CN204882689U - Switching power supply output voltage sampling circuit - Google Patents
Switching power supply output voltage sampling circuit Download PDFInfo
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- CN204882689U CN204882689U CN201520595167.7U CN201520595167U CN204882689U CN 204882689 U CN204882689 U CN 204882689U CN 201520595167 U CN201520595167 U CN 201520595167U CN 204882689 U CN204882689 U CN 204882689U
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- operational amplifier
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Abstract
The utility model relates to a switching power supply output voltage sampling circuit belongs to signal acquisition circuit technical field. Because the utility model discloses a ripple voltage sampling technique, in the reliable and stable advantage of hold switch adapter output voltage average value sampling circuit, the output voltage ripple weight that has superposeed on sampled signal, therefore the sampled signal who finally obtains can reflect switch adapter output voltage really, the sampling technique 1 loop that offers switching power supply suppresses the output ripple voltage of power effectively, it is few to have components and parts of use, the circuit is simple, the accurate effect of sampling technique 3.
Description
Technical field
The utility model relates to signal acquisition circuit technical field, is specifically related to a kind of switch power source output voltage sample circuit.
Background technology
The voltage regulation loop of Switching Power Supply needs sampling switch electric power output voltage accurately, exports with the voltage stabilizing realizing power supply self.Conventional switch power source output voltage sample circuit, in order to suppress the interference of due to voltage spikes, sample circuit carries out capacitance-resistance filter, the mean value obtaining output voltage after filtering is sampled, use the signal that this sample mode obtains, lost the AC ripple component that electric power output voltage superposes, can not reflect the actual value of output voltage strictly according to the facts, voltage regulation loop also just loses the rejection ability to ripple voltage.
Publication number is that CN104485816A Chinese patent literature discloses a kind of staggered-parallel-type Switching Power Supply and control method thereof, propose and generate AC ripple signal according to the switch controlling signal of multichannel power stage circuit, then AC ripple signal is superposed the method carrying out controlling with output voltage feedback signal, but its AC ripple signal is not the ripple voltage signal on real output voltage, be difficult to control accurately output voltage.
Utility model content
(1) technical matters that will solve
The technical problems to be solved in the utility model is: with ripple voltage sampling and the switch power source output voltage sample circuit of average voltage sampling functions while of how designing a kind of.
(2) technical scheme
In order to solve the problems of the technologies described above, the utility model provides a kind of switch power source output voltage sample circuit, comprise: dual operational amplifier N1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, one end of resistance R1 be sampled voltage VIN and be connected, the other end of resistance R1 connects the INA+ of input pin in the same way of the first operational amplifier in dual operational amplifier N1, one end of the other end of resistance R1 contact resistance R2 simultaneously, the other end ground connection of resistance R2, electric capacity C1 and resistance R1 is connected in parallel;
One end of resistance R3 be sampled voltage VIN and be connected, the other end of resistance R3 connects the INB+ of input pin in the same way of the second operational amplifier in dual operational amplifier N1, one end of the other end of resistance R3 contact resistance R4 simultaneously, the other end ground connection of resistance R4, electric capacity C2 and resistance R4 is connected in parallel;
The reverse input pin INA-of the first operational amplifier in dual operational amplifier N1 is connected with the output pin OUTA of the first operational amplifier in dual operational amplifier N1, one end of contact resistance R5 while of pin INA-, the other end of resistance R5 is connected with resistance R6, and the other end of resistance R6 is connected with the reverse input pin INB-of the second operational amplifier in dual operational amplifier N1, the output pin OUTB of the second operational amplifier simultaneously; The power pins of dual operational amplifier N1 connects power supply VCC, grounding pin ground connection.
(3) beneficial effect
Because the utility model have employed ripple voltage Sampling techniques, while the advantage that maintained switch electric power output voltage mean value sample circuit is reliable and stable, sampled signal has superposed output voltage ripple component, thus the sampled signal finally obtained can reflect switch power source output voltage truly, the output ripple voltage of voltage regulation loop to power supply being supplied to Switching Power Supply suppresses effectively, have and use components and parts few, circuit is simple, the accurate effect of voltage sample.
Accompanying drawing explanation
Fig. 1 is the switch power source output voltage sample circuit figure of the utility model embodiment.
Embodiment
For making the purpose of this utility model, content and advantage clearly, below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.
As shown in Figure 1, the utility model provides a kind of switch power source output voltage sample circuit, comprise: dual operational amplifier N1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2 is totally one dual operational amplifier, two electric capacity, six resistance, one end of resistance R1 be sampled voltage VIN and be connected, the other end of resistance R1 connects the INA+ of input pin in the same way of the first operational amplifier in dual operational amplifier N1, one end of the other end of resistance R1 contact resistance R2 simultaneously, the other end ground connection of resistance R2, electric capacity C1 and resistance R1 is connected in parallel, resistance R1, R2, electric capacity C1 and the first operational amplifier form described ripple voltage sample circuit, resistance R5, R6 form described supercircuit,
One end of resistance R3 be sampled voltage VIN and be connected, the other end of resistance R3 connects the INB+ of input pin in the same way of the second operational amplifier in dual operational amplifier N1, one end of the other end of resistance R3 contact resistance R4 simultaneously, the other end ground connection of resistance R4, electric capacity C2 and resistance R4 is connected in parallel; Resistance R3, R4, electric capacity C2 and the second operational amplifier form described average voltage sample circuit;
The reverse input pin INA-of the first operational amplifier in dual operational amplifier N1 is connected with the output pin OUTA of the first operational amplifier in dual operational amplifier N1, one end of contact resistance R5 while of pin INA-, the other end of resistance R5 is connected with resistance R6, and the other end of resistance R6 is connected with the reverse input pin INB-of the second operational amplifier in dual operational amplifier N1, the output pin OUTB of the second operational amplifier simultaneously; The power pins of dual operational amplifier N1 connects power supply VCC, grounding pin ground connection.
Having the switch power source output voltage sample circuit with ripple sampling functions of said structure, is that the tie point of resistance R5 and resistance R6 is as output terminal using the tie point of resistance R1 and electric capacity C1 as input end.
During circuit working, in resistance R1, resistance R2, electric capacity C1 and dual operational amplifier, the first operational amplifier N1A of N1 constitutes ripple voltage sample circuit; The second operational amplifier N1B in resistance R3, resistance R4, electric capacity C2 and dual operational amplifier N1 constitutes average voltage sample circuit, and resistance R5 and R6 constitutes supercircuit.After being sampled voltage VIN input, resistance R1 and resistance R2 carries out dividing potential drop to being sampled voltage VIN, due to electric capacity C1 simultaneously in parallel on resistance R1, it is then low impedance path that electric capacity C1 presents high impedance status for AC signal to direct current signal, so sampled voltage is preserved by ripple voltage component after electric capacity C1, the voltage follower circuit that the first operational amplifier N1A again in dual operational amplifier N1 is formed, obtains ripple voltage sampled value; And resistance R3 and resistance R4 carries out dividing potential drop to being sampled voltage VIN, simultaneously resistance R3 and electric capacity C2 constitutes first-order low-pass wave circuit and carries out filtering to sampled voltage, sampled voltage is by dividing potential drop and after filtering, become the average voltage proportional with switch power source output voltage, the voltage follower circuit that the second operational amplifier N1B again in dual operational amplifier N1 is formed, obtains average voltage sampled value.Ripple voltage and average voltage sampled value are undertaken superposing the feedback signal of rear output as switch power source output voltage by resistance R5 and R6, achieve the accurate sampling of switch power source output voltage.
As can be seen from the above embodiments, because the utility model have employed ripple voltage Sampling techniques, while the advantage that maintained switch electric power output voltage mean value sample circuit is reliable and stable, sampled signal has superposed output voltage ripple component, thus the sampled signal finally obtained can reflect switch power source output voltage truly, the output ripple voltage of voltage regulation loop to power supply being supplied to Switching Power Supply as feedback signal suppresses effectively, by the resistance to each resistance, the selection of the capacitance of electric capacity can also realize output ripple voltage and export average voltage oversampling ratio adjustable, have and use components and parts few, circuit is simple, the accurate effect of voltage sample.The utility model can be used for replacing existing switch power source output voltage sample circuit, and the output voltage for Switching Power Supply is sampled.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and distortion, these improve and distortion also should be considered as protection domain of the present utility model.
Claims (1)
1. a switch power source output voltage sample circuit, it is characterized in that, comprise: dual operational amplifier N1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, one end of resistance R1 be sampled voltage VIN and be connected, the other end of resistance R1 connects the INA+ of input pin in the same way of the first operational amplifier in dual operational amplifier N1, one end of the other end of resistance R1 contact resistance R2 simultaneously, the other end ground connection of resistance R2, electric capacity C1 and resistance R1 is connected in parallel;
One end of resistance R3 be sampled voltage VIN and be connected, the other end of resistance R3 connects the INB+ of input pin in the same way of the second operational amplifier in dual operational amplifier N1, one end of the other end of resistance R3 contact resistance R4 simultaneously, the other end ground connection of resistance R4, electric capacity C2 and resistance R4 is connected in parallel;
The reverse input pin INA-of the first operational amplifier in dual operational amplifier N1 is connected with the output pin OUTA of the first operational amplifier in dual operational amplifier N1, one end of contact resistance R5 while of pin INA-, the other end of resistance R5 is connected with resistance R6, and the other end of resistance R6 is connected with the reverse input pin INB-of the second operational amplifier in dual operational amplifier N1, the output pin OUTB of the second operational amplifier simultaneously; The power pins of dual operational amplifier N1 connects power supply VCC, grounding pin ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520595167.7U CN204882689U (en) | 2015-08-07 | 2015-08-07 | Switching power supply output voltage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520595167.7U CN204882689U (en) | 2015-08-07 | 2015-08-07 | Switching power supply output voltage sampling circuit |
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| Publication Number | Publication Date |
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| CN204882689U true CN204882689U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520595167.7U Expired - Fee Related CN204882689U (en) | 2015-08-07 | 2015-08-07 | Switching power supply output voltage sampling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991108A (en) * | 2015-08-07 | 2015-10-21 | 中国航天科工集团第三研究院第八三五七研究所 | Switch power supply output voltage sampling circuit |
-
2015
- 2015-08-07 CN CN201520595167.7U patent/CN204882689U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991108A (en) * | 2015-08-07 | 2015-10-21 | 中国航天科工集团第三研究院第八三五七研究所 | Switch power supply output voltage sampling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20200807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |