Power supply protection circuit and electronic equipment

Abstract

The utility model discloses a power supply protection circuit and electronic equipment, and belongs to the technical field of power supplies. The driving circuit outputs a driving signal according to the control signal and disconnects the output of the driving signal when the current of the input direct current is greater than a first preset value; the inverter circuit is connected with the input direct current and stops inverting the input direct current based on the disconnection of the driving signal so as to disconnect the output of the first alternating current; therefore, the reliability and the safety of the power supply protection circuit are improved.

Description

Technical Field

[0001] This application belongs to the field of power supply technology, and in particular relates to a power protection circuit and electronic device. Background Technology

[0002] Elevators are classified as special safety equipment. Typically, the contactor control cabinet is powered by the high-voltage safety circuit. The brake contactor coil is controlled by a mainboard relay, and the brake contactor contacts control the elevator's braking. Frequent operation of the brake contactor generates noise, affecting the passenger experience (especially in machine-room-less and home elevators). Furthermore, arcing of the contactor contacts and mainboard relays can easily lead to failure of the contactor and the relays controlled by the mainboard. To address these issues, a low-voltage power supply is used to power the brake contactor, with the safety circuit door lock terminal serving as the high-voltage input source. A high-voltage to low-voltage power conversion device controls the brake. Currently, brake overcurrent protection on the market only provides a sampling signal to the control circuit for waveform blocking, which has the following problems:

[0003] 1. Abnormal failure of the control circuit itself or abnormality of the software program leads to unreliable waveform blocking, resulting in transistor overcurrent and transistor failure;

[0004] 2. If the chip between the control circuit and the transistor fails, it will cause a shoot-through between the upper and lower transistors. In this case, even if the control signal output by the control circuit is blocked, it will not be possible to prevent the abnormality of the downstream chip from causing a shoot-through to the ground and the transistor to explode.

[0005] Therefore, the reliability and safety of the related power protection circuits are poor. Utility Model Content

[0006] The purpose of this application is to provide a power protection circuit and an image sensor, aiming to solve the problem of poor reliability and safety of related power protection circuits.

[0007] This application provides a power protection circuit, including:

[0008] Control circuit, used to output control signals;

[0009] A drive circuit, connected to the control circuit, is used to output a drive signal according to the control signal, and to disconnect the output of the drive signal in response to the input DC current being greater than a first preset value.

[0010] An inverter circuit, connected to the drive circuit, is used to receive the input DC power and to invert the input DC power based on the disconnection of the drive signal, thereby disconnecting the output of the first AC power.

[0011] In one embodiment, it further includes:

[0012] A transformer circuit, connected to the inverter circuit, is used to transform the first AC power to output a second AC power.

[0013] A rectifier circuit, connected to the transformer circuit, is used to rectify the second AC power to output DC power;

[0014] A switching circuit, connected to the rectifier circuit and the control circuit, is used to transmit the output DC power according to a switching signal;

[0015] The control circuit is also used to generate the switching signal.

[0016] In one embodiment, it further includes:

[0017] The second buffer circuit, connected to the control circuit and the switching circuit, is used to stop buffering the switching signal in response to the current of the output DC power being greater than a second preset value.

[0018] The switching circuit is specifically used to disconnect the output of the DC power according to the stop of the switching signal.

[0019] In one embodiment, it further includes:

[0020] The second sampling circuit, connected to the rectifier circuit and the switching circuit, is used to sample the current of the output DC power to output a second sampling signal.

[0021] The second comparison circuit is connected to the second sampling circuit and the second buffer circuit, and compares the voltage of the second sampled signal with the second preset voltage to output a second comparison signal;

[0022] The second buffer circuit is specifically used to stop buffering the switch signal in response to the second comparison signal.

[0023] In one embodiment, the control circuit is also connected to the second comparison circuit and is further configured to disconnect the output of the switch signal based on the second comparison signal.

[0024] In one embodiment, it further includes:

[0025] A first buffer circuit, connected to the control circuit and the drive circuit, is used to stop buffering the control signal in response to the input DC current being greater than a first preset value.

[0026] The driving circuit is specifically used to output a driving signal according to the buffered control signal, and to disconnect the output of the driving signal in response to the input DC current being greater than a first preset value.

[0027] In one embodiment, the control circuit is also connected to the first buffer circuit and the drive circuit, and is used to compare the buffered control signal with the control signal output by itself, and disconnect the output of the control signal according to the comparison result.

[0028] In one embodiment, it further includes:

[0029] The first sampling circuit, connected to the inverter circuit, is used to sample the current of the input DC power supply to output a first sampling signal.

[0030] A first comparison circuit, connected to the first sampling circuit and the driving circuit, is used to compare the voltage of the first sampled signal with a first preset voltage to output a first comparison signal;

[0031] The driving circuit is specifically used to output a driving signal according to the control signal, and to disconnect the output of the driving signal in response to the comparison signal.

[0032] In one embodiment, the control circuit is also connected to the first comparison circuit and is further configured to disconnect the output of the control signal based on the first comparison signal.

[0033] This utility model embodiment also provides an electronic device, which includes the power protection circuit described above.

[0034] Compared with the prior art, the beneficial effects of this utility model embodiment are as follows: Since the driving circuit disconnects the output of the driving signal in response to the input DC current being greater than the first preset value; the inverter circuit stops inverting the input DC current based on the disconnection of the driving signal to disconnect the output of the first AC current; thus reducing the possibility of transistor overcurrent causing transistor failure due to abnormal failure of the control circuit itself or abnormality of the software program; at the same time, reducing the possibility of chip failure between the control circuit and the transistor causing the upper and lower transistors to shoot through, resulting in a ground fault and transistor failure; and improving the reliability and safety of the power supply protection circuit. Attached Figure Description

[0035] To more clearly illustrate the technical utility model in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of a power protection circuit provided in an embodiment of this application;

[0037] Figure 2 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0038] Figure 3 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0039] Figure 4 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0040] Figure 5 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0041] Figure 6 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0042] Figure 7 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0043] Figure 8 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0044] Figure 9 A schematic diagram of another structure of the power protection circuit provided in one embodiment of this application;

[0045] Figure 10 This is a partial example circuit diagram of a power protection circuit provided in an embodiment of this application. Detailed Implementation

[0046] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0047] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0048] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0050] Figure 1 A schematic diagram of the power protection circuit provided in a preferred embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0051] The aforementioned power protection circuit includes a control circuit 01, a drive circuit 02, and an inverter circuit 03.

[0052] Control circuit 01 is used to output control signals;

[0053] The drive circuit 02 is connected to the control circuit 01 and is used to output a drive signal according to the control signal. In response to the input DC current being greater than a first preset value, the output of the drive signal is disconnected.

[0054] Inverter circuit 03, connected to drive circuit 02, is used to receive input DC power and to invert the input DC power based on the disconnection of the drive signal, thereby disconnecting the output of the first AC power.

[0055] It should be noted that the inverter circuit 03 is also used to connect to the input DC power and invert the input DC power based on the drive signal to output the first AC power.

[0056] Inverter circuit 03 includes a single-phase half-bridge inverter circuit and a single-phase full-bridge inverter circuit.

[0057] like Figure 2 As shown, the power protection circuit also includes a transformer circuit 07, a rectifier circuit 08, and a switching circuit 09.

[0058] Transformer circuit 07, connected to inverter circuit 03, is used to transform the first AC power to output the second AC power;

[0059] The rectifier circuit 08, connected to the transformer circuit 07, is used to rectify the second AC power to output DC power.

[0060] Switching circuit 09 is connected to rectifier circuit 08 and control circuit 01, and is used to transmit output DC power according to switching signals.

[0061] Control circuit 01 is also used to generate switching signals.

[0062] Through the transformer circuit 07, rectifier circuit 08, and switching circuit 09, the above power protection circuit realizes the DC-DC conversion function, enriching the product's functionality.

[0063] like Figure 3 As shown, the power protection circuit described above also includes a second buffer circuit 10.

[0064] The second buffer circuit 10 is connected to the control circuit 01 and the switch circuit 09, and is used to stop buffering the switch signal in response to the output DC current being greater than a second preset value.

[0065] The switching circuit 09 is specifically used to disconnect the output of DC power according to the stop signal of the switch.

[0066] By blocking the switching signal, output overcurrent protection is achieved, further improving the reliability and safety of the power supply protection circuit.

[0067] like Figure 4 As shown, the power protection circuit also includes a second sampling circuit 11 and a second comparison circuit 12.

[0068] The second sampling circuit 11 is connected to the rectifier circuit 08 and the switching circuit 09, and is used to sample the current of the output DC power to output the second sampling signal.

[0069] The second comparison circuit 12 is connected to the second sampling circuit 11 and the second buffer circuit 10, and is used to compare the voltage of the second sampled signal with the second preset voltage to output the second comparison signal.

[0070] The second buffer circuit 10 is specifically used to stop buffering the switching signal in response to the second comparison signal.

[0071] It is understood that the second comparison circuit 12 is specifically used to output a second comparison signal in response to the voltage of the second sampling signal being greater than the second preset voltage;

[0072] The detection of the output DC current is achieved through the second sampling circuit 11 and the second comparison circuit 12. The circuit is simple and reliable.

[0073] like Figure 5As shown, the control circuit 01 is also connected to the second comparison circuit 12 and is also used to disconnect the output of the switch signal based on the second comparison signal.

[0074] By blocking the switching signal through control circuit 01, input overcurrent protection is achieved, further improving the reliability and safety of the power supply protection circuit.

[0075] like Figure 6 As shown, the power protection circuit described above also includes a first buffer circuit 04.

[0076] The first buffer circuit 04 is connected to the control circuit 01 and the drive circuit 02, and is used to stop buffering the control signal in response to the input DC current being greater than a first preset value.

[0077] The drive circuit 02 is specifically used to output a drive signal according to the buffered control signal, and to disconnect the output of the drive signal in response to the input DC current being greater than a first preset value.

[0078] By blocking the control signal through the first buffer circuit 04, input overcurrent protection is achieved, further improving the reliability and safety of the power supply protection circuit.

[0079] like Figure 7 As shown, the control circuit 01 is also connected to the first buffer circuit 04 and the drive circuit 02, and is used to compare the buffered control signal with its own output control signal, and disconnect the output of the control signal according to the comparison result.

[0080] By connecting it to the first buffer circuit 04 and the drive circuit 02, the control signal is blocked in the event of a failure of the first buffer circuit 04, which further improves the reliability and safety of the power protection circuit.

[0081] like Figure 8 As shown, the power protection circuit also includes a first sampling circuit 05 and a first comparison circuit 06.

[0082] The first sampling circuit 05 is connected to the inverter circuit 03 and is used to sample the current of the input DC power supply to output the first sampling signal.

[0083] The first comparison circuit 06 is connected to the first sampling circuit 05 and the driving circuit 02, and is used to compare the voltage of the first sampled signal with the first preset voltage to output the first comparison signal;

[0084] The drive circuit 02 is specifically used to output a drive signal according to the control signal, and to disconnect the output of the drive signal in response to the comparison signal.

[0085] It is understandable that the first buffer circuit 04 is also connected to the first comparison circuit 06, and is used to stop buffering the control signal in response to the first comparison signal.

[0086] The first comparison circuit 06 is specifically used to output a first comparison signal in response to the voltage of the first sampled signal being greater than a first preset voltage.

[0087] The detection of the input DC current is achieved through the first sampling circuit 05 and the first comparison circuit 06. The circuit is simple and reliable.

[0088] like Figure 9 As shown, the control circuit 01 is also connected to the first comparison circuit 06 and is also used to disconnect the output of the control signal based on the first comparison signal.

[0089] By blocking the control signal through control circuit 01, input overcurrent protection is achieved, further improving the reliability and safety of the power supply protection circuit.

[0090] Figure 10 The illustration shows a partial example circuit structure of a power protection circuit provided by an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0091] The first buffer circuit 04 controls the first buffer U1 and the second buffer U2.

[0092] The enable terminal EN of the first buffer U1 and the enable terminal EN of the second buffer U2 are connected and together form the first comparison signal input terminal of the first buffer circuit 04, which is connected to the first comparison circuit 06 to receive the first comparison signal; the first input terminal A1, the second input terminal A2, the third input terminal A3, and the fourth input terminal A4 of the first buffer U1 together form the control signal input terminal of the first buffer circuit 04, which is connected to the control circuit 01 to receive the control signal; the first output terminal Y1 of the first buffer U1 is connected to the first input terminal A1 of the second buffer U2. The second output terminal Y2 of the first buffer U1 is connected to the second input terminal A2 of the second buffer U2, the third output terminal Y3 of the first buffer U1 is connected to the third input terminal A3 of the second buffer U2, and the fourth output terminal Y4 of the first buffer U1 is connected to the fourth input terminal A4 of the second buffer U2. The first output terminal Y1, the second output terminal Y2, the third output terminal Y3, and the fourth output terminal Y4 of the first buffer U1 together constitute the control signal output terminal of the first buffer circuit 04, which is connected to the drive circuit 02 to output the buffered control signal.

[0093] By blocking the two buffers, the reliability of the blocking in the first buffer circuit 04 is improved.

[0094] The driving circuit 02 includes a first half-bridge driver U3, a second half-bridge driver U4, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.

[0095] The enable terminal EN of the first half-bridge driver U3 and the enable terminal EN of the second half-bridge driver U4 are connected and together form the first comparison signal input terminal of the drive circuit 02, which is connected to the first comparison circuit 06 to receive the first comparison signal; the A-phase input terminal VIA of the first half-bridge driver U3, the B-phase input terminal VIB of the first half-bridge driver U3, the A-phase input terminal VIA of the second half-bridge driver U4, and the B-phase input terminal VIB of the second half-bridge driver U4 together form the control signal input terminal of the drive circuit 02, which is connected to the first buffer circuit 04 to receive the buffered control signal; the A-phase output terminal VOA of the first half-bridge driver U3 is connected to the first end of the first resistor R1 and the negative terminal of the first diode D1, the B-phase output terminal VOB of the first half-bridge driver U3 is connected to the first end of the fourth resistor R4 and the negative terminal of the second diode D2, and the A-phase output terminal VOA of the second half-bridge driver U4 is connected to the first end of the fourth resistor R4 and the negative terminal of the second diode D2, and the B-phase output terminal VOB of the second half-bridge driver U4 is connected to the first end of the fourth resistor R4 and the negative terminal of the second diode D2, and the B-phase output terminal VOB of the second half-bridge driver U4 is connected to the first end of the fourth resistor R4 and the negative terminal of the second diode D2, and the B-phase output terminal VOA ... The output terminal VOA is connected to the first terminal of the fifth resistor R5 and the negative terminal of the third diode D3. The B-phase output terminal VOB of the second half-bridge driver U4 is connected to the first terminal of the eighth resistor R8 and the negative terminal of the fourth diode D4. The positive terminal of the first diode D1 is connected to the first terminal of the second resistor R2. The positive terminal of the second diode D2 is connected to the first terminal of the third resistor R3. The positive terminal of the third diode D1 is connected to the first terminal of the sixth resistor R6. The positive terminal of the fourth diode D4 is connected to the first terminal of the seventh resistor R7. The second terminals of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 together constitute the drive signal output terminal of the drive circuit 02, which is connected to the inverter circuit 03 to output the drive signal.

[0096] The drive circuit 02 can be used to drive the single-phase full-bridge inverter circuit 03.

[0097] The second buffer circuit 10 includes a third buffer U5.

[0098] The enable terminal EN of the third buffer U5 constitutes the second comparison signal input terminal of the second buffer circuit 10 and is connected to the second comparison circuit 12 to receive the second comparison signal; the first input terminal A1 and the second input terminal A2 of the third buffer U5 together constitute the switch signal input terminal of the second buffer circuit 10 and are connected to the control circuit 01 to receive the switch signal; the first output terminal Y1 and the second output terminal Y2 of the third buffer U5 together constitute the switch signal output terminal of the second buffer circuit 10 and are connected to the switch circuit 09 to output the buffered switch signal.

[0099] This circuit is simple, reliable, and has low hardware costs.

[0100] The control circuit 01 includes a digital signal processor U6.

[0101] The first general-purpose input / output terminal P1.1 of the digital signal processor U6 constitutes the first comparison signal input terminal of the control circuit 01, and is connected to the first comparison circuit 06 to receive the first comparison signal; the second general-purpose input / output terminal P1.2, the third general-purpose input / output terminal P1.3, the fourth general-purpose input / output terminal P1.4, and the fifth general-purpose input / output terminal P1.5 of the digital signal processor U6 together constitute the control signal output terminal of the control circuit 01, and are connected to the first buffer circuit 04 to output the control signal; the sixth general-purpose input / output terminal P1.6, the seventh general-purpose input / output terminal P1.7, and the... The eighth general-purpose input / output terminal P1.8 of the digital signal processor U6 and the ninth general-purpose input / output terminal P1.9 of the digital signal processor U6 together constitute the control signal input terminal of the control circuit 01, which is connected to the first buffer circuit 04 and the drive circuit 02 to receive the buffered control signal; the tenth general-purpose input / output terminal P2.0 of the digital signal processor U6 constitutes the second comparison signal input terminal of the control circuit 01, which is connected to the second comparison circuit 12 to receive the second comparison signal; the eleventh general-purpose input / output terminal P2.1 and the twelfth general-purpose input / output terminal P2.2 of the digital signal processor U6 together constitute the switch signal output terminal of the control circuit 01, which is connected to the second buffer circuit 10 to output the switch signal.

[0102] Using a digital signal processor as the control circuit 01 improves accuracy and reliability.

[0103] It is understandable that an isolation circuit 13 can be provided between the second buffer circuit 10 and the switching circuit 09. The isolation circuit 13 is used to isolate the buffered switching signal.

[0104] The following is based on the working principle. Figure 10 Further explanation is provided below:

[0105] The second general-purpose input / output terminal P1.2, the third general-purpose input / output terminal P1.3, the fourth general-purpose input / output terminal P1.4, and the fifth general-purpose input / output terminal P1.5 of the digital signal processor U6 output control signals.

[0106] Figure 10 The specific working principle shown can be categorized into the following three cases:

[0107] In the first case, the first sampling circuit 05 samples the current of the input DC power to output a first sampling signal; the first comparison circuit 06, in response to the voltage of the first sampling signal being greater than a first preset voltage, outputs a first comparison signal to the enable terminal EN of the first buffer U1, the enable terminal EN of the second buffer U2, the enable terminal EN of the first half-bridge driver U3, the enable terminal EN of the second half-bridge driver U4, and the first general-purpose input / output terminal P1.1 of the digital signal processor U6; the first buffer U1 and the second buffer U2, in response to the first comparison signal, stop buffering the control signal; the first half-bridge driver U3 and the second half-bridge driver U4, in response to the comparison signal, disconnect the output of the drive signal; the inverter circuit 03, based on the disconnection of the drive signal, stops inverting the input DC power to disconnect the output of the first AC power.

[0108] In the second case, the first sampling circuit 05 samples the current of the input DC power to output a first sampling signal; the first comparison circuit 06 stops outputting the first comparison signal to the enable terminal EN of the first buffer U1, the enable terminal EN of the second buffer U2, the enable terminal EN of the first half-bridge driver U3, the enable terminal EN of the second half-bridge driver U4, and the first general-purpose input / output terminal P1.1 of the digital signal processor U6 in response to the voltage of the first sampling signal; the first buffer U1 and the second buffer U2 buffer the control signal in response to the port of the first comparison signal; the first half-bridge driver U3 and the second half-bridge driver U4 output the drive signal according to the buffered control signal in response to the disconnection of the comparison signal; the inverter circuit 03 inverts the input DC power based on the drive signal to output the first AC power. Simultaneously, the first output terminal Y1, the second output terminal Y2, the third output terminal Y3, and the fourth output terminal Y4 of the first buffer U1 output the buffered control signal to the sixth general-purpose input / output terminal P1.6, the seventh general-purpose input / output terminal P1.7, the eighth general-purpose input / output terminal P1.8, and the ninth general-purpose input / output terminal P1.9 of the digital signal processor U6; the digital signal processor U6 compares the buffered control signal with its own output control signal, and disconnects the output of the control signal if the comparison result is inconsistent.

[0109] In the third case, the first sampling circuit 05 samples the current of the input DC power to output a first sampling signal; the first comparison circuit 06, in response to the voltage of the first sampling signal being less than or equal to a first preset voltage, stops outputting the first comparison signal to the enable terminal EN of the first buffer U1, the enable terminal EN of the second buffer U2, the enable terminal EN of the first half-bridge driver U3, the enable terminal EN of the second half-bridge driver U4, and the first general-purpose input / output terminal P1.1 of the digital signal processor U6; the first buffer U1 and the second buffer U2, in response to the port of the first comparison signal, buffer the control signal; the first half-bridge driver U3 and the second half-bridge driver U4, in response to the disconnection of the comparison signal, output a drive signal according to the buffered control signal; the inverter circuit 03 inverts the input DC power based on the drive signal to output a first AC power. Simultaneously, the first output terminal Y1, the second output terminal Y2, the third output terminal Y3, and the fourth output terminal Y4 of the first buffer U1 output the buffered control signal to the sixth general-purpose input / output terminal P1.6, the seventh general-purpose input / output terminal P1.7, the eighth general-purpose input / output terminal P1.8, and the ninth general-purpose input / output terminal P1.9 of the digital signal processor U6; the digital signal processor U6 controls the buffered control signal and its own output. The signals are compared, and if the comparison results are consistent, the output of the control signal is maintained; the transformer circuit 07 transforms the first AC power to output the second AC power; the rectifier circuit 08 rectifies the second AC power to output DC power; the eleventh general-purpose input / output terminal P2.1 and the twelfth general-purpose input / output terminal P2.2 of the digital signal processor U6 output switch signals to the first input terminal A1 and the second input terminal A2 of the third buffer U5; the second sampling circuit 11 samples the current of the output DC power to output the second sampling signal. If the voltage of the second sampling signal is greater than the second preset voltage, the second comparison circuit 12 outputs the second comparison signal to the tenth general-purpose input / output terminal P2.0 of the digital signal processor U6 and the enable terminal EN of the third buffer U5; the digital signal processor U6 disconnects the output of the switch signal based on the second comparison signal, and the third buffer U5 stops buffering the switch signal. The switch circuit 09 disconnects the output of the DC power according to the stop of the switch signal. When the voltage of the second sampled signal is less than or equal to the second preset voltage, the second comparison circuit 12 stops outputting the second comparison signal to the tenth general-purpose input / output terminal P2.0 of the digital signal processor U6 and the enable terminal EN of the third buffer U5; the digital signal processor U6 maintains the output of the switch signal, and the third buffer U5 buffers the switch signal, and the switch circuit outputs DC current according to the switch signal.

[0110] This utility model embodiment also provides an electronic device, which includes the power protection circuit described above.

[0111] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0112] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power supply protection circuit, characterized by, The application relates to a power supply device, comprising: a control circuit for outputting a control signal; a driving circuit connected with the control circuit, for outputting a driving signal according to the control signal, and stopping output of the driving signal in response to the current of input direct current being greater than a first preset value; an inverting circuit connected with the driving circuit, for connecting the input direct current, stopping inverting of the input direct current based on the stopping of the driving signal, and stopping output of first alternating current; a transforming circuit connected with the inverting circuit, for transforming the first alternating current to output second alternating current; a rectifying circuit connected with the transforming circuit, for rectifying the second alternating current to output direct current; a switching circuit connected with the rectifying circuit and the control circuit, for transmitting the output direct current according to a switching signal; the control circuit is further used for generating the switching signal; a second buffer circuit connected with the control circuit and the switching circuit, for stopping buffering of the switching signal in response to the current of the output direct current being greater than a second preset value; the switching circuit is specifically used for stopping output of the output direct current according to the stopping of the switching signal.

2. The power supply protection circuit of claim 1, wherein, Further comprising: a second sampling circuit connected with the rectifying circuit and the switching circuit, for sampling the current of the output direct current to output a second sampling signal; a second comparison circuit connected with the second sampling circuit and the second buffer circuit, for comparing the voltage of the second sampling signal with a second preset voltage to output a second comparison signal; the second buffer circuit is specifically used for stopping buffering of the switching signal in response to the second comparison signal.

3. The power supply protection circuit of claim 2, wherein, The control circuit is further connected with the second comparison circuit, and is further used for stopping output of the switching signal based on the second comparison signal.

4. The power supply protection circuit of claim 1, wherein, Further comprising: a first buffer circuit connected with the control circuit and the driving circuit, for stopping buffering of the control signal in response to the current of the input direct current being greater than the first preset value; the driving circuit is specifically used for outputting the driving signal according to the buffered control signal, and stopping output of the driving signal in response to the current of the input direct current being greater than the first preset value.

5. The power supply protection circuit of claim 4, wherein, The control circuit is further connected with the first buffer circuit and the driving circuit, for comparing the buffered control signal with the control signal output by itself, and stopping output of the control signal according to the comparison result.

6. The power supply protection circuit of claim 1, wherein, Further comprising: a first sampling circuit connected with the inverting circuit, for sampling the current of the input direct current to output a first sampling signal; a first comparison circuit connected with the first sampling circuit and the driving circuit, for comparing the voltage of the first sampling signal with a first preset voltage to output a first comparison signal; the driving circuit is specifically used for outputting the driving signal according to the control signal, and stopping output of the driving signal in response to the comparison signal.

7. The power supply protection circuit of claim 6, wherein, The control circuit is further connected with the first comparison circuit, and is further used for stopping output of the control signal based on the first comparison signal.

8. An electronic device, comprising: The electronic device includes the power protection circuit according to any one of claims 1 to 7.

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