CN216146093U - Power supply circuit and electronic device - Google Patents
Power supply circuit and electronic device Download PDFInfo
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- CN216146093U CN216146093U CN202121541985.0U CN202121541985U CN216146093U CN 216146093 U CN216146093 U CN 216146093U CN 202121541985 U CN202121541985 U CN 202121541985U CN 216146093 U CN216146093 U CN 216146093U
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Abstract
The disclosure relates to the technical field of electronic equipment, in particular to a power supply circuit and electronic equipment. A power supply circuit, applied to an electronic device, the power supply circuit comprising: the on-off switch comprises an input end, an output end and a control end, wherein the input end is used for being connected with an input power supply, and the output end is connected with an electrical appliance of the electronic equipment; the detection circuit is connected with the control end of the on-off switch and used for detecting the voltage of the input power supply and controlling the on-off of the on-off switch according to the voltage; and the indicating circuit is connected with the detection circuit, and the detection circuit controls the on-off of the indicating circuit according to the voltage. The power supply circuit reduces the risk of burning out the power supply of the electronic equipment and improves the use safety of the equipment.
Description
Technical Field
The disclosure relates to the technical field of electronic equipment, in particular to a power supply circuit and electronic equipment.
Background
With the development of electronic technology, various electronic devices are widely used in daily life of people. The work of electronic equipment needs normal input voltage, and the standard operating voltage of different electronic equipment is also different, and along with the unified development of various electronic equipment power supply interfaces, the power adapter interface of various equipment tends to unanimous for the probability that the user used wrong adapter promotes by a wide margin, leads to that electronic equipment can't normally work, even burns out.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem of electronic equipment failure caused by a non-standard input power supply, the embodiment of the disclosure provides a power supply circuit and electronic equipment with the power supply circuit.
In a first aspect, the present disclosure provides a power supply circuit applied to an electronic device, where the power supply circuit includes:
the on-off switch comprises an input end, an output end and a control end, wherein the input end is used for being connected with an input power supply, and the output end is connected with an electrical appliance of the electronic equipment;
the detection circuit is connected with the control end of the on-off switch and used for detecting the voltage of the input power supply and controlling the on-off of the on-off switch according to the voltage; and
and the indicating circuit is connected with the detecting circuit, and the detecting circuit controls the on-off of the indicating circuit according to the voltage.
In some embodiments, the detection circuit comprises:
one end of the voltage stabilizing circuit is connected with the input end of the on-off switch, and the other end of the voltage stabilizing circuit is grounded; and
and the emitter of the triode is connected with the input end of the on-off switch, the base of the triode is connected with the voltage stabilizing circuit, and the collector of the triode is connected with the control end of the on-off switch.
In some embodiments, the voltage stabilizing circuit comprises a first resistor and a voltage regulator tube which are connected in series, wherein one end of the first resistor is connected with the input end of the on-off switch, and the other end of the first resistor is connected with the voltage regulator tube;
and the emitter and the base of the triode are connected in parallel with two ends of the first resistor.
In some embodiments, the detection circuit further comprises:
and one end of the second resistor is connected with the base electrode of the triode, and the other end of the second resistor is connected between the first resistor and the voltage-regulator tube.
In some embodiments, the on-off switch comprises:
the source electrode and the drain electrode of the MOS tube form the input end and the output end respectively, and the grid electrode of the MOS tube forms the control end; and
and one end of the third resistor is connected with the grid electrode of the MOS tube, and the other end of the third resistor is grounded.
In some embodiments, the MOS transistor is a PMOS transistor.
In some embodiments, the indication circuit includes a fourth resistor and an indication device connected in series, one end of the fourth resistor is connected to the collector of the triode, the other end of the fourth resistor is connected to the indication device, and the indication device is grounded.
In some embodiments, the indicator means comprises an indicator light and/or a buzzer.
In a second aspect, the disclosed embodiments provide an electronic device, including:
the power supply circuit according to any of the embodiments of the first aspect;
the power supply interface is connected with the input end of the on-off switch; and
and the electric device is connected with the output end of the on-off switch.
In some embodiments, the consumer device comprises a device motherboard.
The power supply circuit of the embodiment of the disclosure is applied to electronic equipment and comprises an on-off switch, a detection circuit and an indication circuit, wherein the on-off switch comprises an input end, an output end and a control end, the input end is used for connecting an input power supply, the output end is connected with an electric device of the electronic equipment, the detection circuit is connected with the control end of the on-off switch and used for detecting the voltage of the input power supply and controlling the on-off of the on-off switch according to the voltage, the indication circuit is connected with the detection circuit, and the detection circuit controls the on-off of the indication circuit according to the voltage. The power supply circuit of the embodiment can automatically disconnect the power supply of the electronic equipment when the electronic equipment is connected with an abnormal input power supply, and the indicating circuit can send an alarm to remind a user, so that the risk of burning the equipment is reduced, and the use safety of the equipment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a power supply circuit according to some embodiments of the present disclosure.
Fig. 2 is a circuit schematic of a power supply circuit according to some embodiments of the present disclosure.
Detailed Description
The technical solutions of the present disclosure will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. In addition, technical features involved in different embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.
Electronic devices often need to be connected with power supplies during operation, such as household appliances, computer hosts, server devices and the like. In addition, different electronic devices often have different standard operating voltages, also called rated voltages, and the electronic devices often are provided with a power adapter in a matching manner, so that users can expect to use the matched power adapter to input the standard operating voltages for the electronic devices.
With the unified development of the charger interface, different electronic devices use the same power interface, for example, the type-C interface is popular, and more electronic devices use the type-C interface as the power interface. Because the power interfaces are the same, the probability that the user uses the wrong adapter is greatly improved, for example, the power adapter with high output voltage is adopted to supply power to the electronic equipment with low working voltage, so that the equipment cannot work normally, and even the equipment is burnt in severe cases.
Based on the defects in the related art, the embodiment of the present disclosure provides a power supply circuit and an electronic device, and aims to solve the problem of electronic device failure caused by an excessively high input power source and improve the power supply stability of the device.
In a first aspect, the disclosed embodiments provide a power supply circuit, which can be applied in an electronic device. The electronic device of the embodiments of the present disclosure may be any device type suitable for implementation, such as various large, medium, and small electric appliances, mobile terminals, computers, server devices, and the like, which is not limited in this disclosure. The power supply Circuit of the embodiment of the present disclosure may be disposed on a main Board of the electronic device, for example, the power supply Circuit may be disposed on the main Board through a Printed Circuit Board (PCB).
In some embodiments, a power supply circuit of examples of the present disclosure includes an on-off switch, a detection circuit, and an indication circuit.
The on-off switch comprises an input end, an output end and a control end. The input end is used for connecting an input power supply, for example, in one example, the input end of the on-off switch may be connected with a power supply interface, so that the connection with the input power supply is realized through the plugging and unplugging of the power supply interface and the adapter. The input terminal is connected with an electric device of the electronic equipment, for example, in one example, the electric device can be a device main board of the electronic equipment.
The on-off switch is a switch unit capable of controlling on-off, and the on-off of the input end and the output end is controlled through the control end, so that power supply and power off of the electric device are realized. In some embodiments, the on/off switch may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS fet), which is described in the following embodiments of the present disclosure and will not be described in detail herein.
The detection circuit is connected with the control end of the on-off switch and can detect the voltage of the input power supply, so that the on-off switch is controlled to be switched on or switched off according to the voltage. In some embodiments, the detection circuit can set the voltage stabilizing circuit according to the normal working voltage of the electronic equipment, and when the voltage of the input power supply is in the normal working range, the on-off switch can be controlled to be switched on, so that power supply to the electric device is realized; when the voltage of the input power supply is greater than the normal working voltage, the on-off switch can be controlled to be switched off, and the electric device is prevented from being burnt by input of overhigh voltage and current.
The following embodiments of the present disclosure will be specifically described with respect to the structure and operation principle of the detection circuit, and will not be described in detail here.
In the embodiment of the disclosure, the power supply circuit further comprises an indication circuit, and the indication circuit is connected with the detection circuit, so that when the detection circuit controls the on-off switch to be switched on and off according to the voltage of the input voltage, the detection circuit can also control the on-off of the indication circuit according to the voltage.
In some embodiments, the indication circuitry refers to the relevant circuitry structure for prompting the user. For example, the indication circuit may include an indicator light; for another example, the indication circuit may include a buzzer; for another example, the indicator circuit may include both an indicator light and a buzzer. When the detection circuit detects that the voltage of the input power supply is too high, the indication circuit can be controlled to be conducted, sound/light alarm is realized, a user is reminded to intervene treatment, and electronic equipment is prevented from being burnt.
According to the power supply circuit, the detection circuit is used for controlling the on-off switch and the indicating circuit, when the electronic equipment is connected to an abnormal input power supply, the electronic equipment can be automatically switched off to supply power, the indicating circuit can send out an alarm to remind a user, the risk of burning the equipment is reduced, and the use safety of the equipment is improved.
Fig. 1 shows a block diagram of an electronic device according to some embodiments of the present disclosure, and a power supply circuit according to an embodiment of the present disclosure is described below with reference to fig. 1.
As shown in FIG. 1, electronic device 100 may be any type of device, such as a computing power box, a server, or other small computing device. The electronic device 100 is provided with a power interface 110, and the power interface 110 is used for being plugged in a power adapter, so that an external power supply can be accessed to supply power to the electronic device 100.
In some embodiments, the power interface 110 may be any type of power supply interface, such as a USB (Universal Serial Bus) interface, a type-C interface, and the like, which is not limited by the present disclosure.
The powered device 120 is an electronic component of the electronic apparatus 100, and when powered, can implement a corresponding circuit function. For example, the powered device 120 may be a motherboard of the electronic device 100, so that the device is powered on after power is supplied to the motherboard. For another example, the electrical device 120 may be a mechanical element of the electronic device 100, so that the mechanical element is activated after power is supplied to the mechanical element. Powered device 120 may be any type of powered device and is not intended to be exhaustive by the present disclosure.
It is understood that in the prior art, the power interface 110 of the electronic device 100 is often directly connected to the electrical device 120, so that the electrical device can be powered after the external power is input to the power interface 110. However, in case that the user uses the wrong power adapter, the voltage of the input power of the power interface 110 is much higher than the normal operating voltage of the electric device 120, and the excessive input voltage generates a large current, thereby causing the burning of the electric device 120.
In the embodiment of the present disclosure, an on-off switch 200 is disposed on a connection circuit between the power interface 110 and the electrical device 120, and power supply and power cut-off of the electrical device 120 are realized through the on-off switch 200. The on-off switch 200 may be, for example, a MOS transistor.
The detection circuit 300 can detect the voltage of the input power, and when the voltage of the input power is abnormal, the detection circuit 300 can control the on-off switch 200 to be switched off, so that the electric device 120 is powered off, and the indication circuit 400 is controlled to be switched on. For example, the rated operating voltage of the electronic device is 12V, when a user accidentally connects a 30V power adapter, the detection circuit 300 can detect that the voltage of the input power supply is 30V greater than the rated operating voltage 12V, so as to control the on-off switch 200 to be turned off, the electrical appliance 120 to be powered off and unable to be started, and control the indication circuit 400 to operate. Since the powered device 120 is in the power-off state, the powered device 120 is prevented from being burned out, and the indicating circuit 400 can prompt the user that the current input power is abnormal and the correct power adapter needs to be replaced.
Fig. 2 shows a specific circuit structure of a power supply circuit in some embodiments of the present disclosure, and the power supply circuit of the present disclosure is described below with reference to fig. 2.
As shown in fig. 2, in some embodiments, the on-off switch 200 includes a MOS transistor 210, and the MOS transistor 210 includes three electrodes: grid G, source S and drain electrode D, MOS pipe' S basic operating principle does: the level signal passing through the gate G controls the source S and the drain D to be turned on or off. In the embodiment of the present disclosure, the source S of the MOS transistor 210 is connected to the power interface 110, and the drain D is connected to the electric device.
In some embodiments, the MOS transistor 210 of the disclosed example employs a P-type MOS transistor, i.e., a PMOS transistor. It can be understood that the MOS transistor can be divided into a PMOS transistor and an NMOS transistor, and for the PMOS transistor, when the voltage V between the gate G and the source S isgsIf the threshold is greater than the threshold, the MOS transistor 210 is turned off.
The on-off switch 200 further includes a third resistor R3, wherein one end of the third resistor R3 is connected to the gate G of the MOS transistor 210, and the other end is grounded, so as to provide voltage variation for the gate G of the MOS transistor 210.
The detection circuit 300 includes a regulator circuit including a first resistor R1 and a voltage regulator 310, and a transistor 320. The regulator tube 310 may be a zener diode whose basic principle of operation is to allow a particular voltage to pass through the regulator tube 310. Therefore, in the embodiment of the present disclosure, the voltage regulator 310 may be selected according to a standard operating voltage of the electronic device, for example, if the standard operating voltage of the electronic device is 12V, the voltage regulator 310 of 12V is selected.
One end of the first resistor R1 is connected to the source S of the MOS transistor 210, the other end is connected to the regulator 310, and the regulator 310 is grounded.
The detection circuit 300 further includes a second resistor R2, and the second resistor R2 and the transistor 320 are connected in series and then connected in parallel with the first resistor R1. Specifically, one end of the second resistor R2 is connected to the base b of the transistor 320, and the other end is connected between the first resistor R1 and the regulator 310. The emitter e of the transistor 320 is connected to the source S of the MOS transistor 210, and the collector c of the transistor 320 is connected to the gate G of the MOS transistor 210.
The indicating circuit 400 comprises a fourth resistor R4 and an indicating device 410 connected in series, wherein one end of the fourth resistor R4 is connected to the collector C of the transistor 320, the other end is connected to the indicating device 410, and the indicating device 410 is grounded.
In some embodiments, the indicator device 410 may be an indicator light, such as an LED indicator light or the like. In other embodiments, the indication device 410 may be a buzzer. In still other embodiments, the indicator device 410 may also include both an indicator light and a buzzer. This can be understood and fully implemented by those skilled in the art, and the present disclosure will not be described in detail.
In some embodiments, the transistor 320 may be a PNP transistor, and the conducting voltage V between the base b and the emitter e thereofbeIt was 0.7V. That is, when VbeWhen the voltage is greater than or equal to 0.7V, the triode 320 is conducted and works, and when V is greater than or equal to 0.7VbeWhen the voltage is less than 0.7V, the transistor 320 does not work.
The structure of the power supply circuit in some embodiments of the present disclosure is described above, and the operation principle of the power supply circuit is described below with reference to fig. 2.
In some embodiments, assuming that the normal operating voltage of the electrical device 120 in the circuit shown in fig. 2 is 12V, i.e., the operating voltage of the regulator 310 is 12V, the turn-on voltage V of the transistor 320 is 12VbeIt was 0.7V.
When the user uses the power adapter with standard working voltage, the voltage of the input power of the power interface 110 is 12V, and the voltage at the two ends of the voltage regulator tube 310 is 12V, so the V of the triode 320 is 12VbeThe voltage is much less than 0.7V, so the transistor 320 is not conductive, i.e., VecWhen the voltage of the power supply is equal to 0, the gate G of the MOS transistor 210 is at a low level, the MOS transistor 210 is turned on, the input power supply continuously supplies power to the electrical device 120, and the electronic device is normally started. Meanwhile, since the transistor 320 is not turned on, the voltage across the indicating device 410 is 0, and the indicating device 410 does not operate.
When the user uses the power adapter with the working voltage higher than the standard voltage, the voltage of the power input by the power interface 110 is higher than 12V, and the voltage at the two ends of the voltage regulator tube 310 is 12V, so the V of the triode 320 is larger than 12VbeIs raised when VbeThe transistor 320 is turned on when it is greater than 0.7V, therebyThe gate G of the MOS transistor 210 is pulled high, the source S and the drain D of the MOS transistor 210 are disconnected, the input power supply cannot supply power to the electrical device 120, and the electronic device cannot start up. Meanwhile, since the transistor 320 is turned on, the voltage across the indicating device 410 increases, and the indicating device 410 operates.
According to the power supply circuit, the detection circuit is used for controlling the on-off switch and the indicating circuit, when the electronic equipment is connected to an abnormal input power supply, the electronic equipment can be automatically switched off to supply power, the indicating circuit can send out an alarm to remind a user, the risk of burning the equipment is reduced, and the use safety of the equipment is improved.
In addition, in the embodiment of the disclosure, the power supply protection is realized by adopting the MOS transistor and the triode, and compared with a power supply protection circuit in the prior art, the power supply protection circuit has a simpler structure and lower realization cost, and is favorable for the arrangement of miniaturized equipment focusing on the landing cost.
In a second aspect, the disclosed embodiments provide an electronic device that may be any type of device, such as a computing power box, a server, or other small computing device. The electronic equipment is provided with a power supply interface, and the power supply interface is used for being plugged with a power supply adapter so as to be connected with an external power supply and realize power supply for electrical appliances of the electronic equipment.
In one example, the power interface of the electronic device is a USB interface, and the powered device is a device motherboard of the electronic device.
Specifically, the structure and the operation principle of the electronic device of the present disclosure may be obtained by referring to the embodiments shown in fig. 1 and fig. 2, which are not described again in this disclosure.
According to the electronic equipment, the detection circuit is used for controlling the on-off switch and the indicating circuit, when the electronic equipment is connected to an abnormal input power supply, the electronic equipment can be automatically switched off, the indicating circuit can send out an alarm to remind a user, the risk of burning the equipment is reduced, and the use safety of the equipment is improved. In addition, in the embodiment of the disclosure, the power supply protection is realized by adopting the MOS transistor and the triode, and compared with a power supply protection circuit in the prior art, the power supply protection circuit has a simpler structure and lower realization cost, and is favorable for the arrangement of miniaturized equipment focusing on the landing cost.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the present disclosure may be made without departing from the scope of the present disclosure.
Claims (9)
1. A power supply circuit, applied to an electronic device, the power supply circuit comprising:
the on-off switch comprises an input end, an output end and a control end, wherein the input end is used for being connected with an input power supply, and the output end is connected with an electrical appliance of the electronic equipment;
the detection circuit is connected with the control end of the on-off switch and used for detecting the voltage of the input power supply and controlling the on-off of the on-off switch according to the voltage; and
the indicating circuit is connected with the detecting circuit, and the detecting circuit controls the on-off of the indicating circuit according to the voltage;
the on-off switch includes:
the source electrode and the drain electrode of the MOS tube form the input end and the output end respectively, and the grid electrode of the MOS tube forms the control end; and
and one end of the third resistor is connected with the grid electrode of the MOS tube, and the other end of the third resistor is grounded.
2. The power supply circuit of claim 1, wherein the detection circuit comprises:
one end of the voltage stabilizing circuit is connected with the input end of the on-off switch, and the other end of the voltage stabilizing circuit is grounded; and
and the emitter of the triode is connected with the input end of the on-off switch, the base of the triode is connected with the voltage stabilizing circuit, and the collector of the triode is connected with the control end of the on-off switch.
3. The power supply circuit of claim 2,
the voltage stabilizing circuit comprises a first resistor and a voltage stabilizing tube which are connected in series, wherein one end of the first resistor is connected with the input end of the on-off switch, and the other end of the first resistor is connected with the voltage stabilizing tube;
and the emitter and the base of the triode are connected in parallel with two ends of the first resistor.
4. The power supply circuit of claim 3, wherein the detection circuit further comprises:
and one end of the second resistor is connected with the base electrode of the triode, and the other end of the second resistor is connected between the first resistor and the voltage-regulator tube.
5. The power supply circuit of claim 1,
the MOS tube is a PMOS tube.
6. The power supply circuit of claim 2,
the indicating circuit comprises a fourth resistor and an indicating device which are connected in series, one end of the fourth resistor is connected with the collector of the triode, the other end of the fourth resistor is connected with the indicating device, and the indicating device is grounded.
7. The power supply circuit of claim 6,
the indicating device comprises an indicating lamp and/or a buzzer.
8. An electronic device, comprising:
a power supply circuit according to any one of claims 1 to 7;
the power supply interface is connected with the input end of the on-off switch; and
and the electric device is connected with the output end of the on-off switch.
9. The electronic device of claim 8,
the electrical appliance comprises an equipment main board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121541985.0U CN216146093U (en) | 2021-07-07 | 2021-07-07 | Power supply circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121541985.0U CN216146093U (en) | 2021-07-07 | 2021-07-07 | Power supply circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216146093U true CN216146093U (en) | 2022-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121541985.0U Active CN216146093U (en) | 2021-07-07 | 2021-07-07 | Power supply circuit and electronic device |
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| Country | Link |
|---|---|
| CN (1) | CN216146093U (en) |
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2021
- 2021-07-07 CN CN202121541985.0U patent/CN216146093U/en active Active
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