CN201789670U

CN201789670U - Regulated ultraviolet lamp ballast

Info

Publication number: CN201789670U
Application number: CN2010202764318U
Authority: CN
Inventors: 袁向东; 文北林; 袁在田
Original assignee: BEIJING COLINS BAY TECHNOLOGY Co Ltd
Current assignee: BEIJING COLINS BAY TECHNOLOGY Co Ltd
Priority date: 2010-07-30
Filing date: 2010-07-30
Publication date: 2011-04-06
Anticipated expiration: 2020-07-30

Abstract

The utility model relates to a regulated ultraviolet lamp ballast, which comprises a filter circuit, a rectifier circuit, a half-bridge circuit, a control circuit, a ballast circuit and a low-frequency modulation waveform generator, the filter circuit is connected with the rectifier circuit, the rectifier circuit is connected with the half-bridge circuit, the half-bridge circuit is connected with the control circuit, the control circuit is connected with the ballast circuit, and the ballast circuit is also connected with the low-frequency modulation waveform generator. The utility model has advantages that: firstly, the working frequency and corresponding output power of the circuits can be optimized according to the working conditions of a target load; secondly, the L/C resonant network in the control circuit reduces resonance loss, thus dispensing with the air gap in a magnetic circuit, decreasing the heat productivity and increasing the safety factor; and thirdly, the low-frequency modulation waveform generator not only can break down the acoustic resonance-generating conditions of a light tube, thus enhancing the working stability, but also can ensure that the electromagnetic radiation energy spectrum generated by the circuits can be distributed within a broader frequency band range, thus reducing electromagnetic interference.

Description

A kind of voltage stabilizing ultra-violet lamp ballast

Technical field

The utility model relates to ballast, refers in particular to a kind of voltage stabilizing ultra-violet lamp ballast.

Background technology

The electric ballast of ultraviolet lamp tube is to be direct voltage by the ac voltage rectifier with civil power, utilize power switch that direct voltage is boosted and voltage stabilizing again, be transformed into high-voltage dc voltage, be converted to the alternating voltage of high frequency then through power switch, output HIGH voltage ignition voltage when fluorescent tube is not lighted, start ultraviolet lamp tube, when ultraviolet lamp tube normal luminous after control output constant current, the constant current of ultraviolet lamp tube when starting required high voltage to stable operation is by electronic ballast control.Existing ultraviolet lamp tube electric ballast generally adopts the self-resonance circuit framework.Bring following shortcoming thus: at first, need start-up circuit; Secondly, at the such certain loads of ultraviolet lamp tube, need to adopt the high-tension transformer of magnetic core band air-gap (preventing that magnetic material is saturated), owing to reasons such as magnetic resistance increase and conductor skin effect between the magnetic core air gap, cause this device local overheating, have a strong impact on life-span and reliability; The 3rd, output power of circuit is subject to multiple factor affecting: the L-C resonance frequency, and the structure of former parts or technological parameter, condition of work and load variations etc., these strong dependences make device performance be difficult for simple the adjustment.The consistency that is the matching of load and batch process is relatively poor; At last, the circuit work frequency servo-actuated very easily triggers ultraviolet lamp tube and produces acoustic resonance in the variation of loaded work piece state, faults such as electric arc disorder even breath arc.

The utility model content

In view of this, main purpose of the present utility model is to provide a kind of better load matched that has, and can reduce circuit loss, increases work efficiency and effective voltage stabilizing ultra-violet lamp ballast that suppresses acoustic resonance.

For achieving the above object, the technical solution of the utility model is achieved in that a kind of voltage stabilizing ultra-violet lamp ballast, comprising: filter circuit, rectification circuit, half-bridge circuit, control circuit, ballasting circuit, and low frequency modulations waveform generator, described filter circuit connects rectification circuit, rectification circuit connects half-bridge circuit, described half-bridge circuit connects control circuit, and described control circuit connects ballasting circuit, and described ballasting circuit also is connected with the low frequency modulations waveform generator.

Described filter circuit is made up of L1, C1.

Described rectification circuit comprises the bridge rectifier of being made up of diode D1, D2, D3 and D4, and its input connects L1 and the C1 in the filter circuit, and circuit output end also meets filter capacitor C2.

Described half-bridge circuit mainly comprises MOS power switch pipe VT1 and the VT2 that two topologys connect.

Described control circuit mainly comprises the series resonant circuit that L, C form.

Described ballasting circuit mainly comprises the oscillator of being made up of coil and capacitor C 2.

The utility model has following beneficial effect with respect to prior art:

First, the operating frequency of circuit and pairing power output thereof can be adjusted by simple means, can do optimization process at the targeted loads operating mode, thereby different model, different manufacturers, different batches, the different ultraviolet lamp tube of parameter are had best load suitability.

Second, the L/C series resonance of control circuit makes circuit working at ZVS (zero voltage switch) state, to reduce the switching loss of power device, operating frequency changes more than resonant frequency point, can adjust power output effectively, and make high-tension transformer reduce resonance loss, thereby cancelled the air gap in the magnetic circuit, reduce caloric value, improved coefficient of safety, also reduced the process complexity when producing in batches simultaneously.

The 3rd, the low frequency modulations waveform generator makes actual operating frequency center on master oscillator frequenc and does swing among a small circle in order to operating frequency is made low frequency modulations.Not only can destroy the condition that fluorescent tube produces acoustic resonance, increase job stability, and the electromagnetic radiation power spectrum that makes circuit produce is distributed in wideer frequency band range, thereby reduced EMI (electromagnetic interference), suppresses effectively even eliminated disadvantages such as fluorescent tube acoustic resonance, electric arc disorder, breath arc.

Description of drawings

Fig. 1 is a structure principle chart of the present utility model;

Fig. 2 is a physical circuit schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, a kind of voltage stabilizing ultra-violet lamp ballast of the present utility model comprises: filter circuit, rectification circuit, half-bridge circuit, control circuit, ballasting circuit, and low frequency modulations waveform generator, described filter circuit connects rectification circuit, rectification circuit connects half-bridge circuit, described half-bridge circuit connects control circuit, and described control circuit connects ballasting circuit, and described ballasting circuit also is connected with the low frequency modulations waveform generator.

With reference to Fig. 2, civil power 220V is input to filter circuit through the overcurrent-overvoltage protecting circuit that includes fuse, and this filter circuit is made up of L1, C1.Rectification circuit comprises the bridge rectifier of being made up of diode D1, D2, D3 and D4, its input connects L1 and the C1 in the filter circuit, circuit output end also connects capacitor C 2, and as filtering, this rectification circuit provides DC bus-bar voltage to the major loop of being made up of half-bridge circuit and control circuit.

Half-bridge circuit mainly comprises the MOS power switch pipe VT1 and the VT2 of two topologys; the grid of VT1 is connected the series resonant circuit that L, C form with the drain electrode of VT2; L/C series resonant circuit and other attached detection constitute control circuit with protective circuit; this L/C series resonant circuit connects transformer T; VT1 and VT2 are logical at the instruction lower whorl conductance of controller, and the primary current of alternation is provided for transformer T.The L/C series resonant circuit makes circuit working at ZVS (zero voltage switch) state, and to reduce the switching loss of power device, operating frequency changes more than resonant frequency point, can adjust power output effectively.

Ballasting circuit mainly comprises the oscillator of being made up of coil and capacitor C 2, be used to provide the high voltage of lighting quartz burner, low frequency modulations waveform generator IC2 is that the operating frequency of oscillator is made low frequency modulations, makes actual operating frequency center on master oscillator frequenc and does swing among a small circle.Its effect not only can destroy the condition that fluorescent tube produces acoustic resonance, increases job stability; And make the electromagnetic radiation power spectrum of circuit generation be distributed in wideer frequency band range, thereby reduced electromagnetic interference.

The above is preferred embodiment of the present utility model only, is not to be used to limit protection range of the present utility model.

Claims

1. voltage stabilizing ultra-violet lamp ballast, it is characterized in that, comprising: filter circuit, rectification circuit, half-bridge circuit, control circuit, ballasting circuit, and low frequency modulations waveform generator, described filter circuit connects rectification circuit, rectification circuit connects half-bridge circuit, described half-bridge circuit connects control circuit, and described control circuit connects ballasting circuit, and described ballasting circuit also is connected with the low frequency modulations waveform generator.

2. a kind of voltage stabilizing ultra-violet lamp ballast as claimed in claim 1 is characterized in that described filter circuit is made up of L1, C1.

3. a kind of voltage stabilizing ultra-violet lamp ballast as claimed in claim 2, it is characterized in that, described rectification circuit comprises the bridge rectifier that diode D1, D2, D3 and D4 form, and its input connects L1 and the C1 in the filter circuit, and circuit output end also meets filter capacitor C2.

4. a kind of voltage stabilizing ultra-violet lamp ballast as claimed in claim 3 is characterized in that, described half-bridge circuit mainly comprises MOS power switch pipe VT1 and the VT2 that two topologys connect.

5. a kind of voltage stabilizing ultra-violet lamp ballast as claimed in claim 4 is characterized in that, described control circuit mainly comprises the series resonant circuit that L, C form.

6. a kind of voltage stabilizing ultra-violet lamp ballast as claimed in claim 5 is characterized in that described ballasting circuit mainly comprises the oscillator of being made up of coil and capacitor C 2.