CN201758480U - Electronic ballast with overvoltage clamping protection function - Google Patents

Electronic ballast with overvoltage clamping protection function Download PDF

Info

Publication number
CN201758480U
CN201758480U CN2010205114504U CN201020511450U CN201758480U CN 201758480 U CN201758480 U CN 201758480U CN 2010205114504 U CN2010205114504 U CN 2010205114504U CN 201020511450 U CN201020511450 U CN 201020511450U CN 201758480 U CN201758480 U CN 201758480U
Authority
CN
China
Prior art keywords
circuit
voltage
electrically coupled
inductor
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2010205114504U
Other languages
Chinese (zh)
Inventor
胡进
徐清
邬权松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Dabang Technology Co.,Ltd.
Original Assignee
HANGZHOU DABANG TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HANGZHOU DABANG TECHNOLOGY Co Ltd filed Critical HANGZHOU DABANG TECHNOLOGY Co Ltd
Priority to CN2010205114504U priority Critical patent/CN201758480U/en
Application granted granted Critical
Publication of CN201758480U publication Critical patent/CN201758480U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)

Abstract

The utility model provides an electronic ballast with an overvoltage clamping protection function. The overvoltage protection is achieved by the clamping and the voltage across a coupled inductor which is magnetically coupled with a resonant inductor. The electronic ballast is rapid in voltage protection response speed, high in safety factor, easy in wiring and strong in anti-interference ability.

Description

A kind of electric ballast with over-voltage clamping defencive function
Technical field
The utility model relates to a kind of electric ballast, relates in particular to a kind of electric ballast with over-voltage clamping defencive function.
Background technology
Gaseous discharge lamp as fluorescent lamp, high-pressure sodium lamp, metal halide lamp etc., needs electric ballast that AC drive voltage is provided so that its operate as normal usually.Usually, electric ballast as power supply, is a direct current input voltage with ac grid voltage or the dc-battery voltage transitions that receives with electrical network or battery, by inverter circuit this DC input voitage is converted to required AC drive voltage again.
The driving voltage difference that gaseous discharge lamp needs at different working stages, it needs higher driving voltage (characteristic and the different of application scenario according to lamp are not waited to several ten thousand volts by several hectovolts), the operating voltage under stable state then lower (for example less than 200 volts) at ignition phase.The terminal voltage of gaseous discharge lamp can not be too high, in order to avoid cause the damage of lamp and other components and parts.Over-voltage protection method commonly used is the terminal voltage of sample gas discharge lamp and produces a voltage sampling signal.There is over-voltage condition if this voltage sampling signal greater than a preset value, then is judged as, and takes corresponding overvoltage protection measure, for example close inverter circuit.Because the time-delay that sample circuit and overvoltage crowbar cause adopts the electric ballast response speed of this method slow.In addition, this method needs high-voltage capacitor or high voltage resistor to sample, and the area of its printed circuit board (PCB) high-pressure section is big, and coefficient of safety is low, and the distance of the safe insulation between device is had higher requirements, and is unfavorable for the miniaturization of electric ballast.
The utility model content
The technical problems to be solved in the utility model provides the electric ballast that a kind of response speed is fast and coefficient of safety is high.
In order to solve the problems of the technologies described above, the utility model provides a kind of electric ballast with over-voltage clamping defencive function, comprising: voltage conversion circuit, and its output provides the DC input voitage that is conditioned; Inverter circuit comprises at least one switch, and its input is electrically coupled to the output of described voltage conversion circuit, and its output provides switching voltage; Resonant circuit, its input is electrically coupled to the output of described inverter circuit, its output provides AC drive voltage with gas discharge lamp, described resonant circuit comprises first capacitor, second capacitor and first inductor, wherein said first capacitor and the described first inductor coupled in series are to described gaseous discharge lamp, and described second capacitor is in parallel with described gaseous discharge lamp; Control circuit, its output is electrically coupled to the gate pole of described at least one switch, the conducting and the shutoff of described at least one switch of control; Second inductor is with the described first inductor magnetic coupling; And clamp circuit, be connected in parallel to described second inductor, with the voltage limit at the described second inductor two ends to being less than or equal to a threshold value.
According to embodiment of the present utility model, described clamp circuit comprises that first transient voltage suppresses diode and second transient voltage suppresses diode, described first transient voltage suppresses diode is in the same place with the anode electric coupling that second transient voltage suppresses diode, and negative electrode is electrically coupled to the two ends of described second inductor respectively.
According to embodiment of the present utility model, described clamp circuit also comprises a resistor, suppresses diode with described first transient voltage inhibition diode and second transient voltage and connects.
According to embodiment of the present utility model, described clamp circuit comprises: rectification circuit, its input are electrically coupled to described second inductor, and its output is electrically coupled to a direct current bus.
According to embodiment of the present utility model, the output of described rectification circuit is electrically coupled to the output of described voltage conversion circuit.
According to embodiment of the present utility model, described rectification circuit is full bridge rectifier or full-wave rectifying circuit.
According to embodiment of the present utility model, described clamp circuit also comprises a resistor, connects with described rectification circuit.
According to embodiment of the present utility model, described electric ballast also comprises: current sampling circuit, its input are electrically coupled to the input current of described inverter circuit with the described inverter circuit of sampling, and its output provides the current sampling signal relevant with this electric current; Wherein said control circuit comprises: error amplifier, and its in-phase input end receives reference voltage, and its inverting input is electrically coupled to described current sampling circuit to receive described current sampling signal; And voltage controlled oscillator, an one input is electrically coupled to the output of described error amplifier, and its output provides control signal to regulate the switching frequency of described at least one switch.
According to embodiment of the present utility model, described control circuit also comprises: frequency sweep circuit, its output are electrically coupled to another input of described voltage controlled oscillator, to regulate described control signal at ignition phase described switching frequency are changed from high to low.
The utility model adopts the circuit of said structure; voltage by clamper and the magnetic-coupled coupling inductor of resonant inductor two ends is realized overvoltage protection; need not high-voltage capacitor or resistor is sampled; its overvoltage protection response speed is fast; and the area of the printed circuit board (PCB) high-pressure section of electric ballast is little, coefficient of safety is high, wiring is easy, and antijamming capability is strong.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is further described:
Fig. 1 is the block diagram of the utility model electric ballast;
Fig. 2 is the circuit diagram of first execution mode of the utility model electric ballast;
Fig. 3 is the circuit diagram of second execution mode of the utility model electric ballast;
Fig. 4 is the circuit diagram of the 3rd execution mode of the utility model electric ballast.
Embodiment
To describe specific embodiment of the utility model in detail below, should be noted that the embodiments described herein only is used to illustrate, be not limited to the utility model.
Fig. 1 is the block diagram of the utility model electric ballast, comprises voltage conversion circuit 101, inverter circuit 102, resonant circuit 103 and over-voltage clamping protective device, and wherein the over-voltage clamping protective device comprises coupling inductor L CoupleWith clamp circuit 104.Voltage conversion circuit 101 receives interchange or the DC input voitage V that comes from electrical network or battery In, and be converted into DC input voitage V Dc Voltage conversion circuit 101 can comprise or wherein several combinations in rectifier bridge, DC circuit, the ac/dc translation circuit.Inverter circuit 102 is electrically coupled to voltage conversion circuit 101, comprises at least one switch, the conducting by this at least one switch with turn-off DC input voitage V DcBe converted to switching voltage V SwInverter circuit 102 can adopt any AC/DC transformation topology structure, for example full-bridge topologies, half-bridge topology etc.Control circuit 105 is electrically coupled to inverter circuit 102, the wherein conducting and the shutoff of at least one switch of control.
Resonant circuit 103 electric couplings are between inverter circuit 102 and gaseous discharge lamp, with switching voltage V SwBe converted to AC drive voltage V OutWith gas discharge lamp.Resonant circuit 103 comprises series capacitor C s, inductor L and shunt capacitor C pSeries capacitor C sWith inductor L and gaseous discharge lamp coupled in series, shunt capacitor C pIn parallel with gaseous discharge lamp.In Fig. 1, series capacitor C sBe connected in series between the end of output of inverter circuit 102 and inductor L shunt capacitor C pAnd lamp is connected in parallel between another output of the other end of inductor L and inverter circuit.But those skilled in the art as can be known, series capacitor C s, inductor L and shunt capacitor C pBetween also can adopt other connected modes.
Coupling inductor L CoupleWith inductor L magnetic coupling.Coupling inductor L CoupleBe proportionate relationship with the voltage at inductor L two ends, this proportionate relationship is by the number of turns decision of the two.Clamp circuit 105 is connected in parallel to coupling inductor L Couple, with coupling inductor L CoupleVoltage clamp to the one threshold value V at two ends Th, that is, make this voltage limit to being less than or equal to threshold value V ThCoupling inductor L CoupleThe voltage clamp threshold value V at two ends ThParameter, coupling inductor L with the composition device of the structure of clamp circuit 104, clamp circuit 104 CoupleRelevant with the turn ratio of inductor L etc., generally can and require determine through test of many times according to the real protection design.
Because series capacitor C s, shunt capacitor C pL is in resonance condition with inductor, and when the amplitude of inductor L both end voltage also increases, the amplitude of voltage of both ends of lamp increases, and vice versa.Thereby by clamper coupling inductor L CoupleThe voltage at two ends, but the voltage at clamper inductor L two ends, thus make the voltage at lamp two ends obtain restriction.The utility model need not high-voltage capacitor or resistor is sampled, thereby the overvoltage protection response is fast, and the area of the printed circuit board (PCB) high-pressure section of electric ballast is little, coefficient of safety is high, and wiring is easy, and antijamming capability is strong.
Voltage conversion circuit 101 all no longer is shown in the circuit diagram of each execution mode for simplicity.Fig. 2 is the circuit diagram of first execution mode of the utility model electric ballast, and wherein inverter circuit 202 adopts half-bridge topology, comprises the switch S 1 and the S2 that are connected in series.Clamp circuit 204 comprises TVS (transient voltage suppresses, Transient Voltage Suppressor) diode D1 and the D2 that connects back-to-back.The anode electric coupling of TVS diode D1 and D2 is in the same place, and negative electrode is electrically coupled to the two ends of the described second inductor L respectively.
The TVS diode is a kind of high-effect protection device of diode form.When the two poles of the earth of TVS diode were subjected to reverse transient state high energy impact events, it can be with 10 -12The speed of second-time becomes Low ESR with the high impedance of its two interpolar, absorbs the surge power up to thousands of watts, and the voltage clamp that makes two interpolars is protected the precision components in the electronic circuit effectively in a predetermined value, avoids the damage of various surge pulses.The TVS diode has advantages such as fast, transient power of response time is big, clamping voltage is more easy to control, do not have the limit of damage, volume is little.
Among Fig. 2,, cause coupling inductor L if electric ballast generation overvoltage increases the voltage at inductor L two ends suddenly CoupleThe voltage at two ends also increases suddenly.Since the effect of ZVS diode D1 and D2, coupling inductor L CoupleThe voltage at two ends is clamped to the puncture voltage and conducting voltage (comparing the former can ignore) sum of ZVS diode rapidly, thereby the voltage at inductance L two ends is all protected electric ballast and gaseous discharge lamp also by clamper fast.
Electric ballast shown in Figure 2 adopts the input Average Current Control based on the switching frequency modulation.Current sampling circuit 206 comprises the sampling resistor R that is connected electrically between switch S 2 and the ground SenseAnd the filter circuit of forming by resistor and capacitor.The current sampling signal I of current sampling circuit 206 outputs SenseThe mean value of inductor L electric current is flow through in representative.
Control circuit 205 comprises error amplifier ERR_AMP and voltage controlled oscillator 207.The in-phase input end of error amplifier ERR_AMP receives reference voltage Ref, and inverting input is electrically connected to current sampling circuit 206 with received current sampled signal I Sense, the output signal COMP that affords redress.Voltage controlled oscillator 207 is electrically coupled to the output of error amplifier ERR_AMP, regulates the frequency of the control signal CTRL of its output according to compensating signal COMP.The duty ratio of this control signal CTRL is generally 50%.The gate pole of switch S 1 is electrically coupled to voltage controlled oscillator 207 to receive control signal CTRL.The input of not gate NOT1 is electrically coupled to voltage controlled oscillator 207 to receive control signal CTRL, and output is electrically coupled to the gate pole of switch S 2.
In one embodiment, electric ballast sampling resonant ignition mode shown in Figure 2, control circuit 205 also comprises frequency sweep circuit 208.Frequency sweep circuit 208 is electrically coupled to voltage controlled oscillator 207, regulates control signal CTRL at ignition phase the switching frequency of switch S 1 and S2 is reduced gradually from a high value (greater than the resonance frequency of resonant circuit), thereby produce high voltage so that it is lighted at the lamp two ends.
In order to limit the electric current that flows through ZVS diode D1 and D2, the resistor of can in the loop that these two ZVS diodes constitute, connecting.
Fig. 3 is the circuit diagram of second execution mode of the utility model electric ballast, and wherein inverter circuit 302 also adopts half-bridge topology.Clamp circuit 304 comprises the full bridge rectifier of being made up of diode D3～D6.The input of this full bridge rectifier is electrically coupled to coupling inductor L CoupleTwo ends, output is electrically coupled to a direct current bus.This dc bus can provide substantially constant constant direct voltage.This dc bus can come from electric ballast inside, is for example provided by the output of voltage conversion circuit or the accessory power supply of electric ballast, also may come from the electric ballast outside.
Among Fig. 3,, cause coupling inductor L if electric ballast generation overvoltage increases the voltage at inductor L two ends suddenly CoupleThe voltage at two ends also increases suddenly.Since the effect of the full bridge rectifier that diode D3～D6 forms, coupling inductor L CoupleThe voltage at two ends is clamped to diode turn-on voltage (comparing the former can the ignore) sum of direct voltage and twice on the dc bus, thereby the voltage at inductance L two ends is all protected electric ballast and gaseous discharge lamp also by clamper fully.
Fig. 4 is the circuit diagram of the 3rd execution mode of the utility model electric ballast, and wherein clamp circuit 304 comprises the full-wave rectifying circuit of being made up of diode D7 and D8.The input of this full-wave rectifying circuit is electrically coupled to coupling inductor L CoupleTwo ends, output is electrically coupled to the output of voltage conversion circuit, i.e. the input of inverter circuit 402.
Among Fig. 4,, cause coupling inductor L if electric ballast generation overvoltage increases the voltage at inductor L two ends suddenly CoupleThe voltage at two ends also increases suddenly.Since the effect of the full-wave rectifying circuit that diode D7 and D8 form, coupling inductor L CoupleThe voltage at two ends is clamped to DC input voitage V eventually DcWith diode turn-on voltage (comparing the former can ignore) sum, thus the voltage at inductance L two ends also by clamper, resonant energy is fed back to dc bus, and electric ballast and gaseous discharge lamp are all protected fast.
Fig. 3 and electric ballast shown in Figure 4 also can use voltage-controlled mode same as shown in Figure 2 and frequency sweep ignition method.In addition, in order to limit the electric current that flows through rectification circuit among Fig. 3 and Fig. 4, also a resistor in series can be connected to this rectification circuit.
Though described the utility model with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from utility model because the utility model can specifically be implemented in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.

Claims (9)

1. electric ballast with over-voltage clamping defencive function comprises:
Voltage conversion circuit, its output provides the DC input voitage that is conditioned;
Inverter circuit comprises at least one switch, and its input is electrically coupled to the output of described voltage conversion circuit, and its output provides switching voltage;
Resonant circuit, its input is electrically coupled to the output of described inverter circuit, its output provides AC drive voltage with gas discharge lamp, described resonant circuit comprises first capacitor, second capacitor and first inductor, wherein said first capacitor and the described first inductor coupled in series are to described gaseous discharge lamp, and described second capacitor is in parallel with described gaseous discharge lamp;
Control circuit, its output is electrically coupled to the gate pole of described at least one switch, the conducting and the shutoff of described at least one switch of control;
Second inductor is with the described first inductor magnetic coupling; And
Clamp circuit is connected in parallel to described second inductor, with the voltage limit at the described second inductor two ends to being less than or equal to a threshold value.
2. electric ballast as claimed in claim 1, wherein said clamp circuit comprises that first transient voltage suppresses diode and second transient voltage suppresses diode, described first transient voltage suppresses diode is in the same place with the anode electric coupling that second transient voltage suppresses diode, and negative electrode is electrically coupled to the two ends of described second inductor respectively.
3. electric ballast as claimed in claim 2, wherein said clamp circuit also comprises a resistor, suppresses diode with described first transient voltage inhibition diode and second transient voltage and connects.
4. electric ballast as claimed in claim 1, wherein said clamp circuit comprises:
Rectification circuit, its input are electrically coupled to described second inductor, and its output is electrically coupled to a direct current bus.
5. electric ballast as claimed in claim 4, the output of wherein said rectification circuit is electrically coupled to the output of described voltage conversion circuit.
6. electric ballast as claimed in claim 5, wherein said rectification circuit are full bridge rectifier or full-wave rectifying circuit.
7. electric ballast as claimed in claim 5, wherein said clamp circuit also comprises a resistor, connects with described rectification circuit.
8. as each described electric ballast in the claim 1 to 7, also comprise:
Current sampling circuit, its input are electrically coupled to the input current of described inverter circuit with the described inverter circuit of sampling, and its output provides the current sampling signal relevant with this electric current;
Wherein said control circuit comprises:
Error amplifier, its in-phase input end receives reference voltage, and its inverting input is electrically coupled to described current sampling circuit to receive described current sampling signal; And
Voltage controlled oscillator, an one input is electrically coupled to the output of described error amplifier, and its output provides control signal to regulate the switching frequency of described at least one switch.
9. electric ballast as claimed in claim 8, wherein said control circuit also comprises:
Frequency sweep circuit, its output are electrically coupled to another input of described voltage controlled oscillator, to regulate described control signal at ignition phase described switching frequency are changed from high to low.
CN2010205114504U 2010-08-27 2010-08-27 Electronic ballast with overvoltage clamping protection function Expired - Fee Related CN201758480U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010205114504U CN201758480U (en) 2010-08-27 2010-08-27 Electronic ballast with overvoltage clamping protection function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010205114504U CN201758480U (en) 2010-08-27 2010-08-27 Electronic ballast with overvoltage clamping protection function

Publications (1)

Publication Number Publication Date
CN201758480U true CN201758480U (en) 2011-03-09

Family

ID=43645768

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010205114504U Expired - Fee Related CN201758480U (en) 2010-08-27 2010-08-27 Electronic ballast with overvoltage clamping protection function

Country Status (1)

Country Link
CN (1) CN201758480U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101909396A (en) * 2010-08-27 2010-12-08 杭州大邦科技有限公司 Electronic ballast and over-voltage clamping protection method thereof
CN111025075A (en) * 2020-01-14 2020-04-17 浙江吉利汽车研究院有限公司 Electromagnetic disturbance test system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101909396A (en) * 2010-08-27 2010-12-08 杭州大邦科技有限公司 Electronic ballast and over-voltage clamping protection method thereof
CN101909396B (en) * 2010-08-27 2013-04-17 浙江大邦科技有限公司 Electronic ballast and over-voltage clamping protection method thereof
CN111025075A (en) * 2020-01-14 2020-04-17 浙江吉利汽车研究院有限公司 Electromagnetic disturbance test system

Similar Documents

Publication Publication Date Title
CN103427656B (en) A kind of crisscross parallel inverse-excitation type LED drive power and PFM control circuit thereof
CN102263515B (en) AC-DC (alternating current-direct current) power conversion chip and power conversion circuit
CN102969927A (en) Step-down switching power supply and control method thereof
CN101827488B (en) Fluorescent lamp electronic ballast and lighting device
CN105375777A (en) Constant voltage output circuit, flyback switching power supply and electronic device thereof
CN101868105B (en) Electronic ballast and overvoltage protection method thereof
CN201418184Y (en) Constant-current driving power for high-power LED
CN109560708A (en) A kind of CNC high-pressure direct current generating device and method
CN101635523A (en) External mining intrinsic safety power supply
CN104426377B (en) Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor
CN110221645B (en) Ripple current generating circuit
CN201758480U (en) Electronic ballast with overvoltage clamping protection function
CN102781147B (en) LED (Light-emitting diode) power supply circuit with high power factor
CN102810986B (en) A kind of series topology LED switch power circuit
CN203206143U (en) Step-down switching power supply
CN101909396B (en) Electronic ballast and over-voltage clamping protection method thereof
CN102946186A (en) Active harmonic suppressing mechanism
CN203435182U (en) Staggered parallel flyback LED driving power supply and PFM control circuit thereof
CN211019356U (en) APFC switching power supply
CN204795770U (en) Low ripple LED drive power supply's of no electrolytic capacitor intelligent digital control circuit
CN112542818B (en) Input undervoltage protection circuit and power panel comprising same
CN203457054U (en) Wide input voltage flyback switching power supply suitable for DC motor driving
CN106411160A (en) Switching power supply
CN216252528U (en) Circuit capable of effectively improving lightning stroke resistance effect of LED driving power supply
CN201700073U (en) Electronic ballast with function of overvoltage protection

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: ZHEJIANG DABONG TECHNOLOGY CO., LTD.

Free format text: FORMER NAME: HANGZHOU DABONG TECHNOLOGY CO., LTD.

CP03 Change of name, title or address

Address after: Hangzhou City, Zhejiang province 311100 Yuhang District Canal Town Road No. 3 Building 2 pole

Patentee after: Zhejiang Dabang Technology Co.,Ltd.

Address before: 311100, No. 37 East Street, East Lake street, Yuhang District, Zhejiang, Hangzhou

Patentee before: Hangzhou Dabang Technology Co., Ltd.

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110309

Termination date: 20170827