CN213402558U - Power supply switching circuit - Google Patents
Power supply switching circuit Download PDFInfo
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- CN213402558U CN213402558U CN202022218743.XU CN202022218743U CN213402558U CN 213402558 U CN213402558 U CN 213402558U CN 202022218743 U CN202022218743 U CN 202022218743U CN 213402558 U CN213402558 U CN 213402558U
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Abstract
A power supply switching circuit belongs to the technical field of circuit control. The power supply switching circuit comprises a first power supply circuit and a second power supply circuit, wherein the first power supply circuit comprises a first power supply unit and a first switching unit, the second power supply circuit comprises a second power supply unit and a second switching unit, a first terminal of the first power supply unit is electrically connected with a first terminal of the first switching unit, and a second terminal of the first switching unit is electrically connected with a second terminal of the second switching unit. This application preferentially uses first supply circuit (the DC power supply that charges) to come for the consumer supplies power, only when first supply circuit does not have the electric energy, just switches to second supply circuit (lithium cell) and supplies power for the consumer, like this, can supply power for the consumer better to improve the work efficiency of consumer, and promote the life of battery.
Description
Technical Field
The application relates to the technical field of circuit control, in particular to a power supply switching circuit.
Background
With the development of society and the progress of science and technology, the application of intelligent equipment in people's daily life is more and more extensive, but, the in-process that can only consumer exists a problem, that is the consumer needs very big power in the course of working, only relies on the power supply of low pressure lithium cell, can produce a large amount of heats, and leads to the machine high temperature, arouses a series of problems, and the battery life also can receive certain influence.
In the prior art, a large amount of power is needed in the working process of an electric device such as a printer, and only the power supply of a low-voltage lithium battery is needed, so that a large amount of heat can be generated while the printing effect is not good, the temperature of the electric device is too high, and therefore a series of problems cause that the service life of a printer battery is also influenced to a certain extent.
Disclosure of Invention
In view of this, an embodiment of the present application provides at least a power supply switch, where a power supply circuit and a second power supply circuit are installed, and a first power supply unit and a first switch unit are installed in the first power supply circuit and a second power supply unit and a second switch unit are installed in the second power supply circuit to provide electric energy for an electric device, so as to ensure that when the first power supply unit is powered at noon, the standby second power supply unit can automatically continue to supply power to the electric device, thereby greatly prolonging the service life of a battery, reducing heat generated in a battery conversion process, and further improving the working efficiency of the electric device.
The application mainly comprises the following aspects:
in a first aspect, an embodiment of the present application provides a power switching circuit, which includes a first power supply circuit and a second power supply circuit, where the first power supply circuit includes a first power supply unit and a first switching unit, the second power supply circuit includes a second power supply unit and a second switching unit, a first terminal of the first power supply unit is electrically connected to a first terminal of the first switching unit, a second terminal of the first power supply unit is grounded, a second terminal of the first switching unit is electrically connected to a second terminal of the second switching unit, a first terminal of the second switching unit is electrically connected to a first terminal of the second power supply unit, and a third terminal of the first switching unit and a third terminal of the second switching unit are electrically connected to electrical equipment, respectively;
the first switching unit is used for transmitting the electric energy provided by the first power supply unit to electric equipment when the first power supply unit is detected to have electric quantity;
and the second switching unit is used for transmitting the electric energy of the second power supply unit to the electric equipment when detecting that the first power supply unit can not provide the electric quantity.
In a possible implementation manner, the first switching unit includes a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, and a third resistor, two ends of the third resistor are electrically connected to a gate and a drain of the second MOS transistor, respectively, a second terminal of the first resistor is connected in series with a first terminal of the second resistor, a second terminal of the second resistor is electrically connected to a ground terminal of the first switching unit, a first terminal of the first resistor is connected in parallel with a source of the second MOS transistor, the first resistor is electrically connected to a first terminal of the first power supply unit, a gate of the second MOS transistor is electrically connected to a source of the first MOS transistor, a gate of the first MOS transistor is electrically connected to a second terminal of the second resistor, a gate of the first MOS transistor is electrically connected to a second terminal of the second switching unit, and a drain of the first MOS transistor is grounded, and the drain electrode of the second MOS tube is electrically connected with electric equipment.
In a possible implementation manner, the second switching unit includes a third MOS transistor, a fourth resistor, and a switching power supply, an input terminal of the switching power supply is electrically connected to the first terminal of the second power supply, the first terminal of the fourth resistor is electrically connected to the gate of the third MOS transistor, a control signal terminal of the switching power supply is electrically connected to the drain of the third MOS transistor, a source terminal of the third MOS transistor is electrically connected to the second terminal of the fourth resistor, and the gate of the third MOS transistor is electrically connected to the gate of the first MOS transistor in the first switching unit.
In a possible implementation manner, when the first power supply unit in the first power supply circuit supplies power to the electrical device, the current in the first power supply unit flows through the first resistor, then flows through the gate of the first MOS transistor, flows out through the source of the first MOS transistor, flows into the gate of the second MOS transistor, and flows out from the drain of the second MOS transistor to be electrically connected to the electrical device, so as to supply power to the electrical device.
In a possible implementation manner, when the power in the first power supply unit in the first power supply circuit is too low or no power, the power of the second power supply unit in the second power supply circuit is shunted to the third MOS transistor and the input terminal of the switching power supply, and the power flowing through the gate of the third MOS transistor flows out through the drain of the third MOS transistor and flows out through the control terminal of the switching power supply and the output terminal of the switching power supply. And supplying power to the electric equipment.
In a possible implementation manner, the power switching circuit further includes a microcontroller, an input end of the microcontroller is electrically connected to the third terminal of the first switching unit and the third terminal of the second switching unit, respectively, an output end of the microcontroller is electrically connected to the electrical device, and the microcontroller is configured to receive an electrical signal of the first switching unit or the second switching unit, convert the input electrical signal into an output control signal, and control the electrical device to operate.
In a possible implementation manner, the power switching circuit further includes a third switching unit, the third switching unit includes a triode and a fifth resistor, a base of the triode is electrically connected to the output terminal of the microcontroller, an emitter of the triode is grounded, two ends of the fifth resistor are respectively electrically connected to the base and the collector of the triode, and a collector of the triode is electrically connected to the power consumption device.
In one possible implementation manner, the third switching unit further includes a fourth MOS transistor, a gate terminal of the fourth MOS transistor is electrically connected to the collector of the triode, a source of the fourth MOS transistor is electrically connected to the third terminal of the first switching unit and the third terminal of the second switching unit, and a drain of the fourth MOS transistor is electrically connected to the electrical device.
In a possible implementation manner, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor are all PMOS transistors, and the first MOS transistor is an NMOS transistor.
In a possible implementation manner, diodes are connected in parallel between the drain and the source of each of the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor.
In the embodiment of the application, the first power supply circuit and the second power supply circuit are installed, the first power supply unit and the first switching unit are installed in the first power supply circuit, and the second power supply unit and the second switching unit are installed in the second power supply circuit to supply power to the electric equipment, so as to ensure that the standby second power supply unit can automatically supply power to the electric equipment continuously when no electric quantity exists in the first power supply unit, thereby greatly prolonging the service life of the battery, and reduces the heat generated in the battery conversion process, further improves the working efficiency of the electric equipment, and the level of the electric quantity output by the first power supply unit and the second power supply unit can be accurately matched with the electric equipment by the first switching unit and the second switching unit, so that the service life of the electric equipment is prolonged, and the use stability of the electric equipment is improved.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows a block diagram of a power switching circuit provided in an embodiment of the present application;
fig. 2 is a circuit diagram of a power switching circuit provided in an embodiment of the present application;
fig. 3 is a circuit diagram of another power switching circuit provided in an embodiment of the present application;
fig. 4 shows a circuit diagram of another power switching circuit provided in an embodiment of the present application.
Description of the main element symbols:
in the figure: 100-a first power supply circuit; 110-a first power supply unit; 120-a first switching unit; 200-a second supply circuit; 210-a second power supply unit; 220-a second switching unit; 300-a microcontroller; 400-third switching unit.
Detailed Description
To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for illustrative and descriptive purposes only and are not used to limit the scope of protection of the present application. Additionally, it should be understood that the schematic drawings are not necessarily drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be performed out of order, and that steps without logical context may be performed in reverse order or concurrently.
In addition, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
To enable one skilled in the art to utilize the present disclosure, the following embodiments are presented in conjunction with a specific application scenario, "elevator switching circuit," which is within the spirit and scope of the present application and the general principles defined herein may be applied to other embodiments and application scenarios by one skilled in the art.
The system and the method provided by the embodiment of the present application can be applied to any scene that needs to perform delayed power supply, the embodiment of the present application does not limit a specific application scene, and any scheme using the power switching circuit provided by the embodiment of the present application is within the protection scope of the present application.
It should be noted that, before the present application is proposed, in the prior art, a user needs a large amount of power during the operation of an electric device, such as a printer, and only relies on the power supply of a low-voltage lithium battery, so that the printing effect is not good and a large amount of heat is generated, resulting in an excessively high temperature, and therefore, a series of problems result, so that the service life of the battery of the printer is also affected to a certain extent.
In view of the above problem, an embodiment of the present application provides a power switching circuit, preferentially use first power supply circuit (charging dc power supply) to supply power for consumer, only when first power supply does not have the electric energy, just switch to second power supply circuit (lithium cell) and supply power for consumer, like this, can supply power for consumer better to improve the work efficiency of consumer, and promote the life of battery.
For the convenience of understanding of the present application, the technical solutions provided in the present application will be described in detail below with reference to specific embodiments.
Referring to fig. 1, fig. 1 is a block diagram of a power switching circuit according to an embodiment of the present disclosure. As shown in fig. 1, a power switching circuit provided in this embodiment of the present application includes a first power supply circuit 100 and a second power supply circuit 200, the first power supply circuit 100 includes a first power supply unit 110 and a first switching unit 120, the second power supply circuit 200 includes a second power supply unit 210 and a second switching unit 220, the first terminal of the first power supply unit 110 is electrically connected to the first terminal of the first switching unit 120, the second terminal of the first power supply unit 110 is grounded, the second terminal of the first switching unit 120 is electrically connected to the second terminal of the second switching unit 220, a first terminal of the second switching unit 220 is electrically connected to a first terminal of the second power supplying unit 210, the third terminal of the first switching unit 120 and the third terminal of the second switching unit 220 are electrically connected to the electric devices, respectively.
In a specific embodiment, in the process of supplying power to the electrical device, under a normal condition, the first power supply unit 110 in the first power supply circuit 100 supplies power to the electrical device through the first switching unit 120, wherein the second switching unit 220 is not turned on, when the electric quantity in the first power supply unit 110 is insufficient or no electric quantity, the first switching unit 120 in the first power supply circuit 100 switches to the second switching unit 220, so that the second switching unit 220 is turned on, and at this time, the electrical device supplies power to the electrical device through the second power supply unit 210 in the second power supply circuit 200.
The first power supply unit 110 is specifically a chargeable and dischargeable DC charging device, the second power supply unit 210 is a battery, and the type, size, specification and model of the electric device can be configured according to the voltage values of the first power supply unit 110 and the second power supply unit 210.
The first switching unit 120 is configured to transmit the electric energy provided by the first power supply unit 110 to an electric device when it is detected that the first power supply unit 110 has electric energy.
In a specific embodiment, when the first switching unit 120 detects that the first power supply unit 110 has electric power, the electric power of the first power supply unit 110 is transmitted to the electric equipment through the first power supply switching unit, and the first power supply switching unit functions to convert the electric power output by the first power supply unit 110 from a high level to a low level, so that the electric energy can not be output stably by the electric equipment.
The second switching unit 220 is configured to transmit the electric energy of the second power supply unit 210 to an electric device when it is detected that the first power supply unit 110 cannot provide electric energy.
In a specific embodiment, when the power in the first power supply unit 110 in the first power supply circuit 100 is too low or no power, the power output of the second power supply unit 210 in the second power supply circuit 200 supplies power to the prime number of electric devices, and the second power supply switching unit functions to convert the power output by the second power supply unit 210 from a high level to a low level, so that the electric devices can not output power stably.
The power supply switching circuit that this application embodiment provided compares with the switching circuit among the prior art, and this application preferentially uses first supply circuit (the DC power supply that charges) to supply power for consumer, only when first supply circuit does not have the electric energy, just switches to second supply circuit (lithium cell) and supplies power for consumer, like this, can be better for consumer power supply to improve consumer's work efficiency, and promote the life of battery.
Referring to fig. 2, fig. 2 is a circuit diagram of a power switching circuit according to an embodiment of the present disclosure. As shown in fig. 2, the power switching circuit provided in the embodiment of the present application includes a first power supply circuit 100 and a second power supply circuit 200, the first power supply circuit 100 includes a first power supply unit 110 and a first switching unit 120, the second power supply circuit 200 includes a second power supply unit 210 and a second switching unit 220, the first terminal of the first power supply unit 110 is electrically connected to the first terminal of the first switching unit 120, the second terminal of the first power supply unit 110 is grounded, the second terminal of the first switching unit 120 is electrically connected to the second terminal of the second switching unit 220, a first terminal of the second switching unit 220 is electrically connected to a first terminal of the second power supplying unit 210, the third terminal of the first switching unit 120 and the third terminal of the second switching unit 220 are electrically connected to the electric devices, respectively.
The first switching unit 120 is configured to transmit the electric energy provided by the first power supply unit 110 to an electric device when it is detected that the first power supply unit 110 has electric energy.
The second switching unit 220 is configured to transmit the electric energy of the second power supply unit 210 to an electric device when it is detected that the first power supply unit 110 cannot provide electric energy.
The first switching unit 120 includes a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2, and a third resistor R3, wherein two ends of the third resistor R3 are electrically connected to a gate and a drain of the second MOS transistor Q2, respectively, a second terminal of the first resistor R1 is connected in series with a first terminal of the second resistor R2, a second terminal of the second resistor R2 is electrically connected to a ground terminal of the first switching unit 120, a first terminal of the first resistor R1 is connected in parallel to a source of the second MOS transistor Q2, the first resistor R1 is electrically connected to a first terminal of the first power supply unit 110, a gate of the second MOS transistor Q2 is electrically connected to a source of the first MOS transistor Q1, a gate of the first MOS transistor Q1 is electrically connected to a second terminal of the second resistor R2, and a gate terminal of the first MOS transistor Q1 is electrically connected to the second switching unit 220, the drain electrode of the first MOS tube Q1 is grounded, and the drain electrode of the second MOS tube Q2 is electrically connected with electric equipment.
In a specific embodiment, the output power of the first power supply unit 110 flows through the first resistor R1 and the second resistor R2, and the current shunted by the second resistor R2 flows in through the gate of the first MOS transistor Q1, flows out through the source of the first MOS transistor Q1, flows into the gate of the second MOS transistor Q2, and flows out through the drain of the second MOS transistor Q2 to supply power to the electric device.
The first resistor R1R1 and the third resistor R3 are pull-up resistors, and the second resistor R2R2 is a pull-down resistor, so that the voltage flowing through the second switching unit 220 is pulled high by the pull-up resistor existing inside the second switching unit 220, and the current flowing through the second switching unit 220 is controlled to be cut off, so that the electric device is powered by the first power supply unit 110.
The second switching unit 220 includes a third MOS transistor Q3, a fourth resistor and a switching power supply, an input terminal of the switching power supply is electrically connected to the first terminal of the second power supply, the first terminal of the fourth resistor is electrically connected to the gate of the third MOS transistor Q3, a control signal terminal of the switching power supply is electrically connected to the drain of the third MOS transistor Q3, the source terminal of the third MOS transistor Q3 is electrically connected to the second terminal of the fourth resistor, and the gate of the third MOS transistor Q3 is electrically connected to the gate of the first MOS transistor Q1 in the first switching unit 120.
In a specific embodiment, when the power in the first power supply unit 110 is too low or no power, the second power supply circuit 200 in the second power supply unit 210 directly flows a part of the output power into the input terminal of the switching power supply, and a part of the output power flows into the gate of the third MOS transistor Q3Q3 via the fourth resistor R4 and flows out to the control signal terminal of the switching power supply via the drain of the third MOS transistor Q3 to supply power to the electric device.
Since the fourth resistor R4 is a pull-up resistor, when the second power supply unit 210 shunts through the fourth resistor R4 and the second resistor R2R2, the voltage flowing through the first switching unit 120 is pulled down by the pull-down resistor of the second resistor R2R2, so as to control the current flowing through the first switching unit 120 to be cut off, and the electric quantity output by the second power supply circuit 200 directly flows into the switching power supply through the third MOS transistor Q3, and the switching power supply boosts the flowing electric quantity, so that the voltage of the first power supply unit 110 flowing out to supply power to the electric device is consistent.
Due to the pull-up resistor inside the second switching unit 220, the voltage flowing through the second switching unit 220 is pulled high by the pull-up resistor inside, and the current flowing through the second switching unit 220 is controlled to be cut off, so that the electric device is powered by the first power supply unit 110.
The power supply switching circuit that this application embodiment provided compares with the switching circuit among the prior art, and this application preferentially uses first supply circuit (the DC power supply that charges) to supply power for consumer, only when first supply circuit does not have the electric energy, just switches to second supply circuit (lithium cell) and supplies power for consumer, like this, can be better for consumer power supply to improve consumer's work efficiency, and promote the life of battery.
Referring to fig. 3, fig. 3 is a second circuit diagram of a power switching circuit according to an embodiment of the present application. As shown in fig. 3, a power switching circuit provided in the embodiment of the present application includes a first power supply circuit 100 and a second power supply circuit 200, the first power supply circuit 100 includes a first power supply unit 110 and a first switching unit 120, the second power supply circuit 200 includes a second power supply unit 210 and a second switching unit 220, the first terminal of the first power supply unit 110 is electrically connected to the first terminal of the first switching unit 120, the second terminal of the first power supply unit 110 is grounded, the second terminal of the first switching unit 120 is electrically connected to the second terminal of the second switching unit 220, a first terminal of the second switching unit 220 is electrically connected to a first terminal of the second power supplying unit 210, the third terminal of the first switching unit 120 and the third terminal of the second switching unit 220 are electrically connected to the electric devices, respectively.
The first switching unit 120 is configured to transmit the electric energy provided by the first power supply unit 110 to an electric device when it is detected that the first power supply unit 110 has electric energy.
The second switching unit 220 is configured to transmit the electric energy of the second power supply unit 210 to an electric device when it is detected that the first power supply unit 110 cannot provide electric energy.
The first switching unit 120 comprises a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2 and a third resistor R3, a second terminal of the first resistor R1 is connected in series with a first terminal of a second resistor R2, a second terminal of the second resistor R2 is electrically connected to the ground terminal of the first switching unit 120, the first terminal of the first resistor R1 is connected in parallel with the source of the second MOS transistor Q2, the first resistor R1 is electrically connected to the first terminal of the first power supply unit 110, the gate of the second MOS transistor Q2 is electrically connected to the source of the first MOS transistor Q1, the gate of the first MOS transistor Q1 is electrically connected with the second terminal of the second resistor R2, the gate of the first MOS transistor Q1 is electrically connected with the second terminal of the second switching unit 220, the drain electrode of the first MOS tube Q1 is grounded, and the drain electrode of the second MOS tube Q2 is electrically connected with electric equipment.
The second switching unit 220 includes a third MOS transistor Q3, a fourth resistor and a switching power supply, an input terminal of the switching power supply is electrically connected to the first terminal of the second power supply, the first terminal of the fourth resistor is electrically connected to the gate of the third MOS transistor Q3, a control signal terminal of the switching power supply is electrically connected to the drain of the third MOS transistor Q3, the source terminal of the third MOS transistor Q3 is electrically connected to the second terminal of the fourth resistor, and the gate of the third MOS transistor Q3 is electrically connected to the gate of the first MOS transistor Q1 in the first switching unit 120.
Optionally, when the first power supply unit 110 in the first power supply circuit 100 supplies power to the electrical device, the current in the first power supply unit 110 flows through the first resistor R1, then flows through the gate of the first MOS transistor Q1, flows out through the source of the first MOS transistor Q1, flows into the gate of the second MOS transistor Q2, and flows out through the drain of the second MOS transistor Q2 to be electrically connected to the electrical device, so as to supply power to the electrical device.
In a specific embodiment, when the first power supply unit 110 in the first power supply circuit 100 supplies power to the electrical device, the power in the first power supply unit 110 flows through the first resistor R1R1 connected in series with the second resistor R2 and then is shunted to the gate of the first MOS transistor Q1 and the gate of the third MOS transistor Q3, at this time, the level of the gate of the third MOS transistor Q3 is high, the voltage of the third MOS transistor Q3 is raised by the fourth resistor connected to the gate and the source of the third MOS transistor Q3, a part of the current flowing through the third MOS transistor Q3 is controlled to be cut off, and the current flowing through the source of the first MOS transistor Q1 is controlled to flow through the gate of the second MOS transistor Q2, at this time, the level of the gate of the second MOS transistor Q2 is low, so as to stably supply power to the electrical device.
Optionally, when the power in the first power supply unit 110 in the first power supply circuit 100 is too low or no power, the power of the second power supply unit 210 in the second power supply circuit 200 is shunted to the third MOS transistor Q3 and the input terminal of the switching power supply, and the charge pipe flowing through the gate of the third MOS transistor Q3 flows out through the drain of the third MOS transistor Q3 and flows into the control terminal of the switching power supply and flows out through the output terminal of the switching power supply. And supplying power to the electric equipment.
In a specific embodiment, when the power in the first power supply unit 110 in the first power supply circuit 100 is too low or no power, the power of the second power supply unit 210 in the second power supply circuit 200 is shunted to the third MOS transistor Q3 and the first MOS transistor Q1, and the second resistor R2 connected to the gate and the drain of the first MOS transistor Q1 reduces the voltage of the first MOS transistor Q1, so that a part of the current flowing through the first MOS transistor Q1 is cut off, and thus, the switching power supply boosts the flowing voltage by passing through the current passing through the drain of the third MOS transistor Q3 in the second switching circuit, and raises the voltage to the same voltage value as the first power supply unit 110, thereby outputting a high-level voltage to power the electric device.
The first power supply unit 110 may be specifically configured as a charging DC power supply, the second power supply unit 210 may be specifically configured as a lithium battery, and the switching power supply may be specifically configured as a DC-DC +5V voltage value.
The power switching circuit further includes a microcontroller 300, an input end of the microcontroller 300 is electrically connected to the third terminal of the first switching unit 120 and the third terminal of the second switching unit 220, an output end of the microcontroller 300 is electrically connected to the power consumption device, and the microcontroller 300 is configured to receive an electrical signal of the first switching unit 120 or the second switching unit 220, convert the input electrical signal into an output control signal, and control the power consumption device to operate.
In a specific embodiment, the microcontroller 300 receives an electrical signal of the output current of the first switching unit 120 or the second switching unit 220, and the microcontroller 300 converts the input electrical signal into an output control signal through its own analysis and processing, so as to control the operation of the electrical device, thereby ensuring the stability of the normal operation of the electrical device.
The power supply switching circuit that this application embodiment provided compares with the switching circuit among the prior art, and this application preferentially uses first supply circuit (the DC power supply that charges) to supply power for consumer, only when first supply circuit does not have the electric energy, just switches to second supply circuit (lithium cell) and supplies power for consumer, like this, can be better for consumer power supply to improve consumer's work efficiency, and promote the life of battery.
Referring to fig. 4, fig. 4 is a third circuit diagram of a power switching circuit according to an embodiment of the present disclosure. As shown in fig. 4, a power switching circuit provided in the embodiment of the present application includes a first power supply circuit 100 and a second power supply circuit 200, the first power supply circuit 100 includes a first power supply unit 110 and a first switching unit 120, the second power supply circuit 200 includes a second power supply unit 210 and a second switching unit 220, the first terminal of the first power supply unit 110 is electrically connected to the first terminal of the first switching unit 120, the second terminal of the first power supply unit 110 is grounded, the second terminal of the first switching unit 120 is electrically connected to the second terminal of the second switching unit 220, a first terminal of the second switching unit 220 is electrically connected to a first terminal of the second power supplying unit 210, the third terminal of the first switching unit 120 and the third terminal of the second switching unit 220 are electrically connected to the electric devices, respectively.
The first switching unit 120 is configured to transmit the electric energy provided by the first power supply unit 110 to an electric device when it is detected that the first power supply unit 110 has electric energy.
The second switching unit 220 is configured to transmit the electric energy of the second power supply unit 210 to an electric device when it is detected that the first power supply unit 110 cannot provide electric energy.
The first switching unit 120 comprises a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2 and a third resistor R3, a second terminal of the first resistor R1 is connected in series with a first terminal of a second resistor R2, a second terminal of the second resistor R2 is electrically connected to the ground terminal of the first switching unit 120, the first terminal of the first resistor R1 is connected in parallel with the source of the second MOS transistor Q2, the first resistor R1 is electrically connected to the first terminal of the first power supply unit 110, the gate of the second MOS transistor Q2 is electrically connected to the source of the first MOS transistor Q1, the gate of the first MOS transistor Q1 is electrically connected with the second terminal of the second resistor R2, the gate of the first MOS transistor Q1 is electrically connected with the second terminal of the second switching unit 220, the drain electrode of the first MOS tube Q1 is grounded, and the drain electrode of the second MOS tube Q2 is electrically connected with electric equipment.
The second switching unit 220 includes a third MOS transistor Q3, a fourth resistor and a switching power supply, an input terminal of the switching power supply is electrically connected to the first terminal of the second power supply, the first terminal of the fourth resistor is electrically connected to the gate of the third MOS transistor Q3, a control signal terminal of the switching power supply is electrically connected to the drain of the third MOS transistor Q3, the source terminal of the third MOS transistor Q3 is electrically connected to the second terminal of the fourth resistor, and the gate of the third MOS transistor Q3 is electrically connected to the gate of the first MOS transistor Q1 in the first switching unit 120.
The power switching circuit further includes a microcontroller 300, an input end of the microcontroller 300 is electrically connected to the third terminal of the first switching unit 120 and the third terminal of the second switching unit 220, an output end of the microcontroller 300 is electrically connected to the power consumption device, and the microcontroller 300 is configured to receive an electrical signal of the first switching unit 120 or the second switching unit 220, convert the input electrical signal into an output control signal, and control the power consumption device to operate.
The power switching circuit further comprises a third switching unit 400, the third switching unit 400 comprises a triode Q4 and a fifth resistor R5R5, the base of the triode Q4 is electrically connected with the output end of the microcontroller 300, the emitter of the triode Q4 is grounded, two ends of the fifth resistor R5 are electrically connected with the base and the collector of the triode Q4 respectively, and the collector of the triode Q4 is electrically connected with the electric equipment.
In a specific embodiment, the fifth resistor R5 is a pull-down resistor, and the control signal output by the microcontroller 300 flows in through the base of the transistor Q4 and outputs a low level to the collector, so that the microcontroller 300 can supply power to the electric device more stably.
The third switching unit 400 further includes a fourth MOS transistor Q5, a gate terminal of the fourth MOS transistor Q5 is electrically connected to a collector of the triode, a source terminal of the fourth MOS transistor Q5 is electrically connected to the third terminal of the first switching unit 120 and the third terminal of the second switching unit 220, and a drain terminal of the fourth MOS transistor Q5 is electrically connected to the power device.
In a specific embodiment, the fourth MOS transistor Q5 is capable of providing a stable low-level power supply for the electric device.
Optionally, the second MOS transistor Q2, the third MOS transistor Q3, and the fourth MOS transistor Q5 are PMOS transistors, and the first MOS transistor Q1 is an NMOS transistor.
Optionally, diodes are connected in parallel between the drain and the source of each of the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q5.
In a specific embodiment, diodes are connected in parallel between the drain and the source of each of the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q5, so as to protect the silicon dioxide film between the gate and the source of the MOS transistor, prevent breakdown in a natural state, in an electrostatic or charged on-off state, and further prevent breakdown of the MOS transistor due to a reverse transient reverse voltage at a moment when a current flows.
The power supply switching circuit that this application embodiment provided compares with the switching circuit among the prior art, and this application preferentially uses first supply circuit (the DC power supply that charges) to supply power for consumer, only when first supply circuit does not have the electric energy, just switches to second supply circuit (lithium cell) and supplies power for consumer, like this, can be better for consumer power supply to improve consumer's work efficiency, and promote the life of battery.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A power supply switching circuit is characterized by comprising a first power supply circuit and a second power supply circuit, wherein the first power supply circuit comprises a first power supply unit and a first switching unit, the second power supply circuit comprises a second power supply unit and a second switching unit, a first terminal of the first power supply unit is electrically connected with a first terminal of the first switching unit, a second terminal of the first power supply unit is grounded, a second terminal of the first switching unit is electrically connected with a second terminal of the second switching unit, a first terminal of the second switching unit is electrically connected with a first terminal of the second power supply unit, and a third terminal of the first switching unit and a third terminal of the second switching unit are respectively and electrically connected with electric equipment;
the first switching unit is used for transmitting the electric energy provided by the first power supply unit to electric equipment when the first power supply unit is detected to have electric quantity;
and the second switching unit is used for transmitting the electric energy of the second power supply unit to the electric equipment when detecting that the first power supply unit can not provide the electric quantity.
2. The power switching circuit according to claim 1, wherein the first switching unit comprises a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, and a third resistor, two ends of the third resistor are electrically connected to a gate and a drain of the second MOS transistor respectively, a second terminal of the first resistor is connected in series with a first terminal of the second resistor, a second terminal of the second resistor is electrically connected to a ground terminal of the first switching unit, a first terminal of the first resistor is connected in parallel with a source of the second MOS transistor, the first resistor is electrically connected to a first terminal of the first power supplying unit, a gate of the second MOS transistor is electrically connected to a source of the first MOS transistor, a gate of the first MOS transistor is electrically connected to a second terminal of the second resistor, and a gate of the first MOS transistor is electrically connected to a second terminal of the second switching unit, the drain electrode of the first MOS tube is grounded, and the drain electrode of the second MOS tube is electrically connected with electric equipment.
3. The power switching circuit according to claim 2, wherein the second switching unit comprises a third MOS transistor, a fourth resistor, and a switching power supply, an input terminal of the switching power supply is electrically connected to the first terminal of the second power supply unit, the first terminal of the fourth resistor is electrically connected to the gate of the third MOS transistor, the control signal terminal of the switching power supply is electrically connected to the drain of the third MOS transistor, the source terminal of the third MOS transistor is electrically connected to the second terminal of the fourth resistor, and the gate of the third MOS transistor is electrically connected to the gate of the first MOS transistor in the first switching unit.
4. The power switching circuit according to claim 2, wherein when the first power supply unit in the first power supply circuit supplies power to the electrical device, the current in the first power supply unit flows through the first resistor, then flows through the gate of the first MOS transistor, flows out through the source of the first MOS transistor, flows into the gate of the second MOS transistor, and is electrically connected to the electrical device through the drain of the second MOS transistor to supply power to the electrical device.
5. The power switching circuit according to claim 3, wherein when the power in the first power supply unit in the first power supply circuit is too low or no power, the power of the second power supply unit in the second power supply circuit is shunted to the third MOS transistor and the input terminal of the switching power supply, and the power flowing through the gate of the third MOS transistor flows out through the drain of the third MOS transistor and flows into the control terminal of the switching power supply and flows out from the output terminal of the switching power supply to power the electric device.
6. The power switching circuit according to claim 3, further comprising a microcontroller, wherein an input terminal of the microcontroller is electrically connected to the third terminal of the first switching unit and the third terminal of the second switching unit, respectively, an output terminal of the microcontroller is electrically connected to the electrical device, and the microcontroller is configured to receive an electrical signal from the first switching unit or the second switching unit, convert the input electrical signal into an output control signal, and control the electrical device to operate.
7. The power switching circuit according to claim 6, further comprising a third switching unit, wherein the third switching unit comprises a transistor and a fifth resistor, a base of the transistor is electrically connected to the output terminal of the microcontroller, an emitter of the transistor is grounded, two ends of the fifth resistor are electrically connected to a base and a collector of the transistor, respectively, and the collector of the transistor is electrically connected to a power consumer.
8. The power switching circuit of claim 7, wherein the third switching unit further comprises a fourth MOS transistor, a gate terminal of the fourth MOS transistor is electrically connected to the collector of the triode, a source of the fourth MOS transistor is electrically connected to the third terminal of the first switching unit and the third terminal of the second switching unit, and a drain of the fourth MOS transistor is electrically connected to the electrical device.
9. The power switching circuit according to claim 8, wherein the second MOS transistor, the third MOS transistor and the fourth MOS transistor are PMOS transistors, and the first MOS transistor is an NMOS transistor.
10. The power switching circuit according to claim 8, wherein diodes are connected in parallel between the drains and sources of the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022218743.XU CN213402558U (en) | 2020-09-30 | 2020-09-30 | Power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022218743.XU CN213402558U (en) | 2020-09-30 | 2020-09-30 | Power supply switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213402558U true CN213402558U (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022218743.XU Active CN213402558U (en) | 2020-09-30 | 2020-09-30 | Power supply switching circuit |
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| Country | Link |
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| CN (1) | CN213402558U (en) |
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2020
- 2020-09-30 CN CN202022218743.XU patent/CN213402558U/en active Active
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