CN101854766B - Electrodeless lamp power circuit, and protection method and protective circuit thereof - Google Patents
Electrodeless lamp power circuit, and protection method and protective circuit thereof Download PDFInfo
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Abstract
The invention provides an electrodeless lamp power circuit, and a protection method and a protective circuit thereof. The protection method comprises the following steps: power frequency input voltage and resonant inductance voltage of the electrodeless lamp power circuit are detected; if the power frequency input voltage is overvoltage, the input switch, the first cascade switch, and the second cascade switch are shut off; and if the resonant inductance voltage is overvoltage, the input switch, the first cascade switch and the second cascade switch are shut off, and the grid and the source of the switching tube in the resonant transformation circuit are short-circuited to shut off the resonant switch. The protection method effectively protects circuits of electrodeless lamp power at all levels under abnormal conditions, especially the half-bridge transformation circuit.
Description
Technical field
The present invention relates to electrodeless lamp power circuit design and manufacture technology and power protection field, particularly a kind of electrodeless lamp power circuit, and guard method and protective circuit.
Background technology
Electrodeless lamp power supply claims again electric ballast, and the alternating current of high frequency is provided for Non-polarized lamp, to excite and to keep gas discharge, is the important component part of Non-polarized lamp.The working mechanism of electrodeless lamp power supply is: the commercial power rectification of input is become direct current, produce high frequency square wave voltage by semi-bridge inversion, send into resonant network and carry out filtering, obtain Non-polarized lamp and start and the required high-frequency alternating current that works.As third generation light source, Non-polarized lamp is to have very long useful life (under the normal environment for use approximately 40000-60000 hour) compared to one of marked improvement feature of incandescent lamp and fluorescent lamp.In actual applications, because operational environment relative complex, there is the complicated electromagnetic environment such as thunderbolt, line internal overvoltage in outdoor and industrial and mineral application scenario, switch mosfet device in electrodeless lamp power supply, especially the power inverter link becomes easy impaired link and restriction Non-polarized lamp at this class complex electromagnetic environment short slab in lower useful life.Therefore, in the design process of electrodeless lamp power supply, introduce effective protective circuit, particularly for the protective circuit of switching device, tool is of great significance.
The main low pressure gaseous discharge Non-polarized lamp of using has mainly adopted the operating frequency of 2.65MHz at present, and namely the switching frequency of power supply is 2.65MHz, and normal operation switch mosfet device carries out high-frequency inversion.Under so high switching frequency, the loss meeting of device is larger, junction temperature is higher, in case input overvoltage or output short circuit (comprising power output terminal short circuit, lamp gas leakage or transmission line short circuit etc.) occur, will in the MOSFET device, produce overvoltage or overcurrent, cause device breakdown to be burnt.Therefore, to power supply, in the process that particularly switching device is protected, should effectively protect for the overvoltage of input generation and two kinds of situations of overcurrent of output generation.
Utility model patent " electrodeless lamp power circuit " (application number: 200820042954.9, the applying date: 2008-01-12), as shown in Figure 1, be the electrodeless lamp power supply protective circuit schematic diagram of prior art, its circuit output end connects electrodeless lamp coupler.Form resonant capacitances by two capacitances in series, and draw abnormal protection sampled voltage in the middle of the two at this, the dividing potential drop by two other electric capacity obtains double sampling voltage, and double sampling voltage becomes control voltage after rectification.Form delay circuit by a resistance and an electric capacity, the direct voltage that control voltage is risen in time by capacitive means.When direct voltage during greater than the voltage stabilizing value of voltage-stabiliser tube, voltage-stabiliser tube is breakdown, and direct current triggers controlled silicon conducting, by No. 5 pin ground connection of blocking diode with control single chip computer.After No. 5 pins that detect single-chip microcomputer were grounded, single-chip microcomputer sent signal by No. 7 pins to thyristor control circuit, and thyristor control circuit, quits work so that half-bridge inversion circuit is in cut-off state by pin.Under normal condition, voltage does not also rise to the voltage stabilizing value of voltage-stabiliser tube, lamp has just been lighted, lamp is lighted the just off resonance of rear resonant circuit, thereby voltage-stabiliser tube and controllable silicon are in cut-off state always, No. 5 pin is in high-impedance state, and No. 7 pin sends the driving signal to thyristor control circuit, so that two switching tubes are in running order in the circuit.Described protective circuit is carried out action control by the voltage that gathers resonant capacitance, during only for output circuit is protected, and is not had control action when input produced overvoltage, and therefore, its protective capability is limited.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, has proposed especially a kind of electrodeless lamp power circuit, and guard method and protective circuit.
For achieving the above object, one aspect of the present invention has proposed a kind of electrodeless lamp power circuit, comprising: input; The input switch that links to each other with described input; The filter circuit that links to each other with described input switch is used for power filter and surge absoption; The rectification circuit that links to each other with described filter circuit is used for the filtered power frequency input voltage of described filter circuit is carried out rectification and power factor correction, obtains direct current; The resonant transform circuit that links to each other with described rectification circuit, be used for direct current that described rectification circuit is produced just inversion and after the filtering frequency-selecting, offer Non-polarized lamp obtaining high frequency square wave; And be connected to the first cascaded switch between described filter circuit and the described rectification circuit; and be connected to the second cascaded switch between described rectification circuit and the described resonant transform circuit; wherein; described input switch, described the first cascaded switch and the second cascaded switch, and the switching tube in the described resonant transform circuit is controlled by power protecting circuit.
The present invention has also proposed a kind of electrodeless lamp power circuit guard method on the other hand, may further comprise the steps: the power frequency input voltage and the resonance inductive drop that detect described electrodeless lamp power circuit; If described power frequency input voltage is overvoltage, then close described input switch, described the first cascaded switch and the second cascaded switch; If resonant inductance voltage is overvoltage, then close described input switch, described the first cascaded switch and the second cascaded switch, and with the switching tube grid source shorted in the described resonant transform circuit to close resonant switch.
The present invention has also proposed a kind of electrodeless lamp power supply protective circuit on the other hand, comprising: signal deteching circuit, for detection of power frequency input voltage and the resonance inductive drop of described electrodeless lamp power circuit; The front-end protection circuit, be used for described signal deteching circuit detect described power frequency input voltage and resonance inductive drop any during for overvoltage, close described input switch, described the first cascaded switch and the second cascaded switch; With rear terminal protecting circuit, be used for described signal deteching circuit detect described power frequency input voltage and resonance inductive drop any during for overvoltage, with the switching tube grid source shorted in the described resonant transform circuit to close resonant switch.
By the electrodeless lamp power supply guard method that the present invention proposes, realized under the abnormal conditions the effective protection to electrodeless lamp power supply circuit at different levels, particularly semi-bridge alternation circuit.
The aspect that the present invention adds and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the electrodeless lamp power supply protective circuit schematic diagram of prior art;
Fig. 2 is electrodeless lamp power circuit structural representation of the present invention;
Fig. 3 is the flow chart of invention electrodeless lamp power supply guard method embodiment;
Fig. 4 is that electrodeless lamp power supply protective circuit embodiment of the present invention forms structural representation;
Fig. 5 is the front-end protection circuit diagram of electrodeless lamp power supply protective circuit of the present invention;
Fig. 6 is the rear terminal protecting circuit schematic diagram of electrodeless lamp power supply protective circuit of the present invention;
Fig. 7 is the warning circuit schematic diagram of electrodeless lamp power supply protective circuit of the present invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
The present invention be directed to and how electrodeless lamp power supply is carried out safeguard measure, and a kind of electrodeless lamp power supply guard method and the protective circuit that propose.By the guard method that the present invention proposes, realized under the abnormal conditions the effective protection to electrodeless lamp power supply circuit at different levels, particularly semi-bridge alternation circuit.
As shown in Figure 2, be the electrodeless lamp power circuit structural representation of the embodiment of the invention.This electrodeless lamp power circuit comprises input, input switch S200, is used for the filter circuit 21 of power filter and surge absoption, carries out rectification and power factor correction through filter circuit 21 filtered power frequency electricity, obtains cascaded switch (the second cascaded switch) S202 between cascaded switch (the first cascaded switch) S201, resonant transform circuit 23 and rectification circuit 22 and the resonant transform circuit 23 between galvanic rectification circuit 22, filter circuit 21 and the rectification circuit 22.Direct current in resonant transform circuit 23 switching tube M201 and the half-bridge inverter inversion that forms of switching tube M202 after obtain high frequency square wave, be output as the Non-polarized lamp power supply from port 201 and 200 after the series resonant circuit filtering frequency-selecting that high frequency square wave forms by inductance L 201 and capacitor C 201.Capacitor C 202 is capacitance.Under the Non-polarized lamp normal operation, the introducing of lamp impedance is so that the resonant transform circuit off resonance is flow through the current stabilization of resonant inductance L201 in certain lsafety level.When bulb gas leakage is broken or 201 during with 202 short circuit, resonant transform circuit is in resonance condition, will be in the generation overvoltage of L201 two ends.
Based on the described electrodeless lamp power circuit structure of Fig. 2, the present invention proposes a kind of electrodeless lamp power supply guard method, it implements flow chart is shown in Figure 3, particularly, can be simultaneously referring to figs. 2 and 3, the method comprises following implementation step:
Detect described electrodeless lamp power supply power frequency input voltage and resonance inductive drop by signal deteching circuit 31.When if signal deteching circuit 31 detects described electrodeless lamp power supply power frequency input generation overvoltage; then overvoltage signal is sent to front-end protection circuit 32; 32 controls of front-end protection circuit disconnect input switch S200; cascaded switch S201 between filter circuit 21 and the rectification circuit 22; and the cascaded switch S202 between rectification circuit 22 and the resonant transform circuit 23; and startup warning device; simultaneously; front-end protection circuit 32 sends power frequency input overvoltage signal to rear terminal protecting circuit 33; the resonant switch of rear terminal protecting circuit 33 closing switch pipe M201 and switching tube M202, and with input 203 ground connection of resonant circuit.
After if signal deteching circuit 31 detects described electrodeless lamp power supply power frequency input overvoltage end, then the overvoltage disappearance of signal is sent to front-end protection circuit 32, the cascaded switch S201 between leading portion protective circuit 32 control coincidence input switch S200, filter circuit 21 and the rectification circuit 22 and the cascaded switch S202 between rectification circuit 22 and the resonant transform circuit 23; Front-end protection circuit 32 sends power frequency input overvoltage signal to rear terminal protecting circuit 33 simultaneously, and rear terminal protecting circuit 33 is opened resonant switch, and the input of resonant circuit is disconnected with ground, and cancellation is reported to the police.
When signal deteching circuit 31 detects resonant inductance generation overvoltage; then resonance overvoltage is sent to rear terminal protecting circuit 33; the resonant switch of rear terminal protecting circuit 33 closing switch pipe M201 and switching tube M202; and startup warning device; simultaneously; rear terminal protecting circuit 33 sends to leading portion protective circuit 32 to resonance overvoltage, the cascaded switch S201 between leading portion protective circuit 32 control disconnection input switch S200, filter circuit 21 and the rectification circuit 22 and the cascaded switch S202 between rectification circuit 22 and the resonant transform circuit 23.
In order more deep understanding to be arranged to this method, provide simultaneously a kind of electrodeless lamp power supply protective circuit in the embodiment of the invention.As shown in Figure 4, form structural representation for electrodeless lamp power supply protective circuit embodiment of the present invention.This circuit comprises transformer 41, front-end protection circuit 42, rear terminal protecting circuit 43 and warning circuit 44.In transformer 41, former limit winding 41a is used for the current signal of resonant circuit is passed to secondary winding 41b on the one hand as the resonant inductance of resonant transform circuit on the other hand, and 41b is used for to the back-end protective circuit 43 transmission resonance overvoltages.Front-end protection circuit 42; be used for receiving the overvoltage signal of power frequency input and the overvoltage signal of the resonant inductance that rear terminal protecting circuit sends; and when receiving one of them of above-mentioned two signals or receiving simultaneously above-mentioned two signals; disconnect immediately input and filter circuit 401; filter circuit 401 and rectification circuit 402; the cascaded switch S400 of rectification circuit 402 and inversion translation circuit 403; S401 and S402; and startup warning circuit 44; and terminal protecting circuit 43 after when receiving the overvoltage signal of power frequency input, sending a signal to; and after the overvoltage signal of power frequency input finishes, automatically open cascaded switch, cancellation is reported to the police.Rear terminal protecting circuit 43, the power frequency input that is used for 42 transmissions of receiving front-end protective circuit produces the overvoltage signal of the resonant inductance of superpotential signal or secondary winding 41b transmission, and when the overvoltage signal of the resonant inductance that receives secondary winding 41b transmission, the resonant switch of closing switch pipe M401 and M402 immediately, and send a signal to front-end protection circuit 42, start simultaneously warning circuit 44; And when the power frequency input that receives 42 transmissions of front-end protection circuit produces superpotential signal, with input 403 ground connection of half-bridge inversion circuit; And after the overvoltage signal of the resonant inductance that overvoltage signal or the secondary winding 41b of the power frequency input that front-end protection circuit 42 sends send finishes, automatically open the resonant switch of switching tube M401 and M402, cancellation is reported to the police.Warning circuit 44 is used for starting after the alarm signal that receives front-end protection circuit 42 and rear terminal protecting circuit 43 reports to the police.
In order to be illustrated more clearly in the function of front-end protection circuit among the present invention, front-end protection circuit among the present invention has been done detailed explanation, as shown in Figure 5, be the front-end protection circuit diagram of electrodeless lamp power supply protective circuit of the present invention.With reference to figure 4, wherein, port 500a connects No. 1 terminal of S401 switch, namely connects the output power-frequency voltage of filter circuit simultaneously.After divider resistance R501 and R502 dividing potential drop, send into the inverting input of voltage comparator (the first comparator) 501.The in-phase input end of voltage comparator 501 meets reference voltage (the first reference voltage) Ref1.When the in-phase input end voltage of voltage comparator 501 during greater than the anti-phase input terminal voltage, voltage comparator 501 output high level, when the in-phase input end voltage of voltage comparator 501 during less than the anti-phase input terminal voltage, voltage comparator 501 output low levels.For normal power-frequency voltage, Ref1 is set greater than voltage comparator 501 anti-phase input terminal voltages, voltage comparator 501 output high level.R503 is output current limiting resistance.Switch 503,504,505 (third level connection switch, fourth stage connection switch are connected switch with level V) connects respectively cascaded switch S400, S401 and the S402 of input and filter circuit, filter circuit and ballasting circuit, rectification circuit and resonant transform circuit.When its grid is high level, source electrode and drain electrode conducting, when its grid was low level, source electrode and drain electrode disconnected.The drain electrode 500b of switch (the 6th cascaded switch) 502 connects rear terminal protecting circuit; being used for to the back-end, protective circuit transmits control signal; when the grid of switch 502 is high level; 500b is high-impedance state; when the grid of switch 502 is low level; the drain electrode of switch 502 and source electrode are connected, i.e. 500b ground connection.Voltage comparator (the second comparator) the 506th, the voltage comparator identical with voltage comparator 501; its in-phase input end 500c connects rear terminal protecting circuit; the control signal of terminal protecting circuit after being used for receiving, anti-phase input termination reference voltage (the second reference voltage) Ref2.
Same, for the function of terminal protecting circuit after better understanding, below the structure of rear terminal protecting circuit is introduced.As shown in Figure 6, be the rear terminal protecting circuit schematic diagram of the invention described above electrodeless lamp power supply protective circuit.See in conjunction with Fig. 4, wherein, 600a connects the input of secondary winding 41b, sends into the in-phase input end of voltage comparator (the 3rd comparator) 601 after divider resistance R601 and R602 dividing potential drop.Anti-phase input termination reference voltage (the 3rd reference voltage) Ref3 of voltage comparator 601.When the in-phase input end voltage of voltage comparator 601 during greater than the anti-phase input terminal voltage, voltage comparator 601 output high level, when the in-phase input end voltage of voltage comparator 601 during less than the anti-phase input terminal voltage, voltage comparator 601 output low levels.For normal resonant inductance voltage, Ref3 is set greater than voltage comparator 601 in-phase input end voltages, voltage comparator 601 output low levels.Switch 603,604 (the 7th cascaded switch and the 8th cascaded switch) is respectively the grid source electrode control switch of resonant transform circuit switching device M401 and M402: 603a connects the grid of M401, and 603b connects the source electrode of M401; 604a connects the grid of M402, and 604b connects the source electrode of M402.When its grid is high level, source electrode and drain electrode conducting, when its grid was low level, source electrode and drain electrode disconnected.The drain electrode of switch (the 9th cascaded switch) 602 connects the 500c end, and be used for the forward end protective circuit and transmit control signal, when the grid of switch 602 is high level, its drain electrode and source electrode conducting, 500c ground connection; When the grid of switch 602 was low level, its drain electrode and source electrode disconnected, and 500c is high-impedance state.Voltage comparator (the 4th comparator) 605 is the voltage comparator identical with voltage comparator 601, and its anti-phase input termination 500b is used for the control signal of receiving front-end protective circuit, and in-phase input end meets reference voltage Ref4.Switching tube 606 is open-minded when grid is high level, turn-offs during low level, and its drain electrode 606b end is connected to the drain electrode of M401.
As shown in Figure 7, be the warning circuit schematic diagram of electrodeless lamp power supply protective circuit of the present invention.Wherein, 701 is alarm, when its terminal connects high level, gives the alarm.702 is the positive-negative-positive control switch, and its b utmost point connects the 500c end.When the b utmost point was high-impedance state, switching tube turn-offed, and namely c, e the two poles of the earth disconnect; When the b utmost point connects low level, switching tube conducting, i.e. c, the conducting of e the two poles of the earth.
In conjunction with Fig. 5, Fig. 6, Fig. 7, the function specific implementation of electrodeless lamp power supply protective circuit of the present invention comprises: when the power frequency input produces overvoltage, the R502 both end voltage becomes and is higher than the Ref1 reference voltage, voltage comparator 501 is exported by the high level saltus step to low level, switching tube 503,504,505 turn-offs simultaneously, and namely cascaded switch S400, S401, the S402 between the input among Fig. 4 and filter circuit, filter circuit and rectification circuit and rectification circuit and the resonant transform circuit disconnects simultaneously; Simultaneously; 501 output low levels cause switching tube 502 to be connected; 500b holds ground connection; voltage comparator 605 anti-phase input terminal voltages become and are lower than the Ref4 reference voltage; to high level, switching tube 606 is connected by low transition in 605 outputs, and 600b holds ground connection; be the M401 grounded drain, the semi-bridge alternation circuit is grounded protection.500b end ground connection causes 702 pipe conductings, and 701 produce alarm.
After power frequency input overvoltage finishes, the R502 both end voltage becomes and is lower than the Ref1 reference voltage, voltage comparator 501 is exported by low transition to high level, switching tube 503,504,505 is open-minded simultaneously, and namely cascaded switch S400, the S401 between the input among Fig. 4 and filter circuit, filter circuit and rectification circuit and rectification circuit and the resonant transform circuit, S402 are open-minded simultaneously; Simultaneously, 501 output high level cause switching tube 502 to turn-off, and the 500b end becomes high-impedance state, voltage comparator 605 anti-phase input terminal voltages become and are higher than the Ref4 reference voltage, to low level, switching tube 606 turn-offs by the high level saltus step in 605 outputs, i.e. M401 drain electrode disconnects with ground.The 500b end becomes high-impedance state with the ground disconnection and causes 702 pipes to turn-off, and 701 alarms finish.
When resonant inductance produced overvoltage, the R602 both end voltage became and is higher than the Ref3 reference voltage, and to high level, switching tube 603,604 is open-minded simultaneously by low transition in voltage comparator 601 outputs, and namely the grid source class of M401 and M402 is protected by short circuit simultaneously; Simultaneously, 601 output high level cause 602 switching tubes open-minded, 500c holds ground connection, cause 506 homophase input voltage to become and be lower than reference voltage Ref2,506 output by the high level saltus step to low level, cause switching tube 503,504,505 to turn-off simultaneously, namely cascaded switch S400, S401, the S402 between the input among Fig. 4 and filter circuit, filter circuit and rectification circuit and rectification circuit and the resonant transform circuit disconnects simultaneously; Simultaneously; 506 output low levels cause switching tube 502 to be connected; 500b holds ground connection; voltage comparator 605 anti-phase input terminal voltages are lower than the Ref4 reference voltage; to high level, switching tube 606 is connected by low transition in 605 outputs, and 600b holds ground connection; be the M401 grounded drain, the semi-bridge alternation circuit is grounded protection.500b end ground connection causes 702 pipe conductings, and 701 produce alarm.
Therefore; in electrodeless lamp power supply protective circuit embodiment of the present invention; when overvoltage appears in electrodeless lamp power supply power frequency input; after the front-end protection circuit obtains power frequency input overvoltage by signal deteching circuit; cascaded switch between electrodeless lamp power supply input and filter circuit, filter circuit and rectification circuit and rectification circuit and the resonant transform circuit is disconnected; realization is to the protection of this three partial circuit, and by rear terminal protecting circuit with semi-bridge alternation circuit input end ground connection, realize protection.After overvoltage finishes, above-mentioned cascaded switch can be recovered automatically by same determination methods open-minded.When output produces overvoltage; when being resonant inductance two ends generation overvoltage; rear terminal protecting circuit obtains resonance overvoltage by signal deteching circuit; so that the up and down switch mosfet pipe grid source class short circuit of semi-bridge alternation circuit; realize protection; and pass through the front-end protection circuit so that the cascaded switch between electrodeless lamp power supply input and filter circuit, filter circuit and rectification circuit and rectification circuit and the resonant transform circuit disconnects, realize the protection to this three partial circuit.
By the electrodeless lamp power supply guard method that the present invention proposes, realized under the abnormal conditions the effective protection to electrodeless lamp power supply circuit at different levels, particularly semi-bridge alternation circuit.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (7)
1. the protective circuit of an electrodeless lamp power circuit, described electrodeless lamp power circuit comprises: input; The input switch that links to each other with described input; The filter circuit that links to each other with described input switch is used for power filter and surge absoption; The rectification circuit that links to each other with described filter circuit is used for the filtered power frequency input voltage of described filter circuit is carried out rectification and power factor correction, obtains direct current; The resonant transform circuit that links to each other with described rectification circuit is used for the direct current that described rectification circuit produces is carried out inversion with the acquisition high frequency square wave, and offers Non-polarized lamp after the filtering frequency-selecting; And be connected to the first cascaded switch between described filter circuit and the described rectification circuit; and be connected to the second cascaded switch between described rectification circuit and the described resonant transform circuit; wherein; described input switch, described the first cascaded switch and the second cascaded switch; and the switching tube in the described resonant transform circuit is controlled by power protecting circuit; it is characterized in that, the protective circuit of described electrodeless lamp power circuit comprises:
The front-end protection circuit, overvoltage signal for the power frequency input generation that receives described electrodeless lamp power circuit, overvoltage signal with the resonant inductance that receives rear terminal protecting circuit transmission, and when receiving any overvoltage signal, close described input switch, described the first cascaded switch and the second cascaded switch, and terminal protecting circuit after after the overvoltage signal that the power frequency input that receives described electrodeless lamp power circuit produces, this signal being sent to;
Transformer, the former limit winding of described transformer is the resonant inductance of described resonant transform circuit, the secondary winding is used for the overvoltage signal of described resonant inductance is sent to rear terminal protecting circuit;
Rear terminal protecting circuit; overvoltage signal for the described resonant inductance that receives described transformer transmission; and when receiving the overvoltage signal of the described resonant inductance that described transformer sends with the switching tube grid source shorted in the described resonant transform circuit closing resonant switch, and after the overvoltage signal that receives the described resonant inductance that described transformer sends, this signal is sent to described front-end protection circuit.
2. the protective circuit of electrodeless lamp power circuit as claimed in claim 1; it is characterized in that; described rear terminal protecting circuit also is used for receiving the overvoltage signal that the power frequency input of the described electrodeless lamp power circuit that described front-end protection circuit sends produces, and with the input end grounding of half-bridge inversion circuit in the described resonant transform circuit.
3. the protective circuit of electrodeless lamp power circuit as claimed in claim 1 is characterized in that, also comprises warning circuit, is used for reporting to the police after the alarm signal of receiving described front-end protection circuit or rear terminal protecting circuit.
4. the protective circuit of electrodeless lamp power circuit as claimed in claim 1; it is characterized in that; also being included in described front-end protection circuit and described rear terminal protecting circuit detects after the overvoltage end; open described input switch, described the first cascaded switch and the second cascaded switch, and open resonant switch.
5. the protective circuit of electrodeless lamp power circuit as claimed in claim 1 is characterized in that, described front-end protection circuit comprises:
The first comparator, an one input links to each other with the output of filter circuit in the electrodeless lamp power circuit, another input links to each other with the first reference voltage, when the filtered power frequency input voltage of described filter circuit output during greater than described the first reference voltage, judges to produce overvoltage signal;
The second comparator, an one input links to each other with rear terminal protecting circuit, another input links to each other with the second reference voltage, and the voltage that sends when described rear terminal protecting circuit is during greater than described the second reference voltage, judges the overvoltage signal that receives the resonant inductance that rear terminal protecting circuit sends;
Third level connection switch, fourth stage connection switch and level V connection switch by described the first comparator and the control of described the second comparator, after described the first comparator or described the second comparator detect overvoltage signal, control described third level connection switch, fourth stage connection switch and level V connection switch by described the first comparator or described the second comparator, close so that described third level connection switch, fourth stage connection switch and level V connection switch are controlled described input switch, the first cascaded switch and the second cascaded switch;
The 6th cascaded switch by described the first comparator control; be used for after described the first comparator detects overvoltage signal, controlling described the 6th cascaded switch by described the first comparator, so that an end that links to each other with described rear terminal protecting circuit in described the 6th cascaded switch is in high-impedance state.
6. the protective circuit of electrodeless lamp power circuit as claimed in claim 1 is characterized in that, described rear terminal protecting circuit comprises:
The 3rd comparator, an one input links to each other with the secondary winding of described transformer, and another input links to each other with the 3rd reference voltage, when the voltage of described resonant inductance during greater than described the 3rd reference voltage, judges to produce overvoltage signal;
The 7th cascaded switch and the 8th cascaded switch by described the 3rd comparator control, after detecting overvoltage signal, described the 3rd comparator controls described the 7th cascaded switch and the 8th cascaded switch by described the 3rd comparator, with the switching tube grid source shorted in the described resonant transform circuit; With
The 9th cascaded switch by described the 3rd comparator control; be used for after described the 3rd comparator detects overvoltage signal, controlling described the 9th cascaded switch by described the 3rd comparator, so that an end that links to each other with described front-end protection circuit in described the 9th cascaded switch is in high-impedance state.
7. the protective circuit of electrodeless lamp power circuit as claimed in claim 2 is characterized in that, described rear terminal protecting circuit comprises:
The 4th comparator, an one input links to each other with the front-end protection circuit, another input links to each other with the 4th reference voltage, and the voltage that sends when described front-end protection circuit is during greater than described the 4th reference voltage, judges the overvoltage signal that receives the power frequency input voltage that the front-end protection circuit sends;
By the tenth cascaded switch of described the 4th comparator control, be used for after described the 4th comparator detects overvoltage signal, controlling described the tenth cascaded switch, with the input end grounding with half-bridge inversion circuit in the described resonant transform circuit.
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| CN 201010160055 CN101854766B (en) | 2010-04-23 | 2010-04-23 | Electrodeless lamp power circuit, and protection method and protective circuit thereof |
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| CN 201010160055 CN101854766B (en) | 2010-04-23 | 2010-04-23 | Electrodeless lamp power circuit, and protection method and protective circuit thereof |
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| DE102012111061A1 (en) * | 2012-11-16 | 2014-05-22 | Phoenix Contact Gmbh & Co. Kg | Protection circuit for a current transformer and current transformer with a protection circuit |
| CN103237394B (en) * | 2013-04-26 | 2014-12-03 | 哈尔滨理工大学 | Working state detection alarm system of high-power electrodeless mercury lamp system and detection method of working state detection alarm system of high-power electrodeless mercury lamp system |
| CN103957652B (en) * | 2014-03-31 | 2016-06-29 | 浙江七星青和电子科技有限公司 | A kind of voltage monitoring circuit of DC ballast |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913737A (en) * | 2005-08-08 | 2007-02-14 | 上海大众汽车有限公司 | Circuit of vehicle discharge light ballast |
| CN101553071A (en) * | 2008-04-01 | 2009-10-07 | 台达电子工业股份有限公司 | Discharge lamp system and control method thereof |
-
2010
- 2010-04-23 CN CN 201010160055 patent/CN101854766B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913737A (en) * | 2005-08-08 | 2007-02-14 | 上海大众汽车有限公司 | Circuit of vehicle discharge light ballast |
| CN101553071A (en) * | 2008-04-01 | 2009-10-07 | 台达电子工业股份有限公司 | Discharge lamp system and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017166445A1 (en) * | 2016-03-30 | 2017-10-05 | 广东美的厨房电器制造有限公司 | Surge suppression circuit and microwave oven |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101854766A (en) | 2010-10-06 |
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