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WO2013000367A1 - 电子设备和单个电源向至少两个不同负载供电的方法 - Google Patents

电子设备和单个电源向至少两个不同负载供电的方法 Download PDF

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Publication number
WO2013000367A1
WO2013000367A1 PCT/CN2012/077118 CN2012077118W WO2013000367A1 WO 2013000367 A1 WO2013000367 A1 WO 2013000367A1 CN 2012077118 W CN2012077118 W CN 2012077118W WO 2013000367 A1 WO2013000367 A1 WO 2013000367A1
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WO
WIPO (PCT)
Prior art keywords
load
switch
power supply
power
control signal
Prior art date
Application number
PCT/CN2012/077118
Other languages
English (en)
French (fr)
Inventor
黄会阳
Original Assignee
华为终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to EP12804299.1A priority Critical patent/EP2629400B1/en
Priority to JP2013543519A priority patent/JP5700136B2/ja
Publication of WO2013000367A1 publication Critical patent/WO2013000367A1/zh
Priority to US13/894,714 priority patent/US9170641B2/en

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Classifications

    • GPHYSICS
    • G06COMPUTING OR CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • G06F1/32Means for saving power
    • G06F1/3203Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234Power saving characterised by the action undertaken
    • G06F1/3287Power saving characterised by the action undertaken by switching off individual functional units in the computer system
    • GPHYSICS
    • G06COMPUTING OR CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • G06F1/266Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/345Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing, e.g. low power processors, power management or thermal management

Definitions

  • Embodiments of the present invention relate to power supply technologies, and more particularly to a method for powering an electronic device and a single power supply to at least two different loads.
  • the prior art mainly adopts a direct power multiplexing mode, that is, one power supply is simultaneously used for several peripherals (equivalent to a load), and the advantages thereof are: the circuit barrel is single, and the cost is reduced. And it is conducive to the small size of electronic products, which is convenient for users to carry and move.
  • the above method of directly multiplexing the power supply requires that the peripherals must have the same operating voltage to work simultaneously.
  • the power supply to the peripheral cannot be turned off, thereby causing power consumption. waste.
  • An embodiment of the present invention provides a method for powering an electronic device and a single power supply to at least two different loads, which is used to solve the defect that the power supply multiplexing requires the same load voltage and cannot separately shut down a load, and realizes a power supply. It can power multiple different loads and save power.
  • An embodiment of the present invention provides an electronic device, including a power supply and a central processing module, further including: at least two load power supply circuits, wherein the load power supply circuit includes a capacitor unit and at least one switch and at least one feedback resistor unit;
  • the switch is respectively connected to the power source and the central processing module, and is configured to be turned on or off according to a control signal output by the central processing module;
  • the feedback resistor unit is connected to the switch and the load, and is configured to, when the switch is turned on, a source, for the power source to supply power to the load according to the adopted voltage;
  • the capacitor unit is connected to the switch and the load for charging when the switch is turned on; or, when the switch is turned off, supplying power to the load.
  • An embodiment of the present invention provides a method for supplying power to a single power source to at least two different loads, including: receiving, by a load power supply circuit, a control signal output by a central processing module;
  • the load power supply module selects a power source or a capacitor unit in the load power supply circuit to supply power to the load according to the control signal.
  • the electronic device and the method for supplying power to a single power source to at least two different loads wherein at least two load power supply circuits are disposed in the electronic device, and the load power supply circuit includes a capacitor unit, at least one switch, and at least one feedback
  • the load power supply circuit includes a capacitor unit, at least one switch, and at least one feedback
  • the feedback resistor unit samples the load, and sends the sampled sampled voltage to the power supply, so that the power supply supplies power to the load according to the sampled voltage;
  • the control unit outputs a shutdown control signal
  • the capacitor unit supplies power to the load.
  • FIG. 1 is a schematic structural view of an embodiment of an electronic device according to the present invention
  • FIG. 2 is a schematic structural view of another embodiment of an electronic device according to the present invention.
  • FIG. 3 is a schematic structural view of still another embodiment of an electronic device according to the present invention.
  • FIG. 4 is a circuit schematic diagram of still another embodiment of an electronic device according to the present invention.
  • FIG. 5 is a partial circuit schematic diagram of the power supply 31 in the electronic device shown in Figure 4;
  • FIG. 6 is a circuit schematic diagram of a first load power supply circuit 32 in the electronic device shown in FIG. 4.
  • FIG. 7 is a circuit schematic diagram of a second load power supply circuit 33 in the electronic device shown in FIG. 4.
  • the electronic device of the embodiment includes: a power source 11, a central processing module 12, and at least two load power supply circuits 13, wherein the load power supply circuit 13 includes at least one switch 131, at least one feedback resistor unit 132, and a capacitor unit 133.
  • the switch 131 is respectively connected to the power source 11 and the central processing module 12 for opening or closing according to a control signal output by the central processing module 12; the feedback resistor unit 132 is connected to the switch 131 and the load for opening at the switch 131.
  • the sampling voltage obtained by sampling is fed back to the power source 11 through the switch 131, so that the power source 11 supplies power to the load according to the sampling voltage;
  • the capacitor unit 133 is connected to the switch 131 and the load, and is used for When the switch 131 is turned on, charging is performed; or, when the switch 131 is turned off, power is supplied to the load.
  • control signal may be turned on or the control signal may have a shutdown signal;
  • the central processing module 12 may be specifically a central processing unit (Central Processing Unit; CPU: CPU);
  • the power supply 11 may be a low dropout linear regulator ( Low Dropout Regulator; Cartridge: LDO) or DC to DC converter;
  • feedback resistor unit 132 may include a resistor and capacitor unit, wherein the resistance of the resistor is related to the voltage at which the load connected to the feedback resistor unit 132 operates. .
  • At least two load power supply circuits are disposed in the electronic device, and the load power supply circuit includes at least one switch, at least one feedback resistance unit, and a capacitor unit, and the switch module is turned on according to a control signal output by the central processing module.
  • the trigger feedback resistor unit samples the load, and sends the sampled sampled voltage to the power supply, so that the power supply supplies power to the load according to the sampling voltage; when the switch module is turned off according to the control signal output by the central processing module, the capacitor unit is Power is supplied to the load. Since one load can be powered by the capacitor unit connected to it when one load is supplied from the power source, the power supply can supply power to multiple loads, thereby solving the prior art power supply multiplexing load. The voltage is the same, and the defect of one load cannot be turned off separately, and power consumption is effectively saved.
  • I represents the current of the capacitor
  • Cd ( u ) represents the change of the capacitor voltage
  • d ( t) indicates the change in time.
  • the switching frequency between the load supply is 100K
  • the capacitance of C194 and C191 is 10uf
  • the voltage ripple is 0.2V.
  • the following loads ensure that the capacitor continues to supply power to the load when the power module is not supplying power to the load.
  • it is possible to speed up the switching frequency and increase the continuous capacitance before the load, so that the load can be better supplied with continuous current.
  • the continuous capacitance before the load is increased is to increase the number of capacitors in the capacitor unit, or increase the capacity of the capacitor in the capacitor unit without increasing the number of capacitors.
  • FIG. 2 is a schematic structural diagram of another embodiment of an electronic device according to the present invention.
  • three loads are required as one power source (three loads may be the same or different).
  • the power supply is taken as an example to describe the technical solution of the embodiment in detail.
  • the electronic device includes a power source 21, a central processing module 22, and three load power supply circuits, respectively for the first load power supply circuit 23 and the second load. Circuit 24 and third load supply circuit 25.
  • the first load power supply circuit 23 includes a first switch 231, a first feedback resistor unit 232, and a first capacitor unit 233.
  • the second load power supply circuit 24 includes a second switch 241, a second feedback resistor unit 242, and a second capacitor unit.
  • the third load power supply circuit 25 includes a third switch 251, a third feedback resistor unit 252, and a third capacitor unit 253.
  • the central processing module 22 is respectively connected to the first switch 231, the second switch 241, and the third switch 251; the first switch 231, the first feedback resistor unit 232, and the first capacitor unit 233 are respectively associated with the first load phase
  • the second switch 241, the second feedback resistor unit 242 and the second capacitor unit 243 are respectively connected to the second load; the third switch 251, the third feedback resistor unit 252 and the third capacitor unit 253 are respectively connected to the third load phase connection.
  • the resistance values in the first feedback resistor unit 232, the second feedback resistor unit 242, and the third feedback resistor unit 252 may be set to be the same; when the three loads are different, the The resistance values in the first feedback resistor unit 231, the second feedback resistor unit 242, and the third feedback resistor unit 252 are different.
  • the central processing module 22 when the central processing module 22 outputs an open control signal to the first switch 231, and outputs a close control signal to the second switch 241 and the third switch 251, respectively, the central processing module 22 controls the first switch 231 to be turned on, and When the second switch 241 and the third switch 251 are turned off, the first load is sampled by the first feedback resistor unit 232, and the first sampled voltage obtained after the sampling is fed back to the power source 21 through the first switch 231 to notify How much voltage is required by the first load of the power source 21, so that the trigger power source 21 outputs power to the first switch 231 according to the first sampling voltage, and outputs the power source to the first load by the first switch 231 to implement the first load. powered by.
  • the first switch 231 also outputs a power source to the first capacitor unit 233 to charge the first capacitor unit 233.
  • the second capacitor unit 243 supplies power to the second load; the third capacitor unit 253 supplies power to the third.
  • the central processing module 22 When the central processing module 22 outputs an open control signal to the second switch 241, respectively, to the first switch 231 and the third switch 251 output a shutdown control signal, that is, when the central processing module 22 controls the second switch 241 to be turned on, and controls the first switch 231 and the third switch 251 to be turned off, the second load is performed by the second feedback resistor unit 242. Sampling, and the second sampling voltage obtained after sampling is fed back to the power source 21 through the second switch 241 to notify the power source 21 how much voltage the second load needs, so that the trigger power source 21 outputs the power according to the second sampling voltage to the second The switch 241 and the second switch 241 outputs a power source to the second load to implement power supply to the second load.
  • the second switch 241 also outputs a power source to the second capacitor unit 243 to implement charging of the second capacitor unit 243.
  • the first capacitor unit 233 supplies power to the first load;
  • the third capacitor unit 253 supplies power to the third load.
  • the second sampling voltage fed back by the second switch 241 to the power source 21 may be the first sampling voltage fed back to the power source 21 by the first switch 231.
  • the second sampling voltage fed back by the second switch 241 to the power source 21 may be different from the first sampling voltage fed back to the power source 21 by the first switch 231. .
  • the central processing module 22 When the central processing module 22 outputs an open control signal to the third switch 251, respectively outputting a close control signal to the first switch 231 and the second switch 241, that is, the central processing module 22 controls the third switch 251 to open, and controls the first switch 231 and
  • the second switch 241 When the second switch 241 is turned off, the third load is sampled by the third feedback resistor unit 252, and the third sampled voltage obtained after the sampling is fed back to the power source 21 through the third switch 251 to notify the power source 21 of the third load. How much voltage is needed, so that the trigger power source 21 outputs power to the third switch 251 according to the third sampling voltage, and the third switch 251 outputs the power source to the third load to implement power supply to the third load.
  • the third switch 251 also outputs a power source to the third capacitor unit 253 to charge the third capacitor unit 253.
  • the first capacitor unit 233 supplies power to the first load; the second capacitor unit 243 supplies power to the second load. It should be noted that, at this time, when the first load, the second load, and the third load are the same, that is, the working voltage is the same, the third sampling voltage fed back by the third switch 251 to the power source 21 can be powered by the second switch 241.
  • the second sampling voltage fed back, the first sampling voltage fed back by the first switch 231 to the power source 21 is the same; when the first load, the second load, and the third load are different, that is, the working voltage is different, the third switch 251
  • the third sampling voltage fed back to the power source 21 may be different from the second sampling voltage fed back by the second switch 241 to the power source 21, and the first sampling voltage fed back to the power source 21 by the first switch 231.
  • the central processing module 22 may send the shutdown control signal to the first switch 231 to cause the first switch 231 to be turned off, after the first capacitor unit 233 is discharged.
  • the first load stops working, so that power consumption can be effectively saved when the first load is not working.
  • each of the load power supply circuits includes a switch, a feedback resistor, and a capacitor unit. Since the power source supplies power to the first load, the other two loads of the copper drum can be powered.
  • the capacitor unit in the circuit supplies power to the second load and the third load, so that the power supply can be supplied to different loads; in addition, the switch in the corresponding load power supply circuit can be turned off when the load is different, thereby solving the problem
  • the power supply multiplexing requires the same load voltage, and the defect of one load cannot be separately turned off, so that one power supply can supply power to a plurality of different loads, and the power consumption is effectively saved.
  • the sleep signal may be sent to the central processing module, so that the central processing module always turns off the switch connected to the load according to the sleep signal, because The energy stored in the capacitor unit is limited.
  • the capacitor unit can supply the load for up to 1 second. Therefore, when the energy stored in the capacitor unit is exhausted, the load does not work and the supply voltage is zero volt (V).
  • V volt
  • FIG. 3 is a schematic structural diagram of still another embodiment of an electronic device according to the present invention.
  • the technical solution of the embodiment is described in detail by taking the third load as the standby low voltage operation as an example. As shown in FIG.
  • the third load power supply circuit 25 further includes: a fourth switch 254 and a fourth feedback resistor unit 255, wherein the fourth switch 254 is connected to the power source 21 and the central processing module 22 for use according to the central processing module 22 The output control signal is turned on or off; the fourth feedback resistor unit 255 is connected to the third load and the fourth switch 254 for sampling the third load when the fourth switch 254 is turned on, and sampling the fourth obtained The sampling voltage is fed back through the fourth switch 254
  • the power source 21 is supplied to the power source 21 to supply power to the third load according to the fourth sampling voltage.
  • the third load When the third load is in the standby low voltage operation, the third load outputs a low voltage operation signal to the central processing module 22 through the third switch 251, and after receiving the low voltage operation signal, the central processing module 22 according to the low voltage operation signal, The third switch 251 outputs a shutdown control signal.
  • the fourth feedback resistor unit 255 samples the third load, and feeds the sampled fourth sampling voltage to the power source 21 through the fourth switch 254 for The power source 21 supplies power to the third load according to the fourth sampling voltage.
  • the third sampling voltage sampled by the third feedback resistor unit 252 is a normal working voltage of the third load (for example, 2V), and the fourth sampling voltage obtained by the fourth feedback resistor unit 255 is the third load.
  • Low power voltage eg 1.2V.
  • At least one switch and feedback resistor unit can be included in each load supply module such that the voltage across each load can have multiple supply voltage selections.
  • each load power supply circuit includes at least one switch, at least one feedback resistor and a capacitor unit, which can be turned on by a switch in each load power supply circuit. Or off, and when the switch is based on the open control signal output by the central processing module, the feedback resistor unit samples the load, and sends the sampled sampled voltage to the power supply, so that the power supply supplies power to the load according to the sampled voltage;
  • the capacitor unit supplies power to the load, thereby solving the defect that the power supply multiplexing requires the same load voltage in the prior art, and cannot separately shut down one load, thereby realizing that one power supply can be given differently.
  • the load is powered and effectively saves power.
  • the load can be selected under different requirements, and different power supply voltages can be selected, thereby effectively realizing the flexibility of power supply to the load. .
  • FIG. 4 is an inventive electronic device.
  • Figure 5 is the electronic device shown in Figure 4.
  • FIG. 6 is a circuit schematic diagram of the first load power supply circuit 32 in the electronic device shown in FIG. 4
  • FIG. 7 is a circuit diagram of the second load power supply circuit 33 in the electronic device shown in FIG. Schematic diagram, as shown in Figure 4 to Figure 7:
  • the electronic device includes: a power source 31, a first load power supply circuit 32, and a second load power supply circuit 33, wherein the first load power supply circuit 32 includes: a first switch 321, a first feedback resistor unit 322, and a first capacitor unit 323.
  • the second load power supply circuit 33 includes: a second switch 331, a second feedback resistor unit 332, a second capacitor unit 333, a third switch 334, and a third feedback resistor unit 335.
  • the first switch 321 is a two-way transistor, including two transistors and two resistors, wherein the pin 1 of the first switch 321 is connected to the pin 1 of the first switch 331 , and the pin 2 of the first switch 321 Connected to the SELECT 12 of the central processing module (not shown), the pin 5 of the first switch 321 is connected to the SELECT 11 of the central processing module, and the pin 4 of the first switch 321 is used to receive the power supply VREG_C output from the power source 31, first The pin 3 of the switch 321 is used for outputting the power supply VDD1, and the pin 6 of the first switch 321 is connected to the first feedback resistor unit 322; the first feedback resistor unit 322 includes a resistor R181, a resistor R180 and a capacitor C190; wherein, the resistor R180 is connected in parallel with the capacitor C190.
  • the capacitor unit 323 includes three capacitors, a capacitor C191, a capacitor C192 and a capacitor C193, a capacitor C191, a capacitor C192 and a capacitor C193 in parallel, and a capacitor C191, One end of the capacitance C192 and capacitor C193 connected to ground, connected to the other end of the capacitor C191, a capacitor C192 and a capacitor C193 and switch 321 of the first pin 3.
  • capacitor C191 is used to supply power to the load; capacitor C192 and capacitor C193 are used to filter out ripple.
  • the second switch 331 is a two-way transistor, including two transistors and two resistors, wherein the pins 1 of the second switch 331 are respectively connected to the pin 1 of the first switch 321 and the third switch 334, and the second switch 331
  • the pin 2 is connected to the SELECT221 of the central processing module
  • the pin 5 of the second switch 331 is connected to the SELECT211 of the central processing module
  • the pin 4 of the second switch 331 is for receiving the power supply VREG_C output by the power source 31
  • the second switch 331 Pin 3 is used to output the power supply VDD2
  • the pin 6 of the second switch 331 is connected to the second feedback resistor unit 332;
  • the second feedback resistor unit 332 includes a resistor R183, a resistor R182 and a capacitor C197; wherein, the resistor R182 and the capacitor C197 are connected in parallel, and the resistor R182 and the capacitor C197 are connected at one end.
  • the second capacitor unit 333 includes three capacitors, namely capacitor C194, capacitor C195 and capacitor C196; one end of capacitor C194, capacitor C195 and capacitor C196 is connected to ground, and the other end of capacitor C194, capacitor C195 and capacitor C196 is connected to the second switch. Pin 3 of 331 is connected.
  • capacitor C194 is used to supply power to the load; capacitor C195 and capacitor C196 are used to filter out ripple.
  • the third switch 334 is a two-way transistor, including two transistors and two resistors, wherein the pin 1 of the third switch 334 is connected to the pin 1 of the second switch 331, and the pin of the third switch 334 and the central processing module
  • the SELECT 222 is connected, the pin 5 of the third switch 334 is connected to the central processing module SELECT212, the pin 6 of the third switch 334 is connected to the third feedback resistor unit 335;
  • the third feedback resistor unit comprises a resistor R189, a resistor R184 and a capacitor C198; wherein, the resistor R184 and the capacitor C198 are connected in parallel, and one end of the resistor R184 and the capacitor C198 is connected to the pin 3 of the second switch 331, and the other end of the resistor R184 and the capacitor C198 is connected to one end of the resistor R189, and the other end of the resistor R189 Connected to the ground.
  • the central processing module controls
  • the SELECT12 signal goes low, causing the first switch 321 to be saturated and gated, so that the resistor R180 and the resistor R181 in the first feedback resistor unit 322 sample the load.
  • the first sampling voltage VREG_C is obtained, and the first sampling voltage VREG_C is fed back to the FB pin of the power source 31, and the power source 31 outputs the power VREG_C ⁇ r to the first switch 321 according to the first sampling voltage VREG_C. Feet 4.
  • the central processing module controls the SELECT11 signal to go low, so that the first switch 321 is saturated and turned on, so that the pin 4 of the first switch 321 receives the power VREG_C output from the power source 31, and outputs power through the pin 3 of the first switch 321 .
  • the second switch 331 and the third switch 334 are turned off, and the load connected to the first switch 321 is supplied by C194.
  • VREF is a constant value. It should be noted that the voltage of the load is related to the values of the resistor R181 and the resistor R180.
  • the central processing module controls the SELECT 221 signal to go low, so that the second switch 331 is saturated and gated, so that the resistor R183 in the second feedback resistor unit 332 is made.
  • the SELECT 211 signal goes low, causing the second switch 331 to be saturated, so that the pin 4 of the second switch 331 receives the power supply VREG_C output from the power supply 31, and outputs the power supply VDD2 through the pin 3 of the second switch 331.
  • the first switch 321 and the third switch 334 are turned off, and the load connected to the first switch 331 is supplied by C191.
  • the central processing control module controls the SELECT 211 signal to go low, the transistor having the pin 3, the pin 4, and the pin 5 in the second switch 331 is turned on, and the second switch 331 has the pin 1, the pin 2, and The transistor of the pin 6 is turned off. Therefore, the pin 4 of the second switch 331 receives the power VREG_C output from the power module 31, and outputs the power supply VDD2 through the pin 3 of the second switch 331, which is a low voltage, and simultaneously The first switch 321 is turned off, and the load connected to the first switch 321 is powered by C191.
  • the capacitor C194 is turned to the second switch 331.
  • the connected load is powered. Since the power supply time of the capacitor C194 is short, for example, it is within about 0.2 seconds. Therefore, after the capacitor C194 is discharged after 0.2 seconds, the load connected to the second switch 331 is no longer supplied.
  • the discharge current of the capacitor should be greater than the current required when the load can work normally, specifically, the current of the capacitor in the capacitor unit.
  • I represents the current of the capacitor
  • Cd ( u ) represents the change of the capacitor voltage
  • d ( t ) represents the change of time.
  • the switching frequency between the load supply is 100K
  • the capacitance of C194 and C191 is 10uf
  • the voltage ripple is 0.2V.
  • the continuous capacitance before the load is increased is to increase the number of capacitors in the capacitor unit, or increase the capacity of the capacitor in the capacitor unit without increasing the number of capacitors.
  • FIG. 8 is a flowchart of an embodiment of a method for powering a single power supply to at least two different loads according to the present invention. As shown in FIG. 8, the method in this embodiment includes:
  • Step 101 The load power supply circuit receives a control signal output by the central processing module.
  • the load power supply circuit may be the load power supply module in the embodiment shown in Figures 1 to 4.
  • the control signal can be an open control signal or a closed control signal.
  • Step 102 The load power supply circuit selects a capacitor unit in the power module or the load power supply module to supply power to the load according to the control signal.
  • the control signal outputted by the central processing module is received by the load power supply, and the capacitor unit in the power supply or the load power supply circuit is selected to supply power to the load according to the control signal, thereby solving the power supply complex in the prior art.
  • the load voltage is the same, and the fault of one load cannot be turned off separately, a power supply can supply power to a plurality of different loads, and power consumption is effectively saved.
  • step 102 the basis of the embodiment shown in FIG. 8 above.
  • the implementation of step 102 is as follows:
  • the load power supply circuit samples the load according to the open control signal, and outputs the sampled sampled voltage to the power supply module, so that the power supply outputs the power according to the sampling voltage;
  • the load power supply circuit receives power and outputs it to the load.
  • step 102 is as follows:
  • the load power supply module selects the capacitor unit in the power supply load circuit to supply power to the load according to the shutdown control signal.
  • the load when the control signal output by the central processing module is output, the load is sampled, and the sampling voltage obtained by the sampling is sent to the power module, so that the power supply supplies power to the load according to the sampling voltage; when the central processing module When the output control signal is turned off, the capacitor unit supplies power to the load, thereby solving the defect that the power supply multiplexing requirement load voltage is the same in the prior art, and the load cannot be individually shut down, so that one power supply can be applied to multiple different loads. Power is supplied, and power consumption is effectively saved.
  • different loads refer to loads having different voltage requirements, and loads of the same nature, when operating in high voltage and low voltage states, respectively, also belong to different loads as described in various embodiments of the present invention.
  • the central processing module needs to control the switches in the respective load supply circuits so that at the same time, the power supply supplies only the load of the same voltage demand. If there are different loads in the whole circuit, the central processing module adopts the manner of turning on and off the switches in the corresponding load power supply circuits in turn, so that the capacitors in the load power supply circuits are alternately charged and discharged to achieve continuous power supply to the load. In order to ensure continuous power supply to the load, the time that the central processing module turns off the switch of a particular load supply circuit should not be greater than the discharge time of the capacitor used to supply the load in the load supply circuit.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

一种电子设备和单个电源向至少两个不同负载供电的方法,该电子设备包括:电源(11)和中央处理模块(12),还包括:至少两个负载供电电路(13),其中,负载供电电路(13)包括电容单元(133)、至少一个开关(131)和至少一个反馈电阻单元(132);开关(131),分别与电源(11)和中央处理模块(12)相连接,用于根据中央处理模块(12)输出的控制信号打开或者关闭;反馈电阻单元(132),与开关(131)和负载相连接,用于在开关(131)打开时,对负载进行采样,并将采样获取的采样电压通过开关(131)反馈给所述电源(11),以供电源(11)根据采样电压,向负载供电;电容单元(133),与开关(131)和负载相连接,用于在开关(131)打开时,进行充电;或者,在开关(131)关闭时,向负载供电。实现了一个电源可以为多个不同负载进行供电,有效降低了功耗。

Description

电子设备和单个电源向至少两个不同负载供电的方法 本申请要求于 2011 年 6 月 27 日提交中国专利局, 申请号为 201110175432.2、 发明名称为 "电子设备和单个电源向至少两个不同负载供电 的方法" 的中国专利申请, 其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及电源技术, 尤其涉及一种电子设备和单个电源向至少 两个不同负载供电的方法。
背景技术
目前, 由于平台厂家考虑成本问题, 因此, 多数芯片平台集成的电源不 够多, 从而也使得芯片提供的电源接口也相对较少; 另外, 在电子产品外设 过多时, 也会造成芯片提供的电源接口不够用。
为了解决芯片提供的电源接口不够用的问题, 现有技术中主要采用电源 直接复用方式, 即一个电源同时用于几个外设(相当于负载), 其优点是: 电 路筒单, 成本降低, 且有利于电子产品体积小, 便于用户携带和移动的要求。
但是, 上述电源直接复用的方式要求这几个外设必须工作电压相一致, 才能同时工作; 另外, 其中一个外设不工作时, 不能关闭对该外设的供电, 从而造成了功耗的浪费。
发明内容
本发明实施例提供一种电子设备和单个电源向至少两个不同负载供电的 方法, 用以解决现有技术中电源复用要求负载电压相同, 且不能单独关闭一 个负载的缺陷, 实现了一个电源可以给多个不同的负载进行供电, 并有效地 节省了功耗。
本发明实施例提供一种电子设备, 包括电源和中央处理模块, 还包括: 至少两个负载供电电路, 其中, 所述负载供电电路包括电容单元和至少一个 开关和至少一个反馈电阻单元; 所述开关, 分别与所述电源和中央处理模块相连接, 用于根据所述中央 处理模块输出的控制信号打开或者关闭;
所述反馈电阻单元, 与所述开关和负载相连接, 用于在所述开关打开时, 源, 以供所述电源根据所述采用电压, 向所述负载供电;
所述电容单元, 与所述开关和所述负载相连接, 用于在所述开关打开时, 进行充电; 或者, 在所述开关关闭时, 向所述负载供电。
本发明实施例提供一种单个电源向至少两个不同负载供电的方法, 包括: 负载供电电路接收中央处理模块输出的控制信号;
所述负载供电模块根据所述控制信号, 选择电源或者所述负载供电电路 中的电容单元向负载供电。
本发明实施例的电子设备和单个电源向至少两个不同负载供电的方法, 通过在电子设备中设置至少两个个负载供电电路, 且该负载供电电路包括电 容单元、 至少一个开关、 至少一个反馈电阻单元, 当开关根据中央处理模块 输出的打开控制信号时, 反馈电阻单元对负载进行采样, 并将采样获取的采 样电压发送给电源, 以供电源根据该采样电压向负载供电; 当开关根据中央 处理模块输出的关闭控制信号时, 由电容单元向负载供电, 由于可以通过电 源或者负载供电电路中的电容单元对负载供电, 因此, 解决了现有技术中电 源复用要求负载电压相同, 且不能单独关闭一个负载的缺陷, 实现了一个电 源可以给多个不同的负载进行供电, 并有效地节省了功耗。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作一筒单地介绍, 显而易见地, 下 面描述中的附图是本发明的一些实施例, 对于本领域普通技术人员来讲, 在 不付出创造性劳动性的前提下, 还可以根据这些附图获得其他的附图。 图 1为本发明电子设备的一个实施例的结构示意图;
图 2为本发明电子设备的另一个实施例的结构示意图;
图 3为本发明电子设备的又一个实施例的结构示意图;
图 4为本发明电子设备的还一个实施例的电路原理图;
图 5为图 4所示电子设备中的电源 31的局部电路原理图;
图 6为图 4所示电子设备中第一负载供电电路 32的电路原理图; 图 7为图 4所示电子设备中第二负载供电电路 33的电路原理图; 图 8 为本发明单个电源向至少两个不同负载供电的方法的一个实施例的 流程图。
具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描述, 显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于 本发明中的实施例, 本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
图 1为本发明电子设备的一个实施例的结构示意图, 如图 1所示, 本实 施例的电子设备包括: 电源 11、 中央处理模块 12和至少两个负载供电电路 13, 其中, 负载供电电路 13包括至少一个开关 131、 至少一个反馈电阻单元 132和电容单元 133。
具体的, 开关 131分别与电源 11和中央处理模块 12相连接, 用于根据 中央处理模块 12输出的控制信号打开或者关闭;反馈电阻单元 132与开关 131 和负载相连接, 用于在开关 131打开时, 对该负载进行采样, 并将采样获取 的采样电压通过开关 131反馈给电源 11, 以供电源 11根据采样电压, 向负载 供电; 电容单元 133, 与开关 131和负载相连接, 用于在开关 131打开时, 进 行充电; 或者, 在开关 131关闭时, 向负载供电。 具体的, 该控制信号可以为打开或者该控制信号可以具关闭信号; 中央 处理模块 12可以具体为中央处理器( Central Processing Unit; 筒称: CPU ); 电源 11可以为低压差线性稳压器(Low Dropout Regulator; 筒称: LDO )或 者直流转直流(DC/DC )转换器; 反馈电阻单元 132可以包括电阻和电容单 元, 其中电阻的阻值与该反馈电阻单元 132连接的负载工作的电压有关。
在本实施例中, 通过在电子设备中设置至少两个负载供电电路, 且该负 载供电电路包括至少一个开关、 至少一个反馈电阻单元和电容单元, 当开关 模块根据中央处理模块输出的控制信号打开时, 触发反馈电阻单元对负载进 行采样, 并将采样获取的采样电压发送给电源, 以供电源根据该采样电压向 负载供电; 当开关模块根据中央处理模块输出的控制信号关闭时, 由电容单 元向负载供电, 由于在一个负载通过电源供电时, 另一个负载可以通过其连 接的电容单元供电, 因此, 可以实现电源可以给多个负载进行供电, 从而解 决了现有技术中电源复用要求负载电压相同, 且不能单独关闭一个负载的缺 陷, 并有效地节省了功耗。
需要说明的是, 电容单元的放电电流大于负载能正常工作时需要的电 流。 具体的电容单元中电容的电流的计算公式可以为应用微分公式 I=Cd ( u ) /d ( t )计算得到, 其中, I表示电容的电流; Cd ( u )表示电容电压的变化; d ( t )表示时间的变化。 举例来说, 以负载供电间的切换频率为 100K, C194 和 C191的电容为 10uf, 且电压纹波为 0.2V为例, I=10uf*0.2V/ ( 1/100K ) =200ma, 则使用 50ma以下的负载则可以保证电源模块没有向负载供电时, 电容能够持续向负载供电。 另外, 在实际应用中, 可以加快切换频率和加大 负载前的持续电容, 从而可以使得负载能够更好得到持续流供电。 其中, 该 加大负载前的持续电容为增加电容单元中电容的数量, 或者在不增加电容数 量的情况下, 增加电容单元中电容的容量。
图 2为本发明电子设备的另一个实施例的结构示意图, 如图 2所示, 在 本实施例中, 以一个电源需要给三个负载(三个负载可以相同也可以不同) 供电为例, 详细介绍本实施例的技术方案, 如图 2所示, 该电子设备包括电 源 21、 中央处理模块 22和三个负载供电电路, 分别为第一负载供电电路 23、 第二负载供电电路 24和第三负载供电电路 25。
其中, 第一负载供电电路 23包括第一开关 231、 第一反馈电阻单元 232 和第一电容单元 233; 第二负载供电电路 24包括第二开关 241、 第二反馈电 阻单元 242和第二电容单元 243; 第三负载供电电路 25包括第三开关 251、 第三反馈电阻单元 252和第三电容单元 253。
具体的, 该中央处理模块 22分别与第一开关 231、 第二开关 241和第三 开关 251相连接; 第一开关 231、 第一反馈电阻单元 232、 第一电容单元 233 分别与第一负载相连接; 第二开关 241、 第二反馈电阻单元 242和第二电容单 元 243分别与第二负载相连接; 第三开关 251、 第三反馈电阻单元 252和第三 电容单元 253分别与第三负载相连接。 需要说明的是, 当三个负载相同时, 可以设置第一反馈电阻单元 232、 第二反馈电阻单元 242和第三反馈电阻单元 252中的电阻值相同; 当三个负载不相同时, 可以设置第一反馈电阻单元 231、 第二反馈电阻单元 242和第三反馈电阻单元 252中的电阻值不相同。
在本实施例中, 当中央处理模块 22向第一开关 231输出打开控制信号, 分别向第二开关 241和第三开关 251输出关闭控制信号, 即中央处理模块 22 控制第一开关 231打开, 并控制第二开关 241和第三开关 251关闭时, 则通 过第一反馈电阻单元 232对第一负载进行采样, 并将采样后获取的第一采样 电压通过第一开关 231反馈给电源 21, 以通知电源 21该第一负载需要多大的 电压, 以触发电源 21根据该第一采样电压输出电源给第一开关 231 , 并由第 一开关 231将电源输出给第一负载, 以实现对第一负载的供电。 同时, 第一 开关 231还将电源输出给第一电容单元 233 , 以实现对第一电容单元 233充 电。 另外, 第二电容单元 243向第二负载供电; 第三电容单元 253向第三供 电。
当中央处理模块 22向第二开关 241输出打开控制信号, 分别向第一开关 231和第三开关 251输出关闭控制信号, 即中央处理模块 22控制第二开关 241 打开, 并控制第一开关 231和第三开关 251关闭时, 则通过第二反馈电阻单 元 242对第二负载进行采样, 并将采样后获取的第二采样电压通过第二开关 241反馈给电源 21 , 以通知电源 21该第二负载需要多大的电压, 以触发电源 21根据该第二采样电压输出电源给第二开关 241 , 并由第二开关 241将电源 输出给第二负载, 以实现对第二负载的供电。 同时, 第二开关 241还将电源 输出给第二电容单元 243, 以实现对第二电容单元 243充电。 另外, 第一电容 单元 233向第一负载供电; 第三电容单元 253向第三负载供电。 还需要说明 的是, 当第一负载和第二负载相同, 即工作电压相同时, 第二开关 241给电 源 21反馈的第二采样电压可以与第一开关 231给电源 21反馈的第一采样电 压相同; 当第一负载和第二负载不相同, 即工作电压不相同时, 第二开关 241 给电源 21反馈的第二采样电压可以与第一开关 231给电源 21反馈的第一采 样电压不相同。
当中央处理模块 22向第三开关 251输出打开控制信号, 分别向第一开关 231和第二开关 241输出关闭控制信号, 即中央处理模块 22控制第三开关 251 打开, 并控制第一开关 231和第二开关 241关闭时, 则通过第三反馈电阻单 元 252对第三负载进行采样, 并将采样后获取的第三采样电压通过第三开关 251反馈给电源 21 , 以通知电源 21该第三负载需要多大的电压, 以触发电源 21根据该第三采样电压输出电源给第三开关 251 , 并由第三开关 251将电源 输出给第三负载, 以实现对第三负载的供电。 同时, 第三开关 251还将电源 输出给第三电容单元 253, 以实现对第三电容单元 253充电。 另外, 第一电容 单元 233向第一负载供电; 第二电容单元 243向第二负载供电。 还需要说明 的是, 此时, 当第一负载、 第二负载和第三负载相同, 即工作电压相同时, 第三开关 251给电源 21反馈的第三采样电压可以与第二开关 241给电源 21 反馈的第二采样电压、 第一开关 231给电源 21反馈的第一采样电压相同; 当 第一负载、 第二负载和第三负载不相同, 即工作电压不相同时, 第三开关 251 给电源 21反馈的第三采样电压可以与第二开关 241给电源 21反馈的第二采 样电压、 第一开关 231给电源 21反馈的第一采样电压不相同。
值得注意的是, 举例来说, 当第一负载不工作时, 中央处理模块 22可以 通过发送关闭控制信号给第一开关 231, 以使得第一开关 231关闭, 在第一电 容单元 233放电完后, 第一负载停止工作, 从而在第一负载不工作的时候, 可以有效地节省功耗。
在本实施例中, 通过在电子设备中设置三个负载供电电路, 且每个负载 供电电路包括开关、 反馈电阻和电容单元, 由于在电源对第一负载供电时, 可以铜鼓其他两个负载供电电路中的电容单元对第二负载和第三负载供电, 因此, 可以实现电源给不同的负载进行供电; 另外, 可以在负载不同时, 关 闭其对应的负载供电电路中的开关, 从而解决了现有技术中电源复用要求负 载电压相同, 且不能单独关闭一个负载的缺陷, 实现了一个电源可以给多个 不同的负载进行供电, 并有效地节省了功耗。
需要说明的是, 在上述实施例中, 当其中某一个负载不工作需要休眠时, 可以发送休眠信号给中央处理模块, 以使得中央处理模块根据该休眠信号一 直关闭该负载所连接的开关, 由于电容单元存储的能量有限, 电容单元给负 载供电最多能够支撑 1秒, 因此, 当电容单元存储的能量耗尽时, 负载不工 作, 供电电压为零伏(V )。 另外, 由于电容单元给负载供电不会从电源处吸 取能量, 因此, 有效地降低了功耗。
图 3为本发明电子设备的又一个实施例的结构示意图, 在上述图 2所示 实施例的基础上, 以第三负载处于待机低电压工作为例, 详细介绍本实施例 的技术方案, 如图 3所示, 第三负载供电电路 25还包括: 第四开关 254和第 四反馈电阻单元 255, 其中, 第四开关 254与电源 21和中央处理模块 22相连 接, 用于根据中央处理模块 22输出的控制信号打开或者关闭; 第四反馈电阻 单元 255与第三负载和第四开关 254相连接, 用于在第四开关 254打开时, 对第三负载进行采样, 并将采样获取的第四采样电压通过第四开关 254反馈 给电源 21 , 以供电源 21根据第四采样电压, 向第三负载供电。
当第三负载处于待机低电压工作时, 第三负载通过第三开关 251向中央 处理模块 22输出低电压工作信号, 中央处理模块 22接收该低电压工作信号 后, 根据该低电压工作信号, 向第三开关 251输出关闭控制信号。 另外, 在 向第四开关 254输出打开控制信号时, 则第四反馈电阻单元 255对该第三负 载进行采样, 并将采样获取的第四采样电压通过第四开关 254反馈给电源 21, 以供电源 21根据第四采样电压, 向第三负载供电。 需要说明的是, 通过第三 反馈电阻单元 252采样获取的第三采样电压为第三负载正常工作的电压(例 如: 2V ) , 第四反馈电阻单元 255采样获取的第四采样电压为第三负载低功 耗电压(例如: 1.2V ) 。
值得注意的是, 每个负载供电模块中可以包括至少一个开关和反馈电阻 单元, 从而使得每个负载上的电压可以有多个供电电压选择。
在本实施例中, 通过在电子设备中设置三个负载供电模块, 且每个负载 供电电路包括至少一个开关、 至少一个反馈电阻和电容单元, 由于可以通过 每个负载供电电路中的开关轮流打开或者关闭, 且当开关根据中央处理模块 输出的打开控制信号时, 反馈电阻单元对负载进行采样, 并将采样获取的采 样电压发送给电源, 以供电源根据该采样电压向负载供电; 当开关根据中央 处理模块输出的关闭控制信号时, 由电容单元向负载供电, 从而解决了现有 技术中电源复用要求负载电压相同, 且不能单独关闭一个负载的缺陷, 实现 了一个电源可以给多个不同的负载进行供电, 并有效地节省了功耗。 另外, 由于还可以通过每个负载供电电路中设置多个开关和反馈电阻单元, 从而可 以使得负载在不同的需求下, 实现不同的供电电压的选择, 从而有效地实现 了对负载供电的灵活性。
本发明所提供的具备上述功能的电子设备可以通过多种芯片结合外围电 路来实现, 其中一种优选的实施方案描述如图 4实施例所示, 在本实施例中, 图 4为发明电子设备的还一个实施例的电路原理图, 图 5为图 4所示电子设 备中的电源 31的局部电路原理图, 图 6为图 4所示电子设备中第一负载供电 电路 32的电路原理图, 图 7为图 4所示电子设备中第二负载供电电路 33的 电路原理图, 如图 4至图 7所示:
该电子设备包括: 电源 31、 第一负载供电电路 32和第二负载供电电路 33 , 其中, 第一负载供电电路 32包括: 第一开关 321、 第一反馈电阻单元 322 和第一电容单元 323。 第二负载供电电路 33包括: 第二开关 331、 第二反馈 电阻单元 332、 第二电容单元 333、 第三开关 334和第三反馈电阻单元 335。
具体的, 第一开关 321 为两路三极管, 包括两个三极管和两个电阻, 其 中, 第一开关 321的引脚 1与第一开关 331的引脚 1相连, 第一开关 321的 引脚 2与中央处理模块(未画出) 的 SELECT 12相连, 第一开关 321的引脚 5与中央处理模块的 SELECT11相连, 第一开关 321的引脚 4用于接收电源 31输出的电源 VREG_C, 第一开关 321的引脚 3用于输出供电电源 VDD1 , 第一开关 321的引脚 6与第一反馈电阻单元 322相连; 该第一反馈电阻单元 322包括电阻 R181、 电阻 R180和电容 C190; 其中, 电阻 R180与电容 C190 并联,电阻 R180与电容 C190的一端与第一开关 321的引脚 3相连,电阻 R180 与电容 C190的另一端与电阻 R181的一端相连, 电阻 R181的另一端与地相 连; 第一电容单元 323包括三个电容, 分别为电容 C191、 电容 C192和电容 C193 , 电容 C191、 电容 C192和电容 C193并联, 且电容 C191、 电容 C192 和电容 C193的一端与地相连, 电容 C191、 电容 C192和电容 C193的另一端 与第一开关 321的引脚 3相连。 另外, 电容 C191用于向负载供电; 电容 C192 和电容 C193用于滤除纹波。
第二开关 331 为两路三极管, 包括两个三极管和两个电阻, 其中, 第二 开关 331的引脚 1分别与第一开关 321的引脚 1以及第三开关 334相连, 第 二开关 331的引脚 2与中央处理模块的 SELECT221相连,第二开关 331的引 脚 5与中央处理模块的 SELECT211相连, 第二开关 331的引脚 4用于接收电 源 31输出的电源 VREG_C,第二开关 331的引脚 3用于输出供电电源 VDD2, 第二开关 331的引脚 6与第二反馈电阻单元 332相连; 该第二反馈电阻单元 332包括电阻 R183、 电阻 R182和电容 C197; 其中, 电阻 R182和电容 C197 并联, 电阻 R182和电容 C197的一端分别与第二开关 331的引脚 3相连; 电 阻 R182和电容 C197的另一端与电阻 R183的一端相连; 电阻 R183的另一端 与地相连。 第二电容单元 333 包括三个电容, 分别为电容 C194、 电容 C195 和电容 C196;电容 C194、电容 C195和电容 C196的一端与地相连,电容 C194、 电容 C195和电容 C196的另一端与第二开关 331的引脚 3相连。 另外, 电容 C194用于向负载供电; 电容 C195和电容 C196用于滤除纹波。
第三开关 334为两路三极管, 包括两个三极管和两个电阻, 其中, 第三 开关 334的引脚 1与第二开关 331的引脚 1相连, 第三开关 334的引脚 与 中央处理模块的 SELECT 222相连, 第三开关 334的引脚 5与中央处理模块 SELECT212相连, 第三开关 334的引脚 6与第三反馈电阻单元 335相连; 第 三反馈电阻单元包括电阻 R189、 电阻 R184和电容 C198; 其中, 电阻 R184 和电容 C198并联,且电阻 R184和电容 C198的一端与第二开关 331的引脚 3 相连, 电阻 R184和电容 C198的另一端与电阻 R189的一端相连, 电阻 R189 的另一端与地相连。
当电源 31给第一开关 321连接的负载供电时, 中央处理模块控制
SELECT12信号变低, 使得第一开关 321饱和选通, 从而使得第一反馈电阻 单元 322中的电阻 R180和电阻 R181对该负载进行采样, 具体的, 应用公式 VREG_C=VREF*R181/ ( R181+R180 ), 获取第一采样电压 VREG_C, 并将第 一采样电压 VREG_C反馈给电源 31的 FB管脚上, 则电源 31根据该第一采 样电压 VREG_C, 输出电源 VREG_C^ r出给第一开关 321的引脚 4。 另外, 中央处理模块控制 SELECT11信号变低, 使得第一开关 321饱和导通, 从而 使得第一开关 321的引脚 4接收电源 31输出的电源 VREG_C, 并通过第一开 关 321的引脚 3输出供电电源 VDD1。 同时, 第二开关 331和第三开关 334 是截止的, 由 C194向第一开关 321相连的负载供电。 其中, VREF为恒定值。 需要说明的是, 负载的电压与电阻 R181和电阻 R180的值有关。
当电源 31给第二开关 331连接的负载供电, 并使得负载正常工作时, 中 央处理模块控制 SELECT221信号变低, 使得第二开关 331饱和选通, 从而使 得第二反馈电阻单元 332中的电阻 R183和电阻 R182对该负载进行采样, 即 应用公式 VREG_C=VREF*R183/ ( R183+ R182 ), 获取第二采样电压
VREG_C, 并将该第二采样电压反馈 VREG_C给电源 31的 FB管脚上( FB 管脚上的电压为 VREF ), 则电源 31根据该第二采样电压 VREG_C, 输出电 源 VREG_C^ 出给第二开关 331的引脚 4。 另外, 中央处理模块控制
SELECT211信号变低, 使得第二开关 331饱和导通, 从而使得第二开关 331 的引脚 4接收电源 31输出的电源 VREG_C, 并通过第二开关 331的引脚 3输 出供电电源 VDD2。 同时, 第一开关 321和第三开关 334是截止的, 由 C191 向第一开关 331相连的负载供电。
当与第二开关 331连接的负载处于待机低电压工作时, 通过第二开关 331 发送低电压工作信号给中央处理模块, 则中央处理模块控制 SELECT222信号 变低, 使得第三开关 334饱和导通, 从而使得第三反馈电阻单元 335中的电 阻 R189和电阻 R184对该负载进行采样, 即应用公式 VREG_C=VREF*R189/ ( R189+ R184 ), 获取第三采样电压 VREG_C, 并将该第三采样电压 VREG_C 反馈给电源 31的 FB管脚上, 则电源 31根据该第三采样电压, 将获取的 VREG_C^ 出给第二开关 331的引脚 4。 另外, 由于中央处理控制模块控制 SELECT211信号变低, 则第二开关 331中具有引脚 3、 引脚 4和引脚 5的三 极管导通, 第二开关 331中具有引脚 1、 引脚 2和引脚 6的三极管截止, 因此, 第二开关 331的引脚 4接收电源模块 31输出的电源 VREG_C, 并通过第二开 关 331的引脚 3输出供电电源 VDD2, 该供电电源 VDD2为低电压, 同时, 第一开关 321是截止的, 且由 C191向第一开关 321相连的负载供电。
还需要说明的是 当与第二开关 331连接的负载处于不工作需要休眠时, 在电源 31给第一开关 321连接的负载供电时, 电容 C194向与第二开关 331 连接的负载供电。 由于该电容 C194供电时间 4艮短, 例如: 约为 0.2秒以内, 因此, 0.2秒以后电容 C194放电完毕不再向与第二开关 331连接的负载供电。
进一步的, 在上述实施例中, 为了保证在电源没有向负载供电时, 电容 能够持续向负载供电, 电容的放电电流应该大于负载能正常工作时需要的电 流, 具体的, 电容单元中电容的电流的计算公式可以为应用微分公式 I=Cd( u ) /d ( t )计算得到, 其中, I表示电容的电流; Cd ( u )表示电容电压的变化; d ( t )表示时间的变化。 举例来说, 以负载供电间的切换频率为 100K, C194 和 C191的电容为 10uf, 且电压纹波为 0.2V为例, I=10uf*0.2V/ ( 1/100K ) =200ma, 则使用 50ma以下的负载则可以保证电源模块没有向负载供电时, 电容能够持续向负载供电。 另外, 在实际应用中, 可以加快切换频率和加大 负载前的持续电容, 从而可以使得负载能够更好得到持续流供电。 其中, 该 加大负载前的持续电容为增加电容单元中电容的数量, 或者在不增加电容数 量的情况下, 增加电容单元中电容的容量。
图 8为本发明单个电源向至少两个不同负载供电的方法的一个实施例的 流程图, 如图 8所示, 本实施例的方法包括:
步骤 101、 负载供电电路接收中央处理模块输出的控制信号。
在本实施例中, 负载供电电路可以为图 1至 4所示实施例中的负载供电 模块。 控制信号可以为打开控制信号或者关闭控制信号。
步骤 102、 负载供电电路根据控制信号, 选择电源模块或者负载供电模块 中的电容单元向负载供电。
在本实施例中, 通过负载供电电^^收中央处理模块输出的控制信号, 并根据该控制信号, 选择电源或者负载供电电路中的电容单元向负载供电, 从而解决了现有技术中电源复用要求负载电压相同, 且不能单独关闭一个负 载的缺陷, 实现了一个电源可以给多个不同的负载进行供电, 并有效地节省 了功耗。
进一步的, 在本发明的另一个实施例中, 在上述图 8所示实施例的基础 上, 步骤 102的一种实现方式为:
当控制信号为打开控制信号时, 负载供电电路根据该打开控制信号, 对 负载进行采样, 并将采样获取的采样电压输出给电源模块, 以供电源根据采 样电压, 输出电源;
负载供电电路接收电源, 并输出给负载。
或者, 步骤 102的另一中实现方式为:
当控制信号为关闭控制信号时, 负载供电模块根据关闭控制信号, 选择 供电负载电路中的电容单元向所述负载供电。
在本实施例中, 通过当中央处理模块输出的打开控制信号时, 对负载进 行采样, 并将采样获取的采样电压发送给电源模块, 以供电源根据该采样电 压向负载供电; 当中央处理模块输出的关闭控制信号时, 由电容单元向负载 供电, 从而解决了现有技术中电源复用要求负载电压相同, 且不能单独关闭 一个负载的缺陷, 实现了一个电源可以给多个不同的负载进行供电, 并有效 地节省了功耗。
在本发明的各实施例中, 不同的负载是指电压需求不同的负载, 同样性 质的负载, 分别工作在高电压和低电压状态时, 也属于本发明各实施例所述 的不同的负载。
需要说明的是, 在本发明的各个实施例中, 中央处理模块需要控制各负 载供电电路中的开关, 以使得在同一时刻, 电源只给电压需求相同的负载供 电。 如果整个电路中存在不同的负载, 则中央处理模块采用轮流打开和关闭 相应负载供电电路中的开关的方式, 使得各负载供电电路中的电容交替的充 电和放电, 以实现对负载的持续供电。 为了保证对负载的持续供电, 中央处 理模块关闭某一特定负载供电电路的开关的时间, 不应当大于该负载供电电 路中用于向负载供电的电容的放电时间。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机可读 取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述 的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对其 限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术 人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修改, 或 者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求书
1、 一种电子设备, 包括电源和中央处理模块, 其特征在于, 还包括: 至少 两个负载供电电路, 其中, 所述负载供电电路包括电容单元、 至少一个开关和 至少一个反馈电阻单元;
所述开关, 分别与所述电源和所述中央处理模块相连接, 用于根据所述中 央处理模块输出的控制信号打开或者关闭;
所述反馈电阻单元, 与所述开关和负载相连接, 用于在所述开关打开时, 源, 以供所述电源根据所述采用电压, 向所述负载供电;
所述电容单元, 与所述开关和所述负载相连接, 用于在所述开关打开时, 进行充电; 或者, 在所述开关关闭时, 向所述负载供电。
2、 根据权利要求 1所述的电子设备, 其特征在于, 所述电容单元的放电电 流大于所述负载能正常工作时需要的电流。
3、根据权利要求 2所述的电子设备, 其特征在于, 所述开关为三极管开关。
4、 根据权利要求 1-3所述的任一电子设备, 其特征在于, 所述中央处理模
5、 一种单个电源向至少两个不同负载供电的方法, 其特征在于, 包括: 负载供电电路接收中央处理模块输出的控制信号;
所述负载供电电路根据所述控制信号, 选择电源或者所述负载供电电路中 的电容单元向负载供电。
6、 根据权利要求 5所述的供电的方法, 其特征在于, 所述负载供电电路根 据所述控制信号, 选择电源或者所述负载供电电路中的电容单元向负载供电, 包括:
当所述控制信号为打开控制信号时, 所述负载供电电路根据所述打开控制 信号, 对所述负载进行采样, 并将采样获取的采样电压输出给所述电源, 以供 所述电源根据所述采样电压, 输出电源; 所述负载供电电^^收所述电源, 并输出给所述负载。
7、 根据权利要求 5所述的供电的方法, 其特征在于, 所述负载供电电路根 据所述控制信号, 选择电源或者所述负载供电电路中的电容单元向负载供电, 包括:
当所述控制信号为关闭控制信号时, 所述负载供电电路根据所述关闭控制 信号, 选择所述供电负载电路中的电容单元向所述负载供电。
8、 根据权利要求 5-7 所述任一的供电的方法, 其特征在于, 所述负载供电 电路的开关关闭的时间, 不长于所述电容单元的放电时间。
PCT/CN2012/077118 2011-06-27 2012-06-19 电子设备和单个电源向至少两个不同负载供电的方法 WO2013000367A1 (zh)

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