CN205283395U - Power management circuit - Google Patents
Power management circuit Download PDFInfo
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- CN205283395U CN205283395U CN201521129386.2U CN201521129386U CN205283395U CN 205283395 U CN205283395 U CN 205283395U CN 201521129386 U CN201521129386 U CN 201521129386U CN 205283395 U CN205283395 U CN 205283395U
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Abstract
The utility model discloses a power management circuit, it includes that DC -DC converter, the poor voltage regulator of low pressure and reference voltage produce the circuit, the DC -DC converter includes feedback control circuit and power switching circuit. Power switching circuit includes first switch and second switch, and it switches on through first switch and second switch in turn, converts input voltage into output voltage VDC, the feedback control circuit includes the first output that links to each other with the control end of first switch and the second output that links to each other with the control end of second switch, and the feedback control circuit is based on output voltage VDC and reference voltage, through its first output drive signal, through the 2nd drive signal of its second output, the poor voltage regulator of low pressure is used for carrying out the poor regulation of low pressure to output voltage VDC to obtain output voltage vo, reference voltage produces the circuit and sums to an output voltage vo and a presupposition voltage, should sum voltage as reference voltage. Compared with the prior art, the utility model discloses can realize the system efficiency of the realization preferred of preferred.
Description
[technical field]
The utility model relates to circuit design field, particularly relates to a kind of electric power management circuit comprising DC-to-dc converter and low difference voltage regulator.
[background technology]
Along with portable electric appts function increases day by day, more and more circuit needs to optimize efficiency, otherwise the working hour can be limited, and overheated be also a serious problem. More and more circuit carrys out step-down by dc-dc (i.e. DC-to-dc converter), but some circuit is very responsive to power supply noise, if directly using the output of dc-dc will significantly reduce its performance.
Owing to the output ripple of usual dc-dc is about 10mV��50mV, therefore, after dc-dc, connect a LDO (i.e. low difference voltage regulator) again and can reduce voltage ripple. If the input and output voltage difference of LDO is more little, its efficiency is more high, but, during owing to producing in enormous quantities, there is difference in chip chamber, the minimum input and output voltage difference causing every chips to realize is different, (it is generally slow process corner: slowprocesscorner to meet worst condition, and Working environment temperature is higher), therefore, can the output voltage of dc-dc be adjusted to higher, but like this typical chip and fast process corner chip then be seemed waste, it does not have realize optimum efficiency.
Solve the problem therefore, it is necessary to propose a kind of new scheme.
[practical novel content]
One of the purpose of this utility model is to provide a kind of electric power management circuit, and it can realize preferably system efficiency.
For achieving the above object, according to an aspect of the present utility model, the utility model provides a kind of electric power management circuit, and it comprises dc-dc, low difference voltage regulator and generating circuit from reference voltage, and described dc-dc comprises feedback control circuit and Power convert circuit. Described Power convert circuit comprises the first power switch and the 2nd power switch, and input voltage, by the first power switch and the 2nd power switch alternate conduction, is converted to output voltage VDC by it; Described feedback control circuit comprises the first output terminal that the grid with the first power switch is connected and the 2nd output terminal being connected with the grid of the 2nd power switch, described feedback control circuit is based on output voltage VDC and reference voltage Vref, the first actuate signal is exported by its first output terminal, two driving signal is exported by its 2nd output terminal, described first actuate signal drives the first power switch conducting or shutoff, and described two driving signal drives the 2nd power switch conducting or shutoff; The input terminus of described low difference voltage regulator is connected with output voltage VDC, described low difference voltage regulator for output voltage VDC is carried out low pressure reduction adjustment, to obtain output voltage Vo; The output voltage Vo of low difference voltage regulator and a predeterminated voltage are sued for peace by described generating circuit from reference voltage, this sum voltages as the reference voltage Vref be supplied to dc-dc.
Further, described low difference voltage regulator comprises output tube and operational amplifier, described predeterminated voltage equal low difference voltage regulator when maximum output current the source and drain of output tube extremely on the maximum voltage drop that formed.
Further, described generating circuit from reference voltage comprises power tube, the first current source and voltage source, and the just end of described first current source is connected with input voltage, and its negative terminal is connected with the source electrode of power tube; The drain electrode of power tube is connected with described output voltage Vo, and the grid of power tube is connected with the positive pole of described voltage source; The negative pole ground connection of voltage source, the volts lost between the source electrode of power tube and drain electrode is described predeterminated voltage, and the voltage on connection node between the first current source and power tube is described reference voltage Vref.
Further, power tube and output tube are the MOS pipe of identical type, and the ratio of the breadth-length ratio of power tube is 1/K times of the ratio of the breadth-length ratio of output tube; The current value of the first current source be the maximum output current of low difference voltage regulator 1/K doubly, K be greater than 1 natural number, the magnitude of voltage of voltage source equals the minimum output voltage that operational amplifier in low difference voltage regulator is operated in saturation region.
Further, described low difference voltage regulator also comprises the 2nd current source, the source electrode of described output tube and being connected with described output voltage VDC, and its drain electrode is connected with the just end of the 2nd current source, the negativing ending grounding of the 2nd current source; Connection node between first input terminus of operational amplifier with output tube and the 2nd current source is connected, and its 2nd input terminus is connected with reference voltage Ref, and its output terminal is connected with the grid of output tube; The voltage of the connection node between output tube and the 2nd current source is output voltage Vo.
Further, the first input terminus of operational amplifier is positive input, and its 2nd input terminus is negative input; Output tube and power tube are PMOS transistor.
Further, described feedback control circuit comprises error amplifier, PWM comparer and driving circuit, first input terminus of described error amplifier is connected with described reference voltage Vref, its the 2nd input terminus is connected with described output voltage VDC, and its output terminal is connected with the first input terminus of described PWM comparer; 2nd input terminus of PWM comparer is connected with choppy sea signal Ramp, and the output terminal of PWM comparer is connected with the input terminus of driving circuit; First output terminal of driving circuit is connected with the grid of the first power switch, and its 2nd output terminal is connected with the grid of the 2nd power switch.
Further, the error that described error amplifier amplifies described reference voltage Vref and described output voltage VDC to obtain and exports error and amplifies voltage; Described PWM comparer is used for comparison reference signal and described error amplifies voltage with output pulse width modulation signal; Described driving circuit exports the first actuate signal and two driving signal NDRV based on described width modulation signal.
Further, described Power convert circuit comprises the first power switch, the 2nd power switch, inductance L 1 and electric capacity C1, the source electrode of described first power switch is connected with input voltage, and its drain electrode is connected with the drain electrode of the 2nd power switch, the source ground of the 2nd power switch; Connection node between first power switch and the 2nd power switch is successively through described inductance L 1 and electric capacity C1 ground connection, and the voltage of the connection node between inductance L 1 and electric capacity C1 is described output voltage VDC.
Further, the first input terminus of described error amplifier is positive input, and its 2nd input terminus is negative input; First input terminus of described PWM comparer is positive input, and its 2nd input terminus is negative input; Described first power switch is PMOS transistor, and the 2nd power switch is nmos pass transistor.
Compared with prior art, the utility model has set up generating circuit from reference voltage on the basis of existing technology, the output voltage Vo of low difference voltage regulator and a predeterminated voltage are sued for peace by this generating circuit from reference voltage, and using the reference voltage of this summed result as dc-dc, by the feedback loop of dc-dc, the output voltage VDC of dc-dc is carried out accommodation, to realize preferably, low difference voltage regulator input and output voltage is poor, thus realizes higher system efficiency.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing used required in embodiment being described is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings. Wherein:
Fig. 1 is the circuit diagram of the electric power management circuit in the utility model in an embodiment.
[embodiment]
Detailed description of the present utility model is mainly through the running describing direct or indirect simulation technical solutions of the utility model of program, step, logic block, process or other symbols. For thorough understanding the utility model, ensuing description set forth a lot of specific detail. And when not having these specific detail, the utility model then may still can realize. Technician in art uses the work that these describe and statement effectively introduces them to the others skilled in the art in art herein essential. In other words, it is the purpose of this utility model of avoiding confusion, owing to the method known and program be not it should be readily understood that therefore they are described in detail.
Alleged herein " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the utility model. Different local in this manual " in the embodiment " occurred not all refers to same embodiment, neither be independent or optionally mutually exclusive with other embodiments embodiment.
Please refer to shown in Fig. 1, it is the circuit diagram of the electric power management circuit in the utility model in an embodiment. This electric power management circuit comprises dc-dc 110, low difference voltage regulator 120 and generating circuit from reference voltage 130. Compared with traditional circuit, the utility model is set up generating circuit from reference voltage 130.
Described dc-dc 110 comprises feedback control circuit 112 and Power convert circuit 114. Described Power convert circuit 114 comprises the first power switch MP1 and the 2nd power switch MN1, and input voltage VDD, by the first power switch MP1 and the 2nd power switch MN1 alternate conduction, is converted to output voltage VDC by it; Described feedback control circuit 112 comprises the first output terminal that the grid with the first power switch MP1 is connected and the 2nd output terminal being connected with the grid of the 2nd power switch MN1, described feedback control circuit 112 is based on output voltage VDC and reference voltage Vref, the first actuate signal PDRV is exported by its first output terminal, two driving signal NDRV is exported by its 2nd output terminal, described first actuate signal PDRV drives the first power switch MP1 conducting or shutoff, and described two driving signal DNRV drives the 2nd power switch MN1 conducting or shutoff.
The input terminus of described low difference voltage regulator 120 is connected with the output voltage VDC of described dc-dc 110, its output end vo is as the output terminal of electric power management circuit, described low difference voltage regulator 120 is for carrying out low pressure reduction adjustment to the output voltage VDC of described dc-dc 110, and exporting output voltage Vo by its output terminal, output voltage Vo specific output voltage VDC has less voltage ripple.
In the embodiment shown in fig. 1, described low difference voltage regulator 120 comprises operational amplifier OP1, output tube MP2 and the 2nd current source I2, the source electrode of described output tube MP2 is connected with described output voltage VDC with lining body, its drain electrode is connected with the just end of the 2nd current source I2, the negativing ending grounding of the 2nd current source I2; Connection node between first input terminus of operational amplifier OP1 with output tube MP2 and the 2nd current source I2 is connected, its the 2nd input terminus is connected with reference voltage Ref, its output terminal is connected with the grid of output tube MP2, and the connection node between output tube MP2 and the 2nd current source I2 is connected with the output end vo of described low difference voltage regulator 120; Output capacitance Co connects and between output end vo and ground, output resistance RL is connected between output end vo and ground.
The output voltage Vo of low difference voltage regulator 120 and a predeterminated voltage are sued for peace by described generating circuit from reference voltage 130, this sum voltages as the reference voltage Vref be supplied to dc-dc 110.
In FIG, described generating circuit from reference voltage 130 comprises power tube MP3, the first current source I1 and voltage source V dsat, and the just end of described first current source I1 is connected with input voltage VDD, and its negative terminal is connected with lining body with the source electrode of power tube MP3; The drain electrode of power tube MP3 is connected with the output voltage Vo of described low difference voltage regulator 120, and the grid of power tube MP3 is connected with the positive pole of described voltage source V dsat; Voltage source V dsat negative pole ground connection, the volts lost between the source electrode of power tube MP3 and drain electrode is described predeterminated voltage, and the voltage on connection node between the first current source I1 and power tube MP3 is described reference voltage Vref.
Preferably, output tube MP2 in power tube MP3 and low difference voltage regulator 120 is the MOS pipe of identical type, the ratio of the breadth-length ratio of power tube MP3 is 1/K times of the ratio of the breadth-length ratio of output tube MP2, the 1/K that the current value of current source I1 is designed to the maximum output current of low difference voltage regulator 120 doubly (K be greater than 1 natural number, in an actual embodiment, K=10000), like this, on power tube MP3 formed volts lost equal low difference voltage regulator 120 when maximum output current output tube MP2 source and drain extremely on formed maximum voltage drop; The magnitude of voltage of voltage source V dsat is designed to meet in low difference voltage regulator 120 operational amplifier OP1 and is operated in the minimum output voltage of saturation region, such as 100mV. The output voltage Vo of low difference voltage regulator 120 adds Vp3 (i.e. power tube MP3 source electrode and the volts lost in drain electrode), it is the output voltage values Vmin of the dc-dc 110 meeting the minimum input and output voltage difference of low difference voltage regulator 120, by above-mentioned voltage is set to the reference voltage Vref of dc-dc 110 medial error amplifier EA, then its output voltage VDC is adjusted the output voltage values Vmin of the dc-dc 110 equaling the minimum input and output voltage difference of low difference voltage regulator 120 by the feedback loop of dc-dc 110. Like this, it is possible to the low difference voltage regulator input and output voltage of realization the best is poor, thus realizes the highest system efficiency.
In the embodiment shown in fig. 1, first input terminus of operational amplifier OP1 is positive input, and its 2nd input terminus is negative input; Output tube MP2 and power tube MP3 is PMOS transistor.
In the embodiment shown in fig. 1, described feedback control circuit 112 comprises error amplifier EA, PWM comparer (PWMComparator) and driving circuit Driver. First input terminus of described error amplifier EA is connected with described reference voltage Vref, and its 2nd input terminus is connected with the output voltage VDC of described dc-dc 110, and its output terminal is connected with the first input terminus of described PWM comparer; 2nd input terminus of PWM comparer is connected with choppy sea signal Ramp, and the output terminal of PWM comparer is connected with the input terminus of driving circuit Driver; First output terminal of driving circuit Driver is connected with the grid of the first power switch MP1, and its 2nd output terminal is connected with the grid of the 2nd power switch MN1. The error that described error amplifier EA amplifies described reference voltage Vref and described output voltage VDC to obtain and exports error and amplifies voltage EAO; Described PWM comparer is used for comparing choppy sea signal Ramp and described error amplification voltage EAO with output pulse width modulation signal PWMO: described driving circuit Driver exports the first actuate signal PDRV and two driving signal NDRV based on described width modulation signal PWMO.
In the embodiment shown in fig. 1, first input terminus of described error amplifier EA is positive input, and its 2nd input terminus is negative input; First input terminus of described PWM comparer is positive input, and its 2nd input terminus is negative input.
Described Power convert circuit 114 comprises the first power switch MP1, the 2nd power switch MN1, inductance L 1 and electric capacity C1. The source electrode of described first power switch MP1 is connected with input voltage VDD with lining body, and its drain electrode is connected with the drain electrode of the 2nd power switch MN1, the source electrode of the 2nd power switch MN1 and lining body ground connection; Connection node between first power switch MP1 and the 2nd power switch MN1 is successively through described inductance L 1 and electric capacity C1 ground connection, and the voltage of the connection node between inductance L 1 and electric capacity C1 is described output voltage VDC. In the embodiment shown in fig. 1, the first power switch MP1 is PMOS transistor, and the 2nd power switch MN1 is nmos pass transistor.
Dc-dc 110 in Fig. 1 is step-down controller, error amplifier EA is by comparing output voltage VDC and the reference voltage Vref of dc-dc 110, produce error and amplify voltage EAO, PWM comparer compares error and amplifies voltage EAO and choppy sea signal Ramp, produce width modulation signal PWMO, the first power switch MP1 and the 2nd power switch MN1 is driven through driving mechanism Driver, after inductance L 1 and electric capacity C1 filtering, produce the output voltage VDC of dc-dc 110, then feed back to the negative-phase input of error amplifier EA. Forming feedback loop like this, when this feedback loop is stablized, VDC voltage equals reference voltage Vref.
In sum, the utility model has set up generating circuit from reference voltage 130 on the basis of existing technology, this generating circuit from reference voltage 130 is sued for peace based on the output voltage Vo of low difference voltage regulator 120 and the predeterminated voltage of the maximum voltage drop on the output tube MP2 in reaction low difference voltage regulator 120, and this sum voltages is supplied to dc-dc 110 as the reference voltage, then its output voltage VDC is adjusted the output voltage values Vmin of the dc-dc 110 equaling the minimum input and output voltage difference of low difference voltage regulator 110 by the feedback loop of dc-dc. like this, it is possible to the low difference voltage regulator input and output voltage of realization the best is poor, thus realizes the highest system efficiency.
" connection ", " being connected " or " connecting " in the utility model etc. represent that the word being electrically connected all represents electrical indirectly or directly connecting. Above-mentioned explanation has fully disclosed embodiment of the present utility model. It is noted that be familiar with the scope that any change that embodiment of the present utility model done by person skilled in art does not all depart from claim book of the present utility model. Correspondingly, the scope of claim of the present utility model is also not limited only to previous embodiment.
Claims (10)
1. an electric power management circuit, it is characterised in that, it comprises dc-dc, low difference voltage regulator and generating circuit from reference voltage, and described dc-dc comprises feedback control circuit and Power convert circuit,
Described Power convert circuit comprises the first power switch and the 2nd power switch, and input voltage, by the first power switch and the 2nd power switch alternate conduction, is converted to output voltage VDC by it;
Described feedback control circuit comprises the first output terminal that the grid with the first power switch is connected and the 2nd output terminal being connected with the grid of the 2nd power switch, described feedback control circuit is based on output voltage VDC and reference voltage Vref, the first actuate signal is exported by its first output terminal, two driving signal is exported by its 2nd output terminal, described first actuate signal drives the first power switch conducting or shutoff, and described two driving signal drives the 2nd power switch conducting or shutoff;
The input terminus of described low difference voltage regulator is connected with output voltage VDC, described low difference voltage regulator for output voltage VDC is carried out low pressure reduction adjustment, to obtain output voltage Vo;
The output voltage Vo of low difference voltage regulator and a predeterminated voltage are sued for peace by described generating circuit from reference voltage, this sum voltages as the reference voltage Vref be supplied to dc-dc.
2. electric power management circuit according to claim 1, it is characterised in that,
Described low difference voltage regulator comprises output tube and operational amplifier,
Described predeterminated voltage equal low difference voltage regulator when maximum output current the source and drain of output tube extremely on formed maximum voltage drop.
3. electric power management circuit according to claim 2, it is characterised in that,
Described generating circuit from reference voltage comprises power tube, the first current source and voltage source, and the just end of described first current source is connected with input voltage, and its negative terminal is connected with the source electrode of power tube; The drain electrode of power tube is connected with described output voltage Vo, and the grid of power tube is connected with the positive pole of described voltage source; The negative pole ground connection of voltage source, the volts lost between the source electrode of power tube and drain electrode is described predeterminated voltage, and the voltage on connection node between the first current source and power tube is described reference voltage Vref.
4. electric power management circuit according to claim 3, it is characterised in that,
Power tube and output tube are the MOS pipe of identical type, and the ratio of the breadth-length ratio of power tube is 1/K times of the ratio of the breadth-length ratio of output tube; The current value of the first current source be the maximum output current of low difference voltage regulator 1/K doubly, K be greater than 1 natural number,
The magnitude of voltage of voltage source equals the minimum output voltage that operational amplifier in low difference voltage regulator is operated in saturation region.
5. electric power management circuit according to claim 4, it is characterised in that,
Described low difference voltage regulator also comprises the 2nd current source, the source electrode of described output tube and being connected with described output voltage VDC, and its drain electrode is connected with the just end of the 2nd current source, the negativing ending grounding of the 2nd current source; Connection node between first input terminus of operational amplifier with output tube and the 2nd current source is connected, and its 2nd input terminus is connected with reference voltage Ref, and its output terminal is connected with the grid of output tube; The voltage of the connection node between output tube and the 2nd current source is output voltage Vo.
6. electric power management circuit according to claim 5, it is characterised in that,
First input terminus of operational amplifier is positive input, and its 2nd input terminus is negative input;
Output tube and power tube are PMOS transistor.
7. electric power management circuit according to claim 5, it is characterised in that,
Described feedback control circuit comprises error amplifier, PWM comparer and driving circuit,
First input terminus of described error amplifier is connected with described reference voltage Vref, and its 2nd input terminus is connected with described output voltage VDC, and its output terminal is connected with the first input terminus of described PWM comparer; 2nd input terminus of PWM comparer is connected with choppy sea signal Ramp, and the output terminal of PWM comparer is connected with the input terminus of driving circuit; First output terminal of driving circuit is connected with the grid of the first power switch, and its 2nd output terminal is connected with the grid of the 2nd power switch.
8. electric power management circuit according to claim 7, it is characterised in that,
The error that described error amplifier amplifies described reference voltage Vref and described output voltage VDC to obtain and exports error and amplifies voltage;
Described PWM comparer is used for comparison reference signal and described error amplifies voltage with output pulse width modulation signal;
Described driving circuit exports the first actuate signal and two driving signal NDRV based on described width modulation signal.
9. electric power management circuit according to claim 8, it is characterised in that,
Described Power convert circuit comprises the first power switch, the 2nd power switch, inductance L 1 and electric capacity C1,
The source electrode of described first power switch is connected with input voltage, and its drain electrode is connected with the drain electrode of the 2nd power switch, the source ground of the 2nd power switch;
Connection node between first power switch and the 2nd power switch is successively through described inductance L 1 and electric capacity C1 ground connection, and the voltage of the connection node between inductance L 1 and electric capacity C1 is described output voltage VDC.
10. electric power management circuit according to claim 9, it is characterised in that,
First input terminus of described error amplifier is positive input, and its 2nd input terminus is negative input; First input terminus of described PWM comparer is positive input, and its 2nd input terminus is negative input;
Described first power switch is PMOS transistor, and the 2nd power switch is nmos pass transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521129386.2U CN205283395U (en) | 2015-12-29 | 2015-12-29 | Power management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521129386.2U CN205283395U (en) | 2015-12-29 | 2015-12-29 | Power management circuit |
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| Publication Number | Publication Date |
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| CN205283395U true CN205283395U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521129386.2U Withdrawn - After Issue CN205283395U (en) | 2015-12-29 | 2015-12-29 | Power management circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490537A (en) * | 2015-12-29 | 2016-04-13 | 无锡中感微电子股份有限公司 | Power management circuit |
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2015
- 2015-12-29 CN CN201521129386.2U patent/CN205283395U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490537A (en) * | 2015-12-29 | 2016-04-13 | 无锡中感微电子股份有限公司 | Power management circuit |
| CN105490537B (en) * | 2015-12-29 | 2017-11-24 | 无锡中感微电子股份有限公司 | A kind of electric power management circuit |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160601 Effective date of abandoning: 20171124 |
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| AV01 | Patent right actively abandoned |