CN201674396U - Switching power output device - Google Patents
Switching power output device Download PDFInfo
- Publication number
- CN201674396U CN201674396U CN2010201845233U CN201020184523U CN201674396U CN 201674396 U CN201674396 U CN 201674396U CN 2010201845233 U CN2010201845233 U CN 2010201845233U CN 201020184523 U CN201020184523 U CN 201020184523U CN 201674396 U CN201674396 U CN 201674396U
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- Prior art keywords
- resistance
- power supply
- output
- switching power
- utility
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- Expired - Lifetime
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- Control Of Voltage And Current In General (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model is applicable to the power field, and provides a switching power output device, which can change the output voltage through changing different reference voltages instead of realizing different output voltages through changing feedback systems based on the changes in different resistances. The utility model has the advantages that: a) the accuracy of the output voltage can be easily controlled within the standard range; b) the PLUG head changes the output voltage through changing different reference voltages instead of being connected into the feedback system in the power supply, thereby preventing the feedback system in the power supply from being affected by the external interference; and c) the circuit of the PLUG head is arranged on a separate PCB in the structure, thereby facilitating the operation and production.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to a kind of Switching Power Supply output device.
Background technology
In general Switching Power Supply, when needing to export different voltage, must change internal transformer and just can finish with relevant electronic component.At present, prior art provides a solution, promptly finishes different voltages outputs by the resistance that changes the inner sample resistance of power supply.But, the mode of the resistance by changing the inner sample resistance of power supply, have following defective: the output wire rod has certain length, there is pressure drop, to the difficult control of the accuracy of output voltage, the resistance of resistance in the PLUG head and power supply inside will be connected by output line, and Wai Jie interference is very big to the influence of power supply reponse system like this.And, in the PLUG head, imbed a plug-in unit resistance aborning with the welding in bad operation, it is consuming time to take a lot of work.
The utility model content
The purpose of the utility model embodiment is to provide a kind of Switching Power Supply output device, when being intended to solve the mode of the resistance by changing the inner sample resistance of power supply, and existing problem.
The utility model embodiment is achieved in that a kind of Switching Power Supply output device, and described device comprises the Switching Power Supply internal circuit and the PLUG circuit of the different output voltages of generation that connect with described Switching Power Supply internal circuit,
Described PLUG circuit comprises current-limiting resistance R1, the resistance R 2 of adjustable resistance, and the R3 series connection in described resistance R 2, is provided with the U1 of the voltage stabilizing IC that produces reference voltage between the R3, and the output of described U1 links to each other with the Switching Power Supply internal circuit.
Further, described Switching Power Supply internal circuit comprises the U2 of the voltage stabilizing IC that produces reference voltage, described U2 links to each other with the positive input of comparator IC1B by paster Schottky diode D1, the positive input terminal of comparator IC1B links to each other with the output of described U1, the reverse input end of described comparator IC1B is connected in resistance R 5, between the R7, the other end of resistance R 7 is connected in the input of U2, the output of described comparator IC1B is connected between diode D2 and the resistance R 4, described resistance R 4 links to each other with resistance R 5 by capacitor C 1, output at U2 also is connected with resistance R 6, and the other end of described resistance R 6 and resistance R 5 are connected in output voltage V o.
In the utility model, change output voltage by changing different reference voltages, not to change reponse system and realize different output voltages by changing different resistances.Thereby possess following beneficial effect: a) precision of output voltage controls in the critical field easily.B) the PLUG head is to change output voltage by changing different reference voltages, is not the reponse system that inserts power supply inside, and the reponse system of internal electric source can not received the influence of external disturbance like this.C) circuit of PLUG head is to be designed on the independent PCB, is convenient to operation and production like this.
Description of drawings
Fig. 1 is the structural representation of the Switching Power Supply internal wiring that provides of the utility model embodiment;
Fig. 2 is the structural representation of the PLUG circuit of the different output voltages that provide of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Consult Fig. 1,2, Fig. 1 shows the structure of the Switching Power Supply internal circuit that the utility model embodiment provides, and Fig. 2 shows the structure of the PLUG circuit of the different output voltages that the utility model embodiment provides, and this PLUG circuit produces different reference voltages.The utility model is to change different output voltages by changing different reference voltage values.
The utility model specifically comprises Switching Power Supply internal circuit (Fig. 1) and the PLUG circuit (Fig. 2) of the different output voltages of generation that connect with described switching power circuit.Can couple together by the CONTROL end of DC line two figure.
This PLUG circuit comprises current-limiting resistance R1, the resistance R 2 of replaceable different resistances, the R3 series connection is in described resistance R 2, be provided with the U1 of the voltage stabilizing IC that produces reference voltage between the R3, the output of described U1 links to each other with the inverting input of the comparator IC1B of Switching Power Supply internal circuit.
This Switching Power Supply internal circuit comprises the U2 (voltage stabilizing IC) that produces reference voltage, described U2 links to each other with the positive input of comparator IC1B by paster Schottky diode D1, and the positive input terminal of comparator IC1B is connected with CONTROL in (Fig. 2) and holds and be connected with CONTROL in (Fig. 1).The reverse input end of described comparator IC1B is connected between resistance R 5, the R7.The other end of resistance R 7 is connected in the input of U2.The output of described comparator IC1B is connected between diode D2 and the resistance R 4.Described resistance R 4 links to each other with resistance R 5 by capacitor C 1.Output at U2 also is connected with resistance R 6.The other end of resistance R 6 and resistance R 5 are connected in output voltage V o.
When the DC line does not connect the PLUG circuit, after the Switching Power Supply operate as normal, output voltage V o controls by U2, R5, R6, IC1, operation principle is: by the R6 current limliting, U2 produces the benchmark of a 2.5V, 5 pin (being positive input) by D1 input IC1, as reference voltage, by R5, R6 carries out dividing potential drop output voltage V o is detected, and the benchmark with 5 pin compares then, the error that produces is amplified by IC1, feed back to elementaryly then by optocoupler, change the duty ratio of PWM, the output of stablizing Vo.
When the CONTROL among Fig. 1 end with after the CONTROL end of Fig. 2 links to each other by the DC line, Vo voltage is by the R1 current limliting, then by changing R2, the different resistances of R3, U1 produces (greater than 2.5V) different CONTROL voltage then, the benchmark 2.5V that U2 produces is less than CONTROL voltage, D1 is ended, reference voltage improves, output voltage has also and then improved then, like this, and just can (different PLUG inside be by changing R2 by connecting different PLUG, the tissue of R3 produces different benchmark), obtain different voltage output.Owing to be to change different reference voltages, not to change resistance, the precision of output voltage is easy to and can be controlled in the critical field.It is not to be connected on the reponse system of power supply inside that the PLUG head feeds back to power supply inside, but receives on the reference voltage, so extraneous interference can not have influence on the reponse system of internal electric source.Owing to fixedly PLUG head of independent pcb board is arranged, is convenient to welding and operation.
In sum, in the utility model, changing output voltage by changing different reference voltages, is not to change reponse system and realize different output voltages by changing different resistances.Thereby possess following beneficial effect: a) precision of output voltage controls in the critical field easily.B) the PLUG head is to change output voltage by changing different reference voltages, is not the reponse system that inserts power supply inside, and the reponse system of internal electric source can not received the influence of external disturbance like this.C) circuit of PLUG head is to be designed on the independent PCB, is convenient to operation and production like this.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (2)
1. a Switching Power Supply output device is characterized in that, described device comprises the Switching Power Supply internal circuit and the PLUG circuit of the different output voltages of generation that connect with described Switching Power Supply internal circuit,
Described PLUG circuit comprises current-limiting resistance R1, the resistance R 2 of adjustable resistance, and the R3 series connection in described resistance R 2, is provided with the U1 of the voltage stabilizing IC that produces reference voltage between the R3, and the output of described U1 links to each other with the Switching Power Supply internal circuit.
2. Switching Power Supply output device according to claim 1, it is characterized in that, described Switching Power Supply internal circuit comprises the U2 of the voltage stabilizing IC that produces reference voltage, described U2 links to each other with the positive input of comparator IC1B by paster Schottky diode D1, the positive input terminal of comparator IC1B links to each other with the output of described U1, the reverse input end of described comparator IC1B is connected in resistance R 5, between the R7, the other end of resistance R 7 is connected in the input of U2, the output of described comparator IC1B is connected between diode D2 and the resistance R 4, described resistance R 4 links to each other with resistance R 5 by capacitor C 1, output at U2 also is connected with resistance R 6, and the other end of described resistance R 6 and resistance R 5 are connected in output voltage V o.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201845233U CN201674396U (en) | 2010-04-30 | 2010-04-30 | Switching power output device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201845233U CN201674396U (en) | 2010-04-30 | 2010-04-30 | Switching power output device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674396U true CN201674396U (en) | 2010-12-15 |
Family
ID=43331803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201845233U Expired - Lifetime CN201674396U (en) | 2010-04-30 | 2010-04-30 | Switching power output device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201674396U (en) |
-
2010
- 2010-04-30 CN CN2010201845233U patent/CN201674396U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101215 |