CN101309542A - Circuit for detecting current zero-crossing of voltage dropping inductor by voltage of the same - Google Patents
Circuit for detecting current zero-crossing of voltage dropping inductor by voltage of the same Download PDFInfo
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- CN101309542A CN101309542A CNA2007100408190A CN200710040819A CN101309542A CN 101309542 A CN101309542 A CN 101309542A CN A2007100408190 A CNA2007100408190 A CN A2007100408190A CN 200710040819 A CN200710040819 A CN 200710040819A CN 101309542 A CN101309542 A CN 101309542A
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 abstract description 8
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 208000002693 Multiple Abnormalities Diseases 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 230000005283 ground state Effects 0.000 description 1
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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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Abstract
The invention discloses an electric circuit for detecting the current zero-crossing of a voltage reducing inductor by using the voltage of the voltage reducing inductor. The electric circuit comprises a direct current source, a power switching circuit, a current zero-crossing detecting circuit, a pulse modulation circuit and a driving circuit, wherein the power switching circuit comprises a voltage reducing inductor, the output terminal of the direct current source is connected with the first input terminal of the power switching circuit, the zero-crossing detecting circuit obtains a voltage signal from the voltage reducing inductor of the power switching circuit, the output terminal of the current zero-crossing detecting circuit is respectively connected with the input terminals of the pulse modulation circuit and the driving circuit, and the output terminals of the pulse modulation circuit and the driving circuit are connected to the second input terminal of the power switching circuit. The electric circuit overcomes the defaults that in the traditional structure, the current sampling is complex and the cost is high, and also solves the problem that the current zero-crossing detection is difficult when the current in the voltage reducing inductor flows bilaterally; and simultaneously, because the detecting circuit of the invention can ensure the zero-crossing point of the high frequency current to be detected through the switching device under various abnormal conditions, the reliable working of the entire circuit can be ensured.
Description
Technical field
The present invention relates to a kind of voltage detecting buck inductor current over-zero circuit that utilizes buck inductor, be applied in the low-frequency electronic rectifier for metal halogenate lamp high-frequency current in the DC-AC loop is carried out zero passage detection.
Background technology
Low-frequency electronic rectifier for metal halogenate lamp need be transformed into direct voltage (DC) low-frequency ac voltage (AC).At present, way commonly used as shown in Figure 1, this circuit comprises DC source 11, circuit for power conversion 12 and current sampling circuit 13, current over-zero testing circuit 14 and pulse modulation and drive circuit 15, in its circuit for power conversion 12, comprise the switch element Q1 of two switch in series Q1 and two serial connections of Q2 and Q2 mode alternation with low frequency, and in the low frequency operation cycle separately, switch element Q1 or Q2 carry out work in the mode of high frequency ON-OFF.In this mode of operation, open-minded when wishing electric current I zero passage in flowing through current sampling circuit 13 of switch element Q1 or Q2 usually, to reduce switch element Q1 or Q2 switching loss.Because the current sampling circuit in Fig. 1 circuit is in floating ground state, so make current over-zero testing circuit 14 need to adopt the mode of isolating to handle, make the structure of circuit become complicated with ground, increased the cost of circuit, reduced the reliability of circuit.
Summary of the invention
At the problems referred to above, the present invention proposes a kind of improved circuit that utilizes the voltage detecting buck inductor current over-zero of buck inductor, by the sampling to the buck inductor voltage signal, the detection when realizing the electric current I zero passage is to realize no-voltage and the zero current turning-on of switch element Q1 or Q2.
In order to realize the foregoing invention purpose, the present invention adopts following technical scheme, a kind of circuit that utilizes the voltage detecting buck inductor current over-zero of buck inductor, comprise DC source, circuit for power conversion, current over-zero testing circuit and pulse modulation and drive circuit, described circuit for power conversion comprises a buck inductor, it is characterized in that, the output of described DC source connects the first input end of described circuit for power conversion, described zero cross detection circuit is obtained voltage signal from the buck inductor of described circuit for power conversion, the output of described current over-zero testing circuit connects the input of described pulse modulation and drive circuit, and the output of described pulse modulation and drive circuit is connected to second input of described circuit for power conversion.
Reasonable is that described current over-zero testing circuit further comprises the rectification circuit and the zero cross detection circuit of series connection.
Reasonablely be, described zero cross detection circuit comprises a pulse signal generator, and comparator, the driving pulse same-phase that pulse signal that described pulse signal generator sends and described pulse modulation and drive circuit send, this pulse signal generator one first resistance of connecting becomes first branch road, one electric capacity is in parallel with described first branch road, then with the negative phase end that is connected to comparator after diode is connected; Wherein, the output of described rectification circuit is by second resistance and voltage stabilizing didoe series connection back ground connection, tie point between described second resistance and voltage stabilizing didoe is connected to the negative phase end of described comparator, and the positive terminal of described comparator links to each other with a direct current reference voltage source.
Reasonable is that described rectification circuit is a bridge rectifier.
Reasonable is that described rectification circuit is a full-wave rectifying circuit.
The invention solves current sampling complexity in the traditional scheme, the shortcoming that cost is high, and the electric current in the buck inductor is when being two-way flow, the problem of current over-zero detection difficult.Simultaneously, because testing circuit of the present invention can make switching device can both detect the zero crossing of high-frequency current under multiple abnormality, therefore, can guarantee the reliably working of entire circuit.
Description of drawings
Below, with reference to accompanying drawing, for those skilled in the art that, from detailed description of the present invention, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Fig. 1 is the composition frame chart of existing circuit;
Fig. 2 is a circuit block diagram of the present invention;
Fig. 3 is the circuit diagram among Fig. 2;
Fig. 4 is the composition frame chart of the circuit for power conversion among Fig. 2;
Fig. 5 is the circuit diagram of circuit for power conversion among Fig. 4.
Embodiment
See also shown in Figure 2, the circuit of the voltage detecting buck inductor current over-zero of buck inductor that utilizes of the present invention comprises DC source 21, circuit for power conversion 22, current over-zero testing circuit 23 and pulse modulation and drive circuit 24, wherein DC source 21 outputs connect an input of circuit for power conversion 22, the output of circuit for power conversion 22 connects the input of current over-zero testing circuit 23, the output of current over-zero testing circuit 23 connects the input of pulse modulation and drive circuit 24, and the output of pulse modulation and drive circuit 24 is connected to another input of circuit for power conversion 22.Find out that easily this scheme is than having reduced current sampling circuit in the traditional structure, the current over-zero testing circuit no longer floatingly simultaneously.
Fig. 3 has further illustrated a kind of concrete structure of circuit for power conversion 22 among Fig. 2, this circuit for power conversion 12 comprises two capacitor C 1 and C2, load filter inductance L1 and buck inductor L2, two tandem tap elements and Q2, a load resistance Rlamp, wherein connect with load filter inductance L1 in the load resistance Rlamp and second capacitor C 2 back in parallel, between 1 of capacitor C and second capacitor C 2 and load filter inductance L1 that are connected in parallel on after connecting.What pay special attention to is, current over-zero testing circuit 23 takes out its voltage signal from the buck inductor L2 of circuit for power conversion 22, and the present invention utilizes this voltage signal to detect the mistake nought state that flows through the pulse current I on the buck inductor L2.
Fig. 4 has provided the block diagram of current over-zero testing circuit 23 and has formed, rectification circuit 41 and zero cross detection circuit 42 by series connection are formed, Fig. 5 has illustrated a kind of of its physical circuit, formed bridge rectifier 41 by four diode D1～D4, in the zero cross detection circuit 42, pulse signal V_pluse connects with capacitor C by first resistance R 1, tie point in the middle of resistance R 1 and the capacitor C is connected to the negative phase end of comparator comp by diode D5, the output Vs of bridge rectifier 41 is connected in series to ground through resistance R 2 and voltage stabilizing didoe D6, being connected in series between resistance R 2 and voltage stabilizing didoe D6 a little is connected to the negative phase end of comparator, and the positive terminal of comparator comp connects a direct current reference voltage Vref.A among Fig. 5, B are the two ends from the coil N1 of buck inductor L2 among Fig. 3, Vref is the DC reference voltage source, comparator comp is the comparator of a band Enable Pin ENABLE, (also can not be with Enable Pin), V_pulse is and the synchronous pulse signal of the driving pulse of switching device Q1 or Q2, the output signal Vsignal of comparator comp is an electric current I zero passage detection signal, and when current over-zero, detection signal Vsignal is high.
In this circuit, as pulse signal V_pulse when being high, produce a direct current signal Vs of pulsing after being added in rectification circuit 41 rectifications of voltage signal on the buck inductor L2 by four diode D1～D4 composition, signal Vs produces voltage Vd by resistance R 1 and diode D6, the voltage Vr that voltage Vd is provided to the positive terminal of comparator comp greater than DC reference voltage source Vref, this moment, the output signal Vsignal of comparator comp was low.Simultaneously, when being high,, make the voltage Vt on the capacitor C be slightly larger than Vd by resistance R 1 and diode D5 owing to driving pulse V_pulse.When being low with the synchronous pulse signal V_pulse of driving pulse, then switching device Q1 or the Q2 by driving pulse control turn-offs, because the commutation of the voltage instantaneous on the buck inductor L2, the output ripple direct current signal Vs that makes the rectification circuit 41 in this moment is zero, but this moment, electric current I was also non-vanishing.Because the existence of the voltage Vt between resistance R 1 and the capacitor C by diode D5, makes voltage Vd＞voltage Vr, it is low keeping the output signal Vsignal of comparator comp, has avoided output signal Vsignal to go out height, produces false triggering.For after low, the voltage Vt on the capacitor C discharges through pulse power supply V_pulse by resistance R 1 at pulse signal V_pulse, and to zero, and because inductive current I discharge, making Vs is height, and then keeps Vd＞Vr.When inductive current I discharge is zero, voltage Vt and direct current signal Vs are zero, make output signal Vsignal go out height, produced real zero cross signal, and open switch element Q1 or Q2 by driving pulse, realize the zero current turning-on of switch element Q1 or Q2, reduced the switching loss of switch element Q1 or Q2.
When circuit for power conversion commutation or some abnormal work state, the voltage of the coil N2 of buck inductor L2 can go out zero in moment, at this moment, by the discharge time of controlling resistance R1 and capacitor C, make voltage Vt at short notice greater than voltage Vr, can effectively avoid the false triggering of output signal Vsignal, work safely and reliably to guarantee circuit for power conversion.
Testing circuit shown in Figure 5 has solved current sampling complexity in the circuit of Fig. 1 well, the shortcoming that cost is high, and when having solved electric current among the buck inductor L2 well and being two-way flow, the problem of current over-zero detection difficult.Simultaneously, because testing circuit of the present invention can make switching device Q1 and Q2 can both detect the zero crossing of high-frequency current I under multiple abnormality, therefore, can guarantee the reliably working of entire circuit.
The front provides the description of relative preferred embodiment, so that any technical staff in this area can use or utilize the present invention.Various modifications to these embodiment are conspicuous to those skilled in the art, can be applied to other embodiment to total principle described here and not use creativeness.Thereby, the embodiment shown in the present invention will be not limited to here, and the wide region of principle that should disclose and new feature according to meeting here.
Claims (5)
1, a kind of circuit that utilizes the voltage detecting buck inductor current over-zero of buck inductor comprises DC source, circuit for power conversion, current over-zero testing circuit and pulse modulation and drive circuit, and described circuit for power conversion comprises a buck inductor, it is characterized in that,
The output of described DC source connects the first input end of described circuit for power conversion, described zero cross detection circuit is obtained voltage signal from the buck inductor of described circuit for power conversion, the output of described current over-zero testing circuit connects the input of described pulse modulation and drive circuit, and the output of described pulse modulation and drive circuit is connected to second input of described circuit for power conversion.
2, the circuit that utilizes the voltage detecting buck inductor current over-zero of buck inductor according to claim 1 is characterized in that,
Described current over-zero testing circuit further comprises the rectification circuit and the zero cross detection circuit of series connection.
3, the circuit that utilizes the voltage detecting buck inductor current over-zero of buck inductor according to claim 2 is characterized in that,
Described zero cross detection circuit comprises a pulse signal generator, and comparator, the driving pulse same-phase that pulse signal that described pulse signal generator sends and described pulse modulation and drive circuit send, this pulse signal generator one first resistance of connecting becomes first branch road, one electric capacity is in parallel with described first branch road, then with the negative phase end that is connected to comparator after diode is connected;
Wherein, the output of described rectification circuit is by second resistance and voltage stabilizing didoe series connection back ground connection, tie point between described second resistance and voltage stabilizing didoe is connected to the negative phase end of described comparator, and the positive terminal of described comparator links to each other with a direct current reference voltage source.
4, the circuit that utilizes the voltage detecting buck inductor current over-zero of buck inductor according to claim 3 is characterized in that,
Described rectification circuit is a bridge rectifier.
5, the circuit that utilizes the voltage detecting buck inductor current over-zero of buck inductor according to claim 3 is characterized in that,
Described rectification circuit is a full-wave rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100408190A CN101309542A (en) | 2007-05-18 | 2007-05-18 | Circuit for detecting current zero-crossing of voltage dropping inductor by voltage of the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100408190A CN101309542A (en) | 2007-05-18 | 2007-05-18 | Circuit for detecting current zero-crossing of voltage dropping inductor by voltage of the same |
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| Publication Number | Publication Date |
|---|---|
| CN101309542A true CN101309542A (en) | 2008-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100408190A Pending CN101309542A (en) | 2007-05-18 | 2007-05-18 | Circuit for detecting current zero-crossing of voltage dropping inductor by voltage of the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104067497A (en) * | 2012-01-25 | 2014-09-24 | 丰田自动车株式会社 | Control device for voltage conversion device |
| CN104201887A (en) * | 2014-09-01 | 2014-12-10 | 矽力杰半导体技术(杭州)有限公司 | Zero crossing regulating circuit and zero crossing regulating method of buck converter |
| WO2016078590A1 (en) * | 2014-11-19 | 2016-05-26 | Huawei Technologies Co., Ltd. | Zero voltage switching detection apparatus and method |
| CN115219778A (en) * | 2021-04-15 | 2022-10-21 | 欧司朗股份有限公司 | Current measuring device for power converter and regulating circuit for applying same |
-
2007
- 2007-05-18 CN CNA2007100408190A patent/CN101309542A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104067497A (en) * | 2012-01-25 | 2014-09-24 | 丰田自动车株式会社 | Control device for voltage conversion device |
| CN104067497B (en) * | 2012-01-25 | 2016-09-28 | 丰田自动车株式会社 | The control device of voltage conversion device |
| CN104201887A (en) * | 2014-09-01 | 2014-12-10 | 矽力杰半导体技术(杭州)有限公司 | Zero crossing regulating circuit and zero crossing regulating method of buck converter |
| WO2016078590A1 (en) * | 2014-11-19 | 2016-05-26 | Huawei Technologies Co., Ltd. | Zero voltage switching detection apparatus and method |
| CN107078634A (en) * | 2014-11-19 | 2017-08-18 | 华为技术有限公司 | Zero voltage switching detection device and method |
| US9812968B2 (en) | 2014-11-19 | 2017-11-07 | Futurewei Technologies, Inc. | Zero voltage switching detection apparatus and method |
| CN107078634B (en) * | 2014-11-19 | 2020-07-07 | 华为技术有限公司 | Zero voltage switching detection device and method |
| CN115219778A (en) * | 2021-04-15 | 2022-10-21 | 欧司朗股份有限公司 | Current measuring device for power converter and regulating circuit for applying same |
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Open date: 20081119 |