, integrated chip IC2 normal operation, produce the PWM ripple and come driving power MOSFET pipe Q2 and Q3, make it in turn conducting and cut-off, its duty ratio is about 50% square-wave signal, provide the starter signal through inductance L 2 and capacitor C 19 and C20 to fluorescent tube LAMP, inductance L 2 and capacitor C 19 and C20 form the LC controlled resonant converter, before low-pressure sodium lamp starts, because the inert gas of filling in the low-pressure sodium lamp electric arc tube does not gasify, so low-pressure sodium lamp is in quite high impedance state, can think that low-pressure sodium lamp is in open-circuit condition; In half-bridge LC controlled resonant converter, series resonance capacitor C 19 and parallel resonance capacitor C 20 are cascaded and resonance inductance L 2 resonance under AC power drives jointly, thereby produce high voltage at the C20 two ends; In the half-bridge LC of steady operation controlled resonant converter, series resonance capacitor C 19 and resonance inductance L 2 for the lamp load power supply, provide the required modulating voltage of steady operation and lamp current under AC power drives, and pass through very little by-pass current in parallel resonance capacitor C 20.Protective circuit is obtained output voltage signal from high frequency half bridge inverter circuit 03; be sent to Drive and Control Circuit after the processing; Drive and Control Circuit is controlled power stage according to the voltage signal of lamp abnormity protection circuit output; reliable and stable integrated chip auxiliary power circuit to integrated chip IC1 and IC2 provide can ensure the stable operation of electronic ballast for low pressure sodium lamp.

The above; execution mode only is that preferred implementation of the present utility model is described; be not that scope of the present utility model is limited; under the prerequisite of the spirit that does not break away from the utility model technology; various distortion and improvement that this area engineers and technicians make the technical solution of the utility model all should fall in the definite protection range of claims of the present utility model.

Claims

1. electronic ballast for low pressure sodium lamp circuit; it is characterized in that: described electronic ballast for low pressure sodium lamp circuit is comprised of filtering and rectification circuit, circuit of power factor correction, driving control and protection circuit, integrated chip auxiliary power circuit, high frequency half bridge inverter circuit and low-pressure sodium lamp start-up circuit; filtering is connected with external ac power source with rectification circuit, and the low-pressure sodium lamp start-up circuit is connected with the low-pressure sodium lamp pipe.

2. a kind of electronic ballast for low pressure sodium lamp circuit according to claim 1, it is characterized in that: described filtering and rectification circuit are made of piezo-resistance RV, inductance L 1, capacitor C 1～C3 and C7 and rectifier bridge BRG1; Described circuit of power factor correction is made of integrated chip IC1, Industrial Frequency Transformer T1, resistance R 1～R9, capacitor C 4～C6 and C8～C11, power MOSFET tube Q1 and diode D1 and D2, and has voltage stabilizing function; Described driving control and protection circuit is made of integrated IC2, diode D7, resistance R 10～R13, electrochemical capacitor C13, R16 and R17, capacitor C 14～C18 and Industrial Frequency Transformer T2; Described integrated chip auxiliary power circuit is to be made of rectifier bridge BRG2 and BRG3, capacitor C 12 and voltage-stabiliser tube LM; Described high frequency half bridge inverter circuit is made of Industrial Frequency Transformer T2, resistance R 14, R15 and R18, power MOSFET tube Q2 and Q3 and diode D5 and D6; Described low-pressure sodium lamp start-up circuit is to be made of inductance L 2, capacitor C 19 and C20.