CN201341263Y

CN201341263Y - Lamp power supply circuit

Info

Publication number: CN201341263Y
Application number: CNU2008201842793U
Authority: CN
Inventors: 杨东平
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-31
Filing date: 2008-12-31
Publication date: 2009-11-04
Anticipated expiration: 2018-12-31

Abstract

The utility model discloses a lamp power supply circuit, which comprises: a multi-switch changing circuit connected and input with a direct current power supply, an output of the multi-switch changing circuit is connected with a primary side of a power transformer, a secondary side of the power transformer is connected with a primary side of a flux leakage high voltage transformer, and a secondary side of the flux leakage high voltage transformer is connected with a lamp by connecting a resonance capacitor; a leakage inductance and resonance capacitor in the flux leakage high voltage transformer forms a resonance circuit, and the secondary side of the power transformer is also connected with a rectification circuit supplying power to a control circuit. The primary side needs not to be connected with the resonance circuit separately due to adoption of the flux leakage high voltage transformer, the resonance circuit is formed by the resonance capacitor of the secondary side and a leakage inductor in the flux leakage high voltage transformer, and the utility model is simple in structure and reduces the cost of the power supply circuit.

Description

A kind of lamp power circuit

Technical field

The utility model relates to power circuit, is meant a kind of lamp power circuit especially.

Background technology

The power supply connection diagram of present ccfl light fixture as shown in Figure 1, comprise the many switch transformed circuits that connect power supply, many switch transformed circuits connect power transformer T1, the output V0 of power transformer T1, be used to connect control chip, T1 connects the resonant circuit of electric capacity and inductance composition, connects light fixture ccfl through transformer T2.Existing this connected mode, owing to connect resonant circuit separately, the cost of power circuit is higher.

The utility model content

In view of this, the utility model is to provide a kind of lamp power circuit, to solve above-mentioned existing power circuit, owing to connect resonant circuit, the cost problem of higher of power circuit separately.

For addressing the above problem, the utility model provides a kind of lamp power circuit, comprising:

The many switch transformed circuits that connect the input power supply, power transformer, leakage field high-tension transformer and resonant capacitance, it is characterized in that, the output of many switch transformed circuits connects the former limit of power transformer, the secondary of power transformer directly connects the former limit of leakage field high-tension transformer, and the secondary of leakage field high-tension transformer connects resonant capacitance, and connects light fixture by resonant capacitance; Leakage inductance in the leakage field high-tension transformer and resonant capacitance are formed resonant circuit, and the secondary of power transformer also is connected with the output rectification circuit to the control circuit power supply, and described leakage field high-tension transformer is more than one.

Owing to adopt the leakage field high-tension transformer, needn't connect resonant circuit separately on former limit, form resonant circuit by the resonant capacitance and the leakage inductance in the leakage field high-tension transformer of secondary, simple in structure, reduced the power circuit cost.

Description of drawings

Fig. 1 is the power circuit schematic diagram of prior art;

Fig. 2 is the power circuit schematic diagram in the utility model.

Embodiment

For clearly demonstrating the technical scheme in the utility model, provide preferred embodiment below and be described with reference to the accompanying drawings.

Referring to Fig. 2, power circuit in the utility model, comprise: many switch transformed circuits connect power transformer T1, power transformer T1 connects output V0, be used for powering to control chip, T1 connects leakage field high-tension transformer T2/T3, and leakage field high-tension transformer T2/T3 connects resonant capacitance C by secondary, connects light fixture ccfl.

Has resonant inductance in the leakage field high-tension transformer T2, resonant inductance in the T2 is formed resonant circuit with the resonant capacitance that is connected, owing to adopt the leakage field high-tension transformer, can be in transformation, form resonant circuit with the resonant capacitance that is connected, the quantity of leakage field high-tension transformer can be for one or more, owing to needn't connect resonant circuit separately on the former limit of leakage field high-tension transformer T2/T3, thus reduced the power circuit cost.

For the power circuit of being set forth among each embodiment of the utility model, all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1, a kind of lamp power circuit, comprise: the many switch transformed circuits that connect the input power supply, power transformer, leakage field high-tension transformer and resonant capacitance, it is characterized in that, the output of many switch transformed circuits connects the former limit of power transformer (T1), the secondary of power transformer (T1) directly connects the former limit of leakage field high-tension transformer (T2) and/or leakage field high-tension transformer (T3), the secondary of leakage field high-tension transformer (T2) and/or leakage field high-tension transformer (T3) connects resonant capacitance, and connects light fixture by resonant capacitance; Leakage inductance in leakage field high-tension transformer (T2) and/or the leakage field high-tension transformer (T3) and resonant capacitance are formed resonant circuit.

2, lamp power circuit according to claim 1 is characterized in that, the secondary of power transformer (T1) also is connected with the output rectification circuit (V0) to the control circuit power supply.

3, lamp power circuit according to claim 1 is characterized in that, described leakage field high-tension transformer is more than one.