CN1118980A

CN1118980A - Circuitry for preheating a gasdischarge lamp

Info

Publication number: CN1118980A
Application number: CN94118428A
Authority: CN
Inventors: 丹尼尔·慕斯里
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-18
Filing date: 1994-12-16
Publication date: 1996-03-20
Also published as: JPH0896979A; EP0697803A3; EP0697803A2; EP0697803B1; ES2146685T3; ATE190185T1; DE59507872D1; KR960009805A; KR100396386B1

Abstract

The invention provides a circuit configuration for controlling a glow lamp. A series current limiting circuit with an inductance (DR3,I4) and a capacitor (C8) is inserted in the current circuit between one terminal of the discharge lamp (FL) and the coupling line VL of the rectifier bridges (D1, D2, D3, D4). The invention is capable of holding reactive current substantially zero and the peak voltage lower on the power source side.

Description

The circuit structure that is used for the control gaseous discharge lamp

The present invention relates to a kind of circuit structure that is used for the control gaseous discharge lamp, the sort circuit structure has an input unit between the positive pole of the rectifier circuit that the alternating current network with phase line and zero line is carried out rectification and negative pole, this input unit has a filter, after connect an oscillating circuit and a high frequency oscillation circuit, and a decoupling capacitance and a tertiary coil, this tertiary coil with the coil of aforementioned two high frequency oscillation circuits on a common iron core, constituted a current transformer, and this constant-current stabilizer has been connected the connecting circuit between two triodes and the electrode for discharge lamp circuit.

For a long time, it is known to be used for the input unit of fluorescent lamp.The supply voltage that this device adopts is 110 volts or 220-250 volts, and ignitor supply is brought up on the quite high level, to the order of magnitude that is approximately 1000 volts.Same well-knownly be, can with common supply frequency from 50 or 60Hz bring up to 30 to 40KHz.The benefit of this method is to light discharge lamp immediately.The supplier of electricity requirement, high order harmonic component should not fall in the radio-frequency region on the one hand, because if the frequency of discharge lamp bias voltage is 50KHz, its triple-frequency harmonics is 150KHz.Therefore, must make frequency＜50KHz, but, require frequency＞25KHz again for concrete utilization.On the other hand, because measurement and clearing are all difficult, so reactive current also can become a bigger problem.

Another problem produces because of high frequency peaks voltage, because this crest voltage can be superimposed upon on the crest of the line voltage wave of oscillation.If according to DE-A-3611611, in feed line, connect a reactor, then just can address this problem.But doing so also has shortcoming, and when mains frequency was 50-60Hz, such reactor must be done quite greatly, thereby went in the lamp socket of the electricity-saving lamp of can not packing into.In order to reduce high order harmonic component, suggestion is adopted one by a reactor and the series circuit that diode is formed among the DE-A-3222534, and there are two capacitors at the tie point place between reactor and the diode.Such configuration really can reduce high order harmonic component.But these elements have formed a high frequency voltage divider, and this can increase the weight of transistorized load greatly.This additional reactor is the part of high frequency oscillation circuit, gets rid of the effect of disturbing thereby just partly play, and like this, this high-frequency harmonic still is higher than permissible value, in addition, adopts this method can not reduce the reactive current part.

Corresponding therewith, a task of the present invention is to set up a circuit structure, and this circuit structure makes reactive current partly be approximately zero, and in fact the voltage peak of mains side is inhibited.

For reaching this point, in the circuit between connecting line and discharge lamp socket, be used for limit electric current by one by an inductance and the series connection oscillation circuit that electric capacity is formed at the rectifier place, its purpose is to set up the turning circuit of the high frequency feed current potential of discharge lamp to diode in the rectifier.

Below by means of the description of drawings embodiments of the invention.

Fig. 1 is the integrated circuit figure that applies to electricity-saving lamp, contains the feedback from lamp one side direction rectifier power supply one side in the circuit,

Fig. 2 is identical with Fig. 1, and the oscillation circuit of just connecting is different, and this structure is used to have the various intensity discharge lamps with preceding identical flow restricter,

The circuit structure that Fig. 3 describes is identical with Fig. 1, and different is that discharge lamp is connected in the series connection oscillation circuit, follows second electrode of DC side to link together,

The circuit structure that Fig. 4 describes is identical with Fig. 1, and different is that second electrode and AC side are connected, and has the circuit structure on a mensuration rectifier rising edge edge,

The circuit structure that Fig. 5 describes is identical with Fig. 1, this circuit is used for supply power voltage when being 110V situation that different is.

In circuit structure shown in Figure 1, the AC supply voltage that is used for a certain supply network is 220V, and 50 to 60Hz, and its contact is represented phase line with P, represents zero line with O.Safeties Si protection electronic circuit is avoided the influence of big electric current.Diode D1, D2, D3 and D4 constitute a well-known bridge rectifier, and have reactor DR1, current compensation filter inductance DR2 and building-out capacitor C1, C2, C3.Electrolytic condenser C5 is as smmothing capacitor.

The circuit that is used to control discharge lamp FL mainly is made of the frequency generator of recommending that has two transistor Ts 1 and T2 and flyback diode D5 and D6, and said elements is stablized the frequency of high frequency oscillation circuit with resistance R 6 and capacitor C 7.Here, capacitor exerts an influence to the rising characteristic of transistor T 1 and T2.This two-transistor also is equipped with input resistance R2 and R4 and emitter resistance R3 and R4 when using.Coupling capacitance C4 is used for measuring the rising edge edge of the rectifier of being made up of diode D1, D2, D3 and D4.Start-oscillation circuit is made up of one first resistance R 1 and capacitor C4, diode D7 and a diac (Diac), it act as: with after O links to each other, just make the high frequency oscillation circuit of being made up of first coil I1 on the base resistance R2 and the second coil I2 on the base resistance R4 be in oscillatory regime power supply AC and terminals P.Two coil I1 and I2 are on same annular core.

The electrode E1 of electricity-saving lamp FL links to each other with tie point between two transistor Ts 1 and the T2 by line VL, also is connected with reactor DR3, tertiary coil I3 and capacitor C8 on the line VL.Another electrode E2 links to each other with the zero line O of AC power AC.Series resonant tank is made up of resonant inductance, coupling capacitance C6 and the resonance capacitor C 7 of reactor DR2.Here, the above-mentioned tie point between resonant inductance DR2, coupling capacitance C6, transistor T 1, the T2, the electrode E1 of lamp FL and resonant capacitance C7 are connected in the heating circuit of lamp FL.The working method of recommending frequency generator is not specifically noted here with the series resonant tank that is used for discharge lamp, because on the one hand each those skilled in the art are afamiliar with its operation principle, " electronic circuit " the 148th page write of W.Hirschmann (Siemens Co., Ltd) has detailed description on the other hand.

Be connected across diode D8 and D9 in addition on the high frequency oscillation circuit that has transistor T 1, T2 and flyback retrace diode D5, D6, the tie point of diode D8 and D9 links to each other with the capacitor C 12 of the last cross-over connection of E2, the tie point of C13 with electrode for discharge lamp E1 by thermistor PTC.This circuit structure plays pre-heat effect to discharge lamp.

Connect after the rectifier, resistance PTC is in the state of cooling usually, from but low ohm state.In order to avoid the voltage between electrode E1, E2 to produce glow discharge in discharge lamp under the connection state like this, the capacitance of capacitor must be higher relatively, is about 6nF usually.In this state, there is the electric current of about 100mA to flow through in the output loop of input unit, thereby the helix of electrode E1, E2 and resistance PTC were heated to about 900 ℃ very soon at several seconds in the kind, this makes resistance PTC be in high ohmic state, voltage on electrode E1, the E2 rises to 1000V, thereby light discharge lamp, and do not have the glow discharge phenomenon to occur.Discharge lamp is about 100V at the voltage of lighting under the state.When discharge lamp was lighted, the continuous current that consumes on the resistance was no more than 0.5W, and successively cut off the feed of preheat circuit and discharge lamp, thereby obtained the feed current of discharge lamp from tie point H.Ignition procedures as mentioned above, yet because the existence of diode D8, D9 just no longer includes current flowing resistance PTC after discharge lamp is lighted, resistance is cooled off again.This has just been avoided the unnecessary current drain by resistance PTC.

If insert a series circuit of being made up of inductance I3 and capacitor C8 between the tie point H of connecting line VL and electrode E1, then this circuit structure also has further application.By the second electrode E2 being fed back to the interchange end of rectification circuit, promptly make electric current obtain restriction to the feedback of rectifier D1, D2, D3, D4 AC side as shown in Figure 1, and make and produce the turning circuit that a current potential is added to diode D1, D2, D3, D4 in the rectifier in the high frequency feed circuit of discharge lamp (FL) and get on.The peak value that just occurs alternating current pure oscillation high frequency voltage does not subsequently have the voltage peak alternating voltage that is added to and gets on.

This clearly illustrates that the present invention has obtained a substantial improvement in the application of discharge lamp.Compare with known circuit structure, circuit element does not have substantial increase, because inductance I3 is and coil I1 and I2 another coil on the same annular core, thereby only needs to increase in addition a capacitor C 8.

Increase some cost again, according to Fig. 2, each common electricity-saving lamp can comprise an electronics lamp socket when using.As can be seen, reactor DR3 has four taps, and the inductance I3 in the series circuit is divided into four grouping winding I4a, I4b, I4c and I4d.Thereby clearly, four capacitor C 8a, C8b, C8c and C8d must be arranged.

Another variant form as shown in Figure 3.Its inventive point is reactor DR3 is connected the starting point of series circuit, reactor DR3 no longer is connected line VL, also is in the loop of electrode E1, but be connected in the loop of electrode E2, that is to say the positive pole of the current path that is connected rectifier D1, D2, D3, D4.Reactor DR3 constitutes the direct current supply to radio-frequency generator with another reactor DR4.Electrode E2 is connected the tie point place of two reactor DR3, DR4.Its operation principle is identical with previous embodiment basically, the different just chargings of diode carry out in the DC side of rectifier.

Another kind of variant form as shown in Figure 4.Here added one the 4th reactor DR4 again in output place shown in Figure 1.This reactor DR4 is connected on the tap points and the AC mains between the coupling capacitance C4 of building-out capacitor C3.Like this, with practically identical expense, available power will be brought up to more than 0.95 with the ratio of apparent power, will be reduced to below 10% the reactive harmonic wave of AC network.In the laboratory research, can record power factor (PF) and be higher than more than 99.5.

For the purpose of improving, Fig. 5 has described and the essentially identical circuit structure of aforementioned circuit structure, different is, here, the whole wave circuit of the all-wave that four diodes of former cause are formed is by a voltage doubling rectifing circuit replacement of being made up of diode D10 and D11 and the capacitor C 2 that is attached thereto and C3.The smothing filtering of direct current is realized that by electrochemical capacitor C4 and C5 each in these two electric capacity links to each other with the phase line P of output of the direct current of diode D10 and D11 and power supply AC.Certainly, electrode E2 is connected alternating current one side.Its operation principle is identical with the previous embodiment circuit structure, and simultaneously, high frequency voltage also can only reach the instantaneous amplitude value of alternating voltage, thereby does not have or have only very a spot of distortion in the harmonic oscillation.

Claims

1. the circuit structure of a control gaseous discharge lamp, it comprises the rectification circuit (D1 that the AC power with phase line (P) and zero line (O) is carried out rectification, D2, D3, D4) input unit between the both positive and negative polarity, described input unit contains a filtering stage (C1, C2, C3, DR1, DR2), one start-oscillation circuit (the R1 that links to each other with described filtering stage, C6, D5, DI-AC) and a high frequency oscillation circuit (R2-R6, T1, T2, D5, D6, C6, I1, I2), also has a decoupling capacitance (C7), the 3rd reactor (DR3), above-mentioned two inductance (I3 of they and high frequency oscillation circuit, I4) together on same iron core, constitute a current transformer; Described input unit is at two triode (T1, T2) tie point between (H) gets on by the electrode (E1) that connection lead (VL) is communicated to discharge lamp (FL), second electrode (E2) of described discharge lamp (FL) is by resonant capacitance (C12, C13) link to each other with first electrode (E1), it is characterized in that, in the circuit between the socket of line (VL) and discharge lamp (FL), at rectifier (D1, D2, D3, D4) located one by inductance (DR3, I4) and the series loop formed of electric capacity (C8), be used for suppressing electric current, and in rectifier diode (D1, D2, D3, D4) set up the high frequency feed current potential of discharge lamp (FL) in the turning circuit.

2. circuit structure as claimed in claim 1 is characterized in that, (DR3, I4 C8) are connected between the electrode (E1) of tie point H and discharge lamp (FL) described series connection oscillation circuit.

3. circuit structure as claimed in claim 1 is characterized in that, described discharge lamp (FL) passes through inductance (I4 with its electrode (E1) on the one hand, DR2) link to each other with tie point (H) with electric capacity (C6), and discharge lamp (FL) is connected to the series connection oscillation circuit, and (DR3, I4 go in C8).

4. circuit structure as claimed in claim 3, it is characterized in that, series connection oscillation circuit (DR3, I4, C8) direct and power supply terminal (P, O) in one links to each other, and in that (P O) has connected an additional reactor (D4) between continuous second electrode (E2) and the rectifier (D1, D2, D3, D4) with current terminal.

5. circuit structure as claimed in claim 3 is characterized in that, described series connection oscillation circuit (DR3, I4, C8) directly with current terminal (P, O) in one link to each other, and described second electrode (E2) and current terminal (P, O) directly continuous.

6. circuit structure as claimed in claim 3, it is characterized in that, described series connection oscillation circuit (D3, I4, C8) inserts DC current path behind the rectifier (D1, D2, D3, D4) from second electrode (E2) of discharge lamp, thereby be connected in series another reactor (DR4) with inductance (DR3), and capacitor (C8) is connected across between inductance (I4) and the reactor (DR3).

7. circuit structure as claimed in claim 2, it is characterized in that, inductance of described series connection oscillation circuit (I4) and electric capacity (C8) constitute with the form (I4a, I4b, I4c, I4d, C8a, C8b, C9c, C8d) of branch in parallel, and make the circuit of first electrode (E1) of discharge tube (FL) connect a wherein a certain branch selectively corresponding to discharge tube (FL) luminous power.

8. as any one described circuit structure in the claim 1 to 7, it is characterized in that the tie point between two capacitors (C12, C13) that the intermediate point of the preheat circuit that links to each other in parallel of the diode (D5, D6) in two diodes (D8, D9) and the high frequency oscillation circuit gets up by thermistor PTC with two electrodes (E1, E2) bridge joint of discharge tube (FL) is connected.