CN201523322U - Adaptive constant voltage control circuit and adaptive power conversion controller - Google Patents
Adaptive constant voltage control circuit and adaptive power conversion controller Download PDFInfo
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- CN201523322U CN201523322U CN2009202188772U CN200920218877U CN201523322U CN 201523322 U CN201523322 U CN 201523322U CN 2009202188772 U CN2009202188772 U CN 2009202188772U CN 200920218877 U CN200920218877 U CN 200920218877U CN 201523322 U CN201523322 U CN 201523322U
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Abstract
The utility model discloses an adaptive constant voltage control circuit and an adaptive power conversion controller. The adaptive power conversion controller is coupled with a load and a power switching circuit; the adaptive power conversion controller comprises an adaptive voltage sensing unit and a switching control circuit, wherein the adaptive voltage sensing unit is coupled with the load and outputs voltage sensing signals according to the load voltage of the load or the load current of the load and a load voltage; the switching control circuit is used for receiving the voltage sensing signals and determining that the power switching circuit supplies power to the load according the current sensing signals or according to the voltage sensing signals by making a comparison between the voltage sensing signals and a pair of current sensing signals applied to the load current.
Description
Technical field
The utility model relates to a certain voltage control circuit and a power conversion controller, particularly relates to an adaptive constant voltage control circuit and an adaptive power conversion controller.
Background technology
Deciding voltage decides the conversion and control of electric current and often is applied to lithium cell charging module and current limliting Voltage stabilizing module (current-limiting constant-voltage regulator) etc.With regard to the lithium cell charging module, in the charging process of lithium battery, the lithium cell charging module is at first by deciding the mode of Current Control, makes lithium battery quick charge in this decides current control cycle.Subsequently, when the lithium battery voltage level arrived an acquiescence protection value, the lithium cell charging module is converted to again decided voltage control, with certain strangulation lithium battery voltage level, reaches the purpose of li-ion cell protection.With regard to the current limliting Voltage stabilizing module, voltage control is decided in the utilization of current limliting Voltage stabilizing module, with certain control output loading voltage.When output load current arrived an acquiescence protection value, the current limliting Voltage stabilizing module is converted to decided Current Control, with certain strangulation output load current, realizes the purpose of output loading current-limiting protection.
Fig. 1 is the schematic diagram of the electric voltage constant and current constant transfer controller 10 of a prior art.As shown in FIG., electric voltage constant and current constant transfer controller 10 is coupled to a power-switching circuit 11, and this power-switching circuit 11 is in order to supply electric power to one load 12.This electric voltage constant and current constant transfer controller 10 has a voltage sensing circuit 13, a current sensing circuit 14, a direct current voltage level converting 151 and an error amplifying circuit 152.Wherein, the voltage of voltage sensing circuit 13 detecting output loadings is to export a voltage sense signal VOS.The electric current of current sensing circuit 14 detecting output loadings is to export a current sensing signal VCS.DC voltage level change-over circuit 151 receives this current sensing signal VCS, and the level of foundation one first reference voltage signal VR1 adjustment current sensing signal VCS, to export a current detecting reference signal VCI.Error amplifying circuit 152 receives aforesaid voltage sensing signal VOS, aforementioned currents reference signal detection VCI and one second reference voltage signal VR2, to export an error amplification signal VFB.
When the level of voltage sense signal VOS was higher than current detecting reference signal VCI, error amplifying circuit 152 produced error amplification signal VFB according to the voltage sense signal VOS and the second reference voltage signal VR2.At this moment, the error amplifying stage is voltage circuit control, and electric voltage constant and current constant transfer controller 10 is for deciding voltage feedback control.When the level of voltage sense signal VOS was lower than current detecting reference signal VCI, error amplifying circuit 152 produced error amplification signal VFB according to the current detecting reference signal VCI and the second reference voltage signal VR2.At this moment, the error amplifying stage is current circuit control, and electric voltage constant and current constant transfer controller 10 is for deciding current feedback control.Whereby, can realize deciding the target that voltage is decided current conversion control.
Fig. 2 is the voltage of employing electric voltage constant and current constant transfer controller 10 outputs shown in Figure 1 and the graph of a relation of electric current.As shown in FIG., under constant voltage mode, output current is when deciding upper current limit that Current Control sets, the voltage stabilized voltage characteristic of deciding voltage feedback control can be subjected to deciding the interference of current feedback control, make load voltage descend, and cause the error amount of feedback control to increase, influence the output stabilized voltage characteristic of electric voltage constant and current constant transfer controller 10.
The utility model content
In view of the above problems, the purpose of this utility model is to propose an adaptive power conversion controller and adaptive constant voltage control circuit, sensing load voltage and load current or input current are to produce a voltage sense signal, again by comparing this voltage sense signal and a current sensing signal corresponding to load current, decision is decided the purpose of current conversion control according to current sensing signal or according to voltage sense signal control to realize adaptive constant voltage.
For achieving the above object, the utility model provides a kind of adaptive power conversion controller, is coupled to a load and a power-switching circuit.This adaptive power conversion controller comprises an adaptive voltage sensing cell and a conversion control circuit.Wherein, the adaptive voltage sense unit is exported a voltage sense signal from a load current and a load voltage of load.Conversion control circuit is in order to receive the aforesaid voltage sensing signal, and by comparative voltage sensing signal and a current sensing signal corresponding to load current, to determine according to current sensing signal or controlling this power-switching circuit according to voltage sense signal provides electrical power to this load.
The utility model provides another kind of adaptive power conversion controller, is coupled to a load and a power-switching circuit.This adaptive power conversion controller comprises an adaptive voltage sensing cell and a conversion control circuit.One input current of adaptive voltage sense unit power-switching circuit with export a voltage sense signal from a load voltage of load.Conversion control circuit is in order to receive the aforesaid voltage sensing signal, and, provide electrical power to load according to current sensing signal or voltage sense signal control power-switching circuit with decision by a comparative voltage sensing signal and a current sensing signal corresponding to input current.
In an embodiment of the present utility model, aforementioned adaptive voltage sensing cell comprises one first resistance, one second resistance and one the 3rd resistance.These three resistance connect into a resistance string.The two ends of this resistance string are coupled to the output of power-switching circuit and the earth terminal of load respectively, and constitute a circuit loop with load.Wherein, the cross-pressure of second resistance and the 3rd resistance and be voltage sense signal, the cross-pressure of the 3rd resistance is current sensing signal.
In another embodiment of the present utility model, this adaptive power conversion controller more comprises a current sensing unit.This current sensing unit has one the 4th resistance, is serially connected with between load and the earth terminal or between the output of load and power-switching circuit.The cross-pressure of the 4th resistance is current sensing signal.
The utility model also provides a kind of adaptive constant voltage control circuit.This adaptive constant voltage control circuit is coupled to a power-switching circuit, and the output of this power-switching circuit is coupled to a load so that electric power to be provided.This adaptive constant voltage control circuit comprises an adaptive voltage sensing cell and a control unit.Wherein, the adaptive voltage sensing cell is coupled to load, and according to exporting a voltage sense signal from a load current and a load voltage of load.Control unit receives an aforesaid voltage sensing signal and a reference voltage signal, and provides electrical power to load according to voltage sense signal and reference voltage signal control power-switching circuit.
The utility model also provides a kind of adaptive constant voltage control circuit.This adaptive constant voltage control circuit is coupled to a power-switching circuit, and the output of this power-switching circuit is coupled to a load.This adaptive constant voltage control circuit comprises an adaptive voltage sensing cell and a control unit.Wherein, the adaptive voltage sensing cell is coupled to load, and according to an input current of power-switching circuit with export a voltage sense signal from a load voltage of load.Control unit receives a voltage sense signal and a reference voltage signal, and exports according to the electric power of voltage sense signal and reference voltage signal control power-switching circuit.
The utility model is being decided under the voltage control, and voltage sense signal can be compensated because of the rising of load current.At this moment, the error amplification signal exported of error amplifying circuit then can be inclined to the raising output voltage.Thereby can overcome in the prior art, to decide near the Current Control point deciding voltage, the voltage stabilized voltage characteristic of deciding voltage feedback control can be subjected to deciding the problem of the interference of current feedback control.In addition, can compensate fax and pass the pressure drop that causes because of cable in the process, so that load voltage accurately to be provided.
Above general introduction and ensuing detailed description are all exemplary in nature, are in order to further specify claim protection range of the present utility model.And relevant other objects and advantages of the present utility model will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram of a prior art electric voltage constant and current constant transfer controller;
The voltage of the output that electric voltage constant and current constant transfer controller is controlled of Fig. 2 displayed map 1 and the graph of a relation of electric current;
Fig. 3 is the schematic diagram of the utility model adaptive power conversion controller one preferred embodiment;
Fig. 4 is the schematic diagram of adaptive voltage sensing cell one preferred embodiment of Fig. 3;
Fig. 5 is the schematic diagram of another embodiment of the utility model adaptive power conversion controller;
Fig. 6 shows the voltage of the utility model output that adaptive power conversion controller is controlled and the graph of a relation of electric current;
Fig. 7 A and Fig. 7 B are the schematic diagram of the utility model adaptive constant voltage control circuit one preferred embodiment.
[main element description of reference numerals]
Electric voltage constant and current constant transfer controller 10
Power-switching circuit 11
DC voltage level change-over circuit 151
Error amplifying circuit 152
Power-switching circuit 20
Adaptive power conversion controller 30
Adaptive voltage sensing cell 33
Error amplifying circuit 352
Adaptive constant voltage control circuit 40
Adaptive voltage sensing cell 43
Control unit 45
Error amplifying circuit 452
Voltage sense signal VOS
Current sensing signal VCS
The first reference voltage signal VR1
Current detecting reference signal VCI
The second reference voltage signal VR2
Error amplification signal VFB
Load current ILOAD
Load voltage VLOAD
Reference voltage signal VR
First resistance R 1
Second resistance R 2
The 3rd resistance R 3
The 4th resistance R 4
The output OUT of power-switching circuit
The earth terminal G of load
The input voltage VIN of power-switching circuit
The output voltage VO UT of power-switching circuit
The earth terminal voltage VSS_IN of power-switching circuit
The earth terminal voltage VSS of load
The input current IIN of power-switching circuit
Embodiment
Spirit of the present utility model is that sensing load voltage and load current are to produce voltage sense signal.By a comparative voltage sensing signal and a current sensing signal corresponding to load current, decision is according to current sensing signal or according to voltage sense signal control, to reach the switching of deciding Current Control and deciding voltage control function.In an embodiment of the present utility model, also can utilize the level of a level shifting circuit Come convergent-divergent, adjustment current sensing signal, decide the adjustment of Current Control point to reach adaptive constant voltage.Describe adaptive power conversion controller of the present utility model in detail below with reference to diagram.
Fig. 3 is the circuit diagram of adaptive power conversion controller one preferred embodiment of the present utility model.As shown in FIG., this adaptive power conversion controller 30 comprises an adaptive voltage sensing cell 33 and a conversion control circuit 35.Adaptive voltage sensing cell 33 is coupled to load 22, and exports a voltage sense signal VOS according to a load current ILOAD and the load voltage VLOAD from load 22.Aforementioned load voltage VLOAD is the cross-pressure at load 22 two ends, and load current ILOAD is the electric current of the load 22 of flowing through.
In the present embodiment, conversion control circuit 35 is directly by the current sensing signal VCS of adaptive voltage sensing cell 33 acquisitions corresponding to load current ILOAD.Conversion control circuit 35 is exported at least one error amplification signal VFB according to voltage sense signal VOS, the current sensing signal VCS and the reference voltage signal VR that are received.Wherein, when the level of current sensing signal VCS during greater than the level of voltage sense signal VOS, conversion control circuit 35 is according to current sensing signal VCS and reference voltage signal VR output error amplifying signal VFB.When the level of current sensing signal VCS during less than the level of voltage sense signal VOS, conversion control circuit 35 is according to voltage sense signal VOS and reference voltage signal VR output error amplifying signal VFB.Whereby, can reach and decide the purpose that voltage is decided current conversion.
Secondly, in the present embodiment, conversion control circuit 35 has a level shifting circuit 351 and an error is amplified electricity 352.Level shifting circuit 351 received current sensing signal VCS after the DC voltage level conversion, export a current detecting reference signal VCI.By the level of level shifting circuit 351 change current sensing signal VCS, can adjust and decide the control point that voltage is decided electric current.
The circuit diagram of adaptive voltage sensing cell 33 1 embodiment of Fig. 4 displayed map 3.As shown in FIG., adaptive voltage sensing cell 33 has one first resistance R 1, one second resistance R 2 and one the 3rd resistance R 3.These three resistance R 1, R2, R3 connect into a resistance string.One end of this resistance string is coupled to the output OUT of power-switching circuit 20, and the other end is coupled to the earth terminal G of load 22, and constitutes a circuit loop with load 22.The earth terminal G of load 22 is different with the earth terminal (not shown) of power-switching circuit 20.Voltage sense signal VOS be on second resistance R 2 and the 3rd resistance R 3 cross-pressure and.The contact of second resistance R 2 and the 3rd resistance R 3 is coupled to the earth terminal of the input voltage of power-switching circuit 20.Suitably adjust the input current of power-switching circuit 20 and the current circuit of output current, can make the input current IIN of power-switching circuit 20 or from the load current ILOAD of load the 3rd resistance R 3 of flowing through.
Under the input current IIN of power-switching circuit 20 flowed through the situation of the 3rd resistance R 3, current sensing signal VCS was the cross-pressure on the 3rd resistance R 3 of aforementioned adaptive voltage sensing cell 33.The cross-pressure of this 3rd resistance R 3 and load current ILOAD have a proportionate relationship.Its relational expression is:
The branch compression functions that utilizes this resistance string to have can make voltage sense signal VOS (VOS=VOSP-VOSN) and load voltage VLOAD and load current ILOAD produce certain pantograph ratio relation.Its relational expression is:
......(2)
Wherein, r1, r2, r3 is respectively the resistance value of first resistance R 1, second resistance R 2 and the 3rd resistance R 3, VIN is meant the input voltage of power-switching circuit 20, VOUT is meant the output voltage of power-switching circuit 20, and VSS_IN is meant the earth terminal voltage of power-switching circuit 20, and VSS is meant the earth terminal voltage of load 22.
Aforesaid equation (1) is the situation of carrying out step-down (buck) conversion at power-switching circuit 20 with equation (2).Can be found that by formula voltage sense signal VOS is the function of load voltage VLOAD and load current ILOAD, current sensing signal VCS is the function of load current ILOAD.This functional relation is still set up under the situations such as (boost) conversion, buck (buck-boost) conversion of boosting.Therefore, notion of the present utility model is also applicable to the power transfer of other kinds, as boost conversion, buck conversion etc.
Under the load current ILOAD from load flowed through the situation of the 3rd resistance R 3, current sensing signal VCS was the cross-pressure on the 3rd resistance R 3 of aforementioned adaptive voltage sensing cell 33.The cross-pressure of this 3rd resistance R 3 and load current ILOAD have a proportionate relationship.Its relational expression is:
VCS＝r3×ILOAD......(3)
The branch compression functions that utilizes this resistance string to have can make voltage sense signal VOS (VOS=VOSP-VOSN) and load voltage VLOAD and load current ILOAD produce certain pantograph ratio relation.Its relational expression is:
Wherein, r1, r2, r3 are respectively the resistance values of first resistance R 1, second resistance R 2 and the 3rd resistance R 3.
Aforesaid equation (3) is the situation of carrying out step-down (buck) conversion at power-switching circuit 20 with equation (4).By finding in the formula that voltage sense signal VOS is the function of load voltage VLOAD and load current ILOAD, current sensing signal VCS is the function of load current ILOAD.This functional relation is still set up under the situations such as (boost) conversion, buck (buck-boost) conversion of boosting.Therefore, notion of the present utility model is also applicable to the power transfer of other kinds, as boost conversion, buck conversion etc.
Fig. 5 shows another preferred embodiment of adaptive power conversion controller 30 of the present utility model.Omit the part identical among the figure with adaptive power conversion controller shown in Figure 3 30.As shown in FIG., this adaptive power conversion controller 30 also has a current sensing unit 34 except adaptive voltage sensing cell 33.This current sensing unit 34 has one the 4th resistance R 4, is serially connected with 22 of the output OUT of power-switching circuit 20 and loads.That is to say that load current ILOAD is the load 22 of flowing through again behind the current sensing circuit 34 of flowing through earlier.Current sensing signal VCS i.e. the cross-pressure of the 4th resistance R 4 for this reason.The relational expression of current sensing signal VCS and load current ILOAD is: VCS=r4 * ILOAD.Wherein, r4 is meant the resistance value of the 4th resistance R 4.In the side circuit configuration, but the process range that surpasses conversion control circuit 35 for fear of the level of current sensing signal VCS, can also adopt electric current to flow through earlier to flow through again after the load 22 series relationship of current sensing circuit 34, just current sensing unit 34 is serially connected with between load 22 and the earth terminal G to ground.
Fig. 6 shows that utilize adaptive power conversion controller 30 of the present utility model to carry out deciding voltage decides the voltage that current conversion exports and the graph of a relation of electric current.Since adaptive power conversion controller of the present utility model 30 by sensing load voltage and load current with generation voltage sense signal VOS.Therefore, deciding under the voltage control, voltage sense signal VOS can be compensated because of the rising of load current ILOAD.At this moment, the error amplification signal VFB that exported of error amplifying circuit 352 then can be inclined to and improve output voltage VO UT.Thereby can overcome shown in Figure 2ly, and to decide near the Current Control point deciding voltage, the voltage stabilized voltage characteristic of deciding voltage feedback control can be subjected to deciding the problem of the interference of current feedback control.In addition, as shown in Figure 3, in practical application, power-switching circuit 20 is to supply power to load 22 by a cable.Please be simultaneously with reference to Fig. 4, the 3rd resistance R 3 is coupled between the earth terminal (not shown) of the earth terminal G of load 22 and power-switching circuit 20, and the resistance value of the 3rd resistance R 3 and the resistance value of cable can have a proportionate relationship.Adjust the resistance value of the 3rd resistance R 3 in response to the resistance value of cable, can compensate that fax is passed in the process because the pressure drop that cable causes, so that load voltage accurately to be provided.
Fig. 7 A and Fig. 7 B are the schematic diagram of the utility model adaptive constant voltage control circuit 40 1 preferred embodiments.As shown in FIG., this adaptive constant voltage control circuit 40 is coupled to a power-switching circuit 20.The output OUT of this power-switching circuit 20 is coupled to a load 22.This adaptive constant voltage control circuit 40 has an adaptive voltage sensing cell 43 and a control unit 45.Wherein, adaptive voltage sensing cell 43 is coupled to load 22, and, use feedback and control power-switching circuit 20 voltage level to load 22 (being the level of the output voltage VO UT of power-switching circuit 20) is provided according to exporting a voltage sense signal VOS from a load current ILOAD and a load voltage VLOAD of load 22.Control unit 45 has an error amplifying circuit 452.This control unit 45 receives a voltage sense signal VOS and a reference voltage signal VR, and exports at least one error amplification signal VFB to power-switching circuit 20 according to voltage sense signal VOS and reference voltage signal VR.
But; the above; it only is preferred embodiment of the present utility model; can not limit the claim protection range that the utility model is implemented with this; be that all simple equivalent of being done according to the utility model claim and utility model description change and modification, all still belong in the claim scope of the present utility model.Arbitrary embodiment of the present utility model in addition or claim must not reach whole purposes or advantage or the characteristics that the utility model discloses.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting claim scope of the present utility model.
Claims (16)
1. an adaptive power conversion controller is characterized in that, is coupled to a load and a power-switching circuit, and this adaptive power conversion controller comprises:
One adaptive voltage sensing cell is according to exporting a voltage sense signal from a load current and a load voltage of this load; And
One conversion control circuit, receive this voltage sense signal, by relatively this voltage sense signal and a current sensing signal corresponding to this load current, control this power-switching circuit with decision according to this current sensing signal or this voltage sense signal and provide electrical power to this load.
2. adaptive power conversion controller as claimed in claim 1, it is characterized in that, this adaptive voltage sensing cell comprises one first resistance, one second resistance and one the 3rd resistance, this first resistance, this second resistance and the 3rd resistance constitute a resistance string, this resistance string and this load constitute a circuit loop, one end of this first resistance is electrically connected to an output of this power-switching circuit, the other end is electrically connected this second resistance, the contact of this second resistance and the 3rd resistance is connected to an earth terminal of this power-switching circuit, and the 3rd resistance is connected to an earth terminal of this load.
3. adaptive power conversion controller as claimed in claim 2 is characterized in that, this voltage sense signal equal this second resistance and the 3rd resistance cross-pressure and, this current sensing signal equals the cross-pressure of the 3rd resistance.
4. adaptive power conversion controller as claimed in claim 3 is characterized in that, the cross-pressure of the 3rd resistance and this load current have a proportionate relationship.
5. adaptive power conversion controller as claimed in claim 1, it is characterized in that, this conversion control circuit has a level shifting circuit, adjust the level of this current sensing signal, and, the level of more adjusted this current sensing signal of this conversion control circuit and the level of this voltage sense signal are to export an error amplification signal.
6. an adaptive constant voltage control circuit is characterized in that, is coupled to a power-switching circuit, and an output of this power-switching circuit is coupled to a load, and this adaptive constant voltage control circuit comprises:
One adaptive voltage sensing cell, this adaptive voltage sensing cell is coupled to this load, and according to exporting a voltage sense signal from a load current and a load voltage of this load; And
One control unit receives this voltage sense signal and a reference voltage signal, and controls the electric power output of this power-switching circuit according to this voltage sense signal and this reference voltage signal.
7. adaptive constant voltage control circuit as claimed in claim 6, it is characterized in that, this adaptive voltage sensing cell has one first resistance, one second resistance and one the 3rd resistance, be concatenated into a resistance string, the two ends of this resistance string are connected to this output of this power-switching circuit and an earth terminal of this load respectively, this voltage sense signal corresponding to the cross-pressure of this second resistance and the 3rd resistance and, and the contact of this second resistance and the 3rd resistance is connected to an earth terminal of this power-switching circuit.
8. adaptive constant voltage control circuit as claimed in claim 7 is characterized in that, the cross-pressure of the 3rd resistance and this load current have a proportionate relationship.
9. an adaptive power conversion controller is characterized in that, is coupled to a load and a power-switching circuit, and this adaptive power conversion controller comprises:
One adaptive voltage sensing cell, according to an input current of this power-switching circuit with export a voltage sense signal from a load voltage of this load; And
One conversion control circuit, receive this voltage sense signal, by relatively this voltage sense signal and a current sensing signal corresponding to this input current, control this power-switching circuit with decision according to this current sensing signal or this voltage sense signal and provide electrical power to this load.
10. adaptive power conversion controller as claimed in claim 9, it is characterized in that, this adaptive voltage sensing cell comprises one first resistance, one second resistance and one the 3rd resistance, this first resistance, this second resistance and the 3rd resistance constitute a resistance string, the two ends of this resistance string are connected to an output of this power-switching circuit and an earth terminal of this load respectively, one end of this first resistance is electrically connected to this output of this power-switching circuit, the other end is electrically connected this second resistance, the contact of this second resistance and the 3rd resistance is connected to the earth terminal of an input voltage of this power-switching circuit, this input current the 3rd resistance of flowing through.
11. adaptive power conversion controller as claimed in claim 10 is characterized in that, this voltage sense signal equal this second resistance and the 3rd resistance cross-pressure and, this current sensing signal equals the cross-pressure of the 3rd resistance.
12. adaptive power conversion controller as claimed in claim 11 is characterized in that, the cross-pressure of the 3rd resistance with have a proportionate relationship from a load current of this load.
13. adaptive power conversion controller as described in the claim 9, it is characterized in that, this conversion control circuit has a level shifting circuit, adjust the level of this current sensing signal, and, the level of more adjusted this current sensing signal of this conversion control circuit and the level of this voltage sense signal are to export an error amplification signal.
14. an adaptive constant voltage control circuit is characterized in that, is coupled to a power-switching circuit, an output of this power-switching circuit is coupled to a load, and this adaptive constant voltage control circuit comprises:
One adaptive voltage sensing cell, this adaptive voltage sensing cell is coupled to this load, and according to an input current of this power-switching circuit with export a voltage sense signal from a load voltage of this load; And
One control unit receives this voltage sense signal and a reference voltage signal, and controls the electric power output of this power-switching circuit according to this voltage sense signal and this reference voltage signal.
15. adaptive constant voltage control circuit as claimed in claim 14, it is characterized in that, this adaptive voltage sensing cell has one first resistance, one second resistance and one the 3rd resistance, be concatenated into a resistance string, the two ends of this resistance string are connected to this output of this power-switching circuit and an earth terminal of this load respectively, this voltage sense signal corresponding to the cross-pressure of this second resistance and the 3rd resistance and, the contact of this second resistance and the 3rd resistance is connected to the earth terminal of an input voltage of this power-switching circuit, this input current the 3rd resistance of flowing through.
16. adaptive constant voltage control circuit as claimed in claim 15 is characterized in that, the cross-pressure of the 3rd resistance with have a proportionate relationship from a load current of this load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009202188772U CN201523322U (en) | 2009-03-23 | 2009-09-30 | Adaptive constant voltage control circuit and adaptive power conversion controller |
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| CN200910128477.7 | 2009-03-23 | ||
| CN2009202188772U CN201523322U (en) | 2009-03-23 | 2009-09-30 | Adaptive constant voltage control circuit and adaptive power conversion controller |
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| CN201523322U true CN201523322U (en) | 2010-07-07 |
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Granted publication date: 20100707 Termination date: 20130930 |