CN220673385U

CN220673385U - Electronic device protection circuit

Info

Publication number: CN220673385U
Application number: CN202322342958.6U
Authority: CN
Inventors: 钱泗长; 单岳平
Original assignee: Chongqing Liangjiang Lianchuang Electronic Co ltd
Current assignee: Chongqing Liangjiang Lianchuang Electronic Co ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2024-03-26
Anticipated expiration: 2033-08-30

Abstract

The utility model provides an electronic device protection circuit, which comprises a power input end and a power output end, wherein a safety circuit and a standby circuit are connected in parallel between the power input end and the power output end, a fuse F1 is connected to the safety circuit, a detection circuit is arranged between the fuse F1 and the power output end VCC, the detection circuit comprises a first IO end IO_1 and a first pull-down resistor R1 of a micro-control unit respectively connected with the output end of the fuse F1, the output end of the first pull-down resistor R1 is connected with a grounding end, a switch component is connected to the standby circuit, the switch component is connected with a second IO end IO_2 of the micro-control unit, the switch state of the switch component is controlled by the second IO end IO_2, and the level state of the second IO end IO_2 is controlled by the micro-control unit. According to the electronic device protection circuit, the detection circuit and the standby circuit are added on the existing safety circuit, and the application range of the protection circuit is widened.

Description

Electronic device protection circuit

Technical Field

The utility model relates to the technical field of electronic circuits, in particular to an electronic device protection circuit.

Background

When a circuit fails or is abnormal, the current is increased, and the increased current may damage some important devices in the circuit, and may burn the circuit and even cause fire. The common method is to arrange a fuse in the circuit, and when the current abnormally rises to a certain height and heat, the fuse blows out to cut off the current, thereby playing a role in protecting the safe operation of the circuit.

However, the conventional method of adding a fuse to a circuit, while ensuring the safety of an electronic device to some extent, involves some of the safe electronic devices, such as vehicle instruments, medical care electronic products, etc., and in the case that other components of the electronic device are not damaged, it is not desirable to break the fuse into a non-functional state, which affects the use of the electronic device in the field or in an emergency, but it takes time and effort to disassemble the circuit to replace the fuse in the field or in an emergency.

Disclosure of Invention

Based on this, the present utility model aims to provide an electronic device protection circuit, so as to solve the technical problems existing in the prior art.

The utility model provides an electronic device protection circuit, which comprises a power INPUT end VCC_INPUT and a power output end VCC, wherein the power output end VCC is used for supplying power to an electronic device, a safety circuit and a standby circuit are connected in parallel between the power INPUT end VCC_INPUT and the power output end VCC, a fuse F1 is connected to the safety circuit, a detection circuit is arranged between the fuse F1 and the power output end VCC, the detection circuit comprises a first IO end IO_1 and a first pull-down resistor R1 of a micro control unit respectively connected with the output end of the fuse F1, the micro control unit is used for detecting the level state of the first IO end IO_1, the output end of the first pull-down resistor R1 is connected with a grounding end according to the power supply state of a level state feedback system of the first IO end IO_1, a switch component is connected to the standby circuit, the switch component is connected with a second IO end_2 of the micro control unit, the switch state of the switch component passes through the second IO end IO_2, and the level state of the second IO end IO 2 is controlled by the micro control unit.

The beneficial effects of the utility model are as follows: according to the electronic device protection circuit provided by the utility model, whether the fuse is disconnected or not is detected by the detection circuit, when the fuse F1 works normally, external current passes through the fuse F1 of the fuse circuit from the power INPUT end VCC_INPUT and is finally connected with an electronic device through the power output end VCC, when the system current is abnormal and the fuse F1 is disconnected, the first IO end IO_1 of the MCU detects that the fuse F1 is disconnected, the second IO end IO_2 of the MCU controls the switch assembly in the standby circuit to be conducted, the standby current is started, and the external current passes through the switch assembly and is connected with the power output end VCC after passing through the power INPUT end VCC_INPUT, so that the power output end VCC is recovered, and the electronic device is reused. The detection circuit and the standby circuit are added in the existing fuse protection circuit, and under the conditions that the fuse is disconnected and the electronic device is in good condition, the electronic device can start the standby circuit to be reused, so that the application range of the electronic device in an emergency is enlarged, further, the detection circuit detects that the first output end IO_1 outputs low level, and workers can be prompted that the fuse is broken and needs to be replaced in time.

Preferably, a current limiting resistor R2 is connected between the first IO terminal io_1 and the power output terminal VCC.

Preferably, the current limiting resistor R2 has a resistance of 1kΩ.

Preferably, the switch component is a MOS tube U1;

the micro-control unit controls the second IO end IO_2 to output a high level, and the second IO end IO_2 controls the MOS tube U1 to be conducted;

the micro control unit controls the second IO end IO_2 to output a low level, and the second IO end IO_2 controls the MOS tube U1 to be disconnected.

Preferably, the MOS tube U1 includes a G pin, a D pin, and an S pin, where the G pin is connected to the second IO terminal io_2, the D pin is connected to the power INPUT terminal vcc_input, and the S pin is connected to the power output terminal VCC.

Preferably, a second pull-down resistor R3 is connected between the second IO terminal io_2 and the ground terminal.

Preferably, the second pull-down resistor R3 has a resistance of 100kΩ.

Preferably, the fuse works normally, the output of the first IO terminal io_1 is at a high level, the fuse is disconnected, and the output of the first IO terminal io_1 is at a low level.

Preferably, the first pull-down resistor R1 has a resistance of 200kΩ.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device protection circuit provided by the present utility model.

The utility model will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Several embodiments of the utility model are presented in the figures. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Specifically, this embodiment provides an electronic device protection circuit, as shown in fig. 1, including a power INPUT end vcc_input and a power output end VCC, where the power INPUT end vcc_input is electrically connected with the outside and is used for supplying power to the whole circuit system, and the power output end VCC is electrically connected with the electronic device and is used for supplying power to the electronic device, that is, after the outside power passes through the protection circuit of the present application, the electronic device may be an automobile instrument, a medical care electronic product, etc.; and a safety circuit and a standby circuit are connected in parallel between the power INPUT end VCC_INPUT and the power output end VCC, a fuse F1 is connected to the safety circuit, and when the safety circuit is normally used, external current passes through the fuse F1 of the safety circuit from the power INPUT end VCC_INPUT and then is finally connected with an electronic device through the power output end VCC, and when the conditions such as overcurrent occur in the system circuit, the fuse fuses to protect the safety of the system circuit.

Optionally, a detection circuit is arranged between the fuse F1 and the power supply output end VCC, the detection circuit includes a Micro Control Unit (MCU) connected with the output end of the fuse F1 respectively, a first IO end io_1 and a first pull-down resistor R1, the MCU is used for detecting the level state of the first IO end io_1, and feeding back the power supply state of the system according to the level state of the first IO end io_1; specifically, when the system circuit supplies power normally, the fuse F1 is connected normally, the first IO end IO_1 outputs a high level, the MCU detects that the end IO_1 outputs a high level, the fuse is identified to work normally, and the system is prompted to supply power normally. When the system has the over-current and other conditions, the fuse F1 is disconnected, the electronic device is protected, the first IO end IO_1 outputs a low level, the MCU detects that the first IO end IO_1 outputs a low level, the fuse is identified to be burnt, and the system is prompted to supply power abnormally.

Optionally, the output end of the fuse F1 is connected to the first output end io_1 and the input end of the first pull-down resistor R1, the output end of the first pull-down resistor R1 is connected to the ground, and since the first output end io_1 is connected to the input end of the first pull-down resistor R1 and the output end of the first pull-down resistor R1 is connected to the ground, it can be ensured that the first output end io_1 outputs a low level when the fuse F1 is disconnected due to abnormal current; optionally, the standby circuit is connected with a switch component, the switch component is connected with a second IO end io_2 of the micro-control unit, a switch state of the switch component is controlled by the second IO end io_2, and a level state of the second IO end io_2 is controlled by the MCU, and optionally, in this embodiment, when the MCU controls an output high level of the second IO end io_2, the second IO end io_2 controls the switch component to be turned on, and when the MCU controls an output low level of the second IO end io_2, the second IO end io_2 controls the switch component to be turned off.

Optionally, in this embodiment, the system circuit supplies power normally, the fuse F1 is connected normally, the MCU controls the output low level of the second IO terminal io_2, the second IO terminal io_2 controls the switch component to be turned off, after the external current passes through the fuse F1 of the fuse circuit after passing through the vcc_input of the power INPUT terminal, the external current is connected to the electronic device through the VCC of the power output terminal, when the system circuit supplies power abnormally, the fuse F1 is disconnected, the VCC of the power output terminal cannot output current at this time, the electronic device cannot be used, the MCU detects that the IO terminal io_1 outputs low level, and prompts the system to supply power abnormally; the system carries out self-checking on the electronic device, if the operation condition of the electronic device is detected to be normal, only the fuse F1 is disconnected, at the moment, the MCU controls the output high level of the second IO end IO_2, the second IO end IO_2 controls the conduction of the switch assembly, the external current passes through the switch assembly from the power INPUT end VCC_INPUT and then is connected with the power output end VCC, so that the power output end VCC regains power, and finally, the electronic device is linked with the electronic device, and the electronic device is reused. According to the protection circuit, the detection circuit and the standby circuit are added in the conventional protection circuit, the state of the fuse in the protection circuit is timely detected through the detection circuit, and the standby circuit is started under the condition that the fuse F1 is disconnected, so that the electronic device is reused.

Optionally, in this embodiment, a current limiting resistor R2 is connected between the first IO terminal io_1 and the power output terminal VCC, where the current limiting resistor R2 can effectively reduce the current flowing into the first IO terminal io_1, and prevent the MCU from being damaged by a large current, and specifically, in this embodiment, the resistance value of the current limiting resistor R2 is 1kΩ.

Optionally, in this embodiment, the switch component is a MOS tube U1, and when the fuse is disconnected, the micro control unit controls the second IO terminal io_2 to output a high level, and the second IO terminal io_2 controls the MOS tube U1 to be turned on; when the fuse is normally used, the micro-control unit controls the second IO end IO_2 to output a low level, and the second IO end IO_2 controls the MOS tube U1 to be disconnected, so that the fuse circuit and the standby circuit can be used alternatively.

Optionally, in this embodiment, the MOS transistor includes a G pin, a D pin, and an S pin, where the G pin is connected with the second IO end io_2, the D pin is connected with the power INPUT end vcc_input, and the S pin is connected with the power output end VCC, preferably, a control signal is added between the G pin and the S pin through the second IO end io_2, so that the connection or disconnection between the D pin and the S pin can be changed, specifically, in this embodiment, the model of the MOS transistor U1 is RV8C010UN HZG, and the rest structures and working modes of the MOS transistor adopted in this embodiment are similar to those of the MOS transistor currently existing in the market, which are not described herein. Further, in this embodiment, a second pull-down resistor R3 is connected between the second IO terminal io_2 and the ground terminal, that is, one end of the second pull-down resistor R3 is connected to the G pin and the second IO terminal io_2, so as to ensure that the MOS tube U1 is in a closed state even if the control of the second IO terminal io_2 is not performed during normal operation of the fuse F1, and optionally, in this embodiment, the resistance of the second pull-down resistor R3 is 100kΩ. Further, in the present embodiment, the first pull-down resistor R1 has a resistance of 200kΩ.

In summary, the electronic device protection circuit provided by the utility model comprises a power INPUT end vcc_input and a power output end VCC, wherein the power output end VCC is used for supplying power to an electronic device, a safety circuit and a standby circuit are connected in parallel between the power INPUT end vcc_input and the power output end VCC, a fuse F1 is connected to the safety circuit, a detection circuit is arranged between the fuse F1 and the power output end VCC, the detection circuit is used for detecting whether the fuse is disconnected, when the fuse F1 works normally, external current passes through the fuse F1 of the safety circuit from the power INPUT end vcc_input and then is finally connected with the electronic device through the power output end VCC, when the system current is abnormal, the first IO end IO_1 of the MCU detects that the fuse F1 is disconnected, the second IO end IO_2 of the MCU controls the switch component in the standby circuit to be conducted, and the standby current is started, and the external current passes through the switch component and then is connected with the power output end VCC, so that the electronic device can acquire power again. According to the electronic device protection circuit, the detection circuit and the standby circuit are added in the existing fuse protection circuit, when the fuse is disconnected and the electronic device is in an intact state, the electronic device can enable the standby circuit to be reused, so that the application range of the electronic device in an emergency is enlarged, further, the detection circuit detects that the first output end IO_1 outputs low level, and workers can be prompted that the fuse is broken and needs to be replaced in time.

It should be noted that the foregoing implementation procedure is only for illustrating the feasibility of the present application, but this does not represent that the electronic device protection circuit of the present application has only a few implementation procedures, and instead, the present application may be incorporated into the feasible implementation of the electronic device protection circuit of the present application as long as it can be implemented.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The utility model provides an electronic device protection circuit, its characterized in that includes power INPUT end VCC_INPUT and power output end VCC, power output end VCC is used for supplying power for electronic device, power INPUT end VCC_INPUT with connect in parallel between the power output end VCC has safety circuit and stand-by circuit, be connected with fuse F1 on the safety circuit, fuse F1 with be equipped with detection circuitry between the power output end VCC, detection circuitry include respectively with micro-control unit first IO end IO_1 and first pull-down resistor R1 that fuse F1 output end is connected, micro-control unit is used for detecting the level state of first IO end IO_1 to according to the power supply state of the level state feedback system of first IO end IO_1, the output end and the ground connection of first pull-down resistor R1, be connected with switch module on the stand-by circuit, switch module with micro-control unit's second IO end_2 connection, switch module's on-off state passes through second IO end IO 2 IO control unit, the level state of second IO end IO 2 is controlled by micro-control unit.

2. The electronic device protection circuit according to claim 1, wherein a current limiting resistor R2 is connected between the first IO terminal io_1 and the power supply output terminal VCC.

3. The electronic device protection circuit of claim 2, wherein the current limiting resistor R2 has a resistance of 1kΩ.

4. The electronic device protection circuit of claim 1, wherein the switch component is a MOS transistor U1;

5. The electronic device protection circuit of claim 4, wherein the MOS transistor U1 comprises a G pin, a D pin, and an S pin, the G pin is connected to the second IO terminal io_2, the D pin is connected to the power INPUT terminal vcc_input, and the S pin is connected to the power output terminal VCC.

6. The electronic device protection circuit of claim 1, wherein a second pull-down resistor R3 is connected between the second IO terminal io_2 and the ground terminal.

7. The electronic device protection circuit of claim 6, wherein the second pull-down resistor R3 has a resistance of 100kΩ.

8. The electronic device protection circuit of claim 1, wherein the fuse operates normally, the first IO terminal io_1 output is high, the fuse is turned off, and the first IO terminal io_1 output is low.

9. The electronic device protection circuit of claim 1, wherein the first pull-down resistor R1 has a resistance of 200kΩ.