CN103207302B - Detection circuit and power correction circuit for inductor discharge current - Google Patents
Detection circuit and power correction circuit for inductor discharge current Download PDFInfo
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- CN103207302B CN103207302B CN201210016923.7A CN201210016923A CN103207302B CN 103207302 B CN103207302 B CN 103207302B CN 201210016923 A CN201210016923 A CN 201210016923A CN 103207302 B CN103207302 B CN 103207302B
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- 238000012937 correction Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title abstract description 6
- 230000001939 inductive effect Effects 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims description 52
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- IXSZQYVWNJNRAL-UHFFFAOYSA-N etoxazole Chemical compound CCOC1=CC(C(C)(C)C)=CC=C1C1N=C(C=2C(=CC=CC=2F)F)OC1 IXSZQYVWNJNRAL-UHFFFAOYSA-N 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a detection circuit and a power correction circuit for inductor discharge current. Wherein, detection circuitry includes: the input terminal is connected to the first end of the secondary winding of the inductor and used for collecting the discharge current of the inductor; a direct current power supply; a transistor having a first end connected to the input terminal and a second end connected to a direct current power supply; an output terminal connected to a first node, wherein the first node is a node between the second terminal of the transistor and the dc power supply; and the signal processor is connected with the output terminal and used for judging whether the discharge current is zero or not according to the output signal of the output terminal. According to the invention, the problem of complex detection circuit structure when the zero-crossing signal of the inductive current is detected in the prior art is solved, and the effects of simplifying the detection circuit structure and reducing the production cost are achieved.
Description
Technical field
The present invention relates to circuit field, in particular to a kind of testing circuit and power factor correction circuit of inductive discharge electric current.
Background technology
In prior art, power factor correction circuit PFC (Power Factor Correction, be called for short PFC) control program need inductive discharge electric current be zero moment gauge tap transistor ON with give induction charging, so need interlock circuit whether to be zero for detecting inductive current, the general chips such as comparer that use realize current zero detection at present, and circuit structure is comparatively complicated and cost is higher.Simultaneously, when between target output voltage and power input voltage, pressure reduction is less, the energy storage afterflow effect of inductance is more weak, therefore there will be inductive current zero cross signal at power input voltage peak center and near zone abnormal, but PFC control chip is now still according to the abnormal zero cross signal gauge tap transistor turns detected, result can cause the On current of switching transistor and inductance excessive and produce obvious noise and EMI (Electromagnetic Interference is called for short EMI) electromagnetic interference (EMI).
For testing circuit baroque problem when detecting inductive current zero cross signal in correlation technique, at present effective solution is not yet proposed.
Summary of the invention
Fundamental purpose of the present invention is the testing circuit and the power factor correction circuit that provide a kind of inductive discharge electric current, testing circuit baroque problem when detecting inductive current zero cross signal in prior art to solve.
To achieve these goals, according to an aspect of the present invention, provide a kind of testing circuit of inductive discharge electric current, comprising: input terminal, be connected to the first end of the secondary winding of inductance, for gathering the discharge current of inductance; Direct supply; Transistor, first end is connected to input terminal, and the second end is connected to direct supply; Lead-out terminal, is connected to first node, and wherein, first node is the node between the second end of transistor and direct supply; And signal processor, be connected with lead-out terminal, for judging according to the output signal of lead-out terminal whether discharge current is zero.Particularly, when the discharge current that input terminal collects is greater than zero, transistor turns works, lead-out terminal output low level signal, when the discharge current that input terminal collects equals zero, transistor cutoff, do not work, lead-out terminal exports high level signal, according to the high level signal that lead-out terminal exports, signal processor can be judged to be that discharge current is zero, can be judged to be that discharge current is greater than zero according to the low level signal that lead-out terminal exports.
Further, testing circuit also comprises: the first current-limiting resistance, is connected between input terminal and the first end of transistor; Second current-limiting resistance, is connected between first node and direct supply; And the 3rd current-limiting resistance (R4), be connected between first node and lead-out terminal.
Further, testing circuit also comprises: isolating diode, is connected between input terminal and the first current-limiting resistance (R1); Voltage stabilizing diode, first end is connected with input terminal, the second end ground connection; And divider resistance, first end is connected to the first end of transistor, the second end ground connection.
Further, transistor is triode.
To achieve these goals, according to a further aspect in the invention, provide a kind of power factor correction circuit, comprising: input end and output terminal; Any one testing circuit that foregoing of the present invention provides, wherein, the primary windings connected in series of inductance is between input end and output terminal, and testing circuit is connected to the first end of the secondary winding of inductance; On-off circuit, is connected between the second end of the secondary winding of inductance and output terminal; And control circuit, be connected respectively with on-off circuit with testing circuit, close for controlling on-off circuit when testing circuit exports high level signal, controlling on-off circuit when testing circuit output low level signal and disconnecting.
Further, control circuit comprises: controller, the first end of controller is connected to the input terminal of testing circuit, second end of controller is connected to the signal output part of the signal processor of testing circuit, and whether the described discharge current judged for the discharge current of described inductance and signal processor is the signal of zero.
Further, power factor correction circuit also comprises: voltage detecting circuit, is connected between the armature winding of inductance and output terminal, for detecting the sparking voltage of inductance, wherein, control circuit is connected with voltage detecting circuit, for when sparking voltage is less than preset value, gauge tap closing of circuit.
By the present invention, adopt the testing circuit be made up of following element, comprising: input terminal, be connected to the first end of the secondary winding of inductance, for gathering the discharge current of inductance; Direct supply; Transistor, first end is connected to input terminal, and the second end is connected to direct supply; Lead-out terminal, is connected to first node, and wherein, first node is the node between the second end of transistor and direct supply; And signal processor, be connected with lead-out terminal, for judging according to the output signal of lead-out terminal whether discharge current is zero.When the discharge current that input terminal collects is greater than zero, transistor turns works, lead-out terminal output low level signal, when the discharge current that input terminal collects equals zero, transistor cutoff, do not work, lead-out terminal exports high level signal, the high level signal that signal processor is exported by lead-out terminal or low level signal can judge whether inductive current is zero, solve testing circuit baroque problem when inductive current zero cross signal being detected in prior art, and then reach simplification testing circuit structure, reduce the effect of production cost.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the testing circuit according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of power factor correction circuit according to a first embodiment of the present invention; And
Fig. 3 is the schematic diagram of power factor correction circuit according to a second embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Fig. 1 is the schematic diagram of the testing circuit according to the embodiment of the present invention, as shown in Figure 1, the testing circuit of this embodiment comprises: input terminal, lead-out terminal, direct supply VCC, the first current-limiting resistance R1, the second current-limiting resistance R3, the 3rd current-limiting resistance R4, divider resistance R2, isolating diode D1, voltage stabilizing diode ZD, transistor and signal processor DSP (not shown in figure 1), wherein, the preferred triode Q1 of transistor, to reduce the production cost of testing circuit.
Particularly, input terminal, is connected to the first end of the secondary winding of inductance L, for gathering the discharge current of inductance; Triode Q1, base stage is connected to input terminal by the first current-limiting resistance R1, and collector is connected to direct supply by the second current-limiting resistance R3; Lead-out terminal, is connected to first node by the 3rd current-limiting resistance R4, and wherein, first node is the node between triode Q1 and the second current-limiting resistance R3, and the other end of the 3rd current-limiting resistance R4 is by electric capacity C1 ground connection; Isolating diode D1, first end is connected with described input terminal, and the second end is connected to the first end of described triode Q1; Voltage stabilizing diode ZD, first end is connected with described input terminal, the second end ground connection; Divider resistance R2, first end is connected to the first end of described triode Q1, the second end ground connection.
Adopt the testing circuit of said structure, the inductance L discharge current of input terminal collection has the semiconductor diode ZD voltage stabilizing of pressure stabilization function through one, the resistance R1 that signal after voltage stabilizing has metering function through one again through the semiconductor devices D1 that has one-way conduction characteristic controls extremely to be connected with triode Q1, when inductance L is discharged, this circuit significantly can not consume the energy that inductance L stores, the pole of triode Q1 control is simultaneously connected with signal ground by a divider resistance R2, collector is connected with a direct-flow voltage regulation source VCC by the resistance R3 that has metering function, making triode Q1 control pole by resistance R2 can rapid discharge enter cut-off state after inductance L electric discharge terminates, the emitter of triode Q1 is connected with signal ground, output signal exports through current-limiting resistance R4, when the discharge current of the inductance that input terminal collects is greater than zero, triode Q1 ON operation, lead-out terminal output low level signal, when the discharge current of the inductance that input terminal collects equals zero, triode Q1 ends, do not work, lead-out terminal exports high level signal.The high level signal that signal processor DSP is exported by lead-out terminal or low level signal can judge whether inductive current is zero, solve testing circuit baroque problem when inductive current zero cross signal being detected in prior art, and then reach simplification testing circuit structure, reduce the effect of production cost.
Fig. 2 is the schematic diagram of power factor correction circuit according to a first embodiment of the present invention, and as shown in Figure 2, the power factor correction circuit of this embodiment comprises: input end, output terminal, embodiment of the present invention testing circuit that foregoing provides, on-off circuit and control circuit.
Wherein, the primary windings connected in series of inductance is between the input end and output terminal of power factor correction circuit, and testing circuit is connected to the first end of the secondary winding of inductance; On-off circuit, is connected between the second end of the secondary winding of inductance and the output terminal of power factor correction circuit; Control circuit, is connected with on-off circuit respectively with testing circuit, closing, controlling on-off circuit disconnect when testing circuit output low level signal for controlling on-off circuit when testing circuit exports high level signal.
Particularly, control circuit in this embodiment can adopt digital signal processing DSP (Digital Signal Processor, be called for short DSP) circuit or Micro-processor MCV (Micro programmed Control Unit, be called for short MCU), wherein, DSP or MCU is equivalent to the signal processor of the testing circuit that embodiment of the present invention foregoing provides.The input end of control circuit is connected with the lead-out terminal of testing circuit, and the signal of the lead-out terminal output of testing circuit transfers to the input end (that is, detecting pin) of control circuit after the filtering circuit that current-limiting resistance R4 and filter capacitor C1 forms.When testing circuit exports high level signal, control circuit DSP (or MCU) receives the current zero-crossing signal of inductance L, gauge tap closing of circuit, on-off circuit closes conduction period inductance L charging energy-storing, testing circuit continues to export high level signal simultaneously, after reaching preset value, gauge tap circuit disconnects, now inductance L start electric discharge and by diode D output voltage to load, this testing circuit output low level signal simultaneously, until inductive discharge terminates this testing circuit outputs level signals become high level signal from low level signal again, after control circuit receives high level signal, on-off circuit conducting, cycle control like this.
Preferably, the power factor correction circuit of the embodiment of the present invention also comprises: voltage detecting circuit, be connected between the armature winding of inductance L and the output terminal of power factor correction circuit, for detecting the sparking voltage of described inductance L, wherein, control circuit DSP (or MCU) is connected with voltage detecting circuit, for when the sparking voltage of inductance L is less than preset value, and gauge tap closing of circuit.Enumerate explanation: the input voltage V of input end in power factor correction circuit
ifor 220V, the pre-set output voltage value Vo of output terminal is 350V, when inductance L regular picture, the actual value of output voltage reaches 350V, this actual value can meet the magnitude of voltage needed for power factor correction circuit, sufficient in the reliable current zero-crossing signal of generation in order to ensure the energy that inductance stores, so, generally will
the magnitude of voltage of+20 as preset value, when the sparking voltage of inductance L is less than the size of preset value Vo, gauge tap closing of circuit, such as input voltage is 200V, 200*1.414+20V=313V, if the sparking voltage of inductance L is less than 313V, then gauge tap closing of circuit.
Due to when the sparking voltage of inductance L is less than preset voltage value, although now its sparking voltage is greater than zero, but less sparking voltage can not meet the demand of the output voltage of power factor correction circuit, by arranging voltage detecting circuit, reach the effect accurately controlling power factor correction circuit work.
Fig. 3 is the schematic diagram of power factor correction circuit according to a second embodiment of the present invention, as shown in Figure 3, the difference of the power factor correction circuit in this embodiment and the power factor correction circuit in first embodiment of the invention is: the control circuit of the power factor correction circuit of second embodiment of the invention is made up of DSP (or MCU) and power factor correction circuit controller PFCController, wherein, PFC Controller is connected with the first end of the secondary winding of inductance L, and be connected between DSP (or MCU) and on-off circuit, now, PFC Controller and DSP detects the current zero-crossing signal of inductance L, DSP is the disconnection or closed that auxiliary PFC control completes gauge tap circuit.Also be, when testing circuit exports high level signal, control circuit DSP (or MCU) and PFC control receives the inductance zero cross signal of inductance L, DSP (or MCU) is by power factor correction circuit controller PFC Controller gauge tap closing of circuit, on-off circuit closes conduction period inductance L charging energy-storing, testing circuit continues to export high level signal simultaneously, after reaching preset value, gauge tap circuit disconnects, now inductance L start electric discharge and by diode D output voltage to load, this testing circuit output low level signal simultaneously, until inductive discharge terminates this testing circuit outputs level signals become high level signal from low level signal again, after control circuit receives inductive current zero cross signal, on-off circuit conducting, cycle control like this.
Because PFC Controller chip and the chip in on-off circuit are when being connected, the matching degree of each pin is higher, by DSP (or MCU) and the common composition control circuit of PFC Controller, DSP assists PFC control to complete the disconnection or closed of gauge tap circuit, reaches the effect of optimizing power correcting circuit.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a testing circuit for inductive discharge electric current, is characterized in that, comprising:
Input terminal, is connected to the first end of the secondary winding of inductance (L), for gathering the discharge current of described inductance (L);
Direct supply;
Transistor, first end is connected to described input terminal, and the second end is connected to described direct supply;
Lead-out terminal, is connected to first node, and wherein, described first node is the node between the second end of described transistor and described direct supply;
Signal processor, is connected with described lead-out terminal, for judging according to the output signal of described lead-out terminal whether described discharge current is zero;
Isolating diode (D1), between the first end being connected to described input terminal and described transistor;
Voltage stabilizing diode (ZD), first end is connected with described input terminal, the second end ground connection; And
Divider resistance (R2), first end is connected to the first end of described transistor, the second end ground connection.
2. testing circuit according to claim 1, is characterized in that, described testing circuit also comprises:
First current-limiting resistance (R1), is connected between described isolating diode (D1) and the first end of described transistor;
Second current-limiting resistance (R3), is connected between described first node and described direct supply; And
3rd current-limiting resistance (R4), is connected between described first node and described lead-out terminal.
3. testing circuit according to claim 1, is characterized in that, described transistor is triode.
4. a power factor correction circuit, is characterized in that, comprising:
Input end and output terminal;
Testing circuit according to any one of claims 1 to 3, wherein, the primary windings connected in series of described inductance (L) is between described input end and described output terminal, and described testing circuit is connected to the first end of the secondary winding of described inductance (L);
On-off circuit, between the second end being connected to the secondary winding of described inductance (L) and described output terminal; And
Control circuit, is connected with described on-off circuit respectively with described testing circuit, closes, control described on-off circuit disconnect when described testing circuit output low level signal for controlling described on-off circuit when described testing circuit exports high level signal.
5. power factor correction circuit according to claim 4, is characterized in that, described control circuit comprises:
Controller, the first end of described controller is connected to the input terminal of described testing circuit, second end of described controller is connected to the signal output part of the signal processor of described testing circuit, and whether the described discharge current judged for the discharge current and described signal processor that receive described inductance (L) is the signal of zero.
6. power factor correction circuit according to claim 4, is characterized in that, described power factor correction circuit also comprises:
Voltage detecting circuit, between the armature winding being connected to inductance (L) and described output terminal, for detecting the sparking voltage of described inductance (L),
Wherein, described control circuit is connected with described voltage detecting circuit, for when described sparking voltage is less than preset value, controls described on-off circuit and closes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210016923.7A CN103207302B (en) | 2012-01-17 | 2012-01-17 | Detection circuit and power correction circuit for inductor discharge current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210016923.7A CN103207302B (en) | 2012-01-17 | 2012-01-17 | Detection circuit and power correction circuit for inductor discharge current |
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| Publication Number | Publication Date |
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| CN103207302A CN103207302A (en) | 2013-07-17 |
| CN103207302B true CN103207302B (en) | 2015-07-29 |
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| CN201210016923.7A Active CN103207302B (en) | 2012-01-17 | 2012-01-17 | Detection circuit and power correction circuit for inductor discharge current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI724709B (en) | 2019-12-25 | 2021-04-11 | 財團法人工業技術研究院 | Piezoelectric sensing circuit and piezoelectric sensing system |
| CN113029397B (en) * | 2019-12-25 | 2023-04-07 | 财团法人工业技术研究院 | Piezoelectric sensing circuit and piezoelectric sensing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003532361A (en) * | 2000-04-21 | 2003-10-28 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | AC-DC converter |
| CN1275376C (en) * | 2002-08-12 | 2006-09-13 | 天网电子股份有限公司 | Auxiliary circuit for power factor read just apparatus |
| DE102006018577A1 (en) * | 2006-04-21 | 2007-10-25 | Tridonicatco Gmbh & Co. Kg | Step-up Power Factor Correction Circuit (Boost PFC) |
| CN101282079B (en) * | 2007-04-05 | 2011-06-01 | 昂宝电子（上海）有限公司 | System and method for power controller |
| CN101552546B (en) * | 2008-04-02 | 2011-10-12 | 台达能源技术（上海）有限公司 | Bridgeless power factor circuit correcting circuit system used for critical conduction mode and control method thereof |
| CN201336574Y (en) * | 2008-11-11 | 2009-10-28 | 上海诚跃电气科技有限公司 | Single-phase power factor correction circuit with correct input voltage zero crossing detection |
| CN101738535A (en) * | 2008-11-21 | 2010-06-16 | 上海电机学院 | Alternating voltage zero-crossing detection circuit for power factor correction control circuit |
| DE102009034350A1 (en) * | 2009-07-23 | 2011-02-03 | Tridonicatco Gmbh & Co. Kg | Method and circuit for power factor correction |
| US8553439B2 (en) * | 2010-02-09 | 2013-10-08 | Power Integrations, Inc. | Method and apparatus for determining zero-crossing of an AC input voltage to a power supply |
| US8482268B2 (en) * | 2010-09-16 | 2013-07-09 | System General Corporation | Correction circuit of a switching-current sample for power converters in both CCM and DCM operation |
| CN201846243U (en) * | 2010-11-18 | 2011-05-25 | Bcd半导体制造有限公司 | Zero-crossing detection circuit of switching power supply |
| CN202443052U (en) * | 2012-01-17 | 2012-09-19 | 珠海格力电器股份有限公司 | Detection circuit and power correction circuit for inductor discharge current |
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