CN2258335Y - Electronic ballast for high-intensity gas-discharge lamp - Google Patents
Electronic ballast for high-intensity gas-discharge lamp Download PDFInfo
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- CN2258335Y CN2258335Y CN 96207781 CN96207781U CN2258335Y CN 2258335 Y CN2258335 Y CN 2258335Y CN 96207781 CN96207781 CN 96207781 CN 96207781 U CN96207781 U CN 96207781U CN 2258335 Y CN2258335 Y CN 2258335Y
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Abstract
The utility model relates to an electronic ballast for a high intensity gas discharge lamp, which is composed of a main circuit of a gas discharge lamp and a control circuit of the gas discharge lamp. The main circuit comprises a low pass filtering rectification circuit, a power factor correction circuit in a pulse frequency control type, a semi-bridge type power output circuit, a resonance starting ballast circuit, and a secondary pullout circuit of a power tube. The control circuit comprises a square wave generator, a triangular wave shaping circuit, a PWM control circuit, a shaping drive circuit, a glow starting failure of oscillation control circuit, and a current fold back circuit. 28KHz to 100KHz frequency sweeping resonance start and 28KHz master frequency ballasting can be realized to the main circuit by the control circuit. The utility model has the advantages of high power factor and long service life.
Description
The utility model relates to a kind of electric lighting device, relates to the electric ballast that high-intensity gas discharge lamp is used or rather.
High intensity discharge (HID) lamp comprises halide lamp, mercury lamp, sodium vapor lamp etc., compare with incandescent lamp, fluorescent lamp, iodine-tungsten lamp, characteristics such as energy-conservation, that volume is little, luminous efficiency is high, spectrum is good, the life-span is long are arranged, therefore become the preferred light source of shop, highway, square, stadiums even family gradually.Also become the problem that each light source production unit is studied with the electric ballast of the matching used high frequencyization of HID lamp, electronization, miniaturization.
At present, abroad some developed countries have developed the small-sized all-electronic HID electronic lamp ballast of lighting with the 20-50KHZ high frequency square wave, but have only the product of middle low power such as 75W to come out, and cost an arm and a leg.Domestic also prolonging substantially at present used big and the low frequency inductance ballast of heaviness and power factor.
The key technology of HID lamp electronic ballast roughly comprises three aspects, the one, the essential power factor problem that solves, and must be in the inner realization of electric ballast voltage stabilizing, the problem that when the voltage fluctuation of electric power system, just luminous shakiness can not take place even extinguish like this, and concentrate the problem that also can not occur interfering with each other when lighting when a plurality of electric ballasts; The 2nd, essential self life problems that solves ballast, this also is the key that can product practical, the principal element that influences the electric ballast life-span is the HF switch loss of power output tube, be because of its be operated under the high-frequency current more than the 20KHZ pipe temperature rise too high due to; The 3rd, the damage problem of power tube, because starter is lighted the high-voltage pulse that the HID lamp needs 4KV, the high-voltage pulse that adds can add to very easily breakdown power pipe of power tube two ends by circuit loop.In order to solve the problem of above-mentioned three aspects, many products have to increase suitable complex circuit design, but effect is unsatisfactory, and the complicated cost of antimetrical circuit rises, and more is unfavorable for the practicability of product.
The purpose of this utility model is to design a kind of HID electronic lamp ballast at the problem of above-mentioned three aspects, make have the power factor height, circuit structure is simple, cost is low, the life-span is long characteristics.
Electronic ballast for high-strength gas discharge lamp of the present utility model comprises the gaseous discharge lamp major loop that is connected and composed by low-pass filtering rectification circuit, semibridge system power output circuit and resonance build-up of luminance ballasting circuit, it is characterized in that:
Also include pulse frequency control type circuit of power factor correction and secondary hand off circuit in the described gaseous discharge lamp major loop, pulse frequency control type circuit of power factor correction is connected between described low-pass filtering rectification circuit and the described semibridge system power output circuit, before the secondary hand off circuit is arranged at the power output pipe input stage of semibridge system power output circuit;
Also comprise the frequency sweep resonance build-up of luminance of a major loop that connects and composes by square-wave generator, triangular wave shaping circuit, control circuit for pulse-width modulation, plastic drive circuit and build-up of luminance failure of oscillation control circuit, the control circuit of dominant frequency ballast; Starter failure of oscillation control circuit, square-wave generator, triangular wave shaping circuit, control circuit for pulse-width modulation and plastic drive circuit are linked in sequence, plastic drive circuit output connects described secondary hand off circuit, and the control end of described build-up of luminance failure of oscillation control circuit connects described semibridge system power output circuit.
The frequency sweep resonance build-up of luminance of described major loop, the control circuit of dominant frequency ballast also comprise an output overcurrent protective circuit that is made of voltage comparator; the input of output overcurrent protective circuit connects described semibridge system power output circuit, and the output of output overcurrent protective circuit connects described control circuit for pulse-width modulation.
Described pulse frequency control type circuit of power factor correction comprises pulse frequency control type Zero Current Switch voltage stabilizing circuit that is connected and composed by pulse frequency control integrated chip and field effect transistor and the single-ended reverse exciting boost type circuit that is connected and composed by inductance, diode, electric capacity.
Described secondary hand off circuit is the quick leadage circuit of electric charge of the power output pipe that connected and composed by transistor, diode, resistance.
Described square-wave generator is the inverting integrator that is connected and composed by operational amplifier, resistance, electric capacity, described triangular wave shaping circuit is the emitter follower that is connected and composed by operational amplifier, resistance, electric capacity, and described starter failure of oscillation circuit is the voltage comparator that is connected and composed by operational amplifier, resistance.
The described square-wave generator that is linked in sequence, triangular wave shaping circuit and control circuit for pulse-width modulation are the frequency sweep circuits of the continuous square wave of output 28KHZ-100KHZ.
Embodiment and accompanying drawing below in conjunction with an all-electronic HID lamp electronic ballast of lighting with the 28KHZ high frequency further specify technology of the present utility model.
Fig. 1. the electronic ballast for high-strength gas discharge lamp theory diagram
Fig. 2. gaseous discharge lamp major loop electrical schematic diagram among Fig. 1
Fig. 3. gas discharge lamp control circuit electrical schematic diagram among Fig. 1
Referring to Fig. 1, connect and compose the major loop of gaseous discharge lamp 20 by low-pass filtering rectification circuit 101, pulse frequency control (P.F.C) formula circuit of power factor correction 102, semibridge system power output circuit 103, resonance starter ballast circuit 104 and secondary hand off circuit 109.Connect and compose the control circuit of power factor correction, discharge lamp build-up of luminance and power output by square-wave generator 105, triangular wave shaping circuit 106, pulse-width modulation (PWM) control circuit 107, plastic drive circuit 108, build-up of luminance failure of oscillation control circuit 110 and output overcurrent protective circuit 111.
P.F.C circuit of power factor correction 102 output galvanic currents are pressed and are added to semibridge system power output circuit 103, the acting in conjunction of square-wave generator 105, triangular wave shaping circuit 106 and pwm control circuit 107 can realize that the frequency sweep of plastic drive circuit 108 changes during start, export the square wave that a succession of 28KHZ-100KHZ changes back and forth, make resonance starter ballast circuit 104 become frequency sweep resonant mode starter.In a single day lighted discharge lamp 20 by the resonance high-voltage that frequency sweep produces; then close frequency sweep by starter failure of oscillation control circuit 110; 108 recoveries of plastic drive circuit ballast on the dominant frequency of 28KHZ of this moment; and when output short-circuit or overcurrent, the output of The whole control circuit is closed in 111 controls of output overcurrent protective circuit.The effect of secondary hand off circuit is that the back edge of output square wave is reduced, and helps improving the life-span of power output tube, and the continuous square wave of one group of phase phasic difference of plastic drive circuit 108 outputs, 180 degree is used to drive semibridge system power output circuit 103.
Referring to Fig. 2, L1, D1-14, L2, C2 etc. connect to form the low-pass filtering rectification circuit, insert the P.F.C circuit of power factor correction of being made up of parallel switching power supply that is connected and composed by pulse frequency control sets IC1 in blocks (UC3852), Q3, L3, D11, C8, C9 etc.Wherein IC1, Q3 adopt PFC formula Zero Current Switch technology, and L3, D11, C8, C9 have formed single-ended reverse exciting boost type voltage stabilizing circuit (LDC), through the dividing potential drop closed loop of R13, R14, R15 and R16, make output voltage stabilization on direct current 80V.When the embodiment circuit changed in the scope of input 220V voltage from+15% to-20%, output changed 10%, can guarantee the job stability of ballast and improve power factor.Integrated of IC1 itself has window power supply circuits, can minimum current start (the VCC end is 7 pin), after the circuit operate as normal, the power supply of IC1 is then provided behind D9, D10, C10 full-wave rectifier filter by the secondary winding of main transformer B1.6 pin of IC1 provide drive signal to Q3.Adopt LDC formula circuit can reduce volume, its stored energy and the power supply energy stack back output of energy storage inductor L3 significantly.
Form the semibridge system power output circuit by Q1, Q2, B1, L4, driving power pipe Q1, Q2's is the continuous square wave of 28KHZ (28KHZ be international standard the sound of HID lamp can be shaken drop to minimum) of the one group of phase phasic difference that is provided by control circuit 180 degree.B1 is the buck autotransformer, with the square-wave voltage reduction of Q1, Q2 output, receives on the HID lamp 20 by the ballast effect of L4 again.
T1, T2 and peripheral cell thereof constitute the secondary hand off circuit, the square wave back edge of control circuit output are reduced about 1 μ S, to reduce the switching loss of power tube.Pulsed drive transformer B2 exports the square wave of one group of phase phasic difference, 180 degree, because Q1, Q2 adopt the VMOS pipe, its grid capacitance can make the forward position exponentially curve of drive waveforms, edge, back become logarithmic curve, cause Q1, Q2 to enter the linear amplification district, also can cause the common conducting of Q1, Q2 when serious, so that burn power tube, the purpose that the secondary hand off circuit is set is in order to address the above problem.For example secondary hand off circuit T1, D12, R20, the R22 of Q1, when the positive drive signal of input, positive pulse is delivered to the Q1 grid by D12, R20 and is made its conducting, and D12 is by positively biased both end voltage 0.7V, and T1 ends.Positive pulse signal changes into negative pulse later rapidly, and D12 instead is blocked partially, and negative voltage signal send the T1 base stage to make the T1 conducting by current-limiting resistance R22, and charge stored is turn-offed Q1 rapidly on the Q1 grid of releasing fast.Circuit is seen Fig. 3 in the figure center 30.
Referring to Fig. 3, the 1-5 end is connected with the end of the same name of Fig. 2 among the figure.
Integrated IC3 of pulse-width modulation (CA3524 or TL494), T3, T4, Q3, Q4, B2 (Fig. 2) etc. form pwm control circuit and plastic drive circuit.IC4-1 to IC4-4 (four high guaily unit LM324) and peripheral cell thereof are formed frequency sweep circuit, make the resonance starting circuit become frequency sweep resonant mode starting circuit and control the dominant frequency ballast.Wherein IC4-4 is connected into inverting integrator formation square-wave generator, and the output cycle is 0.5 second a ultralow frequency square wave.IC4-3 is connected into emitter follower and constitutes the triangular wave shaping circuit, the ultralow frequency square wave is integrated into triangular wave, 6 pin (RT) of control IC 3 make IC3 output (11,14 pin) a succession of square wave that is changed back and forth by 28KHZ-100KHZ, realize that the frequency sweep of plastic drive circuit changes.IC4-2 is connected into voltage comparator and constitutes build-up of luminance failure of oscillation control circuit, when in a single day the resonance high-voltage that frequency sweep produces has lighted discharge lamp, main circuit current causes pressure drop (i.e. 1.5 terminal voltages) on Fig. 2 resistance R 19, low level appears in the anode of IC4-2, and it is output as low level, control IC 4-4 square-wave generator quits work and cuts out frequency sweep, and plastic drive circuit will recover the dominant frequency output of 28KHZ.IC4-1 is connected into voltage comparator and constitutes the output overcurrent protective circuit; when output short-circuit or when overcurrent occurring; 5 terminal voltages raise, and the negative terminal of IC4-1 is that its output of high level high level occurs and closes the output that IC3 (10 pin) promptly closes the The whole control circuit and realize overcurrent protection.
In conjunction with referring to Fig. 2, Fig. 3, when connecting ballast power, direct current behind bridge rectifier charges to C7 by R12, when C7 goes up voltage and reaches threshold values just with output voltage stabilization on the 380V direct current, step-down by semibridge system power output circuit and B1, obtaining one group of peak-to-peak value at output is the square wave that 380V is changed back and forth by 28KHZ-100KHZ, this square wave acts on by L4, C12, on the series resonant circuit that the natural capacity of C13 and discharge tube is formed, resonance point can not produce high pressure on the 4-5 subharmonic when master oscillator frequenc is 28KHZ, when frequency sweep point during up to 100KHZ resonance produce unimodal, in the Q of L4 value greater than the high pressure that can produce 4000V at 20 o'clock, because very easy the accomplishing greater than 20 of Q value of L4, thereby circuit provides reliable starting voltage can for the HID lamp.In a single day this voltage light discharge lamp, and loop current control IC 4-2 makes and closes frequency sweep, and control circuit output dominant frequency returns to the 28KHZ dominant frequency from 100KHZ.Owing to be to change to low frequency from high frequency, not only effectively controlled the impulse current when lamp starts, also can make lamp current increase the useful life that prolongs lamp lentamente.
Because the natural capacity of L4, C12, C13 and discharge lamp all exists discreteness can cause the acquisition of high resonance potential of resonance point bias effect, but owing to adopt frequency sweep circuit, in its frequency sweep operation, can find the optimum resonance point, thereby provide convenience to batch process, and the capacity of C12, C13 can reduce greatly, not only reduces cost also to have reduced the meritorious and reactive loss of electric capacity.
The supply power voltage of IC4 can be from the 16 pin (V of IC3 among Fig. 3
REF) on get, mid-point voltage is obtained by the dividing potential drop of R24, R25, not only economy but also circuit are reliable and stable.The output of square-wave generator IC4-4 adds to its in-phase input end by 1/2 ratio-voltage, and add to its inverting input by the capacitance-resistance integration, just exportable peak-to-peak value is 4.5V, cycle to be 0.5 second square wave, add to the in-phase input end of emitter follower IC4-3 again through the capacitance-resistance integration, the triangular wave of IC4-3 output adds to 6 pin of IC3, be equivalent to add a variable resistor, IC3 output is changed by 28KHZ to 100KHZ back and forth by the frequency sweep frequency.Swept-frequency signal drives and the B1 step-down through power tube Q1, Q2, and the resonance of L4, C12, C13 etc. is added on the discharge lamp.Frequency sweep stops behind the lamp starter, and IC4-3 output is put high potential and added to 6 pin of IC3 to change the dominant frequency output services state of IC3.
The utility model adopts simple but novel circuit, only use the integrated chip of routine and the tripartite surface technology difficult problem that general components and parts have solved electronic ballast of high intensity gas discharge lamp, the embodiment sample is through news from Beijing light source detection center and the test of Shanghai electric light source inspection center, power factor can reach 0.998, all other indexs are also all above inductance type ballast, be used with the metal halide lamp of 250W, 400W and received promising result, when supply power voltage changes between 180V-250V, but the discharge lamp steady operation, no blow-out phenomenon.In addition, owing to adopt general-purpose chip and components and parts, simplification and optimization circuit design also to reduce cost, be suitable for producing in batches.
Claims (6)
1. an electronic ballast for high-strength gas discharge lamp comprises the gaseous discharge lamp major loop that is connected and composed by low-pass filtering rectification circuit, semibridge system power output circuit and resonance build-up of luminance ballasting circuit, it is characterized in that:
Also include pulse frequency control type circuit of power factor correction and secondary hand off circuit in the described gaseous discharge lamp major loop, pulse frequency control type circuit of power factor correction is connected between described low-pass filtering rectification circuit and the described semibridge system power output circuit, before the secondary hand off circuit is arranged at the power output pipe input stage of semibridge system power output circuit;
Also comprise the frequency sweep resonance build-up of luminance of a major loop that connects and composes by square-wave generator, triangular wave shaping circuit, control circuit for pulse-width modulation, plastic drive circuit and build-up of luminance failure of oscillation control circuit, the control circuit of dominant frequency ballast; Starter failure of oscillation control circuit, square-wave generator, triangular wave shaping circuit, control circuit for pulse-width modulation and plastic drive circuit are linked in sequence, plastic drive circuit output connects described secondary hand off circuit, and the control end of described build-up of luminance failure of oscillation control circuit connects described semibridge system power output circuit.
2. electronic ballast for high-strength gas discharge lamp according to claim 1; it is characterized in that: the frequency sweep resonance build-up of luminance of described major loop, the control circuit of dominant frequency ballast also comprise an output overcurrent protective circuit that is made of voltage comparator; the input of output overcurrent protective circuit connects described semibridge system power output circuit, and the output of output overcurrent protective circuit connects described control circuit for pulse-width modulation.
3. electronic ballast for high-strength gas discharge lamp according to claim 1 is characterized in that: described pulse frequency control type circuit of power factor correction comprises pulse frequency control type Zero Current Switch voltage stabilizing circuit that is connected and composed by pulse frequency control integrated chip and field effect transistor and the single-ended reverse exciting boost type circuit that is connected and composed by inductance, diode, electric capacity.
4. electronic ballast for high-strength gas discharge lamp according to claim 1 is characterized in that: described secondary hand off circuit is the quick leadage circuit of electric charge of the power output pipe that connected and composed by transistor, diode, resistance.
5. electronic ballast for high-strength gas discharge lamp according to claim 1, it is characterized in that: described square-wave generator is the inverting integrator that is connected and composed by operational amplifier, resistance, electric capacity, described triangular wave shaping circuit is the emitter follower that is connected and composed by operational amplifier, resistance, electric capacity, and described starter failure of oscillation circuit is the voltage comparator that is connected and composed by operational amplifier, resistance.
6. electronic ballast for high-strength gas discharge lamp according to claim 1 is characterized in that: the described square-wave generator that is linked in sequence, triangular wave shaping circuit and control circuit for pulse-width modulation are the frequency sweep circuits of the continuous square wave of output 28KHZ-100KHZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96207781 CN2258335Y (en) | 1996-04-12 | 1996-04-12 | Electronic ballast for high-intensity gas-discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96207781 CN2258335Y (en) | 1996-04-12 | 1996-04-12 | Electronic ballast for high-intensity gas-discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2258335Y true CN2258335Y (en) | 1997-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96207781 Expired - Fee Related CN2258335Y (en) | 1996-04-12 | 1996-04-12 | Electronic ballast for high-intensity gas-discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2258335Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1802062B (en) * | 2006-01-18 | 2010-08-11 | 李益民 | High strength electronic amperite of gas-discharge lamp |
| CN102238777A (en) * | 2010-05-07 | 2011-11-09 | 惠州元晖光电有限公司 | Triac dimmable power supply unit for LED |
-
1996
- 1996-04-12 CN CN 96207781 patent/CN2258335Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1802062B (en) * | 2006-01-18 | 2010-08-11 | 李益民 | High strength electronic amperite of gas-discharge lamp |
| CN102238777A (en) * | 2010-05-07 | 2011-11-09 | 惠州元晖光电有限公司 | Triac dimmable power supply unit for LED |
| CN102238777B (en) * | 2010-05-07 | 2014-08-20 | 惠州元晖光电股份有限公司 | Triac dimmable power supply unit for LED |
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Free format text: CORRECT: CO-PATENTEE TO: CHEN ZUOXIAN |
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Co-patentee after: Chen Zuoxian |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |