CN217335429U - Voltage self-adaptive power supply circuit, SD card power supply and electronic equipment - Google Patents

Abstract

The utility model discloses a voltage self-adaptation power supply circuit, SD card power and electronic equipment belongs to power supply circuit technical field. Wherein, this voltage adaptive power supply circuit includes: the power supply comprises a first power supply control module and a second power supply control module; the first power supply control module and the second power supply control module are used for realizing connection or disconnection of the target power supply end with the first power supply and the second power supply under the common control of the first power supply enabling signal and the second power supply enabling signal. The technical problem that two power supplies cannot be simultaneously turned off by controlling two power supplies through one signal at present is solved, hardware fool-proofing is achieved, and the risk of short circuit of electronic equipment is reduced.

Description

Voltage self-adaptive power supply circuit, SD card power supply and electronic equipment

Technical Field

The utility model relates to a power supply circuit technical field especially relates to a voltage self-adaptation power supply circuit, SD card power and electronic equipment.

Background

The power supply of some components used in current electronic devices is classified into different classes, for example, the power supply class of SD card is classified into two classes of 1.8V and 3.3V, and in order to be compatible with the two SD cards, the host power supply needs to have an adaptive function, and when the SD card is inserted, the power supply is switched between 1.8V and 3.3V. When the voltage is switched, a conflict problem is involved, for example, when the 3.3V power supply is turned on, if the 1.8V power supply is not turned off in time, the voltage can flow backwards, and the circuit is damaged. The current solution of the problem is to use the inversion of a signal to simultaneously control the 1.8V and 3.3V power supplies, for example, the 1.8V power supply is turned on at a high level, and the 3.3V power supply is turned on at a low level, so that the two power supplies do not conflict with each other.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide a voltage adaptive power circuit, an SD card power supply and an electronic device, so as to solve the technical problem that two power supplies cannot be turned off simultaneously when two power supplies are controlled by one signal.

The utility model provides an above-mentioned technical problem adopted technical scheme as follows:

according to an aspect of an embodiment of the present invention, there is provided a voltage adaptive power supply circuit including a first power supply control module and a second power supply control module;

the first control end and the second control end of the first power control module are respectively connected with a first power enable signal and a second power enable signal, and the power input end and the power output end of the first power control module are respectively connected with a first power supply and a target power supply end;

a first control end and a second control end of the second power control module are respectively connected with a second power enable signal and a first power enable signal, and a power input end and a power output end of the second power control module are respectively connected with a second power supply and the target power supply end;

the first power supply control module and the second power supply control module are used for realizing connection or disconnection of the target power supply end with the first power supply and the second power supply under the common control of the first power supply enabling signal and the second power supply enabling signal.

Optionally, the first power control module includes a first control unit and a first switch unit;

the first control end and the second control end of the first control unit are respectively connected with a first power supply enabling signal and a second power supply enabling signal, the output end of the first control unit is connected with the control end of the first switch unit, and the power supply input end and the power supply output end of the first switch unit are respectively connected with the first power supply and the target power supply end.

Optionally, the first control unit includes a first switch, a second switch, a first resistor, and a second resistor;

the first switch comprises a first NPN type triode, the second switch comprises a second NPN type triode, the base electrode of the first NPN type triode is connected with the first power supply enabling signal through the first resistor, the collector electrode of the first NPN type triode is connected with the control end of the first switch unit, the emitter electrode of the first NPN type triode is grounded, the base electrode of the second NPN type triode is connected with the second power supply enabling signal through the second resistor, the collector electrode of the second NPN type triode is connected with the base electrode of the first NPN type triode, and the emitter electrode of the second NPN type triode is grounded.

Optionally, the first switching unit includes a third switch, a fourth switch and a third resistor;

the third switch comprises a first P-channel MOS tube, the fourth switch comprises a second P-channel MOS tube, the drain electrode of the first P-channel MOS tube is connected with the first power supply, the source electrode of the first P-channel MOS tube is respectively connected with the source electrode of the second P-channel MOS tube and one end of the third resistor, the drain electrode of the second P-channel MOS tube is connected with the target power supply end, and the grid electrode of the first P-channel MOS tube, the grid electrode of the second P-channel MOS tube and the other end of the third resistor are connected with the collector electrode of the first NPN type triode.

Optionally, the second power control module includes a second control unit and a second switch unit;

the first control end and the second control end of the second control unit are respectively connected with a second power supply enabling signal and a first power supply enabling signal, the output end of the second control unit is connected with the control end of the second switch unit, and the power supply input end and the power supply output end of the second switch unit are respectively connected with the second power supply and the target power supply end.

Optionally, the second control unit includes a fifth switch, a sixth switch, a fourth resistor, and a fifth resistor;

the fifth switch comprises a third NPN type triode, the sixth switch comprises a fourth NPN type triode, a base of the third NPN type triode is connected with the second power enable signal through a fourth resistor, a collector of the third NPN type triode is connected with the control end of the second switch unit, an emitter of the third NPN type triode is grounded, a base of the fourth NPN type triode is connected with the first power enable signal through the fifth resistor, a collector of the fourth NPN type triode is connected with the base of the third NPN type triode, and an emitter of the fourth NPN type triode is grounded.

Optionally, the second switch unit comprises a seventh switch, an eighth switch and a sixth resistor;

the seventh switch comprises a third P-channel MOS transistor, the eighth switch comprises a fourth P-channel MOS transistor, a drain of the third P-channel MOS transistor is connected with the second power supply, a source of the third P-channel MOS transistor is respectively connected with a source of the fourth P-channel MOS transistor and one end of the sixth resistor, a drain of the fourth P-channel MOS transistor is connected with the target power supply end, and a gate of the third P-channel MOS transistor, a gate of the fourth P-channel MOS transistor, and the other end of the sixth resistor are connected with a collector of the third NPN-type triode.

Optionally, the enabling connection or disconnection of the target power source end to the first power source and the second power source under the common control of the first power source enable signal and the second power source enable signal by the first power source control module and the second power source control module includes:

when the first power supply enabling signal is effective and the second power supply enabling signal is ineffective, closing the connection between the first power supply and the target power supply end, and disconnecting the connection between the second power supply and the target power supply end;

when the first power supply enabling signal is invalid and the second power supply enabling signal is valid, disconnecting the first power supply from the target power supply end and closing the second power supply from the target power supply end;

and when the first power supply enabling signal and the second power supply enabling signal are both effective or both ineffective, simultaneously disconnecting the first power supply from the target power supply end and the second power supply from the target power supply end.

According to another aspect of the embodiments of the present invention, there is provided an SD card power supply including the above voltage adaptive power supply circuit.

According to another aspect of the embodiments of the present invention, there is provided an electronic apparatus including the voltage adaptive power supply circuit described above.

The embodiment of the utility model provides a voltage self-adaptation power supply circuit, SD card power and electronic equipment include in: the power supply comprises a first power supply control module and a second power supply control module; the first control end and the second control end of the first power control module are respectively connected with a first power enable signal and a second power enable signal, and the power input end and the power output end of the first power control module are respectively connected with a first power supply and a target power supply end; a first control end and a second control end of the second power control module are respectively connected with a second power enable signal and a first power enable signal, and a power input end and a power output end of the second power control module are respectively connected with a second power supply and the target power supply end; the first power supply control module and the second power supply control module are used for realizing connection or disconnection of the target power supply end with the first power supply and the second power supply under the common control of the first power supply enabling signal and the second power supply enabling signal. Therefore, the connection and disconnection of the first power supply and the second power supply with the target power supply end are controlled by the first power supply enabling signal and the second power supply enabling signal together, and the power supply corresponding to the effective enabling signal is closed and the power supply corresponding to the ineffective enabling signal is disconnected only when one of the power supply enabling signals is effective; and simultaneously disconnecting the two power supplies when the two power supply enabling signals are both effective or both ineffective. The technical problem that two power supplies cannot be simultaneously turned off by controlling the two power supplies through one signal at present is solved, hardware fool-proofing is realized, and the risk of short circuit of electronic equipment is reduced.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic diagram of an implementation of a voltage adaptive power supply circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit connection diagram of an implementation manner of a first power control module according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of an implementation manner of a second power control module according to an embodiment of the present invention.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

Example one

In order to solve the technical problem that two power supplies cannot be simultaneously turned off by controlling the two power supplies through one signal at present, the embodiment provides a voltage self-adaptive power supply circuit. Referring to fig. 1, fig. 1 is a schematic diagram of an implementation of a voltage adaptive power circuit according to an embodiment of the present invention, where the voltage adaptive power circuit includes a first power control module 1 and a second power control module 2; a first control end and a second control end of the first power control module 1 are respectively connected with a first power enable signal and a second power enable signal, and a power input end and a power output end of the first power control module 1 are respectively connected with a first power supply and a target power supply end; a first control end and a second control end of the second power control module 2 are respectively connected with a second power enable signal and a first power enable signal, and a power input end and a power output end of the second power control module 2 are respectively connected with a second power supply and the target power supply end; the first power control module 1 and the second power control module 2 are configured to implement connection or disconnection between the target power source end and the first power source and the second power source under common control of the first power enable signal and the second power enable signal.

Specifically, the step of enabling or disconnecting the target power source end from the first power source and the second power source under the common control of the first power source enable signal and the second power source enable signal by the first power source control module 1 and the second power source control module 2 includes: when the first power supply enabling signal is effective and the second power supply enabling signal is ineffective, closing the connection between the first power supply and the target power supply end, and disconnecting the connection between the second power supply and the target power supply end; when the first power supply enabling signal is invalid and the second power supply enabling signal is valid, disconnecting the first power supply from the target power supply end and closing the second power supply from the target power supply end; and when both the first power supply enable signal and the second power supply enable signal are valid or both are invalid, simultaneously disconnecting the first power supply from the target power supply terminal and disconnecting the second power supply from the target power supply terminal. Therefore, the connection and disconnection of the first power supply and the second power supply with the target power supply end are controlled by the first power supply enabling signal and the second power supply enabling signal together, and the power supply corresponding to the effective enabling signal is closed and the power supply corresponding to the ineffective enabling signal is disconnected only when one of the power supply enabling signals is effective; and simultaneously disconnecting the two power supplies when the two power supply enabling signals are both effective or both ineffective. The technical problem that two power supplies cannot be simultaneously turned off by controlling the two power supplies through one signal at present is solved, hardware fool-proofing is realized, and the risk of short circuit of electronic equipment is reduced.

In one embodiment, the first power control module 1 comprises a first control unit 11 and a first switching unit 12; a first control end and a second control end of the first control unit 11 are respectively connected to a first power enable signal and a second power enable signal, an output end of the first control unit 11 is connected to a control end of the first switch unit 12, and a power input end and a power output end of the first switch unit 12 are respectively connected to the first power supply and the target power supply end.

In the present embodiment, the first control unit 11 generates a control signal for controlling the first switching unit 12 under the common control of the first power supply enable signal and the second power supply enable signal, and the first switching unit 12 achieves connection or disconnection of the first power supply and the target power supply terminal under the control of the control signal. The first switch unit 12 may be implemented by using a MOS element, or may also be implemented by using a power chip or a power switch, which can achieve the purpose of power switching, and the specific implementation manner of the first switch unit 12 is not limited in this embodiment.

In an embodiment, an element of an electronic device, in which power supplies are classified into different levels, is an SD card, a 3.3V power VCC-3V3 is a first power, a 1.8V power VCC-1V8 is a second power, a power supply terminal VDD-SD of the SD card is a target power, sdcad-3V 3-EN is a first power enable signal, and sdcad-1V 8-EN is a second power enable signal, as an example, fig. 2 is a circuit connection diagram of an embodiment of a first power control module 1 according to an embodiment of the present invention. The first control unit 11 comprises a first switch, a second switch, a first resistor R3 and a second resistor R4; the first switch includes a first NPN transistor Q3, the second switch includes a second NPN transistor Q4, a base of the first NPN transistor Q3 is connected to the first power enable signal through the first resistor R3, a collector of the first NPN transistor Q3 is connected to the control terminal of the first switching unit 12, an emitter of the first NPN transistor Q3 is grounded, a base of the second NPN transistor Q4 is connected to the second power enable signal through the second resistor R4, a collector of the second NPN transistor Q4 is connected to the base of the first NPN transistor Q3, and an emitter of the second NPN transistor Q4 is grounded.

In this embodiment, the first switch may be, but is not limited to, a first NPN transistor Q3, and the second switch may be, but is not limited to, a second NPN transistor Q4. When the first power enable signal is an active high signal and the second power enable signal is an inactive low signal, the first NPN transistor Q3 is turned on, the second NPN transistor Q4 is turned off, the control terminal of the first switching unit 12 is connected to ground through the first NPN transistor Q3, and the first switching unit 12 is controlled to be turned on, such that the first power is connected to the target power terminal. When the second power enable signal is an active high signal, the second NPN transistor Q4 is turned on, and the base of the first NPN transistor Q3 is pulled low, so that the first NPN transistor Q3 is turned off, and therefore, no matter whether the first power enable signal is an active high signal or an inactive low signal, the control terminal of the first switching unit 12 is disconnected from ground, and thus the first switching unit 12 is disconnected, so that the first power source is disconnected from the target power source terminal. When the first power enable signal and the second power enable signal are both low-level disable signals, the first NPN transistor Q3 and the second NPN transistor Q4 are both turned off, and the control terminal of the first switching unit 12 is also disconnected from ground, so that the first switching unit 12 is disconnected, and the first power supply is disconnected from the target power supply terminal. Therefore, the connection and disconnection of the first power supply and the target power supply end are controlled by the first power supply enabling signal and the second power supply enabling signal together, the connection of the first power supply and the target power supply end is closed only when the first power supply enabling signal is effective and the second power supply enabling signal is ineffective, and the connection of the first power supply and the target power supply end is disconnected under other conditions. The first resistor R3 and the second resistor R4 are current limiting resistors.

In one embodiment, referring to fig. 2, the first switch unit 12 includes a third switch, a fourth switch and a third resistor R1; the third switch includes a first P-channel MOS transistor Q1, the fourth switch includes a second P-channel MOS transistor Q2, a drain of the first P-channel MOS transistor Q1 is connected to the first power supply, a source of the first P-channel MOS transistor Q1 is connected to a source of the second P-channel MOS transistor Q2 and one end of the third resistor R1, a drain of the second P-channel MOS transistor Q2 is connected to the target power supply terminal, and a gate of the first P-channel MOS transistor Q1, a gate of the second P-channel MOS transistor Q2, and the other end of the third resistor R1 are connected to a collector of the first NPN type triode Q3.

In this embodiment, the third switch may, but is not limited to, employ a first P-channel MOS transistor Q1, and the fourth switch may, but is not limited to, employ a second P-channel MOS transistor Q2. When the first NPN transistor Q3 is turned on, the gates of the first P-channel MOS transistor Q1 and the second P-channel MOS transistor Q2 are both turned on by the turned-on first NPN transistor Q3 being grounded, so that the first power supply is conductively connected to the target power supply terminal. When the first NPN transistor Q3 is turned off, the gates of the first P-channel MOS transistor Q1 and the second P-channel MOS transistor Q2 are both disconnected from ground and turned off, so that the first power supply is disconnected from the target power supply terminal. Therefore, the first control unit 11 controls the first switch unit 12 to be switched on and off, and the first power supply and the target power supply end are switched on and off. The third resistor R1 is used for ensuring that the first P-channel MOS transistor Q1 and the second P-channel MOS transistor Q2 work reliably.

Optionally, the first switch unit 12 further includes a first capacitor C1, and the first capacitor C1 is connected between the first power supply and ground to filter the first power supply.

Optionally, the first switch unit 12 further comprises a second capacitor C2, and the second capacitor C2 is connected between the target power supply terminal and ground to filter the target power supply. Further optionally, the first switch unit 12 further includes a seventh resistor R2, and the seventh resistor R2 is connected between the target power source terminal and ground and is a bleeder resistor.

In one embodiment, the second power control module 2 comprises a second control unit 21 and a second switching unit 22; the first control end and the second control end of the second control unit 21 are respectively connected to a second power enable signal and a first power enable signal, the output end of the second control unit 21 is connected to the control end of the second switch unit 22, and the power input end and the power output end of the second switch unit 22 are respectively connected to the second power supply and the target power supply end.

In the present embodiment, the second control unit 21 generates a control signal for controlling the second switching unit 22 under the common control of the first power supply enable signal and the second power supply enable signal, and the second switching unit 22 achieves connection or disconnection of the second power supply and the target power supply terminal under the control of the control signal. The second switch unit 22 may be implemented by using a MOS device, or may also be implemented by using a power chip or a power switch, which can achieve the purpose of power switching, and the specific implementation manner of the second switch unit 22 is not limited in this embodiment.

In an embodiment, the SD card is taken as an element whose power supplies in the electronic device are classified into different classes, the 3.3V VCC-3V3 is taken as the first power supply, the 1.8V VCC-1V8 is taken as the second power supply, the power supply terminal VDD-SD of the SD card is taken as the target power supply terminal, the sdcad-3V 3-EN is taken as the first power supply enable signal, and the sdcad-1V 8-EN is taken as the second power supply enable signal, as an example, fig. 3 is a circuit connection diagram of an embodiment of the second power control module 2 according to an embodiment of the present invention. The second control unit 21 includes a fifth switch, a sixth switch, a fourth resistor R7, and a fifth resistor R8; the fifth switch includes a third NPN transistor Q7, the sixth switch includes a fourth NPN transistor Q8, a base of the third NPN transistor Q7 is connected to the second power enable signal through the fourth resistor R7, a collector of the third NPN transistor Q7 is connected to the control terminal of the second switching unit 22, an emitter of the third NPN transistor Q7 is grounded, a base of the fourth NPN transistor Q8 is connected to the first power enable signal through the fifth resistor R8, a collector of the fourth NPN transistor Q8 is connected to the base of the third NPN transistor Q7, and an emitter of the fourth NPN transistor Q8 is grounded.

In this embodiment, the fifth switch may be, but is not limited to, a third NPN transistor Q7, and the sixth switch may be, but is not limited to, a fourth NPN transistor Q8. When the first power enable signal is a low-level disable signal and the second power enable signal is a high-level enable signal, the third NPN transistor Q7 is turned on, the fourth NPN transistor Q8 is turned off, the control terminal of the second switching unit 22 is connected to ground through the third NPN transistor Q7, and the second switching unit 22 is controlled to be turned on, such that the second power source is connected to the target power source terminal. When the first power enable signal is an active high signal, the fourth NPN transistor Q8 is turned on, and the base of the third NPN transistor Q7 is pulled low, so that the third NPN transistor Q7 is turned off, and therefore, no matter whether the second power enable signal is an active high signal or an inactive low signal, the control terminal of the second switching unit 22 is disconnected from ground, and thus the second switching unit 22 is disconnected, so that the second power source is disconnected from the target power source terminal. When the first power enable signal and the second power enable signal are both low-level disable signals, the third NPN transistor Q7 and the fourth NPN transistor Q8 are both turned off, and the control terminal of the second switching unit 22 is also disconnected from ground, so that the second switching unit 22 is disconnected, and the second power is disconnected from the target power terminal. Therefore, the connection and disconnection of the second power supply and the target power supply end are controlled by the first power supply enabling signal and the second power supply enabling signal together, the connection of the second power supply and the target power supply end is closed only when the second power supply enabling signal is effective and the first power supply enabling signal is ineffective, and the connection of the second power supply and the target power supply end is disconnected under other conditions. The fourth resistor R7 and the fifth resistor R8 are current limiting resistors.

In one embodiment, referring to fig. 3, the second switch unit 22 includes a seventh switch, an eighth switch and a sixth resistor R5; the seventh switch includes a third P-channel MOS transistor Q5, the eighth switch includes a fourth P-channel MOS transistor Q6, a drain of the third P-channel MOS transistor Q5 is connected to the second power supply, a source of the third P-channel MOS transistor Q5 is connected to the source of the fourth P-channel MOS transistor Q6 and one end of the sixth resistor R5, a drain of the fourth P-channel MOS transistor Q6 is connected to the target power supply terminal, and a gate of the third P-channel MOS transistor Q5, a gate of the fourth P-channel MOS transistor Q6, and the other end of the sixth resistor R5 are connected to a collector of the third NPN transistor Q7.

In this embodiment, the seventh switch may be, but is not limited to, a third P-channel MOS transistor Q5, and the eighth switch may be, but is not limited to, a fourth P-channel MOS transistor Q6. When the third NPN transistor Q7 is turned on, gates of the third P-channel MOS transistor Q5 and the fourth P-channel MOS transistor Q6 are both turned on by grounding the turned-on third NPN transistor Q7, so that the second power source is conductively connected to the target power source terminal. When the third NPN transistor Q7 is turned off, the gates of the third P-channel MOS transistor Q5 and the fourth P-channel MOS transistor Q6 are both disconnected from ground and turned off, so that the second power supply is disconnected from the target power supply terminal. Thereby, the second control unit 21 controls the second switch unit 22 to be turned on and off, and further, the second power supply and the target power supply terminal are turned on and off. The sixth resistor R5 is used to ensure reliable operation of the third P-channel MOS transistor Q5 and the fourth P-channel MOS transistor Q6.

Optionally, the second switch unit 22 further includes a third capacitor C3, and the third capacitor C3 is connected between the second power supply and ground to filter the second power supply.

Optionally, the second switch unit 22 further comprises a fourth capacitor C4, and the fourth capacitor C4 is connected between the target power supply terminal and ground to filter the target power supply. Further optionally, the second switch unit 22 further includes an eighth resistor R6, and the eighth resistor R6 is connected between the target power source terminal and ground and is a bleeder resistor.

The voltage adaptive power supply circuit in the embodiment comprises a first power supply control module 1 and a second power supply control module 2; a first control end and a second control end of the first power control module 1 are respectively connected with a first power enable signal and a second power enable signal, and a power input end and a power output end of the first power control module 1 are respectively connected with a first power supply and a target power supply end; a first control end and a second control end of the second power control module 2 are respectively connected with a second power enable signal and a first power enable signal, and a power input end and a power output end of the second power control module 2 are respectively connected with a second power supply and the target power supply end; the first power control module 1 and the second power control module 2 are configured to implement connection or disconnection between the target power source end and the first power source and the second power source under common control of the first power enable signal and the second power enable signal. Therefore, the connection and disconnection of the first power supply and the second power supply with the target power supply end are controlled by the first power supply enabling signal and the second power supply enabling signal together, and the power supply corresponding to the effective enabling signal is closed and the power supply corresponding to the ineffective enabling signal is disconnected only when one of the power supply enabling signals is effective; and simultaneously disconnecting the two power supplies when the two power supply enabling signals are both effective or both ineffective. The technical problem that two power supplies cannot be simultaneously turned off by controlling the two power supplies through one signal at present is solved, hardware fool-proofing is realized, and the risk of short circuit of electronic equipment is reduced.

Example two

The present embodiment provides an SD card power supply, which includes the voltage adaptive power supply circuit of the first embodiment. The SD card power supply of this embodiment can make the connection and disconnection between the target power supply end and the first power supply and the second power supply be controlled by the first power supply enable signal and the second power supply enable signal, so that only when one of the power supply enable signals is valid, the power supply corresponding to the valid enable signal is turned on, and the power supply corresponding to the invalid enable signal is turned off; and simultaneously disconnecting the two power supplies when the two power supply enabling signals are both effective or both ineffective. The technical problem that two power supplies cannot be simultaneously turned off by controlling the two power supplies through one signal at present is solved, hardware fool-proofing is realized, and the risk of short circuit of electronic equipment is reduced. The specific structure of the voltage adaptive power supply circuit is as described in the above embodiment, and is not described herein again.

EXAMPLE III

The present embodiment provides an electronic device including the voltage adaptive power supply circuit according to the first embodiment. The electronic device of this embodiment can enable connection and disconnection between the first power supply and the target power supply end and between the second power supply and the target power supply end to be commonly controlled by the first power supply enabling signal and the second power supply enabling signal, so that only when one of the power supply enabling signals is valid, the power supply corresponding to the valid enabling signal is turned on, and the power supply corresponding to the invalid enabling signal is turned off; and simultaneously disconnecting the two power supplies when the two power supply enabling signals are both effective or both ineffective. The technical problem that two power supplies cannot be simultaneously turned off by controlling the two power supplies through one signal at present is solved, hardware fool-proofing is realized, and the risk of short circuit of electronic equipment is reduced. The specific structure of the voltage adaptive power supply circuit is as described in the above embodiment, and is not described herein again.

The corresponding technical features in the above embodiments may be used with each other without causing contradiction in the schemes or without being implementable.

It should be noted that, in this document, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (9)

1. A voltage adaptive power supply circuit is characterized by comprising a first power supply control module and a second power supply control module;

the first control end and the second control end of the first power control module are respectively connected with a first power enable signal and a second power enable signal, and the power input end and the power output end of the first power control module are respectively connected with a first power supply and a target power supply end;

a first control end and a second control end of the second power control module are respectively connected with a second power enable signal and a first power enable signal, and a power input end and a power output end of the second power control module are respectively connected with a second power supply and the target power supply end;

the first power supply control module and the second power supply control module are used for realizing connection or disconnection of the target power supply end with the first power supply and the second power supply under the common control of the first power supply enabling signal and the second power supply enabling signal.

2. The voltage adaptive power supply circuit according to claim 1, wherein the first power supply control module includes a first control unit and a first switching unit;

the first control end and the second control end of the first control unit are respectively connected with a first power supply enabling signal and a second power supply enabling signal, the output end of the first control unit is connected with the control end of the first switch unit, and the power supply input end and the power supply output end of the first switch unit are respectively connected with the first power supply and the target power supply end.

3. The voltage adaptive power supply circuit according to claim 2, wherein the first control unit includes a first switch, a second switch, a first resistor, and a second resistor;

the first switch comprises a first NPN type triode, the second switch comprises a second NPN type triode, the base electrode of the first NPN type triode is connected with the first power supply enabling signal through the first resistor, the collector electrode of the first NPN type triode is connected with the control end of the first switch unit, the emitting electrode of the first NPN type triode is grounded, the base electrode of the second NPN type triode is connected with the second power supply enabling signal through the second resistor, the collector electrode of the second NPN type triode is connected with the base electrode of the first NPN type triode, and the emitting electrode of the second NPN type triode is grounded.

4. The voltage adaptive power supply circuit according to claim 3, wherein the first switching unit includes a third switch, a fourth switch, and a third resistor;

the third switch comprises a first P-channel MOS tube, the fourth switch comprises a second P-channel MOS tube, the drain electrode of the first P-channel MOS tube is connected with the first power supply, the source electrode of the first P-channel MOS tube is respectively connected with the source electrode of the second P-channel MOS tube and one end of the third resistor, the drain electrode of the second P-channel MOS tube is connected with the target power supply end, and the grid electrode of the first P-channel MOS tube, the grid electrode of the second P-channel MOS tube and the other end of the third resistor are connected with the collector electrode of the first NPN type triode.

5. The voltage adaptive power supply circuit according to any one of claims 1-4, wherein the second power supply control module comprises a second control unit and a second switching unit;

the first control end and the second control end of the second control unit are respectively connected with a second power supply enabling signal and a first power supply enabling signal, the output end of the second control unit is connected with the control end of the second switch unit, and the power supply input end and the power supply output end of the second switch unit are respectively connected with the second power supply and the target power supply end.

6. The voltage adaptive power supply circuit according to claim 5, wherein the second control unit includes a fifth switch, a sixth switch, a fourth resistor, and a fifth resistor;

the fifth switch comprises a third NPN type triode, the sixth switch comprises a fourth NPN type triode, a base of the third NPN type triode is connected with the second power enable signal through a fourth resistor, a collector of the third NPN type triode is connected with the control end of the second switch unit, an emitter of the third NPN type triode is grounded, a base of the fourth NPN type triode is connected with the first power enable signal through the fifth resistor, a collector of the fourth NPN type triode is connected with the base of the third NPN type triode, and an emitter of the fourth NPN type triode is grounded.

7. The voltage adaptive power supply circuit according to claim 6, wherein the second switching unit includes a seventh switch, an eighth switch, and a sixth resistor;

the seventh switch comprises a third P-channel MOS transistor, the eighth switch comprises a fourth P-channel MOS transistor, a drain of the third P-channel MOS transistor is connected with the second power supply, a source of the third P-channel MOS transistor is respectively connected with a source of the fourth P-channel MOS transistor and one end of the sixth resistor, a drain of the fourth P-channel MOS transistor is connected with the target power supply end, and a gate of the third P-channel MOS transistor, a gate of the fourth P-channel MOS transistor, and the other end of the sixth resistor are connected with a collector of the third NPN-type triode.

8. An SD card power supply characterized in that it comprises the voltage adaptive power supply circuit according to any one of claims 1 to 7.

9. An electronic device characterized in that it comprises a voltage adaptive power supply circuit according to any one of claims 1-7.

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