CN216530706U - Power supply switching circuit - Google Patents
Power supply switching circuit Download PDFInfo
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- CN216530706U CN216530706U CN202123062816.1U CN202123062816U CN216530706U CN 216530706 U CN216530706 U CN 216530706U CN 202123062816 U CN202123062816 U CN 202123062816U CN 216530706 U CN216530706 U CN 216530706U
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Abstract
The disclosure relates to the technical field of power supply, and discloses a power supply switching circuit. The power supply switching circuit comprises a power supply output end and a first voltage stabilizing unit, wherein the input end of the first voltage stabilizing unit is connected with the output end of a main power supply; the first end of the first switch unit is connected with the output end of the first voltage stabilizing unit, and the second end of the first switch unit is connected with the power supply output end; the input end of the second voltage stabilizing unit is connected with the output end of the standby power supply; the first end of the second switch unit is connected with the output end of the second voltage stabilizing unit, and the second end of the second switch unit is connected with the power supply output end; the enabling end of the first driving circuit is grounded, and the output end of the first driving circuit is connected with the control end of the first switch unit; and the enabling end of the second driving circuit is connected with the voltage division output end of the voltage division circuit, the output end of the second driving circuit is connected with the control end of the second switch unit, and the input end of the voltage division circuit is connected with the output end of the first voltage stabilization unit.
Description
Technical Field
The disclosure relates to the technical field of power supplies, in particular to a power supply switching circuit.
Background
In the related art, as shown in fig. 1, in the main/standby power switching circuit, main power is generally supplied by a commercial power AC220V, and standby power is generally supplied by a storage battery. Normally, the main AC220V provides the power for the next required power, and the battery is in standby mode, and when the main AC220V loses power, the battery is turned to the standby battery to provide the power for the next required power. Because the power supply is switched by the two diodes D1 and D2, the voltage drop of the diodes is 0.7V-1V when the diodes work normally, and the loss of the diodes is very large when the current is large.
Disclosure of Invention
The present disclosure is directed to overcome the above-mentioned deficiencies in the prior art and to provide a power switching circuit.
The present disclosure provides a power switching circuit, including the power supply output end, the power switching circuit still includes: the input end of the first voltage stabilizing unit is connected with the output end of the main power supply; a first end of the first switch unit is connected with the output end of the first voltage stabilizing unit, and a second end of the first switch unit is connected with the power supply output end; the input end of the second voltage stabilizing unit is connected with the output end of the standby power supply; a first end of the second switch unit is connected with the output end of the second voltage stabilizing unit, and a second end of the second switch unit is connected with the power supply output end; the enable end of the first driving circuit is grounded, and the output end of the first driving circuit is connected with the control end of the first switch unit; and the enabling end of the second driving circuit is connected with the voltage division output end of the voltage division circuit, the output end of the second driving circuit is connected with the control end of the second switch unit, and the input end of the voltage division circuit is connected with the output end of the first voltage stabilization unit.
In an exemplary embodiment of the present disclosure, the first driving circuit further includes: the first control end is connected with the first end of the first switch unit; the second control end is connected with the second end of the first switch unit; the first driving circuit is configured to output a turn-on level signal when a voltage of the first control terminal is greater than a voltage of the second control terminal.
In an exemplary embodiment of the present disclosure, the second driving circuit further includes: a third control terminal connected to the first terminal of the second switching unit; the fourth control end is connected with the second end of the second switch unit; the second driving circuit is configured to output a turn-on level signal when the voltage of the third control terminal is greater than the voltage of the fourth control terminal.
In an exemplary embodiment of the present disclosure, further comprising: and the anode of the first diode is connected with the first end of the first switch unit, and the cathode of the first diode is connected with the second end of the first switch unit.
In an exemplary embodiment of the present disclosure, further comprising: and the anode of the third diode is connected with the first end of the second switch unit, and the cathode of the third diode is connected with the second end of the second switch unit.
In an exemplary embodiment of the present disclosure, the voltage dividing circuit includes a third resistor and a fourth resistor; and the first end of the third resistor is used as the input end of the voltage division circuit, the second end of the third resistor is connected with the first end of the fourth resistor and then is used as the voltage division output end of the voltage division circuit, and the second end of the fourth resistor is grounded.
In an exemplary embodiment of the present disclosure, further comprising: the anode of the second diode is connected with the output end of the first voltage stabilizing unit, and the cathode of the second diode is connected with the enabling end of the first driving circuit; and the anode of the fourth diode is connected with the output end of the second voltage stabilizing unit, and the cathode of the fourth diode is connected with the enabling end of the second driving circuit.
In an exemplary embodiment of the present disclosure, the first driving circuit further includes a soft start terminal, and the power switching circuit further includes: one end of the first resistor is connected with the second end of the first switch unit, and the other end of the first resistor is connected with the soft starting end of the first driving circuit; and one end of the first capacitor is connected with the soft starting end of the first driving circuit, and the other end of the first capacitor is grounded.
In an exemplary embodiment of the present disclosure, the second driving circuit further includes a soft start terminal, and the power switching circuit further includes: one end of the second resistor is connected with the second end of the second switch unit, and the other end of the second resistor is connected with the soft starting end of the second driving circuit; and one end of the second capacitor is connected with the soft starting end of the second driving circuit, and the other end of the second capacitor is grounded.
In an exemplary embodiment of the present disclosure, the first voltage stabilizing unit is an AC-DC unit, the second voltage stabilizing unit is a DC-DC unit, and an output voltage of the DC-DC unit is less than or equal to an output voltage of the AC-DC unit; the first switch unit and the second switch unit are both N-type MOS tubes.
The utility model provides a power supply switching circuit sets up first voltage stabilizing unit through the output at main power supply, sets up second voltage stabilizing unit at stand-by power supply's output, and like this, when stand-by power supply supplies power, accessible second voltage stabilizing unit output stable supply voltage supplies power for the load. And the voltage drop of the first switch unit and the second switch unit in the conducting state is lower, so that the power supply switching circuit can have smaller voltage drop loss when the main power supply supplies power.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 is a schematic circuit diagram of a power switching circuit in the related art;
fig. 2 is a schematic structural diagram of a power switching circuit according to an embodiment of the disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
The disclosed embodiment provides a power switching circuit, and fig. 2 is a schematic structural diagram of a power switching circuit according to an embodiment of the present disclosure, and as shown in fig. 2, the power switching circuit may include a power supply output terminal Vout0, where the power supply output terminal Vout0 is used for connecting a load to output a power supply voltage output by a main power supply or a backup power supply 20 to the load for power supply. The power switching circuit may further include: the power supply comprises a first voltage stabilizing unit 11, a second voltage stabilizing unit 12, a first switching unit Q1, a second switching unit Q2, a first driving circuit 21 and a second driving circuit 22, wherein the input end of the first voltage stabilizing unit 11 is connected with the output end of a main power supply 10; a first end of the first switching unit Q1 is connected to the output end of the first voltage stabilizing unit 11, and a second end of the first switching unit Q1 is connected to the power supply output end Vout 0; the input end of the second voltage stabilizing unit 12 is connected with the output end of the standby power supply 20; a first end of the second switching unit Q2 is connected to the output end of the second voltage stabilizing unit 12, and a second end of the second switching unit Q2 is connected to the power supply output end Vout 0; the enable terminal of the first driving circuit 21 is grounded, and the output terminal of the first driving circuit 21 is connected with the control terminal of the first switching unit Q1; an enable terminal of the second driving circuit 22 is connected to the voltage dividing output Vo of the voltage dividing circuit 30, an output terminal of the second driving circuit 22 is connected to a control terminal of the second switching unit Q2, and an input terminal of the voltage dividing circuit 30 is connected to an output terminal of the first voltage stabilizing unit 11.
The power supply switching circuit provided by the present disclosure sets the first voltage stabilizing unit 11 at the output end of the main power supply 10, and sets the second voltage stabilizing unit 12 at the output end of the standby power supply 20, so that when the standby power supply 20 supplies power, the second voltage stabilizing unit 12 can output stable power supply voltage to supply power to the load. Also, the voltage drop of the first and second switching units Q1 and Q2 in the on state is low, and thus the power switching circuit may have a small voltage drop loss when the main power supply 10 supplies power.
The operation principle of the disclosed power switching circuit and the functions of each component will be specifically described below with reference to the accompanying drawings.
As shown in fig. 2, in the present exemplary embodiment, the first regulated power supply may be an AC-DC unit, which is used to convert the incoming 220V commercial power into a stable DC voltage for outputting, so as to supply power to the load at the subsequent stage. The second voltage stabilizing unit 12 may be a DC-DC unit for converting the output voltage of the backup power supply 20 into a stable DC voltage to supply the load. The backup power supply 20 is usually a storage battery, and the output voltage of the backup power supply 20 decreases with the decrease of the power thereof, and the output voltage of the backup power supply 20 is not decreased due to the decrease of the power of the backup power supply 20 when the backup power supply 20 supplies power to the load in the present exemplary embodiment, so that the power switching circuit provided in the present exemplary embodiment can still provide a stable power supply voltage for the subsequent stage continuously during the operation of the backup power supply 20. It should be appreciated that in other exemplary embodiments, the first and second regulated power supplies may have other configurations.
As shown in fig. 2, in the present exemplary embodiment, the first switching unit Q1 and the second switching unit Q2 may be MOS transistors, because the voltage drop of the MOS transistors when conducting is very small, and thus, when the power switching circuit is operating normally, the circuit loss caused by the voltage drop is very small and can be almost ignored. In the present exemplary embodiment, each of the first and second switching units Q1 and Q2 may be an N-type MOS transistor. Illustratively, the first switching unit Q1 is turned on when the first driving circuit 21 outputs a high level, and the first switching unit Q1 is turned off when the first driving circuit 21 outputs a low level. It should be understood that, in other exemplary embodiments of the present disclosure, the first switching unit Q1 and the second switching unit Q2 may have other circuit structures, for example, the first switching unit Q1 is PMOS, the control terminal of the first switching unit Q1 is connected to the output terminal of the first driving circuit 21 after being connected to the inverter, and the like, and these structures all fall within the protection scope of the present disclosure.
As shown in fig. 2, in the present exemplary embodiment, the first driving circuit 21 is used to drive the first switching unit Q1, and the second driving circuit 22 is used to drive the second switching unit Q2. The first driving circuit 21 and the second driving circuit 22 may have the same structure and operation principle, and only the first driving circuit 21 will be described as an example. The first driving circuit 21 may include an enable terminal for controlling the first driving circuit 21 to be turned on or off, a first control terminal, a second control terminal, and an output terminal, and a voltage difference between the first control terminal and the second control terminal is used for controlling the output terminal of the first driving circuit 21 to be turned on or off. When the enable terminal is at the enable effective level, the first driving circuit 21 is in an open state, and the first driving circuit 21 controls the output terminal to be opened or closed according to the voltage difference between the first control terminal and the second control terminal. Illustratively, the enable active level of the first driving circuit 21 is a low level, and when the voltage of the first control terminal is higher than the voltage of the second control terminal, the output terminal of the first driving circuit 21 is turned on, and conversely, if the voltage of the first control terminal is lower than the voltage of the second control terminal, the output terminal of the first driving circuit 21 is turned off.
In the present exemplary embodiment, the output voltage at the output terminal of the first driving circuit 21 is used to control the first switching unit Q1 connected thereto to be turned on or off. The first switching unit Q1 may be controlled to be turned on when the output terminal of the first driving circuit 21 outputs a turn-on level, and the first switching unit Q1 may be controlled to be turned off when the output terminal of the first driving circuit 21 outputs a turn-off level. In the present exemplary embodiment, the conduction levels of the first driving circuit 21 and the second driving circuit 22 are determined according to the connected switching units, for example, when the output terminal of the first driving circuit 21 is connected to an NMOS transistor, the conduction level of the output terminal of the first driving circuit 21 may be a high level.
Further, in the present exemplary embodiment, both the first drive circuit 21 and the second drive circuit 22 may be integrated chips, and the same chip may be used for the first drive circuit 21 and the second drive circuit 22. Taking the first driving circuit 21 as an example, the integrated chip may include an OFF pin, an IN pin, an OUT pin, a GATE pin, a VS pin, and a ground pin, where the OFF pin is an enable pin, and when the level of the OFF pin is low, the chip is IN an enable state; when the OFF pin level is high (>5V), the chip is in standby mode, and the level between the GATE pin voltage (Vg) and the OUT pin voltage (Vout) of the chip is low. When the chip is IN an enable state, if the voltage (Vin) of the IN pin of the chip is greater than the voltage (Vout) of the OUT pin, the level between the GATE pin and the voltage of the OUT pin of the chip is a high level (>5V), the chip drives the switch unit connected to the GATE pin to be turned on, and when Vin is less than or equal to Vout, the level between the GATE pin and the OUT pin of the chip is a low level (0V), and the chip drives the switch unit connected to the GATE pin to be turned off.
As shown in fig. 2, in the present exemplary embodiment, in order to realize the switching between the main power supply 10 and the backup power supply 20, a voltage dividing circuit 30 is further connected to the enable terminal of the second driving circuit 22, and the input terminal Vi of the voltage dividing circuit 30 is connected to the output terminal of the main power supply 10, so that the main power supply 10 can control the second driving circuit 22 to be turned on or off through the voltage dividing circuit 30. When the main power supply 10 supplies power, the voltage dividing output Vo of the voltage dividing circuit 30 outputs a high level to turn off the second driving circuit 22, so that the main power supply 10 outputs power through the first switching unit Q1; when the main power supply 10 is powered down, the voltage dividing output Vo of the voltage dividing circuit 30 outputs a low level to turn on the second driving circuit 22, and the second driving circuit 22 drives the second switching unit Q2 to be turned on, so that the standby power supply 20 performs power supply output through the second switching unit Q2. It can be seen that the power supply switching circuit provided in the present exemplary embodiment can automatically control the switch driving circuit of the backup power supply 20 to be turned off when the main power supply 10 is in operation, and automatically turn on the switch driving circuit of the backup power supply 20 when the main power supply 10 is out of power, thereby achieving automatic switching of the main power supply 10 and the backup power supply 20.
As shown in fig. 2, in the present exemplary embodiment, the voltage dividing circuit 30 may be a resistance voltage dividing circuit 30, and the resistance voltage dividing circuit 30 includes a third resistor R3 and a fourth resistor R4, wherein a first end of the third resistor R3 is used as the input Vi of the voltage dividing circuit 30, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4 and then used as the voltage dividing output Vo of the voltage dividing circuit 30, and a second end of the fourth resistor R4 is grounded. The resistances of the third resistor R3 and the fourth resistor R4 are adjustable according to the allowable voltage of the enable terminal of the second driving circuit 22, so that the output voltage of the voltage dividing circuit 30 is within the allowable voltage range of the enable terminal. It should be understood that the voltage dividing circuit 30 may have other circuit configurations in other exemplary embodiments of the present disclosure.
The following provides a detailed description of the various switching states of the main power supply 10 and the backup power supply 20 of the present disclosure.
When the main power supply 10 supplies power, the main power supply 10 outputs a high level signal to the enable terminal of the second driving circuit 22 through the AC-DC unit, and controls the second driving circuit 22 to be turned off, so that the second switching unit Q2 is turned off. Since the enable terminal of the first control circuit is grounded to be at a low level, the second driving circuit 22 is in an on state, and since the second control terminal of the first driving circuit 21 is connected to the load, the voltage of the first control terminal is higher than that of the second control terminal, so that the first driving circuit 21 outputs a high level signal to control the first switching unit Q1 to be turned on, and the main power supply 10 outputs a power supply signal through the first switching unit Q1. When the main power supply 10 is powered down, the main power supply 10 outputs a low level signal to the enable terminal of the second driving circuit 22 through the AC-DC unit, the second driving circuit 22 is turned on, and also because the second control terminal of the second driving circuit 22 is connected to the load, the voltage of the first control terminal of the second driving circuit 22 is higher than that of the second control terminal, the second driving circuit 22 outputs a high level signal to drive the second switching unit Q2 to be turned on, so that the standby power supply 20 outputs a power supply signal through the second switching unit Q2. When the main power supply 10 is powered again, the main power supply 10 outputs a high level signal through the AC-DC unit to turn off the second driving circuit 22, so that the second switching unit Q2 is turned off, and the standby power supply 20 is switched to the main power supply 10 to supply power to the load at the subsequent stage. It can be seen that the power switching circuit provided by the present disclosure can realize automatic switching between the power supplied by the main power supply 10 and the power supplied by the standby power supply 20.
As shown in fig. 2, in the present exemplary embodiment, the power switching circuit further includes a first diode D1 and a third diode D3, wherein an anode of the first diode D1 is connected to the first terminal of the first switching unit Q1, and a cathode thereof is connected to the second terminal of the first switching unit Q1; the anode of the third diode D3 is connected to the first terminal of the second switching unit Q2, and the cathode is connected to the second terminal of the second switching unit Q2. By arranging the first diode D1 and the third diode D3, the follow current can be performed during the starting process of the first driving circuit 21 or the second driving circuit 22, the uninterrupted power supply is provided for the load, and the seamless switching between the main power supply 10 and the standby power supply 20 is realized. For example, taking the first diode D1 as an example, when the power supply is switched from the standby power supply 20 to the main power supply 10, because the first driving circuit 21 starts up with a certain delay, the main power supply 10 outputs the power supply voltage through the first diode D1, so as to realize uninterrupted power supply when the standby power supply 20 switches to the main power supply 10. Similarly, when the main power supply 10 loses power and is powered by the backup power supply 20, and the second driving circuit 22 is not fully started, the backup power supply 20 outputs a power supply signal through the third diode D3, so that uninterrupted power supply to the load is realized.
As shown in fig. 2, in the present exemplary embodiment, each of the first driving circuit 21 and the second driving circuit 22 may include a soft-start terminal, the soft-start terminal may be connected to a first resistor R1 and a first capacitor C1, one end of the first resistor R1 is connected to the second terminal of the first switching unit Q1, the other end of the first resistor R1 is connected to the soft-start terminal of the first driving circuit 21, one end of the first capacitor C1 is connected to the soft-start terminal of the first driving circuit 21, and the other end of the first capacitor C1 is grounded. The soft start end of the second driving circuit 22 is connected to one end of a second resistor R2 and one end of a second capacitor C2, respectively, the other end of the second resistor R2 is connected to the second end of the second switching unit Q2, and the other end of the second capacitor C2 is grounded. By arranging the first resistor R1 and the first capacitor C1 at the soft start end of the first driving circuit 21, the output end of the first driving circuit 21 can be controlled to be slowly turned on, so that the first switching unit Q1 is driven to be slowly turned on, the supply current smoothly rises, and the phenomenon that the first switch-on light is suddenly turned on to generate a large amount of current to damage the device can be avoided. Similarly, the second resistor R2 and the second capacitor C2 provided at the soft start end of the second driving circuit 22 can control the slow output of the second driving circuit 22, so as to drive the second switching unit Q2 to turn on slowly.
As shown in fig. 2, in the present exemplary embodiment, the power switching circuit may further include a second diode D2 and a fourth diode D4, wherein an anode of the second diode D2 is connected to the output terminal of the first voltage stabilizing unit 11, and a cathode thereof is connected to the enable terminal of the first driving circuit 21; the anode of the fourth diode D4 is connected to the output terminal of the second voltage stabilization unit 12, and the cathode is connected to the enable terminal of the second driving circuit 22. The second diode D2 and the fourth diode D4 may function as a clamp to protect the enable terminals of the first driver circuit 21 and the second driver circuit 22 from exceeding their bus voltages. For example, if there is an interference voltage signal such as static electricity in the first driving circuit 21, the interference voltage signal may be discharged through the second diode D2, so as to maintain the enable terminal of the first driving circuit 21 at a stable voltage. The fourth diode D4 has the same operation principle to protect the second driving circuit 22.
In addition, in the present exemplary embodiment, the output voltage of the DC-DC unit may be set to be the same as the output voltage of the AC-DC, or slightly less than the output voltage of the AC-DC, so that, when the main power supply 10 supplies power, the standby power supply 20 does not leak current to the rear stage via the third diode D3, that is, the standby power supply 20 does not have leakage current, because there is a voltage drop in the third diode D3.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. A power switching circuit comprising a power supply output, the power switching circuit further comprising:
the input end of the first voltage stabilizing unit is connected with the output end of the main power supply;
a first end of the first switch unit is connected with the output end of the first voltage stabilizing unit, and a second end of the first switch unit is connected with the power supply output end;
the input end of the second voltage stabilizing unit is connected with the output end of the standby power supply;
a first end of the second switch unit is connected with the output end of the second voltage stabilizing unit, and a second end of the second switch unit is connected with the power supply output end;
the enable end of the first driving circuit is grounded, and the output end of the first driving circuit is connected with the control end of the first switch unit;
and the enabling end of the second driving circuit is connected with the voltage division output end of the voltage division circuit, the output end of the second driving circuit is connected with the control end of the second switch unit, and the input end of the voltage division circuit is connected with the output end of the first voltage stabilization unit.
2. The power switching circuit of claim 1, wherein the first driver circuit further comprises:
the first control end is connected with the first end of the first switch unit;
the second control end is connected with the second end of the first switch unit;
the first driving circuit is configured to output a turn-on level signal when a voltage of the first control terminal is greater than a voltage of the second control terminal.
3. The power switching circuit of claim 1, wherein the second driving circuit further comprises:
a third control terminal connected to the first terminal of the second switching unit;
the fourth control end is connected with the second end of the second switch unit;
the second driving circuit is configured to output a turn-on level signal when the voltage of the third control terminal is greater than the voltage of the fourth control terminal.
4. The power switching circuit of claim 1, further comprising:
and the anode of the first diode is connected with the first end of the first switch unit, and the cathode of the first diode is connected with the second end of the first switch unit.
5. The power switching circuit of claim 1, further comprising:
and the anode of the third diode is connected with the first end of the second switch unit, and the cathode of the third diode is connected with the second end of the second switch unit.
6. The power switching circuit according to claim 1, wherein the voltage dividing circuit includes a third resistor and a fourth resistor;
the first end of the third resistor is used as the input end of the voltage division circuit, the second end of the third resistor is connected with the first end of the fourth resistor and then used as the voltage division output end of the voltage division circuit, and the second end of the fourth resistor is grounded.
7. The power switching circuit of claim 1, further comprising:
the anode of the second diode is connected with the output end of the first voltage stabilizing unit, and the cathode of the second diode is connected with the enabling end of the first driving circuit;
and the anode of the fourth diode is connected with the output end of the second voltage stabilizing unit, and the cathode of the fourth diode is connected with the enabling end of the second driving circuit.
8. The power switching circuit of claim 1, wherein the first driver circuit further comprises a soft start terminal, the power switching circuit further comprising:
one end of the first resistor is connected with the second end of the first switch unit, and the other end of the first resistor is connected with the soft starting end of the first driving circuit;
and one end of the first capacitor is connected with the soft starting end of the first driving circuit, and the other end of the first capacitor is grounded.
9. The power switching circuit of claim 1, wherein the second driving circuit further comprises a soft start terminal, the power switching circuit further comprising:
one end of the second resistor is connected with the second end of the second switch unit, and the other end of the second resistor is connected with the soft starting end of the second driving circuit;
and one end of the second capacitor is connected with the soft starting end of the second driving circuit, and the other end of the second capacitor is grounded.
10. The power switching circuit according to claim 1, wherein the first voltage stabilization unit is an AC-DC unit, the second voltage stabilization unit is a DC-DC unit, and an output voltage of the DC-DC unit is less than or equal to an output voltage of the AC-DC unit;
the first switch unit and the second switch unit are both N-type MOS tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123062816.1U CN216530706U (en) | 2021-12-08 | 2021-12-08 | Power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123062816.1U CN216530706U (en) | 2021-12-08 | 2021-12-08 | Power supply switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN216530706U true CN216530706U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123062816.1U Active CN216530706U (en) | 2021-12-08 | 2021-12-08 | Power supply switching circuit |
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| CN (1) | CN216530706U (en) |
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2021
- 2021-12-08 CN CN202123062816.1U patent/CN216530706U/en active Active
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