CN106787715B - Self-excitation type voltage reduction circuit - Google Patents
Self-excitation type voltage reduction circuit Download PDFInfo
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- CN106787715B CN106787715B CN201710018529.XA CN201710018529A CN106787715B CN 106787715 B CN106787715 B CN 106787715B CN 201710018529 A CN201710018529 A CN 201710018529A CN 106787715 B CN106787715 B CN 106787715B
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- triode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Amplifiers (AREA)
Abstract
The utility model provides a self-excited voltage-reducing circuit, includes diode D1, darlington pipe, triode Q4, triode Q5, inductance L1, triode Q3, diode D5, the electric capacity C3 and the C4 of being connected with the output of being connected with the input, diode D1 negative pole is connected with the projecting pole of darlington pipe, still is connected with triode Q4's base, triode Q5's collecting electrode respectively through resistance R1, triode Q4's collecting electrode is connected with the base of darlington pipe through resistance R3, still is connected with triode Q5's base through electric capacity C2, diode D4. The self-excited voltage reduction circuit increases the output current capability by adopting the Darlington tube, protects the output current by forming the output current limiting circuit by the resistor R5, the resistor R6, the resistor R7 and the triode Q3, has simple and reliable circuit structure and low cost, and further improves the working efficiency of the voltage reduction circuit and the stability of the output voltage.
Description
Technical Field
The invention relates to the field of voltage reduction circuits, in particular to a self-excited voltage reduction circuit.
Background
The voltage reduction circuit is a basic DC/DC converter and is widely applied to various power supply circuits. At present, a voltage reduction circuit is needed in many circuits, but the input voltage of a general voltage reduction circuit is low, the output voltage is not stable enough, the working efficiency is low, and the structure is complex.
Disclosure of Invention
In order to solve the problems, the invention provides a self-excited voltage reduction circuit which is simple in structure and stable in output voltage.
In order to realize the purpose, the invention adopts the technical scheme that: the utility model provides a self-excited step-down circuit, includes diode D1, darlington pipe, triode Q4, triode Q5, inductance L1, triode Q3, diode D5, the electric capacity C3 and the C4 of being connected with the output of being connected with the input, diode D1 negative pole is connected with the projecting pole of darlington pipe, still is connected with triode Q4's base, triode Q5's collecting electrode respectively through resistance R1, triode Q4's collecting electrode passes through resistance R3 and is connected with the base of darlington pipe, still passes through electric capacity C2, diode D4 and is connected with triode Q5's base, triode Q5's base passes through resistance R4 and is connected with its projecting pole, the base of darlington pipe passes through resistance R2 and is connected with its projecting pole, the collecting electrode of darlington pipe is connected with inductance L1, the inductance L1 other end is connected with triode Q3's projecting pole, still passes through resistance R5 and is connected with the output, triode Q3's collecting electrode passes through resistance R7 and is connected with diode D4's positive pole, diode Q3's base and diode D5 negative pole are connected the positive pole is connected with positive pole of electric capacity C3, positive pole and positive pole C4, positive pole is connected the positive pole of electric capacity C3, positive pole is connected with the emitting pole is connected.
Specifically, the cathode of the diode D1 is further connected to the GND terminal through a capacitor C1, the collector of the darlington tube is further connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the GND terminal.
Specifically, the triode Q4 and the triode Q5 are both NPN-type triodes, the triode Q3 is a PNP-type triode, and the diode D5 is a zener diode D5.
Specifically, the darlington tube comprises an NPN triode Q1 and an NPN triode Q2, wherein a base of the triode Q1 is connected with an emitter of the triode Q2, and a collector of the triode Q1 is connected with a collector of the triode Q2.
The invention has the beneficial effects that: the self-excited voltage reduction circuit increases the output current capability by adopting the Darlington tube, protects the output current by forming the output current limiting circuit by the resistor R5, the resistor R6, the resistor R7 and the triode Q3, has simple and reliable circuit structure and low cost, and further improves the working efficiency of the voltage reduction circuit and the stability of the output voltage.
Drawings
Fig. 1 is a circuit schematic of the present invention.
Detailed Description
Referring to fig. 1, the present invention relates to a self-excited voltage-reducing circuit, which includes a diode D1, a darlington tube, a transistor Q4, a transistor Q5, an inductor L1, a transistor Q3, a diode D5, and capacitors C3 and C4 connected to an output terminal, wherein a cathode of the diode D1 is connected to an emitter of the darlington tube, and is also connected to a base of the transistor Q4 and a collector of the transistor Q5 through a resistor R1, respectively, a collector of the transistor Q4 is connected to the base of the darlington tube through a resistor R3, and is also connected to a base of the transistor Q5 through a capacitor C2 and a diode D4, a base of the transistor Q5 is connected to an emitter thereof through a resistor R4, the base of darlington pipe passes through resistance R2 and is connected rather than the projecting pole, the collecting electrode of darlington pipe is connected with inductance L1, the inductance L1 other end is connected with triode Q3's projecting pole, still is connected with the output through resistance R5, triode Q3's collecting electrode passes through resistance R7 and is connected with diode D4's positive pole, triode Q3's base is connected with diode D5's negative pole, diode D5's negative pole is connected with the output, and the positive pole passes through resistance R8 and is connected with diode D4's positive pole, electric capacity C3 is anodal, electric capacity C4's positive pole all is connected with the output, triode Q5's projecting pole, triode Q4's projecting pole, electric capacity C3's negative pole, electric capacity C4's negative pole all are connected with the GND end.
Compared with the prior art, the self-excited voltage reduction circuit increases the output current capability by adopting the Darlington tube, and protects the output current by forming the output current limiting circuit by the resistor R5, the resistor R6, the resistor R7 and the triode Q3.
Specifically, the cathode of the diode D1 is further connected to the GND terminal through a capacitor C1, the collector of the darlington tube is further connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the GND terminal.
Specifically, the triode Q4 and the triode Q5 are both NPN-type triodes, the triode Q3 is a PNP-type triode, and the diode D5 is a zener diode D5.
Specifically, the darlington tube comprises an NPN triode Q1 and an NPN triode Q2, the base electrode of the triode Q1 is connected with the emitting electrode of the triode Q2, and the collecting electrode of the triode Q1 is connected with the collecting electrode of the triode Q2.
The present invention will be further illustrated by the following specific examples.
The working principle of the self-excited voltage reduction circuit of the specific embodiment is as follows: when the input end is connected with a power supply, input voltage provides base current for the triode Q4 through the diode D1 and the resistor R1 which are input for preventing reverse connection, so that the triode Q4 is conducted, then current is provided for the base of the Darlington tube through the resistor R3, the Darlington tube is fully conducted, part of current of the collector electrode of the Darlington tube charges the output capacitors C3 and C4 through the inductor L1 to supply a load, and part of current is stored in the inductor L1; when the voltages at the two ends of the output capacitors C3 and C4 exceed the breakdown voltage of the voltage stabilizing diode D5, the triode Q5 is conducted, the triode Q4 is cut off due to the fact that the collector of the triode Q5 is pulled down to the GND end, the potential of the base electrode of the Darlington tube is raised, the potential of the upper end of the capacitor C2 is rapidly raised, and the potential of the lower end of the capacitor C2 is also rapidly raised due to the fact that charges at the two ends of the capacitor C2 cannot be suddenly changed, so that the conduction of the triode Q5 is accelerated in a positive feedback mode, the potential of the base electrode of the Darlington tube is rapidly raised to be cut off due to the fact that the transistors Q4 are cut off, and after the Darlington tube is cut off, the current stored in the inductor L1 is released to a load through the freewheeling diode D3 or charges the output capacitors C3 and C4; when the voltage across the output capacitors C3 and C4 is lower than the breakdown voltage of the zener diode D5, the transistor Q5 is turned off and the next cycle begins.
The adjusting tube of the embodiment adopts a Darlington tube, the output current capacity is increased through the Darlington tube, the adjusting tube can be replaced by a MOSFET field effect tube in a large-current occasion, and the capacitor C2 is a positive feedback capacitor and can adjust the switching frequency; the resistors R5, R6 and R7 and the triode Q3 form an output current limiting circuit, when the value of the output current multiplied by the resistor R5 is larger than the threshold voltage of the switching-on of the triode Q3, the triode Q3 is switched on, the output voltage enables the triode Q5 to be switched on through the resistor R7, the triode Q4 is cut off, and then the Darlington tube is switched off, so that the output current limiting effect is achieved.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.
Claims (4)
1. A self-excited voltage reduction circuit is characterized in that: include diode D1, darlington pipe, triode Q4, triode Q5, inductance L1, triode Q3, diode D5, the electric capacity C3 and the C4 of being connected with the output of being connected with the input, diode D1 negative pole is connected with the projecting pole of darlington pipe, still through resistance R1 respectively with triode Q4's base, triode Q5's collecting electrode is connected, triode Q4's collecting electrode passes through resistance R3 and is connected with the base of darlington pipe, still through electric capacity C2, diode D4 is connected with triode Q5's base, triode Q5's base passes through resistance R4 and is connected with its projecting pole, darlington pipe's base passes through resistance R2 and is connected with its projecting pole, darlington pipe's collecting electrode is connected with inductance L1, the inductance L1 other end is connected with triode Q3's projecting pole, still passes through resistance R5 and is connected with the output, triode Q3's collecting electrode passes through resistance R7 and is connected with diode D4's base, triode Q3's positive pole is connected with diode D5's negative pole, positive pole C4 is connected with positive pole C3, positive pole C4 and positive pole C4, positive pole are connected.
2. A self-excited voltage step-down circuit as claimed in claim 1, wherein: the cathode of the diode D1 is connected with the GND end through a capacitor C1, the collector of the Darlington tube is connected with the cathode of the diode D3, and the anode of the diode D3 is connected with the GND end.
3. A self-excited voltage step-down circuit as claimed in claim 1, wherein: the triode Q4 and the triode Q5 are both NPN type triodes, the triode Q3 is a PNP type triode, and the diode D5 is a voltage stabilizing diode D5.
4. A self-excited voltage step-down circuit as claimed in claim 1, wherein: the Darlington tube comprises an NPN triode Q1 and an NPN triode Q2, the base electrode of the triode Q1 is connected with the emitting electrode of the triode Q2, and the collecting electrode of the triode Q1 is connected with the collecting electrode of the triode Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710018529.XA CN106787715B (en) | 2017-01-11 | 2017-01-11 | Self-excitation type voltage reduction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710018529.XA CN106787715B (en) | 2017-01-11 | 2017-01-11 | Self-excitation type voltage reduction circuit |
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| Publication Number | Publication Date |
|---|---|
| CN106787715A CN106787715A (en) | 2017-05-31 |
| CN106787715B true CN106787715B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710018529.XA Active CN106787715B (en) | 2017-01-11 | 2017-01-11 | Self-excitation type voltage reduction circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877532A (en) * | 2010-06-28 | 2010-11-03 | 浙江工业大学 | Bipolar transistor auto-excitation type Buck convertor |
| CN101976938A (en) * | 2010-09-20 | 2011-02-16 | 石家庄国耀电子科技有限公司 | Stable and reliable-operation heavy-current low-pressure drop one-way conducting circuit |
| WO2011045097A1 (en) * | 2009-09-21 | 2011-04-21 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement for operating at least one led |
| CN202014080U (en) * | 2011-02-28 | 2011-10-19 | 深圳硕日新能源科技有限公司 | Short circuit protection circuit of light-emitting diode (LED) constant current source |
| CN104052279A (en) * | 2011-11-22 | 2014-09-17 | 浙江工业大学 | Self-excited Sepic converter based on MOSFET |
-
2017
- 2017-01-11 CN CN201710018529.XA patent/CN106787715B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011045097A1 (en) * | 2009-09-21 | 2011-04-21 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement for operating at least one led |
| CN101877532A (en) * | 2010-06-28 | 2010-11-03 | 浙江工业大学 | Bipolar transistor auto-excitation type Buck convertor |
| CN101976938A (en) * | 2010-09-20 | 2011-02-16 | 石家庄国耀电子科技有限公司 | Stable and reliable-operation heavy-current low-pressure drop one-way conducting circuit |
| CN202014080U (en) * | 2011-02-28 | 2011-10-19 | 深圳硕日新能源科技有限公司 | Short circuit protection circuit of light-emitting diode (LED) constant current source |
| CN104052279A (en) * | 2011-11-22 | 2014-09-17 | 浙江工业大学 | Self-excited Sepic converter based on MOSFET |
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| Publication number | Publication date |
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| CN106787715A (en) | 2017-05-31 |
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