CN110165870A - A kind of constant power control circuit - Google Patents
A kind of constant power control circuit Download PDFInfo
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- CN110165870A CN110165870A CN201810151400.0A CN201810151400A CN110165870A CN 110165870 A CN110165870 A CN 110165870A CN 201810151400 A CN201810151400 A CN 201810151400A CN 110165870 A CN110165870 A CN 110165870A
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- power control
- signal
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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
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention proposes a kind of constant power control circuit, comprising: the first gain unit, the second gain unit and voltage clamping unit；Wherein, the first gain unit is to execute enhanced processing to voltage sample signal based on the first gain, and the voltage sample signal and a reference voltage are then executed a subtraction process；Second gain unit is then to execute enhanced processing based on output signal of second gain to first gain unit；The voltage clamping unit executes voltage clamping processing to the output signal to the second gain unit, and then exports a power control reference signal to current error amplifier.In this way, allowing controller by way of controlling the ON/OFF period of power switch SW, the output electric current of power adapter is enabled to adjust (downgrading) with actual output voltage, reach overload current protection and determines the function of power output control.
Description
Technical field
The present invention relates to a kind of electronic circuit fields, are applied to power adapter, power supply unit more particularly to one kind
Or the constant power control circuit within charger (charger).
Background technique
With the development and progress of electronics technology, miscellaneous electronic equipment and product are widely used in people's
Among daily life, and conventionally used linear power supply power supply unit (linear power supply) provide stable voltage/
Electric current electron equipment.However, traditional linear power supply power supply unit has the shortcomings that bulky, power supply conversion efficiency is low etc., because
This Dutchman Luo Nai (Neti R.M.Rao) discloses switched-mode power supply confession first among U.S. Patent number US4,253,137
Answer device technology (Switch Mode Power Supply, SMPS).
Fig. 1 shows a kind of circuit block diagram of existing power adapter.As shown in Figure 1, existing power adapter 1 '
It include: a rectification unit 11 ', the PFC unit 12 ' (power factor correction unit), a power switch list for coupling voltage source VS '
First 13 ', one transformer unit 14 ', an output rectification unit 15 ', an output filter unit OF ', an error calculation unit 16 ',
One photo-coupler OC ' and a control unit 17 '；Wherein, the error calculation unit 16 ' generally comprises a voltage error and puts
Big device 161 ' and a current error amplifier 162 '.
The Electronics Engineer for being familiar with power converter design exploitation should be understood that voltage error amplifier 161 ' and electric current miss
Poor amplifier 162 ' is respectively by a voltage sampling unit VSU ' and a current sampling unit CSU ' from transformer unit 14 '
Output end (that is, secondary side) obtains a voltage sample signal and a current sample signal, and is further advanced by optocoupler feedback device
OC ' output voltage/electric current error signal is to control unit 17 ', so that described control unit 17 ' can accordingly export a pulsewidth
Modulation signal reaches the output signal of stabilized power supply converter 1 ' to control ON/OFF period of power switch unit 13 ' whereby
Effect.It is worth noting that, only to notify control unit 17 ' that accordingly the voltage of output pulse width modulation signal or electric current miss
Difference signal can be exported by OR logic gate 163 '.
Existing power adapter 1 ' being capable of steadily output voltage signal or electricity due to equipped with error calculation unit 16 '
Flow signal.Unfortunately, Zhao Yin only can solely regulate and control electricity with described control unit 17 ' in the error calculation unit 16 '
The output voltage or electric current of source converter 1 ', therefore the error calculation unit 16 ' and described control unit 17 ' and be unable to control
Power output is determined in the maintenance of power adapter 1 '.
Electricity only can be solely maintained in view of error calculation unit 16 ' used in the prior art and control unit 17 '
The constant voltage of source power supply unit 1 ' exports or constant current exports and can not regulate and control the maintenance of power supply unit 1 ' and determine power output, this
The inventor of case is strongly studied invention, and is researched and developed finally and completed a kind of constant power control circuit of the invention.
Summary of the invention
Only the constant voltage of power supply unit can solely be maintained to export different from feedback unit used in the prior art
Or constant current output, the main purpose of the present invention is to provide a kind of constant power control circuits comprising: one first gain list
Member, one second gain unit and a voltage clamping unit；Wherein, the first gain unit is to be based on the first gain to voltage sample
Signal executes enhanced processing, and the voltage sample signal and a reference voltage are then executed a subtraction process.Second gain
Unit is then to execute enhanced processing based on output signal of second gain to first gain unit.Also, the voltage
Strangulation unit executes voltage clamping processing to the output signal to the second gain unit, and then exports power control ginseng
Signal is examined to current error amplifier.In this way, current error amplifier will be based on a current sample signal and the power control
Reference signal processed and export a current error signal to controller, allow the controller to pass through control power switch SW's
The mode in ON/OFF period enables the output electric current of power adapter adjust (downgrading) with actual output voltage, reaches overload current
Protection and the function of determining power output control.
In order to reach the main purpose of aforementioned present invention, the inventor of this case provides a reality of the constant power control circuit
Example is applied, is applied in a feedback circuit, wherein the feedback circuit includes at least a current error amplifier, a voltage error is put
Big device and a photo-coupler；Also, the constant power control circuit includes:
One first gain unit is electrically connected to a voltage sample signal and a reference voltage, to increase based on one first
Benefit executes one first enhanced processing to the voltage sample signal and the reference voltage, and will then complete described first and put
The voltage sample signal and the reference voltage handled greatly executes a subtraction process；
One second gain unit is electrically connected to first gain unit, to receive first gain unit
One first output signal, and one second enhanced processing is executed to first output signal based on one second gain；And
One voltage clamping unit is electrically connected to second gain unit, to receive second gain unit
One second output signal, and voltage clamping processing is executed to second output signal, then export a power control reference
Signal is to the current error amplifier.
Also, in order to reach the main purpose of aforementioned present invention, the inventor of this case provides the constant power control circuit
Another embodiment, be applied to a feedback circuit in, wherein the feedback circuit include at least a current error amplifier and one
Voltage error amplifier；Also, the constant power control circuit includes:
One gain unit is electrically connected to a voltage sample signal and a reference voltage, to be based on a gain to described
Voltage sample signal executes an enhanced processing, and then by the voltage sample signal for completing the enhanced processing and the ginseng
It examines voltage and executes a subtraction process；And
One voltage clamping unit, is electrically connected to the gain unit, to receive an output news of the gain unit
Number, and voltage clamping processing is executed to the output signal, it then exports a power control reference signal to the electric current and misses
Poor amplifier.
Detailed description of the invention
Fig. 1 shows a kind of circuit block diagram of the power adapter provided in the prior art；
Fig. 2 shows a kind of circuit block diagrams of a feedback circuit 2 of constant power control circuit of the invention；
Fig. 3 shows the circuit framework figure of the first embodiment of constant power control circuit of the invention；
Fig. 4 shows the functional block diagram of the first embodiment of constant power control circuit of the invention；
Fig. 5 shows curve graph of the output electric current relative to output voltage；
Fig. 6 shows the circuit framework figure of the second embodiment of constant power control circuit of the invention；And
Fig. 7 shows the functional block diagram of the second embodiment of constant power control circuit of the invention.
Symbol description:
<present invention>
4 constant power control circuit, 2 feedback circuit
The load of 1 power conversion module 3
VSU voltage sampling unit CSU current sampling unit
21 current error amplifier, 22 voltage error amplifier
23 controller of OC photo-coupler
41 first gain unit, 42 second gain unit
43 voltage clamping unit Vsen voltage sample signals
VREF reference voltage 41a function block
42a function block 43a function block
13 first negative input end, 12 first positive input terminal
14 first the first operational amplifiers of output end OP1
R366 first resistor R368 second resistance
The 4th resistance of R367 3rd resistor R369
GND ground terminal C362 third capacitor
10 second positive input terminal of the 4th capacitor of C363
9 second negative input end, 8 second output terminal
The 5th resistance of OP2 second operational amplifier R363
The 6th resistance of C361 first capacitor R362
The 7th the second capacitor of resistance C364 of R365
The tri- controllable voltage-stablizer in end of D1 first diode SR
D2 the second diode A anode tap
The reference end C cathode terminal R
R361 output resistance VCC circuit voltage
41 ' gain unit VX reference voltages
41b function block 43b function block
<existing>
1 ' power adapter Vs ' voltage source
11 ' rectification unit, 12 ' PFC unit
13 ' power switch unit, 14 ' transformer unit
15 ' output rectification unit OF ' export filter unit
16 ' error calculation unit OC ' photo-couplers
17 ' control unit, 161 ' voltage error amplifier
162 ' current error amplifier VSU ' voltage sampling units
163 ' OR logic gate of CSU ' current sampling unit
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Specific embodiment, structure, feature and its effect applied according to the present invention is described in detail such as in attached drawing and preferred embodiment
Afterwards.In the following description, what different " embodiment " or " embodiment " referred to is not necessarily the same embodiment.In addition, one or more
Special characteristic, structure or feature in a embodiment can be combined by any suitable form.
In order to more clearly describe a kind of feedback circuit that can change response with dim signal proposed by the invention,
Below in conjunction with schema, presently preferred embodiments of the present invention is elaborated.
First embodiment
Referring to Fig. 2, display has a kind of circuit block diagram of a feedback circuit of constant power control circuit of the invention.
As shown in Fig. 2, constant power control circuit 4 of the invention is applied in feedback circuit 2, wherein the feedback circuit 2 is connected to one
Between the output end of power conversion module 1 and its internal power switch SW, and the output end of the power conversion module 1 connects
It is connected to a load 3.The feedback circuit 2 includes: a voltage sampling unit VSU, a current sampling unit CSU, a current error
Amplifier 21, a voltage error amplifier 22, a photo-coupler OC and a controller 23.
Unceasingly referring to Fig.2, and please refer to Fig. 3 and Fig. 4.Wherein, Fig. 3 shows constant power control circuit of the invention
First embodiment circuit framework figure, and Fig. 4 shows the function side of the first embodiment of constant power control circuit of the invention
Block figure.By Fig. 2 and Fig. 3 it is found that constant power control circuit 4 of the invention specifically includes that one first gain unit 41, one second increases
Beneficial unit 42 and a voltage clamping unit 43；Wherein, first gain unit 41 is electrically connected to a voltage sample signal
A Vsen and reference voltage VREF.In this, it is necessary to supplementary explanation, since voltage sampling unit VSU is electrically connected at voltage
Between error amplifier 22 and the output end of power conversion module 1；Also, described in the voltage sampling unit VSU is provided simultaneously
Voltage sample signal Vsen gives first gain unit 41.As shown in the function block 41a of Fig. 4, voltage sample news are being received
After number Vsen and reference voltage VREF, first gain unit 41 will be based on one first gain A to voltage sample signal
The Vsen and reference voltage VREF executes one first enhanced processing, and will then complete described in first enhanced processing
The voltage sample signal Vsen and reference voltage VREF executes a calculation processing.Calculation processing of the invention can be at subtraction
Reason, and subtraction process is to handle the difference of the voltage sample signal Vsen and the reference voltage VREF.
On the other hand, the second gain unit 42 is electrically connected to first gain unit 41, to receive described first
One first output signal of gain unit 41.It is described after receiving the first output signal as shown in the function block 42a of Fig. 4
Second gain unit 42 will and execute one second enhanced processing to first output signal based on one second gain B.Furthermore
Voltage clamping unit 43 is electrically connected to second gain unit 42, to receive the one second of second gain unit 42
Output signal.As shown in the function block 43a of Fig. 4, after receiving the second output signal, the voltage clamping unit 43 will
The processing of one voltage clamping is executed to second output signal, then exports a power control reference signal CREF to the electric current
Error amplifier 21.
Unceasingly refering to Fig. 2 and Fig. 3.Current sampling unit CSU is electrically in current error amplifier 21 and power supply modulus of conversion
Between the output end of block 1, to provide a current sample signal Csen to the current error amplifier 21, the current error
Amplifier 21 has a positive input terminal, and the power control reference CREF is linked to the positive input terminal.In this way, current error is put
Big device 21 will generate a current error based on the current sample signal Csen and the power control reference signal CREF
Signal, and the current error signal is sent to by the controller 23 by the photo-coupler OC.Finally, the controller
23 can export the power switch SW inside PWM control signal to the power conversion module 1, by adjusting the function
The mode in the ON/OFF period of rate switch SW enables the output electric current of power conversion module 1 (adjust with actual output voltage adjustment
Drop), reach the function of overload current protection.Further, and simultaneously reach the function of determining power output control.
Curve graph of Fig. 5 display output electric current relative to output voltage.Observing Fig. 5 can find, general power supply unit
Or the output voltage of power adapter, when be enhanced, output electric current also can lead to power supply unit or power supply with raising
The output power of converter also and then increases, such as: 1200W is increased to by 1140W, and is increased to 1400W from 1200W.Therefore,
In order to enable the output electric current of power conversion module 1 with actual output voltage adjust and (downgrade) with reach overload current protection and
Determine the function of power output control, it is necessary to suitably the first gain A of the first gain unit of planning and designing 41 and the second gain list
Second gain B of member 42.It please refer to following mathematical expression (1), (2) and (3).
In above-mentioned mathematical expression, Io1 and Io2 is output current value and Vo1 and Vo2 is output voltage values.Also, Vclamp table
It is shown as a clamp voltage point provided by the voltage clamping unit 43.By mathematical expression (1), (2) with (3) it is known that adjustment
First gain A can make (VREF-A × Vo1): (VREF-A × Vo2)=Io1:Io2；Meanwhile adjust the second gain B can be with
So that (VREF-A × Vo2) × B=Vclamp (also that is, clamp voltage point).Therefore, in order to enable the first of the first gain unit 41
Second gain B of gain A and the second gain unit 42 be it is adjustable, inventor be directed to the first gain unit 41 and second
The internal circuit framework of gain unit 42 is made that special design.
In above-mentioned mathematical expression, Io1 and Io2 is output current value and Vo1 and Vo2 is output voltage values.Also, Vclamp table
It is shown as a clamp voltage point provided by the voltage clamping unit 43.By mathematical expression (1), (2) with (3) it is known that adjustment
First gain A can make (VREF-A × Vo1): (VREF-A × Vo2)=Io1:Io2；Meanwhile adjust the second gain B can be with
So that (VREF-A × Vo2) × B=Vclamp (also that is, clamp voltage point).Therefore, in order to enable the first of the first gain unit 41
Second gain B of gain A and the second gain unit 42 be it is adjustable, inventor be directed to the first gain unit 41 and second
The internal circuit framework of gain unit 42 is made that special design.
As shown in figure 3, first gain unit 41 includes: with one first negative input end 13, one first positive input terminal
12, with one first operational amplifier OP1 of one first output end 14, a first resistor R366, a second resistance R368, a third
Resistance R367 and one the 4th resistance R369；Wherein, when executing the calculation processing, the voltage sample signal Vsen electricity
Property is connected to first negative input end 13；And the reference voltage VREF is electrically connected to first positive input terminal 12,
The both ends of the first resistor R366 are electrically connected between first negative input end 13 and first output end 14,
And the both ends of the second resistance R368 are electrically connected in the voltage sample signal Vsen and first negative input end
Between 13.On the other hand, the both ends of the 3rd resistor R367 are electrically connected in the reference voltage VREF and described the
Between one positive input terminal 12, and the both ends of the 4th resistance R369 are electrically connected in a ground terminal GND and described first just
Between input terminal 12.It must be supplemented with explanation, the first resistor R366 is in parallel with a third capacitor C362, and the third
Resistance R367 is in parallel with one the 4th capacitor C363.In this way, completed by the internal circuit framework to the first gain unit 41
It is specifically designed, represented by the first gain A of the first gain unit 41 is just adjustable, and it is by lower mathematical expression (4).
Briefly, the first ratio between first resistor R366 and second resistance R368 is the first gain A；Therefore,
Resistance value by changing first resistor R366 and/or second resistance R368 can reach the regulation to the first gain A.Meanwhile
The second ratio between 3rd resistor R367 and the 4th resistance R369 is also the first gain A；Therefore, by changing 3rd resistor
The resistance value of R367 and/or the 4th resistance R369 can also reach the regulation to the first gain A.On the other hand, described in Fig. 3 is shown
Second gain unit 42 includes: one with one second positive input terminal 10, one second negative input end 9 and a second output terminal 8
Two operational amplifier OP2, one the 5th resistance R363, a first capacitor C361 and one the 6th resistance R362；Wherein, the described 5th
The both ends of resistance R363 are electrically connected between second negative input end 9 and the ground terminal GND, and the 6th resistance
The both ends of R362 are electrically connected between second negative input end 9 and the second output terminal 8.It is worth noting that,
First output signal can be electrically connected at described second by one the 7th resistance R365, one end of the 7th resistance R365
Positive input terminal 10 and the first capacitor C361, the other end of the 7th resistance R365 are electrically connected at the first gain list
Member 41, and the both ends of the first capacitor C361 are electrically connected in the second positive input terminal 10 and ground terminal GND
Between.
Meanwhile the voltage clamping unit 43 includes: one second capacitor C364, a first diode D1, one as shown in Figure 3
Three ends controllable voltage-stablizer SR and one second diode D2；Wherein, the controllable voltage-stablizer SR in three end has an anode tap A, one
A cathode terminal C and reference end R, and cathode terminal C and the anode tap A are respectively and electrically connected to the negative of the first diode D1
Extremely with the ground terminal GND.On the other hand, one end of the second capacitor C364 is electrically connected at the current error amplifier
The reference end R of the 21 and controllable voltage-stablizer SR in three end, the other end of the second capacitor C364 are electrically connected at described
Ground terminal GND, and the positive terminal of the first diode D1 is electrically connected to the second output terminal 8.It is worth noting that, described
Second output signal can be by an output resistance R361, and one end of the output resistance R361 is electrically connected to the current error
The other end of the positive terminal of amplifier 21 and the first diode D1, the output resistance R361 is electrically connected to the second gain
Unit, and there is one the 8th resistance R360 between the positive terminal and the circuit voltage VCC of the second diode D2.Also,
The positive terminal of the second diode D2 is electrically connected to a circuit voltage VCC, and its negative pole end is electrically connected to the cathode
Hold C.In this way, be specifically designed by what the circuit framework to the second gain unit 42 and the voltage clamping unit 43 was completed,
Represented by second gain B of the second gain unit 42 is just adjustable, and it is by lower mathematical expression (5).Ri in mathematical expression (5)
It is expressed as an input impedance of the current error amplifier 21.
Second embodiment
Please refer to Fig. 6 and Fig. 7.Wherein, Fig. 6 shows the electricity of the second embodiment of constant power control circuit of the invention
Road architecture diagram, and Fig. 7 shows the functional block diagram of the second embodiment of constant power control circuit of the invention.Compare Fig. 6 and Fig. 3
It can be found that the second embodiment of constant power control circuit 4 only includes a gain unit 41 ' and same voltage clamping unit
43.It must illustrate, the circuit framework of voltage clamping unit 43 does not have altered, therefore is not repeated to illustrate.It is different
In the first gain unit 41 of first embodiment, the gain unit 41 ' of second embodiment only includes: with one first negative input end
13, one first positive input terminal 12, with one first operational amplifier OP1 of one first output end 14, a first resistor R366, one the
A two resistance R368 and third capacitor C362.It is put it is worth noting that, the output resistance R361 is set to first operation
Between the first output end 14 and the positive terminal of first diode D1 of big device OP1.Also, the first operational amplifier OP1's
First positive input terminal 12 is electrically connected to another reference voltage VX；The first negative input end 13 of the first operational amplifier OP1,
It is electrically connected to the voltage sample signal Vsen.
It must especially explain, in aforementioned first embodiment, the reference voltage VREF refers to power supply unit
Or the reference voltage inside power adapter, such as: 2.5V.However, reference voltage VX used in second embodiment is not
Refer to the internal reference voltage.According to the present invention for the design of second embodiment, as shown in the function block 41b of Fig. 7, connecing
After receiving voltage sample signal Vsen and reference voltage VX, the gain unit 41 ' will be based on gain C to voltage sample signal
Vsen executes an enhanced processing, and will then complete the voltage sample signal Vsen and the reference electricity of the enhanced processing
VX is pressed to execute a subtraction process.Unceasingly, as shown in the function block 43b of Fig. 7, in the output for receiving the gain unit 41 '
After signal, the voltage clamping unit 43 will execute voltage clamping processing to the output signal, then export a function
Rate controls reference signal CREF to the current error amplifier 21, and the current error amplifier has a positive input terminal, institute
It states power control reference signal CREF and is even based on the positive input terminal.
In this way, current error amplifier 21 will be interrogated based on the current sample signal Csen and the power control reference
Number CREF and generate a current error signal, and the current error signal is sent to by the control by the photo-coupler OC
Device 23 processed.Finally, the controller 23 can export the power inside PWM control signal to the power conversion module 1
Switch SW, in a manner of by adjusting the ON/OFF period of the power switch SW, enable the output electric current of power conversion module 1 with
Actual output voltage adjustment (downgrading), reach overload current protection function.Further, and reach simultaneously and determine power output
The function of control.In order to enable the output electric current of power conversion module 1 adjust and (downgrade) to reach overload with actual output voltage
Current protection and the function of determining power output control, it is necessary to the suitably gain C of planning and designing gain unit 41 '.Please first join
Examine following mathematical expression (6), (7), (8) and (9).
C=A × B ... ... ... ... ... ... ... .. ... .. (6)
VX=VREF×B……………………………….……..(7)
In this way, it is above-mentioned completely and the circuit of all embodiments for clearly demonstrating constant power control circuit 4 of the invention
Framework, via above-mentioned, it is following that we can learn that the present invention has the advantages that:
(1) shown in Fig. 1, error calculation unit 16 ' used in the prior art only can be tieed up solely with control unit 17 '
Hold power supply unit 1 ' constant voltage output or constant current output and the power supply unit 1 ' maintenance can not be regulated and controled to determine power defeated
Out.In view of this, the present invention propose can be applied to existing feedback circuit 2 one of constant power control circuit 4, circuit frame
Structure includes: one first gain unit 41, one second gain unit 42 and a voltage clamping unit 43；Wherein, first gain
Unit 41 will then be completed mainly to execute one first enhanced processing to voltage sample signal Vsen based on the first gain A
The voltage sample signal Vsen and a reference voltage VREF of first enhanced processing execute a subtraction process.Another party
Face, the second gain unit 42 is to execute one the to the first output signal of first gain unit 41 based on the second gain B
Two enhanced processings, and voltage clamping unit 43 then executes a voltage clamping to the second output signal to the second gain unit 42
Processing, then exports a power control reference signal CREF to the current error amplifier 21.In this way, current error amplifier
21 will generate a current error signal based on a current sample signal Csen and the power control reference signal CREF, and
The current error signal is sent to the controller 23 by the photo-coupler OC, the controller 23 is led to
The ON/OFF period for crossing control power switch SW enables the output electric current of power conversion module 1 (adjust with actual output voltage adjustment
Drop), reach overload current protection and determines the function of power output control.
(2) in addition to this, it is necessary to, it is emphasized that constant power control circuit 4 of the invention is not limited to be applied to power supply supply
Feedback circuit inside device or power adapter can also be applied in any variable-pressure charger, adjust to meet
Output voltage is dropped, makes to export electric current increase with benefit charging.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, it is any who know
Those skilled in the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all cover
Within protection scope of the present invention.
Claims (15)
1. a kind of constant power control circuit is applied in a feedback circuit, wherein the feedback circuit is missed including at least an electric current
Poor amplifier and a voltage error amplifier；Also, the constant power control circuit includes:
One first gain unit is electrically connected to a voltage sample signal and a reference voltage, to be based on one first gain pair
The voltage sample signal and the reference voltage execute one first enhanced processing, and will then complete at first amplification
The voltage sample signal and the reference voltage of reason execute a calculation processing；
One second gain unit is electrically connected to first gain unit, to receive the one of first gain unit
One output signal, and one second enhanced processing is executed to first output signal based on one second gain；And
One voltage clamping unit is electrically connected to second gain unit, to receive the one of second gain unit
Two output signals, and voltage clamping processing is executed to second output signal, then export a power control reference signal
To the current error amplifier.
2. constant power control circuit according to claim 1, which is characterized in that the feedback circuit further include:
One voltage sampling unit is electrically connected between the voltage error amplifier and the output end of a power conversion module；
Also, the voltage sampling unit provides the voltage sample signal simultaneously and gives first gain unit；
One current sampling unit, be electrically connected at the current error amplifier and the power conversion module output end it
Between, to provide a current sample signal to the current error amplifier；
One photo-coupler is electrically connected to the current error amplifier and the voltage error amplifier；And
One controller is electrically connected to the photo-coupler；
Wherein, the current error amplifier has a positive input terminal, and the power control reference signal is linked in described just defeated
Enter end, the current error amplifier is to generate an electricity based on the current sample signal and the power control reference signal
Stream error signal, and the current error signal is sent to by the controller by the photo-coupler.
3. constant power control circuit according to claim 1, which is characterized in that the power conversion module is located at an electronics
The inside of device, and the electronic device can for it is following any one: power adapter, power supply unit or variable-pressure charger.
4. constant power control circuit according to claim 1, which is characterized in that first gain unit includes:
One first operational amplifier has one first negative input end, one first positive input terminal；Wherein, it is executing at the calculating
When reason, the voltage sample signal is electrically connected to first negative input end；And the reference voltage is electrically connected to institute
State the first positive input terminal.
5. constant power control circuit according to claim 1, which is characterized in that first gain unit includes:
One first operational amplifier has one first negative input end, one first positive input terminal and one first output end；
One first resistor, both ends are electrically connected between first negative input end and first output end；
One second resistance, both ends are electrically connected between the voltage sample signal and first negative input end；
One 3rd resistor, both ends are electrically connected between the reference voltage and first positive input terminal；And
One the 4th resistance, both ends are electrically connected between a ground terminal and first positive input terminal；
Wherein, there is one first ratio, and the 3rd resistor and described the between the first resistor and the second resistance
There is one second ratio between four resistance；Also, first ratio is equal with second ratio.
6. constant power control circuit according to claim 1, which is characterized in that second gain unit includes:
One second operational amplifier has one second positive input terminal, one second negative input end and a second output terminal；
One first capacitor, both ends are electrically connected between second positive input terminal and a ground terminal；
One the 5th resistance, both ends are electrically connected between second negative input end and the ground terminal；
One the 6th resistance, both ends are electrically connected between second negative input end and the second output terminal；And
First output signal can be by one the 7th resistance, and it is just defeated that one end of the 7th resistance is electrically connected at described second
Enter end and first capacitor, the other end of the 7th resistance is electrically connected at first gain unit.
7. constant power control circuit according to claim 1, which is characterized in that the voltage clamping unit includes:
The controllable voltage-stablizer in one or three ends has an anode tap, a cathode terminal and a reference end；Wherein, the cathode terminal is electrically connected
To the negative pole end of a first diode, and the anode tap is electrically connected to a ground terminal.
8. constant power control circuit according to claim 7, which is characterized in that the voltage clamping unit includes:
Second output signal can be electrically connected to the current error by an output resistance, one end of the output resistance
The positive terminal of amplifier and the first diode, the other end of the output resistance are electrically connected to the second gain list
Member；And
One second capacitor, one end of second capacitor is electrically connected at the current error amplifier and three end is controllably steady
The reference end of depressor, the second capacitor other end are electrically connected at the ground terminal.
9. a kind of constant power control circuit is applied in a feedback circuit, wherein the feedback circuit is missed including at least an electric current
Poor amplifier and a voltage error amplifier；Also, the constant power control circuit includes:
One gain unit is electrically connected to a voltage sample signal and a reference voltage, to be based on a gain to the voltage
It samples signal and the reference voltage executes an enhanced processing, and will then complete the voltage sample of the enhanced processing
Signal and the reference voltage execute a calculation processing；And
One voltage clamping unit, is electrically connected to the gain unit, to receive an output signal of the gain unit, and
The processing of one voltage clamping is executed to the output signal, a power control reference signal to the current error is then exported and amplifies
Device.
10. constant power control circuit according to claim 9, which is characterized in that the feedback circuit further include:
One voltage sampling unit is electrically connected between the voltage error amplifier and the output end of a power conversion module；
Also, the voltage sampling unit provides the voltage sample signal simultaneously and gives the gain unit；
One current sampling unit, be electrically connected at the current error amplifier and the power conversion module output end it
Between, to provide a current sample signal to the current error amplifier；
One photo-coupler is electrically connected to the current error amplifier and the voltage error amplifier；And
One controller is electrically connected to the photo-coupler；
Wherein, the current error amplifier has a positive input terminal, and the power control reference signal is linked in described just defeated
Enter end, the current error amplifier is based on the current sample signal and the power control reference signal and generates an electric current
Error signal, and the current error signal is sent to by the controller by the photo-coupler.
11. constant power control circuit according to claim 9, which is characterized in that the power conversion module is located at an electricity
Within sub-device, and the electronic device can for it is following any one: power adapter, power supply unit or variable-pressure charger.
12. constant power control circuit according to claim 9, which is characterized in that first gain unit includes:
One first operational amplifier has one first negative input end, one first positive input terminal；Wherein, it is executing at the calculating
When reason, the voltage sample signal is electrically connected to first negative input end；And the reference voltage is electrically connected to institute
State the first positive input terminal.
13. constant power control circuit according to claim 9, which is characterized in that the gain unit includes:
One operational amplifier has one first negative input end, one first positive input terminal and one first output end；
One first resistor, both ends are electrically connected between first negative input end and first output end；And
One second resistance, both ends are electrically connected between the voltage sample signal and first negative input end.
14. constant power control circuit according to claim 9, which is characterized in that the voltage clamping unit includes:
The controllable voltage-stablizer in one or three ends has an anode tap, a cathode terminal and a reference end；Wherein, the cathode terminal is electrically connected
To the negative pole end of a first diode, and the anode tap is electrically connected to a ground terminal.
15. constant power control circuit according to claim 14, which is characterized in that the voltage clamping unit includes:
Second output signal can be electrically connected to the current error by an output resistance, one end of the output resistance
The positive terminal of amplifier and the first diode, the other end of the output resistance are electrically connected to the gain unit；With
And
One second capacitor, one end of second capacitor is electrically connected at the current error amplifier and three end is controllably steady
The other end of the reference end of depressor, second capacitor is electrically connected at the ground terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810151400.0A CN110165870B (en) | 2018-02-14 | 2018-02-14 | Constant power control circuit |
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|---|---|---|---|
| CN201810151400.0A CN110165870B (en) | 2018-02-14 | 2018-02-14 | Constant power control circuit |
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| CN110165870B CN110165870B (en) | 2021-02-26 |
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| CN110165870B (en) | 2021-02-26 |
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