CN2304226Y - Electronic ballast for sodium lamp - Google Patents
Electronic ballast for sodium lamp Download PDFInfo
- Publication number
- CN2304226Y CN2304226Y CN 97237242 CN97237242U CN2304226Y CN 2304226 Y CN2304226 Y CN 2304226Y CN 97237242 CN97237242 CN 97237242 CN 97237242 U CN97237242 U CN 97237242U CN 2304226 Y CN2304226 Y CN 2304226Y
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Abstract
The utility model relates to an electronic ballast for a sodium lamp. The filtration and rectification of AC can be realized, the AC can be input into a chopper circuit 3, and constant direct current voltage can be obtained. A high frequency voltage can be obtained by a high frequency transformer 4 and is input into a primary side winding N1 of a transformer 7, and the high frequency voltage can be promoted through a secondary side winding N2 and is added at both ends of a sodium lamp 9. An induced voltage as a feedback signal in a primary side additional winding N3 is sent to one error amplifier in an integrated circuit IC2 of a pulse width modulator 5 via a high-frequency transformer 4, and voltage outputted to the N1 can be a definite value, voltage reduction on an R10 can be realized by the other error amplifier of the IC 2 via output current, the output current can be acted as a feedback signal, and firm current can be outputted.
Description
The utility model is relevant with electronic ballast of sodium lamp.
At present be that the matching used ballast majority of high-pressure sodium lamp is the inductive ballast, part is used electric ballast.
Inductive town source device no doubt has the advantage that the life-span is long, performance is reliable, but its shortcoming also be give prominence to, its shortcoming is: own loss big (accounting for the 10%-20% of lamp power), weight and volume is bigger, need to consume materials such as a large amount of silicon steel sheets and copper, noise is bigger during work, the power factor of system is low, and lamp power changes with power source change.
In order to overcome the shortcoming of inductive town source device, developed the electric ballast of various different circuit structures in recent years, but the system power factor of these electric ballasts is still lower, great majority have only 0.6-0.7, the harmonic content height, when this electric ballast of a large amount of concentrated uses, very big triple harmonic current will appear in the center line of electrical network, have a strong impact on the operate as normal of supply transformer, in addition, these electric ballasts, frequency is mostly unstable, and it is with supply voltage, fluorescent tube is pressed, the variation of lamp power and changing, thereby fall into the frequency band of sodium vapor lamp unstable operation easily, make the sodium vapor lamp can not steady operation.
The purpose of this utility model provides a kind of power factor height, and is energy-conservation, and the harmonic content in the input current is little, can make the electronic ballast of sodium lamp of sodium vapor lamp working stability.
The utility model is achieved in that
Alternating current is imported booster type chopper circuit 3 and is obtained constant DC pressure behind filter rectification, get the former limit winding N1 that a high frequency voltage outputs to transformer 7 through push-pull type high-frequency converter 4 again, after promoting, secondary winding N2 is added to the two ends of sodium vapor lamp 9, the voltage of responding among the additional winding N3 in the former limit of transformer 7 is delivered to a error amplifier in the integrated circuit (IC) 2 of pulse width modulator 5 with control output voltage as feedback signal, add to push-pull type high-frequency converter 4, its voltage that outputs to N1 is equaled or near set point, the pulse frequency of IC2 is by timing resistor R19, timing capacitor C21 is set in the sodium vapor lamp steady operation frequency band, and another error amplifier of IC2 is made feedback signal to stablize output current by the pressure drop of output current on R10.
Booster type chopper circuit 3 of the present utility model is formed switching circuit by integrated circuit (IC) 1 (UC3842) and switching tube Q1, its switching frequency is set by timing resistor R3 and timing capacitor C8, the switch connection time is by the voltage drop Vd size control of R10, circuit 3 is connected with input through inductance T2 (L), and charging capacitor C11 is arranged.
The alternating voltage that is directly proportional with electric current with the current transformer T6 of sodium vapor lamp 9 parallel connections output behind rectifying and wave-filtering to overcurrent protection and timing circuit 6; one the tunnel adds to the base stage of transistor Q7 through voltage stabilizing didoe Z3; make the Q7 conducting; and with 2 of integrated circuit (IC) 3 timers; 6 pin are pulled to low level; the base stage of transistor Q6 is then delivered on another road; make the Q6 saturation conduction; 5 pin of IC3 also are pulled to low level; this moment, 3 pin of IC3 were exported 4 pin that high level adds to IC2, blocked the output of pulse width modulator 5, after overcurrent disappears; through the certain hour that IC3 sets, automatically terminate blockade to the output pulse.
The accessory power supply 8 that another road of voltage of additional winding N3 induction is formed through current-limiting resistance R and voltage-stabiliser tube Z1 is for integrated circuit provides direct voltage, Z1 by current-limiting resistance R27 with import power circuit and be connected.
The utlity model has following advantage:
1, little, in light weight, the efficient high (economize on electricity) of volume.
2, power factor height can reach 0.99.
3, the harmonic content in the input power supply is little.
4, the operating frequency of ballast is arranged in the steady operation frequency band of sodium vapor lamp, and the operating frequency of setting immobilizes, thereby can guarantee the sodium vapor lamp steady operation.
5, adopt the power supply FEEDBACK CONTROL, keep power of sodium lamp constant.
6, has time-delay repeated priming function.
Following is accompanying drawing of the present utility model:
Fig. 1 is a block diagram of the present utility model.
Fig. 2 is the equivalent circuit diagram of booster type chopper circuit.
Fig. 3 is input voltage, the current waveform figure of booster type chopper circuit.
Fig. 4 is an input voltage and input current oscillogram of the present utility model.
Fig. 5 is circuit theory diagrams of the present utility model.
Following is embodiment of the present utility model:
The utility model is by inlet wire filter 1, rectification circuit 2, pulse-width-modulation chopper 3, push-pull type high-frequency converter 4, output transformer 7, and current regulator and pulse width control circuit 5, and overcurrent protection and timer 6 etc. are partly formed.
Input ac voltage becomes behind inlet wire filter and rectifier bridge and has the voltage of waveform as shown in Figure 3.The effect of filter (circuit of being made up of C1, C2, C3, T1 and C4 among Fig. 5) is: the high-frequency harmonic that reduces in the power supply flows into electrical network to the interference of ballast and the high-frequency harmonic electric current that suppresses to produce when ballast is worked.The voltage V1 that obtains after the rectification obtains a constant DC and presses behind the booster type chopper circuit, be transformed into the high frequency voltage of square wave again through the push-pull type high-frequency converter, this voltage adds to sodium vapor lamp after high-frequency output transformer secondary winding N2 promotes, the voltage of responding among the additional winding N3 of another of high-frequency output transformer is through rectification, obtain a smooth dc voltage that is directly proportional with the N2 output voltage after the filtering, this voltage one tunnel feeds back through R25 as output voltage, R26, deliver among the IC2 by error amplifier 1 and R20 after the attenuator circuit decay that W2 forms, the in-phase input end A1+ of the voltage regulator that C23 forms, another Lu Zejing current-limiting resistance R and voltage-stabiliser tube Z1 obtain+the 12V direct voltage: for control circuit provides+the 12V working power, when ballast starts, owing to do not set up voltage as yet among the N3, the required power supply of control circuit this moment is provided by the interim power supply that current-limiting resistance R27 and voltage-stabiliser tube Z1 form, after ballast is started working, just provide power supply by N3.
Between rectification circuit and push-pull type high-frequency converter, insert the booster type chopper circuit of forming by IC1 (UC3842), Q1, T2, D6 and Cl3, the effect of this circuit has the two, the one, improves the power factor of input and reduces to import the harmonic content, the 2nd of power supply, and keeping the input direct voltage of high-frequency converter is a steady state value, and the operation principle of circuit is as follows:
The equivalent circuit of chopper circuit as shown in Figure 2, wherein S is the equivalent switch that IC1, Q1 form, its switching frequency is set (see figure 5) by timing resistor R3 and timing capacitor C8, be tens kilo hertzs, the length of the turn-on time of switch is subjected to Vd size control (voltage negative feedback), when S connects, A point shorted to earth, flow through a short circuit power supply (only need the instantaneous value of V1 to be slightly larger than zero, will produce this short circuit current) among the L, the energy storage of short circuit current in L is L/2 ∫
o T1I2dt (t
1Be S turn-on time, L is an inductance value, i is the current instantaneous value that flows through L), when the controlled disconnection of S, the energy storage among the L sends capacitor C to by isolating diode D, promptly C is charged, because the effect of this circuit, even the instantaneous value that makes V1 and Vin is during much smaller than direct voltage Vd, electrical network also can provide electric current to ballast, thereby input current just has as shown in Figure 4 very near sinusoidal waveform.Compare with the circuit of common rectification one filtering, not only improved input power factor greatly, and (the triple-frequency harmonics amplitude of the input current of circuit can reach 100% of fundamental voltage amplitude usually to have reduced the harmonic content in the electric current significantly, even higher, and triple-frequency harmonics amplitude of the present utility model is below 1%).
Adopt IC2 (TL494) to make width modulator in the arteries and veins, pulse frequency is fixed, and is set in the sodium vapor lamp steady operation frequency band by timing resistor R19 and timing capacitor C21, guarantees that sodium vapor lamp can steady operation.The output voltage of an additional winding of high-frequency output transformer provides working power for IC2 on the one hand after D9, D10 full-wave rectification, on the other hand through R25, after R26, the W2 dividing potential drop, as voltage feedback signal, send an error amplifier among the IC2, with control output voltage.Another error amplifier of IC2 then utilizes the pressure drop of output current on R10 to make feedback signal to stablize output current.
Overcurrent protection is achieved as follows with the automatic repeated priming function of time-delay; when overcurrent takes place in output; the alternating voltage that current transformer T6 output is directly proportional with electric current; through D11; after the whole ripple filtering of C27, the one tunnel adds to the Q7 base stage through voltage stabilizing didoe Z3 (voltage is higher than Z3 voltage stabilizing value), makes the Q7 conducting; and with " 2 " of timer; " 6 " pin is pulled to low level, and the base stage of Q6 is then delivered on another road, makes the Q6 saturation conduction; " 5 " pin of timer also is pulled to low level; the high level of " 3 " pin output at this moment is added to " 4 " pin of IC2 through R31 after the R23 dividing potential drop, block the output of pulse width modulator; thereby realization overcurrent protection function; after overcurrent disappeared, " 5 " pin of timer reverted to high level, " 2 "; " 6 " pin voltage rises gradually; after 5 minutes, the output of " 3 " pin becomes low level by high level, and " 4 " pin current potential of IC2 reduces; releasing is restarted thereby realize delaying time the blockade of pulse width modulator output.
The effect of voltage regulator is the automatic stabilisation output voltage, when output voltage is higher than set point (output voltage can be set by the size of regulating W2), the N3 output voltage that is directly proportional with it also be higher than A1 one terminal voltage (this voltage by IC2 output+5V parameter voltage through R21, obtain after the R2 dividing potential drop, when R21=R22 be+2.5V), the output of voltage regulator reduces the pulse duration of the pulse width modulator output among the IC2, add to the switching tube Q4 of push-pull converter and the pulse drive signal of Q5 also reduces by driving transformer T3 and T4, Q4, Q5 conducting (Q4, Q5 is that defeated conductance is logical) time shorten, thereby output voltage is reduced, until output voltage equal or very near set point till, when output voltage is lower than set point, the effect of voltage-regulation increases pulse duration, correspondingly output voltage also raises, till reaching set point.
Two switching tube Q4 of push-pull converter, insert respectively between the base stage of Q5 and the emitter by Q2, R11, D16, C14 and Q3, R12, D17, two circuit that C15 forms, its effect is in order to quicken the shutoff of Q4 and Q5, to reduce the switching loss of switching tube, the operation principle of two circuit is identical, below only one of them circuit is illustrated, when T3 exports a pulse voltage, Q4 base stage injection-base current IB produces on R13-voltage drop on right "+" left side "-", this voltage makes C14 charge by D16, its polarity is last "-", "+" down, Q2 this moment is the remain off state because its base stage is partially anti-, therefore, this circuit does not produce any influence to the opening process of Q4, when the T3 pulse ended, C14 passed through R13, the base stage discharge of R11 and Q2, the Q2 conducting, insert the VC14 reversed bias voltage between the base stage of Q4 and the emitter, thereby make Q4 quicken to turn-off.
Both sides, the former and deputy limit of high frequency transformer are connected to the resistance capaciting absorpting circuit of R16, C16 and R17, C19 composition, in order to absorb the peak voltage that switching process produced.
Switching tube Q4 in the push-pull converter and Q5 fast recovery diode D7, a D8 in parallel respectively and resistance capaciting absorpting circuit R14, C16, R15, C17.The effect that absorbs circuit also is that the effect of parallel diode D7, D8 is as follows in order to the absorption peak voltage that switching process produced:
When the Q4 conducting, electric current flows to the DC power supply negative terminal by the DC power supply anode through the former limit of high frequency transformer winding N1-1 switching tube Q4.When Q4 turn-offs, the magnetic field energy part of former limit winding (with the part of secondary winding coupled) is released by sodium vapor lamp by the secondary winding, another part (leakage inductance of corresponding former limit winding) then will produce an electromotive force in N1-1 and N1-2, if there is not D8, then will add a peak voltage much larger than DC power supply voltage between the collector electrode of Q4 and the emitter; Q4 just may be breakdown because of overvoltage.When being connected to diode D8, the electromotive force of N1-2 induction just can produce electric current by the path that DC power supply and diode D8 constitute, and discharges the energy storage in the leakage inductance, peak voltage value on the Q4 is reduced greatly, the effect of D7 is identical with D8, and the only shutoff of corresponding Q5 is at this repeated description no longer just.
The working power of IC1 is provided by two parts, when ballast rigidly connects energize, by the R1 step-down, provides after the C6 filtering; After the Q1 work, the former limit of T2 has sawtooth current to flow through, and its secondary just produces the voltage of a similar waveform, and this voltage provides working power for IC1 after D5 halfwave rectifier and C6 filtering.
Claims (4)
1, a kind of electronic ballast of sodium lamp, it is characterized in that alternating current imports booster type chopper circuit (3) and obtain a constant DC and press behind filter rectification, get the former limit winding N1 that a high frequency voltage outputs to transformer (7) through pushing off formula high-frequency converter (4) again, after promoting, secondary winding N2 is added to the two ends of sodium vapor lamp (9), the voltage of responding among the additional winding N3 in the former limit of transformer (7) is delivered to a error amplifier in the integrated circuit (IC) 2 of pulse width modulator (5) with control output voltage as feedback signal, add to push-pull type high-frequency converter (4), its voltage that outputs to N1 is equaled or near set point, the pulse frequency of IC2 is by timing resistor R19, timing capacitor C21 is set in the sodium vapor lamp steady operation frequency band, and another error amplifier of IC2 is made feedback signal to stablize output current by the pressure drop of output current on R10.
2, electronic ballast of sodium lamp according to claim 1, it is characterized in that said booster type chopper circuit (3) forms switching circuit by integrated circuit (IC) 1 (UC3842) and switching tube Q1, its switching frequency is set by timing resistor R3 and timing capacitor C8, the switch connection time is by the size control of the voltage drop Vd of R10, circuit (3) is connected with input through inductance T2 (L), and charging capacitor C11 is arranged.
3; electronic ballast of sodium lamp according to claim 1 and 2; it is characterized in that the alternating voltage that is directly proportional with electric current with the in parallel current transformer T6 output of sodium vapor lamp (9) behind rectifying and wave-filtering to overcurrent protection and timing circuit (6); one the tunnel adds to the base stage of transistor Q7 through voltage stabilizing didoe Z3; make the Q7 conducting; and with 2 of integrated circuit (IC) 3 timers; 6 pin are pulled to low level; the base stage of transistor Q6 is then delivered on another road; make the Q6 saturation conduction; 5 pin of IC3 also are pulled to low level; this moment, 3 pin of IC3 were exported 4 pin that high level adds to IC2 (TL494); block the output of pulse width modulator (5); after overcurrent disappears,, automatically terminate blockade to the output pulse through the certain hour that IC3 (NE555) sets.
4, mark 3 described electronic ballast of sodium lamp according to right, the accessory power supply (8) that another road of voltage that it is characterized in that N3 induction is formed through current-limiting resistance R and voltage-stabiliser tube Z1 is for integrated circuit provides direct voltage, Z1 by current-limiting resistance R27 with import power circuit and be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97237242 CN2304226Y (en) | 1997-06-23 | 1997-06-23 | Electronic ballast for sodium lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97237242 CN2304226Y (en) | 1997-06-23 | 1997-06-23 | Electronic ballast for sodium lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2304226Y true CN2304226Y (en) | 1999-01-13 |
Family
ID=33947929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97237242 Expired - Fee Related CN2304226Y (en) | 1997-06-23 | 1997-06-23 | Electronic ballast for sodium lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2304226Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102057758A (en) * | 2008-06-10 | 2011-05-11 | 奥斯兰姆施尔凡尼亚公司 | Multi-lamps instant start electronic ballast |
-
1997
- 1997-06-23 CN CN 97237242 patent/CN2304226Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102057758A (en) * | 2008-06-10 | 2011-05-11 | 奥斯兰姆施尔凡尼亚公司 | Multi-lamps instant start electronic ballast |
| CN102057758B (en) * | 2008-06-10 | 2013-12-25 | 奥斯兰姆施尔凡尼亚公司 | Multi-lamps instant start electronic ballast |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |