CN201256357Y - Compensation device for output voltage - Google Patents
Compensation device for output voltage Download PDFInfo
- Publication number
- CN201256357Y CN201256357Y CNU200820127303XU CN200820127303U CN201256357Y CN 201256357 Y CN201256357 Y CN 201256357Y CN U200820127303X U CNU200820127303X U CN U200820127303XU CN 200820127303 U CN200820127303 U CN 200820127303U CN 201256357 Y CN201256357 Y CN 201256357Y
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- voltage
- output
- output voltage
- compensating device
- pwm controller
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Abstract
The utility model provides an output voltage compensation device, which comprises a voltage-reduced conversion circuit (BuckConverter), a current detecting resistance, a voltage feedback loop and a pulse-width modulation controller (Pulse WidthModulation Controller), wherein an output end in the voltage-reduced conversion circuit is connected with the current detecting resistance in series, front end voltage of the current detecting resistance and practical output voltage are obtained and compared, and the working period of a voltage-reduced conversion circuit system is adjusted through the pulse-width modulation controller, thereby achieving the purpose of voltage compensation.
Description
Technical field
The utility model relates to a kind of output voltage compensating device, relate in particular to and a kind ofly can carry out the voltage compensation action for the voltage loss that is caused because of wire rod impedance and connector contact impedance, so that the realistic designing requirement of output voltage regulation, and so as to the output voltage compensating device of more stable output voltage is provided.
Background technology
Portable electronic product development in recent years rapidly, and car fills product for cooperating the use of each electronic product, its output current specification also has increasing trend, thereby causes line drop to increase relatively, causes voltage regulation to exceed the receptible scope of each electronic product easily.Traditional settling mode adds a V sense line at the wire rod of output, with the go forward side by side compensation of line output voltage of the terminal actual output voltage of detecting wire rod, but the voltage compensation effect of this practice is limited, the processing procedure of output wire rod also can more capable complexity and cost improve relatively.
Summary of the invention
The purpose of this utility model is promptly providing a kind of output voltage compensating device, and this output voltage compensating device can be done line drop effective compensation, and stable voltage output is provided, and so as to simplifying processing procedure and reducing cost.
For reaching above-mentioned purpose, the utility model output voltage compensating device comprises: decompression converting circuit (BuckConverter), current sense resistor, voltage feedback circuit and PWM controller structures such as (PWM Controller), it is characterized in that: be connected in series a current sense resistor via output in decompression converting circuit, the two compares via OP AMP terminal voltage with actual output voltage before getting its current sense resistor, and its result delivered to PWM controller, make its work period of adjusting the decompression converting circuit system, and then reach the purpose of voltage compensation.
The beneficial effects of the utility model: line drop can be done effective compensation, stable voltage output is provided, and so as to simplifying processing procedure and reducing cost.
For further setting forth the utility model is technological means and the effect that the predetermined purpose of realization is taked, see also following about detailed description of the present utility model and accompanying drawing, believe the purpose of this utility model, feature and characteristics, should obtain thus going deep into and concrete understanding, yet accompanying drawing only provides reference and explanation usefulness, is not to be used for the utility model is limited.
Description of drawings
Below in conjunction with accompanying drawing, by embodiment of the present utility model is described in detail, technical scheme and other beneficial effects of utility model are apparent with making.
In the accompanying drawing,
The circuit diagram of Fig. 1 the utility model output voltage compensating device first embodiment.
The circuit diagram of Fig. 2 the utility model output voltage compensating device second embodiment.
The inside calcspar of PWM controller among Fig. 3 Fig. 2.
Embodiment
For explanation technological means, architectural feature and purpose of being reached and effect that the utility model adopted, be described in detail as follows with preferred embodiment of the present utility model and conjunction with figs..
As shown in Figure 1, be first embodiment of the utility model output voltage compensating device, form by decompression converting circuit (Buck Converter) 2, current sense resistor 20, sensing resistor 21, divider resistance 24, voltage set point 22, voltage back coupling point 23 and 3 of PWM controller (PWM Controller).This PWM controller 3 can adopt commercially available similar product, the front end of the current sense resistor 20 of output in this decompression converting circuit 2 wherein, connect sensing resistor 21 with circuit, this sensing resistor 21 can detect because of output current increase the sensing resistor that causes 20 both end voltage the variation of increase is fallen, the voltage drop signal of this increase is via after sensing resistor 21 and divider resistance 24 dividing potential drops, the setting voltage of the voltage set point 22 of PWM controller 3 is up promoted, the voltage of voltage back coupling this moment point 23 is lower than the voltage that voltage is set end 22, via the OP AMP in the PWM controller 3 relatively after, its result is delivered to PWM controller, make its work period of adjusting decompression converting circuit 2, thereby reach the purpose of voltage compensation.What deserves to be explained is that the big I of this sensing resistor 21 cooperates the voltage drop signal that detects to adjust, satisfying the size of different product specification output current, and then can do effective voltage compensation.
As shown in Figure 2, second embodiment for the utility model output voltage compensating device, Fig. 3 is the inside calcspar of PWM controller 3 ' among Fig. 2, as shown in Figure 2, the output voltage compensating device of present embodiment is made up of current sense resistor 20 ', sensing resistor 21 ', divider resistance 24 ', voltage set point 22 ', voltage back coupling point 23 ' and PWM controller (PWM Controller) 3 ' institute equally.The main difference of itself and first embodiment, consult Fig. 3, be to be provided with in this PWM controller 3 ' operational amplifier 4 ' and buffer amplifier 5 ', two inputs of this operational amplifier 4 ' are in parallel with the current sense resistor 20 ' of decompression converting circuit 2 ' output, the output of operational amplifier 4 ' then with circuit via sensing resistor 21 ', after this PWM controller 3 ' adds divider resistance 24 ' dividing potential drop, be connected in the input of buffer amplifier 5 ' more again.
When output current increases, the voltage drop signal at current sense resistor 20 ' two ends also can increase, the voltage drop signal of this increase is via the ISP pin 31 ' and ISN pin 32 ' of this PWM controller 3 ', promote the output voltage of operational amplifier 4 ', the output voltage of this lifting up promotes via after sensing resistor 21 ' and the divider resistance 24 ' dividing potential drop this dividing potential drop signal being seen through the voltage set point 22 ' of buffer amplifier 5 ' with this operational amplifier 4 ', to adjust the work period of PWM controller 3 ', make the voltage of its booster tension back coupling point 23 ', and then regulated output voltage is to reach the purpose of voltage compensation.And the size of this divider resistance 24 ' can cooperate the voltage drop signal that detects to adjust equally, satisfying the size of different product specification output current, and then can effectively make voltage compensation.
In sum, the utility model output voltage compensating device has really met the important document of novel patent, proposes patent application in accordance with the law.The above only is preferred embodiment of the present utility model, every various modifications of doing according to the utility model with change the protection range that all should belong to claim of the present utility model.
Claims (4)
1, a kind of output voltage compensating device can be done the outlet line pressure drop effective compensation, and stable output voltage is provided, and it is characterized in that:
The front end of the current sense resistor of output is serially connected with sensing resistor in this decompression converting circuit, detect the voltage drop signal and so as to the voltage of the voltage set point that promotes this PWM controller, adjusting the work period of decompression converting circuit system, and reach the purpose of voltage compensation.
2, output voltage compensating device as claimed in claim 1 is characterized in that, the size of described sensing resistor cooperates the voltage drop signal that detects to adjust, to satisfy the size of different product specification output current.
3, output voltage compensating device as claimed in claim 2, it is characterized in that, in this PWM controller, be provided with operational amplifier and buffer amplifier, this operational amplifier is serially connected with the front end of the current sense resistor of output in this decompression converting circuit, and after the sensing resistor and divider resistance dividing potential drop via this PWM controller, be connected in this buffer amplifier input.
4, output voltage compensating device as claimed in claim 3 is characterized in that, establishes a reference voltage in this buffer amplifier output and sets as the output voltage of this decompression converting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820127303XU CN201256357Y (en) | 2008-07-24 | 2008-07-24 | Compensation device for output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820127303XU CN201256357Y (en) | 2008-07-24 | 2008-07-24 | Compensation device for output voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201256357Y true CN201256357Y (en) | 2009-06-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820127303XU Expired - Fee Related CN201256357Y (en) | 2008-07-24 | 2008-07-24 | Compensation device for output voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201256357Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101844725A (en) * | 2010-05-25 | 2010-09-29 | 许伟新 | Line voltage drop automatic detection control method for hoisting machinery |
| CN101714817B (en) * | 2009-12-09 | 2012-12-12 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
-
2008
- 2008-07-24 CN CNU200820127303XU patent/CN201256357Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714817B (en) * | 2009-12-09 | 2012-12-12 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN101844725A (en) * | 2010-05-25 | 2010-09-29 | 许伟新 | Line voltage drop automatic detection control method for hoisting machinery |
| CN101844725B (en) * | 2010-05-25 | 2012-07-25 | 上海明东集装箱码头有限公司 | Line voltage drop automatic detection control method for hoisting machinery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090610 Termination date: 20110724 |