CN103207302A - Detecting circuit of discharge current of inductor and power factor correction circuit - Google Patents
Detecting circuit of discharge current of inductor and power factor correction circuit Download PDFInfo
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- CN103207302A CN103207302A CN2012100169237A CN201210016923A CN103207302A CN 103207302 A CN103207302 A CN 103207302A CN 2012100169237 A CN2012100169237 A CN 2012100169237A CN 201210016923 A CN201210016923 A CN 201210016923A CN 103207302 A CN103207302 A CN 103207302A
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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
Abstract
The invention discloses a detecting circuit of discharge current of an inductor and a power factor correction circuit. The detecting circuit comprises an input terminal, a direct-current power supply, a transistor, an output terminal and a signal processor. The input terminal is connected with a first end of a primary winding of the inductor and used for collecting the discharge current of the inductor. A first end of the transistor is connected with the input terminal, and a second end of the transistor is connected with the direct-current power supply. The output terminal is connected with a first node, and the first node is a node between the second end of the transistor and the direct-current power supply. The signal processor is connected with the output terminal and used for judging whether the discharge current is zero according to an output signal of the output terminal. By means of the detecting circuit, a problem in the prior art that a detecting circuit for detecting inductive current zero passage signals is complex in structure is solved, and a purpose of simplifying the detecting circuit structure and reducing production cost is 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 the prior art, power factor correction circuit PFC (Power Factor Correction, abbreviation PFC) control scheme need be that zero moment gauge tap transistor opens to give induction charging at the inductive discharge electric current, so need whether interlock circuit is zero for detection of inductive current, at present the general chip such as comparer that uses realizes that current zero detects, and circuit structure comparatively complexity and cost is higher.Simultaneously, pressure reduction hour between target output voltage and power input voltage, a little less than the energy storage afterflow effect of inductance, therefore at power input voltage peak value center and near zone the inductive current zero cross signal can to occur unusual, but the PFC control chip of this moment is still according to the unusual zero cross signal gauge tap transistor turns that detects, the result can cause the conducting electric current of switching transistor and inductance excessive and produce tangible noise and EMI (Electromagnetic Interference is called for short EMI) electromagnetic interference (EMI).
The baroque problem of testing circuit does not propose effective solution at present as yet when in the correlation technique inductive current zero cross signal being detected.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of testing circuit and power factor correction circuit of inductive discharge electric current, the baroque problem of testing circuit when to solve in the prior art inductive current zero cross signal being detected.
To achieve these goals, according to an aspect of the present invention, provide a kind of testing circuit of inductive discharge electric current, having comprised: input terminal, be connected first end of the secondary winding of inductance, be used for gathering the discharge current of inductance; Direct supply; Transistor, first end is connected in input terminal, and second end is connected in direct supply; Lead-out terminal is connected in first node, and wherein, first node is the node between transistorized second end and the direct supply; And signal processor, be connected with lead-out terminal, be used for judging according to the output signal of lead-out terminal whether discharge current is zero.Particularly, the discharge current that collects when input terminal is greater than zero the time, transistor turns work, lead-out terminal output low level signal, when the discharge current that collects when input terminal equalled zero, transistor ended, do not work, lead-out terminal output high level signal, it is zero that the high level signal that signal processor is exported according to lead-out terminal can be judged to be discharge current, the low level signal of exporting according to lead-out terminal can be judged to be discharge current greater than zero.
Further, testing circuit also comprises: first current-limiting resistance is connected between input terminal and transistorized first end; Second current-limiting resistance is connected between first node and the direct supply; And the 3rd current-limiting resistance (R4), be connected between first node and the lead-out terminal.
Further, testing circuit also comprises: isolating diode is connected between input terminal and 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 in transistorized first end, 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, having comprised: input end and output terminal; Any testing circuit that foregoing of the present invention provides, wherein, the elementary windings in series of inductance is between input end and output terminal, and testing circuit is connected to first end of the secondary winding of inductance; On-off circuit is connected between second end and output terminal of secondary winding of inductance; And control circuit, be connected respectively with on-off circuit with testing circuit, be used for control on-off circuit closure when testing circuit output high level signal, the control on-off circuit disconnects when testing circuit output low level signal.
Further, control circuit comprises: controller, first end of controller is connected in the input terminal of testing circuit, second end of controller is connected in the signal output part of the signal processor of testing circuit, is used for whether the discharge current of described inductance and the described discharge current of judging of signal processor are zero signal.
Further, power factor correction circuit also comprises: voltage detecting circuit is connected between the elementary winding and output terminal of inductance, for detection of the sparking voltage of inductance, wherein, control circuit is connected with voltage detecting circuit, be used at sparking voltage during less than preset value the gauge tap closing of circuit.
By the present invention, adopt the testing circuit that is constituted by following element, comprising: input terminal, be connected first end of the secondary winding of inductance, be used for gathering the discharge current of inductance; Direct supply; Transistor, first end is connected in input terminal, and second end is connected in direct supply; Lead-out terminal is connected in first node, and wherein, first node is the node between transistorized second end and the direct supply; And signal processor, be connected with lead-out terminal, be used for judging according to the output signal of lead-out terminal whether discharge current is zero.The discharge current that collects when input terminal is greater than zero the time, transistor turns work, lead-out terminal output low level signal, when the discharge current that collects when input terminal equals zero, transistor ends, do not work, lead-out terminal output high level signal, signal processor can judge by high level signal or the low level signal of lead-out terminal output whether inductive current is zero, solved in the prior art the baroque problem of testing circuit when the inductive current zero cross signal detected, and then simplification testing circuit structure, the effect that reduces production costs have been reached.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the synoptic diagram according to the testing circuit of the embodiment of the invention;
Fig. 2 is the synoptic diagram according to the power factor correction circuit of first embodiment of the invention; And
Fig. 3 is the synoptic diagram according to the power factor correction circuit of second embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 1 is the synoptic diagram according to the testing circuit of the embodiment of the 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 is to reduce the production cost of testing circuit.
Particularly, input terminal is connected first end of the secondary winding of inductance L, is used for gathering the discharge current of inductance; Triode Q1, base stage is connected in input terminal by the first current-limiting resistance R1, and collector is connected in direct supply by the second current-limiting resistance R3; Lead-out terminal is connected in 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 capacitor C 1 ground connection; Isolating diode D1, first end is connected with described input terminal, and second end is connected in 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 are connected in 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 is through a semiconductor diode ZD voltage stabilizing with pressure stabilization function, signal after the voltage stabilizing extremely links to each other with triode Q1 control through a resistance R 1 with metering function through a semiconductor devices D1 with unidirectional on state characteristic again, this circuit can significantly not consume the inductance L energy stored when making the inductance L discharge, the utmost point of triode Q1 control simultaneously links to each other with signal ground by a divider resistance R2, collector links to each other with a direct current source of stable pressure VCC by a resistance R 3 with metering function, make that by resistance R 2 the triode Q1 control utmost point can rapid discharge after the inductance L discharge finishes and enter cut-off state, the emitter of triode Q1 links to each other with signal ground, output signal is exported through current-limiting resistance R4, the discharge current of the inductance that collects when input terminal is greater than zero the time, triode Q1 conducting work, lead-out terminal output low level signal, when the discharge current of the inductance that collects when input terminal equals zero, triode Q1 ends, do not work lead-out terminal output high level signal.Signal processor DSP can judge by high level signal or the low level signal of lead-out terminal output whether inductive current is zero, solved in the prior art the baroque problem of testing circuit when the inductive current zero cross signal detected, and then simplification testing circuit structure, the effect that reduces production costs have been reached.
Fig. 2 is the synoptic diagram according to the power factor correction circuit of first embodiment of the invention, and as shown in Figure 2, the power factor correction circuit of this embodiment comprises: input end, output terminal, embodiment of the invention testing circuit that foregoing provides, on-off circuit and control circuit.
Wherein, the elementary windings in series of inductance is between the input end and output terminal of power factor correction circuit, and testing circuit is connected to first end of the secondary winding of inductance; On-off circuit is connected between the output terminal of second end of secondary winding of inductance and power factor correction circuit; Control circuit is connected respectively with on-off circuit with testing circuit, is used for control on-off circuit closure when testing circuit output high level signal, and the control on-off circuit disconnects when testing circuit output low level signal.
Particularly, control circuit among this embodiment can adopt digital signal processing DSP (Digital Signal Processor, be called for short DSP) circuit or microprocessor MCU (Micro programmed Control Unit, be called for short MCU), wherein, DSP or MCU are equivalent to the signal processor of the testing circuit that embodiment of the 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 behind the filtering circuit of current-limiting resistance R4 and filter capacitor C1 composition.When testing circuit output high level signal, control circuit DSP (or MCU) receives the current zero-crossing signal of inductance L, the gauge tap closing of circuit, on-off circuit inductance L of closed conduction period charging energy storage, testing circuit continues the output high level signal simultaneously, the gauge tap circuit disconnects after reaching preset value, inductance L began discharge and passed through diode D output voltage to load this moment, this testing circuit output low level signal simultaneously, finish this testing circuit outputs level signals until inductive discharge and become high level signal by low level signal again, after control circuit receives high level signal, on-off circuit conducting, so cycle control.
Preferably, the power factor correction circuit of the embodiment of the invention also comprises: voltage detecting circuit, be connected between the output terminal of the elementary winding of inductance L and power factor correction circuit, sparking voltage for detection of described inductance L, wherein, control circuit DSP (or MCU) is connected with voltage detecting circuit, when being used for sparking voltage in inductance L less than preset value, and the gauge tap closing of circuit.Enumerate explanation: the input voltage V of input end in power factor correction circuit
iBe 220V, the default output voltage values Vo of output terminal is 350V, when inductance L regular picture, the actual value of output voltage reaches 350V, this actual value can satisfy the required magnitude of voltage of power factor correction circuit, in order to guarantee inductance energy stored foot in producing reliable current zero-crossing signal, so, generally will
+ 20 magnitude of voltage is as preset value, when the sparking voltage of inductance L during less than preset value Vo big or small, and the gauge tap closing of circuit, be 200V such as input voltage, 200*1.414+20V=313V, if the sparking voltage of inductance L less than 313V, gauge tap closing of circuit then.
Because when the sparking voltage of inductance L during less than the predeterminated voltage value, though this moment, its sparking voltage was greater than zero, but less sparking voltage can not satisfy the demand of the output voltage of power factor correction circuit, by voltage detecting circuit is set, reached the effect of accurate control power factor correction circuit work.
Fig. 3 is the synoptic diagram according to the power factor correction circuit of second embodiment of the invention, as shown in Figure 3, power factor correction circuit among this embodiment and the difference of the power factor correction circuit in the first embodiment of the invention are: 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 first end of the secondary winding of inductance L, and be connected between DSP (or MCU) and the on-off circuit, at this moment, PFC Controller and DSP detect the current zero-crossing signal of inductance L, and DSP is disconnection or the closure that auxiliary PFC control finishes the gauge tap circuit.Also be, when testing circuit output high level signal, control circuit DSP (or MCU) and PFC control receive 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 inductance L of closed conduction period charging energy storage, testing circuit continues the output high level signal simultaneously, the gauge tap circuit disconnects after reaching preset value, inductance L began discharge and passed through diode D output voltage to load this moment, this testing circuit output low level signal simultaneously, finish this testing circuit outputs level signals until inductive discharge and become high level signal by low level signal again, after control circuit receives the inductive current zero cross signal, the on-off circuit conducting, so cycle control.
Because the chip in PFC Controller chip and the on-off circuit is when being connected, the matching degree of each pin is higher, form control circuit jointly by DSP (or MCU) and PFC Controller, the auxiliary PFC control of DSP finishes disconnection or the closure of gauge tap circuit, has reached the effect of optimizing power factor correction circuit.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the testing circuit of an inductive discharge electric current is characterized in that, comprising:
Input terminal is connected first end of the secondary winding of inductance (L), is used for gathering the discharge current of described inductance (L);
Direct supply;
Transistor, first end is connected in described input terminal, and second end is connected in described direct supply;
Lead-out terminal is connected in first node, and wherein, described first node is the node between described transistorized second end and the described direct supply; And
Signal processor is connected with described lead-out terminal, is used for judging according to the output signal of described lead-out terminal whether described discharge current is zero.
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 input terminal and described transistorized first end;
Second current-limiting resistance (R3) is connected between described first node and the described direct supply; And
The 3rd current-limiting resistance (R4) is connected between described first node and the described lead-out terminal.
3. testing circuit according to claim 1 is characterized in that, described testing circuit also comprises:
Isolating diode (D1) is connected between described input terminal and described first current-limiting resistance (R1);
Voltage stabilizing diode (ZD), first end is connected with described input terminal, the second end ground connection; And
Divider resistance (R2), first end are connected in described transistorized first end, the second end ground connection.
4. testing circuit according to claim 1 is characterized in that, described transistor is triode.
5. a power factor correction circuit is characterized in that, comprising:
Input end and output terminal;
Each described testing circuit in the claim 1 to 4, wherein, the elementary windings in series of described inductance (L) is between described input end and described output terminal, and described testing circuit is connected to first end of the secondary winding of described inductance (L);
On-off circuit is connected between second end and described output terminal of secondary winding of described inductance (L); And
Control circuit is connected respectively with described on-off circuit with described testing circuit, is used for controlling when described testing circuit output high level signal described on-off circuit closure, controls described on-off circuit and disconnect when described testing circuit output low level signal.
6. power factor correction circuit according to claim 5 is characterized in that, described control circuit comprises:
Controller, first end of described controller is connected in the input terminal of described testing circuit, second end of described controller is connected in the signal output part of the signal processor of described testing circuit, is used for whether the discharge current of the described inductance of reception (L) and the described discharge current of judging of described signal processor are zero signal.
7. power factor correction circuit according to claim 5 is characterized in that, described power factor correction circuit also comprises:
Voltage detecting circuit is connected between the elementary winding and described output terminal of inductance (L), for detection of the sparking voltage of described inductance (L),
Wherein, described control circuit is connected with described voltage detecting circuit, is used for during less than preset value, controlling described on-off circuit closure at described sparking voltage.
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| CN201210016923.7A CN103207302B (en) | 2012-01-17 | 2012-01-17 | The testing circuit of inductive discharge electric current and power factor correction circuit |
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| CN201210016923.7A CN103207302B (en) | 2012-01-17 | 2012-01-17 | The testing circuit of inductive discharge electric current and power factor correction circuit |
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| CN103207302B CN103207302B (en) | 2015-07-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113029397A (en) * | 2019-12-25 | 2021-06-25 | 财团法人工业技术研究院 | Piezoelectric sensing circuit and piezoelectric sensing system |
| US11411161B2 (en) | 2019-12-25 | 2022-08-09 | Industrial Technology Research Institute | Piezoelectric sensing system and piezoelectric sensing circuit |
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| CN103207302B (en) | 2015-07-29 |
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