CN109600041A - A kind of low ripple regulated power supply output circuit - Google Patents
A kind of low ripple regulated power supply output circuit Download PDFInfo
- Publication number
- CN109600041A CN109600041A CN201910032757.1A CN201910032757A CN109600041A CN 109600041 A CN109600041 A CN 109600041A CN 201910032757 A CN201910032757 A CN 201910032757A CN 109600041 A CN109600041 A CN 109600041A
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- CN
- China
- Prior art keywords
- power supply
- output
- voltage
- input port
- differential amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention discloses a kind of low ripple regulated power supply output circuits, including DCDC power supply unit, the adjustable LDO linear voltage regulator of output voltage, the adjustable voltage regulation unit of output voltage and differential amplifier circuit, the output port of DCDC power supply unit is connected with the input port of LDO linear voltage regulator, and the output end of voltage regulation unit is connected with the feed back input port of LDO linear voltage regulator；The first input port of differential amplifier circuit is connected with the input port of LDO linear voltage regulator, second input port of differential amplifier circuit is connected with the output port of LDO linear voltage regulator, and the output port of differential amplifier circuit is connected with the feed back input port of DCDC power supply unit.The present invention is practical, structure is simple, at low cost, need to only carry out configuring the adjusting that can be completed to entire circuit to LDO linear voltage regulator, guarantees that power supply ripple is also very low while high-precision exports.
Description
Technical field
The present invention relates to regulated power supply output circuits.Specifically, the present invention relates to a kind of outputs of low ripple regulated power supply
Circuit.
Background technique
Currently, liquid crystal module is higher and higher to the required precision of operating voltage, while also requiring lower power supply ripple.Electricity
There is the even biggish shake flashing of water ripples in the ripple excessive screen that will lead in source.
The method of traditional reduction ripple has following several:
The first, increasing second level LC filter circuit reduces ripple, and the method effect is preferable, but there are direct currents for inductance itself
Resistance, when connecting load, load current flows through inductance will generate pressure drop on inductance, and with loading different pressure drops also not
Together, it is unfavorable for the high-precision output of power supply.
The second, ripple is reduced by adjusting power parameter, by body when often replacing inductance and capacitance parameter after PCB times plates
Product limitation, different surely to have suitable device to replace, the method is different surely to achieve the effect that satisfied, while ripple and PCB
Fabric swatch also has much relations, and the ripple that same circuit measures every time on different boards is different, if every piece of board all needs
The loop parameter of power supply is adjusted, working efficiency is too low.
Third increases LDO linear voltage regulator by the output port in DCDC power supply unit to reduce ripple, the method effect
Fruit is preferable, but when needing to adjust output voltage, needs the output electricity of the output voltage to DCDC power supply unit and LDO respectively
Pressure carries out voltage adjusting, higher cost；When output voltage needs dynamic regulation, needs DC-DC and LDO to link and adjust, increase
The complexity of control program.
Existing scientific and technical literature also discloses some solutions, and documents CN107358919A discloses a kind of name
The referred to as patent of invention of " a kind of OLED screen curtain grey menu water ripples inhibit and removal device ", in the invention, main control chip is logical
It crosses high-precision potentiometer to go that the output voltage of DCDC power supply and the output voltage of LDO is respectively configured, then enables DCDC power supply respectively
And LDO, realize that output voltage is adjustable.The invention circuit complexity is high, needs that DCDC power supply and LDO is respectively configured, and adopt
Make increased costs with two sets of high-precision potentiometers.
Summary of the invention
The present invention be in order to overcome deficiency existing for above-mentioned background technique, provide it is a kind of only need to LDO linear voltage regulator into
Row configuration, it is no longer necessary to individually DCDC power supply unit be configured, structure is simple, and lower-cost low ripple regulated power supply is defeated
Circuit out.
To realize the purpose, the present invention adopts the following technical scheme:
A kind of low ripple regulated power supply output circuit, including the adjustable LDO linear voltage stabilization of DCDC power supply unit, output voltage
Device, the output port of the DCDC power supply unit are connected with the input port of the LDO linear voltage regulator, which is characterized in that also
Including the adjustable voltage regulation unit of output voltage and differential amplifier circuit, the output end of the voltage regulation unit with it is described
The feed back input port of LDO linear voltage regulator is connected, the output voltage that the voltage regulation unit passes through its output end of adjusting
To adjust the output voltage of the LDO linear voltage regulator；The first input port of the differential amplifier circuit and the LDO line
Property voltage-stablizer input port be connected, the second input port of the differential amplifier circuit is defeated with the LDO linear voltage regulator
Exit port is connected, and the output port of the differential amplifier circuit is connected with the feed back input port of the DCDC power supply unit, institute
Differential amplifier circuit is stated to be used to that the difference between the input signal and output signal of the LDO linear voltage regulator is amplified and exported
To the feed back input port of the DCDC power supply unit.
Preferably, the voltage regulation unit may include DAC digital analog converter.
Preferably, the voltage regulation unit may include adjustable resistance, and the adjustable resistance can be adjusted by adjusting dividing
The output voltage of the whole voltage regulation unit.
Preferably, the differential amplifier circuit may include operational amplifier and 4 resistance, the output of the operational amplifier
End is the output port of the differential amplifier circuit, the output end of the operational amplifier and the inverting input terminal of operational amplifier
Between be connected with first resistor, the first input port of the inverting input terminal of the operational amplifier and the differential amplifier circuit
It is connected with second resistance, the second input port of the non-inverting input terminal of the operational amplifier and the differential amplifier circuit before
Between be connected with the 4th resistance, be grounded after the non-inverting input terminal access 3rd resistor of the operational amplifier.
Preferably, the output voltage of the DCDC power supply unit can be higher than the output voltage of the LDO linear voltage regulator.
Preferably, the DCDC power supply unit can be LM5117.
Preferably, the LDO linear voltage regulator can be LT3083.
Preferably, the DAC digital-to-analogue conversion can be AD5683R.
Preferably, the operational amplifier can be OPA2188.
The present invention, which is used, increases the circuit structure of LDO linear voltage regulator in the output port of DCDC power supply unit, using difference
Point amplifying circuit is by the difference amplification between the output signal of DCDC power supply unit and the output signal of LDO linear voltage regulator and defeated
Out to the feed back input port of the DCDC power supply unit, the output voltage of DCDC power supply unit is made to follow LDO linear voltage regulator
Output voltage variation and change, guarantee there is a fixed pressure difference between the input signal of LDO and output signal, realization DCDC
The two-stage joint debugging of power supply unit output voltage and LDO linear stabilizer output voltage.
The present invention is adjusted using the input voltage of the feed back input port of voltage regulation unit control LDO linear voltage regulator
Save the output voltage of LDO linear voltage regulator, and then the achievable adjusting to entire circuit.
The present invention is practical, structure is simple, at low cost, and configuration need to be only carried out to LDO linear voltage regulator can be completed pair
The adjusting of entire circuit guarantees that power supply ripple is also very low while high-precision exports.
Through the following description and in conjunction with the attached drawings, the present invention will become more fully apparent, these attached drawings are used to explain the present invention
Embodiment.
Detailed description of the invention
Fig. 1 is the schematic diagram of the embodiment of the present invention.
Specific embodiment
Embodiment 1, as shown in Figure 1, a kind of low ripple regulated power supply output circuit includes a DCDC power supply unit, one
LDO linear voltage regulator, a voltage regulation unit V- set, the output voltage of the LDO linear voltage regulator is adjustable, the DCDC
The output port Out of power supply unit is connected with the input port Vin of the LDO linear voltage regulator, the DCDC power supply unit
Output voltage is higher than the output voltage of the LDO linear voltage regulator.The output end of the voltage regulation unit V-set with it is described
The feed back input port Adj of LDO linear voltage regulator is connected, and the voltage regulation unit V-set is by adjusting its output end
Output voltage adjusts the output voltage of the LDO linear voltage regulator.
The circuit structure of adjustable resistance partial pressure can be used in the voltage regulation unit V-set, and the adjustable resistance passes through tune
It is whole to divide to adjust the output voltage of the voltage regulation unit；DAC number mould can also be used in the voltage regulation unit V-set
Quasi- converter controls the output voltage of the voltage regulation unit, and AD5683R can be selected in the DAC digital-to-analogue conversion.It is described
The structure of voltage regulation unit V-set is not limited to above two.
The present embodiment further includes a differential amplifier circuit, and the differential amplifier circuit is used to the LDO linear voltage stabilization
Difference between the input signal and output signal of device is amplified and is exported to the feed back input port FB of the DCDC power supply unit.
The first input port 1 of the differential amplifier circuit is connected with the input port Vin of the LDO linear voltage regulator, the difference
Second input port 2 of amplifying circuit is connected with the output port Vout of the LDO linear voltage regulator, the differential amplifier circuit
Output port 3 be connected with the feed back input port FB of the DCDC power supply unit.
The differential amplifier circuit includes that an operational amplifier U1 and four resistance R1, R2, R3, R4, the operation are put
The output end of big device U1 is the output port 3 of the differential amplifier circuit, the output end of the operational amplifier and the DCDC
The feed back input port FB of power supply unit is connected, the output end of the operational amplifier U1 and the anti-phase input of operational amplifier U1
First resistor R1, the inverting input terminal of the operational amplifier U1 and the first of the differential amplifier circuit are connected between end
Second resistance R2, the non-inverting input terminal of the operational amplifier and the differential amplifier circuit are connected with before input port 1
The 4th resistance R4 is connected between second input port 2, after the non-inverting input terminal of the operational amplifier accesses 3rd resistor R3
Ground connection.
In the present embodiment, the output voltage of the differential amplifier circuit is V3, the first input of the differential amplifier circuit
The input voltage of port 1 is V1, the input voltage of the second input port 2 of the differential amplifier circuit is V2, then
V3=(V1-V2) × R1/R2 --- formula 1
In real work, the internal reference voltage of the DCDC power supply unit is VFB, anti-when the DCDC power supply unit
Present the input voltage V of input port FB3With VFBWhen equal, the DCDC power supply unit reaches balance, the DCDC power supply unit
Output voltage V1Stablize.
The circuit design of the present embodiment designs the LDO firstly the need of according to the performance parameter of selected LDO linear voltage regulator
Difference, as V between the input voltage and output voltage of linear voltage regulator1-V2, the internal reference electricity of selected DCDC power supply unit
Pressure is VFB, substitute into following formula:
VFB=(V1-V2) × R1/R2 --- formula 2 can calculate resistance R1 divided by the value of resistance R2.It is put further according to difference
The design of big circuit, can give the resistance value of resistance R1, R2, R3, R4.
The present embodiment in actual operation, when the output voltage for adjusting the voltage regulation unit V-set makes the LDO line
Property stabilizer output voltage V2When raising, formula 1 is substituted into it is found that R1, R2 are constant, V1-V2Reduce, V3It reduces, the DCDC electricity
The internal reference voltage V of source unitFBGreater than V3, circuit disequilibrium, output voltage will be turned up in the DCDC power supply unit at this time
Value V1, so that V3Again with VFBEqual, circuit reaches balance again, stablizes output.
When the output voltage for adjusting the voltage regulation unit V-set makes the LDO linear stabilizer output voltage V2Drop
When low, formula 1 is substituted into it is found that R1, R2 are constant, V1-V2Increase, V3It increases, the internal reference electricity of the DCDC power supply unit
Press VFBLess than V3, circuit disequilibrium, the DCDC power supply unit will turn down output voltage values V at this time1, so that V3Again with VFB
Equal, circuit reaches balance again, stablizes output.
When needing to reset difference between the input voltage of LDO and output voltage, according to formula 2, it is only necessary to adjust
The resistance value of resistance R1, R2, R3, R4.
In the present embodiment, LM5117 is can be selected in the DCDC power supply unit, and the LDO linear voltage regulator can be selected
OPA2188 can be selected in LT3083, the operational amplifier U1.
Combining most preferred embodiment above, invention has been described, but the invention is not limited to implementations disclosed above
Example, and various modifications, equivalent combinations according to the essence of the present invention should be covered.
Claims (9)
1. a kind of low ripple regulated power supply output circuit, including the adjustable LDO linear voltage stabilization of DCDC power supply unit, output voltage
Device, the output port of the DCDC power supply unit are connected with the input port of the LDO linear voltage regulator, which is characterized in that also
Including the adjustable voltage regulation unit of output voltage and differential amplifier circuit, the output end of the voltage regulation unit with it is described
The feed back input port of LDO linear voltage regulator is connected, the output voltage that the voltage regulation unit passes through its output end of adjusting
To adjust the output voltage of the LDO linear voltage regulator；The first input port of the differential amplifier circuit and the LDO are linear
The input port of voltage-stablizer is connected, the output of the second input port of the differential amplifier circuit and the LDO linear voltage regulator
Port is connected, and the output port of the differential amplifier circuit is connected with the feed back input port of the DCDC power supply unit, described
Differential amplifier circuit be used to the difference between the input signal and output signal of the LDO linear voltage regulator is amplified and export to
The feed back input port of the DCDC power supply unit.
2. a kind of low ripple regulated power supply output circuit according to claim 1, which is characterized in that the voltage adjusts single
Member includes DAC digital analog converter.
3. a kind of low ripple regulated power supply output circuit according to claim 1, which is characterized in that the voltage adjusts single
Member includes adjustable resistance, and the adjustable resistance adjusts the output voltage of the voltage regulation unit by adjusting dividing.
4. a kind of low ripple regulated power supply output circuit according to claim 1, which is characterized in that the differential amplification electricity
Road includes operational amplifier and 4 resistance, and the output end of the operational amplifier is the output port of the differential amplifier circuit,
First resistor, the operation amplifier are connected between the output end of the operational amplifier and the inverting input terminal of operational amplifier
Second resistance, the operation amplifier are connected with before the inverting input terminal of device and the first input port of the differential amplifier circuit
The 4th resistance, the operation amplifier are connected between the non-inverting input terminal of device and the second input port of the differential amplifier circuit
It is grounded after the non-inverting input terminal access 3rd resistor of device.
5. a kind of low ripple regulated power supply output circuit according to claim 1, which is characterized in that the DCDC power supply list
The output voltage of member is higher than the output voltage of the LDO linear voltage regulator.
6. a kind of low ripple regulated power supply output circuit according to claim 1, which is characterized in that the DCDC power supply list
Member is LM5117.
7. a kind of low ripple regulated power supply output circuit according to claim 1, which is characterized in that the LDO is linearly steady
Depressor is LT3083.
8. a kind of low ripple regulated power supply output circuit according to claim 2, which is characterized in that the DAC number mould
It is quasi- to be converted to AD5683R.
9. a kind of low ripple regulated power supply output circuit according to claim 4, which is characterized in that the operational amplifier
For OPA2188.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032757.1A CN109600041A (en) | 2019-01-14 | 2019-01-14 | A kind of low ripple regulated power supply output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032757.1A CN109600041A (en) | 2019-01-14 | 2019-01-14 | A kind of low ripple regulated power supply output circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109600041A true CN109600041A (en) | 2019-04-09 |
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ID=65966191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910032757.1A Pending CN109600041A (en) | 2019-01-14 | 2019-01-14 | A kind of low ripple regulated power supply output circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112631363A (en) * | 2020-12-18 | 2021-04-09 | 潍柴动力股份有限公司 | Power supply circuit and power supply method for supplying power to ECU (electronic control Unit) peripheral |
| CN112953214A (en) * | 2021-04-02 | 2021-06-11 | 海的电子科技(苏州)有限公司 | High-precision high-efficiency low-ripple adjustable constant-voltage circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873068A (en) * | 2009-04-27 | 2010-10-27 | 武汉市创佳源电子有限公司 | General integration technology for realizing high efficiency of linear power supply |
| CN102158078A (en) * | 2011-01-21 | 2011-08-17 | 华为终端有限公司 | Power amplifier power supply circuit and terminal |
| CN103178697A (en) * | 2013-03-01 | 2013-06-26 | 圣邦微电子（北京）股份有限公司 | Power system capable of outputting positive voltage and negative voltage |
-
2019
- 2019-01-14 CN CN201910032757.1A patent/CN109600041A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873068A (en) * | 2009-04-27 | 2010-10-27 | 武汉市创佳源电子有限公司 | General integration technology for realizing high efficiency of linear power supply |
| CN102158078A (en) * | 2011-01-21 | 2011-08-17 | 华为终端有限公司 | Power amplifier power supply circuit and terminal |
| CN103178697A (en) * | 2013-03-01 | 2013-06-26 | 圣邦微电子（北京）股份有限公司 | Power system capable of outputting positive voltage and negative voltage |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112631363A (en) * | 2020-12-18 | 2021-04-09 | 潍柴动力股份有限公司 | Power supply circuit and power supply method for supplying power to ECU (electronic control Unit) peripheral |
| CN112953214A (en) * | 2021-04-02 | 2021-06-11 | 海的电子科技(苏州)有限公司 | High-precision high-efficiency low-ripple adjustable constant-voltage circuit |
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Application publication date: 20190409 |
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