CN101848590A - Electronic ballast circuit - Google Patents
Electronic ballast circuit Download PDFInfo
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- CN101848590A CN101848590A CN200910048406A CN200910048406A CN101848590A CN 101848590 A CN101848590 A CN 101848590A CN 200910048406 A CN200910048406 A CN 200910048406A CN 200910048406 A CN200910048406 A CN 200910048406A CN 101848590 A CN101848590 A CN 101848590A
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Abstract
The invention discloses an electronic ballast circuit for low-voltage discharge lamps, which relates to a dimming electronic ballast circuit for fluorescent lamps or energy-saving lamps. The invention is an innovative dimming technique. The electronic ballast circuit adopts the output of an intermittent oscillation circuit to control the switching circuit of power transistors, and the outputted regulated direct-current bus voltage is converted from DC to AC and into high frequency, and is then used for driving a light tube. Because the average brightness of the light tube completely depends on the length of the intermittent time of the oscillation circuit, the average brightness is linearly correlated to the conduction angle of an all-purpose phase-cut dimmer, so the dimming performance is extremely high. In addition, because intermittent oscillation is controlled by direct-current ripple voltage, when the voltage outputted by the dimmer is lower than the normal operation range, an oscillator can stop operation according to presetting, and the high-frequency output is automatically cut off. Consequently, the unstable operation of the light tube is avoided, the light tube is protected, and the service life of a lamp is prolonged. Because the operation frequency of the circuit is fixed, the circuit efficiency can be easily optimized, and the consistency of products is increased.
Description
One, technical field
The present invention relates to a kind of gas discharge electronic lamp ballasting circuit, particularly fluorescent lamp or electricity-saving lamp dimming electronic ballasting circuit.
Two, background technology
Use in the dimming electronic ballast circuit at known gas discharge fluorescent lamp or electricity-saving lamp, generally the circuit of Cai Yonging has the auto-excitation type half-bridge oscillation circuit, it is the feedback generation self-oscillation of adopting lamp current, by switching circuit direct voltage is converted to high frequency voltage, the gas discharge lamp fluorescent tube.Utilize external dimmer to change the input voltage of circuit, can regulate the lamp current that drive circuit is exported, reach the purpose of regulating the output of fluorescent tube light; Also have and adopt complicated special-purpose microelectronic chip circuit, produce high-frequency signal and control the semibridge system switching circuit, change the direct voltage behind the power rectifier into high frequency voltage then and drive fluorescent tube.And the output frequency of chip circuit can be adjusted variation according to the waveform of input power supply signal, thereby the high-frequency current frequency of controlling by fluorescent tube reaches the light modulation purpose; The third tunable optical electric drive circuit is to adopt the source oscillation signal of the constant continuous output of frequency to come the driving switch circuit, simultaneously by input voltage amplitude or the waveform of adjusting the electronic ballast circuit, change the operating voltage amplitude or the waveform that are carried on the switching circuit dc bus, make the high frequency voltage that outputs on the fluorescent tube after the switching circuit conversion be subjected to corresponding adjustment, adjust lamp tube current with this and change, reach the purpose of light modulation.More than several known methods in the application of actual product, all have different shortcomings.The shortcoming of first method is: because the operating state and the lamp tube current of drive circuit depend on that all the direct current after the AC power rectification charges and discharge voltage and waveform, what the operating state of circuit was mainly followed the tracks of is the crest voltage of importing behind external dimmer.And the dimmer of phase cut commonly used, in its adjustable range, the crest voltage of its output is not fully with angle of flow linear change, i.e. and the position of variation of the output of drive circuit and dimmer adjustment is not synchronous.Than following the incandescent lamp light modulation that changes according to Mean Input Power, its dimming effect of this electric ballast falls far short.In addition, when being in the low-power end at dimmer, because the bus direct-current working volts are low excessively, circuit and lamp works are all unstable, damage fluorescent tube easily;
The shortcoming of second method is: though comparatively Steady is fixed for link performance, operating frequency changes in the scope in quite wide deciding owing to require to fill perhaps, is difficult to optimize circuit efficient.And complex circuit, manufacturing cost is too high, is not easy to popularize;
The third type: owing to directly adopt the rectification output dc pulse busbar voltage that is subjected to external dimmer control as working power, thereby the high frequency voltage of inverter circuit output modulates by dc pulse, and poor stability is easy to generate in the fluorescent tube ignition procedures and flashes.And system's input-output characteristic of whole lamp can be subjected to the influence of different dimmers, so consistency is poor during practical application.
Three, summary of the invention
Purpose of the present invention is exactly to provide a kind of new electronic ballast circuit that can light modulation at the shortcoming that above-mentioned each circuit exists.
The present invention realizes as follows: a kind of electronic ballast circuit comprises the power supply of rectification circuit, switching inverter circuit, oscillating circuit, independent oscillating circuit, dimmer.Be output as pulsating dc voltage from the voltage of power supply input behind rectification circuit, this output ripple direct voltage is divided into two the tunnel, and wherein one the tunnel after transistor isolation, again through capacitor filtering, is connected on the switching inverter circuit as the dc bus working power; Another road is directly inputted to the power supply of oscillating circuit, through constant amplitude of output after the oscillating circuit shaping, duty ratio is subjected to the square wave of dimmer control, the power supply of oscillating circuit is connected to oscillating circuit, this oscillating circuit is output as the discontinuous operation high-frequency signal of fixed-frequency of square-wave frequency modulation that amplitude is subjected to the power supply of oscillating circuit. and this discontinuous operation high-frequency signal inserts the signal input end of switching inverter circuit as control signal, switching inverter circuit is high-frequency and high-voltage output with the working power inversion of dc bus, this voltage via choke induction after output connect fluorescent tube.
Described rectification circuit also can be made up of two independent rectification units, gives duplex feeding respectively.
The present invention is the new light-dimming method of a kind of Chong, and it adopts the output of an intermittent oscillation circuit to come the transistorized switching circuit of power controlling, carries out DC/AC on the output DC bus-bar voltage after the Will rectification and is converted to high frequency, then in order to drive fluorescent tube.And this intermittent oscillation circuit is not continuous operation, and its vibration and the duty ratio of resting are to be controlled by the width of the pulsating direct current waveform of AC-input voltage after by rectification.The DC pulse width of the AC power of this input is determined by the silicon controlled angle of flow.In other words, the work duty ratio of intermittent oscillation circuit is the triggering phase control that directly is subjected to dimmer.And the switching inverter circuit that carries out the DC/AC conversion in this circuit is by oscillating circuit signal output control, therefore also be intermittently used, thereby also be intermittently used by the switching circuit output stream through the high-frequency ac of fluorescent tube, so fluorescent tube in fact also is an intermittently used.Its work length is intermittently determined by oscillating circuit fully.DC bus-bar voltage has been eliminated the dimmer difference through capacitance energy storage filtering, and the influence of DC bus-bar voltage pulsation instability.Because the fluorescent tube mean flow rate is determined by oscillator intermittently used length fully, is relevant with dimmer phase linearity of living in therefore, adjusting function utmost point Cui.In addition, because intermittent oscillation is by dc pulse moving voltage control, so dimmer is when exporting residing voltage and being lower than normal range of operation, and oscillator can cut off according to presetting to set automatically.So just avoid the instability of lamp works, protected fluorescent tube, prolonged the life-span of lamp.Circuit of the present invention, its operating frequency is fixed, and because of than being easier to optimize circuit efficient, and improves consistency of product.
Four, description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is the circuit block diagram of another kind of embodiment of the present invention.
Five, embodiment
Below in conjunction with the description of drawings embodiments of the invention.
Referring to Fig. 1, the present invention mainly is made up of power supply 6, the oscillating circuit 7 of rectification circuit 2, oscillating circuit and the switching inverter circuit 5 that controlled by oscillator output signal.Behind filter network 1, rectification circuit 2, be output as pulsating dc voltage from the voltage of power supply input.This output ripple direct voltage is divided into two the tunnel, and wherein one the tunnel with after transistor 3 isolation, is connected on the switching inverter circuit 5 as the dc bus working power through capacitor filtering 4 again; Another road of pulsating dc voltage of rectification circuit 2 outputs, be directly inputted to the power supply 6 of oscillating circuit, be subjected to the square wave of dimmer control through output constant amplitude, duty ratio after the power circuit shaping, the power supply 6 of oscillating circuit connects oscillating circuit 7, this oscillator is output as the intermittently used high-frequency signal of fixed-frequency that amplitude is subjected to the power supply square-wave frequency modulation of oscillating circuit, and this discontinuous operation high-frequency signal inserts the signal input end of switching inverter circuit 5 as control signal.Switching inverter circuit is high-frequency and high-voltage output with the operating voltage inversion of dc bus, and this output voltage connects fluorescent tube via choke induction 8 backs by ballast output.
Fig. 2 is another kind of embodiment of the present invention, and it mainly is made up of power supply 16, the oscillating circuit 17 of rectification circuit 12,13, oscillating circuit and the switching inverter circuit 15 that controlled by its output signal.Be divided into two tunnel, one tunnel output behind rectification circuit 12 from power input voltage, insert dc bus through capacitor filtering 14 again and be connected on the switching inverter circuit 15 as working power; The pulsating dc voltage that export after another group rectification circuit 13 rectifications on another road, be directly inputted to the power supply 16 of oscillating circuit, through exporting the square wave that a constant amplitude duty ratio is subjected to the square wave of dimmer control after the power circuit shaping, the power supply 16 of oscillating circuit is connected to oscillating circuit 17.Oscillating circuit is output as the discontinuous operation high-frequency signal of fixed-frequency of square-wave frequency modulation that amplitude is subjected to the power supply 16 of oscillating circuit.This discontinuous operation high-frequency signal inserts the signal input end of switching inverter circuit 15 as control signal, switching inverter circuit is high-frequency and high-voltage output with the operating voltage inversion of dc bus, and this voltage is through connecting fluorescent tube by ballast output behind choke induction 19.
Claims (2)
1. an electronic ballast circuit comprises power supply (6), the oscillating circuit (7) of rectification circuit (2), switching inverter circuit (5), oscillating circuit, it is characterized in that behind rectification circuit, being output as pulsating dc voltage from the voltage of power supply input, this pulsating dc voltage is divided into two the tunnel, wherein one the tunnel after transistor (3) is isolated, through capacitor filtering (4), be connected on the switching inverter circuit (5) again as the dc bus working power; Another road is input to the power supply (6) of oscillating circuit, through a series of constant amplitude of output behind this power circuit, duty ratio is subjected to the pulse of approximate square wave of the pulse width control of pulsating dc voltage, connect and be transported to oscillating circuit (7), and oscillating circuit (7) output, amplitude is subjected to the fixed-frequency of square-wave frequency modulation of oscillation circuit power (6) and the intermittently used high-frequency signal, insert the signal input end of switching inverter circuit (5) as control signal, the control switch inverter circuit is high-frequency and high-voltage output with the operating voltage inversion of dc bus, connects fluorescent tube by ballast output behind choke induction (8).
2. according to the electronic ballast circuit of claim 1, it is characterized in that described rectification circuit also can be made up of two independent rectification units, give duplex feeding respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910048406A CN101848590A (en) | 2009-03-27 | 2009-03-27 | Electronic ballast circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910048406A CN101848590A (en) | 2009-03-27 | 2009-03-27 | Electronic ballast circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101848590A true CN101848590A (en) | 2010-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910048406A Pending CN101848590A (en) | 2009-03-27 | 2009-03-27 | Electronic ballast circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315388A (en) * | 2021-06-25 | 2021-08-27 | 江苏容正医药科技有限公司 | High-power-density long-life high-frequency pulse alternating-current power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2515919Y (en) * | 2001-12-05 | 2002-10-09 | 马士科技有限公司 | Adjustable light fluorescent lamp device using mached with silicon controlled PM light modulator |
| CN1596565A (en) * | 2002-06-07 | 2005-03-16 | 松下电器产业株式会社 | Electrodeless light bulb type fluorescent lamp and discharge lamp lighting device |
| CN2930191Y (en) * | 2005-08-25 | 2007-08-01 | 陈亮 | AC-to-DC current tramsformer power source with power factor regulating function for lamp |
-
2009
- 2009-03-27 CN CN200910048406A patent/CN101848590A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2515919Y (en) * | 2001-12-05 | 2002-10-09 | 马士科技有限公司 | Adjustable light fluorescent lamp device using mached with silicon controlled PM light modulator |
| CN1596565A (en) * | 2002-06-07 | 2005-03-16 | 松下电器产业株式会社 | Electrodeless light bulb type fluorescent lamp and discharge lamp lighting device |
| CN2930191Y (en) * | 2005-08-25 | 2007-08-01 | 陈亮 | AC-to-DC current tramsformer power source with power factor regulating function for lamp |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315388A (en) * | 2021-06-25 | 2021-08-27 | 江苏容正医药科技有限公司 | High-power-density long-life high-frequency pulse alternating-current power supply |
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Addressee: Guan Dewei Document name: Notification of Passing Examination on Formalities |
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Application publication date: 20100929 |