CN101764416A - Power supply device with function of temperature compensation control - Google Patents
Power supply device with function of temperature compensation control Download PDFInfo
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- CN101764416A CN101764416A CN200810190231A CN200810190231A CN101764416A CN 101764416 A CN101764416 A CN 101764416A CN 200810190231 A CN200810190231 A CN 200810190231A CN 200810190231 A CN200810190231 A CN 200810190231A CN 101764416 A CN101764416 A CN 101764416A
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- output voltage
- compensation control
- power supply
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Abstract
The invention relates to a power supply device with the function of temperature compensation control, which is used for selectively supplying power to a load from an external power supply or a battery or charging the battery from the external power supply, and which comprises: a step-down switching circuit, electrically connected between the external power supply and the load; and a temperature compensation control circuit, controlling the operation of the step-down switching circuit in accordance with the sensed temperature, in order to regulate an output voltage of the step-down switching circuit.
Description
Technical field
The present invention relates to a kind of power supply device with function of temperature compensation control.
Background technology
See also Fig. 1, often need the dual power supply path in the electronic installation, when external power source exists, charge to load 2 power supplies and to battery BATT, when no external power source, load 2 is powered by battery BATT from external power source.In prior art shown in this figure, the feed lines of external power source is controlled by linear voltage change-over circuit 10, this linear voltage change-over circuit 10 for example is simple switching circuit or low pressure drop LDO (Low Drop-Out) circuit, it comprises transistor power switch P0, and LDO control circuit or the ON-OFF control circuit 11 of controlling this switch P 0; The path that external power source charges to battery BATT and battery BATT powers to load 2 is controlled by transistor power switch P1 then, and this switch P 1 is controlled by fixed current or fixed voltage (ConstantCurrent/Constant Voltage) dynamic control circuit 20.
In the above prior art, the details of LDO 10 and CC/CV dynamic control circuit 20 is known to those skilled in the art, and the Therefore, omited will not illustrate.
The shortcoming of Fig. 1 prior art is and since use the linear voltage conversion so, the pressure reduction between external power source and the battery causes heat dissipation problem, this problem or occur in power switch P0, or occur in power switch P1 must propose solution.
Summary of the invention
Because the shortcoming of prior art, one of the object of the invention is to overcome the deficiencies in the prior art and defective, proposes a kind of power supply device with function of temperature compensation control.
For reaching above-mentioned purpose, with regard to one of them viewpoint, the invention provides a kind of power supply device with function of temperature compensation control, in order to optionally to give load from external power source or powered battery, or certainly this external power source to this battery charge, this power supply device comprises: step-down switching circuit is electrically connected between this external power source and this load; And temperature compensation control circuit, control the operation of this step-down switching circuit according to sensing temperature, to adjust the output voltage of this step-down switching circuit.
In the better embodiment of foregoing circuit, this output voltage should be provided with high lower bound, and when sensing temperature was lower than a preset temperature, this output voltage allowed to be that height is limit; When sensing temperature was higher than this preset temperature, the highest feasible value personal comments thermometric degree of this output voltage and the temperature difference of preset temperature increased and descend gradually, but still are higher than set lower bound.
Below by specific embodiment is illustrated in detail, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 is the schematic circuit diagram of the power supply device with dual power supply path of prior art;
Fig. 2 shows one of them embodiment of the present invention with schematic circuit diagram;
Fig. 3 illustrates the relation of temperature and output voltage among the present invention;
Fig. 4 is a schematic circuit diagram, and the execution mode of the high lower bound initialization circuit of temperature sensing circuit and output voltage is shown for example;
Fig. 5 illustrates how to control step-down switching circuit according to the output of temperature compensation control circuit and overcurrent protective circuit for example;
Fig. 6,7 illustrates two embodiment of overcurrent protective circuit for example.
Symbol description among the figure
2 loads
20 CC/CV dynamic control circuit
30 step-down switching circuit
301,302 power switchs
303 inductance
304 logical circuits
305 drive lock
40 temperature compensation control circuits
41 temperature sensing circuits
411 operational amplifiers
412 transistors
The high lower bound initialization circuit of 42 output voltages
421 comparators
50 overcurrent protective circuits
The BATT battery
The I1 current source
The P1 power transistor
R1, R2, R3 resistance
The V1 node
The Vout output voltage
The Vref reference voltage
Embodiment
See also Fig. 2, wherein the mode with schematic circuit diagram shows one of them embodiment of the present invention.The present invention uses step-down switching circuit 30 to replace linear voltage change-over circuit 10 of the prior art, and the energy operation efficiency of step-down switching circuit 30 is preferable, is difficult for causing heat dissipation problem; And step-down switching circuit 30 is more accepted function of temperature compensation control, with the temperature of further control circuit.
In detail, power supply device of the present invention comprises two supply paths, and article one supply path is connected between external power source and the output voltage node Vout to load 2, is controlled by step-down switching circuit 30; The second supply path is connected between output voltage node Vout and the battery BATT.Step-down switching circuit 30 is controlled by temperature compensation control circuit 40, and this temperature compensation control circuit 40 comprises temperature sensing circuit 41 and the high lower bound initialization circuit 42 of output voltage.Temperature sensing circuit 41 sensing circuit temperature when circuit temperature is too high, downgrade output voltage V out, to reduce the temperature of circuit.The high lower bound initialization circuit 42 of output voltage is set upper limit VH and the lower limit VL of output voltage V out.The effect that the high lower bound initialization circuit 42 of temperature sensing circuit 41 and output voltage is reached sees also Fig. 3: when sensing temperature was lower than design temperature T, output voltage V out allowed for high limit VH, allows electric power so that load 2 and battery BATT can obtain maximum.When sensing temperature was equal to or greater than design temperature T, the highest feasible value of output voltage V out descended gradually, to reduce circuit temperature.Even but when sensing temperature during much larger than design temperature T, output voltage V out still can not be lower than lower bound VL, so that load 2 can obtain required substantially electric power.
In addition, in the present embodiment, optionally additional overcurrent protective circuit 50; The effect of overcurrent protective circuit 50 is that the electric current on control article one supply path is unlikely above a certain default safe range.
The detailed execution mode of temperature compensation control circuit 40 is lifted an example and is seen also Fig. 4.Comprise operational amplifier 411 and transistor 412 in the temperature sensing circuit 41, the gate of the output control transistor 412 of operational amplifier 411.On behalf of the signal of sensing temperature, operational amplifier 411 will compare with the signal of representing design temperature T, according to the conducting degree of comparative result oxide-semiconductor control transistors 412, and decision electric current I 1.Comprise current source I2, resistance R 1 and comparator 421 in the high lower bound initialization circuit 42 of output voltage, wherein the product of electric current I 2 and resistance R1 promptly equals the high limit of output voltage VH.When sensing temperature was lower than design temperature T, operational amplifier 411 oxide-semiconductor control transistors 412 made it close not conducting, and I1 is zero, so the voltage of node V1 promptly equals I2 * R1, that is VH.When sensing temperature was higher than design temperature T, the conducting degree of transistor 412 increased with temperature spread, and this moment, the voltage of node V1 equaled (I2-I1) * R1.Comparator 421 is chosen the higher person and output voltage V out comparison in cell voltage VBATT, lower bound VL and three positive input terminals of node voltage V1, when comparative result shows that negative input end (output voltage V out) is low, promptly exports the signal Pon of high levels.
When overcurrent protective circuit 50 being set and implementing temperature compensation control circuit 40 in Fig. 4 mode, integrated circuit for example can be as follows to the powered operation of load:
At first, when overcurrent protection did not start, far below design temperature T, then output voltage V out equaled high limit VH as temperature.When temperature rise to surpass but still during near temperature T, the highest feasible value of output voltage V out descends, the pressure reduction of output voltage V out and battery BATT is reduced,, so can make temperature decline and finally be equilibrated at temperature T so the consumed power of power transistor P1 descends.When temperature far surpasses temperature T, be higher than lower bound VL as cell voltage VBATT, then the highest feasible value of output voltage V out is VBATT, the pressure reduction that makes output voltage V out and battery BATT is zero, so the consumed power of power transistor P1 is zero; But be lower than lower bound VL as cell voltage VBATT, then output voltage V out still is maintained at lower bound VL, makes load 2 can obtain required substantially electric power.
Secondly; when load current and excessive to the electric current demand summation of battery BATT charging; so that when starting overcurrent protection; because of the input current * input voltage of step-down switching circuit 30 approximates its output current * output voltage; when the limited and output current of input current increases; output voltage V out will descend naturally, makes power transistor P 1 enter the saturation region, to the charging current of battery BATT also with descending.If load current demand is higher than the overcurrent set point, then circuit more will stop battery charge, and by external power source and battery BATT jointly to load 2 supply of current.
When no overcurrent protective circuit 50; the output signal Pon of temperature compensation control circuit 40 can determine the switching time of power switch in the step-down switching circuit 30 separately; when if overcurrent protective circuit 50 is set; its detailed execution mode; lift an example and see also Fig. 5; comprise up and down bridge power switch 301,302 and inductance 303 in the step-down switching circuit 30, the input voltage vin of left end is converted to the output voltage V out of right-hand member by the switching of bridge power switch 301,302 up and down.Bridge power switch 301,302 can be PMOS or nmos pass transistor respectively up and down, regards it as which kind of transistor, and its gate controlling signal may need anti-phase.The output signal Pon of temperature compensation control circuit 40 and the output signal OC of overcurrent protective circuit 50 are through after the logical operation of logical circuit 304, and its result is by driving lock 305 driving power switches 301.Suppose to go up bridge power switch 301 and be the PMOS transistor, when output signal OC is a low level, when the overcurrent situation does not take place in expression, by the ON time (because of power switch 301 is the PMOS transistor, logical circuit 304 is with the anti-phase output of signal Pon) of signal Pon decision power switch 301.When output signal OC is a high levels, when the overcurrent situation took place in expression, then logical circuit 304 output high levels were closed power switch 301.
Overcurrent protective circuit 50 has various execution modes, and Fig. 6 shows a wherein example, and the pressure reduction at resistance R 2 two ends can reflect the electric current by resistance R 2 in the present embodiment; This pressure reduction and the reference voltage Vref of presetting are compared, and promptly whether decidable the overcurrent situation takes place.Fig. 7 shows another example of overcurrent protective circuit 50; after its sensing is obtained electric current on article one supply path; make this electric current by resistance R 3, then cross-pressure on the resistance R 3 and the reference voltage Vref of presetting can be compared equally, to judge the overcurrent situation that whether takes place.
Below at preferred embodiment the present invention is described, just the above for making those skilled in the art be easy to understand content of the present invention, is not to be used for limiting interest field of the present invention only.Those skilled in the art are when thinking immediately and various equivalence variation in spirit of the present invention.For example, power switch 302 can use diode to replace; Again for example, direct-connected two elements shown in all embodiment can insert the circuit that does not influence major function betwixt; Again for example, among Fig. 4 embodiment, must not need all signals are compared in same comparator 421, and carry out logical operation again after can comparing in twos earlier, or the like.So all according to a notion of the present invention and spirit impartial for it a variation or modification, all should be included in the scope of claims of the present invention.
Claims (9)
1. power supply device with function of temperature compensation control, in order to optionally giving load from external power source or powered battery, or this external power source is characterized in that this battery charge certainly, this power supply device comprises:
Step-down switching circuit is electrically connected between this external power source and this load; And
Temperature compensation control circuit is controlled the operation of this step-down switching circuit according to sensing temperature, to adjust the output voltage of this step-down switching circuit.
2. the power supply device with function of temperature compensation control as claimed in claim 1, wherein, this output voltage is provided with high lower bound, and when sensing temperature was lower than a preset temperature, this output voltage allowed to be that height is limit; When sensing temperature was higher than this preset temperature, this output voltage did not allow to be that height is limit, but still is higher than lower bound.
3. the power supply device with function of temperature compensation control as claimed in claim 2, wherein, when sensing temperature was higher than this preset temperature, the highest feasible value personal comments thermometric degree of output voltage and the temperature difference of preset temperature increased and descend gradually.
4. the power supply device with function of temperature compensation control as claimed in claim 1, wherein, this temperature compensation control circuit comprises:
Temperature sensing circuit, on behalf of the signal of sensing temperature, it will compare with the signal of representing a preset temperature;
The high lower bound initialization circuit of output voltage, it sets the high lower bound of output voltage, and adjusts the highest feasible value of output voltage according to the temperature difference of sensing temperature and preset temperature.
5. the power supply device with function of temperature compensation control as claimed in claim 4, wherein, this temperature sensing circuit comprises an operational amplifier, and it is according to the signal of representing sensing temperature and represent the comparative result of the signal of preset temperature to control a transistor, produces first electric current; And wherein the high lower bound initialization circuit of this output voltage comprises a current source, produces second electric current by a resistance, and this ohmically cross-pressure changes with the difference of second electric current and first electric current.
6. the power supply device with function of temperature compensation control as claimed in claim 5, wherein, the high lower bound initialization circuit of this output voltage also comprises a comparator, will represent the signal of the output voltage of step-down switching circuit to compare with described ohmically cross-pressure.
7. the power supply device with function of temperature compensation control as claimed in claim 6, wherein, this comparator is a multi-input comparator, it comprises three positive input terminals, receive respectively and represent cell voltage, the described ohmically cross-pressure of representative, preset the signal of output voltage lower bound with representative, and a negative input end, the signal of the output voltage of step-down switching circuit is represented in reception, and this multi-input comparator is compared the positive input terminal peak with negative input end.
8. the power supply device with function of temperature compensation control as claimed in claim 1 wherein, also comprises the overcurrent protective circuit, makes the unlikely reception overcurrent of this step-down switching circuit in order to control.
9. the power supply device with function of temperature compensation control as claimed in claim 8, wherein, this step-down switching circuit comprises:
Be electrically connected on the last bridge power switch of same node, following bridge power switch and inductance mutually; And
Logical circuit; it receives the output signal of temperature compensation control circuit and overcurrent protective circuit; when the overcurrent situation does not take place in the output signal demonstration of excessive current protecting circuit; the bridge power switch is gone up in output signal control by temperature compensation control circuit; when the overcurrent situation takes place, then close and close the bridge power switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101902318A CN101764416B (en) | 2008-12-26 | 2008-12-26 | Power supply device with function of temperature compensation control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101902318A CN101764416B (en) | 2008-12-26 | 2008-12-26 | Power supply device with function of temperature compensation control |
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| Publication Number | Publication Date |
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| CN101764416A true CN101764416A (en) | 2010-06-30 |
| CN101764416B CN101764416B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101902318A Expired - Fee Related CN101764416B (en) | 2008-12-26 | 2008-12-26 | Power supply device with function of temperature compensation control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812341A (en) * | 2011-01-31 | 2014-05-21 | 立锜科技股份有限公司 | Adaptive temperature compensation circuit and method |
| CN109245252A (en) * | 2018-12-14 | 2019-01-18 | 湖南丰日电源电气股份有限公司 | The non-linear temperature compensation method of battery charging voltage |
| CN109921660A (en) * | 2018-09-11 | 2019-06-21 | 郝龙龙 | Electronic control transformer |
| CN114362734A (en) * | 2022-03-18 | 2022-04-15 | 成都市易冲半导体有限公司 | Substrate voltage dynamic selection method and circuit of ultra-low negative voltage resistant power signal switch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007306647A (en) * | 2006-05-09 | 2007-11-22 | Lenovo Singapore Pte Ltd | Power supply system and electronic equipment |
| CN101162845A (en) * | 2007-09-14 | 2008-04-16 | 东莞市翔龙能源科技有限公司 | Temperature control charge voltage regulating mechanism |
-
2008
- 2008-12-26 CN CN2008101902318A patent/CN101764416B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812341A (en) * | 2011-01-31 | 2014-05-21 | 立锜科技股份有限公司 | Adaptive temperature compensation circuit and method |
| CN103812341B (en) * | 2011-01-31 | 2016-06-08 | 立锜科技股份有限公司 | Adaptive temperature compensation circuit and method |
| CN109921660A (en) * | 2018-09-11 | 2019-06-21 | 郝龙龙 | Electronic control transformer |
| CN109245252A (en) * | 2018-12-14 | 2019-01-18 | 湖南丰日电源电气股份有限公司 | The non-linear temperature compensation method of battery charging voltage |
| CN114362734A (en) * | 2022-03-18 | 2022-04-15 | 成都市易冲半导体有限公司 | Substrate voltage dynamic selection method and circuit of ultra-low negative voltage resistant power signal switch |
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| Publication number | Publication date |
|---|---|
| CN101764416B (en) | 2012-07-04 |
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