CN201369866Y - Pulse width modulation electronic ballast - Google Patents
Pulse width modulation electronic ballast Download PDFInfo
- Publication number
- CN201369866Y CN201369866Y CNU200920032151XU CN200920032151U CN201369866Y CN 201369866 Y CN201369866 Y CN 201369866Y CN U200920032151X U CNU200920032151X U CN U200920032151XU CN 200920032151 U CN200920032151 U CN 200920032151U CN 201369866 Y CN201369866 Y CN 201369866Y
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- China
- Prior art keywords
- voltage
- feedback unit
- circuit
- output
- width modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Inverter Devices (AREA)
Abstract
The utility model discloses a pulse width modulation electronic ballast comprising a filter circuit connected with an alternating current power supply, a rectifying circuit converting input alternating current Ui into direct current Ud, an oscillatory circuit connected at two output ends of the rectifying circuit, a filter capacitor C and a power output circuit connected with the oscillatory circuit. A power supply circuit between the rectifying circuit and the oscillatory circuit is connected with a power switch used for starting the oscillatory circuit in series. The electronic ballast also comprises a voltage on line side feedback unit for detecting the voltage value of Ui or Ud in real time, an output direct current voltage feedback unit for detecting the voltage value of the filter capacitor C in real time, a switch adjuster for adjusting the duty ratio of the power switch, and a PWM comparator for controlling the switch adjuster correspondingly according to signals detected by the voltage on line side feedback unit and the output direct current voltage feedback unit. The electronic ballast is reasonable in design, high in reliability and simple and convenient in use and operation, and can effectively solve the steady operation problem of electroless lamps.
Description
Technical field
The utility model relates to a kind of electric ballast, especially relates to a kind of pulse-width modulation electric ballast that is applicable to electrodeless lamp.
Background technology
In the last few years, the electric ballast technical development was rapid, and many famous semiconductor companies all are devoted to develop in the research and development of the special-purpose control integrated circuit of electric ballast.Up to the present, the special-purpose control IC of three classes has appearred.Wherein, the first kind is active power factor control (Power Factor Controller, PFC) circuit, this circuit makes the input characteristics of electric ballast improve greatly, input current waveform is followed the tracks of input voltage waveform, become sine wave, reach power factor approach 1 and the total harmonic wave of input current less than 10% ideal effect.Second class is the drive IC of POWER VD metal-oxide-semiconductor, and this type of control IC is simplified inverter circuit greatly, and effect is fine.The 3rd class integrates preceding two class control IC exactly, has concentrated the advantage of preceding two classes.
The sign of second generation electric ballast is the electric ballast that has adopted active power factor preposing conversion device, the core of this active power factor preposing conversion device is exactly the active power factor control circuit, this electron rectifier circuit structure is simple, has that volume is little, the reliability advantages of higher.Utilize the design philosophy of above-mentioned electron rectifier circuit, develop the special-purpose integrated controll block that is fit to the electrodeless lamp work of control and makes electrodeless lamp steady operation, will bring material impact the development and the application of electrodeless lamp.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of pulse-width modulation electric ballast at above-mentioned deficiency of the prior art, and it is reasonable in design, reliability is high and it is easy and simple to handle to use, and can effectively solve the steady operation problem of electrodeless lamp.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of pulse-width modulation electric ballast, comprise the filter circuit that joins with AC power, with the input AC electricity Ui of institute be converted to direct current Ud rectification circuit, be connected on rectification circuit two outputs and with direct current be converted to high-frequency alternating current oscillating circuit, be attempted by the filtering capacitor C on two power inputs of oscillating circuit, and the power output circuit that joins with oscillating circuit; Be serially connected with the high frequency power switch that is used to start oscillating circuit in the power supply circuits between described rectification circuit and oscillating circuit, it is characterized in that: also comprise the voltage on line side feedback unit that the magnitude of voltage to described alternating current Ui or direct current Ud detects in real time, the output dc voltage feedback unit that magnitude of voltage on the filtering capacitor C is detected in real time, be used to regulate the switching regulaor of described power switch duty ratio, and according to the corresponding PWM comparator that switching regulaor is controlled with output dc voltage feedback unit institute detection signal of described voltage on line side feedback unit.
Also comprise multiplier, described voltage on line side feedback unit and output dc voltage feedback unit meet two input u of multiplier respectively
N1And u
N2, the output u of multiplier
N0Connect the switch adjustment end of switching regulaor.
The output signal of described output dc voltage feedback unit is transported to the input u of multiplier after amplification treatment circuit amplifies
N2
Described amplification treatment circuit is an operational amplifier A 1.
Described voltage on line side feedback unit is the input direct voltage feedback unit that detects direct current Ud magnitude of voltage in real time.
Described input direct voltage feedback unit is made up of the resistance R 1 and the R2 of two serial connections; The cathode output end of described rectification circuit divides two-way after resistance R 1, the one tunnel after resistance R 2 ground connection, another road meets the input u of multiplier
N1
Described output dc voltage feedback unit is made up of the resistance R 5 and the R6 of two serial connections; The forward voltage output of described filtering capacitor C divides two-way after resistance R 5, the one tunnel after resistance R 6 ground connection, another road meets the input u of multiplier behind described amplification treatment circuit
N2
Described filter circuit is the RFI traffic filter.
The utility model compared with prior art has the following advantages, 1, simple in structure, volume is little, and uses easy and simple to handle, dependable performance.2, " dicyclo control " mode that adopts voltage on line side feedback unit and output dc voltage feedback unit to form, wherein the voltage on line side feedback unit is a ring in the control, its effect is when the voltage U d after the rectification circuit rectification (coming down to input voltage Ui) changes, promptly detect in real time and institute's detection signal is sent into multiplier by the voltage on line side feedback unit, remove to control the HF switch adjuster by pulse-width modulation (being the PWM comparator) at last, to regulate the HF switch adjuster is the duty ratio of power switch component, and reaching stationary filtering capacitor C both end voltage Uc is the purpose of filtering voltage Uc; The output dc voltage feedback unit is the control outer shroud, its effect is when filtering voltage Uc changes for a certain reason, the output dc voltage feedback unit promptly detects in real time, and carry out sending into multiplier after error is amplified through amplification treatment circuit, also remove to control the HF switch adjuster at last by pulse-width modulation (being the PWM comparator), to regulate the duty ratio of power switch component, reach the purpose of stationary filtering voltage U c.To sum up, because the utility model makes this ballast have the performance of fast transient response and high static voltage stability, therefore owing to adopted the dicyclo control mode, enlarge input voltage range, and improved the crest ratio of electrodeless lamp operating current significantly.3, switching regulaor also makes input current closely follow input voltage and changes when regulating the power duty cycle of switching, and promptly electric current also approaches sine wave, makes power factor 〉=0.98, and final total harmonic distortion greatly reduces.In sum, the utility model is reasonable in design, reliability is high and it is easy and simple to handle to use, and can effectively solve the steady operation problem of electrodeless lamp.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Description of reference numerals:
The 1-RFI traffic filter; The 2-rectification circuit; The 3-switching regulaor;
The 4-PWM comparator; The 5-oscillating circuit; The 6-multiplier;
The 7-power output circuit.
Embodiment
As shown in Figure 1, the utility model comprise the filter circuit that joins with AC power, with the input AC electricity Ui of institute be converted to direct current Ud rectification circuit 2, be connected on 2 liang of outputs of rectification circuit and with direct current be converted to high-frequency alternating current oscillating circuit 5, be attempted by the filtering capacitor C on 5 two power inputs of oscillating circuit, and the power output circuit 7 that joins with oscillating circuit 5.Be serially connected with the power switch that is used to start oscillating circuit 5 in the power supply circuits that described rectification circuit 2 and oscillating circuit are 5.In addition, the output dc voltage feedback unit that also comprises voltage on line side feedback unit that the magnitude of voltage to described alternating current Ui or direct current Ud detects in real time, the magnitude of voltage on the filtering capacitor C is detected in real time, the switching regulaor 3 that is used to regulate described power switch duty ratio, and according to the corresponding PWM comparator 4 that switching regulaor 3 is controlled with output dc voltage feedback unit institute detection signal of described voltage on line side feedback unit.Wherein, described filter circuit is RFI traffic filter 1 (being the Radio Frequency Interfere filter).
Also comprise multiplier 6, described voltage on line side feedback unit and output dc voltage feedback unit meet two input u of multiplier 6 respectively
N1And u
N2, the output u of multiplier 6
N0Connect the switch adjustment end of switching regulaor 3.
In the present embodiment, described voltage on line side feedback unit is the input direct voltage feedback unit that detects direct current Ud magnitude of voltage in real time.The output signal of described output dc voltage feedback unit is transported to the input u of multiplier 6 after amplification treatment circuit amplifies
N2
Described input direct voltage feedback unit is made up of the resistance R 1 and the R2 of two serial connections; The cathode output end of described rectification circuit 2 divides two-way after resistance R 1, the one tunnel after resistance R 2 ground connection, another road meets the input u of multiplier 6
N1Described output dc voltage feedback unit is made up of the resistance R 5 and the R6 of two serial connections.The forward voltage output of described filtering capacitor C divides two-way after resistance R 5, the one tunnel after resistance R 6 ground connection, another road meets the input u of multiplier 6 behind described amplification treatment circuit
N2, and described amplification treatment circuit is an operational amplifier A 1.Specifically: the forward voltage output of described filtering capacitor C connects the negative-phase input of described operational amplifier A 1 after resistance R 4, the normal phase input end of described operational amplifier A 1 is through power supply u
RefBack ground connection is connected to a resistance R 3 between the negative-phase input of described operational amplifier A 1 and its output, the input u of the output termination multiplier 6 of described operational amplifier A 1
N2
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection range of technical solutions of the utility model according to the utility model technical spirit.
Claims (7)
1. pulse-width modulation electric ballast, comprise the filter circuit that joins with AC power, with the input AC electricity Ui of institute be converted to direct current Ud rectification circuit (2), be connected on rectification circuit (2) two outputs and with direct current be converted to high-frequency alternating current oscillating circuit (5), be attempted by the filtering capacitor C on (5) two power inputs of oscillating circuit, and the power output circuit (7) that joins with oscillating circuit (5); Be serially connected with the power switch that is used to start oscillating circuit (5) in the power supply circuits between described rectification circuit (2) and oscillating circuit (5), it is characterized in that: also comprise the voltage on line side feedback unit that the magnitude of voltage to described alternating current Ui or direct current Ud detects in real time, the output dc voltage feedback unit that magnitude of voltage on the filtering capacitor C is detected in real time, be used to regulate the switching regulaor (3) of described power switch duty ratio, and according to the corresponding PWM comparator (4) that switching regulaor (3) is controlled with output dc voltage feedback unit institute detection signal of described voltage on line side feedback unit.
2. according to the described pulse-width modulation electric ballast of claim 1, it is characterized in that: also comprise multiplier (6), described voltage on line side feedback unit and output dc voltage feedback unit meet two input u of multiplier (6) respectively
N1And u
N2, the output u of multiplier (6)
N0Connect the switch adjustment end of switching regulaor (3).
3. according to the described pulse-width modulation electric ballast of claim 2, it is characterized in that: the output signal of described output dc voltage feedback unit is transported to the input u of multiplier (6) after amplification treatment circuit amplifies
N2
4. according to the described pulse-width modulation electric ballast of claim 3, it is characterized in that: described amplification treatment circuit is an operational amplifier A 1.
5. according to claim 3 or 4 described pulse-width modulation electric ballasts, it is characterized in that: described voltage on line side feedback unit is for detecting the input direct voltage feedback unit of direct current Ud magnitude of voltage in real time.
6. according to the described pulse-width modulation electric ballast of claim 5, it is characterized in that: described input direct voltage feedback unit is made up of the resistance R 1 and the R2 of two serial connections; The cathode output end of described rectification circuit (2) divides two-way after resistance R 1, the one tunnel after resistance R 2 ground connection, another road meets the input u of multiplier (6)
N1
Described output dc voltage feedback unit is made up of the resistance R 5 and the R6 of two serial connections; The forward voltage output of described filtering capacitor C divides two-way after resistance R 5, the one tunnel after resistance R 6 ground connection, another road meets the input u of multiplier (6) behind described amplification treatment circuit
N2
7. according to the described pulse-width modulation electric ballast of arbitrary claim in the claim 1 to 4, it is characterized in that: described filter circuit is RFI traffic filter (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920032151XU CN201369866Y (en) | 2009-03-10 | 2009-03-10 | Pulse width modulation electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920032151XU CN201369866Y (en) | 2009-03-10 | 2009-03-10 | Pulse width modulation electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201369866Y true CN201369866Y (en) | 2009-12-23 |
Family
ID=41488748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200920032151XU Expired - Fee Related CN201369866Y (en) | 2009-03-10 | 2009-03-10 | Pulse width modulation electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201369866Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131334A (en) * | 2011-04-15 | 2011-07-20 | 苏州市纽克斯照明有限公司 | System and method for controlling lighting current of electronic ballast |
-
2009
- 2009-03-10 CN CNU200920032151XU patent/CN201369866Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131334A (en) * | 2011-04-15 | 2011-07-20 | 苏州市纽克斯照明有限公司 | System and method for controlling lighting current of electronic ballast |
| CN102131334B (en) * | 2011-04-15 | 2014-04-16 | 苏州市纽克斯照明有限公司 | System and method for controlling lighting current of electronic ballast |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20110310 |