CN208506629U - A kind of power supply circuit based on far-end feedback - Google Patents
A kind of power supply circuit based on far-end feedback Download PDFInfo
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- CN208506629U CN208506629U CN201821337911.3U CN201821337911U CN208506629U CN 208506629 U CN208506629 U CN 208506629U CN 201821337911 U CN201821337911 U CN 201821337911U CN 208506629 U CN208506629 U CN 208506629U
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Abstract
The utility model discloses a kind of power supply circuits based on far-end feedback, including power output circuit, signal acquisition circuit and far-end feedback circuit；The power output circuit is connected to power supply and by cathode output end and cathode output end output power；The signal acquisition terminal of signal acquisition circuit and the cathode output end of power output circuit connect；Far-end feedback circuit includes the first operational amplifier, the non-inverting input terminal of first operational amplifier and the signal output end of signal acquisition circuit connect, the inverting input terminal of first operational amplifier is connected to an adjustable reference voltage, and the output end of the first operational amplifier and the negative input of power output circuit connect.By the way that far-end feedback circuit is arranged, far-end feedback circuit and power output circuit form close loop negative feedback and improve the electrical stability and Parameter adjustable of power output circuit to eliminate the pressure drop on supply path and loop path.The utility model is widely used in electronic circuit technology field.
Description
Technical field
The utility model relates to electronic circuit technology field, especially a kind of power supply circuit based on far-end feedback.
Background technique
In each field for needing to be applied to electronic circuit, power supply circuit be all it is essential, power supply circuit belongs to most
The normal work of one of basic module, other circuit modules in electronic circuit depends on the work of power supply circuit.Measurement plate
There is the circuit of measurement function to want to the electrical stability of power supply circuit and Parameter adjustable etc. for card, monitoring board and instrument etc.
It asks higher, mains ripple is generally required to be no more than 1mV, can be finely adjusted by stepping of 1mV.Existing power supply circuit is difficult to
It combines and meets high request of both electrical stability and Parameter adjustable.
Utility model content
The technical issues of in order to solve above-mentioned electrical stability and Parameter adjustable, the purpose of this utility model is to provide
A kind of power supply circuit based on far-end feedback.
Technical solution adopted in the utility model is:
A kind of power supply circuit based on far-end feedback, including power output circuit, signal acquisition circuit and far-end feedback electricity
Road；
The power output circuit includes electrode input end, negative input, cathode output end and cathode output end, described
The electrode input end and negative input of power output circuit are connected to power supply, and the power output circuit passes through cathode output end
With cathode output end output power；
The signal acquisition circuit includes signal acquisition terminal and signal output end, the signal acquisition of the signal acquisition circuit
End is connect with the cathode output end of power output circuit；
The far-end feedback circuit includes the first operational amplifier, the first low-pass filter circuit and the second low-pass filtering electricity
The non-inverting input terminal on road, first operational amplifier is exported by the signal of the first low-pass filter circuit and signal acquisition circuit
The inverting input terminal of end connection, first operational amplifier is connected to adjustable reference electricity by the second low-pass filter circuit
Pressure, the output end of first operational amplifier and the negative input of power output circuit connect.
Further, first capacitor is connected between the non-inverting input terminal and inverting input terminal of first operational amplifier
Device.
Further, the signal acquisition circuit is a resistance-capacitance circuit, and one end of the resistance-capacitance circuit is as signal acquisition
The signal acquisition terminal of circuit, signal output end of the other end of the resistance-capacitance circuit as signal acquisition circuit.
Further, first diode and the two or two are equipped between the negative input and power supply of the power output circuit
The cathode of pole pipe, the first diode is connect with positive pole, the first diode anode respectively with the second diode
Cathode connected with the negative input of power output circuit, second diode anode connect with power cathode.
Further, the power supply circuit further includes for adjustable reference voltage needed for providing the first operational amplifier
The output end of DAC module, the DAC module is connected by the inverting input terminal of the second low-pass filter circuit and the first operational amplifier
It connects.
Further, the power supply circuit further includes power amplification circuit, and the power amplification circuit includes the second operation
Amplifier, the non-inverting input terminal of the second operational amplifier and the cathode output end of power output circuit connect, and described second
The inverting input terminal of operational amplifier and the cathode output end of power output circuit connect, the reverse phase of the second operational amplifier
The connection of the cathode output end of input terminal and power output circuit.
Further, the second capacitor is connected between the non-inverting input terminal and inverting input terminal of the second operational amplifier
Device.
Further, connected between the cathode output end and negative input of the power output circuit by third capacitor
It connects.
The beneficial effects of the utility model are: setting far-end feedback circuit, far-end feedback circuit and power output circuit shape
At close loop negative feedback, to eliminate the pressure drop on supply path and loop path, the electrical stability of power output circuit is improved
With Parameter adjustable；The adjustable reference voltage that can be connected by adjusting far-end feedback circuit adjusts the output of power supply circuit
The Adjustment precision of voltage, power supply circuit output voltage is related with the Adjustment precision of adjustable reference voltage, comes when using 16 ADC
When providing reference voltage, the stepping of power supply circuit output voltage is up to 1mV.
Detailed description of the invention
Fig. 1 is power supply circuit construction block diagram of the utility model embodiment based on far-end feedback；
Fig. 2 is the circuit diagram of the utility model embodiment power output circuit and far-end feedback circuit；
Fig. 3 is the circuit diagram of the utility model embodiment signal acquisition circuit and power amplification circuit.
Specific embodiment
A kind of power supply circuit based on far-end feedback of the utility model, referring to Fig.1, including power output circuit, signal are adopted
Collector and far-end feedback circuit；
The power output circuit includes electrode input end, negative input, cathode output end and cathode output end, described
The electrode input end and negative input of power output circuit are connected to power supply, and the power output circuit passes through cathode output end
With cathode output end output power；
The signal acquisition circuit includes signal acquisition terminal and signal output end, the signal acquisition of the signal acquisition circuit
End is connect with the cathode output end of power output circuit；
The far-end feedback circuit includes the first operational amplifier, the first low-pass filter circuit and the second low-pass filtering electricity
The non-inverting input terminal on road, first operational amplifier is exported by the signal of the first low-pass filter circuit and signal acquisition circuit
The inverting input terminal of end connection, first operational amplifier is connected to adjustable reference electricity by the second low-pass filter circuit
Pressure, the output end of first operational amplifier and the negative input of power output circuit connect.
Referring to Fig. 2, the power amplifier U2 of model OPA569AIDWP can be used as power output circuit.Power fortune
The IN- and IN+ for putting U2 are respectively its inverting input terminal and non-inverting input terminal, using in the present invention when, IN- and IN+ points
Not Wei power output circuit negative input and electrode input end.The linearity of OPA569AIDWP is very high, itself can be real
Existing high-precision voltage output.In Fig. 2, confession can be eliminated using the far-end feedback circuit that the first operational amplifier U1 is constituted as core
Pressure drop on power path and loop path, therefore the voltage output precision of power amplifier U2 can be improved.
The principle of far-end feedback circuit is: the first operational amplifier U1 is received by the end PP0V5V_SINK_SRC_1A_SNS
The voltage signal that signal acquisition circuit samples carries out the inverting input terminal IN- that differential amplification is re-fed into power amplifier U2 later,
The closed loop circuit that far-end feedback circuit and power amplifier U2 are constituted is actually the in-phase amplification circuit that a gain amplifier is 1,
Therefore there is very high stability.
Negative pole end of the LOWSRENSE from distal end electricity consumption end, being combined into difference form with SNS signal can be to electricity consumption end
Voltage real-time sampling, and send the sampled signal into U1, the reverse side that U2 is sent into after finally being amplified by U1 constitutes negative-feedback.U2's
In-phase end connects DAC input, is arranged the voltage of U2 in-phase end using high-precision DAC, since U2 and U1 composition gain is 1 to follow
Circuit, so the output voltage of power supply circuit is the setting voltage of U2 in-phase end.
The output voltage for the closed loop circuit that far-end feedback circuit and power amplifier U2 are constituted, the i.e. voltage at the end BATT+ and the
The specific voltage value for the adjustable reference voltage that the inverting input terminal of one operational amplifier U1, that is, end LOWSENSE is connect is related.This
Reference voltage can be provided by high-precision DAC circuit, i.e. the end the LOWSENSE output end that is connected to DAC circuit, due to DAC electricity
The output voltage on road be high-precision it is adjustable, therefore voltage, that is, power supply circuit output voltage at the end BATT+ be also high-precision can
It adjusts, can achieve the adjustable stepping of 1mV using the output voltage of power supply circuit when 16 DAC circuit.
Be further used as preferred embodiment, the non-inverting input terminal and inverting input terminal of first operational amplifier it
Between be connected with first capacitor device.
Referring to Fig. 2, first capacitor device is connected between the non-inverting input terminal and inverting input terminal of the first operational amplifier U1
C81, the high frequency that first capacitor device C81 can be eliminated between the non-inverting input terminal and inverting input terminal of the first operational amplifier U1 are miscellaneous
Wave further increases the output accuracy of power supply circuit.
It is further used as preferred embodiment, the signal acquisition circuit is a resistance-capacitance circuit, the resistance-capacitance circuit
The other end of signal acquisition terminal of the one end as signal acquisition circuit, the resistance-capacitance circuit is defeated as the signal of signal acquisition circuit
Outlet.
Referring to Fig. 3, the signal acquisition circuit is the resistance-capacitance circuit composed in parallel by resistance R14 and capacitor C41.Make
Use resistance-capacitance circuit as signal acquisition circuit, it can be to avoid the surge voltage that power output circuit exports to far-end feedback circuit
It influences.
It is further used as preferred embodiment, the is equipped between the negative input and power supply of the power output circuit
One diode and the second diode, the cathode of the first diode are connect with positive pole, the anode of the first diode
It is connect respectively with the negative input of the cathode of the second diode and power output circuit, anode and the electricity of second diode
The connection of source cathode.
Referring to Fig. 2, the diode group D1 being made of first diode and the second Diode series be connected to the anode of power supply+
It is successively the cathode of first diode, the anode of first diode, second since positive pole between 5V and cathode (ground wire)
The cathode of diode, the anode of the second diode, ground wire, and power amplifier U2, that is, power output circuit negative input IN-
It is connected on the tie point of the anode of first diode and the cathode of the second diode.This connection structure makes power output electric
Voltage at the negative input IN- on road is maintained between 0V~5V, even if the voltage fluctuation of power supply, power output circuit
Negative input IN- at voltage will not be lower than the negative value of the forward voltage drop of first diode or the second diode, also
It is to say, when using diode that forward voltage drop is 0.7V as first diode or the second diode, power output circuit is born
Voltage at the input terminal IN- of pole just maintains the electricity that power amplifier U2 is got from power supply generally between -0.7V to 0V in this way
The stabilization of pressure further increases the stability of power amplifier U2 output voltage.
It is further used as preferred embodiment, the power supply circuit further includes power amplification circuit, the power amplification
Circuit includes second operational amplifier, and the non-inverting input terminal of the second operational amplifier and the anode of power output circuit export
End connection, the inverting input terminal of the second operational amplifier and the cathode output end of power output circuit connect, and described second
The inverting input terminal of operational amplifier and the cathode output end of power output circuit connect.
Referring to Fig. 3, second operational amplifier U3 is open loop connection status, the non-inverting input terminal of second operational amplifier U3 and
Reverse input end is connect with the cathode output end of power output circuit and cathode output end respectively.Second operational amplifier U3 can be with
Power output circuit, that is, power amplifier U2 output power is further amplified, to improve the load capacity of power supply circuit.
It is further used as preferred embodiment, referring to Fig. 3, the non-inverting input terminal of the second operational amplifier U3 and anti-
Pass through the second capacitor C16 connection between phase input terminal.Second capacitor C16 can eliminate the same phase of second operational amplifier U3
High frequency spurs between input terminal and inverting input terminal further increase the output accuracy of power supply circuit.
It is further used as preferred embodiment, between the cathode output end and negative input of the power output circuit
It is connected by third capacitor.
Referring to Fig. 2, pass through between power output circuit, that is, power amplifier U2 cathode output end VO and negative input IN-
The C3 connection of third capacitor, third capacitor C3 can also be considered as a part of far-end feedback circuit, by the way that third capacitor is arranged
Device C3 can provide alternating current path for far-end feedback circuit, to improve the negative feedback control effect of far-end feedback circuit, improve
The electrical stability and Parameter adjustable of power supply circuit.
In conclusion the utility model has the advantages that:
Far-end feedback circuit is set, and far-end feedback circuit and power output circuit form close loop negative feedback, to eliminate confession
Pressure drop on power path and loop path improves the electrical stability and Parameter adjustable of power output circuit；
The adjustable reference voltage that can be connected by adjusting far-end feedback circuit adjusts the output voltage of power supply circuit,
The Adjustment precision of power supply circuit output voltage is related with the Adjustment precision of adjustable reference voltage, provides when using 16 ADC
When reference voltage, the stepping of power supply circuit output voltage is up to 1mV；
The stability of power supply circuit is further increased provided with first capacitor, the second capacitor and third capacitor etc.；Circuit
Structure is simple, and cost of implementation is low.
It is to be illustrated to the preferable implementation of the utility model, but be not limited to the utility model creation above
The embodiment, those skilled in the art can also make various without departing from the spirit of the present invention
Equivalent deformation or replacement, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (8)
1. a kind of power supply circuit based on far-end feedback, which is characterized in that including power output circuit, signal acquisition circuit and remote
Hold feed circuit；
The power output circuit includes electrode input end, negative input, cathode output end and cathode output end, the power
The electrode input end and negative input of output circuit are connected to power supply, and the power output circuit is by cathode output end and bears
Pole output end output power；
The signal acquisition circuit includes signal acquisition terminal and signal output end, the signal acquisition terminal of the signal acquisition circuit with
The cathode output end of power output circuit connects；
The far-end feedback circuit includes the first operational amplifier, the first low-pass filter circuit and the second low-pass filter circuit, institute
The non-inverting input terminal for stating the first operational amplifier is connected by the signal output end of the first low-pass filter circuit and signal acquisition circuit
It connects, the inverting input terminal of first operational amplifier is connected to an adjustable reference voltage, institute by the second low-pass filter circuit
The negative input of the output end and power output circuit of stating the first operational amplifier connects.
2. a kind of power supply circuit based on far-end feedback according to claim 1, which is characterized in that first operation is put
First capacitor device is connected between the non-inverting input terminal and inverting input terminal of big device.
3. a kind of power supply circuit based on far-end feedback according to claim 1, which is characterized in that the signal acquisition electricity
Lu Weiyi resistance-capacitance circuit, signal acquisition terminal of the one end of the resistance-capacitance circuit as signal acquisition circuit, the resistance-capacitance circuit
Signal output end of the other end as signal acquisition circuit.
4. a kind of power supply circuit based on far-end feedback according to claim 1, which is characterized in that the power output electricity
First diode and the second diode, the cathode and power supply of the first diode are equipped between the negative input and power supply on road
Anode connection, the positive negative input with the cathode of the second diode and power output circuit respectively of the first diode
The anode of connection, second diode is connect with power cathode.
5. a kind of power supply circuit based on far-end feedback according to claim 1, which is characterized in that the power supply circuit is also
Including the DAC module for adjustable reference voltage needed for providing the first operational amplifier, the output end of the DAC module passes through
Second low-pass filter circuit is connect with the inverting input terminal of the first operational amplifier.
6. a kind of power supply circuit based on far-end feedback according to claim 1, which is characterized in that the power supply circuit is also
Including power amplification circuit, the power amplification circuit includes second operational amplifier, the same phase of the second operational amplifier
The connection of the cathode output end of input terminal and power output circuit, the inverting input terminal and power output of the second operational amplifier
The cathode output end of circuit connects, and the output end of the second operational amplifier is connected to load.
7. a kind of power supply circuit based on far-end feedback according to claim 6, which is characterized in that second operation is put
The second capacitor is connected between the non-inverting input terminal and inverting input terminal of big device.
8. a kind of power supply circuit based on far-end feedback according to claim 1, which is characterized in that the power output electricity
It is connected between the cathode output end and negative input on road by third capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821337911.3U CN208506629U (en) | 2018-08-20 | 2018-08-20 | A kind of power supply circuit based on far-end feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821337911.3U CN208506629U (en) | 2018-08-20 | 2018-08-20 | A kind of power supply circuit based on far-end feedback |
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| Publication Number | Publication Date |
|---|---|
| CN208506629U true CN208506629U (en) | 2019-02-15 |
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ID=65300694
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821337911.3U Active CN208506629U (en) | 2018-08-20 | 2018-08-20 | A kind of power supply circuit based on far-end feedback |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505357A (en) * | 2020-04-02 | 2020-08-07 | 江苏省送变电有限公司 | Power supply for testing electrical characteristic parameters of large-section conductor |
| CN112416040A (en) * | 2019-08-21 | 2021-02-26 | 北京比特大陆科技有限公司 | Parallel power supply voltage adjusting method, device, equipment, system and storage medium |
| CN113687681A (en) * | 2021-08-20 | 2021-11-23 | 京东方科技集团股份有限公司 | Power module, operational amplifier driving and dimming glass |
| CN115963912A (en) * | 2023-03-10 | 2023-04-14 | 苏州浪潮智能科技有限公司 | Server power supply device assembly power supply control method, system, equipment and medium |
-
2018
- 2018-08-20 CN CN201821337911.3U patent/CN208506629U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112416040A (en) * | 2019-08-21 | 2021-02-26 | 北京比特大陆科技有限公司 | Parallel power supply voltage adjusting method, device, equipment, system and storage medium |
| CN111505357A (en) * | 2020-04-02 | 2020-08-07 | 江苏省送变电有限公司 | Power supply for testing electrical characteristic parameters of large-section conductor |
| CN111505357B (en) * | 2020-04-02 | 2022-06-14 | 江苏省送变电有限公司 | Power supply for testing electrical characteristic parameters of large-section conductor |
| CN113687681A (en) * | 2021-08-20 | 2021-11-23 | 京东方科技集团股份有限公司 | Power module, operational amplifier driving and dimming glass |
| CN115963912A (en) * | 2023-03-10 | 2023-04-14 | 苏州浪潮智能科技有限公司 | Server power supply device assembly power supply control method, system, equipment and medium |
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Address after: 511450 Room 101, 201, 301, 401, 501, building 2, 1003 Asian Games Avenue, Shiqi Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: Guangzhou silinger Technology Co.,Ltd. Address before: 511450 floor 1-3, building B, No.1, Zhongjiazhuang North Road, Shigang East Village, Dalong street, Panyu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU SMARTGIANT NETWORK TECHNOLOGY Co.,Ltd. |
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