CN201654117U - Novel zero crossing detection circuit - Google Patents
Novel zero crossing detection circuit Download PDFInfo
- Publication number
- CN201654117U CN201654117U CN2010203005663U CN201020300566U CN201654117U CN 201654117 U CN201654117 U CN 201654117U CN 2010203005663 U CN2010203005663 U CN 2010203005663U CN 201020300566 U CN201020300566 U CN 201020300566U CN 201654117 U CN201654117 U CN 201654117U
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- integrated circuit
- zero crossing
- crossing detection
- zero point
- winding
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Abstract
The utility model discloses a novel zero crossing detection circuit, in the technical scheme, a stabilivolt (Z1), a capacitor (C1) and a first resistor (R1) are connected in parallel, the anode side of a parallel branch is connected with the upper end of a zero crossing detection winding (L1), and the cathode side of the parallel branch is connected with one end of a second resistor (R2); the lower end of the zero crossing detection winding (L1) is connected with a reference ground (GND) of an integrated circuit (IC); the other end of the second resistor (R2) is connected with the zero crossing detection (ZCD) end of the integrated circuit (IC); and the cathode of a diode (D1) is connected with the zero crossing detection (ZCD) end of the integrated circuit (IC), and the anode of the diode (D1) is connected with the reference ground (GND) of the integrated circuit (IC). The utility model improves the effective voltage of zero crossing detection, so that the problem of bad power factor correction (PFC) effect is solved.
Description
Technical field
The present invention relates in power factor correction (PFC) device of critical conduction mode the method that detect the zero point of inductor winding voltage.
Background technology
The power factor correction of critical conduction mode (PFC) device can be realized the effect that input current waveform and input voltage are synchronous, improves utilization rate of electrical.The power factor correction of this critical conduction mode (PFC) circuit has higher efficient, but needs a zero-detection circuit.
Traditional method is with reference to figure one, and the connected mode of prior art is the test side at zero point that resistance (R2) end connects integrated circuit, and the other end connects the upper end of detecting winding zero point; The lower end of detecting winding zero point then is connected to the reference ground (GND) of integrated circuit.
The principle of foregoing circuit is to utilize the electromagnetic induction of the winding that detects zero point to realize detecting zero point, after the effective voltage of this winding drops to the threshold voltage of integrated circuit detection at zero point, triggers the other parts work of integrated circuit.The defective of this kind mode is, when the input voltage of power factor correction (PFC) circuit and output voltage near the time, the effective voltage of the electromagnetic induction of the winding that detect zero point can be reduced to below the threshold values of integrated circuit, make the integrated circuit (IC) can't operate as normal, thereby influenced the effect of power factor correction (PFC).
Summary of the invention
The objective of the invention is, solve when the input voltage of power factor correction (PFC) circuit and output voltage near the time, the problem of power factor correction (PFC) poor effect.
To achieve these goals, the present invention includes:
Stabilivolt (Z1), electric capacity (C1) and first resistance (R1) parallel connection, the anode-side of this parallel branch connects the upper end of detecting winding (L1) zero point, and the cathode side of this parallel branch connects an end of second resistance (R2);
The lower end of detecting winding (L1) zero point connects the reference ground (GND) of integrated circuit (IC);
Second resistance (R2) other end connects detection at zero point (ZCD) end of integrated circuit (IC);
The negative electrode of diode (D1) is connected and detects (ZCD) end the zero point of integrated circuit (IC), and the anode of diode (D1) is connected the reference ground (GND) of integrated circuit (IC);
Description of drawings
Fig. 1: prior art
Fig. 2: first embodiment of the invention circuit diagram
Fig. 3: the first embodiment state 1
Fig. 4: the first embodiment state 2
Fig. 5: second embodiment of the invention circuit diagram
Embodiment
Fig. 2 first embodiment of the invention, its principle is:
The polarity of voltage that detects winding (L1) when zero point is for just going up down when negative, with reference to 3: the first embodiment states 1 of figure;
Electric current passes through the anode of diode (D1) to negative electrode, and second resistance (R2) of flowing through is given electric capacity (C1) charging, and the polarity of charging is that the positive right side, a left side is negative,
The polarity of voltage that detects winding (L1) when zero point is changed into when negative just down, with reference to 4: the first embodiment states 2 of figure;
Detect the voltage addition of the voltage and the electric capacity (C1) of winding (L1) zero point, detect (ZCD) end zero point above-mentioned two voltages and that work together to integrated circuit, be equivalent to improve the effective voltage that detects zero point, solve thus when the input voltage of power factor correction (PFC) circuit and output voltage near the time, the problem of power factor correction (PFC) poor effect.
The stabilivolt (Z1) in parallel with electric capacity (C1) act as the voltage at limiting capacitance (C1) two ends, and first resistance (R1) effect in parallel with electric capacity (C1) is to discharge to electric capacity (C1).
Fig. 5: second embodiment of the invention circuit diagram
Be connected and detect (ZCD) end zero point with the time when IC interior is provided with voltage stabilizing diode with reference to ground (GND) end, can be reduced to present embodiment by first embodiment, promptly be connected and detect (ZCD) end zero point with reference to ground (GND) end the time when IC interior is provided with voltage stabilizing diode, diode (D1) and stabilivolt (Z1) can omit.
The principle of work of present embodiment is identical with first embodiment of the invention.
Below only being that certain specific embodiment is specifically introduced, is not that the present invention is done any type of restriction, and any those skilled in the art all can utilize said method and content to make multiple change, conversion, still belong in the scope of technical solution of the present invention.
Claims (1)
1. a novel zero-detection circuit is characterized in that,
Stabilivolt (Z1), electric capacity (C1) and first resistance (R1) parallel connection, the anode-side of this parallel branch connects the upper end of detecting winding (L1) zero point, and the cathode side of this parallel branch connects an end of second resistance (R2);
Detect the reference ground (GND) that winding (L1) lower end connects integrated circuit (IC) zero point;
Second resistance (R2) other end connects detection at zero point (ZCD) end of integrated circuit (IC);
The negative electrode of diode (D1) is connected and detects (ZCD) end the zero point of integrated circuit (IC), and the anode of diode (D1) is connected the reference ground (GND) of integrated circuit (IC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010203005663U CN201654117U (en) | 2010-01-13 | 2010-01-13 | Novel zero crossing detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010203005663U CN201654117U (en) | 2010-01-13 | 2010-01-13 | Novel zero crossing detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201654117U true CN201654117U (en) | 2010-11-24 |
Family
ID=43119362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010203005663U Expired - Fee Related CN201654117U (en) | 2010-01-13 | 2010-01-13 | Novel zero crossing detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201654117U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759108A (en) * | 2016-04-27 | 2016-07-13 | 深圳大学 | Circuit for improving reliability of zero-voltage detection loop of CRM PFC and electronic equipment |
-
2010
- 2010-01-13 CN CN2010203005663U patent/CN201654117U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759108A (en) * | 2016-04-27 | 2016-07-13 | 深圳大学 | Circuit for improving reliability of zero-voltage detection loop of CRM PFC and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20130113 |