CN109889051A - A kind of DCDC isolated power supply circuit - Google Patents
A kind of DCDC isolated power supply circuit Download PDFInfo
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- CN109889051A CN109889051A CN201910280233.4A CN201910280233A CN109889051A CN 109889051 A CN109889051 A CN 109889051A CN 201910280233 A CN201910280233 A CN 201910280233A CN 109889051 A CN109889051 A CN 109889051A
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Abstract
The invention belongs to electronic circuit technology fields, disclose a kind of DCDC isolated power supply circuit, circuit has positive-negative input end and positive-negative output end, comprising: transformer (T1), first resistor (R1), second resistance (R2), first capacitor (C1), the second capacitor (C2), third capacitor (C3), the first triode (Q1) and first diode (D1)；The present invention can simplify circuit structure, and reduce cost, suitable for small-sized DCDC circuit.
Description
Technical field
The invention belongs to electronic circuit technology field more particularly to a kind of DCDC isolated power supply circuits.
Background technique
Isolated power supply circuit is that module is commonly used in electronic system, in traditional scheme, PWM controller chip is mostly used to add instead
The characteristics of Switching Power Supply of current feed circuit composition, this circuit is that circuit structure is more complicated, and cost is relatively high, generally answers
With on powerful DCDC circuit.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of DCDC isolated power supply circuit, can simplify circuit structure, and drop
Low cost.
The embodiments of the present invention are implemented as follows:
A kind of DCDC isolated power supply circuit, circuit have positive-negative input end and positive-negative output end, comprising: transformer, first
Resistance, second resistance, first capacitor, the second capacitor, third capacitor, the first triode and first diode；
One end connection positive input terminal, one end of first capacitor and one end of first resistor of primary winding, transformation
The other end of device armature winding connects the collector of the first triode；
One end of transformer auxiliary winding connects the base stage of the first triode, the other end connection of transformer auxiliary winding the
One end of the other end of one resistance and the second capacitor, first capacitor other end connection negative input end, the second capacitor it is another
The emitter of outer one end and the first triode；
One end of transformer secondary output winding connects first diode, the other end connection third electricity of transformer secondary output winding
One end of appearance, one end of second resistance and negative output terminal, the other end of the other end connection third capacitor of first diode,
The other end and positive output end of second resistance.
The embodiment of the present invention is self-maintained circuit, rectifying and wave-filtering and by way of providing fictitious load, so that entire electricity
Road has isolation features, and at low cost, circuit structure is simplified, suitable for small-sized DCDC circuit.
Detailed description of the invention
Fig. 1 is isolation DC/DC power circuit principle figure of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Specific implementation of the invention is described in detail below in conjunction with specific embodiment:
A kind of DCDC isolated power supply circuit, circuit have positive-negative input end (VIN+, VIN-) and positive-negative output end (OUT+,
OUT-), comprising: transformer T1, first resistor R1, second resistance R2, first capacitor C1, the second capacitor C2, third capacitor C3,
One triode Q1 and first diode D1；
One end connection positive input terminal, one end of first capacitor and one end of first resistor of primary winding, transformation
The other end of device armature winding connects the collector of the first triode；
One end of transformer auxiliary winding connects the base stage of the first triode, the other end connection of transformer auxiliary winding the
One end of the other end of one resistance and the second capacitor, first capacitor other end connection negative input end, the second capacitor it is another
The emitter of outer one end and the first triode；
One end of transformer secondary output winding connects first diode, the other end connection third electricity of transformer secondary output winding
One end of appearance, one end of second resistance and negative output terminal, the other end of the other end connection third capacitor of first diode,
The other end and positive output end of second resistance.
Specifically as shown in Figure 1, one end connection VIN+ of primary winding Ta, one end of first capacitor C1 and the first electricity
One end of R1 is hindered, the other end of primary winding Ta connects the collector of the first triode Q1；One end of auxiliary winding Tb
Connect the base stage of the first triode Q1, the auxiliary winding Tb other end connects the other end and the second capacitor C2 of first resistor R1
One end, other end connection VIN-, the other end of the second capacitor C2 and the emitter of the first triode Q1 of first capacitor C1；
One end of secondary windings Tc connects first diode D1 (anode), and the one of the other end connection third capacitor C3 of secondary windings Tc
Other the one of other end (cathode) the connection third capacitor C3 at end, one end of second resistance R2 and OUT-, first diode D1
End, the other end of second resistance R2 and OUT+.
The working principle of circuit are as follows: armature winding Ta, auxiliary winding Tb, first resistor R1, the second capacitor C2 of transformer
Form self-maintained circuit with the first triode Q1, the sensibility reciprocal of frequency of oscillation and coil, the first triode Q1 switch time with
And the value of first resistor R1 and the second capacitor C2 is related, transformer secondary output winding is rectified by first diode D1, third
Capacitor C3 is filtered, and second resistance R2 regards a fictitious load, transformer core saturation when to prevent output loading being empty.Root
According to the difference of input voltage, adjustable above-mentioned parameter adjusts output voltage；By adjusting transformer line footpath, the parameters such as the number of turns can
Adjust the pressure voltage of input and output.The signal of transformer secondary output is come by primary coil coupling, electrically primary and secondary line
Circle is isolation, therefore realizes isolation features.This circuit structure is simple, at low cost, is suitble to produce in enormous quantities and be applied to existing
?.
In the embodiment of the present invention, in order to reduce cost, reduce the complexity of circuit, the present invention is directed to propose it is a kind of it is low at
This auto-excitation type isolation DC/DC power circuit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to restrict the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (1)
1. a kind of DCDC isolated power supply circuit, circuit has positive-negative input end and positive-negative output end characterized by comprising becomes
Depressor, first resistor, second resistance, first capacitor, the second capacitor, third capacitor, the first triode and first diode；
One end connection positive input terminal of primary winding, one end of first capacitor and one end of first resistor, at the beginning of transformer
The other end of grade winding connects the collector of the first triode；
One end of transformer auxiliary winding connects the base stage of the first triode, the first electricity of other end connection of transformer auxiliary winding
One end of the other end of resistance and the second capacitor, first capacitor other end connection negative input end, the second capacitor other one
The emitter at end and the first triode；
One end of transformer secondary output winding connects first diode, the other end connection third capacitor of transformer secondary output winding
One end, one end of second resistance and negative output terminal, the other end of the other end connection third capacitor of first diode, second
The other end and positive output end of resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910280233.4A CN109889051A (en) | 2019-04-04 | 2019-04-04 | A kind of DCDC isolated power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910280233.4A CN109889051A (en) | 2019-04-04 | 2019-04-04 | A kind of DCDC isolated power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109889051A true CN109889051A (en) | 2019-06-14 |
Family
ID=66936583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910280233.4A Pending CN109889051A (en) | 2019-04-04 | 2019-04-04 | A kind of DCDC isolated power supply circuit |
Country Status (1)
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| CN (1) | CN109889051A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024040537A1 (en) * | 2022-08-25 | 2024-02-29 | 华为数字能源技术有限公司 | Power converter and power source |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5225972A (en) * | 1991-03-20 | 1993-07-06 | Hiroshi Sakamoto | Power source |
| CN1186377A (en) * | 1996-12-24 | 1998-07-01 | 松下电工株式会社 | Electric power circuit |
| CN1351283A (en) * | 2000-10-27 | 2002-05-29 | 船井电机株式会社 | High voltage generator for color tuning system printer |
| CN101512885A (en) * | 2006-06-26 | 2009-08-19 | 巴特尔纪念研究院 | High voltage power supply |
| CN202713129U (en) * | 2012-05-31 | 2013-01-30 | 洛阳隆盛科技有限责任公司 | Accelerating oscillation starting circuit |
| CN105162330A (en) * | 2015-07-22 | 2015-12-16 | 航天长峰朝阳电源有限公司 | High-reliable large-power intelligent current-sharing power supply module |
-
2019
- 2019-04-04 CN CN201910280233.4A patent/CN109889051A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5225972A (en) * | 1991-03-20 | 1993-07-06 | Hiroshi Sakamoto | Power source |
| CN1186377A (en) * | 1996-12-24 | 1998-07-01 | 松下电工株式会社 | Electric power circuit |
| CN1351283A (en) * | 2000-10-27 | 2002-05-29 | 船井电机株式会社 | High voltage generator for color tuning system printer |
| CN101512885A (en) * | 2006-06-26 | 2009-08-19 | 巴特尔纪念研究院 | High voltage power supply |
| CN202713129U (en) * | 2012-05-31 | 2013-01-30 | 洛阳隆盛科技有限责任公司 | Accelerating oscillation starting circuit |
| CN105162330A (en) * | 2015-07-22 | 2015-12-16 | 航天长峰朝阳电源有限公司 | High-reliable large-power intelligent current-sharing power supply module |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024040537A1 (en) * | 2022-08-25 | 2024-02-29 | 华为数字能源技术有限公司 | Power converter and power source |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190614 |