CN202150984U - High power factor electronic ballast - Google Patents
High power factor electronic ballast Download PDFInfo
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- CN202150984U CN202150984U CN201120231684U CN201120231684U CN202150984U CN 202150984 U CN202150984 U CN 202150984U CN 201120231684 U CN201120231684 U CN 201120231684U CN 201120231684 U CN201120231684 U CN 201120231684U CN 202150984 U CN202150984 U CN 202150984U
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Abstract
The utility model relates to an electronic ballast and a circuit of the same. The circuit is composed of an anti-electromagnetic interference circuit, a bridge rectifying circuit for anti-voltage fluctuation, a semi-bridge inverter circuit for changing the flow direction of current, a resonance circuit, and a feedback circuit for raising a power factor. The bridge rectifying circuit is connected with the anti-electromagnetic interference circuit and the feedback circuit for rectification and voltage stabilization. The semi-bridge inverter circuit is connected with the bridge rectifying circuit and the resonance circuit for converting direct current into alternating current. The resonance circuit is connected with the semi-bridge inverter circuit and the feedback circuit for frequency selection. The feedback circuit is connected with the resonance circuit, the anti-electromagnetic interference circuit and the bridge rectifying circuit for the feedback of oscillating current to an input terminal to compensate front segment current waveform, so that the current waveform is consistent with voltage waveform, the power is increased, and the power factor can reach 0.95 to 0.99. The electronic ballast and the circuit of the same help to increase the power factor, and the circuit is simple and of low cost.
Description
Technical field
The utility model relates to a kind of electric ballast, relates in particular to a kind of high power factor electronic ballast that is used for illuminating lamp.
Background technology
If electricity-saving lamp does not adopt measure of power factor correction, the source current harmonic content of input is too high, can cause severe contamination to electric power system, has influence on the electric circumstance of whole electric power system, comprises electric power system itself and users.This problem to electricity-saving lamp also has correlation process method, and like the patent No. 96119870.2, name is called circuit and the product that electronic ballast for fluoresent lamp improves power factor.Though this electric ballast can improve power factor, the inside increases multiple inductance and other components and parts, and circuit structure is complicated, and cost is high.
Summary of the invention
The purpose of the utility model is to improve the power factor of electricity-saving lamp, compared with prior art also will make circuit simple, and cost is low.For the circuit of realizing above-mentioned purpose the utility model by constituting with lower component: being used for the anti-electromagnetic interference circuit of incoming transport electricity input, is galvanic bridge rectifier with AC rectification, direct current is changed into the half bridge inverter circuit device circuit of square wave alternating-current electricity; Cause the resonant circuit of current oscillation; Realize the feedback circuit of power factor correction, load is characterized in that; Said protective circuit comprises half bridge inverter circuit; Resonant circuit, feedback circuit, said half bridge inverter circuit is connected with bridge rectifier resonant circuit; Resonant circuit is connected with feedback circuit with half bridge inverter circuit, and feedback circuit is connected with bridge rectifier, anti-electromagnetic interference circuit with resonant circuit.
Half bridge inverter circuit device circuit; Comprise: two transistor Ts 1, T2, inductance L 3, the T1 collector electrode is connected with capacitor C 1, C2, C5, resistance R 5, diode D3, D4; The T1 emitter-base bandgap grading is connected with resistance R 3, diode D5; The T1 base stage is connected with resistance R 2, R3, diode D5, and the base stage of T2 is connected with resistance R 1, R6, diode D6, and the T2 collector electrode is connected with resistance R 1, R3, inductance L 3; The emitter-base bandgap grading of T2 is connected with resistance R 4, diode D6, and inductance L 3 is connected with resistance R 1, R3, T2 current collection collection, inductance L 4.
Resonant circuit comprises: capacitor C 4, C5, inductance L 4, inductance L 4 and inductance L 3, fluorescent tube LAMP, electric capacity
C4 connects, and capacitor C 4 is connected with fluorescent tube LAMP, capacitor C 5, C6, inductance L 4, and capacitor C 5 is connected with capacitor C 1, C2, C4, C6, diode D3, D4, fluorescent tube LAMP, resistance R 5, T1 collector electrode.
Feedback circuit comprises capacitor C 6, and capacitor C 6 is connected with capacitor C 4, C5, inductance L 2, diode D4, D1.
The utility model has been realized the raising of power factor of energy-saving lamp, can power factor be brought up to 0.95-0.99, and compared with prior art the circuit structure of the utility model is simple, and cost is low.
Description of drawings
Below in conjunction with accompanying drawing 1 and execution mode the utility model is further specified;
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
According to circuit diagram shown in Figure 1; The bridge rectifier that diode D1, D2, D3, D4 constitute is accomplished rectification function, and alternating current arrives bridge rectifier mid point 1,2, after the bridge rectifier rectification; The high-order voltage of rectification circuit port 3 outputs, port 4 output low level voltages.3,4 output voltages of bridge rectifier port are greater than voltage on the capacitor C 1, and capacitor C 1 is charged, and 3,4 output voltages of port are less than voltage on the capacitor C 1, and electric capacity discharges, and diode D1, D2, D3, D4 and capacitor C 1 play pressure stabilization function.
The semi-bridge type inverter circuit is made up of the transistor base driving loop of band coupling capacitance among Fig. 1; Behind the power connection; Transistor T 2 at first provides a base stage trigger current and conducting by resistance R 1, R5 etc.; After the T2 conducting, current direction is: C1+ → C5 → LAMP → C4 → LAMP → L4 → L3 → T2 → C1-, and electric current charges to C4; When T2 by and during the T1 conducting, current path then is: C4 → LAMP → C5 → T1 → L3 → L4 → LAMP → C4, this current direction is the C4 discharge loop.By means of the elementary winding positive feedback of pulse transforming L3, make T1, the T2 alternate conduction causes the LC series circuit generation resonance that L4, C4 and C5 form, and produces the high-voltage pulse of a 600V～1200V at the C4 two ends, and lamp is lighted.C6 feeds back to front end with oscillating current, compensation front end current waveform, and when front end current waveform and voltage waveform basically identical, power factor has just improved, and can reach 0.95-0.99.
Claims (4)
1. circuit of electronic ballast comprises: being used for the anti-electromagnetic interference circuit of incoming transport electricity input, is galvanic bridge rectifier with AC rectification; Change direct current into square wave alternating-current electric half bridge inverter circuit device circuit, cause the resonant circuit of current oscillation, realize the feedback circuit of power factor correction; Load; It is characterized in that said protective circuit comprises half bridge inverter circuit, resonant circuit; Feedback circuit; Said half bridge inverter circuit is connected with bridge rectifier resonant circuit, and resonant circuit is connected with feedback circuit with half bridge inverter circuit, and feedback circuit is connected with bridge rectifier, anti-electromagnetic interference circuit with resonant circuit.
2. circuit of electronic ballast according to claim 1 is characterized in that, described half bridge inverter circuit device circuit comprises: two transistor Ts 1, T2; Inductance L 3; The T1 collector electrode is connected with capacitor C 1, C2, C5, resistance R 5, diode D3, D4, and the T1 emitter-base bandgap grading is connected with resistance R 3, diode D5, and the T1 base stage is connected with resistance R 2, R3, diode D5; The base stage of T2 is connected with resistance R 1, R6, diode D6; The T2 collector electrode is connected with resistance R 1, R3, inductance L 3, and the emitter-base bandgap grading of T2 is connected with resistance R 4, diode D6, and inductance L 3 is connected with resistance R 1, R3, T2 current collection collection, inductance L 4.
3.. electric ballast according to claim 1; It is characterized in that; Described circuit resonance circuit comprises: capacitor C 4, C5, inductance L 4; Inductance L 4 is connected with inductance L 3, fluorescent tube LAMP, capacitor C 4, and capacitor C 4 is connected with fluorescent tube LAMP, capacitor C 5, C6, inductance L 4, and capacitor C 5 is connected with capacitor C 1, C2, C4, C6, diode D3, D4, fluorescent tube LAMP, resistance R 5, T1 collector electrode.
4. electric ballast according to claim 1 is characterized in that, described feedback circuit comprises capacitor C 6, and capacitor C 6 is connected with capacitor C 4, C5, inductance L 2, diode D4, D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120231684U CN202150984U (en) | 2011-07-04 | 2011-07-04 | High power factor electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120231684U CN202150984U (en) | 2011-07-04 | 2011-07-04 | High power factor electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202150984U true CN202150984U (en) | 2012-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120231684U Expired - Fee Related CN202150984U (en) | 2011-07-04 | 2011-07-04 | High power factor electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202150984U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066858A (en) * | 2013-01-22 | 2013-04-24 | 广东新昇电业科技股份有限公司 | Voltage feedback type half-bridge circuit |
-
2011
- 2011-07-04 CN CN201120231684U patent/CN202150984U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066858A (en) * | 2013-01-22 | 2013-04-24 | 广东新昇电业科技股份有限公司 | Voltage feedback type half-bridge circuit |
| CN103066858B (en) * | 2013-01-22 | 2016-09-07 | 广东新昇电业科技股份有限公司 | A kind of voltage feedback type half-bridge circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120222 Termination date: 20130704 |