CN221993865U

CN221993865U - Power switching circuit and electronic equipment

Info

Publication number: CN221993865U
Application number: CN202420598665.6U
Authority: CN
Inventors: 朱事成; 邓冬明; 曾维
Original assignee: Phytium Technology Co Ltd
Current assignee: Phytium Technology Co Ltd
Priority date: 2024-03-26
Filing date: 2024-03-26
Publication date: 2024-11-12
Anticipated expiration: 2034-03-26

Abstract

The application provides a power supply switching circuit and electronic equipment, which are applied to the technical field of computers, wherein the power supply switching circuit comprises a switching circuit and a driving circuit, the switching circuit is connected with a first power supply, a second power supply, an electricity utilization load and the driving circuit, the driving circuit drives the switching circuit to be communicated with the first power supply and the electricity utilization load, or the driving switching circuit is communicated with the second power supply and the electricity utilization load.

Description

Power supply switching circuit and electronic equipment

Technical Field

The present application relates to the field of computer technologies, and in particular, to a power switching circuit and an electronic device.

Background

In the field of computers, many electrical loads have operation requirements for operating at different operating voltages, for example, some of the peripheral devices of the computer need to switch the operating voltages according to the operating mode during normal operation, and for example, the computer in the sleep mode is usually operated at a lower operating voltage than in the normal operation mode, so as to reduce the overall power consumption of the computer. It can be seen that switching different operating voltages according to operating requirements is of great importance in the field of computers.

In view of this, how to provide different working voltages for the electric load and meet the actual operation requirements of the electric load is one of the technical problems to be solved by those skilled in the art.

Disclosure of utility model

In view of the above, the present application is directed to providing a power switching circuit and an electronic device, which can establish electrical connection between different power sources and a power load in response to a control signal, so as to provide different working voltages for the power load, thereby meeting actual operation requirements of the power load.

In a first aspect, the present application provides a power supply switching circuit comprising:

The switching circuit is used for connecting a first power supply, a second power supply and an electric load, and the working voltages output by the first power supply and the second power supply are different;

The driving circuit is connected with the switch circuit;

the driving circuit is configured to: and driving the switching circuit to be communicated with the first power supply and the electric load, or driving the switching circuit to be communicated with the second power supply and the electric load.

Based on the above, the power supply switching circuit provided by the application comprises a switching circuit and a driving circuit, wherein the switching circuit is connected with a first power supply, a second power supply, an electric load and the driving circuit, the driving circuit drives the switching circuit to be communicated with the first power supply and the electric load, or drives the switching circuit to be communicated with the second power supply and the electric load.

Furthermore, compared with the implementation mode of providing different working voltages for an electric load by using an adjustable voltage chip in the prior art, the power supply switching circuit provided by the application realizes the output of different working voltages based on the cooperation of the driving circuit and the switching circuit, and the overall cost is lower.

In an alternative embodiment, the driving circuit includes: a first drive sub-circuit and a second drive sub-circuit, wherein,

The input ends of the first driving sub-circuit and the second driving sub-circuit are respectively connected with a third power supply;

the output ends of the first driving sub-circuit and the second driving sub-circuit are respectively connected with the switch circuit;

The first driving sub-circuit responds to a first control signal, and converts the output voltage of the third power supply into a first driving signal, wherein the first driving signal is used for driving the switching circuit to communicate the first power supply and the power load;

The second driving sub-circuit responds to a second control signal and converts the output voltage of the third power supply into a second driving signal, and the second driving signal is used for driving the switching circuit to be communicated with the second power supply and the power load.

In the application, an alternative implementation mode of the driving circuit is provided, the driving circuit comprises a first driving sub-circuit and a second driving sub-circuit, the first driving sub-circuit drives the switching circuit to be communicated with a first power supply and an electric load, the second driving sub-circuit drives the switching circuit to be communicated with a second power supply and the electric load, and the switching circuit is controlled by different driving sub-circuits in the process of communicating the power supply and the electric load, so that the mutual influence among the driving sub-circuits can be avoided, the anti-interference performance of the driving sub-circuits can be improved, the reliability of switching the power supply for the electric load can be improved, and the power supply safety of the electric load can be improved.

In an alternative embodiment, the first driving sub-circuit comprises: a first resistor and a second resistor, wherein

One end of the first resistor is used as an input end of the first driving sub-circuit, and the other end of the first resistor is connected with one end of the second resistor;

the other end of the second resistor is used for receiving the first control signal;

the connection point of the first resistor and the second resistor is used as the output end of the first driving sub-circuit.

In the application, the first driving sub-circuit is built based on discrete devices, namely the first resistor and the second resistor, the circuit structure is simple, the cost of the used components is low, the occupied circuit board area is small, the integral cost of the power supply switching circuit can be effectively reduced, the stability of the resistance element is high, the anti-interference capability is strong, and the running stability and the anti-electromagnetic interference performance of the first driving sub-circuit are improved.

In an alternative embodiment, the second driving sub-circuit comprises: a third resistor and a first diode, wherein,

One end of the third resistor is used as an input end of the second driving subcircuit, and the other end of the third resistor is connected with the anode of the first diode;

the cathode of the first diode is used for receiving the second control signal;

And the connection point of the third resistor and the first diode is used as the output end of the second driving subcircuit.

In the application, the second driving sub-circuit is built based on discrete devices, namely the third resistor and the first diode, the circuit structure is simple, the cost of the used components is low, the occupied circuit board area is small, the integral cost of the power supply switching circuit can be effectively reduced, in addition, the resistance element and the diode have high stability and strong anti-interference capability, and the running stability and the anti-electromagnetic interference performance of the second driving sub-circuit are improved.

In an alternative embodiment, the driving circuit further includes: a first controller, wherein,

The first controller is respectively connected with the first driving sub-circuit and the second driving sub-circuit;

The first controller is used for outputting the first control signal or the second control signal.

In the application, the driving circuit is also provided with the first controller, the first controller outputs a first control signal for driving the first driving sub-circuit or outputs a second control signal for driving the second driving sub-circuit, and the control signal is generated by the driving circuit, so that the interaction with an external controller or an upper computer can be avoided, the control process of the switching circuit is more direct, the signal transmission path is shortened, the possibility of being interfered by the outside can be effectively reduced, and the operation reliability of the power supply switching circuit is improved.

In one possible embodiment, the driving circuit comprises a second controller, wherein,

The second controller is used for outputting a third driving signal or a fourth driving signal;

The third driving signal is used for driving the switching circuit to be communicated with the first power supply and the electricity utilization load, and the fourth driving signal is used for driving the switching circuit to be communicated with the second power supply and the electricity utilization load.

In the present application, another alternative implementation of the driving circuit is provided, that is, only the second controller is included, and the second controller directly drives the switching circuit to communicate with the first power supply and the electric load, or to communicate with the second power supply and the electric load. The driving circuit provided by the application has the advantages of simple circuit structure and small occupied circuit board area, and can effectively reduce the overall cost of the power supply switching circuit.

In an alternative embodiment, the switching circuit comprises a first controllable switch and a second controllable switch, wherein,

The input end of the first controllable switch is used for being connected with the first power supply;

The input end of the second controllable switch is used for being connected with the second power supply;

The output ends of the first controllable switch and the second controllable switch are respectively connected with the power utilization load;

the first controllable switch is communicated with the first power supply and the power load when being conducted;

And when the second controllable switch is conducted, the second power supply and the electric load are communicated.

In the application, the switching circuit comprises the first controllable switch and the second controllable switch, the communication between the first power supply and the electric load is realized by the first controllable switch, the communication between the second power supply and the electric load is realized by the second controllable switch, the communication between the electric load and the power supply is controlled by different controllable switches, the communication processes are relatively independent, the mutual influence between the controllable switches can be avoided, the reliability of switching the power supply for the electric load can be improved, and the power supply safety of the electric load is improved.

In an alternative embodiment, the operating voltage of the first power supply is less than the operating voltage of the second power supply;

the first controllable switch comprises an N-type metal oxide semiconductor MOS tube, and the second controllable switch comprises a P-type MOS tube.

In the application, the N-type MOS tube is used for controlling the communication between the first power supply and the power utilization load, the P-type MOS tube is used for controlling the communication between the second power supply and the power utilization load, and meanwhile, the working voltage of the first power supply is smaller than that of the second power supply.

In one possible implementation, the first controllable switch includes a MOS transistor that does not include a body diode, and the second controllable switch includes a MOS transistor that does not include a body diode.

In the application, the first controllable switch and the second controllable switch are realized by adopting the MOS tube without the body diode, and the arrangement can effectively prevent current backflow between the power supplies no matter the first power supply or the second power supply is communicated with the power utilization load, thereby being beneficial to improving the operation safety of the power supply switching circuit.

In a second aspect, the present application provides an electronic device comprising: a first power supply, a second power supply, a third power supply, an electrical load, and a power switching circuit according to any one of the first aspects of the application, wherein,

The power supply switching circuit is respectively connected with the first power supply, the second power supply, the third power supply and the power utilization load.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a block diagram of a power switching circuit according to an embodiment of the present utility model.

Fig. 2 is a block diagram of another power switching circuit according to an embodiment of the present utility model.

Fig. 3 is a circuit topology diagram of a power switching circuit according to an embodiment of the present utility model.

Fig. 4 is a circuit topology diagram of another power switching circuit according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As mentioned above, in the field of computers, many electrical loads have operating requirements for operating at different operating voltages, for example, some of the peripheral devices of the computer need to switch operating voltages according to an operating mode during normal operation, and for example, the computer in the sleep mode is usually operated at a lower operating voltage than in the normal operating mode, so as to reduce the overall power consumption of the computer. It can be seen that switching different operating voltages according to operating requirements is of great importance in the field of computers.

Based on the above, in order to meet the actual operation requirement of the electric load, the application provides a power supply switching circuit, which comprises a switching circuit and a driving circuit, wherein the switching circuit is connected with a first power supply, a second power supply, the electric load and the driving circuit, and the driving circuit drives the switching circuit to be communicated with the first power supply and the electric load, or drives the switching circuit to be communicated with the second power supply and the electric load.

Based on the above, referring to fig. 1, the power supply switching circuit provided by the present application includes a driving circuit 10 and a switching circuit 20.

Specifically, the first power supply terminal of the switching circuit 20 is connected to the first power supply 30, the second power supply terminal is connected to the second power supply 40, and the load terminal is connected to the power load 50. An output terminal of the driving circuit 10 is connected to a driving terminal of the switching circuit 20.

To meet the actual operating requirement of the electrical load, the operating voltage output by the first power supply 30 is different from the operating voltage output by the second power supply 40. For example, in the computer field, the 1.8V and 3.3V dc voltages are the operating voltages of the common electrical loads, in which case the first power source 30 may provide the 1.8V dc voltage, and the second power source 40 may provide the 3.3V dc voltage. It can be understood that in practical application, the corresponding first power supply and second power supply can be selected according to the operation requirement of the electric load, and the specific values of the working voltages output by the first power supply and the second power supply are not limited in the application.

Based on the connection relationship, the driving circuit 10 drives the switching circuit 20 to communicate with the first power supply 30 and the electric load 50, thereby realizing the supply of the first operating voltage to the electric load 50 by the first power supply 30, or the driving circuit 10 drives the switching circuit 20 to communicate with the second power supply 30 and the electric load 50, thereby realizing the supply of the second operating voltage to the electric load 50 by the second power supply 40. In practical applications, the driving circuit 10 may switch the first power supply 30 or the second power supply 40 to supply power to the power consumption load 50 through the switching circuit 20 according to the actual power consumption requirement of the power consumption load 50, so as to complete the switching of the working voltage.

It should be noted that, the timing control of the driving circuit 10 to drive the switching circuit to switch the power may be implemented in various manners, for example, the driving circuit 10 receives an external control signal, and switches the power in response to the control signal, for example, the driving circuit 10 controls the power switching based on its own control logic, which is not further described herein. Of course, in the specific implementation process of the driving circuit 10 for controlling the power switching based on the control logic thereof, that is, the control logic for determining when and how to switch the power is implemented based on the operation requirement of the electric load 50 and the related technology, the present application does not improve the control algorithm, and the present application is not limited thereto.

In summary, by the power supply switching circuit provided by the application, the communication states of the first power supply and the second power supply and the power consumption load can be switched, and as the working voltages output by the first power supply and the second power supply are different, different working voltages can be provided for the power consumption load, so that the actual operation requirement of the power consumption load is met.

Further, referring to fig. 2, fig. 2 is a block diagram of another power switching circuit according to the present application, in which, based on the embodiment shown in fig. 1, the driving circuit 10 includes a first driving sub-circuit 110 and a second driving sub-circuit 120, and the switching circuit 20 includes a first controllable switch 210 and a second controllable switch 220.

Referring to fig. 2, an input terminal of the first controllable switch 210 is used as a first power terminal of the switch circuit 20 and is connected to the first power source 30; correspondingly, the input terminal of the second controllable switch 220 is used as a second power terminal of the switching circuit 20 and is connected to the second power source 40. The output terminals of the first controllable switch 210 and the second controllable switch 220 are respectively used as load terminals of the switch circuit 20 and are connected to the electric load 50. The driving terminals of the first controllable switch 210 and the second controllable switch 220 are respectively used as the driving terminals of the switching circuit 20. Based on the above connection, when the first controllable switch 210 is turned on, the first power source 30 and the electric load 50 are connected, and when the second controllable switch 220 is turned on, the second power source 40 and the electric load 50 are connected.

Further, the input terminals of the first driving sub-circuit 110 and the second driving sub-circuit 120 of the driving circuit 10 are respectively connected to the third power supply 60. It should be noted that, in order to conveniently represent the connection relationship between the first driving sub-circuit 110 and the second driving sub-circuit 120 and the third power supply 60, fig. 2 shows two third power supplies, and in practical application, the two third power supplies shown in fig. 2 are the same power supply, and two independent power supply sources are not provided.

In an alternative embodiment, the third power supply 60 is the same power supply as the first power supply 30, i.e. the driving circuit 10 shares the first power supply 30 with the switching circuit 20. In another alternative embodiment, the third power supply 60 may also be the same power supply as the second power supply 40, i.e. the driving circuit 10 shares the second power supply 40 with the switching circuit 20. The number of the power supplies can be reduced by sharing the power supplies, which is helpful for simplifying the circuit topology and reducing the overall cost of the circuit.

The output terminals of the first driving sub-circuit 110 and the second driving sub-circuit 120 are respectively connected to the switch circuit 20. Specifically, the output terminal of the first driving sub-circuit 110 is connected to the driving terminal of the first controllable switch 210, and the output terminal of the second driving sub-circuit 120 is connected to the driving terminal of the second controllable switch 220.

Based on the connection relationship, the first driving sub-circuit 110 converts the output voltage of the third power supply 60 into a first driving signal in response to the first control signal, and drives the first controllable switch 210 in the switch circuit 20 to communicate with the first power supply 30 and the power load 50 through the first driving signal; accordingly, the second driving sub-circuit 120 converts the output voltage of the third power supply 60 into a second driving signal in response to the second control signal, and drives the second controllable switch 220 in the switching circuit 20 to communicate with the second power supply 40 and the power load 50 through the second driving signal.

It should be noted that, the first control signal and the second control signal may be obtained in various manners, for example, may be provided by an upper computer, for example, a controller may be integrated in the driving circuit, and the controller outputs the first control signal or the second control signal. Of course, other implementations are possible and are not described in detail herein.

It should be further noted that, in practical application, only one control signal exists in the first control signal and the second control signal at the same time, so that the power supply switching circuit provided in this embodiment only responds to one control signal of the two signals, thereby avoiding the first power supply and the second power supply from being connected with the power utilization load at the same time, ensuring the power supply safety of the power utilization load, and avoiding the current backflow between the first power supply and the second power supply.

In summary, in the power supply switching circuit provided in this embodiment, the switching circuit includes the first controllable switch and the second controllable switch, the communication between the first power supply and the power consumption load is implemented by the first controllable switch, the communication between the second power supply and the power consumption load is implemented by the second controllable switch, the communication between the power consumption load and the power supply is controlled by different controllable switches, and the communication process is relatively independent, so that the mutual influence between the controllable switches can be avoided. Further, the driving circuit comprises a first driving sub-circuit and a second driving sub-circuit, the first driving sub-circuit drives the switching circuit to be communicated with the first power supply and the electric load, the second driving sub-circuit drives the switching circuit to be communicated with the second power supply and the electric load, and the switching circuit is communicated with the power supply and the electric load.

Further, the present application provides a circuit topology of a power switching circuit based on the embodiment shown in fig. 2.

Referring to fig. 3, in the power switching circuit provided in this embodiment, the first controllable switch 210 includes a switching tube Q1, and the second controllable switch 220 includes a switching tube Q2. In the present embodiment, the first controllable switch 210 and the second controllable switch 220 are both implemented based on MOS (Metal-Oxide-Semiconductor) transistors. Of course, in practical applications, the implementation may be based on other types of controllable switching transistors, such as IGBT (Insulated Gate Bipolar Transistor ) transistors, etc., which are not listed here one by one, and are also within the scope of the protection of the present application without exceeding the core concept of the present application.

Specifically, the source of the switching tube Q1 is connected to the first power supply 30 as the input end of the first controllable switch 210, the drain of the switching tube Q1 is connected to the power load 50 as the output end of the first controllable switch 210, and the gate of the switching tube Q1 is connected to the first driving sub-circuit 110 as the driving end of the first controllable switch 210. Correspondingly, the source electrode of the switching tube Q2 is used as the input end of the second controllable switch 220, connected with the second power supply 40, the drain electrode of the switching tube Q2 is used as the output end of the second controllable switch 220, connected with the electric load 50, and the gate electrode of the switching tube Q2 is used as the driving end of the second controllable switch 220, connected with the second driving sub-circuit 120.

In an alternative embodiment, the operating voltage of the first power supply 30 is less than the operating voltage of the second power supply 40, for example, the operating voltage of the first power supply 30 is 1.8V and the operating voltage of the second power supply 40 is 3.3V. In this case, the switching tube Q1 is an N-type MOS tube, and the switching tube Q2 is a P-type MOS tube. The N-type MOS tube is used to control the communication between the first power supply 30 and the power load 50, the P-type MOS tube is used to control the communication between the second power supply 40 and the power load 50, and meanwhile, the operating voltage of the first power supply 30 is smaller than that of the second power supply 40.

In another possible embodiment, the first controllable switch 210, i.e. the switching transistor Q1, uses a MOS transistor without a body diode, and correspondingly, the second controllable switch 220, i.e. the switching transistor Q2, uses a MOS transistor without a body diode. In this case, no matter the first power supply 30 or the second power supply 40 is communicated with the power load 50, current flowing backward between the power supplies can be effectively prevented, and the operation safety of the power supply switching circuit can be improved.

Further, the present embodiment also provides alternative implementations of the first drive sub-circuit 110 and the second drive sub-circuit 120.

As shown in fig. 3, the first driving sub-circuit 110 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is used as an input end of the first driving sub-circuit 110 and is connected to the third power supply 60, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is used for receiving the first control signal, and the connection point of the first resistor R1 and the second resistor R2 is used as an output end of the first driving sub-circuit 110 and is connected to the driving end of the first controllable switch 210.

On the basis of this, the first driving sub-circuit 110 provided in this embodiment further includes a second diode D2, where, as shown in fig. 3, an anode of the second diode D2 is connected to one end of the second resistor R2, and in this case, a cathode of the second diode D2 is used to receive the first control signal. By setting the second diode D2, it can be ensured that the voltage at the point a in fig. 3 defaults to raise the voltage drop of one diode, in this case, in the voltage dividing circuit obtained by connecting the first resistor R1 and the second resistor R2 in series, the second resistor R2 only needs to share a smaller voltage to meet the requirement of driving the switching tube Q1, so that the selection of the first resistor R1 and the second resistor R2 is more flexible.

The second driving sub-circuit 120 includes a third resistor R3 and a first diode D1, where one end of the third resistor R3 is used as an input end of the second driving sub-circuit 120 and connected to the third power supply 60, the other end of the third resistor R3 is connected to an anode of the first diode D1, a cathode of the first diode D1 is used to receive the second control signal, and a connection point of the third resistor R3 and the first diode D1 is used as an output end of the second driving sub-circuit 120 and connected to the driving end of the second controllable switch 220.

Based on the implementation manner of the driving circuit 10, the first driving sub-circuit 110 and the second driving sub-circuit 120 provided in the embodiment can flexibly adapt to the voltage switching requirements of various scenarios. Taking the first driving sub-circuit 110 as an example, in practical application, by adjusting the resistances of the first resistor R1 and the second resistor R2, the current flowing through the second diode D2 can be changed, so as to adjust the voltage drop across the second diode. After the resistance values of the first resistor R1 and the second resistor R2 are adjusted, the voltage output by the voltage dividing circuit composed of the first resistor R1 and the second resistor R2, namely the voltage at the point a, is also changed. Specifically, increasing the resistance of the first resistor R1 and the second resistor R2 will decrease the current flowing through the first resistor R1, the second resistor R2 and the second diode D2, and the voltage drop of the second diode D2 will be reduced at the same time; conversely, decreasing the resistance of the first resistor R1 and the second resistor R2 increases the current flowing through the first resistor R1, the second resistor R2, and the second diode D2, and the voltage drop across the second diode D2 increases. The adjustment of the second drive sub-circuit 120 is similar to that described above and will not be repeated here.

It can be appreciated that the driving circuit provided in this embodiment is built based on simple components such as resistors and diodes, and has a simple circuit structure, low cost of components used, small occupied circuit board area, and capability of effectively reducing the overall cost of the power switching circuit, and the stability of the elements such as resistors and diodes is high, so that the anti-interference capability is strong, and the operation stability and anti-electromagnetic interference performance of the driving circuit are improved.

Further, in the power switching circuit provided in the present embodiment, the driving circuit 10 further includes a first controller 130. As shown in fig. 3, the first controller 130 is connected to the first driving sub-circuit 110 and the second driving sub-circuit 120, and the first controller 130 is mainly configured to output the first control signal or the second control signal. As a preferred embodiment, the first controller 130 outputs the first control signal or the second control signal through the same control port, so that it is possible to avoid occupying excessive port resources of the first controller 130. In another possible implementation, the first controller 130 may output the first control signal through the first control port, or output the second control signal through the second control port, i.e. occupy two port resources to achieve the output of the control signal, which is also optional in case the first controller port resources are sufficient.

In this embodiment, the driving circuit is further provided with a first controller, and the first controller outputs a first control signal for driving the first driving sub-circuit or outputs a second control signal for driving the second driving sub-circuit, so that the control signal is generated by the driving circuit itself, interaction with an external controller or an upper computer can be avoided, the control process of the switching circuit is more direct, the signal transmission path is shortened, the possibility of being interfered by the outside can be effectively reduced, and the operation reliability of the power switching circuit is improved.

The operation of the power switching circuit according to the present embodiment will be explained with reference to the circuit topology shown in fig. 3.

The working voltage output by the first power supply 30 is 1.8V, the working voltage output by the second power supply 40 is 3.3V, the working voltage output by the third power supply 60 is 3.3V, the first control signal output by the first controller 130 is high level, the amplitude is 1.8V, the second control signal output is low level, and the amplitude is 0V. The first controllable switch 210 is an N-type MOS transistor, and the second controllable switch 220 is a P-type MOS transistor.

In the case where the first controller 130 outputs the first control signal, since the level amplitude of the first control signal is smaller than the amplitude of the output voltage of the third power supply 60, the first diode D1 and the second diode D2 are both in the on state, based on which the sum (the point a voltage) of the voltages of the second diode D2 and the second resistor R2, that is, the first driving signal obtained by the first driving sub-circuit 110 converting the output voltage of the third power supply 60, the first controllable switch 210 is turned on, and the first power supply 30 provides the operating voltage of 1.8V to the electric load 50 since the voltage amplitude of the first driving signal is greater than the turn-on voltage of the N-type MOS transistor Q1. Meanwhile, the first diode D1 is turned on, the voltage (the voltage at the point B) at the connection point of the first diode D1 and the third resistor R3 is the sum of the voltage corresponding to the first control signal and the voltage drop of the first diode D1, the voltage is insufficient to meet the on condition of the P-type MOS transistor Q2, the second controllable switch 220 is in the off state, and the second power supply 40 cannot supply power to the power load 50.

In the case that the first controller 130 outputs the second control signal, that is, outputs 0V, the first diode D1 and the second diode D2 are also in the on state, unlike the foregoing, since the first controller 130 outputs 0V, the sum (a point voltage) of the voltages of the second diode D2 and the second resistor R2 is smaller than the on voltage of the N-type MOS transistor Q1, the first controllable switch 210 is turned off, and the first power supply 30 cannot provide the operating voltage of 1.8V with the electric load 50. Meanwhile, the first diode D1 is turned on, the voltage (B-point voltage) at the connection point of the first diode D1 and the third resistor R3 is the sum of the voltage corresponding to the second control signal and the voltage drop of the first diode D1, and of course, the B-point voltage is also the second driving signal obtained by the second driving sub-circuit converting the output voltage of the third power supply 60, the voltage is sufficient to meet the on condition of the P-type MOS Q2, the second controllable switch 220 is turned on, and the second power supply 40 provides the working voltage for the power load 50. Thus, the switching of the power supply is completed.

Further, the present application also provides another power switching circuit, and in the power switching circuit provided in this embodiment, the driving circuit 10 includes a second controller 140 as shown in fig. 4. The switching circuit is illustrated by way of example in the embodiment shown in fig. 3.

The second controller 140 is connected to the driving terminals of the first controllable switch 210 and the second controllable switch 220, respectively, and the second controller 140 is configured to output a third driving signal or a fourth driving signal. The third driving signal is used for driving the first controllable switch 210 in the switching circuit to be turned on so as to communicate the first power supply 30 and the power consumption load 50, and the first power supply 30 provides an operating voltage for the power consumption load 50; the fourth driving signal is used for driving the second controllable switch 220 in the switching circuit to be turned on so as to communicate the second power supply 40 and the power consumption load 50, and the second power supply 40 provides an operating voltage for the power consumption load 50.

Similar to the configuration of the first controller 130 described above, the second controller 140 may output the third driving signal or the fourth driving signal through the same control port, may output the third driving signal through the first control port, and may output the fourth driving signal through the second control port.

The operation of the power switching circuit according to the present embodiment will be explained with reference to the circuit topology shown in fig. 4.

The working voltage output by the first power supply 30 is 1.8V, the working voltage output by the second power supply 40 is 3.3V, the third driving signal output by the second controller 140 is high level, the amplitude is 3.3V, the fourth driving signal output is low level, and the amplitude is 0V. The first controllable switch 210 is an N-type MOS transistor, and the second controllable switch 220 is a P-type MOS transistor.

Under the condition that the second controller 140 outputs the third driving signal, based on the conduction characteristic of the MOS transistor, the switching transistor Q1 is turned on, that is, the first controllable switch 210 is turned on, and the first power supply 30 and the power consumption load 50 are connected, and the first power supply 30 provides an operating voltage of 1.8V for the power consumption load 50, at this time, the second controllable switch 220, that is, the switching transistor Q2 is turned off.

In the case where the second controller 140 outputs the fourth driving signal, the switching tube Q1 is turned off, i.e., the first controllable switch 210 is turned off; correspondingly, the switch tube Q2 is turned on, that is, the second controllable switch 220 is turned on, so that the second power supply 40 and the electric load 50 are communicated, and the second power supply 40 provides an operating voltage of 3.3V for the electric load 50.

Furthermore, in the power supply switching circuit provided in the foregoing embodiments, the switching voltages of the switching tube Q1 and the switching tube Q2 are different, so that the risk of simultaneous switching on of the switching tube Q1 and the switching tube Q2 can be avoided in the switching stage, which is beneficial to improving the overall safety and reliability of the circuit.

The application also provides an electronic device comprising a first power supply, a second power supply, a third power supply, an electric load, and a power supply switching circuit according to any of the above embodiments of the application, wherein,

Those skilled in the art will appreciate that various modifications and improvements can be made to the disclosure. For example, the various devices or components described above may be implemented in hardware, or may be implemented in software, firmware, or a combination of some or all of the three.

Further, while the present disclosure makes various references to certain elements in a system according to embodiments of the present disclosure, any number of different elements may be used and run on a client and/or server. The units are merely illustrative and different aspects of the systems and methods may use different units.

Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The foregoing is illustrative of the present disclosure and is not to be construed as limiting thereof. Although a few exemplary embodiments of this disclosure have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this disclosure. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the claims. It is to be understood that the foregoing is illustrative of the present disclosure and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The disclosure is defined by the claims and their equivalents.

Claims

1. A power switching circuit, comprising:

The driving circuit is connected with the switch circuit;

2. The power supply switching circuit according to claim 1, wherein the driving circuit includes: a first drive sub-circuit and a second drive sub-circuit, wherein,

3. The power switching circuit of claim 2 wherein the first drive sub-circuit comprises: a first resistor and a second resistor, wherein

4. The power switching circuit of claim 2 wherein the second drive sub-circuit comprises: a third resistor and a first diode, wherein,

the cathode of the first diode is used for receiving the second control signal;

5. The power supply switching circuit according to claim 2, wherein the driving circuit further comprises: a first controller, wherein,

6. The power switching circuit according to claim 1, wherein the driving circuit includes a second controller, wherein,

7. The power switching circuit according to claim 1, wherein the switching circuit comprises a first controllable switch and a second controllable switch, wherein,

8. The power switching circuit of claim 7, wherein an operating voltage of the first power supply is less than an operating voltage of the second power supply;

9. The power switching circuit of claim 7 wherein the first controllable switch comprises a MOS transistor without a body diode and the second controllable switch comprises a MOS transistor without a body diode.

10. An electronic device, comprising: the first power supply, the second power supply, the third power supply, the electric load, and the power supply switching circuit according to any one of claims 1 to 9,