CN202068634U - Electronic ballast and automatic hot restart circuit of electronic ballast - Google Patents
Electronic ballast and automatic hot restart circuit of electronic ballast Download PDFInfo
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- CN202068634U CN202068634U CN2011201929182U CN201120192918U CN202068634U CN 202068634 U CN202068634 U CN 202068634U CN 2011201929182 U CN2011201929182 U CN 2011201929182U CN 201120192918 U CN201120192918 U CN 201120192918U CN 202068634 U CN202068634 U CN 202068634U
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Abstract
The utility model relates to an electronic ballast and an automatic hot restart circuit of the electronic ballast. The electronic ballast mainly comprises a bridge rectifier circuit, a power factor correction circuit and a power drive circuit. The output frequency of the power factor correction circuit is approximately 10 Hz-500 Hz low-frequency pulsing direct current. The power drive circuit is a half bridge power drive circuit, and the on-off frequency range is in a certain frequency range within 10 kHz-100 kHz. The electronic ballast is mainly used for metal halogen lamps and generates the 10Hz-500Hz pulsing direct current through a power number correcting circuit; and the power drive circuit performs on-off of sweep frequency within the frequency range of 10 kHz-100 kHz, so as to effectively control the problem of high-frequency acoustic resonance of the metal halogen lamps. The ballast has the advantages of small volume, light weight and low cost. The automatic hot restart circuit can automatically restart the electronic ballast so as to achieve the automatic lightening function when the metal halogen lamps are not lightened or an input power supply is off and then on, thereby being convenient in use.
Description
Technical field
The utility model relates to ballast, particularly relates to a kind of high frequency Electronic Ballast for Metal Halide Lamps and automatic hot restart circuit thereof.
Background technology
Electric ballast is compared the characteristics with small volume and less weight with Inductive ballast, for metal halogen lamp electric ballast, be to use direct current low-frequency square-wave type of drive to reduce at present mostly and eliminate the acoustic resonance phenomenon, this mode uses components and parts more, complex structure.
Summary of the invention
Based on this, be necessary to provide a kind of high-frequency electronic ballast that suppresses and eliminate Metal halogen lamp acoustic resonance phenomenon.
A kind of electric ballast comprises bridge rectifier, circuit of power factor correction and power driving circuit.Described power driving circuit is the half-bridge power drive circuit, and the switching frequency scope of this power driving circuit is 10kHz ~ 100kHz.
In a preferred embodiment, the output current of described circuit of power factor correction is that frequency is the low frequency pulsating direct current of 10Hz ~ 500Hz.
In a preferred embodiment, the minimum voltage of described low frequency pulsating direct current is about half of its ceiling voltage.
In a preferred embodiment, described electric ballast also comprises and is used for not sending drive signal in order to start the automatic hot restart circuit of described power driving circuit to described power driving circuit at input supply voltage short interruption or the electric ballast back loading that powers on when lighting.Described automatic hot restart circuit is connected between bridge rectifier and the power driving circuit.
In a preferred embodiment, described automatic hot restart circuit comprises restarts switch, self-lock switch, be used for after the self-lock switch conducting control described restart switch disconnect with stop be the self-lock switch power supply and behind delay predetermined time again control restart the detecting unit of switch conduction, and the triggering and the discharge cell that are used for after receiving an enabling signal, starting described power driving circuit.It is described that to restart switch be the Live switch that is used for when conducting sending to described triggering and discharge cell described enabling signal.Described self-lock switch for power at electric ballast that back loading is not successfully lighted or load conducting when extinguishing, conducting after the normally closed switch that when losing power supply, disconnects.
In a preferred embodiment, describedly restart switch and comprise first switching tube and second switch pipe.Described first switching tube is connected between described bridge rectifier and triggering and the discharge cell with normal conduction mode.One end of described second switch pipe is electrically connected with the described bridge rectifier and first control end of switching tube, other end ground connection, and its control end links to each other with the output of described detecting unit.
In a preferred embodiment, described detecting unit comprises control unit, unidirectional conduction pipe, the 5th resistance and first electric capacity.One end of described unidirectional conduction pipe links to each other with the input and first switching tube of discharge cell with described triggering, an end of the other end and described self-lock switch, the 5th resistance and first electric capacity, and the input of described control unit is electrically connected.The other end ground connection of described self-lock switch, the 5th resistance and first electric capacity.The output of described control unit links to each other with the control end of described second switch pipe as the output of detecting unit.
Described control unit for control second switch pipe conducting when its input becomes low level by high level so that first switching tube by and after time-delay a period of time control second switch pipe by so that first switching tube recovers the control unit of conducting.
In addition, also be necessary to provide a kind of and have the ballast of restarting function automatically with automatic hot restart circuit.
A kind of automatic hot restart circuit of electric ballast comprises restarts switch, self-lock switch, be used for after the self-lock switch conducting control described restart switch disconnect with stop be the self-lock switch power supply and behind delay predetermined time again control restart the detecting unit of switch conduction, and the triggering and the discharge cell that are used for after receiving an enabling signal, starting described power driving circuit.It is described that to restart switch be the Live switch that is used for when conducting sending to described triggering and discharge cell described enabling signal.Described self-lock switch for power at electric ballast that back loading is not successfully lighted or load conducting when extinguishing, conducting after the normally closed switch that when losing power supply, disconnects.
In a preferred embodiment, describedly restart switch and comprise first switching tube and second switch pipe.Described first switching tube is connected between described bridge rectifier and triggering and the discharge cell with normal conduction mode.One end of described second switch pipe is electrically connected with the described bridge rectifier and first control end of switching tube, other end ground connection, and its control end links to each other with the output of described detecting unit.Described detecting unit comprises control unit, unidirectional conduction pipe, the 5th resistance and first electric capacity.One end of described unidirectional conduction pipe links to each other with the input and first switching tube of discharge cell with described triggering, an end of the other end and described self-lock switch, the 5th resistance and first electric capacity, and the input of described control unit is electrically connected.The other end ground connection of described self-lock switch, the 5th resistance and first electric capacity.The output of described control unit links to each other with the control end of described second switch pipe as the output of detecting unit.
The utility model carries out the frequency sweep switch by making power driving circuit between 10kHz ~ 100kHz frequency band, effectively suppress the high frequency acoustic resonance problem of Metal halogen lamp.This electric ballast has smaller volume and lighter weight, and cost is also low.Because simple in structure, the power loss of ballast is little, thereby obtains better light efficiency, better light output stability.Automatically the hot restart circuit can not restarted electric ballast automatically after Metal halogen lamp is successfully lighted or import the of short duration outage of power supply, and is with the function that realizes lighting a lamp automatically, easy to use.
Description of drawings
Fig. 1 is the circuit theory diagrams of the electric ballast of an embodiment.
Fig. 2 is the circuit theory diagrams of the automatic hot restart circuit of an embodiment.
Fig. 3 is the circuit theory diagrams of the self-lock switch of an embodiment.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the utility model electric ballast and automatic hot restart circuit thereof are described in further detail.
As shown in Figure 1, the electric ballast of one embodiment comprises the EMI(Electromagnetic Compatibility that is electrically connected successively, Electro Magnetic Compatibility) circuit, bridge rectifier, PFC(Power Factor Correction, power factor correction) circuit and power driving circuit.Electric ballast also comprises the automatic hot restart circuit that links to each other with power driving circuit with bridge rectifier.The input of EMI circuit and input power supply link to each other as civil power.The output of power driving circuit and load electrically connect.Load is a high-intensity gas discharge lamp, is Metal halogen lamp in the present embodiment.This electric ballast can suppress and eliminate the acoustic resonance phenomenon of Metal halogen lamp, and its automatic hot restart circuit can not send drive signal from the trend power driving circuit after Metal halogen lamp is successfully lighted or import the of short duration outage of power supply, restart electric ballast.
In the present embodiment, EMI circuit, bridge rectifier and pfc circuit all can adopt existing circuit structure commonly used, do not repeat them here.Specifically, the output current of pfc circuit is that frequency is the low frequency pulsating direct current of 10Hz ~ 500Hz.Through checking repeatedly, adopt the low frequency pulsating direct current under this frequency band, the subsequent power drive circuit functionality easily realizes, Metal halogen lamp is not prone to the acoustic resonance phenomenon, not high to the circuit elements requirement on devices, the performance of circuit elements device also can be brought into play preferably, and circuit lifetime is long, and circuit structure is comparatively simple.Preferable, the frequency of this low frequency pulsating direct current or the multiple of input supply frequency close with the frequency of importing power supply, like this, thereby pfc circuit can obtain the low frequency pulsating direct current of corresponding frequencies section easily from the sampling of input power supply, and circuit structure is simple, easy to be realized.Certainly, also can increase frequency generator in addition and realize function.
The minimum voltage of this low frequency pulsating direct current is about half of its ceiling voltage, can prevent effectively that the pulsating direct current minimum voltage is lower than that the Metal halogen lamp pipe is pressed and the quenching problem that causes.
Power driving circuit is the half-bridge power drive circuit, and it comprises switching tube S1, switching tube S2, self-excitation transformer T, storage capacitor C3, resonant capacitance C4 and resonance inductance L 1.Wherein, switching tube S1 and switching tube S2 can be triode, IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or MOS(Metal-Oxid-Semiconductor, Metal-oxide-semicondutor) transistor.Self-excitation transformer T comprises 3 winding: T1, T2 and T3.The second end T32 end of the same name each other of the first end T11 of winding T1 and the first end T21 of winding T2 and winding T3.
First end of switching tube S1 is (as the collector electrode of triode, the drain electrode of IGBT or metal-oxide-semiconductor) is connected with the high-voltage output terminal of pfc circuit, its second end is (as the emitter of triode, the source electrode of IGBT or metal-oxide-semiconductor) links to each other with the first end T21 of the second end T12, the winding T2 of first end of switching tube S2, winding T1, its control end (as the base stage of triode, the grid of IGBT or metal-oxide-semiconductor) links to each other with the first end T11 of winding T1.Second end of switching tube S2 links to each other with the second end T32 of the low-voltage output of pfc circuit and winding T3, and its control end links to each other with the first end T31 of winding T3.One end of capacitor C 3 links to each other with the second end T22 of winding T2, and its other end links to each other with an end of inductance L 1.Capacitor C 4 is connected between first end of the other end of inductance L 1 and switching tube S1, is used to drive load.
Transformer T and switching tube S1, S2 constitute a frequency conversion self-excited oscillation circuit, thereby the height of the voltage of pfc circuit output changes the purpose that the input signal of self-excitation transformer T reaches frequency conversion.In the work, more near the peak of pfc circuit output voltage, the switching frequency of half-bridge power drive circuit is low more, more near the low ebb of pfc circuit output voltage, the switching frequency of half-bridge power drive circuit is high more, thereby reach the effect of frequency sweep, avoid loading under the same frequency and work, reach the purpose that reduces and eliminate the acoustic resonance phenomenon.In the present embodiment, the switching frequency scope of half-bridge power drive circuit is 10kHz ~ 100kHz.To circuit elements device performance requirement and not high, the circuit board electromagnetic interference is little at this frequency band, and circuit cost is lower, and the life-span is longer.Preferably, the switching frequency scope of half-bridge power drive circuit is any a section between 20kHz ~ 60kHz, and in this frequency band, circuit uses triode can reach optimum efficiency, and circuit cost is minimum.
As mentioned above, automatically the hot restart circuit is used for not sending drive signal to described power driving circuit at input supply voltage short interruption or the electric ballast back loading that powers on when lighting, the starting power drive circuit, thus restart electric ballast.In the present embodiment, automatically the hot restart circuit comprise self-lock switch K1, restart switch, detecting unit and triggering and discharge cell.Self-lock switch K1 links to each other with detecting unit.Self-lock switch K1 is a normally closed switch, and it powers on that back loading is not successfully lighted or load conducting when extinguishing at electric ballast, disconnects when losing power supply after the conducting.The circuit theory diagrams of self-lock switch K1 as shown in Figure 3, wherein terminal A is connected on the protective circuit, is used to judge whether Metal halogen lamp is lighted.
Restarting switch links to each other with discharge cell with output, detecting unit and the triggering of bridge rectifier.Restarting switch is Live switch, the output signal control of examined unit.Restart switch and when conducting, send enabling signal to triggering with discharge cell.
Detecting unit with restart switch and self-lock switch K1 and electrically connect.Detecting unit is used for controlling the described switch disconnection of restarting after the self-lock switch conducting, stop to be the self-lock switch power supply, self-lock switch is disconnected, and detecting unit is controlled and is restarted switch conduction behind the delay predetermined time, makes to restart switch and send enabling signal to described triggering and discharge cell once more.Trigger with discharge cell at every turn when receiving described enabling signal switching tube S1 or the S2 to power driving circuit send drive signal, thereby reach the purpose that starts electric ballast.
As shown in Figure 2, among the embodiment, restart switch and mainly comprise the first switching tube Q1 and second switch pipe Q2.The first and second switching tube Q1, Q2 can be triode, IGBT or MOS transistor.The first switching tube Q1 is connected between bridge rectifier and triggering and the discharge cell with normal conduction mode.Detecting unit mainly comprises control unit, unidirectional conduction pipe D1, the 5th resistance R 5 and first capacitor C 1.Unidirectional conduction pipe D1 is a diode.
First end of the first switching tube Q1 is (as the collector electrode of triode, the drain electrode of IGBT or metal-oxide-semiconductor) electrically connects by the output of resistance R 1 with bridge rectifier, its second end (as the emitter of triode, the source electrode of IGBT or metal-oxide-semiconductor) links to each other with the input of discharge cell and the anode of unidirectional conduction pipe D1 with triggering by resistance R 3.First end of second switch pipe Q2 and the control end of the first switching tube Q1 are (as the base stage of triode, the grid of IGBT or metal-oxide-semiconductor) links to each other, link to each other with first end of the first switching tube Q1 by resistance R 2 simultaneously, its second end ground connection, its control end links to each other with the output of control unit.The negative electrode of unidirectional conduction pipe D1 links to each other with the end of self-lock switch K1, also pass through an end of resistance R 4 and the 5th resistance R 5 and first capacitor C 1 simultaneously, and the input of control unit links to each other.The other end ground connection of self-lock switch K1, the 5th resistance R 5, first capacitor C 1.
The output control signal made second switch pipe Q2 conducting when control unit became low level (in the present embodiment when its input be low level during by self-lock switch K1 ground connection) at its input by high level so that the control end ground connection of the first switching tube Q1 and by.Control unit behind Preset Time, export once more control signal make second switch pipe Q2 by so that the first switching tube Q1 conducting once more, send enabling signal to triggering with discharge cell.
In the present embodiment, trigger with discharge cell and adopt integrating circuit, its inside is provided with one one end and links to each other the electric capacity of other end ground connection with the output of restarting switch.When the voltage height of this electric capacity behind preset value, trigger producing fluctuating signal with discharge cell and be used for the switching tube S1 or the S2 of starting power drive circuit as drive signal.After switching tube S1 and S2 work, triggering powers on this electric capacity with discharge cell and presses, and does not allow it charge once more.Thereby triggering and discharge cell be starting power drive circuit in a period of time that at every turn receives enabling signal again only.
Automatically the operation principle of hot restart circuit is: after electric ballast powers on, because resistance R 2 exists, the first switching tube Q1 is normal actuating switch, bridge rectifier is by restarting switch, also be that resistance R 1, the first switching tube Q1 and resistance R 2 are powered (sending enabling signal) to triggering with discharge cell, triggering and discharge cell are according to this drive half-bridge power drive circuit.The half-bridge power drive circuit is started working.If load successfully do not light or import power supply cut off the power supply midway (after incoming call) again cause under the situation that load extinguishes, self-lock switch K1 auto-closing, the input of control unit can detect low level, behind the time-delay certain hour, control unit output high level is with the second switch pipe Q2 conducting scheduled time, make the first switching tube Q1 by, at this moment self-lock switch K1 loses power supply and disconnects voluntarily, then control unit again output low level with second switch pipe Q2 by, make the first switching tube Q1 conducting, to triggering and the discharge cell power supply, at this moment circuit is restarted, and so circulation is till load is lighted.
Understandable, among other embodiment, can remove the EMI circuit according to the difference of load.Among other embodiment, also can be that self-excitation transformer T produces drive signal, be used for driving switch pipe S1, S2 to be operated in the frequency conversion state, as long as the switching frequency scope of power driving circuit is 10kHz ~ 100kHz by other circuit.
To sum up, the utility model carries out the frequency sweep switch by making power driving circuit between 10kHz ~ 100kHz frequency band, effectively suppresses or eliminate the high frequency acoustic resonance problem of Metal halogen lamp.Automatically the hot restart circuit can not restarted electric ballast automatically after the of short duration outage of power supply is lighted or import to Metal halogen lamp, and is with the function that realizes lighting a lamp automatically, easy to use.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. an electric ballast comprises bridge rectifier, circuit of power factor correction and power driving circuit, it is characterized in that, described power driving circuit is the half-bridge power drive circuit, and the switching frequency scope of this power driving circuit is 10kHz ~ 100kHz.
2. electric ballast according to claim 1 is characterized in that, the output current of described circuit of power factor correction is that frequency is the low frequency pulsating direct current of 10Hz ~ 500Hz.
3. electric ballast according to claim 2 is characterized in that the minimum voltage of described low frequency pulsating direct current is about half of its ceiling voltage.
4. according to each described electric ballast in the claim 1 to 3, it is characterized in that, described electric ballast comprises also and is used for not sending drive signal in order to start the automatic hot restart circuit of described power driving circuit to described power driving circuit at input supply voltage short interruption or the electric ballast back loading that powers on when lighting that described automatic hot restart circuit is connected between bridge rectifier and the power driving circuit.
5. electric ballast according to claim 4, it is characterized in that, described automatic hot restart circuit comprises restarts switch, self-lock switch, be used for after the self-lock switch conducting control described restart switch disconnect with stop be the self-lock switch power supply and behind delay predetermined time again control restart the detecting unit of switch conduction, and the triggering and the discharge cell that are used for after receiving an enabling signal, starting described power driving circuit; It is described that to restart switch be the Live switch that is used for when conducting sending to described triggering and discharge cell described enabling signal; Described self-lock switch for power at electric ballast that back loading is not successfully lighted or load conducting when extinguishing, conducting after the normally closed switch that when losing power supply, disconnects.
6. electric ballast according to claim 5 is characterized in that, describedly restarts switch and comprises first switching tube and second switch pipe; Described first switching tube is connected behind the described bridge rectifier between the power circuit and triggering and discharge cell with normal conduction mode; One end of described second switch pipe is connected with first control end of switching tube, other end ground connection, and its control end is by the output control of described detecting unit.
7. electric ballast according to claim 6 is characterized in that, described detecting unit comprises control unit, unidirectional conduction pipe, the 5th resistance and first electric capacity; One end of described unidirectional conduction pipe links to each other with the input and first switching tube of discharge cell with described triggering, an end of the other end and described self-lock switch, the 5th resistance and first electric capacity, and the input of described control unit is electrically connected; The other end ground connection of described self-lock switch, the 5th resistance and first electric capacity; The output of described control unit links to each other with the control end of described second switch pipe as the output of detecting unit.
8. electric ballast according to claim 7, it is characterized in that, described control unit for control second switch pipe conducting when its input becomes low level by high level so that first switching tube by and after time-delay a period of time control second switch pipe by so that first switching tube recovers the control unit of conducting.
9. the automatic hot restart circuit of an electric ballast, it is characterized in that, comprise and restart switch, self-lock switch, be used for after the self-lock switch conducting control described restart switch disconnect with stop be the self-lock switch power supply and behind delay predetermined time again control restart the detecting unit of switch conduction, and the triggering and the discharge cell that are used for after receiving an enabling signal, starting described power driving circuit; It is described that to restart switch be the Live switch that is used for when conducting sending to described triggering and discharge cell described enabling signal; Described self-lock switch for power at electric ballast that back loading is not successfully lighted or load conducting when extinguishing, conducting after the normally closed switch that when losing power supply, disconnects.
10. the automatic hot restart circuit of electric ballast according to claim 9 is characterized in that, describedly restarts switch and comprises first switching tube and second switch pipe; Described first switching tube is connected behind the described bridge rectifier between the power circuit and triggering and discharge cell with normal conduction mode; One end of described second switch pipe is electrically connected with first control end of switching tube, other end ground connection, and its control end links to each other with the output of described detecting unit; Described detecting unit comprises control unit, unidirectional conduction pipe, the 5th resistance and first electric capacity; One end of described unidirectional conduction pipe links to each other with the input and first switching tube of discharge cell with described triggering, an end of the other end and described self-lock switch, the 5th resistance and first electric capacity, and the input of described control unit is electrically connected; The other end ground connection of described self-lock switch, the 5th resistance and first electric capacity; The output of described control unit links to each other with the control end of described second switch pipe as the output of detecting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201929182U CN202068634U (en) | 2011-06-10 | 2011-06-10 | Electronic ballast and automatic hot restart circuit of electronic ballast |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201929182U CN202068634U (en) | 2011-06-10 | 2011-06-10 | Electronic ballast and automatic hot restart circuit of electronic ballast |
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| CN202068634U true CN202068634U (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201929182U Expired - Lifetime CN202068634U (en) | 2011-06-10 | 2011-06-10 | Electronic ballast and automatic hot restart circuit of electronic ballast |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281694A (en) * | 2011-06-10 | 2011-12-14 | 惠州雷士光电科技有限公司 | Electronic ballast and automatic hot-restarting circuit thereof |
-
2011
- 2011-06-10 CN CN2011201929182U patent/CN202068634U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281694A (en) * | 2011-06-10 | 2011-12-14 | 惠州雷士光电科技有限公司 | Electronic ballast and automatic hot-restarting circuit thereof |
| CN102281694B (en) * | 2011-06-10 | 2015-05-20 | 惠州雷士光电科技有限公司 | Electronic ballast and automatic hot-restarting circuit thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111207 Effective date of abandoning: 20150520 |
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| RGAV | Abandon patent right to avoid regrant |