CN110429816A - A kind of switching power source control circuit - Google Patents
A kind of switching power source control circuit Download PDFInfo
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- CN110429816A CN110429816A CN201910719461.7A CN201910719461A CN110429816A CN 110429816 A CN110429816 A CN 110429816A CN 201910719461 A CN201910719461 A CN 201910719461A CN 110429816 A CN110429816 A CN 110429816A
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- circuit
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- power source
- switching power
- reference voltage
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- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of switching power source control circuits, are related to switch power technology field.The switching power source control circuit includes benchmark generation sub-circuit for outputting the reference voltage, the sampling filter sub-circuit sampled for the output voltage to switching power source control circuit and the comparator sub-circuit for being connected to benchmark generation sub-circuit and sampling filter sub-circuit, comparator sub-circuit receives reference voltage respectively and sampled voltage is compared, and exports comparison result；Switching power source control circuit further includes drive sub-circuits and partial pressure sub-circuit, and drive sub-circuits are connected to comparator sub-circuit, receives the comparison result of comparator sub-circuit, and for sampling filter sub-circuit to be connected；Partial pressure sub-circuit is connected to sampling filter sub-circuit by buffer, receives after sampled voltage is divided and is input to comparator sub-circuit.When technical solution of the present invention solves input power and output voltage pressure difference very little, the case where circuit can not work normally.
Description
Technical field
The present invention relates to switch power technology fields, more particularly to a kind of switching power source control circuit.
Background technique
Current constant pressure Switching Power Supply is needed through the accurate sampling and outputting voltage of sample circuit, then feedback voltage is sent into
To error amplifier, compared with reference voltage, generate pulse width modulated wave, realize constant output voltage.But work as sample circuit
When being realized by resistance pressure-dividing network, it is necessary to which two divider resistances increase circuit cost and complexity；On the other hand, right
In the PWM(Pulse width modulation of voltage-type, pulse width modulation) control mode, switching power circuit also needs
There is subharmonic concussion to prevent locking system in inductive current slope-compensation, and circuit design difficulty is big, at high cost.Also, in input electricity
When source voltage and output voltage pressure difference very little, constant pressure Switching Power Supply can not work.
Summary of the invention
The main purpose of the present invention is to provide a kind of switching power source control circuits, it is intended to guarantee Switching Power Supply normal table
Work.
To achieve the above object, the present invention provides a kind of switching power source control circuit, the switching power source control circuit packet
It includes benchmark generation sub-circuit for outputting the reference voltage, adopted for the output voltage to the switching power source control circuit
The sampling filter sub-circuit of sample and the comparator electricity for being connected to the benchmark generation sub-circuit and the sampling filter sub-circuit
Road, the comparator sub-circuit receives the reference voltage respectively and sampled voltage is compared, and exports comparison result；
The switching power source control circuit further includes drive sub-circuits and partial pressure sub-circuit, and the drive sub-circuits are connected to described
Comparator sub-circuit receives the comparison result of the comparator sub-circuit, and for the sampling filter sub-circuit to be connected；It is described
It divides sub-circuit and the sampling filter sub-circuit is connected to by buffer, receive after the sampled voltage is divided and be input to
The comparator sub-circuit.
Preferably, the reference voltage of the benchmark generation sub-circuit output includes the first reference voltage and the second benchmark
Voltage, the value of first reference voltage are more than or less than the value of second reference voltage.
Preferably, the comparator sub-circuit is by selecting switch to be connected to the benchmark generation sub-circuit, the selection
Switch connects one in first reference voltage and second reference voltage by the comparison result selection of the comparator
It is a.
Preferably, the switching power source control circuit further includes error amplifier sub-circuit, the error amplifier electricity
The first input end on road receives the output voltage, and the second input terminal of the error amplifier sub-circuit is connected to the benchmark
Generation sub-circuit, the output end of the error amplifier sub-circuit are connected to the benchmark generation sub-circuit.
Preferably, the benchmark generation sub-circuit also exports third reference voltage, and the value of the third reference voltage is institute
State the average value of the value of the first reference voltage and second reference voltage；The second output terminal of the error amplifier sub-circuit
Receive the third reference voltage.
Preferably, the sampling filter sub-circuit include first resistor, the first capacitor for being connected to the first resistor and
It is parallel to the inductance of the first resistor and first capacitor, sampling is also connected between the first resistor and the first capacitor
Voltage output end, the sampled voltage output end are connected to the input terminal of the buffer, the output end connection of the buffer
In the partial pressure sub-circuit.
Preferably, the sampling filter sub-circuit is also connected with the second capacitor, and one end of second capacitor is connected to institute
State the voltage output end of inductance and the switching power source control circuit, other end ground connection.
Preferably, the drive sub-circuits are connected to the sampling filter sub-circuit by PMOS tube and NMOS tube, described
The grid of PMOS tube and the NMOS tube is all connected to the driving circuit；The source electrode of the PMOS tube is connected to power supply, drain electrode
It is connected to one end of the drain electrode of the NMOS tube, one end of first resistor and inductance；The source electrode of the NMOS tube is grounded.
Technical solution of the present invention prevents leakage current shadow by being sampled and being isolated using value of the buffer to sampled voltage
Ring the charge and discharge time of sampling filter sub-circuit.Meanwhile being reduced to sampled voltage according to preset ratio using partial pressure sub-circuit,
Correspondingly, reference voltage can also be reduced according to same ratio, in this manner it is ensured that the grid source of the input field-effect tube in comparator
Pressure difference is enough to turn it on, when solving input power and output voltage pressure difference very little, the case where circuit can not work normally.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of switching power source control circuit of the present invention；
Fig. 2 is the circuit theory schematic diagram in switching power source control circuit embodiment of the present invention；
Fig. 3 is the waveform diagram of output voltage of the embodiment of the present invention and reference voltage.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The following further describes the present invention with reference to the drawings.
A kind of switching power source control circuit, as shown in Figure 1, the switching power source control circuit includes for outputting reference electricity
The benchmark generation sub-circuit of pressure, for the output voltage V to the switching power source control circuitOUTThe sampling filter sampled
Sub-circuit and the comparator sub-circuit for being connected to the benchmark generation sub-circuit and the sampling filter sub-circuit, the comparator
Sub-circuit receives the reference voltage and sampled voltage VX_ respectivelyRCIt is compared, and exports comparison result；
The switching power source control circuit further includes drive sub-circuits and partial pressure sub-circuit, and the drive sub-circuits are connected to described
Comparator sub-circuit receives the comparison result of the comparator sub-circuit, and for the sampling filter sub-circuit to be connected；It is described
It divides sub-circuit and the sampling filter sub-circuit is connected to by buffer buffer, receive the sampled voltage VX_RCDivided
The comparator sub-circuit is input to after pressure.
The embodiment of the present invention is using buffer buffer to sampled voltage VX_RCValue sampled and be isolated, prevent from leaking electricity
Stream influences the charge and discharge time of sampling filter sub-circuit.Meanwhile using partial pressure sub-circuit by sampled voltage VX_RCAccording to default ratio
Example is reduced to VX_RC2, correspondingly, reference voltage can also be reduced according to same ratio, in this manner it is ensured that the input in comparator
The grid source pressure difference of field-effect tube is enough to turn it on, and solves input power VDDWith output voltage VOUTWhen pressure difference very little, circuit without
The case where method works normally.
Preferably, the reference voltage of the benchmark generation sub-circuit output includes the first reference voltage VREFHWith second
Reference voltage VREFL, the first reference voltage VREFHValue be more than or less than the second reference voltage VREFLValue.In this reality
It applies in example, the first reference voltage VREFHValue be greater than the second reference voltage VREFLValue.
Preferably, the comparator sub-circuit is by selecting switch S to be connected to the benchmark generation sub-circuit, the selection
Switch S connects the first reference voltage V by the comparison result selection of the comparatorREFHWith the second reference voltage VREFLIn one
It is a.
In another embodiment, as shown in Fig. 2, the switching power source control circuit further includes error amplifier sub-circuit
The first input end of EA, the error amplifier sub-circuit EA receive the output voltage VOUT, the error amplifier sub-circuit
The second input terminal of EA is connected to the benchmark generation sub-circuit, and the output end of the error amplifier sub-circuit EA is connected to institute
State benchmark generation sub-circuit.The gain of reasonable step-up error amplifier sub-circuit, without being mended to error amplifier sub-circuit
It repays, while keeping higher bandwidth and switching frequency, circuit still has high bandwidth, Fast Load response and low output voltage ripple
The advantages of.
Preferably, the benchmark generation sub-circuit also exports third reference voltage VREF2, the third reference voltage VREF2's
Value is the first reference voltage VREFHWith the second reference voltage VREFLValue average value；The error amplifier sub-circuit EA
Second output terminal receive the third reference voltage VREF2。
By output voltage VOUTWith third reference voltage VREF2It is compared, can further improve constant pressure precision, meanwhile, In
When load sudden change, the output of error amplifier sub-circuit EA also can control third reference voltage VREF2Inverse change, so that inductance L
Electric current change rapidly to make up the variation of load current, obtain fabulous dynamic response performance.
Preferably, the sampling filter sub-circuit includes first resistor R0, be connected to the first resistor R0First capacitor
C0Be parallel to the first resistor R0With first capacitor C0Inductance L, the first resistor R0With the first capacitor C0Between
It is also connected with sampled voltage output end, the sampled voltage output end is connected to the input terminal of the buffer buffer, described
The output end of buffer buffer is connected to the partial pressure sub-circuit.
Preferably, the sampling filter sub-circuit is also connected with the second capacitor COUT, the second capacitor COUTOne end connect
It is connected to the voltage output end V of the inductance L and the switching power source control circuitOUT, other end ground connection.
Preferably, the drive sub-circuits are connected to the sampling filter sub-circuit by PMOS tube and NMOS tube, described
The grid of PMOS tube and the NMOS tube is all connected to the driving circuit；The source electrode of the PMOS tube is connected to power supply, drain electrode
It is connected to drain electrode, the first resistor R of the NMOS tube0One end and inductance L one end；The source electrode of the NMOS tube is grounded.
Working principle of the embodiment of the present invention are as follows:
When PMOS tube conducting, the voltage V of inductance LXIt is calculated by following equatioies:
VX= VDD - IL*Rds_pmos,
Wherein VDDFor supply voltage, ILFor the transient current for flowing through PMOS tube, Rds_pmosFor the conduction impedance of PMOS tube, due to
PMOS tube is in linear zone, Rds_pmosVery little can be ignored, therefore V at this timeX≈VDD；First resistor R0There are pressure differences at both ends, there is electricity
Stream passes through first resistor R0Flow into first capacitor C0, sampled voltage VX_RCIt increases；As sampled voltage VX_RCHigher than the first benchmark electricity
Press VREFHWhen, comparator sub-circuit output switching activity, control PMOS tube is closed, and NMOS tube is opened, while comparator sub-circuit selects
Connect the second reference voltage VREFL。
When NMOS transistor conduction, the voltage V of inductance LXIt is calculated by following equatioies:
VX= GND - IL′*Rds_nmos,
Wherein IL' it is the transient current for flowing through NMOS tube, Rds_nmosFor the conduction impedance of NMOS tube, since NMOS tube is in linear
Area, Rds_nmosVery little can be ignored, therefore V at this timeX≈GND=0；First resistor R0There are pressure differences at both ends, have electric current by first
Resistance R0Flow out first capacitor C0, sampled voltage VX_RCIt reduces；As sampled voltage VX_RCLower than the second reference voltage VREFLWhen, than
It compared with device sub-circuit output switching activity, controls PMOS tube and opens, NMOS tube is closed, while the first benchmark is connected in the selection of comparator sub-circuit
Voltage VREFH。
In switching power source control circuit steady operation, as shown in figure 3, first capacitor C0The charge and discharge in a cycle T
It balances and to maintain its both ends pressure difference consistent, therefore sampled voltage VX_RCAverage voltage be equal to output voltage VOUTAverage value,
And exporting has very big first capacitor C0, output voltage VOUTRipple very little, therefore VX_RCRipple very little.
Accordingly, presetting the charging and discharging currents that sampling filter sub-circuit generates is that first-order linear is approximate, VX_RCElectricity
Pressure is approximately linear change, can calculate charging and discharging currents:
The sluggish reference voltage △ U of benchmark generation sub-circuit passes through equation △ U=VREFH - VREFLIt calculates；
Ton stage current is calculated by following equatioies:
, wherein R0For first resistor R 0Resistance value；
Toff stage current is calculated by following equatioies:
；
Further according to capacitor charge and discharge current formulaFirst capacitor C can be calculated0The charge and discharge time:
,
, wherein C0For first capacitor C0Value.
Then the PWM switching frequency f under continuous conduction mode can be calculated by following equatioiesSW:
Wherein, by sampled voltage VX_RCIts average value is taken to be calculated.
It can be learnt by PWM switching frequency calculation equation: switching frequency and load current under continuous conduction mode
It is worth unrelated, unrelated with the value of inductance L and the second capacitor COUTValue it is unrelated, only by supply voltage (i.e. input voltage), output electricity
Press VOUT, first resistor R in sampling filter sub-circuit0Value and first capacitor C0Value and sluggishness reference voltage △ U it is related.
In a particular embodiment, first resistor R in setting sampling filter sub-circuit can be passed through0With first capacitor C0Value, come
Switching frequency is set.It, can be with without stability problem due to being not necessarily to error amplifier sub-circuit EA inside sampling filter sub-circuit
By switching frequency setting to higher value, reduce output voltage VOUTRipple.Since the switching frequency under continuous conduction mode is solid
It is fixed, therefore bandpass filter easily can be targetedly selected, to output voltage VOUTIt is filtered, further decreases defeated
Voltage V outOUTRipple greatly reduces subsequent filter design requirement.It can also be by the way that lesser sluggish reference voltage be arranged
△ U, to obtain lower inductance L current ripples and output voltage VOUTRipple, while can also improve constant pressure precision.
In further embodiments, error amplifier sub-circuit EA is by output voltage VOUTWith third reference voltage VREF2Into
Row compares, and controls the first reference voltage VREFHWith the second reference voltage VREFL, constant pressure precision is provided and accelerates dynamic response,
Middle third reference voltage VREF2For the first reference voltage VREFHWith the second reference voltage VREFLAverage value, i.e.,, sluggish reference voltage △ U pass through equation △ U=VREFH - VREFLIt calculates；
When load sudden change, load current is by original IOUT1It is reduced to I suddenlyOUT2, output voltage VOUTIt can increase, work as output
Voltage VOUTHigher than third reference voltage VREF2When, error amplifier sub-circuit EA can control the first reference voltage VREFHWith the second base
Quasi- voltage VREFLIt reducing simultaneously, while keeping sluggish reference voltage △ U constant, inductance L electric current also correspondingly can integrally reduce, with
Quickly by output voltage VOUTModulation returns to normal value.
It should be understood that the above is only a preferred embodiment of the present invention, the scope of the patents of the invention cannot be therefore limited,
It is all to utilize equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is applied directly or indirectly in
Other related technical areas are included within the scope of the present invention.
Claims (8)
1. a kind of switching power source control circuit, which is characterized in that the switching power source control circuit includes for outputting reference electricity
The benchmark generation sub-circuit of pressure, the sampling filter electricity sampled for the output voltage to the switching power source control circuit
Road and the comparator sub-circuit for being connected to the benchmark generation sub-circuit and the sampling filter sub-circuit, the comparator electricity
Road receives the reference voltage respectively and sampled voltage is compared, and exports comparison result；
The switching power source control circuit further includes drive sub-circuits and partial pressure sub-circuit, and the drive sub-circuits are connected to described
Comparator sub-circuit receives the comparison result of the comparator sub-circuit, and for the sampling filter sub-circuit to be connected；It is described
It divides sub-circuit and the sampling filter sub-circuit is connected to by buffer, receive after the sampled voltage is divided and be input to
The comparator sub-circuit.
2. switching power source control circuit according to claim 1, which is characterized in that the benchmark generation sub-circuit output
The reference voltage includes the first reference voltage and the second reference voltage, and the value of first reference voltage is more than or less than described
The value of second reference voltage.
3. switching power source control circuit according to claim 2, which is characterized in that the comparator sub-circuit passes through selection
It switchs and is connected to the benchmark generation sub-circuit, described in comparison result selection connection of the selection switch by the comparator
One in first reference voltage and second reference voltage.
4. switching power source control circuit according to claim 2, which is characterized in that the switching power source control circuit also wraps
Error amplifier sub-circuit is included, the first input end of the error amplifier sub-circuit receives the output voltage, the error
Second input terminal of amplifier sub-circuit is connected to the benchmark generation sub-circuit, the output end of the error amplifier sub-circuit
It is connected to the benchmark generation sub-circuit.
5. switching power source control circuit according to claim 4, which is characterized in that the benchmark generation sub-circuit also exports
Third reference voltage, the value of the third reference voltage are the flat of the value of first reference voltage and second reference voltage
Mean value；The second output terminal of the error amplifier sub-circuit receives the third reference voltage.
6. switching power source control circuit according to claim 1, which is characterized in that the sampling filter sub-circuit includes the
One resistance, the first capacitor for being connected to the first resistor and the inductance for being parallel to the first resistor and first capacitor, it is described
Sampled voltage output end is also connected between first resistor and the first capacitor, the sampled voltage output end is connected to described
The input terminal of buffer, the output end of the buffer are connected to the partial pressure sub-circuit.
7. switching power source control circuit according to claim 6, which is characterized in that the sampling filter sub-circuit is also connected with
There is the second capacitor, one end of second capacitor is connected to the voltage output of the inductance and the switching power source control circuit
End, other end ground connection.
8. switching power source control circuit according to claim 7, which is characterized in that the drive sub-circuits pass through PMOS tube
The sampling filter sub-circuit is connected to NMOS tube, and the grid of the PMOS tube and the NMOS tube is all connected to the driving
Circuit；The source electrode of the PMOS tube is connected to power supply, and drain electrode is connected to the drain electrode of the NMOS tube, one end of first resistor and electricity
One end of sense；The source electrode of the NMOS tube is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910719461.7A CN110429816A (en) | 2019-08-06 | 2019-08-06 | A kind of switching power source control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910719461.7A CN110429816A (en) | 2019-08-06 | 2019-08-06 | A kind of switching power source control circuit |
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| CN110429816A true CN110429816A (en) | 2019-11-08 |
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| CN201910719461.7A Pending CN110429816A (en) | 2019-08-06 | 2019-08-06 | A kind of switching power source control circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751483A (en) * | 2020-12-29 | 2021-05-04 | 成都锐成芯微科技股份有限公司 | Constant voltage control circuit |
| CN113872444A (en) * | 2021-09-08 | 2021-12-31 | 东莞市长工微电子有限公司 | Control circuit of direct current transformer and direct current transformer |
| CN115424571A (en) * | 2022-09-20 | 2022-12-02 | 惠科股份有限公司 | Power supply circuit, display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7576527B1 (en) * | 2006-07-20 | 2009-08-18 | Marvell International Ltd. | Low power DC-DC converter with improved load regulation |
| US20120229105A1 (en) * | 2011-03-10 | 2012-09-13 | Broadcom Corporation | Hysteretic Switching Regulator With Reduced Switching Frequency Variation |
-
2019
- 2019-08-06 CN CN201910719461.7A patent/CN110429816A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7576527B1 (en) * | 2006-07-20 | 2009-08-18 | Marvell International Ltd. | Low power DC-DC converter with improved load regulation |
| US20120229105A1 (en) * | 2011-03-10 | 2012-09-13 | Broadcom Corporation | Hysteretic Switching Regulator With Reduced Switching Frequency Variation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751483A (en) * | 2020-12-29 | 2021-05-04 | 成都锐成芯微科技股份有限公司 | Constant voltage control circuit |
| CN113872444A (en) * | 2021-09-08 | 2021-12-31 | 东莞市长工微电子有限公司 | Control circuit of direct current transformer and direct current transformer |
| CN115424571A (en) * | 2022-09-20 | 2022-12-02 | 惠科股份有限公司 | Power supply circuit, display panel and display device |
| CN115424571B (en) * | 2022-09-20 | 2023-09-19 | 惠科股份有限公司 | Power supply circuit, display panel and display device |
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