CN101483960A - Light control matching circuit for discharge lamp - Google Patents

Abstract

The invention provides a discharge lamp dimming collocating circuit which includes: a resonator cell that has a first capacitance and a second capacitance connected in series, and a first inductance parallel connected with the serie combination of the first capacitance and the second capacitance; a rectifier cell connected with the resonator cell; a half-bridge output cell that has two electric control switches parallel connected with the rectifier cell; and a voltage feedback cell that mainly has a second inductance, a third capacitance and a fourth capacitance connected in series; wherein, resonance frequency of the resonator cell is about a preset times of working frequency of the half-bridge output cell. The circuit provided by the invention can adjust light to the discharge lamp collocating a standard dimmer, and can avoid flicker phenomenon, the circuit has high market acceptance for low cost.

Description

Light control matching circuit for discharge lamp

Technical field

The present invention is relevant with the light modulating device of discharge lamp, is meant especially to be used for arranging in pairs or groups general commercially available standard dimmers, and has a kind of light control matching circuit for discharge lamp low-cost and effect of not glimmering.

Background technology

Press, the discharge lamp of known commercially available tunable optical or the light adjusting type electric stabilizer that fluorescent tube is used use the frequency conversion function of IC (integrated circuit) chip to carry out brightness adjustment control usually at present.Yet the IC chip that this kind has frequency conversion function is not cheap, makes the discharge lamp of this kind tunable optical or the price of light adjusting type electric stabilizer remain high, and the degree that the consumer accepts is not high.

In addition, the someone proposes not use the IC chip with frequency conversion function, and cooperates dimmer to use.Yet it can produce scintillation because can't keep electric current in the accent process, when serious even can burn discharge lamp or burn dimmer, and glimmer and also can cause the discomfort of user's eyes.

Summary of the invention

The object of the present invention is to provide a kind of light control matching circuit for discharge lamp, its general commercially available standard dimmers of can arranging in pairs or groups is kept electric current in the process to the discharge lamp light modulation, avoid the generation of scintillation.Simultaneously can not use the IC chip with frequency conversion function, and only use assembly cheaply, it is with low cost, and the market acceptance is higher.

For achieving the above object, light control matching circuit for discharge lamp provided by the invention includes:

One resonant element mainly has one first electric capacity and one second electric capacity is in series, and has the tandem compound that one first inductance is parallel to this first electric capacity and this second electric capacity;

One rectification unit is connected in this resonant element, in order to transfer alternating current to direct current;

Half-bridge output unit mainly has two electric-controlled switchs and is in series, and is connected in this rectification unit, and respectively this electric-controlled switch has a control end, and respectively this control end is connected to an oscillating unit; And

One voltage feedback unit mainly has one second inductance, one the 3rd electric capacity and one the 4th electric capacity and is in series, and this voltage feedback unit is connected in this half-bridge output cell, and is connected in this rectification unit;

Wherein, the resonance frequency of this resonant element is approximately the prearranged multiple of the operating frequency of this half-bridge output cell.

Described light control matching circuit for discharge lamp, wherein: the resonance frequency of resonant element is prearranged multiple ± 10% of the operating frequency of this half-bridge output cell.

Described light control matching circuit for discharge lamp, wherein: this prearranged multiple is an integral multiple.

Described light control matching circuit for discharge lamp, wherein: this prearranged multiple is 1/N times, and wherein N is a natural number.

Described light control matching circuit for discharge lamp, wherein: this resonant element also has 2 the 3rd inductance, and this 2 the 3rd inductance is connected to the two ends of this second electric capacity with the one end, this 2 the 3rd inductance and be connected to the two ends of one the 5th electric capacity with its other end.

Described light control matching circuit for discharge lamp, wherein: this rectification unit is a bridge rectifier.

Described light control matching circuit for discharge lamp, wherein: respectively this electric-controlled switch is a transistor.

Described light control matching circuit for discharge lamp, wherein: respectively this oscillating unit is a RL oscillation circuit, is in series by a resistance and an inductance.

As from the foregoing, the attainable effect of the present invention is:

One, light modulation process can not glimmered: the present invention utilizes the resonance frequency multiple of resonant element and half-bridge output cell relation, reach the effect of the bring to power factor and holding current, behind the dimmer that is connected, can avoid TRIAC (bidirectional silicon-controlled body) cutout on the dimmer, further avoid the problem of flicker.

Two, with low cost: the present invention utilizes the resonance frequency multiple of resonant element and half-bridge output cell relation, therefore need not use the frequency conversion function of IC chip, can reach to avoid the effect of glimmering; The present invention only uses assembly cheaply, and it is with low cost, and the market acceptance is higher.

Description of drawings

Fig. 1 is the circuit structure diagram of a preferred embodiment of the present invention.

Fig. 2 is the frequency multiplication sequential chart of a preferred embodiment of the present invention.

Fig. 3 is the standard dimmer circuits structure chart of a preferred embodiment of the present invention.

Fig. 4 is the power factor correcting current waveform figure of a preferred embodiment of the present invention.

Primary clustering symbol description in the accompanying drawing:

10 light control matching circuit for discharge lamp

11 resonant elements

21 rectification units

31 half-bridge output cell

41 voltage feedback unit

51 standard dimmers

The bidirectional silicon-controlled body of 51 TRIAC

99 discharge lamps

C1 first electric capacity

C2 second electric capacity

C3 the 3rd electric capacity

C4 the 4th electric capacity

C5 the 5th electric capacity

L1 first inductance

L2 second inductance

L3 the 3rd inductance

N1, the N2 power input

Q1, the Q2 electric-controlled switch

The G control end

Embodiment

Light control matching circuit for discharge lamp provided by the invention includes: a resonant element mainly has one first electric capacity and one second electric capacity is in series, and has the tandem compound that one first inductance is parallel to this first electric capacity and this second electric capacity; One rectification unit is connected in this resonant element, in order to transfer alternating current to direct current; Half-bridge output unit mainly has two electric-controlled switchs and is in series, and is connected in this rectification unit, and respectively this electric-controlled switch has a control end, and respectively this control end is connected to an oscillating unit; And a voltage feedback unit, mainly having one second inductance, one the 3rd electric capacity and one the 4th electric capacity and be in series, this voltage feedback unit is connected in this half-bridge output cell, and is connected in this rectification unit; Wherein, the resonance frequency of this resonant element is approximately the prearranged multiple of the operating frequency of this half-bridge output cell.Thus, the standard dimmers of can arranging in pairs or groups is come to the discharge lamp light modulation, and can avoid the generation of scintillation, and it is with low cost, and the market acceptance is higher.

In order to describe structure of the present invention and characteristics place in detail, lift the explanation of a following preferred embodiment and conjunction with figs. as after, wherein:

As shown in Figure 1, a kind of light control matching circuit for discharge lamp 10 that a preferred embodiment of the present invention provided, can carry out dimming function in order to the standard dimmers 51 of arranging in pairs or groups, this light control matching circuit for discharge lamp 10 of the present invention mainly is made up of a resonant element 11, a rectification unit 21, half-bridge output unit 31 and a voltage feedback unit 41, wherein:

This resonant element 11 mainly has one first capacitor C 1 and one second capacitor C 2 is in series, and has the tandem compound that one first inductance L 1 is parallel to this first capacitor C, 1 this second capacitor C 2.This resonant element 11 also has 2 the 3rd inductance L 3, this 2 the 3rd inductance L 3 is connected to the two ends of this second capacitor C 2 with the one end, this 2 the 3rd inductance L 3 and be connected to the two ends of one the 5th capacitor C 5 with its other end, the two ends of the 5th capacitor C 5 are also as two power input N1, N2 simultaneously.

This rectification unit 21 is connected in this resonant element 11, in order to transfer alternating current to direct current.This rectification unit 21 is a bridge rectifier in present embodiment.

This half-bridge output cell 31 mainly has two electric-controlled switch Q1, and Q2 and being in series is connected in this rectification unit 21, this electric-controlled switch Q1 respectively, and Q2 has a control end G, and respectively this control end G is connected to an oscillating unit 35.This electric-controlled switch Q1 respectively, Q2 is a transistor in present embodiment.And respectively this oscillating unit 35 is a RL oscillation circuit in present embodiment, is in series by a resistance R and an inductance L.

This voltage feedback unit 41 mainly has one second inductance L 2, one the 3rd capacitor C 3 and one the 4th capacitor C 4 and is in series, and this voltage feedback unit 41 is connected in this half-bridge output cell 31, and is connected in this rectification unit 21.

Wherein, the resonance frequency of this resonant element 11 is approximately the prearranged multiple of the operating frequency of this half-bridge output cell 31.Again in detail, it is prearranged multiple ± 10%.And this prearranged multiple can be integral multiple or 1/N doubly (N is a natural number), for example 1 times, 2 times, 3 times, 1/2 times, 1/3 times, 1/4 times or the like ....Be to illustrate with 1/2 times ± 10% in the present embodiment, under this situation, the operating frequency of this half-bridge output cell 31 is about 55KHz, so the resonance frequency of this resonant element 11 is about 27KHz, and the relation of this kind frequency multiplication sequential is shown in Fig. 2.The value that the resonance frequency of this resonant element 11 can be adjusted this first capacitor C 1, this second capacitor C 2 and this first inductance L 1 by following (1) formula is to obtain:

$f=\frac{1}{2\mathrm{\&pi;}\sqrt{\mathrm{LC}}}=\frac{1}{2\mathrm{\&pi;}\sqrt{\frac{1}{\frac{1}{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A200810002417E00101.png"\; state="\{\{state\}\}">C</figure-callout>}1}+\frac{1}{C2}}+\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="A200810002417E00101.png"\; state="\{\{state\}\}">L</figure-callout>}1}}$ Formula (1)

The present invention can be connected in use a standard dimmers 51 (being shown in Fig. 3) and a discharge lamp 99, this standard dimmers 51 is connected in this two power input N1, N2, and can adjust the brightness of discharge lamp 99 by this standard dimmers 51.99 of this discharge lamps are connected in this second inductance L 2 and this rectification unit 21.The circuit framework of this standard dimmers 51 is shown in Fig. 3, because it is a known construction, its assembly and operating principle hold not to be given unnecessary details.

Setting by said structure and frequency, the resonance frequency of this resonant element 11 is 1/2 times of operating frequency of this half-bridge output cell 31, can stop the 3rd capacitor C 3 feedback currents to this two power input N1 with this, N2, and then effectively improved the interference of EMI.

When carrying out light modulation, with fluorescent tube by high light in dark process, the power of input progressively descends, can produce " ring " phenomenon (ringing is illustrated in hypomere) simultaneously, this moment, this first inductance L, 1 stored electric energy can make this standard dimmers 51 can obtain enough electric currents of keeping, make that the TRIAC (bidirectional silicon-controlled body) 52 in this standard dimmers 51 is not stopped, therefore do not have the problem of discharge lamp 99 flickers.In addition, exist dc impedance by this first inductance L 1, can effectively be arrested in caused in the light modulation process " ring " amplitude, further suppress 51 issuable cutout phenomenons of this standard dimmers, further avoid the flicker problem in the light modulation process.

Above-mentioned " ring " phenomenon, mainly be because at the inductance and the electric capacity at the input position of general circuit, its combination exists intrinsic resonance frequency, and include a large amount of high order harmonic components in the forward position electric current of dimmer, simultaneously also exist the electric current identical in these high order harmonic components, produce the phenomenon of vibration and can interact with aforementioned resonance frequency.

When the input power supply, this discharge lamp 99 is activated and produces light tube electric voltage and electric current, obtain a feedback voltage by the place that this second inductance L 2 is connected with discharge lamp 99, owing to producing resonance, the multiple relation of the operating frequency of the resonance frequency of this resonant element 11 and this half-bridge output cell 31 improved feedback voltage, therefore can further improve power factor and made this standard dimmers 51 that the conducting electric current all be arranged in the whole half period of electric current, the voltage waveform of conducting electric current and input current can keep the situation of conducting and can not glimmer with this as shown in Figure 4.In addition, by the flash-over characteristic of discharge lamp 99, can make fluorescent tube in that its modulating voltage can be from normally up soaring rapidly when dark by high light, therefore feedback voltage also can rise thereupon, make power factor further improve, and reach the effect that above-mentioned power factor improves, more feasiblely can not produce scintillation.

Claims (8)

1, a kind of light control matching circuit for discharge lamp includes:

One resonant element mainly has one first electric capacity and one second electric capacity is in series, and has the tandem compound that one first inductance is parallel to this first electric capacity and this second electric capacity;

One rectification unit is connected in this resonant element, in order to transfer alternating current to direct current;

Half-bridge output unit mainly has two electric-controlled switchs and is in series, and is connected in this rectification unit, and respectively this electric-controlled switch has a control end, and respectively this control end is connected to an oscillating unit; And

One voltage feedback unit mainly has one second inductance, one the 3rd electric capacity and one the 4th electric capacity and is in series, and this voltage feedback unit is connected in this half-bridge output cell, and is connected in this rectification unit;

Wherein, the resonance frequency of this resonant element is approximately the prearranged multiple of the operating frequency of this half-bridge output cell.

2, according to the described light control matching circuit for discharge lamp of claim 1, wherein: the resonance frequency of resonant element is prearranged multiple ± 10% of the operating frequency of this half-bridge output cell.

3, according to the described light control matching circuit for discharge lamp of claim 2, wherein: this prearranged multiple is an integral multiple.

4, according to the described light control matching circuit for discharge lamp of claim 2, wherein: this prearranged multiple is 1/N times, and wherein N is a natural number.

5, according to the described light control matching circuit for discharge lamp of claim 1, wherein: this resonant element has 2 the 3rd inductance, this 2 the 3rd inductance is connected to the two ends of this second electric capacity with the one end, this 2 the 3rd inductance and be connected to the two ends of one the 5th electric capacity with its other end.

6, according to the described light control matching circuit for discharge lamp of claim 1, wherein: this rectification unit is a bridge rectifier.

7, according to the described light control matching circuit for discharge lamp of claim 1, wherein: respectively this electric-controlled switch is a transistor.

8, according to the described light control matching circuit for discharge lamp of claim 1, wherein: respectively this oscillating unit is a RL oscillation circuit, is in series by a resistance and an inductance.

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