CN106655749A - Power supply control circuit and switch power supply applying same - Google Patents
Power supply control circuit and switch power supply applying same Download PDFInfo
- Publication number
- CN106655749A CN106655749A CN201611022240.7A CN201611022240A CN106655749A CN 106655749 A CN106655749 A CN 106655749A CN 201611022240 A CN201611022240 A CN 201611022240A CN 106655749 A CN106655749 A CN 106655749A
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- Prior art keywords
- circuit
- current
- control circuit
- power supply
- current source
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a power supply control circuit and a switch power supply applying the same. Through controlling work currents of a compensation circuit at an initial work state, a compensation capacitor is firstly enabled to be rapidly charged, conduction time of a power switch tube can be increased, the capability of output voltages in charging a charging capacitor is enhanced, and after some time after starting, charge and discharge currents of the compensation capacitor are switched to a normal working state. According to the invention, through controlling the charging currents of the compensation capacitor, the capability of the output voltages in charging the charging capacitor is enhanced, the loss of a driving circuit is reduced, at the same time, reliance on the compensation capacitor during the starting can also be reduced through controlling the size of the charge and discharge currents, sensitivity to switching opportunities is eliminated, and such risks of lamp scintillation caused by overshoot and the like can be effectively avoided.
Description
Technical field
The present invention relates to field of switch power, more particularly, it relates to a kind of power control circuit and the switch using it
Power supply.
Background technology
The theory diagram of traditional LED drive circuit is as shown in figure 1, external communication input voltage is after rectifier bridge rectification
The DC voltage VIN pulsed is obtained, then DC voltage VIN produces output voltage VO supply after on-off circuit conversion process
Load, control circuit receives the sampled signal of DC voltage VIN, output voltage VO and on-off circuit output, to produce control
Signal is to the on off state in controlling switch circuit, so that output voltage signal expected from on-off circuit output.
As shown in Fig. 2 control circuit generally comprises 5 submodules：Supply module, sample circuit, compensation circuit, conducting are closed
Disconnected control circuit and drive circuit.Supply module receives DC voltage VIN and output voltage VO to produce supply voltage as other
All submodules are powered；The sampled signal of sample circuit reception on-off circuit transmission obtains after treatment sampled signal and is transferred to
Compensation circuit；Compensation circuit is compensated signal through compensation deals, and thermal compensation signal is transferred to open to switch off control circuit and obtains
The control signal of on-off circuit, control signal switch again in drive circuit final output drive signal controlling switch circuit
State is adjusting output voltage VO.In general, the input structure of supply module is as shown in figure 3, DC voltage VIN is by starting
Resistance R0 to electric capacity C02, output voltage VO is by current-limiting resistance R1 and sustained diode 1 to electric capacity C02, the two ends of electric capacity C02
Voltage VCC is supply voltage.DC voltage VIN is charged by starting resistance R0 to electric capacity C02, and for control circuit startup electricity is provided
Stream, after chip is started working, output voltage VO starts to be charged to electric capacity C02 by current-limiting resistance and fly-wheel diode, electric capacity
The supply voltage of C02 is powered by power supply circuits for whole control circuit, keeps system normal operation.
However, in actual work, in order to filter working frequency ripple wave, in the compensating electric capacity and on-off circuit in compensation circuit
Output capacitance choose often very big, cause the output voltage VO after drive circuit starts to rise very slow, and each switch periods
ON time is very short, therefore the output voltage VO in supply module is very weak to effective charging ability of electric capacity C02, from drive circuit
Start working to supply voltage VCC to reach and need longer time for electric equilibrium, often repeatedly to restart just can complete and started
Journey, so that starting time is very long, or even can not be completed start-up course under the occasions such as continuous switching on and shutting down.
The content of the invention
In view of this, the present invention proposes power control circuit and the Switching Power Supply using it, by control and compensation circuit
Operating current in initial working condition, can strengthen charging ability of the output voltage to charging capacitor, open so as to be rapidly completed
Move the supply voltage demand in normal work.
A kind of power control circuit of the foundation present invention, including compensation circuit, the compensation circuit includes charging circuit, puts
Circuit and compensating electric capacity, the charging circuit is charged by pull-up current to the compensating electric capacity, and the discharge circuit passes through
Pull-down current discharges to the compensating electric capacity；
Wherein, in the startup stage of the power supply, the pull-up current and pull-down current are increased respectively.
Further, the charging circuit includes the first current source and the second current source, and the discharge circuit includes the 3rd
Current source and the 4th current source,
The first end of the first end of first current source and second current source is connected to a little and commonly connected
End is connected to voltage source, and the second end of the first current source is connected to the compensating electric capacity, second electric current by first switch
Second end in source is connected to the compensating electric capacity；
The first end of the 3rd current source is connected to the compensating electric capacity by second switch, the 4th current source
First end is connected to the compensating electric capacity, and second end of the 3rd current source and the second end of the 4th current source are connected to a bit
And public connecting end is connected to ground terminal.
Preferably, the size of first current source is (K1-1) times of second current source；3rd current source
Size be the 4th current source (K2-1) times；K2 and K1 are the positive number more than 1, and the value of K2 is more than or equal to K1's
Value.
Preferably, in the startup stage of the power supply, the first switch and second switch conducting are controlled；
After the first time period of power initiation work, control the first switch and the second switch disconnects.
Further, the control circuit also includes supply module, output electricity of the supply module according to the power supply
Pressure signal produces supply voltage and uses for the control circuit；
In the startup stage of the power supply, the pull-up current is more than the pull-down current, compensating electric capacity in the power supply
Voltage rises, the supply voltage rapid increase of the supply module output.
Further, the control circuit also includes sample circuit, and the sample circuit receives the output electricity of the power supply
Pressure signal or output current signal, are transferred to producing the sampled current signals for characterizing output voltage signal or output current signal
The compensation circuit, current signal of the sampled current signals as the 4th current source of the compensation circuit.
Further, the control circuit also switches off control circuit and drive circuit including conducting,
The conducting switches off control circuit and receives the thermal compensation signal of the compensation circuit output, to control the power supply accordingly
The ON time of middle power switch pipe；
The drive circuit receives the output signal for turning on and switching off control circuit, described to produce drive signal control
The switch motion of power switch pipe.
Preferably, described power control circuit is applied to the occasion of continuous switching on and shutting down.
A kind of Switching Power Supply of the foundation present invention, including power stage circuit and above-mentioned power control circuit,
The power control circuit receives the DC voltage of rectifier bridge output and the output voltage signal of power supply or output electricity
Stream signal, to produce the switch motion that switch controlling signal controls power switch pipe in the power stage circuit.
Preferably, the Switching Power Supply is LED drive circuit.
In sum, according to power control circuit of the present invention and the Switching Power Supply using it, existed by control and compensation circuit
Operating current during initial working condition so that compensating electric capacity energy quick charge, so as to lengthen the ON time of power switch pipe,
Charging ability of the output voltage to charging capacitor can be strengthened, afterwards, after a period of time to be launched, by the discharge and recharge electricity of compensating electric capacity
Stream is switched to normal operating conditions.
The present invention can pass through the charging current of control and compensation electric capacity, not only enhance charging of the output voltage to charging capacitor
Ability, reduces the loss of drive circuit, while can also be reduced by controlling the size of charging and discharging currents during startup to mending
The dependence of electric capacity is repaid, and it is insensitive to switching time, can effectively evade lamp flicker equivalent risk caused by overshoot, while can
To control charging and discharging currents scale by programming, to meet the startup demand under different application.
Description of the drawings
Fig. 1 is the theory diagram of traditional LED drive circuit；
Fig. 2 is the module map of control circuit in Fig. 1；
Fig. 3 is the input structure figure of supply module in Fig. 2；
Fig. 4 is the circuit diagram of the compensation circuit according to the present invention.
Specific embodiment
Some currently preferred embodiments of the present invention is described in detail below with reference to accompanying drawing, but the invention is not restricted to this.
In embodiments of the present invention, the Switching Power Supply is by taking LED drive circuit as an example, but the control circuit application of the present invention
Not limited to this, the control circuit of the LED drive circuit is as shown in Fig. 2 supply module, sample circuit in control circuit, lead
It is logical to switch off control circuit consistent with Fig. 2 with the 26S Proteasome Structure and Function of drive circuit, will not be described here.Except that, due to
There is a problem of that startup of the prior art is slow, compensation circuit is improved in the present invention.
The circuit diagram of the compensation circuit according to the present invention is shown with reference to Fig. 4, the compensation circuit includes charging circuit, puts
Circuit and compensating electric capacity Cc, the charging circuit includes the first current source I1 and the second current source I2, the discharge circuit bag
Include the first of the 3rd current source I3 and the 4th current source I4, the first end of the first current source I1 and the second current source I2
End is connected to a little and public connecting end is connected to voltage source, and second end of the first current source I1 is connected by first switch S1
To compensating electric capacity Cc, second end of the second current source I2 is connected to compensating electric capacity Cc；Wherein, described first is electric
The size in stream source is (K1-1) times of second current source, and here, the size for remembering the second current source is Iref, then the first electric current
The size in source is (K1-1) Iref；The first end of the 3rd current source I3 is connected to the compensating electric capacity by second switch S2
The first end of Cc, the 4th current source I4 is connected to compensating electric capacity Cc, second end of the 3rd current source I3 and
Second end of four current source I4 is connected to a little and public connecting end is connected to ground terminal, wherein, the 3rd current source it is big
Little (K2-1) for the 4th current source times, here, the size for remembering the 4th current source is Isen, then, and the 3rd current source it is big
It is little for (K2-1) Iref.Also, K1, K2 are the positive number more than 1, and value of the value of K2 more than or equal to K1.
Wherein, the on off state of first switch S1 and second switch S2 is：In the startup stage of the power supply, control is described
First switch S1 and second switch S2 are turned on；(first time period can be according to need for the first time period worked in the power initiation
Arrange, be traditionally arranged to be 2 to 5 power frequency periods) after, control first switch S1 and second switch S2 disconnects.First opens
Close the switching signal control that S1 and second switch S2 for example can pass through in Switching Power Supply power stage circuit, but not limited to this.
The electric current that can be seen that the first current source I1 and the second current source I2 by above-mentioned circuit structure is the compensation
The pull-up current (i.e. charging current) of electric capacity Cc, the electric current of the 3rd current source I3 and the 4th current source I4 is compensating electric capacity Cc
Pull-down current (i.e. discharge current).
It should be noted that in embodiments of the present invention, the current signal Isen of shown 4th current source is described in Fig. 2
The sampled current signals of sample circuit transmission, the sample circuit receives the output voltage signal or output current letter of the power supply
Number, the compensation circuit is transferred to produce the sampled current signals for characterizing output voltage signal or output current signal, it is described
Current signal of the sampled current signals as the 4th current source of the compensation circuit.
The course of work of the embodiment of the present invention is illustrated according to above-mentioned circuit structure：After Switching Power Supply is started working, the
One switch S1 and second switch S2 conductings, now the pull-up current of compensating electric capacity Cc is k1*Iref, and pull-down current is k2*Isen,
When just starting to start, by arranging the value of K1, K2 to increase the pull-up current and pull-down current respectively, so that compensating electric capacity
Cc obtains quick charge；And because the ON time of power switch pipe is short, sample rate current Isen can be less than pull-up current k1*
Iref, larger k1 values are chosen here can quickly increase compensating electric capacity both end voltage, quick with compensating electric capacity voltage
Increase, the ON time that can cause power switch pipe in Switching Power Supply is lengthened, and has so greatly reinforced output voltage VO to filling
The charging ability of electric capacity VCC, so as to the supply voltage of supply module output obtains rapid increase, while sample rate current
Isen also can increase therewith, reduce the pull-up speed of compensating electric capacity, after drive circuit works first time period, first be opened
S1 and second switch S2 shut-offs are closed, the pull-up current and pull-down current of compensating electric capacity are switched to normal operating conditions, and finally reach
To stable state.Described first time period is a reasonable time, can be set as the case may be, typically may be configured as 1-5 work
The frequency cycle.
In the present embodiment, in steady-working state, the meansigma methodss of electric current Iref and sample rate current Isen are equal.By upper
The process stated can be seen that the current control scheme by the embodiment of the present invention, can be very good realization defeated in start-up course
Go out function of the voltage to charging capacitor quick charge, so as to rely on the size of compensating electric capacity when reducing starting.
Additionally, in order to prevent in charging process, the impact for causing soon very much to overshoot that compensating electric capacity is charged, in design,
The value of the value more than K1 of K2 is set, overshoot phenomenon can be effectively prevented, also, normal current shape is switched to starting working condition
State is insensitive, while and the foundation of compensating electric capacity steady state voltage can be accelerated, output voltage VO is greatly reinforced to charging capacitor
Charging ability.
In theory, the value of k1 and the value of k2 are bigger, and the foundation of compensating electric capacity steady state voltage is faster, start big to charging capacitor
Little dependence is less, but actually user can be by programming come to k1 and k2 assignment, to meet the startup under different application
Demand.
It should be noted that the power control circuit described in the embodiment of the present invention is applied to the occasion of continuous switch, with
Complete the quick charge in start-up course and reach steady statue.
Above so that Switching Power Supply is as LED drive circuit as an example, but the control circuit of power supply of the present invention can also be applied to hand over
In the suitable Switching Power Supply such as stream-DC voltage converting circuit, DC-DC voltage change-over circuit.Although, the enforcement of the present invention
Example is exchange input, but the scheme of the present invention is equally applicable to direct current input, and teaching of the invention, this point can be this
Field those of ordinary skill known.
Carry out in detail to the power control circuit according to the preferred embodiments of the present invention and using its Switching Power Supply above
Description, but the circuit and beneficial effect with regard to the patent to the greatest extent should not be considered as being limited only to described above, disclosed reality
Applying example and accompanying drawing can be better understood from the present invention, therefore, embodiment and Figure of description content disclosed above is in order to more
The good understanding present invention, present invention protection is not limited to limit the scope of the present disclosure, and those of ordinary skill in the art are to the present invention
Replacement, the modification of embodiment is within protection scope of the present invention.
Claims (10)
1. a kind of power control circuit, including compensation circuit, it is characterised in that
The compensation circuit includes charging circuit, discharge circuit and compensating electric capacity, and the charging circuit is by pull-up current to institute
Compensating electric capacity charging is stated, the discharge circuit is discharged by pull-down current to the compensating electric capacity；
Wherein, in the startup stage of the power supply, the pull-up current and pull-down current are increased respectively.
2. power control circuit according to claim 1, it is characterised in that the charging circuit include the first current source and
Second current source, the discharge circuit includes the 3rd current source and the 4th current source,
The first end of the first end of first current source and second current source is connected to a little and public connecting end connects
Voltage source is connected to, the second end of the first current source is connected to the compensating electric capacity by first switch, second current source
Second end is connected to the compensating electric capacity；
The first end of the 3rd current source is connected to the compensating electric capacity by second switch, and the first of the 4th current source
End is connected to the compensating electric capacity, second end of the 3rd current source and the second end of the 4th current source be connected to a little and
Public connecting end is connected to ground terminal.
3. power control circuit according to claim 2, it is characterised in that the size of first current source is described the
(K1-1) of two current sources times；The size of the 3rd current source is (K2-1) times of the 4th current source；K2 and K1 are
Positive number more than 1, and value of the value of K2 more than or equal to K1.
4. power control circuit according to claim 2, it is characterised in that in the startup stage of the power supply, controls institute
State first switch and second switch conducting；
After the first time period of power initiation work, control the first switch and the second switch disconnects.
5. power control circuit according to claim 1, it is characterised in that the control circuit also includes supply module,
The supply module produces supply voltage and uses for the control circuit according to the output voltage signal of the power supply；
In the startup stage of the power supply, the pull-up current is more than the pull-down current, compensating electric capacity voltage in the power supply
Rise, the supply voltage rapid increase of the supply module output.
6. power control circuit according to claim 2, it is characterised in that the control circuit also includes sample circuit,
The sample circuit receives the output voltage signal or output current signal of the power supply, with produce characterize output voltage signal or
The sampled current signals of output current signal are transferred to the compensation circuit, and the sampled current signals are used as the compensation circuit
The 4th current source current signal.
7. power control circuit according to claim 1, it is characterised in that the control circuit also includes conducting shut-off control
Circuit processed and drive circuit,
The conducting switches off control circuit and receives the thermal compensation signal of compensation circuit output, to control the power supply accordingly in work(
The ON time of rate switching tube；
The drive circuit receives the output signal for turning on and switching off control circuit, and to produce drive signal the power is controlled
The switch motion of switching tube.
8. the power control circuit according to claim 1-7 any one, it is characterised in that described power control circuit
Suitable for the occasion of continuous switching on and shutting down.
9. a kind of Switching Power Supply, it is characterised in that including the power supply described in power stage circuit and any one of claim 1-8
Circuit,
The power control circuit receives the output voltage signal or output current letter of the DC voltage of rectifier bridge output and power supply
Number, to produce the switch motion that switch controlling signal controls power switch pipe in the power stage circuit.
10. Switching Power Supply according to claim 9, it is characterised in that the Switching Power Supply is LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611022240.7A CN106655749B (en) | 2016-11-16 | 2016-11-16 | Power supply control circuit and switching power supply using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611022240.7A CN106655749B (en) | 2016-11-16 | 2016-11-16 | Power supply control circuit and switching power supply using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106655749A true CN106655749A (en) | 2017-05-10 |
| CN106655749B CN106655749B (en) | 2023-09-22 |
Family
ID=58808363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611022240.7A Active CN106655749B (en) | 2016-11-16 | 2016-11-16 | Power supply control circuit and switching power supply using same |
Country Status (1)
| Country | Link |
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| CN (1) | CN106655749B (en) |
Cited By (3)
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| CN107947560A (en) * | 2017-12-15 | 2018-04-20 | 杰华特微电子（杭州）有限公司 | On-off circuit control circuit and on-off circuit |
| CN110545605A (en) * | 2018-10-17 | 2019-12-06 | 矽力杰半导体技术(杭州)有限公司 | Integrated circuit, dimmable LED drive circuit and drive method thereof |
| TWI754947B (en) * | 2020-05-29 | 2022-02-11 | 大陸商北京集創北方科技股份有限公司 | DC-DC conversion circuit and information processing device |
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| Publication number | Publication date |
|---|---|
| CN106655749B (en) | 2023-09-22 |
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