CN117811183A - Power supply circuit applied to multi-power supply system - Google Patents

Power supply circuit applied to multi-power supply system Download PDF

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Publication number
CN117811183A
CN117811183A CN202311845486.4A CN202311845486A CN117811183A CN 117811183 A CN117811183 A CN 117811183A CN 202311845486 A CN202311845486 A CN 202311845486A CN 117811183 A CN117811183 A CN 117811183A
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CN
China
Prior art keywords
power supply
unit
external power
internal
mos transistor
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CN202311845486.4A
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Chinese (zh)
Inventor
黄迪
陈春妃
杨兴洲
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Siruipu Microelectronics Technology Shanghai Co ltd
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Siruipu Microelectronics Technology Shanghai Co ltd
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Priority to CN202311845486.4A priority Critical patent/CN117811183A/en
Publication of CN117811183A publication Critical patent/CN117811183A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a power supply circuit applied to a multi-power supply system, the multi-power supply system comprises a plurality of external power supplies and an internal power supply, the internal power supply is a power supply of the internal circuit, and the power supply circuit comprises: the first switch unit is connected between a first external power supply and an internal power supply; a second switching unit connected between a second external power source and an internal power source; the switch control unit is respectively connected with the first switch unit and the second switch unit; and the charging unit is connected between the third external power supply and the internal power supply and is used for charging the internal power supply when the internal power supply is powered down so as to clamp the voltage of the internal power supply to a first preset voltage. The invention adopts the power supply with higher voltage in a plurality of external power supplies to generate the internal power supply for supplying power to the internal circuit, thereby improving the overall efficiency of the system, reducing the chip area and being applicable to more application scenes.

Description

Power supply circuit applied to multi-power supply system
Technical Field
The invention belongs to the technical field of integrated circuits, and particularly relates to a power supply circuit applied to a multi-power supply system.
Background
In a wide-input dual-power or multi-power system, the minimum input voltage of an external power supply is required to be supported below 2V, and other external power supplies of the system are sometimes lower than the maximum operable V of components such as a power tube GS A voltage.If other power supplies are directly used for supplying power, the on-resistance of the power tube is larger, which is not beneficial to the whole efficiency or the chip miniaturization.
Accordingly, in view of the above-mentioned technical problems, it is necessary to provide a power supply circuit applied to a multi-power supply system.
Disclosure of Invention
In view of the above, the present invention is directed to a power supply circuit applied to a multi-power system to generate an internal circuit power supply with a voltage as high as possible, optimize the overall efficiency and reduce the chip area.
In order to achieve the above object, an embodiment of the present invention provides the following technical solution:
a power supply circuit applied to a multi-power supply system, the multi-power supply system including a plurality of external power supplies and an internal power supply, the internal power supply being a power supply of an internal circuit, the power supply circuit comprising:
the first switch unit is connected between a first external power supply and an internal power supply;
a second switching unit connected between a second external power source and an internal power source;
the switch control unit is respectively connected with the first switch unit and the second switch unit, and is used for controlling the first switch unit to be conducted when the voltage of the first external power supply is larger than that of the second external power supply, controlling the second switch unit to be conducted when the voltage of the first external power supply is smaller than that of the second external power supply, and controlling the first switch unit and/or the second switch unit to be conducted when the voltage of the first external power supply is equal to that of the second external power supply;
and the charging unit is connected between the third external power supply and the internal power supply and is used for charging the internal power supply when the internal power supply is powered down so as to clamp the voltage of the internal power supply to a first preset voltage.
In an embodiment, the first switch unit includes a first MOS tube and a second MOS tube, a second end of the first MOS tube is connected to a first external power supply, a first end of the first MOS tube is connected to a second end of the second MOS tube, a control end of the first MOS tube is connected to the driving unit, a first end of the second MOS tube is connected to an internal power supply, and a control end of the second MOS tube is connected to the switch control unit;
the second switch unit comprises a third MOS tube and a fourth MOS tube, the second end of the third MOS tube is connected with a second external power supply, the first end of the third MOS tube is connected with the second end of the fourth MOS tube, the control end of the third MOS tube is connected with the driving unit, the first end of the fourth MOS tube is connected with the internal power supply, and the control end of the fourth MOS tube is connected with the switch control unit.
In one embodiment, the switch control unit includes a signal comparison unit and a logic control unit, wherein:
the input end of the signal comparison unit is respectively connected with a second external power supply and a first external power supply, and the output end of the signal comparison unit is connected with the control end of the second MOS tube;
the logic control unit is connected between the output end of the signal comparison unit and the control end of the fourth MOS tube.
In an embodiment, the signal comparing unit includes a comparator, where a first input end and a second input end are connected to a second external power supply and a first external power supply, respectively, and an output end is connected to a control end of the second MOS transistor;
the logic control unit comprises an inverter, the input end of the inverter is connected with the output end of the comparator, and the output end of the inverter is connected with the control end of the fourth MOS tube.
In an embodiment, the charging unit includes a rectifying device with a unidirectional current flowing from a first end to a second end, the first end of the rectifying device is connected to a third external power source, and the second end of the rectifying device is connected to an internal power source.
In one embodiment, the power supply circuit further includes:
and the discharging unit is connected between the internal power supply and the reference potential and is used for discharging the internal power supply when the voltage of the internal power supply is greater than a second preset voltage.
In an embodiment, the discharging unit includes a fifth MOS transistor, a sixth MOS transistor, and a resistor, where a first end of the fifth MOS transistor is connected to the internal power supply, a second end of the fifth MOS transistor is connected to a first end of the resistor, a second end of the resistor is connected to the reference potential, and a first end of the sixth MOS transistor is connected to the reference potential, and a second end of the sixth MOS transistor is connected to the internal power supply.
In an embodiment, the power supply circuit further includes a clamping unit, the clamping unit includes a seventh MOS transistor and a diode, the control end and the second end of the seventh MOS transistor are both connected to the driving unit, the first end is connected to the cathode of the diode, and the anode of the diode is connected to the reference potential.
In one embodiment, the driving unit is a charge pump; and/or the number of the groups of groups,
the diode is a zener diode.
In one embodiment, the multi-power system includes a plurality of first external power sources with different voltages, and a first switch unit is arranged between each first external power source and each internal power source; and/or the number of the groups of groups,
the multi-power supply system comprises a plurality of second external power supplies with different voltages, and a second switch unit is arranged between each second external power supply and each internal power supply; and/or the number of the groups of groups,
the third external power supply and the first external power supply or the second external power supply are the same power supply.
The invention has the following beneficial effects:
the invention adopts the power supply with higher voltage in a plurality of external power supplies to generate the internal power supply for supplying power to the internal circuit, thereby improving the overall efficiency of the system, reducing the chip area and being applicable to more application scenes.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power supply circuit according to the present invention;
fig. 2 is a circuit diagram of a power supply circuit according to an embodiment of the invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the description herein, unless otherwise specified and defined, the terms "coupled" and "connected" are to be construed broadly, and for example, may be directly coupled or indirectly coupled through an intermediary, as the particular meaning of such terms would be understood to one of ordinary skill in the art in view of the circumstances.
The invention discloses a power supply circuit applied to a multi-power supply system.
Illustratively, the present invention is described with reference to three external power sources, namely, a first external power source (i.e., input power source VIN), a second external power source (i.e., power supply VCC), and a third external power source (i.e., VDD), and further includes a power supply of an internal circuit; the internal power supply (i.e., PVDD) is a power supply for internal circuits (driving circuits, power transistors, etc.).
Referring to fig. 1, the power supply circuit of the present invention includes:
the first switch unit S1 is connected between the first external power source VIN and the internal power source PVDD;
a second switching unit S2 connected between the second external power source VCC and the internal power source PVDD;
the switch control unit is respectively connected with the first switch unit S1 and the second switch unit S2, and controls the first switch unit S1 to be conducted when the voltage of the first external power supply VIN is larger than the voltage of the second external power supply VCC, controls the second switch unit S2 to be conducted when the voltage of the first external power supply VIN is smaller than the voltage of the second external power supply VCC, and controls the first switch unit S1 and/or the second switch unit S2 to be conducted when the voltage of the first external power supply VIN is equal to the voltage of the second external power supply VCC;
and a charging unit (Fast Charge) S3, connected between the third external power supply VDD and the internal power supply PVDD, configured to Charge the internal power supply when the internal power supply PVDD is powered down, so as to clamp the voltage of the internal power supply to a first preset voltage, where the magnitude of the first preset voltage can be designed according to actual needs.
The switch control unit comprises a signal comparison unit (VIN/VCC Select) and a Logic control unit (Logic). The input end of the signal comparison unit is respectively connected with a second external power supply VCC and a first external power supply VIN, the output end of the signal comparison unit is connected with a first switch unit S1, and the signal comparison unit is used for comparing VIN and VCC to generate a comparison signal low_vin for controlling the first switch unit S1; the logic control unit is connected between the output end of the signal comparison unit and the second switch unit S2, and is configured to generate a control signal that controls the second switch unit S2 and is opposite to the low_vin according to the comparison signal low_vin.
Preferably, the power supply circuit of the present invention further includes a driving unit, preferably a Charge Pump (Charge Pump), for generating the driving voltage VCCH for controlling the partial switching tubes of the first switching unit S1 and the second switching unit S2. Of course, the driving unit may also employ other boost circuits to generate the driving voltage VCCH.
Preferably, the power supply circuit of the present invention includes a discharging unit (PVDD discharging) connected between the internal power supply PVDD and the reference potential, for discharging the internal power supply PVDD when the voltage of the internal power supply PVDD is greater than a second preset voltage, and the second preset voltage can be designed according to actual needs.
The reference potential in the present invention will be described with reference to the ground potential (GND).
Further, the power supply circuit of the present invention further includes a clamping unit (PVDD/VCCH Clamp) connected between the driving voltage VCCH and the reference potential to further Clamp the voltage of the internal power supply PVDD.
Preferably, an output capacitor C1 is also connected between the internal power supply PVDD and the reference potential. In other embodiments, the output capacitor C1 may be replaced by a MOS capacitor or the like.
When the system directly uses a higher external power supply to generate an internal power supply, the voltage withstand value of the circuit may be exceeded, so that the reliability problem is caused, and the PVDD can be ensured not to exceed the voltage withstand value of the circuit at the moment by adding the discharging unit and the clamping unit.
When power is supplied to an internal circuit (a driving circuit, a power tube and the like) in a multi-power system, a relatively low external power supply VCC is directly used for supplying power, so that a relatively high on-resistance is obtained, and the efficiency of the whole system is reduced. It is therefore necessary to increase the supply voltage of the internal power supply PVDD as much as possible while ensuring reliability. When VIN is larger than VCC, PVDD is powered by VIN, when VIN is smaller than VCC, PVDD is powered by VCC, when VIN is equal to VCC, VIN or VCC can be selected to be powered, and the working range of the input voltage (namely VIN) of the system is improved.
The specific working principle is as follows:
when the voltage of the first external power source VIN is higher than the voltage of the second external power source VCC, the comparison signal low_vin generated by the signal comparison unit (VIN/VCC Select) controls the first switching unit S1 of VIN to PVDD to be turned on, and the second switching unit S2 of VCC to PVDD to be turned off, and the voltage of the internal power source PVDD is limited by VCCH and VIN.
The clamping unit (PVDD/VCCH Clamp) clamps the VCCH voltage to ensure that the PVDD voltage does not exceed a preset voltage value and prevent the overvoltage of a later-stage circuit. If the voltage of the PVDD is over-charged due to the interference, the discharging unit (PVDD discharging) can Discharge the PVDD, so that the risk of over-voltage of the PVDD is further reduced.
When the load current of the PVDD is rapidly hopped, the first switch unit S1 and the output capacitor C1 may not provide enough Charge, and the charging unit (Fast Charge) S3 may instantaneously Charge the PVDD from VDD (VDD may also be the same power supply as VCC or VIN), so as to clamp the PVDD at a preset voltage value, thereby avoiding the working error of the later-stage circuit caused by too low PVDD voltage.
When the voltage of the second external power supply VCC is higher than that of the first external power supply VIN, the comparison signal low_vin generated by the signal comparison unit (VIN/VCC Select) generates another control signal to control the second switching unit from VCC to PVDD to be turned on after passing through the Logic control unit (Logic), and the first switching unit S1 from VIN to PVDD is turned off, at this time, the PVDD voltage is limited by VCCH and VIN. Similarly, the operation of the clamping unit, the discharging unit, the charging unit, and the like is similar to that described above, and a detailed description thereof will be omitted.
Referring to fig. 2, a circuit diagram of a power supply circuit according to an embodiment of the present invention is shown, and a detailed description of a specific implementation circuit of each unit is described below.
The driving unit in this embodiment is a Charge Pump (Charge Pump) for generating the driving voltage VCCH.
The first switching unit S1 in this embodiment includes a first MOS transistor M1 and a second MOS transistor M2, where a second end of the first MOS transistor M1 is connected to the first external power source VIN, a first end of the first MOS transistor M2 is connected to a second end of the second MOS transistor M2, a control end of the first MOS transistor M2 is connected to the VCCH generated by the charge pump, a first end of the second MOS transistor M2 is connected to the internal power source PVDD, and a control end of the second MOS transistor M2 is connected to the switch control unit.
The second switch unit S2 includes a third MOS transistor M3 and a fourth MOS transistor M4, where a second end of the third MOS transistor M3 is connected to the second external power source VCC, a first end is connected to a second end of the fourth MOS transistor M4, a control end is connected to the VCCH generated by the charge pump, a first end of the fourth MOS transistor M4 is connected to the internal power source PVDD, and a control end is connected to the switch control unit.
The first MOS transistor M1 and the third MOS transistor M3 are NMOS transistors, the second MOS transistor M2 and the fourth MOS transistor M4 are PMOS transistors, the first ends are both sources, the second ends are both drains, and the control ends are both gates, respectively.
The switch control unit in this embodiment includes a signal comparison unit and a logic control unit, wherein:
the signal comparison unit (VIN/VCC Select) is a comparator, the first input end and the second input end are respectively connected with the second external power supply VCC and the first external power supply VIN, and the output end is connected with the control end of the second MOS tube M2 and is used for outputting a comparison signal low_vin;
the Logic control unit (Logic) is an inverter, the input end of the Logic control unit is connected with the output end (namely, the comparison signal low_vin) of the comparator, the output end of the Logic control unit is connected with the control end of the fourth MOS tube M4, and the control signal output by the output end is an inverse signal of the low_vin.
When VIN is larger than VCC, the comparison signal low_vin is low level, the second MOS tube M2 is controlled to be conducted, the control signal which is outputted after the low_vin is inverted by the inverter is high level, and the fourth MOS tube M4 is controlled to be turned off; when VIN is smaller than VCC, the comparison signal low_vin is high level, which controls the second MOS transistor M2 to be turned off, and the control signal output after the inversion of the low_vin through the inverter is low level, which controls the fourth MOS transistor M4 to be turned on.
In this embodiment, the charging unit (Fast Charge) S3 is a diode D1 with unidirectional conduction, the anode is connected to the third external power supply VDD, and the cathode is connected to the internal power supply PVDD.
The discharging unit (PVDD discharging) in this embodiment includes a fifth MOS transistor M5, a sixth MOS transistor M6, and a resistor R1, where a first end of the fifth MOS transistor M5 is connected to the internal power PVDD, a second end of the fifth MOS transistor M5 is connected to a first end of the resistor R1, a second end of the resistor R1 is connected to the reference potential, a first end of the sixth MOS transistor M6 is connected to the reference potential, and a second end of the sixth MOS transistor M6 is connected to the internal power PVDD.
The fifth MOS transistor M5 is a PMOS transistor, the sixth MOS transistor M6 is an NMOS transistor, the first ends are all sources, the second ends are all drains, and the control ends are all gates, for example.
The clamping unit (PVDD/VCCH Clamp) in this embodiment includes a seventh MOS transistor M7 and a diode D2, where the control end and the second end of the seventh MOS transistor M7 are connected to VCCH, the first end is connected to the cathode of the diode D2, and the anode of the diode is connected to the reference potential.
Illustratively, the seventh MOS transistor M7 is an NMOS transistor, a first end of which is a source, a second end of which is a drain, and a control end of which is a gate; the diode D2 is a zener diode.
Preferably, in this embodiment, the control end of the fifth MOS transistor is connected to the first end of the seventh MOS transistor, and the voltage inside the clamping unit is used as the driving voltage of the fifth MOS transistor M5.
The working principle of the power supply circuit in this embodiment is as follows:
m1 and M2 form a path for charging PVDD from VIN, M3 and M4 form a path for charging PVDD from VCC, and diode D1 connecting VDD and PDD forms a fast charge path.
When VIN is higher than VCC, S1 is turned on, S2 is turned off, PVDD is a smaller value between (VCCH-Vgs 1) and VIN, and Vgs1 is the gate-source voltage of M1; when VCC is higher than VIN, S2 is on, S1 is off, PVDD is a smaller value between VCCH-Vgs3 and VCC, and Vgs3 is the gate-source voltage of M3.
When the load current of the PVDD is greatly hopped quickly, the fast charge path can clamp the PVDD at (VDD-VD), which is the on-voltage drop of the diode D1.
It should be understood that the specific circuits of the units in this embodiment are only examples, and in other embodiments, the same function may be implemented by other different circuits, for example, the charging unit may use other unidirectional rectifying devices, the comparator may use other circuits to implement the comparison between the two voltages, the inverter may use other circuits to implement the conversion of the control signal, and so on, which are not illustrated herein.
It should be noted that, in the above embodiment, three external power sources are taken as an example, and in other embodiments, the third external power source VDD may be replaced by the first external power source VIN or the second external power source VCC, the number of the first external power source VIN and the second external power source VCC is not limited to one, and may be plural, and when the external power source VIN or VCC is plural, the corresponding switching units S1 or S2 are also plural, which is not illustrated here.
The technical scheme shows that the invention has the following beneficial effects:
the invention adopts the power supply with higher voltage in a plurality of external power supplies to generate the internal power supply for supplying power to the internal circuit, thereby improving the overall efficiency of the system, reducing the chip area and being applicable to more application scenes.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (10)

1. A power supply circuit for a multi-power supply system, the multi-power supply system comprising a plurality of external power supplies and an internal power supply, the internal power supply being a power supply of the internal circuit, the power supply circuit comprising:
the first switch unit is connected between a first external power supply and an internal power supply;
a second switching unit connected between a second external power source and an internal power source;
the switch control unit is respectively connected with the first switch unit and the second switch unit, and is used for controlling the first switch unit to be conducted when the voltage of the first external power supply is larger than that of the second external power supply, controlling the second switch unit to be conducted when the voltage of the first external power supply is smaller than that of the second external power supply, and controlling the first switch unit and/or the second switch unit to be conducted when the voltage of the first external power supply is equal to that of the second external power supply;
and the charging unit is connected between the third external power supply and the internal power supply and is used for charging the internal power supply when the internal power supply is powered down so as to clamp the voltage of the internal power supply to a first preset voltage.
2. The power supply circuit for a multi-power supply system according to claim 1, wherein the first switching unit comprises a first MOS transistor and a second MOS transistor, the second end of the first MOS transistor is connected to a first external power supply, the first end is connected to the second end of the second MOS transistor, the control end is connected to the driving unit, the first end of the second MOS transistor is connected to an internal power supply, and the control end is connected to the switching control unit;
the second switch unit comprises a third MOS tube and a fourth MOS tube, the second end of the third MOS tube is connected with a second external power supply, the first end of the third MOS tube is connected with the second end of the fourth MOS tube, the control end of the third MOS tube is connected with the driving unit, the first end of the fourth MOS tube is connected with the internal power supply, and the control end of the fourth MOS tube is connected with the switch control unit.
3. The power supply circuit applied to the multi-power supply system according to claim 2, wherein the switch control unit comprises a signal comparison unit and a logic control unit, wherein:
the input end of the signal comparison unit is respectively connected with a second external power supply and a first external power supply, and the output end of the signal comparison unit is connected with the control end of the second MOS tube;
the logic control unit is connected between the output end of the signal comparison unit and the control end of the fourth MOS tube.
4. The power supply circuit for a multi-power supply system according to claim 3, wherein the signal comparing unit comprises a comparator, the first input terminal and the second input terminal are respectively connected with the second external power supply and the first external power supply, and the output terminal is connected with the control terminal of the second MOS transistor;
the logic control unit comprises an inverter, the input end of the inverter is connected with the output end of the comparator, and the output end of the inverter is connected with the control end of the fourth MOS tube.
5. The power supply circuit for a multi-power supply system according to claim 1, wherein the charging unit includes a rectifying device through which current flows unidirectionally from a first end to a second end, the first end of the rectifying device being connected to a third external power supply, and the second end being connected to an internal power supply.
6. The power supply circuit for a multiple power supply system according to claim 1, further comprising:
and the discharging unit is connected between the internal power supply and the reference potential and is used for discharging the internal power supply when the voltage of the internal power supply is greater than a second preset voltage.
7. The power supply circuit for a multiple power supply system according to claim 6, wherein the discharge unit comprises a fifth MOS transistor, a sixth MOS transistor, and a resistor, the first end of the fifth MOS transistor is connected to the internal power supply, the second end of the fifth MOS transistor is connected to the first end of the resistor, the second end of the resistor is connected to the reference potential, the first end of the sixth MOS transistor is connected to the reference potential, and the second end of the sixth MOS transistor is connected to the internal power supply.
8. The power supply circuit for a multi-power supply system according to claim 1, further comprising a clamping unit, wherein the clamping unit comprises a seventh MOS transistor and a diode, the control end and the second end of the seventh MOS transistor are connected to the driving unit, the first end is connected to the cathode of the diode, and the anode of the diode is connected to the reference potential.
9. The power supply circuit applied to the multi-power supply system according to claim 8, wherein the driving unit is a charge pump; and/or the number of the groups of groups,
the diode is a zener diode.
10. The power supply circuit applied to the multi-power supply system according to claim 1, wherein the multi-power supply system comprises a plurality of first external power supplies of different voltages, and a first switching unit is provided between each of the first external power supplies and the internal power supply; and/or the number of the groups of groups,
the multi-power supply system comprises a plurality of second external power supplies with different voltages, and a second switch unit is arranged between each second external power supply and each internal power supply; and/or the number of the groups of groups,
the third external power supply and the first external power supply or the second external power supply are the same power supply.
CN202311845486.4A 2023-12-28 2023-12-28 Power supply circuit applied to multi-power supply system Pending CN117811183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311845486.4A CN117811183A (en) 2023-12-28 2023-12-28 Power supply circuit applied to multi-power supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311845486.4A CN117811183A (en) 2023-12-28 2023-12-28 Power supply circuit applied to multi-power supply system

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CN117811183A true CN117811183A (en) 2024-04-02

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Application Number Title Priority Date Filing Date
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