CN110289758B - Low-power-consumption power supply circuit and electronic equipment - Google Patents
Low-power-consumption power supply circuit and electronic equipment Download PDFInfo
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- CN110289758B CN110289758B CN201910512002.1A CN201910512002A CN110289758B CN 110289758 B CN110289758 B CN 110289758B CN 201910512002 A CN201910512002 A CN 201910512002A CN 110289758 B CN110289758 B CN 110289758B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
Abstract
The invention discloses a low-power-consumption power supply circuit and electronic equipment, comprising a phaseA main DC-DC chip and at least one auxiliary DC-DC chip which are connected in parallel; when the system is powered on, the main DC-DC chip is started to operate, all the auxiliary DC-DC chips are closed, and the output current I of the main DC-DC chip is detected: when I is>IHWhen the control system is used, the secondary DC-DC chips are controlled to operate one by one until IL<I<IH(ii) a When I is<ILAnd when the auxiliary DC-DC chips run, the auxiliary DC-DC chips in the running state are controlled to be closed one by one until IL<I<IH(ii) a Wherein, ILIs a low current threshold, IHIs a high current threshold, and IL<IO<IH，IOThe output current value of the DC-DC chip working at the maximum electric energy conversion efficiency is obtained. By adopting the power supply circuit, the heating value and the energy loss of the DC-DC chip can be reduced when the system current is larger, and the purpose of reducing the system power consumption is further achieved.
Description
Technical Field
The invention belongs to the technical field of power supply circuits, and particularly relates to a DC-DC power supply circuit for reducing system power consumption.
Background
When a user uses a portable electronic device powered by a battery, the standby time of the electronic device is highly required. In practical applications, especially, the operation power consumption of electronic devices used in some industries is relatively large, and under the current limited battery technology level, it is a main means for prolonging the standby time of the electronic devices to reduce the system power consumption of the electronic devices to the maximum.
A DC-DC power supply chip (DC-DC chip) is commonly used in the design of a power supply circuit of an electronic device, and is used to convert a DC voltage of a certain magnitude into a DC voltage of another magnitude, for example, to convert a 12V DC voltage into a 5V DC voltage, so as to meet the power consumption requirement of a load in the electronic device. However, the DC-DC chip has different degrees of energy loss during power conversion, and follows the rule that the higher the conversion efficiency, the less the energy loss. Conversion efficiency is generally expressed in percentage, and the electric energy conversion efficiency of the DC-DC chip in the use process can reach 80-95%.
The electric energy conversion efficiency of the DC-DC chip is not a fixed value, and when the output currents are different, the conversion efficiency usually differs by 5% -15%. When the system current is large, if the DC-DC chip works under the condition of large current for a long time, the DC-DC chip can generate heat seriously, the energy loss is increased, the energy of a battery is excessively consumed, and the standby time of the electronic equipment is shortened. In addition, the DC-DC chip generates heat, which also affects the service life of the DC-DC chip and reduces the reliability of the operation of the electronic device.
Disclosure of Invention
The power supply circuit is designed based on the plurality of DC-DC chips, and when the system current is large, the system current is distributed on the plurality of DC-DC chips, so that the load of a single DC-DC chip can be reduced, the heat productivity and the energy loss of the DC-DC chip are reduced, and the design purpose of reducing the system power consumption is further achieved.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, the present invention provides a low power consumption power supply circuit, including a DC-DC chip, a current detection unit, and a control unit; the DC-DC chip receives the direct current input voltage and converts and outputs the direct current output voltage required by the load; the DC-DC chips comprise a plurality of main DC-DC chips and at least one auxiliary DC-DC chip which are connected in parallel, and the main DC-DC chips operate after the system is powered on; the current detection unit detects an output current I of the main DC-DC chip; the control unit controls the working state of the secondary DC-DC chip according to the output current I as follows: after the system is started and operated, firstly controlling all the auxiliary DC-DC chips to be closed; when I is>IHWhen the control system is used, the secondary DC-DC chips are controlled to operate one by one until IL<I<IH(ii) a When I is<ILAnd when the auxiliary DC-DC chips run, the auxiliary DC-DC chips in the running state are controlled to be closed one by one until IL<I<IH(ii) a Wherein, ILIs a low current threshold, IHIs a high current threshold, and IL<IO<IH，IOThe output current value of the DC-DC chip working at the maximum electric energy conversion efficiency M is obtained.
Preferably, the high current threshold IHThe value taking mode is as follows: when the DC-DC coreThe output current of the chip is IHThe electric energy conversion efficiency of the DC-DC chip is larger than M-2% so as to ensure that the DC-DC chip can operate near the maximum electric energy conversion efficiency as much as possible, and IO<IH<2IO。
In order to ensure that the output current of the main DC-DC chip is not reduced to a low current threshold I due to the connection of the auxiliary DC-DC chip in the initial stage of putting the auxiliary DC-DC chip into operationLThe invention preferably designs the low current threshold in such a way that the normal operation of the supply circuit is influenced
Further, the output current of the DC-DC chip is preferably designed to be ILAnd in the process, the electric energy conversion efficiency of the DC-DC chip is more than M-10% so as to ensure that the DC-DC chip can always work under higher conversion efficiency, and further the total power consumption of the system is further reduced by reducing the energy loss of the DC-DC chip.
Preferably, when the output current I of the main DC-DC chip is larger than the output current I of the main DC-DC chip<ILAnd when all the auxiliary DC-DC chips are closed, the running state of the main DC-DC chip is kept, and the normal running of the electronic equipment is maintained.
Preferably, when the output current I of the main DC-DC chip is larger than the output current I of the main DC-DC chip>IHAnd when all the auxiliary DC-DC chips are in the running state, the main DC-DC chip and all the auxiliary DC-DC chips are controlled to be closed, so that the power supply circuit enters a protection state, and the condition that the DC-DC chips are seriously heated to influence the running safety of the system is avoided.
In order to enable each DC-DC chip to operate at or near its maximum conversion efficiency, the main DC-DC chip and all the sub-DC chips preferably have the same or similar correspondence relationship between the electric energy conversion efficiency and the output current.
In order to realize the effective control of the control unit on the working state of the secondary DC-DC chip, the invention preferably adopts the following two control schemes:
firstly, the control unit is connected with an enabling end of the auxiliary DC-DC chip, and the working state of the auxiliary DC-DC chip is changed by performing enabling control on the auxiliary DC-DC chip;
and secondly, one switch is respectively connected in a connecting line of each secondary DC-DC chip and the direct current input voltage, and the control unit changes the working state of each secondary DC-DC chip by controlling the on-off of each switch.
In another aspect, the present invention also provides an electronic device including a DC-DC chip, a current detection unit, and a control unit; the DC-DC chip receives the direct current input voltage and converts and outputs the direct current output voltage required by the load; the DC-DC chips comprise a plurality of main DC-DC chips and at least one auxiliary DC-DC chip which are connected in parallel, and the main DC-DC chips operate after the system is powered on; the current detection unit detects an output current I of the main DC-DC chip; the control unit controls the working state of the secondary DC-DC chip according to the output current I as follows: after the system is started and operated, firstly controlling all the auxiliary DC-DC chips to be closed; when I is>IHWhen the control system is used, the secondary DC-DC chips are controlled to operate one by one until IL<I<IH(ii) a When I is<ILAnd when the auxiliary DC-DC chips run, the auxiliary DC-DC chips in the running state are controlled to be closed one by one until IL<I<IH(ii) a Wherein, ILIs a low current threshold, IHIs a high current threshold, and IL<IO<IH，IOThe output current value of the DC-DC chip working at the maximum electric energy conversion efficiency M is obtained.
Compared with the prior art, the invention has the advantages and positive effects that: the invention adopts a mode of parallel connection of a plurality of DC-DC chips to design a power supply circuit, and can automatically select one or a plurality of DC-DC chips to be put into operation according to the magnitude of system current to complete the conversion task of a direct current input power supply, thereby reducing the load of a single DC-DC chip by distributing the system current to the plurality of DC-DC chips when the system current is larger, avoiding the heating of the DC-DC chips caused by long-time working under the condition of large current, not only reducing the heat productivity of the DC-DC chips, but also prolonging the service life of the DC-DC chips and improving the operation of the system circuitSafety and reliability. Furthermore, by judicious selection of the low current threshold ILAnd a high current threshold IHThe electric energy conversion efficiency of the DC-DC chip can be maintained near the maximum conversion efficiency as much as possible, and then the design purpose of reducing the total power consumption of the system is achieved by reducing the energy loss of the DC-DC chip.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic block circuit diagram of one embodiment of a low power supply circuit in accordance with the present invention;
FIG. 2 is a schematic block circuit diagram of another embodiment of a low power supply circuit in accordance with the present invention;
FIG. 3 is a graph showing the relationship between the power conversion efficiency of a DC-DC chip of a certain type and the variation of the output current;
fig. 4 is a control flow chart of the main control unit in fig. 1 and 2 for the DC-DC chip.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In this embodiment, in order to implement a low power consumption design for a power supply circuit, a plurality of DC-DC chips are used to perform conversion processing on a DC input power supply, and when a system current is small, one DC-DC chip may be used to convert a DC input voltage into a DC output voltage required by a load, so as to supply power to the load; when the system current is large, the plurality of DC-DC chips are used for simultaneously carrying out power conversion and supplying power to the load together, so that the current distributed to each DC-DC chip can be reduced, the heat productivity of each DC-DC chip is reduced, and the design purpose of reducing the power consumption of the power supply circuit is achieved by improving the electric energy conversion efficiency of the DC-DC chips.
As shown in fig. 1 and 2, the present embodiment is provided with one main DC-DC chip and at least one sub DC-DC chip in the power supply circuit. And after all the DC-DC chips are connected in parallel, the DC-DC chips are connected between a power interface and a load. The power interface of this embodiment represents a terminal or a node for accessing a DC input power, where the DC input power may be provided by an internal battery of the electronic device, or may be provided by a power adapter externally connected to the electronic device, or may be generated by rectifying and converting AC mains power by an AC-DC module built in the electronic device, and the source of the DC input power in this embodiment is not limited to the above examples. Each DC-DC chip is configured to perform a conversion process from the DC input voltage Vi n to the DC output voltage Vout required by the load when operating. In the power supply circuit, a current detection unit is arranged to be connected with a terminal of a main DC-DC chip for outputting the direct current output voltage Vout, and is used for collecting the output current I of the main DC-DC chip, generating a detection signal corresponding to the output current I and sending the detection signal to a main control unit in a load, so that the main control unit can monitor the output current I of the main DC-DC chip in real time. According to the electric energy conversion characteristic of the DC-DC chip, two current thresholds I are predeterminedLAnd IHWherein, ILIs a low current threshold, IHAnd the current is a high current threshold value, and the current is respectively written into the main control unit. In actual use, the control unit controls the output current I of the main DC-DC chip to be equal to two current thresholds ILAnd IHAnd comparing to judge whether the auxiliary DC-DC chips need to be started to cooperate with the main DC-DC chip to supply power for the load together, and automatically switching and controlling the working states of the auxiliary DC-DC chips.
The power conversion efficiency of the DC-DC chip is changed with the output current of the DC-DC chip, and fig. 3 shows a graph of the power conversion efficiency of a certain type of DC-DC chip with the change of the output current. In the figure, the vertical axis represents the conversion efficiency of the DC-DC chip; the horizontal axis represents the output current of the DC-DC chip; the curves in different modes show that the DC-DC chip has different input voltages VINAnd an output voltage VOUTThe correspondence between the conversion efficiency and the output current.
With an input voltage VINIs 12V, and outputs voltage VOUTThe curve of 3.3V (middle dotted line) is described as an example. In fig. 3, a dotted line in the middle is a curve with a high middle and low sides, and when the output current of the DC-DC chip is 1.2A, the conversion efficiency is 93%, which reaches the maximum value; when the output current of the DC-DC chip is less than 1.2A, the conversion efficiency of the DC-DC chip is reduced along with the reduction of the output current; when the output current of the DC-DC chip is greater than 1.2A, the conversion efficiency thereof decreases as the output current increases.
For the power supply circuit of the embodiment, the low current threshold I is determinedLAnd a high current threshold IHThen, the following determination may be adopted:
firstly, when the models of a main DC-DC chip and an auxiliary DC-DC chip are selected, the DC-DC chip with the same model is preferably selected; even if the DC-DC chips with the same type are not selected, the DC-DC chips with the same or similar corresponding relation between the electric energy conversion efficiency and the output current are selected so as to ensure that each DC-DC chip which is put into operation can work near the maximum conversion efficiency as much as possible;
secondly, according to the direct current input voltage Vin of the power supply circuit and the direct current output voltage Vout required by the load, a corresponding relation curve of the electric energy conversion efficiency and the output current of the DC-DC chip under the conditions of the input voltage and the output voltage is found out, and then the output current value I of the DC-DC chip at the maximum electric energy conversion efficiency M is determined according to the corresponding relation curveO；
Then, when the output current is larger than IOAnd selecting a current value as the high current threshold I in the interval that the electric energy conversion efficiency is more than M-2%HAnd satisfy IO<IH<2IOThe conditions of (a);
finally, when the output current is less than IOAnd selecting a current value as the low current threshold I in the interval that the electric energy conversion efficiency is more than M-10%LAnd satisfy
The conditions of (1).
The DC-DC chip of the type shown in fig. 3 will be described as an example. Assuming that the DC input voltage Vin of the power supply circuit is 12V and the DC output voltage Vout required by the load is 3.3V, the dashed line in fig. 3 is a corresponding relationship curve between the electric energy conversion efficiency and the output current of the DC-DC chip under the conditions of the input voltage and the output voltage. For the corresponding relation curve, firstly, the maximum electric energy conversion efficiency M of the DC-DC chip is determined to be 93%, and the corresponding output current value I is determinedO1.2A; then, a current value 2A at which the output current is larger than 1.2A and the electric energy conversion efficiency is 92% is selected as a high current threshold value, i.e., IH2A, satisfies IO<IH<2IOThe conditions of (a); the current value 0.5A, at which the output current is less than 1.2A and the electric energy conversion efficiency is 89%, is selected as the low current threshold value, i.e., IL0.5A, satisfies
The conditions of (1).
As can be seen from fig. 3, is located at IOThe conversion efficiencies corresponding to the current values on both sides are not symmetrical points centered on the maximum conversion efficiency M in fig. 3, because the larger the output current value is, the larger the energy loss is when the conversion efficiencies are both changed by 1%. Thus, a high current threshold I is setHWhen compared to the low current threshold I should be chosenLThe corresponding electric energy conversion efficiency point is an output current value corresponding to an electric energy conversion efficiency point closer to the maximum conversion efficiency M. So that the output current I at the DC-DC chip is lower than IOWhen the method is used, the conversion efficiency of the DC-DC chip can be kept between 85% and 93%; and the output current I at the DC-DC chip is higher than IODuring the process, the conversion efficiency can be maintained between 92% and 93%, so that the DC-DC chip can be ensured to work near the maximum conversion efficiency all the time, the energy loss of the DC-DC chip is reduced as much as possible, and the purpose of reducing the total power consumption of the system is achieved.
Will determine a good low current threshold ILAnd a high current threshold IHAnd writing the current into the main control unit for storage, wherein in the practical application process, the main control unit can automatically control each auxiliary DC-DC chip 1-n in the power supply circuit to switch the working state thereof according to the real-time change of the output current I of the main DC-DC chip.
The control process of the main control unit is specifically described below with reference to fig. 4. The method comprises the following steps:
s401, after the system is powered on, the main DC-DC chip starts to operate, the direct current input voltage Vin is converted into direct current output voltage Vout, and power is supplied to the control unit and other loads.
S402, after the control unit is powered on to operate, all the auxiliary DC-DC chips 1-n are controlled to keep the default closed state.
And S403, the main control unit receives the detection signal output by the current detection unit and analyzes the detection signal to obtain the output current I of the main DC-DC chip.
S404, when the main control unit detects I>IHWhen the control system is used, the secondary DC-DC chips are controlled to operate one by one until IL<I<IHReturning to the step S403 to continue monitoring the output current I of the main DC-DC chip;
in the embodiment, the main control unit detects the output current I of the main DC-DC chip>IHFirstly, controlling one auxiliary DC-DC chip 1 to operate, and utilizing the two DC-DC chips to supply power for a load together; at this time, the output currents split between the two DC-DC chips are respectively
If it is
The operation requirement can be met only by controlling one auxiliary DC-DC chip 1 to cooperate with the main DC-DC chip, and other auxiliary DC-DC chips 2-n are kept in a closed state. If it is
Then, one secondary DC-DC chip 2 needs to be controlled to operate, and the three DC-DC chips are used for supplying power to the load together; at this time, the number of the channels is divided into threeThe output currents on the DC-DC chip are respectively
If it is
It means that the two sub-DC chips 1 and 2 need to be controlled to operate in cooperation with the main DC-DC chip to meet the working requirement, and the other sub-DC chips 3 to n can be kept in a closed state. In the same way, a mode of controlling the n auxiliary DC-DC chips to operate one by one is adopted until the output current of the main DC-DC chip meets IL<I<IHUntil now.
In practical applications, the output current I of the main DC-DC chip is generally gradually increased. After the system is powered on and operated, the output current I of the main DC-DC chip is initially smaller than ILOr between IL～IHMeanwhile, only the main DC-DC chip is used for supplying power to the load. As the system operation time is lengthened or the number of loads put into operation is gradually increased, the output current I of the main DC-DC chip may be gradually increased. When the main control unit detects the output current I of the main DC-DC chip>IHImmediately controlling a secondary DC-DC chip 1 to operate to reduce the output current I of the main DC-DC chip to IHThe following. Due to the set low current threshold
Therefore, the output current I of the main DC-DC chip satisfies IL<I<IHThe conditions of (1). When the output current I of the main DC-DC chip continues to rise, exceeds I againHWhen the secondary DC-DC chip 2 is added to be put into operation, the output current I of the main DC-DC chip returns to I againL～IHIn the meantime. By analogy, the operation of the n auxiliary DC-DC chips 1-n is controlled one by one until the output current I of the main DC-DC chip meets IL<I<IHUntil now.
When all the auxiliary DC-DC chips 1-n are put into operation, if the output current I of the main DC-DC chip exceeds the high current threshold IHThen it comes out ofIn consideration of the safety of the system circuit operation, the embodiment preferably controls the main DC-DC chip and all the sub-DC chips 1 to n to be turned off, so that the system circuit enters the protection mode, and the safety and reliability of the system circuit operation are prevented from being affected due to serious heat generation of the DC-DC chips.
S405, when the main control unit detects I<ILWhen the control system is used, the secondary DC-DC chips are controlled to be closed one by one until IL<I<IHOr when all the auxiliary DC-DC chips are closed, returning to the step S403 to continuously monitor the output current I of the main DC-DC chip;
when the main control unit detects the output current I of the main DC-DC chip<ILIn order to maintain the conversion efficiency of the DC-DC chip as close as possible to the maximum conversion efficiency, the present embodiment gradually increases the output current I of the main DC-DC chip by controlling the sub-DC chips 1 to n to be turned off one by one until I is satisfiedL<I<IHUntil now.
When all the auxiliary DC-DC chips are turned off, if the output current I of the main DC-DC chip is still less than the set low current threshold ILAnd keeping the running state of the main DC-DC chip and only utilizing the main DC-DC chip to supply power for the load. At this moment, although the electric energy conversion efficiency of the power supply circuit is not high, the system circuit can be ensured to continuously and safely operate, and the continuous use requirement of the electronic equipment is met.
In order to realize the automatic switching control of the main control unit on the working states of the respective DC-DC chips, the following two preferable control methods are proposed in this embodiment:
mode one, enable control mode
As shown in fig. 1, for the DC-DC chip having the enable control terminal EN, the operating state of the DC-DC chip can be changed by performing enable control on the DC-DC chip in an enable control manner. As a preferred embodiment, n paths of IO ports of the main control unit may be selected to output n paths of enable signals, and the enable signals are respectively transmitted to the enable terminals EN of the n sub DC-DC chips 1 to n in a one-to-one correspondence manner. When one auxiliary DC-DC chip needs to be controlled to be closed, the main control unit outputs an invalid enabling signal (such as a low level signal) to the auxiliary DC-DC chip, and controls the auxiliary DC-DC chip to stop enabling and be in a closed state; on the contrary, when a certain auxiliary DC-DC chip needs to be controlled to operate, the main control unit outputs an effective enabling signal (such as a high-level signal) to the auxiliary DC-DC chip, and controls the auxiliary DC-DC chip to enable and enter an operating state.
For the main DC-DC chip, the DC input voltage Vin may be used to enable and control the main DC-DC chip, for example, for the high-level enabled main DC-DC chip, the enable terminal of the main DC-DC chip may be connected to the power interface, when the system is powered on, the DC input voltage Vin is established, and the main DC-DC chip enables to operate, so as to provide the DC output voltage Vout required by the operation of the main control unit and other loads. When the main DC-DC chip needs to be controlled to be closed, the potential on the enabling terminal of the main DC-DC chip can be pulled down by using the control signal output by the main control unit so as to control the main DC-DC chip to be closed.
Mode two, switch control mode
As shown in fig. 2, a switch may be connected to each line of the DC-DC chips receiving the DC input voltage Vin, and the operating state of the DC-DC chips may be changed by controlling the on/off of each switch. As a preferred embodiment, a normally closed switch K0 can be selected to be connected to the input end of the main DC-DC chip, and n normally open switches K1-Kn can be selected to be connected to the input ends of n sub DC-DC chips 1-n respectively. And outputting n +1 paths of switch control signals by using the main control unit to control the on-off of the normally closed switch K0 and the n normally open switches K1-Kn. For example, when the system is powered on, the normally closed switch K0 is closed, the normally open switches K1-Kn are opened, the main DC-DC chip is powered on to operate, and the n auxiliary DC-DC chips 1-n are closed. When one auxiliary DC-DC chip needs to be controlled to operate, the main control unit controls a normally open switch connected with the auxiliary DC-DC chip to be closed, and controls the auxiliary DC-DC chip to be electrified and to enter an operating state. When the main DC-DC chip needs to be controlled to be closed, the main control unit controls the normally closed switch K0 to be switched off, and controls the main DC-DC chip to be powered off and stop running.
Of course, other control methods may be adopted to switch and control the operating state of the DC-DC chip, and the embodiment is not limited to the above example.
The low-power-consumption power supply circuit of the embodiment is mainly applied to electronic equipment which is powered by a battery and has a high requirement on system power consumption, such as mobile phones, smart watches, smart glasses and other terminal equipment. Of course, the method can also be applied to any other electronic equipment needing to reduce the power consumption of the system.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A low power consumption power supply circuit, comprising:
a DC-DC chip which receives a DC input voltage and converts a DC output voltage required by an output load; the DC-DC chips comprise a plurality of main DC-DC chips and a plurality of auxiliary DC-DC chips which are connected in parallel, and the main DC-DC chips operate after the system is powered on;
a current detection unit that detects an output current I of the main DC-DC chip;
the control unit controls the working state of the secondary DC-DC chip according to the output current I as follows:
after the system is started and operated, firstly controlling all the auxiliary DC-DC chips to be closed;
when I is>IHWhen the control system is used, the secondary DC-DC chips are controlled to operate one by one until IL<I<IH；
When I is<ILAnd when the auxiliary DC-DC chips run, the auxiliary DC-DC chips in the running state are controlled to be closed one by one until IL<I<IH；
Wherein, ILIs a low current threshold, IHIs a high current threshold, and IL<IO<IH，IOThe output current value of the DC-DC chip working at the maximum electric energy conversion efficiency M is obtained; the high current threshold IHThe value-taking conditions of (1) satisfy: when the output current of the DC-DC chip is IHThen, the electric energy conversion efficiency of the DC-DC chip is more than M-2 percent, and IO<IH<2IO；
The low current threshold ILThe value-taking conditions of (1) satisfy: when the output current of the DC-DC chip is ILThe electric energy conversion efficiency of the DC-DC chip is more than M-10%, and
2. the low power consumption power supply circuit of claim 1, wherein when the output current I of the main DC-DC chip is larger than the output current I of the main DC-DC chip<ILAnd when all the auxiliary DC-DC chips are closed, the running state of the main DC-DC chip is maintained.
3. The low power consumption power supply circuit of claim 1, wherein when the output current I of the main DC-DC chip is larger than the output current I of the main DC-DC chip>IHAnd when all the auxiliary DC-DC chips are in the running state, the main DC-DC chip and all the auxiliary DC-DC chips are controlled to be closed, so that the power supply circuit enters a protection state.
4. The low power consumption power supply circuit according to any one of claims 1 to 3, wherein the main DC-DC chip and all the auxiliary DC-DC chips have the same or similar correspondence relationship between power conversion efficiency and output current.
5. The power supply circuit with low power consumption according to any one of claims 1 to 3, wherein the control unit is connected with an enabling terminal of the secondary DC-DC chip, and is used for performing enabling control on the secondary DC-DC chip so as to change the working state of the secondary DC-DC chip.
6. The low power consumption power supply circuit according to any one of claims 1 to 3, wherein a switch is connected to a connection line between each of the sub DC-DC chips and the DC input voltage, and the control unit controls the switches to be turned on or off to change an operating state of each of the sub DC-DC chips.
7. An electronic device characterized by comprising a low-power-consumption power supply circuit according to any one of claims 1 to 6.
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| CN103346673A (en) * | 2013-07-23 | 2013-10-09 | 阳光电源股份有限公司 | Multichannel parallel-connection DC-DC convertor control system and method |
| CN203554283U (en) * | 2013-10-11 | 2014-04-16 | 青岛伏科太阳能有限公司 | High power direct current converting circuit and photovoltaic system |
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