CN107612354B - Self-excited oscillation circuit - Google Patents
Self-excited oscillation circuit Download PDFInfo
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- CN107612354B CN107612354B CN201710751770.3A CN201710751770A CN107612354B CN 107612354 B CN107612354 B CN 107612354B CN 201710751770 A CN201710751770 A CN 201710751770A CN 107612354 B CN107612354 B CN 107612354B
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Abstract
The invention relates to a self-oscillation circuit, comprising: the circuit comprises a first polarity capacitor, a second polarity capacitor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a voltage stabilizing diode, a voltage stabilizer, a first transistor, a second transistor, an MOS (metal oxide semiconductor) transistor and a double-winding transformer; the circuit can realize stable power supply of multiple groups, and the power supply power is not limited. The power supply has the advantages of low temperature rise and high efficiency, and the power supply can work more stably; the cost is reduced, and the cost performance of the power supply can be improved. Meanwhile, the self-oscillation circuit works in an intermittent mode, and the loss of a switching tube and a transformer is low. The circuit adopting the conventional resistor-capacitor and matched transistors saves the cost of an integrated IC.
Description
Technical Field
The invention relates to a self-oscillation circuit, in particular to a self-oscillation circuit capable of realizing simultaneous auxiliary power supply of multiple groups.
Background
The auxiliary power supply used by the existing power supply products is realized by using a step-down power supply IC. The working principle is as follows: the IC is powered by the circuit to stabilize the input voltage at a set voltage value through the BUCK circuit. Most of the current auxiliary power supply ICs are suitable for BUCK circuits, namely, only one stable voltage can be output, and multiple groups of power supply cannot be realized. At the same time, there is a cost increase in using integrated ICs.
Disclosure of Invention
In view of the above, there is a need for a self-oscillating circuit.
A self-oscillating circuit comprising: the circuit comprises a first polarity capacitor, a second polarity capacitor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a voltage stabilizing diode, a voltage stabilizer, a first transistor, a second transistor, an MOS (metal oxide semiconductor) transistor and a double-winding transformer;
one end of the first resistor is connected with a voltage input end, a third tap on the primary side of the double-winding transformer, one end of an eighth resistor and one end of a first capacitor, the other end of the first resistor is connected with one end of a second resistor, the negative electrode of a fourth diode, one end of a fourth capacitor and the negative electrode of a voltage stabilizer, the positive electrode of the voltage stabilizer is connected with one end of a seventh resistor, the other end of the fourth capacitor, the positive electrode of a voltage stabilizing diode, the second tap on the primary side of the double-winding transformer, the collector electrode of a first transistor, the emitter electrode of a second transistor, one end of the second capacitor and one end of the fourth resistor, the voltage input end of the voltage stabilizer is connected with the other end of the seventh resistor and one end of a sixth resistor, the other end of the sixth resistor is connected with a first output end, the positive electrode of the fourth diode is connected with the other end of the second resistor, The anode of a fifth diode, the cathode of a voltage stabilizing diode and the base of the first transistor, the cathode of the fifth diode is connected with the anode of a sixth diode, the cathode of the sixth diode is connected with the collector of the first transistor, the grid of an MOS tube, the other end of a second capacitor and the collector of a second transistor, the base of the second transistor is connected with one end of a third resistor, the other end of the third resistor is connected with the other end of a fourth resistor and the source of the MOS tube, the other end of the third capacitor is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with a first tap on the primary side of a double-winding transformer, the other end of an eighth resistor is connected with the other end of the first capacitor and the cathode of the third diode, the anode of the third diode is connected with the drain of the MOS tube and a fourth tap on the primary side of the double-winding transformer, the anode of the first diode is connected with a fourth tap on the secondary side of, the negative electrode of the second diode is connected with the positive electrode of the second polarity capacitor and serves as a first output end, the negative electrode of the second polarity capacitor is connected with a third secondary tap of the double-winding transformer, a first secondary tap of the double-winding transformer and the negative electrode of the first polarity capacitor, and is grounded, the positive electrode of the first diode is connected with a second secondary tap of the double-winding transformer, and the negative electrode of the first diode is connected with the positive electrode of the first polarity capacitor and serves as a second output end.
The first tap and the third tap of the primary side of the double-winding transformer are homonymous terminals, the second tap and the fourth tap of the primary side of the double-winding transformer are homonymous terminals, the first tap and the third tap of the secondary side of the double-winding transformer are homonymous terminals, and the second tap and the fourth tap of the secondary side of the double-winding transformer are homonymous terminals.
The invention has the beneficial effects that:
the invention provides a self-oscillation circuit which can realize stable power supply of multiple groups and is not limited in power supply power. The power supply has the advantages of low temperature rise and high efficiency, and the power supply can work more stably; the cost is reduced, and the cost performance of the power supply can be improved. Meanwhile, the self-oscillation circuit works in an intermittent mode, and the loss of a switching tube and a transformer is low. The circuit adopting the conventional resistor-capacitor and matched transistors saves the cost of an integrated IC.
Drawings
Fig. 1 is a circuit diagram of a self-oscillation circuit according to an embodiment of the present invention.
Detailed Description
The present invention provides a self-oscillation circuit, as shown in fig. 1, including: a first polarity capacitor CE1, a second polarity capacitor CE2, a first capacitor CE3, a second capacitor CE4, a third capacitor CE5, a fourth capacitor CE6, a first resistor RE1, a second resistor RE2, a third resistor RE3, a fourth resistor RE4, a fifth resistor RE5, a sixth resistor RE6, a seventh resistor RE7, an eighth resistor RE8, a first diode DE1, a second diode DE2, a third diode DE3, a fourth diode DE4, a fifth diode DE5, a sixth diode DE6, a zener diode DE7, a regulator U1, a first transistor QE1, a second transistor QE2, a MOS tube VE, and a two-winding transformer TE;
one end of the first resistor RE1 is connected to the voltage INPUT end INPUT, one end of the third primary tap 3 of the double-winding transformer TE, one end of the eighth resistor RE8 and one end of the first capacitor CE3, the other end of the first resistor RE1 is connected to one end of the second resistor RE2, the negative electrode of the fourth diode DE4, one end of the fourth capacitor CE6 and the cathode of the voltage stabilizer U1, the anode of the voltage stabilizer U1 is connected to one end of the seventh resistor RE7, the other end of the fourth capacitor CE6, the anode of the zener diode DE7, the second primary tap 2 of the double-winding transformer TE, the collector of the first transistor QE1, the emitter of the second transistor QE2, one end of the second capacitor CE4 and one end of the fourth resistor RE4, and are connected in parallel, the voltage INPUT end of the first resistor RE 573u 5 is connected to the other end of the seventh resistor RE7 and one end of the sixth resistor RE6, the other end of the sixth resistor RE6 is connected to the other end of the sixth resistor RE6, the first output end of the sixth resistor RE6 and the positive electrode 1 is, One end of a third capacitor CE5, an anode of a fifth diode DE5, a cathode of a zener diode DE7 and a base of a first transistor QE1, a cathode of the fifth diode DE5 is connected to an anode of a sixth diode DE6, a cathode of the sixth diode DE6 is connected to a collector of the first transistor QE1, a gate of the MOS transistor VE, the other end of the second capacitor CE4 and a collector of the second transistor QE2, a base of the second transistor QE2 is connected to one end of a third resistor RE3, the other end of the third resistor RE3 is connected to the other end of a fourth resistor RE4 and a source of the MOS transistor VE, the other end of the third capacitor CE5 is connected to one end of a fifth resistor RE5, the other end of the fifth resistor RE5 is connected to a first tap 1 of a primary side of a double winding transformer TE, the other end of the eighth resistor RE8 is connected to the other end of a drain of the first capacitor CE3 and a cathode of the third diode DE3, an anode of the third diode RE3 is connected to a primary side of the double winding TE 674 of the double winding transformer TE, the positive electrode of the second diode DE2 is connected to the secondary fourth tap 5 of the double-winding transformer TE, the negative electrode of the second diode DE2 is connected to the positive electrode of the second polarity capacitor CE2 and serves as a first output end OUT1, the negative electrode of the second polarity capacitor CE2 is connected to the secondary third tap 6 of the double-winding transformer TE, the secondary first tap 8 of the double-winding transformer TE and the negative electrode of the first polarity capacitor CE1, and is grounded, the positive electrode of the first diode DE1 is connected to the secondary second tap 7 of the double-winding transformer TE, and the negative electrode of the first diode DE1 is connected to the positive electrode of the first polarity capacitor CE1 and serves as a second output end OUT 2.
In this embodiment, when the voltage INPUT terminal INPUT + is turned on, a voltage is started for the MOS transistor VE through the first resistor RE1 and the second resistor RE2, the MOS transistor VE conducts the inductor to store energy, the primary side first tap 1, the primary side second tap 2, the primary side third tap 3, and the primary side fourth tap 4 of the dual-winding transformer TE are turned on, the secondary side fourth tap 5, the secondary side third tap 6, the secondary side second tap 7, and the secondary side first tap 8 of the dual-winding transformer TE are turned off, and at this time, the third capacitor CE5 is turned on to provide a control current for the first transistor QE1 and the MOS transistor VE to continuously conduct the voltage VE.
When the inductor stores energy to saturation, the current of the third capacitor CE5 is reduced to cause the first transistor QE1 to be turned on so that the MOS transistor VE is turned off, and the secondary fourth tap 5, the secondary third tap 6, the secondary second tap 7 and the secondary first tap 8 of the double-winding transformer TE release energy. And when the secondary winding energy release of the secondary side fourth tap 5, the secondary side third tap 6, the secondary side second tap 7 and the secondary side first tap 8 of the double-winding transformer TE is finished, repeating the working mode.
In this embodiment, the voltage regulator U1 is CJ431, and only takes part in the operation when the output voltage of OUT1 exceeds the set voltage, and does not necessarily take part in each operation period, when OUT1 exceeds the set voltage, the G-voltage of the CJ431 turning on the MOS transistor VE is pulled down to make the MOS transistor VE in the off state, and when the voltage of OUT1 is lower than the set voltage, the above operation is repeated.
The primary side first tap 1 and the primary side third tap 3 of the double-winding transformer are homonymous terminals, the primary side second tap 2 and the primary side fourth tap 4 of the double-winding transformer are homonymous terminals, the secondary side first tap 8 and the secondary side third tap 6 of the double-winding transformer are homonymous terminals, and the secondary side second tap 7 and the secondary side fourth tap 5 of the double-winding transformer are homonymous terminals.
In the embodiment, a self-oscillation circuit is applied to LED lighting driving, a flyback topology structure is adopted, and multiple groups of stable power supply are realized by adding a power supply winding of a transformer. The external MOS is properly selected according to the actual power. The self-oscillation circuit works in a discontinuous mode, and the loss of a switching tube and the transformer is low.
The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (2)
1. A self-oscillating circuit characterized by: the method comprises the following steps: the circuit comprises a first polarity capacitor, a second polarity capacitor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a voltage stabilizing diode, a voltage stabilizer, a first transistor, a second transistor, an MOS (metal oxide semiconductor) transistor and a double-winding transformer;
one end of the first resistor is connected with a voltage input end, a third tap on the primary side of the double-winding transformer, one end of an eighth resistor and one end of a first capacitor, the other end of the first resistor is connected with one end of a second resistor, the negative electrode of a fourth diode, one end of a fourth capacitor and the negative electrode of a voltage stabilizer, the positive electrode of the voltage stabilizer is connected with one end of a seventh resistor, the other end of the fourth capacitor, the positive electrode of a voltage stabilizing diode, the second tap on the primary side of the double-winding transformer, the collector electrode of a first transistor, the emitter electrode of a second transistor, one end of the second capacitor and one end of the fourth resistor, the voltage input end of the voltage stabilizer is connected with the other end of the seventh resistor and one end of a sixth resistor, the other end of the sixth resistor is connected with a first output end, the positive electrode of the fourth diode is connected with the other end of the second resistor, The anode of a fifth diode, the cathode of a voltage stabilizing diode and the base of the first transistor, the cathode of the fifth diode is connected with the anode of a sixth diode, the cathode of the sixth diode is connected with the collector of the first transistor, the grid of an MOS (metal oxide semiconductor) transistor, the other end of a second capacitor and the collector of a second transistor, the base of the second transistor is connected with one end of a third resistor, the other end of the third resistor is connected with the other end of a fourth resistor and the source of the MOS transistor, the other end of the third capacitor is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with a first tap on the primary side of a double-winding transformer, the other end of an eighth resistor is connected with the other end of the first capacitor and the cathode of the third diode, the anode of the third diode is connected with the drain of the MOS transistor and a fourth tap on the primary side of the double-winding transformer, the anode of the second diode is connected with a fourth tap, the negative electrode of the second diode is connected with the positive electrode of the second polarity capacitor and serves as a first output end, the negative electrode of the second polarity capacitor is connected with a third secondary tap of the double-winding transformer, a first secondary tap of the double-winding transformer and the negative electrode of the first polarity capacitor, and is grounded, the positive electrode of the first diode is connected with a second secondary tap of the double-winding transformer, and the negative electrode of the first diode is connected with the positive electrode of the first polarity capacitor and serves as a second output end;
the voltage stabilizer is CJ 431.
2. A self-oscillation circuit according to claim 1, wherein the first tap on the primary side and the third tap on the primary side of the double-winding transformer are homonymous terminals, the second tap on the primary side and the fourth tap on the primary side of the double-winding transformer are homonymous terminals, the first tap on the secondary side and the third tap on the secondary side of the double-winding transformer are homonymous terminals, and the second tap on the secondary side and the fourth tap on the secondary side of the double-winding transformer are homonymous terminals.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710751770.3A CN107612354B (en) | 2017-08-28 | 2017-08-28 | Self-excited oscillation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710751770.3A CN107612354B (en) | 2017-08-28 | 2017-08-28 | Self-excited oscillation circuit |
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| CN107612354A CN107612354A (en) | 2018-01-19 |
| CN107612354B true CN107612354B (en) | 2020-01-07 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6137695A (en) * | 1998-01-06 | 2000-10-24 | Murata Manufacturing Co., Ltd. | Self-oscillation type switching power supply and method |
| US6404654B1 (en) * | 2001-06-26 | 2002-06-11 | Jue Wang | Self-oscillation type resonant flyback converter utilizing charge stored effect of the P-N diode |
| US6480401B2 (en) * | 2001-03-13 | 2002-11-12 | Astec International Limited | Method and apparatus for reducing standby power in power supplies |
| CN101453169A (en) * | 2008-12-02 | 2009-06-10 | 广州金升阳科技有限公司 | Self-oscillation starting output end controlled anti exciting converter |
| CN201336746Y (en) * | 2008-05-05 | 2009-10-28 | 汤征宁 | Constant current and voltage drive circuit for AC power supply LED |
| CN101656484A (en) * | 2008-07-01 | 2010-02-24 | 技领半导体(上海)有限公司 | Three-pin package constant current and voltage controller in critical conduction mode |
| CN106575915A (en) * | 2014-09-12 | 2017-04-19 | 飞利浦照明控股有限公司 | Power supply circuits |
| CN206180881U (en) * | 2016-10-10 | 2017-05-17 | 成都市壹艺工艺品有限公司 | Pottery art drying equipment's circulation oscillation mode power supply circuit for temperature control system |
-
2017
- 2017-08-28 CN CN201710751770.3A patent/CN107612354B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6137695A (en) * | 1998-01-06 | 2000-10-24 | Murata Manufacturing Co., Ltd. | Self-oscillation type switching power supply and method |
| US6480401B2 (en) * | 2001-03-13 | 2002-11-12 | Astec International Limited | Method and apparatus for reducing standby power in power supplies |
| US6404654B1 (en) * | 2001-06-26 | 2002-06-11 | Jue Wang | Self-oscillation type resonant flyback converter utilizing charge stored effect of the P-N diode |
| CN201336746Y (en) * | 2008-05-05 | 2009-10-28 | 汤征宁 | Constant current and voltage drive circuit for AC power supply LED |
| CN101656484A (en) * | 2008-07-01 | 2010-02-24 | 技领半导体(上海)有限公司 | Three-pin package constant current and voltage controller in critical conduction mode |
| CN101453169A (en) * | 2008-12-02 | 2009-06-10 | 广州金升阳科技有限公司 | Self-oscillation starting output end controlled anti exciting converter |
| CN106575915A (en) * | 2014-09-12 | 2017-04-19 | 飞利浦照明控股有限公司 | Power supply circuits |
| CN206180881U (en) * | 2016-10-10 | 2017-05-17 | 成都市壹艺工艺品有限公司 | Pottery art drying equipment's circulation oscillation mode power supply circuit for temperature control system |
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| CN107612354A (en) | 2018-01-19 |
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Effective date of registration: 20200812 Address after: 528400 3rd floor, 1st floor and 3rd floor, building a, No. 5, Futian 10th Road, Gangkou Town, Zhongshan City, Guangdong Province Patentee after: Guangdong Mingfeng Power Technology Co., Ltd Address before: 528447 Guangdong city in Zhongshan Province town of Wood River straight port Street No. 16 Patentee before: GUANGDONG MINGFIRST POWER INDUSTRIAL Co.,Ltd. |