CN210468890U - Power supply switching circuit - Google Patents
Power supply switching circuit Download PDFInfo
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- CN210468890U CN210468890U CN201921541578.2U CN201921541578U CN210468890U CN 210468890 U CN210468890 U CN 210468890U CN 201921541578 U CN201921541578 U CN 201921541578U CN 210468890 U CN210468890 U CN 210468890U
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Abstract
The utility model discloses a power supply switching circuit, which comprises a first channel control circuit and a second channel control circuit; the first channel control circuit comprises a first input power supply, a first input end, two switching devices and a first output end, and the second channel control circuit comprises a second input power supply, a second input end, two switching devices, a fifth switching device and a second output end; the first input power supply inputs voltage to the first channel control circuit from the first input end and controls the output voltage of the first output end by controlling the conducting states of the two switching devices; the second input power supply inputs voltage to the second channel control circuit from the second input end, and the first input power supply controls the conduction states of the two switching devices through the output voltage of the fifth switching device, so that the output voltage of the second output end is controlled. The utility model has the advantages of high efficiency, less heat generation, simple structure, less components and parts, low cost and high power switching speed.
Description
Technical Field
The utility model relates to an integrated circuit field especially relates to a power supply switching circuit.
Background
At present, in many control systems, a double-path or multi-path power supply is adopted for supplying power, for example, a control panel in a public security mobile investigation monitoring system adopts the multi-path power supply for redundancy backup, and the design relates to the problem of how to realize automatic switching of the multi-path power supply. Therefore, in the common prior art, a dedicated integrated circuit is added in the circuit design to solve the problem of automatic power switching, but the design often causes the problems of complicated circuit design, more related components and high cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides an automatic power switching circuit aiming at the defects in the prior art, which comprises a first channel control circuit, a second channel control circuit, a first input power supply and a second input power supply, wherein the first input power supply is simultaneously connected with the first channel control circuit and the second channel control circuit, and the second input power supply is connected with the second channel control circuit;
the first channel control circuit comprises a first input end and a first output end, and the second channel control circuit comprises a second input end and a second output end;
when the second input power supply is started and voltage is input to the second channel control circuit from the second input end, and the first input power supply is not started, the second output end outputs voltage, and the first output end does not output voltage;
when the second input power supply is turned on and inputs voltage to the second channel control circuit, the first input power supply is also turned on, the second channel control circuit turns off the voltage output of the second output end, the first input power supply inputs voltage to the first channel control circuit from the first input end, the first output end outputs voltage, and the power supply switching circuit realizes switching from the voltage output of the second output end to the voltage output of the first output end.
Optionally, the first channel control circuit comprises a first switching device and a second switching device, each of the first switching device and the second switching device comprises a first terminal, a second terminal and a third terminal; a common connecting end generated by electrically connecting the third end of the first switching device with the first end of the second switching device is electrically connected with the first input end; the first end of the first switching device is electrically connected with the third end of the second switching device; the second end of the first switch device is electrically connected with the first output end; a second terminal of the second switching device is grounded;
when the first input power supply inputs a voltage from the first input terminal to the first channel control circuit, the first input power supply controls the first output terminal to output the voltage through the first switching device and the second switching device.
Optionally, the second channel control circuit comprises a third switching device and a fourth switching device, and the third switching device and the fourth switching device each comprise a first terminal, a second terminal, and a third terminal; a common connecting end generated by electrically connecting the third end of the third switching device with the first end of the fourth switching device is electrically connected with the second input end; the first end of the third switching device is electrically connected with the third end of the fourth switching device; the second end of the third switching device is electrically connected with the second output end; a second terminal of the fourth switching device is grounded;
the second channel control circuit further comprises a fifth switching device, a third end of the fifth switching device is electrically connected with a first end of the fourth switching device, and a second end of the fifth switching device is grounded;
when the second input power supply inputs voltage to the second channel control circuit from the second input end, the first input power supply is electrically connected with the first end of the fifth switching device, and the third end output voltage of the fifth switching device controls the second output end output voltage through the third switching device and the fourth switching device.
Optionally, the first channel control circuit further includes a first protection circuit, the first protection circuit including a first resistor and a first capacitor, the first resistor and the first capacitor being coupled in parallel between a first terminal and a second terminal of the first switching device;
the second channel control circuit further comprises a second protection circuit, wherein the second protection circuit comprises a fourth resistor and a second capacitor, and the fourth resistor and the second capacitor are coupled between the first end and the second end of the third switching device in parallel.
Optionally, the first channel control circuit further includes a second resistor, the second resistor is coupled between the first end of the first switch device and the third end of the second switch device, and a common connection end of the second resistor and the first end of the first switch device is electrically connected to the first protection circuit;
the second channel control circuit further comprises a fourth resistor, the fourth resistor is coupled between the first end of the third switching device and the third end of the fourth switching device, and the common connection end of the fourth resistor and the first end of the third switching device is electrically connected with the first protection circuit.
Optionally, the first channel control circuit further comprises a third resistor coupled between the third terminal of the first switching device and the first terminal of the second switching device; a common connection end of the third resistor and the third end of the first switching device is electrically connected with the first input end;
the second channel control circuit further comprises a sixth resistor coupled between the third terminal of the third switching device and the first terminal of the second switching device; and the common connection end of the sixth resistor and the third end of the third switching device is electrically connected with the second input end.
Optionally, the first channel control circuit further includes a seventh resistor, and a common connection end of the first end of the second switching device and the third resistor is electrically connected to one end of the seventh resistor;
the other end of the seventh resistor is grounded.
Optionally, the second channel control circuit further includes a fifth switching device, and a common connection end of a first end of the fourth switching device and the sixth resistor is electrically connected to a third end of the fifth switching device;
the first end of the fifth switching device is connected with the first input power supply.
Optionally, the first switching device and the third switching device each include a first P-channel MOSFET transistor and a diode, the diode is coupled between a drain and a source of the first P-channel MOSFET transistor, and a conduction direction of the diode is from a drain direction to a source direction;
the second switch device, the fourth switch device and the fifth switch device each include a first N-channel MOSFET transistor and a diode, the diode is coupled between the drain and the source of the first P-channel MOSFET transistor, and the conduction direction of the diode is from the source direction to the drain direction.
The utility model adopts the circuit device which is designed by combining the MOS tube and the diode to replace a switch device which determines whether the circuit is conducted or not, and adopts the design of double MOS tubes in a channel control circuit, thereby having the advantages of high efficiency and less heat generation; and simultaneously the utility model discloses simple structure, components and parts are few, make the utility model discloses a with low costs, power switching speed is fast, can be applicable to the circuit in more fields.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic circuit diagram of a first channel control circuit according to the present invention;
fig. 2 is a schematic diagram of a circuit structure of the second channel control circuit of the present invention.
Wherein 11-the first input, 12-the first output, 21-the second input, 22-the second output.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
The utility model discloses a power supply switching circuit, figure 1 and figure 2 are the utility model discloses a circuit design schematic diagram, wherein, figure 1 is first channel control circuit, and figure 2 is second channel control circuit, and first channel control circuit includes first input 11 and first output 12, and second channel control circuit includes second input 21 and second output 22. The first input terminal 11 is connected to the first input power VIN1, and the second input terminal 21 is connected to the second input power VIN 2. The specific circuit structure is described below.
The first channel control circuit shown in fig. 1 has the following structure:
as shown in fig. 1, the first channel control circuit includes a first switching device and a second switching device, and the first switching device and the second switching device each include a first terminal, a second terminal, and a third terminal. In this embodiment, the first switching device and the second switching device are both soft start circuits (soft start) formed by electrically connecting MOS transistors and diodes. The first switch device is composed of a first P-channel MOSFET Q1 and a diode, the diode is coupled between the drain and the source of the first P-channel MOSFET Q1, and the conduction direction of the diode is from the drain direction to the source direction; the second switch device is composed of a first N-channel MOSFET Q2 and a diode, the diode is coupled between the drain and the source of the first N-channel MOSFET Q2, and the conduction direction of the diode is from the source direction to the drain direction. In this embodiment, the first terminal of the first switching device is the gate of the first P-channel MOSFET Q1, the second terminal is the source of the first P-channel MOSFET Q1, and the third terminal is the drain of the first P-channel MOSFET Q1. The first terminal of the second switch device is the gate of the first N-channel MOSFET Q2, the second terminal is the source of the first N-channel MOSFET Q2, and the third terminal is the drain of the first N-channel MOSFET Q2. In the description of the embodiments that follow, the three terminals of the switching device are described as gate, drain and source for ease of review.
In the first channel control circuit shown in fig. 1, the first input terminal 11 is electrically connected to the drain of the first P-channel MOSFET Q1, and the first input terminal 11 is also electrically connected to the gate of the first N-channel MOSFET Q2. A third resistor R3 is coupled between the drain of the first P-channel MOSFET Q1 and the gate of the first N-channel MOSFET Q2. Therefore, the first input terminal 11 is coupled to the common connection terminal of the drain of the first P-channel MOSFET Q1 and the third resistor R3; the common connection end of the gate of the first N-channel MOSFET Q2 and the third resistor R3 is coupled to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is grounded. In addition, the gate of the first P-channel MOSFET Q1 is electrically connected to the drain of the first N-channel MOSFET Q2, a second resistor R2 is coupled between the gate of the first P-channel MOSFET Q1 and the drain of the first N-channel MOSFET Q2, and the source of the first N-channel MOSFET Q2 is grounded.
The first channel control circuit further comprises a first protection circuit, the first protection circuit comprises a first resistor R1 and a first capacitor C1, the first resistor R1 and the first capacitor C1 are coupled in parallel between the gate and the source of the first P-channel MOSFET Q1, that is, a parallel common connection end of the first resistor R1 and the first capacitor C1 is connected to a common connection end between the second resistor R2 and the gate of the first P-channel MOSFET Q1, and the other common connection end of the first resistor R1 and the first capacitor C1 is connected to the source of the first P-channel MOSFET Q1. The source of the first P-channel MOSFET Q1 is coupled to the first output terminal 12.
In addition, the drain of the first P-channel MOSFET Q1 has 4 pins, as shown in fig. 1, the 5, 6, 7 and 8 pins are connected in parallel, and one common connection terminal of the 5, 6, 7 and 8 pins is coupled to the first input terminal 11, and the other common connection terminal is coupled to the drain of the first P-channel MOSFET Q1. The source of the first P-channel MOSFET Q1 has 3 pins, which are 1, 2, and 3 pins, and the 1, 2, and 3 pins are connected in parallel, and one common connection terminal of the first P-channel MOSFET Q1 is coupled to the source of the first P-channel MOSFET Q1, and the other common connection terminal is coupled to the first output terminal 12, and the gate of the first P-channel MOSFET Q1 is pin No. 4. Specifically, in this embodiment, as shown in fig. 1, the first capacitor C1 and the first resistor R1 are connected in parallel in such a manner that the first resistor R1 is close to the source of the first P-channel MOSFET Q1, so that the common connection terminal of the first resistor R1 and the source of the first P-channel MOSFET Q1 is coupled to the other common connection terminal of pins 1, 2 and 3. In other embodiments, the connection position relationship of the present embodiment is not limited, and it is sufficient that the pins 1, 2 and 3 are coupled in parallel between the common connection end of the first capacitor C1 and the first resistor R1 and the source of the first P-channel MOSFET Q1. Here, the purpose of using parallel pins is to achieve a large current flow.
The second channel control circuit shown in fig. 2 has the following structure:
similarly to the structure of the first channel control circuit, the second channel control circuit also includes two switching devices, namely a third switching device and a fourth switching device, the two switching devices also have a first end, a second end and a third end, and the two switching devices are both soft start circuits (soft start) formed by MOS transistors and diodes. Specifically, the third switching device is composed of a second P-channel MOSFET Q3 and a diode, the diode is coupled between the drain and the source of the second P-channel MOSFET Q3, and the conduction direction of the diode is from the drain to the source; the fourth switching device is composed of a second N-channel MOSFET Q4 and a diode, the diode is coupled between the drain and the source of the second N-channel MOSFET Q4, and the conduction direction of the diode is from the source to the drain. In this embodiment, the first terminal of the third switching device is the gate of the second P-channel MOSFET Q3, the second terminal is the source of the second P-channel MOSFET Q3, and the third terminal is the drain of the second P-channel MOSFET Q3. The first terminal of the fourth switching device is the gate of the second N-channel MOSFET Q4, the second terminal is the source of the second N-channel MOSFET Q4, and the third terminal is the drain of the second N-channel MOSFET Q4. The gate, source and drain are used for ease of discrimination in the following description.
In fig. 2, the second input terminal 21 is electrically connected to the drain of the second P-channel MOSFET Q3, and the second input terminal 21 is also electrically connected to the gate of the second N-channel MOSFET Q4. A sixth resistor R6 is coupled between the drain of the second P-channel MOSFET Q3 and the gate of the second N-channel MOSFET Q4. Therefore, the second input terminal 21 is coupled to the common connection terminal of the drain of the second P-channel MOSFET Q3 and the sixth resistor R6. The circuit further includes a fifth switching device comprising a third N-channel MOSFET Q5 and a diode coupled between the drain and source of the third N-channel MOSFET Q5, the diode being turned on with the source pointing to the drain. The common connection terminal of the gate of the second N-channel MOSFET Q4 and the sixth resistor R6 is coupled to the drain of the third N-channel MOSFET Q5, and the source of the third N-channel MOSFET Q5 is grounded. In addition, the gate of the second P-channel MOSFET Q3 is electrically connected to the drain of the second N-channel MOSFET Q4, a fifth resistor R5 is coupled between the gate of the second P-channel MOSFET Q3 and the drain of the second N-channel MOSFET Q4, and the source of the second N-channel MOSFET Q4 is grounded.
The second channel control circuit further comprises a second protection circuit, the second protection circuit comprises a fourth resistor R4 and a second capacitor C2, the fourth resistor R4 and the second capacitor C2 are coupled in parallel between the gate and the source of the second P-channel MOSFET Q3, that is, a parallel common connection end of the fourth resistor R4 and the second capacitor C2 is connected to a common connection end between the gate of the fifth resistor R5 and the second P-channel MOSFET Q3, and the other common connection end of the fourth resistor R4 and the second capacitor C2 is connected to the source of the second P-channel MOSFET Q3. The source of the second P-channel MOSFET Q3 is coupled to the second output terminal 22.
Similar to the first channel control circuit, the drain of the second P-channel MOSFET Q3 also has 4 parallel pins, and the source has 3 parallel pins, and the detailed positional relationship and function thereof are not described herein.
The specific operation of this embodiment is as follows:
the first channel control circuit shown in fig. 1 has a first input terminal 11 and a first output terminal 12, the second channel control circuit shown in fig. 2 has a second input terminal 21 and a second output terminal 22, and the gate of the third N-channel MOSFET Q5 in fig. 2 also serves as a power supply input terminal. Specifically, the power switching circuit of the embodiment includes a first input power source VIN1 and a second input power source VIN2, the second input power source VIN2 is coupled to the second input terminal 21, the first input power source VIN1 is coupled to the first input terminal 11, and the first input power source VIN1 is further coupled to the gate of the third N-channel MOSFET Q5.
When the second input power VIN2 is inputted to the second channel control circuit from the second input terminal 21, the first input power VIN1 is not turned on, and the gate of the second N-channel MOSFET Q4 is at a high level, so that the second N-channel MOSFET Q4 is turned on; meanwhile, the drain of the second N-channel MOSFET Q4 outputs a low level; since the drain of the second N-channel MOSFET Q4 is connected to the gate of the second P-channel MOSFET Q3 with the fifth resistor R5 interposed therebetween, the gate of the second P-channel MOSFET Q3 is set to low, and the drain and source of the second P-channel MOSFET Q3 are turned on; therefore, the voltage inputted from the second input terminal 21 by the second input power VIN2 passes through the conducting second P-channel MOSFET Q3 and is finally outputted from the second output terminal 22 to obtain the second output voltage VOUT.
When the second input power VIN2 inputs power to the second channel control circuit, the first input power VIN1 is also turned on, since the first input power VIN1 is also electrically connected to the gate of the third N-channel MOSFET Q5, the gate of the third N-channel MOSFET Q5 is set to high level by the first input power VIN1, so the third N-channel MOSFET Q5 is turned on, and the drain of the third N-channel MOSFET Q5 outputs low level; since the gate of the second N-channel MOSFET Q4 is electrically connected to the drain of the third N-channel MOSFET Q5, the gate of the second N-channel MOSFET Q4 is set low, which turns off the second N-channel MOSFET Q4, and therefore the drain of the second N-channel MOSFET Q4 outputs high, which also turns on the gate of the second P-channel MOSFET Q3, which turns off the second P-channel MOSFET Q3; at this time, even if the second input power VIN2 is input from the second input terminal 21, the second output terminal 22 does not output the second output voltage VOUT 2.
Meanwhile, since the first input power VIN1 is also connected to the first input terminal 11 of the first channel control circuit, the first input power VIN1 is input to the first channel control circuit at the same time as the first input power VIN1 is turned on. At this time, the gate of the first N-channel MOSFET Q2 is set to high level, so that the first N-channel MOSFET Q2 is turned on, and therefore the drain of the first N-channel MOSFET Q2 outputs low level, and therefore the gate of the first P-channel MOSFET Q1 is set to low level, and the first P-channel MOSFET Q1 is turned on; therefore, the voltage of the first input power VIN1 inputted from the first input terminal 11 is outputted from the first output terminal 12 via the first P-channel MOSFET Q1, and the first output voltage VOUT1 is obtained.
In summary, the present embodiment has the following four operation states: when the first input power VIN1 is turned on and the second input power VIN2 is turned off, the output voltage is the first output voltage VOUT1 controlled by the first input power VIN 1; when the first input power VIN1 is turned off and the second input power VIN2 is turned on, the output voltage is a second output voltage VOUT2 controlled by the second input power VIN 2; when the first input power VIN1 is turned on and the second input power VIN2 is also turned on, the output voltage is the first output voltage VOUT1 controlled by the first input power VIN 1; when the second input power VIN2 is turned on for normal operation, and the first input power VIN1 is turned on again, the output voltage of the circuit is switched from the second output voltage VOUT2 to an output voltage VOUT 1.
In practical applications, for example, in the applications of the related devices of the monitoring system for public security mobile investigation, the voltage of the first input power VIN1 is set to be greater than that of the second input power VIN2, and when both input power supplies are turned on, the purpose of preferentially selecting the first input power VIN1 is achieved in this embodiment; under the condition that the second input power VIN2 is originally adopted, the first input power VIN1 is turned on, and the output voltage is immediately switched from the second output voltage VOUT2 to the first output voltage VOUT1, so that the purpose of switching the circuit input power controlled by pure hardware from the second input power VIN2 to the first input power VIN1 can be realized.
In the present embodiment, a switching device (soft start circuit) formed by electrically connecting a MOS transistor and a diode is used to control whether a power supply is turned on or not, and through the circuit design of the first channel control circuit and the second channel control circuit in the present embodiment, when the first input power supply VIN1 is turned on, the first channel control circuit successfully outputs the first output voltage VOUT1, and simultaneously blocks the second channel control circuit from outputting the second output voltage VOUT 2; when the first input power VIN1 is turned off and the second input power VIN2 is turned on, the first channel control circuit does not output the first output voltage VOUT1, but the second channel control circuit outputs the second output voltage VOUT 2. The embodiment finally realizes the automatic switching of the two power supplies. Compared with the prior art, the design of the single MOS combined diode circuit in the prior art has the disadvantages of large power loss and low efficiency, and the design of the embodiment adopts the combined design of the double MOS tubes and the diode to control whether the input power supply outputs voltage from the output end or not, so that the single MOS combined diode circuit has the advantages of high efficiency and less heat generation; other prior art have with high costs characteristics if adopt application specific integrated circuit to realize the power switching, and have some complicated circuit design also to make power switching speed slower, compare in these designs, the design of this embodiment has simple structure, the advantage that components and parts are few for this embodiment circuit design has with low costs, the fast advantage of switching speed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.
Claims (9)
1. A power switching circuit, comprising:
the power supply switching circuit comprises a first channel control circuit, a second channel control circuit, a first input power supply and a second input power supply, wherein the first input power supply is simultaneously accessed to the first channel control circuit and the second channel control circuit, and the second input power supply is accessed to the second channel control circuit;
the first channel control circuit comprises a first input end and a first output end, and the second channel control circuit comprises a second input end and a second output end;
when the second input power supply is started and voltage is input to the second channel control circuit from the second input end, and the first input power supply is not started, the second output end outputs voltage, and the first output end does not output voltage;
when the second input power supply is turned on and inputs voltage to the second channel control circuit, the first input power supply is also turned on, the second channel control circuit turns off the voltage output of the second output end, the first input power supply inputs voltage to the first channel control circuit from the first input end, the first output end outputs voltage, and the power supply switching circuit realizes switching from the voltage output of the second output end to the voltage output of the first output end.
2. The power switching circuit of claim 1, wherein:
the first channel control circuit comprises a first switching device and a second switching device, wherein the first switching device and the second switching device respectively comprise a first end, a second end and a third end; a common connecting end generated by electrically connecting the third end of the first switching device with the first end of the second switching device is electrically connected with the first input end; the first end of the first switching device is electrically connected with the third end of the second switching device; the second end of the first switch device is electrically connected with the first output end; a second terminal of the second switching device is grounded;
when the first input power supply inputs a voltage from the first input terminal to the first channel control circuit, the first input power supply controls the first output terminal to output the voltage through the first switching device and the second switching device.
3. The power switching circuit of claim 2, wherein:
the second channel control circuit comprises a third switching device and a fourth switching device, wherein the third switching device and the fourth switching device respectively comprise a first end, a second end and a third end; a common connecting end generated by electrically connecting the third end of the third switching device with the first end of the fourth switching device is electrically connected with the second input end; the first end of the third switching device is electrically connected with the third end of the fourth switching device; the second end of the third switching device is electrically connected with the second output end; a second terminal of the fourth switching device is grounded;
the second channel control circuit further comprises a fifth switching device, a third end of the fifth switching device is electrically connected with a first end of the fourth switching device, and a second end of the fifth switching device is grounded;
when the second input power supply inputs voltage to the second channel control circuit from the second input end, the first input power supply is electrically connected with the first end of the fifth switching device, and the third end output voltage of the fifth switching device controls the second output end output voltage through the third switching device and the fourth switching device.
4. The power switching circuit of claim 3, wherein:
the first channel control circuit further comprises a first protection circuit, wherein the first protection circuit comprises a first resistor and a first capacitor, and the first resistor and the first capacitor are coupled between the first end and the second end of the first switching device in parallel;
the second channel control circuit further comprises a second protection circuit, wherein the second protection circuit comprises a fourth resistor and a second capacitor, and the fourth resistor and the second capacitor are coupled between the first end and the second end of the third switching device in parallel.
5. The power switching circuit of claim 4, wherein:
the first channel control circuit further comprises a second resistor, the second resistor is coupled between the first end of the first switching device and the third end of the second switching device, and a common connection end of the second resistor and the first end of the first switching device is electrically connected with the first protection circuit;
the second channel control circuit further comprises a fourth resistor, the fourth resistor is coupled between the first end of the third switching device and the third end of the fourth switching device, and the common connection end of the fourth resistor and the first end of the third switching device is electrically connected with the first protection circuit.
6. The power switching circuit of claim 5, wherein:
the first channel control circuit further comprises a third resistor coupled between a third terminal of the first switching device and a first terminal of the second switching device; a common connection end of the third resistor and the third end of the first switching device is electrically connected with the first input end;
the second channel control circuit further comprises a sixth resistor coupled between the third terminal of the third switching device and the first terminal of the second switching device; and the common connection end of the sixth resistor and the third end of the third switching device is electrically connected with the second input end.
7. The power switching circuit of claim 6, wherein:
the first channel control circuit further comprises a seventh resistor, and a common connection end of the first end of the second switching device and the third resistor is electrically connected with one end of the seventh resistor;
the other end of the seventh resistor is grounded.
8. The power switching circuit of claim 7, wherein:
the second channel control circuit further comprises a fifth switching device, and a common connection end of a first end of the fourth switching device and the sixth resistor is electrically connected with a third end of the fifth switching device;
the first end of the fifth switching device is connected with the first input power supply.
9. The power switching circuit according to any one of claims 3 to 8, wherein:
the first switching device and the third switching device respectively comprise a first P-channel MOSFET tube and a diode, the diode is coupled between the drain electrode and the source electrode of the first P-channel MOSFET tube, and the conduction direction of the diode is from the direction of the drain electrode to the direction of the source electrode;
the second switch device, the fourth switch device and the fifth switch device each include a first N-channel MOSFET transistor and a diode, the diode is coupled between the drain and the source of the first P-channel MOSFET transistor, and the conduction direction of the diode is from the source direction to the drain direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921541578.2U CN210468890U (en) | 2019-09-17 | 2019-09-17 | Power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921541578.2U CN210468890U (en) | 2019-09-17 | 2019-09-17 | Power supply switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210468890U true CN210468890U (en) | 2020-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921541578.2U Active CN210468890U (en) | 2019-09-17 | 2019-09-17 | Power supply switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210468890U (en) |
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2019
- 2019-09-17 CN CN201921541578.2U patent/CN210468890U/en active Active
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