CN115113669B - Power supply circuit and power supply method - Google Patents
Power supply circuit and power supply method Download PDFInfo
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- CN115113669B CN115113669B CN202110308367.XA CN202110308367A CN115113669B CN 115113669 B CN115113669 B CN 115113669B CN 202110308367 A CN202110308367 A CN 202110308367A CN 115113669 B CN115113669 B CN 115113669B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The invention discloses a power supply circuit and a power supply method. The power supply circuit comprises a control circuit and a power circuit, the control circuit compares the first power supply voltage, the second power supply voltage and the preset reference voltage, determines the power supply voltage of the power supply circuit according to the comparison result, selects the lower potential of the first power supply voltage and the second power supply voltage as the power supply of the chip under the condition that the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage, and selects the higher potential of the first power supply voltage and the second power supply voltage as the power supply of the chip under the condition that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage, so that the normal work of the back-stage circuit can be ensured, the power consumption of the circuit can be reduced, and the light load efficiency of the circuit is improved.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a power supply circuit and a power supply method.
Background
The current portable electronic products and wearable electronic devices, such as smart phones, tablet computers, smart watches and the like, all adopt rechargeable batteries to provide power for the system, so that when no external power is connected, the battery can supply power for the system, and the system can still work normally; when the battery is not powered, the battery is charged by an external power source and the system is powered by the external power source. Therefore, the battery management chip (Power Management Integrated Circuits) is very important for these portable electronic products.
The low dropout linear regulator (Low Dropout Regulator, LDO) has the characteristics of simple structure, small static power consumption, small output voltage ripple and the like, so that the voltage conversion unit of the conventional power management chip is generally realized through the LDO. The power management chip often needs to select the voltage at the BUS or SYS terminal as the supply voltage for the internal LDO so that the LDO converts the supply voltage at the supply terminal into the operating voltage of the subsequent circuit. The traditional method is to compare the voltage of the BUS terminal with the voltage of the SYS terminal, and take the end with higher voltage as the power supply terminal of the LDO, so that the method can ensure that the later-stage circuit can obtain higher working voltage and meet the normal work of the later-stage circuit. Taking the lowest working voltage of the later-stage circuit as an example, when Vbus is greater than 5V and Vsys is less than 5V, the power management chip selects the voltage of the BUS end to supply power for the LDO, so that the output voltage of the LDO can reach 5V; when Vbus < Vsys <5V, the power management chip selects the voltage of the SYS end to supply power for the LDO, the LDO is in an overdrive state, and the output voltage can still be the maximum voltage which can be achieved under the current condition; when Vbus > Vsys >5V, the voltage of the BUS end or the voltage of the SYS end can be selected to enable the output voltage of the LDO to reach 5V, and the traditional method selects the end with higher voltage as the power supply end of the LDO, so that the power consumption of the circuit is higher, and the light load efficiency of the circuit is seriously reduced.
Disclosure of Invention
In view of the above, the present invention aims to provide a power supply circuit and a power supply method, which can reduce circuit power consumption and improve light load efficiency of a circuit on the basis of ensuring the minimum operating voltage of a subsequent circuit.
According to an aspect of an embodiment of the present invention, there is provided a power supply circuit for supplying an output voltage to a post-stage circuit, including: the control circuit is used for comparing the first power supply voltage with the second power supply voltage to obtain a first comparison signal, comparing the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage to obtain a second comparison signal, and generating a control signal according to the first comparison signal and the second comparison signal; and a power circuit controlled by the control signal to convert the first power supply voltage or the second power supply voltage into the output voltage, wherein the power circuit is used for generating the output voltage according to the lower potential of the first power supply voltage and the second power supply voltage when the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage; and generating the output voltage according to the higher potential of the first power supply voltage and the second power supply voltage under the condition that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage.
Optionally, the control circuit includes: the voltage division module is used for obtaining a first voltage division signal and a second voltage division signal according to the first power supply voltage and the second power supply voltage respectively; a comparison selection module for comparing the first divided voltage signal and the second divided voltage signal to generate the first comparison signal and a first voltage signal, the first voltage signal being used to characterize the lower of the first supply voltage and the second supply voltage; the non-inverting input end of the first comparator receives the first voltage signal, the inverting input end of the first comparator receives the reference voltage signal representing the preset reference voltage for comparison, and the output end of the first comparator outputs the second comparison signal; and the output module is characterized in that a first input end receives the first comparison signal, a second input end receives the second comparison signal and an output end outputs the control signal.
Optionally, the comparison selection module includes: the non-inverting input end of the second comparator receives the second divided signal, the inverting input end of the second comparator receives the first divided signal, and the output end of the second comparator outputs the first comparison signal; the first switch is connected between the first voltage division signal and the output end of the first voltage signal; and the second switch is connected between the second voltage division signal and the output end of the first voltage signal, wherein the first switch and the second switch are controlled by the first comparison signal, and the first switch and the second switch are not conducted at the same time.
Optionally, the output module is configured to output the control signal to be at a logic low level when one of the first comparison signal and the second comparison signal is at a logic low level; and outputting the control signal to be a logic high level when the levels of the first comparison signal and the second comparison signal are the same.
Optionally, the output module is implemented by an exclusive nor gate.
Optionally, the power circuit is configured to generate the output voltage according to the first supply voltage when the control signal is at a logic high level, and generate the output voltage according to the second supply voltage when the control signal is at a logic low level.
Optionally, the power circuit includes: the first conversion module is used for converting the first power supply voltage into a first conversion voltage; the second conversion module is used for converting the second power supply voltage into a second conversion voltage; and a third switch, wherein a first input end is connected with the output end of the first conversion module, a second input end is connected with the output end of the second conversion module, and the third switch is used for obtaining the output voltage according to the first conversion voltage when the control signal is at a logic high level and obtaining the output voltage according to the second conversion voltage when the control signal is at a logic low level.
Optionally, the first conversion module and the second conversion module are implemented by a low dropout linear voltage regulator.
Optionally, the third switch is an alternative switch formed by the MOS tube.
According to another aspect of the embodiment of the present invention, there is provided a power supply method for supplying an output voltage to a post-stage circuit, including: comparing the first power supply voltage with the second power supply voltage to obtain a first comparison signal; comparing the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage to obtain a second comparison signal; the first comparison signal and the second comparison signal generate a control signal; and converting the first supply voltage or the second supply voltage into the output voltage according to the control signal, wherein the converting the first supply voltage or the second supply voltage into the output voltage according to the control signal includes: generating the output voltage according to the lower potential of the first power supply voltage and the second power supply voltage under the condition that the control signal characterizes that the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage; and controlling the power circuit to generate the output voltage according to the higher potential of the first power supply voltage and the second power supply voltage under the condition that the control signal characterizes that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage.
In the power supply circuit and the power supply method of the embodiment of the invention, the power supply circuit comprises a control circuit and a power circuit, the control circuit is used for comparing the first power supply voltage with the second power supply voltage, determining the lower potential of the first power supply voltage and the second power supply voltage according to the first comparison result, comparing the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage to obtain the second comparison result, and controlling the switching of the power supply end of the power circuit according to the first comparison result and the second comparison result. Under the condition that the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage, the lower potential of the first power supply voltage and the second power supply voltage is selected to supply power to the chip, and under the condition that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage, the higher potential of the first power supply voltage and the second power supply voltage is selected to supply power to the chip, so that the normal work of a later-stage circuit can be ensured, the power consumption of the circuit can be reduced, and the light load efficiency of the circuit is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic block diagram of a power supply circuit according to an embodiment of the present invention;
fig. 2 shows a schematic circuit diagram of a control circuit in a power supply circuit according to an embodiment of the invention;
fig. 3 shows a schematic circuit diagram of a power circuit in a power supply circuit according to an embodiment of the invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements are denoted by like reference numerals throughout the various figures. For clarity, the various features of the drawings are not drawn to scale. Furthermore, some well-known portions may not be shown in the drawings.
Numerous specific details of the invention, such as construction, materials, dimensions, processing techniques and technologies, may be set forth in the following description in order to provide a thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It should be understood that in the following description, "circuit" refers to an electrically conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or being "connected between" two nodes, it can be directly coupled or connected to the other element or intervening elements may be present, the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, it means that there are no intervening elements present between the two.
Fig. 1 shows a schematic block diagram of a power supply circuit according to an embodiment of the present invention. As shown in fig. 1, the power supply circuit 100 includes a control circuit 110 and a power circuit 120. The control circuit 110 is connected to the BUS terminal and the SYS terminal to receive the first supply voltage Vbus and the second supply voltage Vsys, respectively, and the control circuit 110 is configured to compare the first supply voltage Vbus with the second supply voltage Vsys to obtain a first comparison signal, determine the lower potential of the first supply voltage Vbus and the second supply voltage Vsys according to the first comparison signal, and compare the lower potential of the first supply voltage Vbus and the second supply voltage Vsys with a preset reference voltage to obtain a second comparison signal, and finally generate a control signal Vctrl according to the first comparison signal and the second comparison signal. The power circuit 120 is controlled by the control signal Vctrl to convert the first power supply voltage Vbus or the second power supply voltage Vsys into an output voltage Vregn, which is an operation voltage of the subsequent circuit.
Wherein, the power circuit 120 is configured to generate the output voltage Vregn according to the lower potential of the first supply voltage Vbus and the second supply voltage Vsys when the lower potential of the first supply voltage Vbus and the second supply voltage Vsys is greater than the preset reference voltage; in the case where the lower potential of the first and second supply voltages Vbus and Vsys is smaller than the preset reference voltage, the output voltage Vregn is generated according to the higher potential of the first and second supply voltages Vbus and Vsys. The preset reference voltage is set according to the lowest operating voltage of the rear-stage circuit, for example, so that the output voltage can be generated according to the higher voltage of the first power supply voltage Vbus and the second power supply voltage Vsys under the condition that the lowest voltage of the first power supply voltage Vbus and the second power supply voltage Vsys is smaller than the reference voltage, the normal operation of the rear-stage circuit is ensured, and the output voltage can be generated according to the lowest voltage of the first power supply voltage Vbus and the second power supply voltage Vsys under the condition that the lowest voltage of the first power supply voltage Vbus and the second power supply voltage Vsys is larger than the reference voltage, the normal operation of the rear-stage circuit can be ensured, the power consumption of the circuit can be reduced, and the light load efficiency of the circuit is improved.
Fig. 2 shows that, as shown in fig. 2, in the power supply circuit according to the embodiment of the present invention, the control circuit 110 includes a voltage division module 101, a comparison selection module 102, a comparator CMP1, and an output module 103. The voltage dividing module 101 obtains a first voltage dividing signal V1 and a second voltage dividing signal V2 according to the first supply voltage Vbus and the second supply voltage Vsys, respectively. The comparison selection module 102 is configured to compare the first divided voltage signal V1 and the second divided voltage signal V2 to generate a first comparison signal Va and a first voltage signal Vx, where the first voltage signal Vx is used to characterize the lower of the first supply voltage Vbus and the second supply voltage Vsys. The non-inverting input terminal of the comparator CMP1 receives the first voltage signal Vx, the inverting input terminal receives the reference voltage signal Vref representing the preset reference voltage, and the comparator CMP1 is configured to compare the first voltage signal Vx with the reference voltage signal Vref to generate the second comparison signal Vb. The output module 103 has a first input terminal receiving the first comparison signal Va, a second input terminal receiving the second comparison signal Vb, and an output terminal for outputting the control signal Vctrl.
Further, the comparison selection module 102 includes a comparator CMP2, a switch S1, and a switch S2. The inverting input terminal of the comparator CMP2 receives the first divided signal V1, the non-inverting input terminal receives the second divided signal V2, and the output terminal outputs the first comparison signal Va. The switch S1 is connected between the first voltage division signal V1 and the output terminal of the first voltage signal Vx, and the switch S2 is connected between the second voltage division signal V2 and the output terminal of the first voltage signal Vx. The switch S1 and the switch S2 are controlled by the first comparison signal Va, and the switch S1 and the switch S2 are not turned on at the same time. For example, when the first comparison signal Va is at a logic high level, the switch S1 is turned on, the switch S2 is turned off, the first voltage signal Vx is equal to the first voltage division signal V1, and when the first comparison signal Va is at a logic low level, the switch S1 is turned off, the switch S2 is turned on, and the first voltage signal Vx is equal to the second voltage division signal V2.
Further, the output module 103 is implemented, for example, by an exclusive nor gate XNOR, and the output control signal Vctrl is at a logic low level when one and only one of the first comparison signal Va and the second comparison signal Vb are at a logic low level, and the output control signal Vctrl is at a logic high level when the levels of the first comparison signal Va and the second comparison signal Vb are the same.
Fig. 3 shows a schematic circuit diagram of a power circuit of a power supply circuit according to an embodiment of the invention. As shown in fig. 3, the power circuit 120 includes a first conversion module 121, a second conversion module 122, and a switch S3. The first conversion module 121 and the second conversion module 122 are implemented, for example, by LDO, the first conversion module 121 is configured to convert the first power supply voltage Vbus into the first conversion voltage Vo1, and the second conversion module 122 is configured to convert the second power supply voltage Vsys into the second conversion voltage Vo2. The first input terminal of the switch S3 is connected to the output terminal of the first conversion module 121, and the second input terminal is connected to the output terminal of the second conversion module 122. The switch S3 is, for example, a two-way switch, when the control signal Vctrl is at a logic high level, the switch S3 turns on the first input terminal to obtain the output voltage Vregn according to the first conversion voltage Vo1, and when the control signal Vctrl is at a logic low level, the switch S3 turns on the second input terminal to obtain the output voltage Vregn according to the second conversion voltage Vo2.
It should be noted that, the implementation of the switch S3 is not limited to this embodiment, and a person skilled in the art may implement the switch S3 by a bipolar type one-for-two switch or a MOS type one-for-two switch, or may implement the switch S3 by a pair of transistors that are complementarily turned on.
Table 1 shows a schematic control logic diagram of the power supply circuit of the present invention. In table 1, a logic high level is represented by "1", a logic low level is represented by "0", when the switch S3 is "ON", the switch S3 turns ON the first input terminal and the output terminal, and when the switch S3 is "OFF", the switch S3 turns ON the second input terminal and the output terminal.
TABLE 1
In the power supply circuit of the present invention, the voltage dividing module outputs the divided voltage signals of the first power supply voltage Vbus and the second power supply voltage Vsys to the comparator CMP2 for comparison, the lower potential of the two is supplied to the non-inverting input terminal of the comparator CMP1 through the switch S1 and the switch S2 according to the comparison result, that is, the first voltage signal vx=min (V1, V2), the comparator CMP1 compares the first voltage signal Vx with the reference voltage signal Vref, by setting an appropriate reference voltage, it can be determined whether the lower one of the first power supply voltage Vbus and the second power supply voltage Vsys can make the output voltage Vregn reach the preset reference value (for example, 5V), if so, the lower one of the first power supply voltage Vbus and the second power supply voltage Vsys is selected to supply power to the power circuit, and if not, the higher one of the first power supply voltage Vbus and the second power supply voltage Vsys is selected to supply the power circuit.
The power supply circuit of the embodiment preferentially ensures that the output voltage Vregn can reach the highest voltage value under the current condition, and optimizes the power consumption of the power supply circuit on the premise. That is, when at least one of the first power supply voltage Vbus and the second power supply voltage Vsys cannot enable the output voltage Vregn to reach a preset reference value, the LDO at the end with the higher voltage is selected to supply power to the chip, so that the output voltage Vregn can reach the highest voltage under the current condition; when the first power supply voltage Vbus and the second power supply voltage Vsys can both enable the output voltage Vregn to reach a preset reference value, the LDO where one end with lower voltage is located is selected to supply power for the chip, so that the power consumption of the circuit is reduced, and the light load efficiency of the circuit is improved.
In summary, in the power supply circuit and the power supply method according to the embodiments of the present invention, the power supply circuit includes a control circuit and a power circuit, the control circuit is configured to compare a first power supply voltage with a second power supply voltage, determine a lower potential of the first power supply voltage and the second power supply voltage according to a first comparison result, compare the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage, obtain a second comparison result, and control switching of a power supply terminal of the power circuit according to the first comparison result and the second comparison result. Under the condition that the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage, the lower potential of the first power supply voltage and the second power supply voltage is selected to supply power to the chip, and under the condition that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage, the higher potential of the first power supply voltage and the second power supply voltage is selected to supply power to the chip, so that the normal work of a later-stage circuit can be ensured, the power consumption of the circuit can be reduced, and the light load efficiency of the circuit is improved.
It should be noted that in this document relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (9)
1. A power supply circuit for providing an output voltage to a post-circuit, comprising:
a control circuit, comprising: the voltage division module is used for obtaining a first voltage division signal and a second voltage division signal according to the first power supply voltage and the second power supply voltage respectively; a comparison selection module for comparing the first divided voltage signal and the second divided voltage signal to generate a first comparison signal and a first voltage signal, the first voltage signal being used to characterize the lower of the first supply voltage and the second supply voltage; the non-inverting input end of the first comparator receives the first voltage signal, the inverting input end of the first comparator receives a reference voltage signal representing a preset reference voltage for comparison, and the output end of the first comparator outputs a second comparison signal; the output module is used for receiving the first comparison signal at a first input end, receiving the second comparison signal at a second input end and outputting a control signal at an output end; and
a power circuit controlled by the control signal to convert the first supply voltage or the second supply voltage into the output voltage,
the power circuit is used for generating the output voltage according to the lower potential of the first power supply voltage and the second power supply voltage under the condition that the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage; and
and generating the output voltage according to the higher potential of the first power supply voltage and the second power supply voltage under the condition that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage.
2. The power supply circuit of claim 1, wherein the comparison selection module comprises:
the non-inverting input end of the second comparator receives the second divided signal, the inverting input end of the second comparator receives the first divided signal, and the output end of the second comparator outputs the first comparison signal;
the first switch is connected between the first voltage division signal and the output end of the first voltage signal; and
a second switch connected between the second voltage division signal and the output end of the first voltage signal,
the first switch and the second switch are controlled by the first comparison signal, and the first switch and the second switch are not conducted at the same time.
3. The power supply circuit of claim 1, wherein the output module is configured to output the control signal to be at a logic low level when one and only one of the first comparison signal and the second comparison signal is at a logic low level; and
and outputting the control signal to be at a logic high level when the levels of the first comparison signal and the second comparison signal are the same.
4. A supply circuit according to claim 3, wherein the output module is implemented by an exclusive nor gate.
5. A supply circuit according to claim 3, wherein the power circuit is configured to generate the output voltage from the first supply voltage when the control signal is at a logic high level, and to generate the output voltage from the second supply voltage when the control signal is at a logic low level.
6. The power supply circuit of claim 5, wherein the power circuit comprises:
the first conversion module is used for converting the first power supply voltage into a first conversion voltage;
the second conversion module is used for converting the second power supply voltage into a second conversion voltage; and
and the first input end of the third switch is connected with the output end of the first conversion module, and the second input end of the third switch is connected with the output end of the second conversion module and is used for obtaining the output voltage according to the first conversion voltage when the control signal is at a logic high level and obtaining the output voltage according to the second conversion voltage when the control signal is at a logic low level.
7. The power supply circuit of claim 6, wherein the first and second conversion modules are implemented with a low dropout linear regulator.
8. The power supply circuit of claim 6, wherein the third switch is an alternative switch composed of MOS transistors.
9. A power supply method for providing an output voltage to a post-stage circuit, comprising:
obtaining a first voltage division signal and a second voltage division signal according to the first power supply voltage and the second power supply voltage respectively;
comparing the first divided voltage signal and the second divided voltage signal to generate a first comparison signal and a first voltage signal, the first voltage signal being used to characterize the lower of the first supply voltage and the second supply voltage;
comparing the first voltage signal with a reference voltage signal representing a preset reference voltage to generate a second comparison signal;
generating a control signal according to the first comparison signal and the second comparison signal; and
according to the control signal to convert the first supply voltage or the second supply voltage into the output voltage,
wherein the converting the first supply voltage or the second supply voltage into the output voltage according to the control signal includes:
generating the output voltage according to the lower potential of the first power supply voltage and the second power supply voltage under the condition that the control signal characterizes that the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage; and
and generating the output voltage according to the higher potential of the first power supply voltage and the second power supply voltage under the condition that the control signal characterizes that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage.
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| TW200700955A (en) * | 2005-06-17 | 2007-01-01 | Ite Tech Inc | Bandgap reference circuit |
| CN1960152A (en) * | 2005-11-02 | 2007-05-09 | 鸿富锦精密工业（深圳）有限公司 | Source transfer circuit, and power supply system of using the circuit |
| CN101557122A (en) * | 2009-02-24 | 2009-10-14 | 深圳市民展科技开发有限公司 | Duplicate supply selection circuit |
| CN202363968U (en) * | 2011-12-14 | 2012-08-01 | 陕西千山航空电子有限责任公司 | Dual-power input selection and power reverse connection prevention circuit |
| TWM465721U (en) * | 2013-06-19 | 2013-11-11 | Richtek Technology Corp | Bi-directional switching regulator and control circuit thereof |
| CN203812136U (en) * | 2013-11-28 | 2014-09-03 | 苏州贝克微电子有限公司 | Low-power real-time clock circuit with system and battery electric quantity arbitration function |
| CN203950230U (en) * | 2014-07-14 | 2014-11-19 | 衢州市沃思电子技术有限公司 | The electrical source exchange module of reference source |
| CN105988498A (en) * | 2015-03-06 | 2016-10-05 | 展讯通信（上海）有限公司 | Low voltage self-adapting power source system |
| CN212033826U (en) * | 2020-03-11 | 2020-11-27 | 深圳绿米联创科技有限公司 | Power supply circuit and electronic device |
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