CN101064470A - Output voltage control equipment for DC voltage/DC voltage converter - Google Patents
Output voltage control equipment for DC voltage/DC voltage converter Download PDFInfo
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- CN101064470A CN101064470A CN 200610026005 CN200610026005A CN101064470A CN 101064470 A CN101064470 A CN 101064470A CN 200610026005 CN200610026005 CN 200610026005 CN 200610026005 A CN200610026005 A CN 200610026005A CN 101064470 A CN101064470 A CN 101064470A
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Abstract
An output voltage control equipment of direct current voltage/direct current voltage (DC/DC) converter relates to output voltage control equipment of DC/DC converter input proper voltage from load direct current power source, it includes: current sensing part which is used to detect the load current; voltage sensing part which senses voltage output by the current sensing part; voltage compensating part which adjusts output of the current sensing part; plus part which gains the voltage above the output voltage value; oscillation part which outputs taper wave voltage; comparing part which compares the output value of the oscillation part and plus part; switch which adjusts current; switch control part which controls the operation of switch. The invention controls the period of switch, adjusts the output voltage which changes with the load current, the output voltage is set to minimum to output to the chip group, so electricity wasted in chip group is decreased, work efficiency of system power source is increased.
Description
Technical field
The present invention relates to the output voltage control appliance of direct voltage/direct voltage (hereinafter to be referred as DC/DC) transducer, is exactly the output voltage control appliance that relates to a kind of DC/DC transducer of input appropriate voltage from the load DC power supply to saying in more detail.
Background technology
Output voltage control appliance to the DC/DC transducer of foundation prior art is described in detail below.
Fig. 1 is the power supply flowage structure figure according to the electric power loop of prior art, and Fig. 2 is the change in voltage schematic diagram that takes place along with the variation of the load current of electric power loop.
Connect power supply in the loop, by DC/DC transducer 10 output DC power supplys.When the dc voltage of output is zero load is 3.3V.The voltage of above-mentioned 3.3V reduces pressure by the resistance that is installed on the power rail 90, and output voltage is reduced to 3.1V.Then 3.1V voltage is added on the chipset 80.
As shown in Figure 2, behind the power supply, voltage status changes along with the variation of load current in the connection loop.That is, the voltage of the input of DC/DC transducer is always exported with 3.3V as shown in the figure.But in fact, the voltage that is added on the chipset is to be attenuated to 3.1V's from 3.3V gradually.This is because the voltage of exporting from the DC/DC transducer is added to before the chipset, and the edge that exists the resistance composition on load is solid.Owing to have the resistance composition on the load, along with the increasing voltage of load current (A) reduces gradually.As shown in Figure 2, (A) is increasing for load current, and the output voltage on the DC/DC transducer (3.3V) is attenuated to 3.1V gradually.
Be described in detail at DC/DC transducer below the foundation prior art.
Fig. 3 is the DC/DC transducer schematic diagram of installing on the electric power loop according to prior art.As shown in Figure 3, after power supply is added on the DC/DC transducer 10, be added on the coil (L1) by switch 20, the power supply that adds charges in electric capacity (C2).If surpass the charging capacity of above-mentioned electric capacity, then will be added to the negative pole (-) of multiplier (-icator) 50 by the electric current of the 1st resistance (R1).Positive pole (+) at multiplier (-icator) adds the 1st reference voltage 60 on the other hand.50 pairs the 1st reference voltages of multiplier (-icator) 60 compare with the voltage that adds then, the value that obtains are input to the comparison terminal (-) of the 1st comparator 30.The noninverting terminal (+) of the 1st comparator 30 is connected with vibrator 40, and the value of exporting by vibrator 40 is added on the noninverting terminal (+).Then, the magnitude of voltage that 30 pairs of the 1st comparators are added in anti-phase terminal compares with the value that is added on the noninverting terminal, and output valve is delivered on the switch element 20.That is, surpass when being added in the voltage of noninverting terminal, transmit high signal to switch element 20 if be added in the voltage of the anti-phase terminal of the 1st comparator 30.Then, switch element 20 is carried out opening operation, and electric current flows into.
But irrelevant with load increase or minimizing in the DC/DC of foundation prior art transducer, the voltage of output always remains on 3.3V.That is, irrelevant in the DC/DC transducer with the increase and the minimizing of electric current, always export fixing voltage.For example: the output voltage that is provided with of DC/DC transducer is 3.3V, though the load step-down of DC/DC converter inside then can be exported the voltage of 3.1V, still exports the voltage of 3.3V.
Though therefore the DC/DC transducer can be exported the voltage of 3.1V, the voltage of output is 3.3V, so even reduced voltage by power supply, the voltage that is added on the chip-scale also is high voltage (more than the 3.1V).
After the output voltage that the DC/DC transducer is set is 3.1V, the output voltage of 3.1V is reduced pressure by power rail, be input on the chipset.If the voltage ratio 3.1V of chipset input is low, then owing to be lower than the scope of input voltage, operation can go wrong.
And above-mentioned DC/DC transducer exists following problem.
DC/DC transducer according to prior art, how many voltage loads no matter dc power converter is exported is, all export fixing voltage, when if (load) is little so load, the voltage that the chipset of power supply (load) is gone up actual input can surpass the high voltage that needs, and causes electric quantity consumption too much.
That is, input voltage is little under big load (load) state, and under little load (light load) state, the input voltage height is so the change of the electric quantity consumption of chipset (load) is many.
Summary of the invention
The present invention proposes for addressing the above problem just, the purpose of this invention is to provide a kind of output voltage control appliance that the output voltage of the DC/DC transducer of electric power loop is carried out the DC/DC transducer of variable control according to load.
To achieve these goals, constitute by following components according to DC/DC converter output voltage control appliance of the present invention: if connect with the mains, the electric current sense part that load current is measured; Perception is from the voltage sense part of electric current sense part output; Adjusting is from the voltage compensation portion of electric current sense part output; Magnitude of voltage to the output of voltage sense part and voltage compensation portion compares, with voltage gain to the gain portion more than the output voltage values; With the vibration section of comparative voltage with the form output of conical wave; The comparing section that the output valve that is input to vibration section and gain portion is compared; Adjusting has the switch of no current flows; Switch control part of controlling based on the signal of comparing section transmission with to switching manipulation etc.
The invention is characterized in that if after the value of input compared, improve the value of importing by noninverting terminal again, the output valve of voltage compensation portion also will increase.
To achieve these goals, constitute by following components according to DC/DC converter output voltage control appliance of the present invention: the switch element that electric current is carried out on-off control; Be connected the load resistance that load current is changed along with the increase or reduce of load with switch element; Receive magnitude of voltage from the load resistance I/O, the output voltage control part that voltage is adjusted; Be connected with the load output, the distribution resistance value of the 4th resistance and the 5th resistance is input to anti-phase terminal, the voltage of output voltage control part input is input to the multiplier (-icator) that the non-oppisite phase end period of the day from 11 p.m. to 1 a.m gains to the value of input; The signal of multiplier (-icator) output is input to anti-phase terminal, the conical wave of bobbing machine output is input to after the non-oppisite phase end period of the day from 11 p.m. to 1 a.m compares two signals the comparator of output switch control signal etc.
Effect of the present invention:
The output voltage control appliance of DC/DC transducer of the present invention is for the DC voltage converter power supply, output voltage is set to minimum voltage, by output voltage to the load increase the time, the reduction of the voltage that causes owing to the existence of resistance compensates, assurance is imported minimum voltage to chipset, thereby the electric power that consumes in the minimizing chipset, the operating efficiency of raising system power supply.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the power supply flowage structure figure according to the electric power loop of prior art;
Fig. 2 is the change in voltage schematic diagram that takes place along with the variation of the load current of electric power loop;
Fig. 3 is the DC/DC transducer schematic diagram of installing on the electric power loop according to prior art;
Fig. 4 is according to the DC/DC transducer schematic diagram of installing on the electric power loop of the present invention;
Fig. 5 is the variation of the load current along with electric power loop of the present invention and the change in voltage schematic diagram that takes place;
Fig. 6 is the flow chart of the embodiment of electric power loop of the present invention.
The symbol description of major part in the accompanying drawing:
100:DC/DC transducer 110: switch element
120: reference voltage value 130: comparator
140: vibrator 150: multiplier (-icator)
160: output voltage control part 200:DC/DC transducer 210: switch portion
220: switch control part 230: comparator portion
240: electric current sense part 250: voltage compensation portion
260: voltage sense part 270: comparing section
280: vibrator
Embodiment
Output voltage control appliance to DC/DC transducer of the present invention describes with reference to the accompanying drawings.
The output of DC/DC transducer of the present invention can change along with the variation of load, only imports the minimum voltage that load (chip) needs, thereby makes the electric quantity consumption of chipset of the present invention reach minimum.
The voltage of chipset input is to reduce by the output of dc voltage changer and the load resistance between the chip (Io) (drop) voltage of voltage levvl, so need return reducing the voltage compensation (drop), to the fixing minimum voltage of chipset input.
For example, be 3.1V if use the minimum voltage of the chipset of 3.3V power supply, then be set to 3.1V at the starting stage output voltage, when load increases, when voltage reduces, voltage is compensated, increase output voltage, guaranteeing always provides minimum voltage to chipset.
Fig. 4 is according to the DC/DC transducer schematic diagram of installing on the electric power loop of the present invention.At first the connection situation to the control element of Fig. 4 describes, and switch element 110 is installed on the DC/DC transducer, and switch element 110 is connected in series with coil.Coil 11 and the 3rd resistance (R3) are connected in series, and the opposite side of coil (L1) is connected with lead-out terminal.This is the 3rd resistance (R3) perception load current (Io).And between switch element 110 and coil (L1), be connected with the negative electrode of diode (D1), the plus earth of diode (D1).And coil (L1) and the 3rd resistance (load resistance) are connected the opposite side ground connection of the 1st electric capacity (C1) with a side of the 1st electric capacity (C1) between (R3).
And the pedestal end of switch element 110 is connected with the output of comparator 130, and the anti-phase terminal (-) of comparator 130 is connected with the output of multiplier (-icator) 150.The noninverting terminal (+) of comparator 130 is connected with vibrator 140.Vibrator 140 output conical waves.
On the other hand, be connected in series with the 1st resistance (R1) and the 2nd resistance (R2) on another power supply of output reference voltage, the distribution resistance of the 1st resistance (R1) and the 2nd resistance (R2) is connected with the non-oppisite phase end (-) of multiplier (-icator) 150 and the output of output voltage control part 160.The opposite side ground connection of the 2nd resistance (R2).
Form the 4th resistance (R4) and the 5th resistance (R5), the opposite side ground connection of the 5th resistance (R5) resistance between the anti-phase terminal (-) of multiplier (-icator) 150 and the 3rd resistance (R3).Distribution resistance between the 4th resistance (R4) and the 5th resistance (R5) is input on the anti-phase terminal (+) of multiplier (-icator) 150.
The noninverting terminal (+) of multiplier (-icator) 150 is connected with the output of output voltage control part 160.Anti-phase terminal (-) in the output voltage control part 160 is input to the input of load resistance, and noninverting terminal (+) is input to the output of load resistance.
If add alternating current on DC/DC transducer 100, electric current is added on the switch element 110 in the DC/DC transducer 100, is delivered to the 3rd resistance (R3) by the coil (L1) that is connected with switch element 110.The 3rd resistance (R3) is carried out the function of perception load current.
Voltage and the mobile of electric current to control loop describes below.
DC/DC transducer 100 of the present invention is when zero load, the voltage of the 1st resistance (R1) and the 2nd resistance (R2) is set to minimum voltage when initial, and along with the increase of load, voltage reduces, for the voltage that reduces is compensated, (R3) detects load current by the 3rd resistance.
Detected load current is input to the noninverting terminal (+) of output voltage control part 160, and the value that the value that will import by noninverting terminal (+) is imported by the anti-phase terminal (-) of output voltage control part 160 compares dateout then.For example, add load current after, the voltage at the 3rd resistance (R3) two ends of perception load current rises, if the magnitude of voltage of perception rising in the 3rd resistance (R3), the output of output voltage control part 160 is also risen.
The value of output voltage control part 160 outputs is input to the noninverting terminal (+) of multiplier (-icator) 150 by the distribution resistance of the 1st resistance (R1) and the 2nd resistance (R2).On the other hand, the input of the anti-phase terminal (-) of multiplier (-icator) 150 is by the distribution resistance of the 4th resistance (R4) and the 5th resistance (R5) perception.The value of 150 pairs of inputs of multiplier (-icator) compares then, and output valve is adjusted.The magnitude of voltage of the last input of multiplier (-icator) 150 noninverting terminals (+) at this moment changes by output voltage control part 160.So the magnitude of voltage of multiplier (-icator) 150 outputs output can change.For example the output of output voltage control part 160 is risen, and then the level of the value by multiplier (-icator) 150 outputs also rises.
Be input to the anti-phase terminal (-) of comparator 130 by the value of multiplier (-icator) 150 outputs.Noninverting terminal (+) input of comparator 130 is from the conical wave of vibrator 140 outputs.130 pairs of comparators compare by the value of anti-phase terminal (-) input and the conical wave of importing by bobbing machine 140 noninverting terminals (+), fix the switching time of switch element 110 then.
Fig. 5 is the variation of the load current along with electric power loop of the present invention and the change in voltage schematic diagram that takes place.
Situation about increasing along with the variation output voltage of loading among the present invention is as follows.The voltage of exporting along with the variation of load is as shown in the figure
Busy hour output voltage (V2)-zero load is output voltage (V1)
Io
(Io is load current (A))
Among the present invention output voltage control part 160 and the 1st resistance (R1) and the 2nd resistance (R2) is set at the value in the formula.
That is, along with the increase of load, because the voltage decline that exists resistance to cause, for the value (load current (Io) * resistance value) that compensates the voltage that reduces improves output voltage.The actual output voltage of DC/DC transducer 100 for example changes between 3.1V-3.2V like this, and the actual input voltage of chip is fixed on the 3.1V, provides fixing minimum voltage to load.
The voltage of DC/DC transducer 100 outputs is along with load changes.For example the voltage of load input is because the load current (Io) of DC/DC transducer 100 resistance can decline.So because the decline of the voltage that load current (Io) causes improves output, guaranteeing provides constant minimum voltage to chipset in order to compensate back.For example, use the minimum voltage of the chipset of 3.3V power supply to be 3.1V, then be set to 3.1V at the starting stage output voltage, when load increases voltage decline, improve output voltage, the part that compensation descends rises to 3.1V.For this reason, DC/DC transducer 100, and comes out along with voltage is changed in the variation of load by the switchgear 110 in the loop.Like this, if load increases, then load current (Io) increases, and improves output voltage; If load reduces, then load current (Io) reduces, and reduces output voltage.Provide the constant minimum voltage that sets (more than the 3.1V) to chipset then.
Fig. 6 is the flow chart of the embodiment of electric power loop of the present invention.
For the magnitude of voltage that guarantees to import in the chip, the DC/DC transducer is carried out following operation.
At power input power supply is connected with DC/DC transducer 200, the magnitude of voltage of exporting in the DC/DC transducer 200 is passed to load 400.The switch portion 210 that is connected with power input is arranged in DC/DC transducer 200, and switch portion 210 transmits electric current to electric current sense part 240.The output of electric current sense part 240 is connected with load 400.
On the other hand, electric current sense part 240 is connected with voltage compensation portion 250, and the output of electric current sense part 240 is connected with voltage sense part 260.Voltage sense part 260 is sent to gain portion 270 with the value of voltage compensation portion 250 outputs.
Operation control procedure to the DC/DC converter inside describes below.
Shown in DC/DC transducer 200 built-in function flow charts, electric current is sent to electric current sense part 240 by switch 210 after being input to DC/DC transducer 200 inside.
240 pairs of electric currents that add of electric current sense part are measured, and measured value is sent to voltage compensation portion 250.On the other hand, voltage sense part 260 is connected with the output of electric current sense part 240, by the magnitude of voltage of electric current sense part 240 perception output.
Then, will be input to gain portion 270 from the value of electric current sense part 240 and 260 outputs of voltage sense part.The value of 270 pairs of inputs of gain portion gains, and outputs on the comparator 230.On the other hand, the vibration section 280 of generation conical wave is connected with comparing section 230.The conical wave of the value of 230 pairs of gain portions of comparing section, 270 inputs and vibration section 280 inputs compares, and output signal is sent to switch control part 220.
On the other hand, switch 210 prolongs the shut-in time of switch, reduces the output voltage of DC/DC transducer 200 outputs.
As mentioned above, basic thought of the present invention is along with the increase of load or reduces the switching of the switch in the DC/DC transducer is controlled, thereby output voltage is regulated.
By above-mentioned explanation, the person skilled in the art can carry out various change, modification, replacement or additional.But, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (3)
1, a kind of output voltage control appliance of direct voltage/dc voltage changer is characterized in that, is made of following components:
Connect with the mains the electric current sense part that load current is measured;
Perception is from the voltage sense part of described electric current sense part output;
Adjusting is from the voltage compensation portion of described electric current sense part output;
Magnitude of voltage to the output of described voltage sense part and voltage compensation portion compares, with voltage gain to the gain portion more than the output voltage values;
With the vibration section of described comparative voltage with the form output of conical wave;
The comparing section that the output valve that is input to described vibration section and gain portion is compared;
Adjusting has the switch of no current flows;
Based on the signal of described comparing section transmission and the switch control part that described switching manipulation is controlled.
2, direct voltage as claimed in claim 1/dc voltage changer output voltage control appliance is characterized in that:
If after the value of input compared, improve the value of importing by noninverting terminal again, the output valve of described voltage compensation portion also will increase.
3, a kind of output voltage control appliance of direct voltage/dc voltage changer is characterized in that, is made of following components:
Electric current is carried out the switch element of on-off control;
Be connected the load resistance (R3) that load current is changed along with the increase or reduce of load with switch element;
Receive magnitude of voltage from load resistance (R3) I/O, the output voltage control part that voltage is adjusted;
Be connected with the load output, the distribution resistance value of the 4th resistance (R4) and the 5th resistance (R5) is input to anti-phase terminal, the voltage of described output voltage control part input is input to the multiplier (-icator) that the non-oppisite phase end period of the day from 11 p.m. to 1 a.m gains to the value of input;
The signal of described multiplier (-icator) output is input to anti-phase terminal, the conical wave of bobbing machine output is input to after the non-oppisite phase end period of the day from 11 p.m. to 1 a.m compares two signals the comparator of output switch control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610026005 CN101064470A (en) | 2006-04-25 | 2006-04-25 | Output voltage control equipment for DC voltage/DC voltage converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610026005 CN101064470A (en) | 2006-04-25 | 2006-04-25 | Output voltage control equipment for DC voltage/DC voltage converter |
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| CN101064470A true CN101064470A (en) | 2007-10-31 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101714817B (en) * | 2009-12-09 | 2012-12-12 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN102957321A (en) * | 2011-08-24 | 2013-03-06 | 富士通半导体股份有限公司 | Control circuit, power supply device, and method of controlling power supply |
| CN103280864A (en) * | 2013-06-09 | 2013-09-04 | 四川品胜电子有限公司 | Portable movable power supply for automatically switching output currents and implementation method of portable movable power supply |
| CN103812330A (en) * | 2012-11-06 | 2014-05-21 | 泰商泰达电子公司 | Power supply converter capable of dynamically adjusting output voltage and power supply system suitable therefor |
| CN107508461A (en) * | 2017-07-18 | 2017-12-22 | 深圳市华星光电半导体显示技术有限公司 | DC voltage converting circuit and liquid crystal display device |
| CN108809088A (en) * | 2018-06-06 | 2018-11-13 | 深圳市华星光电半导体显示技术有限公司 | DC voltage booster circuit and DC boosting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101714817B (en) * | 2009-12-09 | 2012-12-12 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN102957321A (en) * | 2011-08-24 | 2013-03-06 | 富士通半导体股份有限公司 | Control circuit, power supply device, and method of controlling power supply |
| US9083238B2 (en) | 2011-08-24 | 2015-07-14 | Socionext Inc. | Control circuit, power supply device, and method of controlling power supply |
| CN102957321B (en) * | 2011-08-24 | 2016-01-20 | 株式会社索思未来 | The method of control circuit, supply unit and control power supply |
| CN103812330B (en) * | 2012-11-06 | 2017-09-12 | 泰商泰达电子公司 | It is dynamically adapted the power supply changeover device and its applicable electric power system of output voltage |
| CN103812330A (en) * | 2012-11-06 | 2014-05-21 | 泰商泰达电子公司 | Power supply converter capable of dynamically adjusting output voltage and power supply system suitable therefor |
| CN103280864B (en) * | 2013-06-09 | 2016-03-23 | 四川品胜电子有限公司 | The Portable power source of automatic conversion output current and its implementation |
| CN103280864A (en) * | 2013-06-09 | 2013-09-04 | 四川品胜电子有限公司 | Portable movable power supply for automatically switching output currents and implementation method of portable movable power supply |
| CN107508461A (en) * | 2017-07-18 | 2017-12-22 | 深圳市华星光电半导体显示技术有限公司 | DC voltage converting circuit and liquid crystal display device |
| US10600374B2 (en) | 2017-07-18 | 2020-03-24 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | DC voltage conversion circuit and liquid crystal display device |
| CN108809088A (en) * | 2018-06-06 | 2018-11-13 | 深圳市华星光电半导体显示技术有限公司 | DC voltage booster circuit and DC boosting method |
| CN108809088B (en) * | 2018-06-06 | 2019-07-02 | 深圳市华星光电半导体显示技术有限公司 | DC voltage booster circuit and DC boosting method |
| WO2019232976A1 (en) * | 2018-06-06 | 2019-12-12 | 深圳市华星光电半导体显示技术有限公司 | Direct current voltage boost circuit and direct current voltage boost method |
| US11074857B2 (en) | 2018-06-06 | 2021-07-27 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | DC boost circuit and method |
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