CN105025645A - Safe starting circuit for electronic ballast of electrodeless lamp - Google Patents
Safe starting circuit for electronic ballast of electrodeless lamp Download PDFInfo
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- CN105025645A CN105025645A CN201410169589.8A CN201410169589A CN105025645A CN 105025645 A CN105025645 A CN 105025645A CN 201410169589 A CN201410169589 A CN 201410169589A CN 105025645 A CN105025645 A CN 105025645A
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- circuit
- amplifier
- electrodeless lamp
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- electronic ballast
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Abstract
The invention provides a safe starting circuit for an electronic ballast of an electrodeless lamp. The safe starting circuit is characterized by comprising a trigger pulse generating circuit, a signal conditioning circuit and a thyristor, wherein an anode and a cathode of the thyristor are respectively connected with an output end and the grounding end of a primary coil of a pulse transformer, the conditioning circuit is connected with a secondary coil of the pulse transformer through a coupler, an output end of the conditioning circuit is connected with a control end of the trigger pulse generating circuit, and an output end of the trigger pulse generating circuit is connected with a gate pole of the thyristor. According to the safe starting circuit, the electrodeless lamp is turned on when the electronic ballast is started, a current flowing through the electrodeless lamp is coupled into a voltage for output after the electrodeless lamp is on, the output voltage is served as a control signal for triggering the on/off of the thyristor so that the electronic ballast does not work, thereby the electronic ballast is blocked and prevented from starting again to damage electrodes of the electrodeless lamp, thereby prolonging the service life of the electrodeless lamp, and ensuring the stability and reliability of long-time operation of the electrodeless lamp.
Description
Technical field
The present invention relates to a kind of safety starter circuit, particularly relate to a kind of safety starter circuit for electronic ballast of electrodeless lamp, belong to electronic applications.
Background technology
Non-polarized lamp forms primarily of three parts, i.e. power circuit, electric ballast and the bulb three part composition scribbling three primary colors fluorescent powder, its operation principle is: first civil power is converted to direct current, be transformed into high-frequency electrical energy again, high-frequency electrical energy produces high-intensity magnetic field by the induction coil (coupler) in bulb centre, magnetic field energy induction enters in bulb, gas avalanche ionization in bulb is made to form plasma, excited atom in plasma gives off the ultraviolet of 254nm in ground state process returning, bulb inner wall light of firefly powder converts visible ray to by Ultraviolet radiation.
The moment that electric ballast starts can produce peak voltage and impact, if electric ballast again starts because of under external cause action after one-shot, the electrode of the peak voltage meeting impact failure Non-polarized lamp produced instantaneously, reduce the useful life of Non-polarized lamp, affect the reliability and stability that Non-polarized lamp works long hours.Therefore, need a kind of electronic ballast starting circuit of improvement to protect the electrode of Non-polarized lamp thus to overcome above-mentioned defect.
Summary of the invention
In order to solve the deficiency in background technology, the object of the invention is to the defect overcoming background technology, a kind of safety starter circuit of electronic ballast of electrodeless lamp is provided, this safety starter circuit can prevent electric ballast from again starting and the electrode of impact failure Non-polarized lamp, thus extend the useful life of Non-polarized lamp, guarantee the stability that Non-polarized lamp works long hours and reliability.
For achieving the above object, the technical solution used in the present invention is: a kind of safety starter circuit of electronic ballast of electrodeless lamp, described electric ballast comprises power factor correction circuit and pulse transformer, the output of described power factor correction circuit is connected with the input of pulse transformer primary coil, it is characterized in that: described safety starter circuit comprises trigger impulse and produces circuit, modulate circuit and a thyristor, the anode of described thyristor is connected with ground with the output of pulse transformer primary coil respectively with negative electrode, described modulate circuit is connected with the secondary coil of described pulse transformer by a coupler, the control end that output and the described trigger impulse of described modulate circuit produce circuit is connected, the output that described trigger impulse produces circuit is connected with the gate pole of described thyristor.
In a preferred embodiment of the present invention, comprise it further and also comprise the accumulator be connected between described power factor correction circuit and pulse transformer primary coil input end, described accumulator comprises the first resistance and the first electric capacity, is connected in series after described first resistance and the first Capacitance parallel connection with the primary coil input of described pulse transformer.
In a preferred embodiment of the present invention, comprise described modulate circuit further and comprise current rectifying and wave filtering circuit, the first amplifier and the second amplifier.
In a preferred embodiment of the present invention, comprise described rectification circuit further and comprise voltage-stabiliser tube, the second resistance, the second electric capacity, be serially connected between the negative electrode of voltage-stabiliser tube and ground after described second resistance and the second Capacitance parallel connection, the anode of described voltage-stabiliser tube is connected with described coupler.
In a preferred embodiment of the present invention, the positive supply pin comprising described first amplifier and the second amplifier further meets+VDD, negative supply pin ground connection, the positive terminal pin of the first amplifier is connected with the output of described rectification circuit by the 3rd resistance, the output of the first amplifier is connected to its end of oppisite phase by feedback resistance (R4, R5), the output of the first amplifier is also connected to the end of oppisite phase of the second amplifier by the 6th resistance, the forward end of the second amplifier meets+VDD by divider resistance (R7, R8).
In a preferred embodiment of the present invention, comprising described trigger impulse generation circuit is further that 555 timer pulses produce circuit, the output of described second amplifier is connected to the 4th pin of 555 timers, and the 3rd pin of described 555 timers is connected with the gate pole of described thyristor.
The safety starter circuit of a kind of electronic ballast of electrodeless lamp of the present invention, after electric ballast starts, Non-polarized lamp is bright, voltage is become to export the current coupling flowing through Non-polarized lamp after lamp is bright, this output voltage is as the control signal triggering thyristor break-make, electric ballast is not worked, blocks electric ballast with this, prevent it from again starting and damage the electrode of Non-polarized lamp, thus extend the useful life of Non-polarized lamp, guarantee the stability that Non-polarized lamp works long hours and reliability.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the circuit diagram of the preferred embodiment of the present invention.
In figure: 10, trigger impulse produces circuit, 20, modulate circuit, 30, accumulator, 40, current rectifying and wave filtering circuit.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and enable above-mentioned purpose of the present invention, feature and advantage become apparent more, below in conjunction with embodiment and embodiment accompanying drawing, the present invention is further detailed explanation.
Electric ballast of the present invention comprises power factor correction circuit APFC and pulse transformer T1, and the output of power factor correction circuit APFC is connected with the input of pulse transformer T1 primary coil.Power factor correction circuit APFC(Active Power Factor Correction, passive power factor corrective circuit), realize high power factor value, low harmony wave, reduce product to the interference of civil power, with the requirement making product meet relevant harmonic standard.The hardware module of current power factor correction circuit APFC is very ripe; its structure composed is not the technology point that the present invention protects; be not repeated at this, demand power factor correction circuit APFC of the present invention exports the stable DC voltage of 400VDC/300W, and quality factor are higher than 0.96.
As shown in Figure 1, the safety starter circuit of a kind of electronic ballast of electrodeless lamp provided by the invention, comprises trigger impulse and produces circuit 10, modulate circuit 20 and a thyristor Q, accumulator 30.
The anode of thyristor Q is connected with ground with the output of pulse transformer T1 primary coil respectively with negative electrode, modulate circuit 20 is connected with the secondary coil of pulse transformer T1 by a coupler T2, the control end that output and the trigger impulse of modulate circuit 20 produce circuit 10 is connected, trigger impulse produces the output of circuit 10 and is connected with the gate pole G of thyristor Q, and accumulator 30 is connected between power factor correction circuit APFC and pulse transformer T1 primary coil input.
Wherein, accumulator 30 comprises the first resistance R1 and the first electric capacity C1, is connected in series after the first resistance R1 and the first electric capacity C1 parallel connection with the primary coil input of pulse transformer T1.
Modulate circuit 20 comprises current rectifying and wave filtering circuit 40, first amplifier U1A and the second amplifier U1B.
And rectification circuit 40 comprises voltage-stabiliser tube D, the second resistance R2, the second electric capacity C2, between the negative electrode being serially connected in voltage-stabiliser tube D after the second resistance R2 and the second electric capacity C2 parallel connection and ground, the anode of voltage-stabiliser tube D is connected with coupler T2.
The positive supply pin of the first amplifier U1A and the second amplifier U1B meets+VDD, negative supply pin ground connection, the positive terminal pin of the first amplifier U1A is connected with the output of rectification circuit 40 by the 3rd resistance R3, the output of the first amplifier U1A is connected to its end of oppisite phase by feedback resistance R4, R5, the output of the first amplifier U1A is also connected to the end of oppisite phase of the second amplifier U1B by the 6th resistance R6, the forward end of the second amplifier U1B meets+VDD by divider resistance R7, R8.
During the present invention preferably implements, trigger impulse produces circuit 10 is that 555 timer pulses produce circuit, and the 3rd pin 3 that the output of the second amplifier U1B is connected to the 4th pin 4,555 timer of 555 timers is connected with the gate pole G of thyristor Q.
The operation principle of safety starter circuit of the present invention is: after power factor correction circuit APFC works, DC bus obtains 400V direct voltage, the DC power supply of 400V is charged to the first electric capacity C1 through the first resistance R1, 555 timers normally work simultaneously, send impulse waveform, after pulse is applied to thyristor Q gate pole G, make the reliable conducting of thyristor Q, first electric capacity C1 is to the electric energy of the primary coil release storage of pulse transformer T1, pulse transformer T1 primary voltage rises rapidly, boost through T1, its secondary coil obtains the voltage of several kilovolts, light Non-polarized lamp HPS, certain voltage will be produced in secondary coupling when Non-polarized lamp HPS lights when after-current flows through coupler T2 former limit, current rectifying and wave filtering circuit 40 is to exporting a high level through the first amplifier U1A again after this voltage commutation and inputting the negative phase end of the second amplifier U1B, in the output output low level of the second amplifier U1B relatively, low level feeds back to the 4th pin of 555 timers, 555 timers are not worked, export with the pulse that this blocks 555 timers, cutoff thyristor Q, electric ballast is quit work, as long as namely Non-polarized lamp of the present invention is bright, 555 timers will export by locking pulse, electric ballast would not be worked, prevent electric ballast because again starting and the electrode of impact injury Non-polarized lamp with this, extend the useful life of Non-polarized lamp, guarantee stability and the reliability of Non-polarized lamp Long-Time Service.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; the change done under other any does not deviate from Spirit Essence of the present invention and principle, modification, substitute, combine, simplify the substitute mode that all should be equivalence, be included within protection scope of the present invention.Therefore, the protection range that protection scope of the present invention should define with claim is as the criterion.
Claims (6)
1. the safety starter circuit of an electronic ballast of electrodeless lamp, described electric ballast comprises power factor correction circuit and pulse transformer, the output of described power factor correction circuit is connected with the input of pulse transformer primary coil, it is characterized in that: described safety starter circuit comprises trigger impulse and produces circuit, modulate circuit and a thyristor, the anode of described thyristor is connected with ground with the output of pulse transformer primary coil respectively with negative electrode, described modulate circuit is connected with the secondary coil of described pulse transformer by a coupler, the control end that output and the described trigger impulse of described modulate circuit produce circuit is connected, the output that described trigger impulse produces circuit is connected with the gate pole of described thyristor.
2. the safety starter circuit of a kind of electronic ballast of electrodeless lamp according to claim 1, it is characterized in that: it also comprises the accumulator be connected between described power factor correction circuit and pulse transformer primary coil input end, described accumulator comprises the first resistance and the first electric capacity, is connected in series after described first resistance and the first Capacitance parallel connection with the primary coil input of described pulse transformer.
3. the safety starter circuit of a kind of electronic ballast of electrodeless lamp according to claim 1, is characterized in that: described modulate circuit comprises current rectifying and wave filtering circuit, the first amplifier and the second amplifier.
4. the safety starter circuit of a kind of electronic ballast of electrodeless lamp according to claim 3, it is characterized in that: described rectification circuit comprises voltage-stabiliser tube, the second resistance, the second electric capacity, be serially connected between the negative electrode of voltage-stabiliser tube and ground after described second resistance and the second Capacitance parallel connection, the anode of described voltage-stabiliser tube is connected with described coupler.
5. the safety starter circuit of a kind of electronic ballast of electrodeless lamp according to claim 3, it is characterized in that: the positive supply pin of described first amplifier and the second amplifier meets+VDD, negative supply pin ground connection, the positive terminal pin of the first amplifier is connected with the output of described rectification circuit by the 3rd resistance, the output of the first amplifier is by feedback resistance (R4, R5) its end of oppisite phase is connected to, the output of the first amplifier is also connected to the end of oppisite phase of the second amplifier by the 6th resistance, the forward end of the second amplifier is by divider resistance (R7, R8)+VDD is met.
6. the safety starter circuit of a kind of electronic ballast of electrodeless lamp according to claim 5, it is characterized in that: it is that 555 timer pulses produce circuit that described trigger impulse produces circuit, the output of described second amplifier is connected to the 4th pin of 555 timers, and the 3rd pin of described 555 timers is connected with the gate pole of described thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169589.8A CN105025645A (en) | 2014-04-25 | 2014-04-25 | Safe starting circuit for electronic ballast of electrodeless lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169589.8A CN105025645A (en) | 2014-04-25 | 2014-04-25 | Safe starting circuit for electronic ballast of electrodeless lamp |
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| Publication Number | Publication Date |
|---|---|
| CN105025645A true CN105025645A (en) | 2015-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410169589.8A Pending CN105025645A (en) | 2014-04-25 | 2014-04-25 | Safe starting circuit for electronic ballast of electrodeless lamp |
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| CN (1) | CN105025645A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704859A (en) * | 2016-03-15 | 2016-06-22 | 山东那时花开文化传媒有限公司 | Lighting project intelligent control system |
-
2014
- 2014-04-25 CN CN201410169589.8A patent/CN105025645A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704859A (en) * | 2016-03-15 | 2016-06-22 | 山东那时花开文化传媒有限公司 | Lighting project intelligent control system |
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Application publication date: 20151104 |
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| WD01 | Invention patent application deemed withdrawn after publication |