CN2113513U - Adjustable voltage-stabilizing dc power supply - Google Patents
Adjustable voltage-stabilizing dc power supply Download PDFInfo
- Publication number
- CN2113513U CN2113513U CN 92211311 CN92211311U CN2113513U CN 2113513 U CN2113513 U CN 2113513U CN 92211311 CN92211311 CN 92211311 CN 92211311 U CN92211311 U CN 92211311U CN 2113513 U CN2113513 U CN 2113513U
- Authority
- CN
- China
- Prior art keywords
- filter capacitor
- rectifier circuit
- resistance
- output terminal
- bridge rectifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses an adjustable DC voltage-stabilizing power supply, which comprises a step down transformer, a bridge rectifier circuit which is connected with the secondary coil of the transformer, a filter capacitor which is connected with the output end of the rectifier circuit and a three-terminal voltage stabilizer. The utility model is characterized in that the control end of the three-terminal voltage stabilizer is connected with a multi-grade toggle switch; the negative pole of a rectifying filter circuit is connected with a plurality of resistors with resistance, which are connected in parallel; each of the resistors can separately be connected with the control end of the three-terminal voltage stabilizer by adjusting the toggle switch; therefore, needed value of voltage is output.
Description
The utility model belongs to the device technique field that irreversible AC power input is transformed to DC power output, specifically a kind of direct supply that is used for compact electric apparatus.
The conventional DC power supply that now is used for small household appliance, its structure are to adjust output voltage, the very big direct current of output ripple composition behind the bridge rectifier capacitor filtering by the mode that changes the transformer secondary output tap.When this direct supply was used for radio cassette player, AC noise was very big.And utilize the direct supply of three terminal regulator, and low non-adjustable of cost, adjustable cost is higher.
The purpose of this utility model provides the low adjustable constant voltage dc source of a kind of cost.
The utlity model has a step-down transformer, on the secondary coil of this transformer, be connected with bridge rectifier circuit, the output terminal of bridge rectifier circuit is connected with filter capacitor, one end of this filter capacitor also is connected with the input end of a three terminal regulator, be connected with a feedback resistance between the output terminal of three terminal regulator and the control end, output terminal at three terminal regulator also is connected with a filter capacitor, control end at three terminal regulator connects many grades of toggle switches, end in addition at that filter capacitor that is connected the bridge rectifier circuit output terminal is connected with a plurality of resistance in parallel, and each resistance can be electrically connected with the control end of three terminal regulator separately by many grades of toggle switches.
The many grades of toggle switches that the utility model utilization is connected with the three terminal regulator control end were realized regulating with cooperating of a plurality of resistance, the a plurality of taps of transformer have been saved, production technology is simple, cost of manufacture is low, precision of voltage regulation height, scope are wide, output ripple rejection ratio height, volume is little, is particularly suitable for and the small household appliance adapted.
Accompanying drawing shows electrical schematic diagram of the present utility model.
In the embodiment that accompanying drawing provides, step-down transformer T selects elementary input 220V for use, and secondary output 12.5V, power are the miniature transformer of 6W, secondarily the level coil output diode D that to be connected with by four models be 1N4007
1-D
4The bridge rectifier circuit of forming is connected with the filter capacitor C of one 470 μ F/25V at the output terminal of bridge rectifier circuit
1, at this filter capacitor C
1Positive pole one end and a model be that the input end of the three end integrated voltage stabilizer IC of LM317 is connected, be connected with the feedback resistance R of one 240 Ω between the output terminal of this three terminal regulator IC and the control end
1, also be connected with the filter capacitor C that a specification is 2.2 μ F/16V at the output terminal of three terminal regulator IC
2Control end at three terminal regulator IC is connected with eight grades of toggle switch K, filter capacitor C
1Negative pole one end be connected with 8 in parallel resistance R
2-R
9Its specification is respectively 62 Ω, 360 Ω, 910 Ω, 1.2K Ω, 1.8K Ω, 2.1K Ω, each resistance can be electrically connected with the control end of three terminal regulator IC separately in the adjustment by toggle switch K, thereby makes the output terminal of this direct supply can export the DC voltage of 1.5V, 3V, 4.5V, 6V, 7.5V, 9V, 10.5V, 12V respectively.Filter capacitor C
1Also with the specification capacitor C that is 0.01 μ F/63V
3Parallel connection, and with one by being used for the light emitting diode D that power supply shows
5Resistance R with a 10K Ω
10The series circuit that constitutes is in parallel.
Claims (2)
1, a kind of adjustable constant voltage dc source comprises a step-down transformer T, is connected the bridge rectifier circuit D on the transformer T secondary coil
1-D
4And the filter capacitor C that is connected the bridge rectifier circuit output terminal
1, this filter capacitor C
1An end also be connected with the input end of a three terminal regulator IC, between the output terminal of this three terminal regulator IC and control end, be connected with feedback resistance R
1, also be connected with another filter capacitor C at the output terminal of three terminal regulator IC
2, it is characterized in that: the control end at three terminal regulator IC is connected with one many grades toggle switch K, is being connected the filter capacitor C of bridge rectifier circuit output terminal
1In addition end be connected with a plurality of resistance R in parallel
2-R
9, each resistance can be electrically connected with the control end of three terminal regulator separately by many grades of toggle switch K.
2, according to the described direct supply of claim 1, it is characterized in that also being connected with a series circuit at the output terminal of bridge rectifier circuit, this circuit is by a light emitting diode D
5With a resistance R
10Form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92211311 CN2113513U (en) | 1992-02-28 | 1992-02-28 | Adjustable voltage-stabilizing dc power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92211311 CN2113513U (en) | 1992-02-28 | 1992-02-28 | Adjustable voltage-stabilizing dc power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2113513U true CN2113513U (en) | 1992-08-19 |
Family
ID=4956339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92211311 Granted CN2113513U (en) | 1992-02-28 | 1992-02-28 | Adjustable voltage-stabilizing dc power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2113513U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427685A (en) * | 2012-05-24 | 2013-12-04 | 鸿富锦精密工业(武汉)有限公司 | DC voltage generation circuit |
-
1992
- 1992-02-28 CN CN 92211311 patent/CN2113513U/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427685A (en) * | 2012-05-24 | 2013-12-04 | 鸿富锦精密工业(武汉)有限公司 | DC voltage generation circuit |
| US9071131B2 (en) | 2012-05-24 | 2015-06-30 | Hong Fu Jin Precision Industry (Wuhan) Co., Ltd. | Conversion system for multi direct current voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |