CN201726579U

CN201726579U - Wide voltage input electronic ballast circuit

Info

Publication number: CN201726579U
Application number: CN2010202748245U
Authority: CN
Inventors: 俞才龙; 周淑君; 王水平
Original assignee: NINGBO YINZHOU LONGYUAN ILLUMINATED APPLIANCE CO Ltd
Current assignee: Ningbo Longyuan Lighting Electric Appliance Co., Ltd.
Priority date: 2010-07-29
Filing date: 2010-07-29
Publication date: 2011-01-26
Anticipated expiration: 2020-07-29

Abstract

The utility model relates to an electronic ballast, in particular to a wide voltage input electronic ballast circuit, which comprises a full-wave rectification circuit, a power factor correction circuit and positive voltage-multiplying circuit output. Alternating-current input voltage forms the positive voltage-multiplying circuit output through the full-wave rectification circuit and the power factor correction circuit; and output voltage of the positive voltage-multiplying circuit output is electrically connected with a power source of a self-exciting oscillating circuit and supplied to the self-exciting oscillating circuit. The wide voltage input electronic ballast circuit is characterized in that the self-exciting oscillating circuit includes an oscillating triode VT1, an oscillating triode VT2, an avalanche diode VD2 and an oscillating coil, a transmitting electrode of the oscillating triode VT1 is electrically connected with an collecting electrode of the oscillating triode VT2, and the connecting point VA is electrically connected with a connecting point of a resistor R1 and a resistor R2 of the positive voltage-multiplying circuit output. The wide voltage input electronic ballast circuit not only overcomes harmonic distortion, but also has fine high-power factor (PF).

Description

The electronic ballast with wide voltage input circuit

Technical field

The utility model relates to a kind of electric ballast, particularly the electronic ballast with wide voltage input circuit.

Background technology

Existing magnetic tradition ballast uses the iron core electromagnetic component that works in 50Hz. can produce flicker, audible noise during work, efficient is low and harmonic components is high.The inner reactive factor of magnetic ballast is proofreaied and correct (PFC) circuit, and it is also very difficult that pfc circuit is added its inside, thereby causes power factor low.Contain a large amount of harmonic components, do not satisfy IEC 61000-3-2C level international standard that the ballast harmonic wave is lower than the illuminator harmonic current.And, any harmonic wave that produces by ballast also can to around close on other electronic systems and impact.The appearance magnetropism ballast of electric ballast has proposed challenge.It can remedy the deficiency of traditional magnetic ballast, not only flicker free and audible noise during work, and can add PFC easily, have good High Power Factor (PF) and low total harmonic distortion (THD) characteristic.The conventional electronic ballast controller is made of the control IC, gate driving IC and the PFC-IC that separate.IR2166/IR2167 is the electronic ballast control device that Int Rectifier Corp releases. be the representative of electronic ballast control integrated circuit of new generation.This two IC adopts single chip solution. and remove and reduce system cost, reduce outside the number of elements, also simplified installation, improved reliability, saved design time, in electronic ballast control circuit, obtained extensive use.

No matter be IR2166/IR2167, though still L6561D makes ballast flicker free and audible noise, have good High Power Factor (PF) and low total harmonic distortion (THD) characteristic simultaneously, but, more or less have harmonic distortion problems owing to add amplification output after adopting electronics to boost.

Summary of the invention

The purpose of this utility model provides a kind of electronic ballast with wide voltage input circuit that had not only overcome harmonic distortion but also had good High Power Factor (PF).

The purpose of this utility model is to realize like this, the electronic ballast with wide voltage input circuit, it comprises: full-wave rectifying circuit, power factor correction circuit and the output of forward voltage-multiplying circuit, AC-input voltage forms the output of forward voltage-multiplying circuit through full-wave rectifying circuit and power factor correction circuit, the output voltage V CC of forward voltage-multiplying circuit output is electrically connected with the power supply of self-excited oscillation circuit, supply with self-excited oscillation circuit, it is characterized in that: described self-excited oscillation circuit comprises: generator triode VT ₁, VT ₂, avalanche diode VD ₂And oscillator coil, generator triode VT ₁Emitter and VT ₂Collector electrode is electrically connected, and its tie point VA is connected generator triode VT with the resistance R 1 of forward voltage-multiplying circuit output and the electric connection point of R2 ₁The output VCC of collector electrode by the output of protective circuit and forward voltage-multiplying circuit be electrically connected VT ₂The negative power end exported by negative feedback inductor T1D and forward voltage-multiplying circuit of emitter be electrically connected generator triode VT ₁With generator triode VT ₂Base stage separately with separately emitter between be connected in series the parallel circuits of an inductance and diode and a resistance, the parallel circuits of diode and a resistance connects the base stage of triode, generator triode VT ₂Base stage by avalanche diode VD ₂Be electrically connected with the resistance R 2 of the output of forward voltage-multiplying circuit output and the tie point of resistance R 3, resistance R 3 other ends are electrically connected with the negative power end of forward voltage-multiplying circuit output by feedback inductance T1D, two of tie point VA and forward voltage-multiplying circuit output are connected in series between the tie point VB of capacitor C 3 and C4 and connect the elementary of oscillator coil, the secondary fluorescent tube that connects of oscillator coil, tie point in resistance R 2 and resistance R 3 is connected with capacitor C 2 and diode D1 simultaneously, capacitor C 2 other ends are electrically connected with the electric connection point of resistance R 3 and feedback inductance T1D, diode D1 and be electrically connected with described VA point.

Described generator triode VT ₁Collector electrode and VT ₂Emitter between two diode D2 and D3 that oppositely are electrically connected of serial connection, two diode D2 and D3 tie point and generator triode VT that oppositely are electrically connected ₁And VT ₂Electric connection point is electrically connected.

The utility model has the advantages that: because AC-input voltage forms the output of forward voltage-multiplying circuit through full-wave rectifying circuit and power factor correction circuit, the voltage VCC of forward voltage-multiplying circuit output supplies with a self-excited oscillation circuit, produce a high voltage pulse by self-excited oscillation circuit at the two ends of resonant capacitance, the secondary lamp tube ends that is added to by oscillator coil again, like this, self-excited oscillation circuit will produce and exchange self-oscillation, both overcome harmonic distortion, have good High Power Factor again.

Description of drawings

The utility model is described in further detail below in conjunction with the embodiment accompanying drawing:

Fig. 1 is the utility model embodiment circuit theory diagrams;

Fig. 2 is self-excited oscillation circuit 4 schematic diagrames in Fig. 1 circuit.

Among the figure: 1, full-wave rectifying circuit; 2, power factor correction circuit; 3, forward voltage-multiplying circuit output; 4, self-excited oscillation circuit; 5, oscillator coil; 6, fluorescent tube; 7, protective circuit.

Embodiment

As shown in Figure 1, the electronic ballast with wide voltage input circuit, which comprises at least: full-wave rectifying circuit 1, power factor correction circuit 2 and forward voltage-multiplying circuit output 3, AC-input voltage forms forward voltage-multiplying circuit output 3 through full-wave rectifying circuit 1 and power factor correction circuit 2, the voltage VCC of forward voltage-multiplying circuit output 3 supplies with self-excited oscillation circuit 4, produce a high voltage pulse at the two ends of resonant capacitance by self-excited oscillation circuit 4, more secondary fluorescent tube 6 two ends that are added to by oscillator coil 5.

Fig. 2 is a self-excited oscillation circuit 4, and it comprises generator triode VT ₁, VT ₂, avalanche diode VD ₂With oscillator coil 5, generator triode VT ₁Emitter and VT ₂Collector electrode is electrically connected, and its tie point VA is connected generator triode VT with the resistance R 1 of forward voltage-multiplying circuit output 3 and the electric connection point of R2 ₁Collector electrode export 3 output VCC by protective circuit 7 and forward voltage-multiplying circuit and be electrically connected VT ₂Emitter export 3 negative power end by negative feedback inductor T1D and forward voltage-multiplying circuit and be electrically connected generator triode VT ₁With generator triode VT ₂Base stage separately with separately emitter between be connected in series the parallel circuits of an inductance and diode and a resistance, the parallel circuits of diode and a resistance connects the base stage of triode, generator triode VT ₂Base stage by avalanche diode VD ₂Be electrically connected with the resistance R 2 of the output of forward voltage-multiplying circuit output 3 and the tie point of resistance R 3, resistance R 3 other ends are electrically connected with the negative power end of forward voltage-multiplying circuit output 3 by feedback inductance T1D, two of tie point VA and forward voltage-multiplying circuit output 3 are connected in series between the tie point VB of capacitor C 3 and C4 and connect the elementary of oscillator coil 5, the secondary fluorescent tube 6 that connects of oscillator coil 5, tie point in resistance R 2 and resistance R 3 is connected with capacitor C 2 and diode D1 simultaneously, capacitor C 2 other ends are electrically connected with the electric connection point of resistance R 3 and feedback inductance T1D, diode D1 and be electrically connected with described VA point.

At generator triode VT ₁Collector electrode and VT ₂Two diode D2 and D3 that oppositely are electrically connected of serial connection between the emitter, two diode D2 and D3 tie point and generator triode VT that oppositely are electrically connected ₁And VT ₂Electric connection point is electrically connected.

After circuit powers up, AC-input voltage forms forward voltage-multiplying circuit output 3 through full-wave rectifying circuit 1 and power factor correction circuit 2, the voltage VCC of forward voltage-multiplying circuit output 3 supplies with self-excited oscillation circuit 4, produce a high voltage pulse at the two ends of resonant capacitance by self-excited oscillation circuit 4, more secondary fluorescent tube 6 two ends that are added to by oscillator coil 5.

Fig. 2 is the working circuit diagram of self-excited oscillation circuit 4, in Fig. 2, through resistance R ₁Electric current to capacitor C ₂Capacitor C is worked as in charging ₂The voltage at two ends reaches bidirectional trigger diode VD ₂Trigger voltage (being approximately about 35V) time, VD ₂Avalanche breakdown, at this moment capacitor C ₂By switching tube VT ₂The discharge of base stage → emitter, VT ₂Because of the conducting of emitter junction positively biased, at VT ₂Conduction period, current path is: VCC → C3 → primary coil T1A → VT ₂Collector electrode → VT ₂Emitter → ground, switching tube VT ₂The transient change of collector current is di/dt, by the elementary oscillator coil T of oscillator coil 5 _1ASecondary winding produce corresponding induced electromotive force supply load fluorescent tube 6, consequently VT ₂Base potential raise, base current and collector current further increase, because positive feedback makes switching tube VT ₂Jumped to the saturation conduction operating state, at VT ₂During the saturation conduction, start capacitor C ₂By bidirectional diode VD ₂With switching tube VT ₂Emitter junction discharge.

Start-up circuit R1, C ₂And VD ₂For the starting of oscillation of circuit provides the starting of oscillation condition of work, in case after circuit oscillation got up, it was to realize by the positive feedback that oscillator coil T1A, T1B and T1C are provided that circuit is kept vibration.As switch VT ₂After reaching capacity, the induced electromotive force of oscillator coil T1A, T1B and T1C is zero, VT ₂Base potential begin to descend, the base current of VT2 descends, and causes the collector current of VT2 to descend, and VT at this moment ₁Base potential begin to rise, this variation is because the effect of positive feedback makes VT ₂End VT ₁Saturation conduction is at VT ₁During the saturation conduction, the current path of lamp load is: VT ₁Collector electrode → VT ₁Emitter → VA → VB → ground.Work as VT ₁Behind the saturation conduction, positive feedback transformer T causes vibrating ₁Enter the magnetic saturation state again, same because T ₁Positive feedback make VT again ₂Saturated, VT ₁End, so go round and begin again, VT ₁And VT ₂Alternately saturated, end, make circuit enter the oscillatory work state, by oscillator coil T1A and C ₂The resonant circuit generation series resonance of forming produces a high voltage pulse at resonant capacitance and is added to fluorescent tube 6 two ends, fluorescent tube 6 is started enter operating state.

Because circuit working is in higher-order of oscillation operating state, so it is very little that the value of ballast inductance can obtain, if for example the fluorescent lamp of 40W is adopted inductance ballast then needs the ballast inductance of the inductance value of about 800mH, volume and quality are all bigger, and to the electronic ballast circuit of the higher-order of oscillation, inductance value to the ballast inductance in the electronic ballast for fluoresent lamp of 40W only needs 2mH equally, so volume and quality are all much smaller.

Claims

1. electronic ballast with wide voltage input circuit, it comprises: full-wave rectifying circuit (1), power factor correction circuit (2) and forward voltage-multiplying circuit output (3), the output voltage V CC of forward voltage-multiplying circuit output (3) is electrically connected with the power supply of self-excited oscillation circuit (4), and it is characterized in that: described self-excited oscillation circuit (4) comprising: generator triode VT ₁, VT ₂, avalanche diode VD ₂And oscillator coil, generator triode VT ₁Emitter and VT ₂Collector electrode is electrically connected, and its tie point VA is connected generator triode VT with the resistance R 1 of forward voltage-multiplying circuit output and the electric connection point of R2 ₁The output VCC of collector electrode by protective circuit and forward voltage-multiplying circuit output (3) be electrically connected VT ₂The emitter negative power end of exporting (3) by negative feedback inductor T1D and forward voltage-multiplying circuit be electrically connected generator triode VT ₁With generator triode VT ₂Base stage separately with separately emitter between be connected in series the parallel circuits of an inductance and diode and a resistance, the parallel circuits of diode and a resistance connects the base stage of triode, generator triode VT ₂Base stage by avalanche diode VD ₂Be electrically connected with the resistance R 2 of the output of forward voltage-multiplying circuit output (3) and the tie point of resistance R 3, resistance R 3 other ends are electrically connected with the negative power end of forward voltage-multiplying circuit output (3) by feedback inductance T1D, two of tie point VA and forward voltage-multiplying circuit output are connected in series between the tie point VB of capacitor C 3 and C4 and connect the elementary of oscillator coil (5), the secondary fluorescent tube (6) that connects of oscillator coil (5), tie point in resistance R 2 and resistance R 3 is connected with capacitor C 2 and diode D1 simultaneously, capacitor C 2 other ends are electrically connected with the electric connection point of resistance R 3 and feedback inductance T1D, diode D1 and be electrically connected with described VA point.

2. electronic ballast with wide voltage input circuit according to claim 1 is characterized in that: described generator triode VT ₁Collector electrode and VT ₂Emitter between two diode D2 and D3 that oppositely are electrically connected of serial connection, two diode D2 and D3 tie point and generator triode VT that oppositely are electrically connected ₁And VT ₂Electric connection point is electrically connected.