CN109445502A - A kind of high-precision feed circuit - Google Patents
A kind of high-precision feed circuit Download PDFInfo
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- CN109445502A CN109445502A CN201811578757.3A CN201811578757A CN109445502A CN 109445502 A CN109445502 A CN 109445502A CN 201811578757 A CN201811578757 A CN 201811578757A CN 109445502 A CN109445502 A CN 109445502A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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Abstract
The present invention relates to electronic circuit design field more particularly to a kind of high-precision feed circuits.The output voltage of voltage output end is determined by the 9th resistance, the tenth resistance and feedback compensation circuit, wherein when normal output voltage, the 3rd resistor and second resistance that appropriate adjustment is electrically connected with triode allow triode operation in linear zone.When the circuit is operating, 4th resistance and the 5th resistance provide steady state operating current for the working condition of three end adjustable shunt reference sources, the 4th resistance provides operating current to the voltage-reference of three end adjustable shunt reference sources simultaneously, when normal work, electric current is punctured by three end adjustable shunt reference sources, three end adjustable shunt reference sources provide the reference voltage of a 2.5V, then carry out ratio enlargement by the 6th resistance and the 7th resistance for output voltage.This high-precision feed circuit loop stability, having to output voltage precision, load regulation and the Serial regulation of product significantly improves.
Description
Technical field
The present invention relates to electronic circuit design field more particularly to a kind of high-precision feed circuits.
Background technique
In current Switching Power Supply product, small size has become the integrated higher and higher of development trend and chip.
Had at present more and more power supply chip producers by voltage-reference with control integrated chip to together, such as the INNO of PI
Family chip, as shown in Figure 1, this column chip is in application, be in reference voltage foot FB plus the lower inclined resistance (R1 in as Fig. 1
And R2), realize output voltage feedback, but since the voltage accuracy of reference voltage foot FB is not high, generally 3% or so, in addition
The precision of the upper lower inclined resistance of reference voltage foot FB foot, so that the output voltage precision of entire product is close to 5%.This is for existing
Product requirement output voltage precision be it is far from being enough, wherein existing product require output voltage precision controlling within 1%.
Therefore, it is necessary to a kind of high-precision feed circuits, to meet application requirement.
Summary of the invention
The technical problems to be solved by the present invention are: a kind of high-precision feed circuit is provided, to promote output voltage precision,
Meet application requirement.
In order to solve the above-mentioned technical problem, a kind of technical solution that the present invention uses are as follows:
A kind of high-precision feed circuit, including control chip, first resistor, second resistance, 3rd resistor, the 4th resistance,
5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, first capacitor, the second capacitor, three poles
Pipe and three end adjustable shunt reference sources；
The control chip includes reference voltage pin, the reference voltage pin respectively with one end of the 9th resistance,
One end of ten resistance and one end electrical connection of first resistor, the other end of the 9th resistance are electrically connected with voltage output end, institute
The other end for stating the tenth resistance is electrically connected with ground terminal, and the other end of the first resistor is electrically connected with the collector of triode；
One end difference of one end of the second resistance, one end of 3rd resistor, one end of the 4th resistance and the 6th resistance
It is electrically connected with voltage output end, the other end of the second resistance is electrically connected with the emitter of triode, the 3rd resistor
The other end is electrically connected with one end of the base stage of triode and the 5th resistance respectively, the other end, the 4th resistance of the 5th resistance
The other end, one end of the second capacitor and cathode of the one end respectively with three end adjustable shunt reference source of the 8th resistance be electrically connected
It connects, the anode of three end adjustable shunt reference source is electrically connected with ground terminal, the other end and first capacitor of the 8th resistance
One end electrical connection, the reference pole of three end adjustable shunt reference source respectively with the other end of the 6th resistance, the second capacitor
One end of the other end, the other end of first capacitor and the 7th resistance is electrically connected, the other end and the ground terminal electricity of the 7th resistance
Connection.
The another technical solution that the present invention uses are as follows:
A kind of high-precision feed circuit, including control chip, first resistor, second resistance, 3rd resistor, the 4th resistance,
5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, first capacitor, the second capacitor, metal-oxide-semiconductor
With three end adjustable shunt reference sources；
The control chip includes reference voltage pin, the reference voltage pin respectively with one end of the 9th resistance,
One end of ten resistance and one end electrical connection of first resistor, the other end of the 9th resistance are electrically connected with voltage output end, institute
The other end for stating the tenth resistance is electrically connected with ground terminal, and the other end of the first resistor is electrically connected with the source electrode of metal-oxide-semiconductor；
One end difference of one end of the second resistance, one end of 3rd resistor, one end of the 4th resistance and the 6th resistance
Be electrically connected with voltage output end, the other end of the second resistance is electrically connected with the drain electrode of metal-oxide-semiconductor, the 3rd resistor it is another
End is electrically connected with one end of the grid of metal-oxide-semiconductor and the 5th resistance respectively, the other end of the 5th resistance, the 4th resistance it is another
The one end at end, one end of the second capacitor and the 8th resistance is electrically connected with the cathode of three end adjustable shunt reference source respectively, institute
The anode for stating three end adjustable shunt reference sources is electrically connected with ground terminal, the other end of the 8th resistance and one end of first capacitor
Electrical connection, the reference pole of three end adjustable shunt reference source respectively with the other end of the 6th resistance, the second capacitor the other end,
The electrical connection of one end of the other end of first capacitor and the 7th resistance, the other end of the 7th resistance are electrically connected with ground terminal.
The beneficial effects of the present invention are:
A kind of high-precision feed circuit provided by the invention, is determined by the 9th resistance, the tenth resistance and feedback compensation circuit
The output voltage of constant voltage output end, wherein when normal output voltage, appropriate adjustment be electrically connected with PNP triode base stage
Three resistance and the second resistance being electrically connected with PNP triode emitter allow PNP triode work in linear zone.First resistor is
The current-limiting resistance of feedback current.When the circuit is operating, the 4th resistance and the 5th resistance are the work of three end adjustable shunt reference sources
State provides steady state operating current, while the 4th resistance provides work electricity to the voltage-reference of three end adjustable shunt reference sources
Stream, when normal work, electric current is punctured by three end adjustable shunt reference sources, three end adjustable shunt reference sources offer, one 2.5V's
Reference voltage, then ratio enlargement is carried out by the 6th resistance and the 7th resistance for output voltage.8th resistance, first capacitor and second
Capacitor is the loop compensation networks of circuit.It is compared with traditional scheme, this high-precision feed circuit loop stability, the output to product
Voltage accuracy, load regulation and Serial regulation have and significantly improve.In addition it further uses metal-oxide-semiconductor and replaces PNP triode,
The precision of output voltage can further be promoted.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing output voltage feedback in background technique；
Fig. 2 is a kind of circuit diagram of the embodiment one of high-precision feed circuit of the invention；
Fig. 3 is a kind of physical circuit figure of the embodiment one of high-precision feed circuit of the invention；
Fig. 4 is a kind of circuit diagram of the embodiment two of high-precision feed circuit of the invention；
Fig. 5 is a kind of physical circuit figure of the embodiment two of high-precision feed circuit of the invention；
Label declaration:
U1, control chip；FB, reference voltage pin；
R1, first resistor；R2, second resistance；R3,3rd resistor；R4, the 4th resistance；R5, the 5th resistance；R6, the 6th electricity
Resistance；R7, the 7th resistance；R8, the 8th resistance；RU, the 9th resistance；
RL, the tenth resistance；
C1, first capacitor；C2, the second capacitor；
Q1, triode；Q2, metal-oxide-semiconductor；
U2, three end adjustable shunt reference sources；K, cathode；A, anode；REF, with reference to pole；
Vout, voltage output end；
GND, ground terminal；
DZ1, diode.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
It should be understood that the RU in the R1 in R1 not instead of Fig. 1 in Fig. 2-5, Fig. 2-5 is the R1 in Fig. 1；Fig. 2-
RL in the R2 in R2 not instead of Fig. 1 in 5, Fig. 2-5 is the R2 in Fig. 1.
Referring to figure 2. and Fig. 3, a kind of high-precision feed circuit provided by the invention, including control chip, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
Ten resistance, first capacitor, the second capacitor, triode and three end adjustable shunt reference sources；
The control chip includes reference voltage pin, the reference voltage pin respectively with one end of the 9th resistance,
One end of ten resistance and one end electrical connection of first resistor, the other end of the 9th resistance are electrically connected with voltage output end, institute
The other end for stating the tenth resistance is electrically connected with ground terminal, and the other end of the first resistor is electrically connected with the collector of triode；
One end difference of one end of the second resistance, one end of 3rd resistor, one end of the 4th resistance and the 6th resistance
It is electrically connected with voltage output end, the other end of the second resistance is electrically connected with the emitter of triode, the 3rd resistor
The other end is electrically connected with one end of the base stage of triode and the 5th resistance respectively, the other end, the 4th resistance of the 5th resistance
The other end, one end of the second capacitor and cathode of the one end respectively with three end adjustable shunt reference source of the 8th resistance be electrically connected
It connects, the anode of three end adjustable shunt reference source is electrically connected with ground terminal, the other end and first capacitor of the 8th resistance
One end electrical connection, the reference pole of three end adjustable shunt reference source respectively with the other end of the 6th resistance, the second capacitor
One end of the other end, the other end of first capacitor and the 7th resistance is electrically connected, the other end and the ground terminal electricity of the 7th resistance
Connection.
As can be seen from the above description, the beneficial effects of the present invention are:
A kind of high-precision feed circuit provided by the invention, is determined by the 9th resistance, the tenth resistance and feedback compensation circuit
The output voltage of constant voltage output end, wherein when normal output voltage, appropriate adjustment be electrically connected with PNP triode base stage
Three resistance and the second resistance being electrically connected with PNP triode emitter allow PNP triode work in linear zone.First resistor is
The current-limiting resistance of feedback current.When the circuit is operating, the 4th resistance and the 5th resistance are the work of three end adjustable shunt reference sources
State provides steady state operating current, while the 4th resistance provides work electricity to the voltage-reference of three end adjustable shunt reference sources
Stream, when normal work, electric current is punctured by three end adjustable shunt reference sources, three end adjustable shunt reference sources offer, one 2.5V's
Reference voltage, then ratio enlargement is carried out by the 6th resistance and the 7th resistance for output voltage.8th resistance, first capacitor and second
Capacitor is the loop compensation networks of circuit.It is compared with traditional scheme, this high-precision feed circuit loop stability, the output to product
Voltage accuracy, load regulation and Serial regulation have and significantly improve.
It further, further include diode, the other end of the 9th resistance, one end of second resistance, 3rd resistor
One end and one end of the 4th resistance are electrically connected to each other to be electrically connected with the anode of diode afterwards, and the cathode and voltage of the diode are defeated
Outlet electrical connection.
As can be seen from the above description, this diode is zener diode, in order to when designing 36V and the above voltage,
Since the maximum working voltage of TL431 is 36V, if being added without voltage-stabiliser tube, the possible punch through damage of TL431, therefore play protection
The effect of TL431 device.
Further, the model TL431 of three end adjustable shunt reference source.
With continued reference to Fig. 4 and Fig. 5, the present invention also provides a kind of high-precision feed circuit, including control chip, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
Ten resistance, first capacitor, the second capacitor, metal-oxide-semiconductor and three end adjustable shunt reference sources；
The control chip includes reference voltage pin, the reference voltage pin respectively with one end of the 9th resistance,
One end of ten resistance and one end electrical connection of first resistor, the other end of the 9th resistance are electrically connected with voltage output end, institute
The other end for stating the tenth resistance is electrically connected with ground terminal, and the other end of the first resistor is electrically connected with the source electrode of metal-oxide-semiconductor；
One end difference of one end of the second resistance, one end of 3rd resistor, one end of the 4th resistance and the 6th resistance
Be electrically connected with voltage output end, the other end of the second resistance is electrically connected with the drain electrode of metal-oxide-semiconductor, the 3rd resistor it is another
End is electrically connected with one end of the grid of metal-oxide-semiconductor and the 5th resistance respectively, the other end of the 5th resistance, the 4th resistance it is another
The one end at end, one end of the second capacitor and the 8th resistance is electrically connected with the cathode of three end adjustable shunt reference source respectively, institute
The anode for stating three end adjustable shunt reference sources is electrically connected with ground terminal, the other end of the 8th resistance and one end of first capacitor
Electrical connection, the reference pole of three end adjustable shunt reference source respectively with the other end of the 6th resistance, the second capacitor the other end,
The electrical connection of one end of the other end of first capacitor and the 7th resistance, the other end of the 7th resistance are electrically connected with ground terminal.
As can be seen from the above description, the beneficial effects of the present invention are: further use metal-oxide-semiconductor instead of PNP triode, equally
It can be realized the technical effect that the first scheme is declared, but preferably the first scheme, reason are:
The control mechanism of triode and metal-oxide-semiconductor is distinguishing.Triode is current-mode control device, and metal-oxide-semiconductor is electricity
Die mould control device, triode can control collector current by control base current, and metal-oxide-semiconductor in this programme with regard to phase
When then a switch, electric current need current-limiting resistance to be controlled, therefore the control effect of metal-oxide-semiconductor is slightly poor.
It further, further include diode, the other end of the 9th resistance, one end of second resistance, 3rd resistor
One end and one end of the 4th resistance are electrically connected to each other to be electrically connected with the anode of diode afterwards, and the cathode and voltage of the diode are defeated
Outlet electrical connection.
Further, the model TL431 of three end adjustable shunt reference source.
Referring to figure 2. -3, the embodiment of the present invention one are as follows:
A kind of high-precision feed circuit provided by the invention, including control chip U1, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance RU,
Tenth resistance RL, first capacitor C1, the second capacitor C2, triode Q1 and three end adjustable shunt reference source U2；Three end is adjustable
The model TL431 of shunt reference source U2.
The control chip U1 includes reference voltage pin FB, and the reference voltage pin FB is respectively with the 9th resistance RU's
One end of one end, one end of the tenth resistance RL and first resistor R1 is electrically connected, and the other end and voltage of the 9th resistance RU is defeated
Outlet Vout electrical connection, the other end of the tenth resistance RL are electrically connected with ground terminal GND, the other end of the first resistor R1
It is electrically connected with the collector of triode Q1；
One end of the second resistance R2, one end of 3rd resistor R3, one end of the 4th resistance R4 and the 6th resistance R6
One end is electrically connected with voltage output end Vout respectively, and the emitter of the other end and triode Q1 of the second resistance R2 is electrically connected
It connecing, the other end of the 3rd resistor R3 is electrically connected with one end of the base stage of triode Q1 and the 5th resistance R5 respectively, and described
The other end of five resistance R5, the other end of the 4th resistance R4, one end of the second capacitor R2 and the 8th resistance R8 one end respectively with
The cathode K of the three ends adjustable shunt reference source U2 is electrically connected, the anode A and ground terminal of the three ends adjustable shunt reference source U2
GND electrical connection, the other end of the 8th resistance R8 are electrically connected with one end of first capacitor C1, the three ends adjustable shunt benchmark
The reference pole REF of source U2 respectively with the other end of the 6th resistance R6, the other end of the second capacitor C2, first capacitor C1 the other end
It is electrically connected with one end of the 7th resistance R7, the other end of the 7th resistance R7 is electrically connected with ground terminal GND.
Above-mentioned high-precision feed circuit further includes diode DZ1, the other end, the second resistance R2 of the 9th resistance RU
One end, one end of 3rd resistor R3 and one end of the 4th resistance R4 be electrically connected to each other afterwards with diode DZ1 anode be electrically connected,
The cathode of the diode DZ1 is electrically connected with voltage output end Vout.
With continued reference to Fig. 4 and Fig. 5, the embodiment of the present invention two are as follows:
The present invention also provides a kind of high-precision feed circuit, including control chip U1, first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance
RU, the tenth resistance RL, first capacitor C1, the second capacitor C2, metal-oxide-semiconductor Q2 and three end adjustable shunt reference source U2；Three end can
Adjust the model TL431 of shunt reference source U2.
The control chip U1 includes reference voltage pin FB, and the reference voltage pin FB is respectively with the 9th resistance RU's
One end of one end, one end of the tenth resistance RL and first resistor R1 is electrically connected, and the other end and voltage of the 9th resistance RU is defeated
Outlet Vout electrical connection, the other end of the tenth resistance RL are electrically connected with ground terminal GND, the other end of the first resistor R1
It is electrically connected with the source electrode of metal-oxide-semiconductor Q2；
One end of the second resistance R2, one end of 3rd resistor R3, one end of the 4th resistance R4 and the 6th resistance R6
One end is electrically connected with voltage output end Vout respectively, and the other end of the second resistance R2 is electrically connected with the drain electrode of metal-oxide-semiconductor Q2, institute
The other end for stating 3rd resistor R3 is electrically connected with one end of the grid of metal-oxide-semiconductor Q2 and the 5th resistance R5 respectively, the 5th resistance
The other end of R5, the other end of the 4th resistance R4, one end of the second capacitor C2 and the 8th resistance R8 one end respectively with described three
Hold the cathode K electrical connection of adjustable shunt reference source U2, anode A and ground terminal the GND electricity of the three ends adjustable shunt reference source U2
Connection, the other end of the 8th resistance R8 are electrically connected with one end of first capacitor C1, the three ends adjustable shunt reference source U2
Reference pole REF respectively with the other end of the 6th resistance R6, the other end of the second capacitor C2, the other end of first capacitor C1 and
One end of seven resistance R7 is electrically connected, and the other end of the 7th resistance R7 is electrically connected with ground terminal GND.
Above-mentioned high-precision feed circuit further includes diode DZ1, the other end, the second resistance R2 of the 9th resistance RU
One end, one end of 3rd resistor R3 and one end of the 4th resistance R4 be electrically connected to each other afterwards with diode DZ1 anode be electrically connected,
The cathode of the diode DZ1 is electrically connected with voltage output end Vout.
In conclusion a kind of high-precision feed circuit provided by the invention, is mended by the 9th resistance, the tenth resistance and feedback
The output voltage that circuit determines voltage output end is repaid, wherein when normal output voltage, appropriate adjustment and PNP triode base stage electricity
The 3rd resistor of connection and the second resistance being electrically connected with PNP triode emitter allow PNP triode work in linear zone.The
One resistance is the current-limiting resistance of feedback current.When the circuit is operating, the 4th resistance and the 5th resistance are three end adjustable shunt benchmark
The working condition in source provides steady state operating current, while the 4th resistance is provided to the voltage-reference of three end adjustable shunt reference sources
Operating current, when normal work, electric current passes through three end adjustable shunt reference sources and punctures, and three end adjustable shunt reference sources provide one
The reference voltage of 2.5V, then ratio enlargement is carried out by the 6th resistance and the 7th resistance for output voltage.8th resistance, first capacitor
It is the loop compensation networks of circuit with the second capacitor.It is compared with traditional scheme, this high-precision feed circuit loop stability, to product
Output voltage precision, load regulation and Serial regulation have and significantly improve.In addition metal-oxide-semiconductor is further used instead of PNP
Triode can further promote the precision of output voltage.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (6)
1. a kind of high-precision feed circuit, which is characterized in that including control chip, first resistor, second resistance, 3rd resistor,
4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, first capacitor, second
Capacitor, triode and three end adjustable shunt reference sources；
The control chip includes reference voltage pin, the reference voltage pin respectively with one end of the 9th resistance, the tenth electricity
One end of resistance and the electrical connection of one end of first resistor, the other end of the 9th resistance are electrically connected with voltage output end, and described the
The other end of ten resistance is electrically connected with ground terminal, and the other end of the first resistor is electrically connected with the collector of triode；
One end of the second resistance, one end of 3rd resistor, one end of the 4th resistance and the 6th resistance one end respectively with electricity
Press output end electrical connection, the other end of the second resistance is electrically connected with the emitter of triode, the 3rd resistor it is another
End is electrically connected with one end of the base stage of triode and the 5th resistance respectively, the other end of the 5th resistance, the 4th resistance it is another
One end of one end, one end of the second capacitor and the 8th resistance is electrically connected with the cathode of three end adjustable shunt reference source respectively,
The anode of three end adjustable shunt reference source is electrically connected with ground terminal, and the one of the other end of the 8th resistance and first capacitor
End electrical connection, the reference pole of three end adjustable shunt reference source respectively with the other end of the 6th resistance, the second capacitor it is another
One end electrical connection at end, the other end of first capacitor and the 7th resistance, the other end of the 7th resistance are electrically connected with ground terminal.
2. a kind of high-precision feed circuit according to claim 1, which is characterized in that it further include diode, the described 9th
The other end of resistance, one end of second resistance, one end of 3rd resistor and the 4th resistance one end be electrically connected to each other after with two poles
The anode electrical connection of pipe, the cathode of the diode are electrically connected with voltage output end.
3. a kind of high-precision feed circuit according to claim 1, which is characterized in that three end adjustable shunt reference source
Model TL431.
4. a kind of high-precision feed circuit, which is characterized in that including control chip, first resistor, second resistance, 3rd resistor,
4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, first capacitor, second
Capacitor, metal-oxide-semiconductor and three end adjustable shunt reference sources；
The control chip includes reference voltage pin, the reference voltage pin respectively with one end of the 9th resistance, the tenth electricity
One end of resistance and the electrical connection of one end of first resistor, the other end of the 9th resistance are electrically connected with voltage output end, and described the
The other end of ten resistance is electrically connected with ground terminal, and the other end of the first resistor is electrically connected with the source electrode of metal-oxide-semiconductor；
One end of the second resistance, one end of 3rd resistor, one end of the 4th resistance and the 6th resistance one end respectively with electricity
Output end electrical connection is pressed, the other end of the second resistance is electrically connected with the drain electrode of metal-oxide-semiconductor, the other end point of the 3rd resistor
Be not electrically connected with one end of the grid of metal-oxide-semiconductor and the 5th resistance, the other end of the 5th resistance, the 4th resistance the other end,
One end of second capacitor and one end of the 8th resistance are electrically connected with the cathode of three end adjustable shunt reference source respectively, and described three
The anode of end adjustable shunt reference source is electrically connected with ground terminal, and the other end of the 8th resistance and one end of first capacitor are electrically connected
Connect, the reference pole of three end adjustable shunt reference source respectively with the other end of the 6th resistance, the other end of the second capacitor, first
The electrical connection of one end of the other end of capacitor and the 7th resistance, the other end of the 7th resistance are electrically connected with ground terminal.
5. a kind of high-precision feed circuit according to claim 4, which is characterized in that it further include diode, the described 9th
The other end of resistance, one end of second resistance, one end of 3rd resistor and the 4th resistance one end be electrically connected to each other after with two poles
The anode electrical connection of pipe, the cathode of the diode are electrically connected with voltage output end.
6. a kind of high-precision feed circuit according to claim 4, which is characterized in that three end adjustable shunt reference source
Model TL431.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578757.3A CN109445502B (en) | 2018-12-24 | 2018-12-24 | High-precision feedback circuit |
| CN202410062877.7A CN117950439A (en) | 2018-12-24 | 2018-12-24 | Feedback circuit for control chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578757.3A CN109445502B (en) | 2018-12-24 | 2018-12-24 | High-precision feedback circuit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410062877.7A Division CN117950439A (en) | 2018-12-24 | 2018-12-24 | Feedback circuit for control chip |
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| CN109445502A true CN109445502A (en) | 2019-03-08 |
| CN109445502B CN109445502B (en) | 2024-02-02 |
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| CN201811578757.3A Active CN109445502B (en) | 2018-12-24 | 2018-12-24 | High-precision feedback circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163922A (en) * | 2011-05-13 | 2011-08-24 | 深圳航天科技创新研究院 | Magnetic isolating feedback circuit containing voltage signal and current signal of switch power supply |
| CN104300773A (en) * | 2014-10-17 | 2015-01-21 | 深圳航天科技创新研究院 | Simple self-adaptation dummy-load circuit |
| CN204559208U (en) * | 2015-05-15 | 2015-08-12 | 富阳怀邦机械有限公司 | A kind of ice storing time power supply circuits |
| CN107453608A (en) * | 2017-09-28 | 2017-12-08 | 广东美的厨房电器制造有限公司 | A kind of feedback circuit and micro-wave oven |
| CN208969530U (en) * | 2018-12-24 | 2019-06-11 | 厦门能瑞康电子有限公司 | A kind of high-precision feed circuit |
-
2018
- 2018-12-24 CN CN202410062877.7A patent/CN117950439A/en active Pending
- 2018-12-24 CN CN201811578757.3A patent/CN109445502B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163922A (en) * | 2011-05-13 | 2011-08-24 | 深圳航天科技创新研究院 | Magnetic isolating feedback circuit containing voltage signal and current signal of switch power supply |
| CN104300773A (en) * | 2014-10-17 | 2015-01-21 | 深圳航天科技创新研究院 | Simple self-adaptation dummy-load circuit |
| CN204559208U (en) * | 2015-05-15 | 2015-08-12 | 富阳怀邦机械有限公司 | A kind of ice storing time power supply circuits |
| CN107453608A (en) * | 2017-09-28 | 2017-12-08 | 广东美的厨房电器制造有限公司 | A kind of feedback circuit and micro-wave oven |
| CN208969530U (en) * | 2018-12-24 | 2019-06-11 | 厦门能瑞康电子有限公司 | A kind of high-precision feed circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117950439A (en) | 2024-04-30 |
| CN109445502B (en) | 2024-02-02 |
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