CN203968000U - Output voltage is adjustable switching power source feedback circuit provided on a large scale - Google Patents
Output voltage is adjustable switching power source feedback circuit provided on a large scale Download PDFInfo
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- CN203968000U CN203968000U CN201420279299.4U CN201420279299U CN203968000U CN 203968000 U CN203968000 U CN 203968000U CN 201420279299 U CN201420279299 U CN 201420279299U CN 203968000 U CN203968000 U CN 203968000U
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Abstract
A kind of output voltage is adjustable switching power source feedback circuit provided on a large scale, relate to technical field of electricity, comprise an error amplifier UC3842, ground connection after the 1st pin of described error amplifier UC3842 inverting input and the 2nd pin parallel connection, on the 4th pin of described error amplifier UC3842 input, be parallel with adjustable resistance RT summation current transformer CT, the other end of described adjustable resistance RT is connected to the 8th pin of error amplifier UC3842, the 4th pin of described error amplifier UC3842 is connected to field effect transistor Q1, one end ground connection of described field effect transistor Q1, the other end of described Current Transmit is connected to the output of field effect transistor Q1, at input voltage fixedly in the situation that, its driving pulse duty ratio is constant, pulse frequency is determined by 4 pin RT/CT (adjustable resistance/current transformer) frequencies of oscillation.The utility model makes power work stable, has avoided the concussion that causes that because output voltage adjustable range is excessive switching tube duty ratio is excessive and then produce.
Description
Technical field
The utility model relates to technical field of electricity, is specifically related to a kind of output voltage adjustable switching power source feedback circuit provided on a large scale.
Background technology
In the special application field of electric power system, deciliter action request of circuit breaker is very high at present, and conventional circuit breaker cannot meet the requirement of load to circuit breaker responsiveness.Circuit-breaker switching on-off needs eddy-current disc to drive, and the energy of eddy-current disc is provided by power capacitor.For the circuit breaker of different application occasion, the power capacitor volume and the voltage that need are not identical yet.In order to improve applicability, require into its output voltage of flyback power supply of capacitor charging adjustable on a large scale.
The flyback electric power output voltage regulating circuit (as shown in Figure 1) of traditional UC3842, its output voltage adjustment process is: resistance → optocoupler input current → optocoupler output voltage → error amplifier anti-phase input (2 pin) voltage → change driving pulse duty ratio → change output voltage of adjusting and reforming potentiometer.But there is a problem in said process: when power input voltage is very little, the duty ratio of driving switch pipe pulse is very large, if now increase again duty ratio, improve output voltage, easily cause the concussion of Switching Power Supply, cause output unstable.
Utility model content
It is a kind of simple and practical that technical problem to be solved in the utility model is to provide, and the good output voltage of practical application effect is adjustable switching power source feedback circuit provided on a large scale.
Technical problem to be solved in the utility model realizes by the following technical solutions:
A kind of output voltage is adjustable switching power source feedback circuit provided on a large scale, comprise an error amplifier UC3842, ground connection after the 1st pin of described error amplifier UC3842 inverting input and the 2nd pin parallel connection, on the 4th pin of described error amplifier UC3842 input, be parallel with adjustable resistance RT summation current transformer CT, the other end of described adjustable resistance RT is connected to the 8th pin of error amplifier UC3842, the 4th pin of described error amplifier UC3842 is connected to field effect transistor Q1, one end ground connection of described field effect transistor Q1, the other end of described Current Transmit is connected to the output of field effect transistor Q1, at input voltage fixedly in the situation that, its driving pulse duty ratio is constant, pulse frequency is determined by 4 pin RT/CT frequencies of oscillation.
Its principle of stabilized voltage is: when output voltage is more than or equal to set point, and optocoupler conducting, field effect transistor Q1 conducting, is pulled to low level 4 pin, and 4 pin RT/CT vibrations disappear, and UC3842 blocks driving pulse, and output voltage declines; When output voltage is less than set point, optocoupler cut-off, field effect transistor Q1 cut-off, 4 pin RT/CT produce vibration, UC3842 output fixed frequency driving pulse, output voltage raises.That is to say as long as can realize the adjustable of output voltage on a large scale by regulator potentiometer, through actual test, even in the situation that input voltage is very little, still can keep stablizing of output voltage adjustable.
The beneficial effects of the utility model are:
1) power work is stable, has avoided the concussion that causes that because output voltage adjustable range is excessive switching tube duty ratio is excessive and then produce;
2), even in the situation that power input voltage is very low, also can realize the adjustable of output voltage on a large scale;
3) circuit structure is simple, increases hardly cost.
Accompanying drawing explanation
Fig. 1 is prior art voltage regulator circuit figure;
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
As shown in Figure 2, a kind of output voltage is adjustable switching power source feedback circuit provided on a large scale, comprise an error amplifier UC3842, ground connection after the 1st pin of error amplifier UC3842 inverting input and the 2nd pin parallel connection, on the 4th pin of described error amplifier UC3842 input, be parallel with adjustable resistance RT summation current transformer CT, the other end of described adjustable resistance RT is connected to the 8th pin of error amplifier UC3842, the 4th pin of described error amplifier UC3842 is connected to field effect transistor Q1, one end ground connection of described field effect transistor Q1, the other end of described Current Transmit is connected to the output of field effect transistor Q1, at input voltage fixedly in the situation that, its driving pulse duty ratio is constant, pulse frequency is determined by 4 pin RT/CT frequencies of oscillation.
Its principle of stabilized voltage is: when output voltage is more than or equal to set point, and optocoupler conducting, field effect transistor Q1 conducting, is pulled to low level 4 pin, and 4 pin RT/CT vibrations disappear, and UC3842 blocks driving pulse, and output voltage declines; When output voltage is less than set point, optocoupler cut-off, field effect transistor Q1 cut-off, 4 pin RT/CT produce vibration, UC3842 output fixed frequency driving pulse, output voltage raises.That is to say as long as can realize the adjustable of output voltage on a large scale by regulator potentiometer, through actual test, even in the situation that input voltage is very little, still can keep stablizing of output voltage adjustable.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. an output voltage adjustable switching power source feedback circuit provided on a large scale, comprise an error amplifier (UC3842), it is characterized in that: ground connection after the 1st pin of described error amplifier (UC3842) inverting input and the 2nd pin parallel connection, on the 4th pin of described error amplifier (UC3842) input, be parallel with adjustable resistance (RT) summation current transformer (CT), the other end of described adjustable resistance (RT) is connected to the 8th pin of error amplifier (UC3842), the 4th pin of described error amplifier (UC3842) is connected to field effect transistor (Q1), one end ground connection of described field effect transistor (Q1), the other end of described current transformer (CT) is connected to the output of field effect transistor (Q1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420279299.4U CN203968000U (en) | 2014-05-28 | 2014-05-28 | Output voltage is adjustable switching power source feedback circuit provided on a large scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420279299.4U CN203968000U (en) | 2014-05-28 | 2014-05-28 | Output voltage is adjustable switching power source feedback circuit provided on a large scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203968000U true CN203968000U (en) | 2014-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420279299.4U Active CN203968000U (en) | 2014-05-28 | 2014-05-28 | Output voltage is adjustable switching power source feedback circuit provided on a large scale |
Country Status (1)
| Country | Link |
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| CN (1) | CN203968000U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852612A (en) * | 2015-05-26 | 2015-08-19 | 中国神华能源股份有限公司 | Switching power supply based on UC3842 |
| CN106787634A (en) * | 2016-12-23 | 2017-05-31 | 杭州九阳小家电有限公司 | A kind of reduction disturbance power control method of household electrical appliance metal-oxide-semiconductor power regulation circuit |
-
2014
- 2014-05-28 CN CN201420279299.4U patent/CN203968000U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852612A (en) * | 2015-05-26 | 2015-08-19 | 中国神华能源股份有限公司 | Switching power supply based on UC3842 |
| CN106787634A (en) * | 2016-12-23 | 2017-05-31 | 杭州九阳小家电有限公司 | A kind of reduction disturbance power control method of household electrical appliance metal-oxide-semiconductor power regulation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170606 Address after: Songjiang District Minyi road 201612 Shanghai City No. 201 Building 1 Room 302 Patentee after: Shanghai Hekai Power Protection Equipment Co., Ltd. Address before: No. 28 Jinhua Avenue Shuangfeng Industrial Zone, Changfeng County of Hefei City, Anhui province 231100 Patentee before: Anhui Guoke Electric Power Equipment Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200306 Address after: 231100 Shuangfeng Road North 28, Shuangfeng Economic Development Zone, Changfeng County, Hefei, Anhui Patentee after: ANHUI HEKAI ELECTRIC TECHNOLOGY CO., LTD. Address before: Songjiang District Minyi road 201612 Shanghai City No. 201 Building 1 Room 302 Patentee before: Shanghai Hekai Power Protection Equipment Co., Ltd. |