CN101393464B - Electric voltage constant and current constant transfer controller - Google Patents
Electric voltage constant and current constant transfer controller Download PDFInfo
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- CN101393464B CN101393464B CN2007101519203A CN200710151920A CN101393464B CN 101393464 B CN101393464 B CN 101393464B CN 2007101519203 A CN2007101519203 A CN 2007101519203A CN 200710151920 A CN200710151920 A CN 200710151920A CN 101393464 B CN101393464 B CN 101393464B
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Abstract
The invention relates to a constant voltage and constant current switching controller, which comprises a voltage detecting and switching circuit, a current detecting and switching circuit and an error amplifying circuit, wherein the voltage detecting and switching circuit receives at least one output voltage detection signal and a first reference voltage signal and outputs at least one voltage detecting and switching reference signal; the current detecting and switching circuit receives at least one output current detection signal and one second reference voltage signal and outputs at least one current detecting and switching reference signal; and the error amplifying current receives the voltage detecting and switching reference signal, the current detecting and switching reference signal and a third reference voltage signal and outputs at least one error amplifying signal, wherein the error amplifying circuit outputs the at least one error amplifying signal according to the voltage detecting and switching reference signal and the third reference voltage signal when the quasi-phase of the voltage detecting and switching reference signal is larger than that of the current detecting and switching reference signal, and outputs the at least one error amplifying signal according to the current detecting and switching reference signal and the third reference voltage signal when the quasi-phase of the voltage detecting and switching reference signal is smaller than that of the current detecting and switching reference signal. Therefore, the constant voltage and constant current switching controller can realize constant voltage and constant current switching control.
Description
Technical field
The present invention relates to a kind of power transfer control circuit, particularly a kind ofly decide voltage and decide the current conversion control circuit.
Background technology
Decide voltage and decide current conversion control and can be applied to the lithium cell charging module, and the current limliting Voltage stabilizing module etc.
The lithium cell charging module is at first utilized and is decided Current Control, makes lithium battery rapid charge in this decides current control cycle; When the protection value was preset in the accurate arrival one in lithium battery voltage position, the lithium cell charging module is converted to again decided Control of Voltage, with certain control lithium battery voltage position standard, realizes li-ion cell protection and lithium cell charging mechanism.
Control of Voltage is decided in the utilization of current limliting Voltage stabilizing module, with certain control output load voltage; When the protection value was preset in output load current arrival one, the current limliting Voltage stabilizing module is converted to decided Current Control, with certain control output load current, realized the purpose of output load current-limiting protection.
Fig. 1 carries out the circuit diagram of voltage and Current Control for existing application two error amplifiers.This circuit 10 utilizes an error amplifier 101 to receive application module output voltage feedback signal VOS and the accurate VR in reference voltage position carries out Voltage Feedback control, thereby the realization application module is decided Control of Voltage; Simultaneously, utilize an error amplifier 102 reception application module output current feedback signal VCSP and VCSN to carry out Current Feedback Control, thereby the realization application module is decided Current Control; Wherein, the anti-system of error amplifier 101,102 output terminals control competition is realized by diode 103,104 respectively, output control signal VFB power controlling modular converter.When the shortcoming of this circuit 10 compensates for the realization control loop, need individually voltage feedback loop and current feedback loop to be compensated, thereby increased compensating circuit and module cost.
Fig. 2 carries out the circuit diagram of voltage and Current Control for another existing application two error amplifiers.This circuit 20 utilizes an error amplifier 201 to receive application module output voltage feedback signal VOS and the accurate VR in reference voltage position carries out Voltage Feedback control, thereby the realization application module is decided Control of Voltage; Simultaneously, utilize an error amplifier 202 reception application module output current feedback signal VCSP and VCSN to carry out Current Feedback Control, thereby the realization application module is decided Current Control; Wherein, the anti-system of error amplifier 201,202 output terminals control competition is realized by error amplifier 203, output control signal VFB power controlling modular converter.The shortcoming of this circuit 20 is that error amplifier 203 is difficult for certain ride gain when realizing circuit controls, thereby is difficult for accurately design control loop.
Summary of the invention
The objective of the invention is to, propose certain voltage and decide the current conversion control circuit, utilize and detect output voltage and current signal, and preset reference voltage level, constitute the function that application module output voltage and current signal detect and error is amplified, realize deciding the purpose that voltage is decided current conversion control.
To achieve these goals, the invention provides a kind of electric voltage constant and current constant transfer controller, comprise a voltage detecting change-over circuit, a current detecting change-over circuit, and an error amplifying circuit.This voltage detecting change-over circuit receives at least one voltage sense signal and one first reference voltage signal, and exports at least one voltage detecting conversion reference signal.This current detecting change-over circuit receives at least one output current detection signal and one second reference voltage signal, and exports at least one current detecting conversion reference signal.This error amplifying circuit receives this voltage detecting conversion reference signal, this current detecting conversion reference signal and one the 3rd reference voltage signal, and exports at least one error amplification signal.Wherein, when the accurate position of reference signal was changed greater than this current detecting in this accurate position of voltage detecting conversion reference signal, this error amplifying circuit was according to this voltage detecting conversion reference signal and this at least one error amplification signal of the 3rd reference voltage signal output; When the accurate position of reference signal was changed less than this current detecting in this accurate position of voltage detecting conversion reference signal, this error amplifying circuit was according to this current detecting switching signal and this at least one error amplification signal of the 3rd reference voltage signal output.Can realize deciding voltage like this and decide current conversion control.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 carries out the circuit diagram of voltage and Current Control for existing application two error amplifiers;
Fig. 2 carries out the circuit diagram of voltage and Current Control for another existing application two error amplifiers;
Fig. 3 decides the circuit diagram that voltage is decided the current conversion control circuit for the present invention;
Fig. 4 is the circuit diagram of an embodiment of the voltage sensing circuit among Fig. 3;
Fig. 5 is the circuit diagram of an embodiment of the current sense circuit among Fig. 3;
Fig. 6 is the circuit diagram of an embodiment of the voltage detecting change-over circuit among Fig. 3;
Fig. 7 is the circuit diagram of an embodiment of the current detecting change-over circuit among Fig. 3;
Fig. 8 is the circuit diagram of an embodiment of the error amplifying circuit among Fig. 3.
Wherein, Reference numeral:
10,20,35-decides voltage and decides the current conversion control circuit
101,102-error amplifier
103,104-diode
201,202,203-error amplifier
The 30-power conversion module
The 31-power conversion stage
The 32-output load
The 33-voltage sensing circuit
The 34-current sense circuit
35-decides voltage and decides the current conversion control circuit
351-voltage detecting change-over circuit
352-current detecting change-over circuit
The 353-error amplifying circuit
3611,3621-transduction amplifier
3612,3622-resistance
3613,3623-operational amplifier
The 3631-amplifier of transduceing
The 3632-compensating load
801,802,803,804,805,806,807,808,809,810,811-transistor
821-resistance
822-electric capacity
Embodiment
The present invention uses the error amplifier of three ends to carry out comparison between output voltage feedback signal, output current feedback signal and reference voltage, thereby realize deciding Current Control and reach the switching of deciding voltage control function, simultaneously, can utilize the voltage/current detection change-over circuit to come convergent-divergent, adjust the accurate position of output voltage feedback signal and output current feedback signal, thereby reach the adjustment that adjustment is decided Control of Voltage and decided Current Control point.Describe active electric pressure-controlled gate driver circuit of the present invention in detail below with reference to icon.
Fig. 3 is the circuit diagram that voltage is decided the current conversion control circuit of deciding of the present invention.As shown in Figure 3, this is decided voltage and decides the current conversion control circuit and comprise a voltage sensing circuit 33, a current sense circuit 34 and certain voltage and decide current conversion controller 35.This electric voltage constant and current constant transfer controller 35 comprises a voltage detecting change-over circuit 351, one current detecting change-over circuits 352, and an error amplifying circuit 353.Should decide voltage decide current conversion control circuit 35 and utilize a voltage detecting change-over circuit 351, the voltage sense signal VOS that reception is exported by voltage sensing circuit 33 (in fact, voltage sense signal VOS is as one group of voltage signal VOSP among following Fig. 4, the voltage difference of VOSN), receive one first reference voltage signal VR1 again, make the voltage detecting conversion reference signal VOI that exports once the accurate conversion in DC voltage position.In the present embodiment, VOI=VR1+A1*VOS, A1 are the gain of voltage detecting change-over circuit 351, and wherein, voltage detecting conversion reference signal VOI is not subjected to making output load 32 and the not influence on ground altogether of power conversion module 30 because of current sense circuit 34; Utilize a current detecting change-over circuit 352 again, the output current detection signal VCS that reception is exported by current sense circuit 34 (in fact, output current detection signal VCS is as one group of voltage signal VCSP among following Fig. 5, the voltage difference of VCSN, VCSN be system altogether), receive one second reference voltage signal VR2 again, make the current detecting conversion reference signal VCI that exports once the accurate conversion in DC voltage position, in the present embodiment, VCI=VR2+A2*VCS, A2 are the gain of current detecting change-over circuit 352; Utilize an error amplifying circuit 353 again, receive aforesaid voltage detecting conversion reference signal VOI, and aforesaid current detecting conversion reference signal VCI, and one the 3rd reference voltage signal VR3.When voltage detecting conversion reference signal VOI changes reference signal VCI greater than current detecting, constitute error amplification signal VFB by voltage detecting conversion reference signal VOI and the 3rd reference voltage signal VR3, this time error amplifier stage is voltage circuit control, regulation and control power conversion stage 31 makes that output load voltage VLOAD is a stable voltage of setting, and power conversion module 30 is for deciding Voltage Feedback control.When voltage detecting conversion reference signal VOI changes reference signal VCI less than current detecting, constitute error amplification signal VFB by current detecting conversion reference signal VCI and the 3rd reference voltage signal VR3, this time error amplifier stage is current return control, regulation and control power conversion stage 31 makes that output load current ILOAD is a stable electrical flow valuve of setting, and power conversion module 30 is for deciding Current Feedback Control; Therefore can realize deciding the purpose that voltage is decided current conversion control.Wherein, power conversion stage 31 is the transfer function of output power VOUT and power input VIN.
Fig. 4 is the circuit diagram of an embodiment of the voltage sensing circuit 33 among Fig. 3, uses and divides piezoelectricity group R1, and R2 makes that voltage sense signal VOS is the pantograph ratio of output voltage VO, wherein, and VOS=VO*R2/ (R1+R2).In actual applications, voltage sensing circuit 33, current sense circuit 34 remove as shown in Figure 4 with output load 32, voltage sensing circuit 33 and output load 32 backs in parallel also can be voltage sensing circuit 33 and output load 32 of connecting and current sense circuit 34 parallel connections with outside current sense circuit 34 is connected.Certainly, under such series relationship, voltage detection signal VOS will comprise the cross-pressure of output load 32 and current sense circuit 34.And because power conversion module 31 is controlled at (under the situation of current return control) or following (under the situation of voltage circuit control) near the predetermined cross-pressure value thereby the influence that can remove current sense circuit 34 cross-pressures by compensation by FEEDBACK CONTROL with the cross-pressure of current sense circuit 33.Even under high output voltage or some particular cases, it is little or do not influence under the operation of power conversion module 31 that the cross-pressure of current sense circuit 34 accounts for the ratio of voltage sense signal VOS, also can not need the cross-pressure of offset current sensing circuit 34.
Fig. 5 is the circuit diagram of an embodiment of the current sense circuit 34 among Fig. 3, uses a sensing resistor RS and an output current IO, can realize output current detection signal VCS, wherein, and VCS=RS*IO.In actual applications, current sense circuit 33 and output load 34 are flowed through earlier except that electric current as shown in Figure 3 and are flowed through current sense circuit 34 again to the series relationship on ground after the output load 32, also can arrive the series relationship on ground for the output load 32 of flowing through again behind the current sense circuit 34 of flowing through earlier, to solve power conversion module 30 and output load 32 problem of demand altogether.
Fig. 6 is the circuit diagram of an embodiment of the voltage detecting change-over circuit 351 among Fig. 3.This circuit 361 utilizes a transduction amplifier 3611, makes the output voltage signal VOSP of voltage sensing circuit 33, and VOSN carries out diversity ratio, exports a difference currents IGM1; Utilize a feedback resistance 3612 and an operational amplifier 3613 again, constitute a feedback gain amplifier, carry out the accurate conversion in DC voltage position and amplify realization voltage detecting conversion reference signal VOI according to one first reference voltage VR1 and aforementioned difference currents IGM1; Wherein, VOI=VR1+A1*VOS, VOS are voltage signal VOSP, the difference of VOSN, and A1 is the gain of voltage detecting change-over circuit 361, A1=GMI1*RI1, GMI1 is the transduction value of transduction amplifier 3611, RI1 is the resistance value of resistance 3612.
Fig. 7 is the circuit diagram of an embodiment of the current detecting change-over circuit 352 among Fig. 3.This circuit 362 utilizes a transduction amplifier 3621, makes the output voltage signal VCSP of current sense circuit 34, and VCSN carries out diversity ratio, exports a difference currents IGM2; Utilize a feedback resistance 3622 and an operational amplifier 3623 again, constitute a feedback gain amplifier, carry out the accurate conversion in DC voltage position and amplify realization current detecting conversion reference signal VCI according to one second reference voltage VR2 and aforementioned difference currents IGM2; Wherein, VCI=VR2+A2*VCS, VCS are voltage signal VCSP, the difference of VCSN, and A2 is the gain of current detecting change-over circuit 362, A2=GMI2*RI2, GMI2 is the transduction value of transduction amplifier 3621, RI2 is the resistance value of resistance 3622.
Though the embodiment of Fig. 6 and Fig. 7 is that example is introduced with voltage detecting change-over circuit and current detecting change-over circuit respectively, yet in fact the embodiment of Fig. 6 and Fig. 7 all can use as voltage detecting change-over circuit or current detecting change-over circuit and not be restricted.
As previously mentioned, voltage detecting change-over circuit 351 of the present invention is in order to convergent-divergent, adjustment voltage sense signal VOS, current detecting change-over circuit 352 is adjusted deciding Current Control or deciding the Control of Voltage point of power conversion module 30 in order to convergent-divergent, adjustment output current detection signal VCS thereby reach.And the circuit in the practical application can add or omits voltage detecting change-over circuit 351 and current detecting change-over circuit 352 according to whether adjusting voltage detection signal VOS and output current detection signal VCS.
Fig. 8 is the circuit diagram of an embodiment of the error amplifying circuit 353 of Fig. 3.This circuit 363 comprises a transduction amplifier 3631 and a compensating load 3632.It is right that this transduction amplifier 3631 constitutes differential amplification by transistor 801,802,803, and resistance 804 constitutes the transduction source, and reference current source 812, and transistor 808,809,810,811 constitute the bias current source, and transistor 805,806 constitutes active load; Wherein, relatively the 3rd reference voltage VR3 and voltage detecting conversion reference signal VOI and current detecting are changed the difference current that is produced by resistance 804 behind the reference signal VCI to transistor 806 to (transistor 801,802,803) by differential amplification in order to transmit, transistor 805 is the symmetry load, in order to realize differential amplification symmetry; Transistor 807 forms current mirror with aforementioned transistor 806, in order to carry out electric current output, according to the bias current source of aforementioned transistor 811, determines the output current value of this transduction amplifier 3631.This compensating load 3632 comprises pull-up resistor 821 and building-out capacitor 822, and the main output current value that receives transduction amplifier 3631 is realized the error amplification signal VFB of error amplifying circuit 363 outputs, can realize the loop compensation of power conversion module simultaneously.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (8)
1. an electric voltage constant and current constant transfer controller is characterized in that, comprises:
One detects change-over circuit, receives at least one output current detection signal and one first reference voltage signal, and exports at least one current detecting reference signal;
One error amplifying circuit receives a voltage sense signal, this current detecting reference signal, and one second reference voltage signal, and exports at least one error amplification signal;
Wherein, when the accurate position of this current detecting reference signal during greater than the accurate position of this voltage sense signal, this error amplifying circuit is exported this at least one error amplification signal according to this current detecting reference signal and this second reference voltage signal; When the accurate position of this current detecting reference signal during less than the accurate position of this voltage sense signal, this error amplifying circuit is exported this at least one error amplification signal according to this voltage sense signal and this second reference voltage signal.
2. electric voltage constant and current constant transfer controller as claimed in claim 1, it is characterized in that, this detection change-over circuit comprises a transduction amplifier and a feedback gain amplifier, export a difference currents after this transduction amplifier receives this at least one output current detection signal, this feedback gain amplifier produces this current detecting reference signal according to this difference currents and this first reference voltage signal.
3. an electric voltage constant and current constant transfer controller is characterized in that, comprises:
One detects change-over circuit, receives a voltage sense signal and one first reference voltage signal, and exports at least one voltage detecting reference signal;
One error amplifying circuit receives an output current detection signal, this voltage detecting reference signal, and one second reference voltage signal, and exports at least one error amplification signal;
Wherein, when the accurate position of this voltage detecting reference signal during greater than the accurate position of this output current detection signal, this error amplifying circuit is exported this at least one error amplification signal according to this voltage detecting reference signal and this second reference voltage signal; When the accurate position of this voltage detecting reference signal during less than the accurate position of this output current detection signal, this error amplifying circuit is exported this at least one error amplification signal according to this output current detection signal and this second reference voltage signal.
4. electric voltage constant and current constant transfer controller as claimed in claim 3, it is characterized in that, this detection change-over circuit comprises a transduction amplifier and a feedback gain amplifier, this transduction amplifier is exported a difference currents after receiving this voltage sense signal, and this feedback gain amplifier produces this voltage detecting reference signal according to this difference currents and this first reference voltage signal.
5. decide voltage and decide the current conversion control circuit for one kind, it is characterized in that, comprise:
One current sense circuit produces at least one output current detection signal according to an output current of the load of flowing through;
One voltage sensing circuit produces a voltage sense signal according to this load;
One detects change-over circuit, receives this at least one output current detection signal, and one first reference voltage signal, and exports at least one current detecting reference signal;
One error amplifying circuit receives a voltage sense signal, this current detecting reference signal, and one second reference voltage signal, and exports at least one error amplification signal;
Wherein, when the accurate position of this current detecting reference signal during greater than the accurate position of this voltage sense signal, this error amplifying circuit is exported this at least one error amplification signal according to this current detecting reference signal and this second reference voltage signal; When the accurate position of this current detecting reference signal during less than the accurate position of this voltage sense signal, this error amplifying circuit is exported this at least one error amplification signal according to this voltage sense signal and this second reference voltage signal.
6. as claimed in claim 5ly decide voltage and decide the current conversion control circuit, it is characterized in that, this detection change-over circuit comprises a transduction amplifier and a feedback gain amplifier, export a difference currents after this transduction amplifier receives this at least one output current detection signal, this feedback gain amplifier produces this current detecting reference signal according to this difference currents and this first reference voltage signal.
7. as claimed in claim 5ly decide voltage and decide the current conversion control circuit, it is characterized in that this voltage sensing circuit and this current sense circuit of connecting and this load parallel connection.
8. as claimed in claim 5ly decide voltage and decide the current conversion control circuit, it is characterized in that, connect with this current sense circuit after this voltage sensing circuit and this load parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101519203A CN101393464B (en) | 2007-09-20 | 2007-09-20 | Electric voltage constant and current constant transfer controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101519203A CN101393464B (en) | 2007-09-20 | 2007-09-20 | Electric voltage constant and current constant transfer controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101393464A CN101393464A (en) | 2009-03-25 |
| CN101393464B true CN101393464B (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101519203A Expired - Fee Related CN101393464B (en) | 2007-09-20 | 2007-09-20 | Electric voltage constant and current constant transfer controller |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI479293B (en) | 2012-06-06 | 2015-04-01 | Mult-channel constant voltage and constant current converting controler and apparatus | |
| CN103488218B (en) * | 2012-06-14 | 2015-06-17 | 登丰微电子股份有限公司 | Multi-channel constant-voltage and constant-current switching control circuit and multi-channel constant-voltage and constant-current switching control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023541A (en) * | 1990-03-23 | 1991-06-11 | Hewlett-Packard Company | Power supply control circuit having constant voltage and constant current modes |
| US6166521A (en) * | 1999-01-21 | 2000-12-26 | National Semiconductor Corporation | Current-to-voltage transition control of a battery charger |
-
2007
- 2007-09-20 CN CN2007101519203A patent/CN101393464B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023541A (en) * | 1990-03-23 | 1991-06-11 | Hewlett-Packard Company | Power supply control circuit having constant voltage and constant current modes |
| US6166521A (en) * | 1999-01-21 | 2000-12-26 | National Semiconductor Corporation | Current-to-voltage transition control of a battery charger |
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| CN101393464A (en) | 2009-03-25 |
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