WO2019041092A1

WO2019041092A1 - Automobile power line protection device

Info

Publication number: WO2019041092A1
Application number: PCT/CN2017/099282
Authority: WO
Inventors: 李文祥; 张荣秀
Original assignee: 深圳市锐明技术股份有限公司
Priority date: 2017-08-28
Filing date: 2017-08-28
Publication date: 2019-03-07
Also published as: CN209730800U

Abstract

An automobile power line protection device, comprising: a current detecting unit (10) connected to a device power signal; a voltage detecting unit (20) connected between a control unit (30) and an output interface; a control unit (30) separately connected to the current detecting unit (10), the voltage detecting unit (20), and a switch unit (40); the switch unit (40) connected to the control unit (30) and the current detecting unit (10); and a one-way conducting unit (50) connected between the switch unit (40) and the output interface. The current detecting unit (10) and the voltage detecting unit (20) detects the current and voltage of an automobile power line, and feed back a current abnormality signal when the current exceeds a preset current range and feed back a voltage abnormality signal when the voltage exceeds a preset voltage range; after receiving the current abnormality signal or the voltage abnormality signal, the control unit (30) controls the switch unit (40) to turn off, so as to disconnect the power line, thereby protecting an electronic device from being damaged, improving the security of the power line; moreover, the implementation is simple, and the costs are low.

Description

Automobile power line protection device

[0001] The present invention relates to the field of electronic technologies, and in particular, to an automotive power line protection device.

Background technique

[0002] Due to the large number of electronic devices on the car and the complicated wiring, the electronic devices are often damaged due to wiring errors. In addition, the cables on the car are often worn out, which may cause damage to the cables, thereby causing damage to the electronic devices. If the cable is connected incorrectly or the cable is damaged, the electronic device is damaged. The dedicated connector and harness protector are usually used for line protection. The dedicated connector can reduce the artificial connection error, and the harness protector can reduce the cable wear. The use of dedicated connectors and harness protectors does not fundamentally solve the problem, and there is still the possibility of line faults and damage, which can result in damage to the electronic equipment. In addition, dedicated connectors and harness protectors add additional cost.

[0003] In summary, the existing automotive power line protection method has the problems of low security and high cost.

technical problem

[0004] In order to solve the problem that the existing automobile power line protection method has low safety and high cost, the embodiment of the invention provides an automobile power line protection device.

Problem solution

Technical solution

[0005] An object of the present invention is to provide an automotive power line protection device, including:

[0006] a current detecting unit, connected to the device power signal, for detecting a current of the device, and the feedback current abnormal signal when the current exceeds a preset current range;

[0007] a voltage detecting unit is connected between the control unit and the output interface, wherein the voltage detecting unit is configured to detect a voltage of the device, and the feedback voltage abnormal signal is generated when the voltage exceeds a preset voltage range;

[0008] a control unit is respectively connected to the current detecting unit, the voltage detecting unit and the switching unit, and the control unit is configured to feed back corresponding control according to the detection results of the current detecting unit and the voltage detecting unit Signal

[0009] a switching unit, connected to the control unit and the current detecting unit, wherein the switching unit is configured to The control signal of the control unit is turned on or off;

[0010] The unidirectional conduction unit is connected between the switching unit and the output interface, and the unidirectional conduction unit is used for the unidirectional conduction circuit to prevent external current from entering the device.

Advantageous effects of the invention

Beneficial effect

[0011] The present invention provides a vehicle power line protection device, comprising: a current detecting unit connected to a device power signal, a voltage detecting unit connected between the control unit and the output interface, and the current detecting unit, respectively a voltage detecting unit and a control unit connected to the switching unit, a switching unit connected to the control unit and the current detecting unit, and a one-way unit connected between the switching unit and the output interface, through the current detecting unit and The voltage detecting unit detects the current and voltage of the vehicle power line, and when the current exceeds the preset current range, the feedback current abnormal signal, and the voltage exceeds the preset voltage range, the feedback voltage abnormal signal, the control unit receives the current abnormal signal or the voltage abnormal signal. After that, the control unit is turned off, and the power supply line is cut off to protect the electronic equipment from damage. In addition, the single-directional conduction unit can conduct only one-way conduction, effectively preventing external current from damaging the device, and improving the safety of the power supply line. Simple to implement, low cost, effective The existing automobile power line protection method has the problems of low safety and high cost.

Brief description of the drawing

DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are merely Some embodiments of the present invention may also be used to obtain other drawings based on these drawings without departing from the skilled artisan.

1 is a schematic structural diagram of a power line protection device for an automobile according to an embodiment of the present invention;

2 is a schematic circuit diagram of a current detecting unit in a power line protection device for an automobile according to another embodiment of the present invention;

3 is a schematic structural diagram of a voltage detecting unit in a power line protection device for an automobile according to another embodiment of the present invention;

4 is a schematic diagram of a circuit structure of an automobile power line protection device according to a new embodiment of the present invention. []

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0018] In order to solve the problem that the existing automobile power line protection method has low safety and high cost, the embodiment of the present invention provides an automobile power line protection device, which detects a vehicle power line through a current detecting unit and a voltage detecting unit. Current and voltage, and when the current exceeds the preset current range 吋 feedback current abnormal signal, when the voltage exceeds the preset voltage range 吋 feedback voltage abnormal signal, the control unit will control the shutoff unit to turn off after receiving the current abnormal signal or the voltage abnormal signal In addition, the power supply line is disconnected, and the electronic equipment is protected from damage. In addition, the single-directional conduction unit can conduct only one-way conduction, effectively prevent external current from damaging the device, improve the safety of the power supply line, and is simple to implement and low in cost.

[0019] In order to explain the technical solutions provided by the embodiments of the present invention, the following description is made by way of specific embodiments.

1 shows a structure of an automobile power line protection device according to an embodiment of the present invention. As shown in FIG. 1, the vehicle power line protection device 100 includes: a current detecting unit 10, a voltage detecting unit 20, and a control unit. 30. A shut-off unit 40 and a one-way unit 50.

[0021] The current detecting unit 10 is connected to the device power signal for detecting the current of the device, and the feedback current abnormal signal when the current exceeds the preset current range.

[0022] The voltage detecting unit 20 is connected between the control unit 30 and the output interface, and the voltage detecting unit 20 is configured to detect the voltage of the device and feedback the voltage abnormal signal when the voltage exceeds the preset voltage range.

The control unit 30 is connected to the current detecting unit 10, the voltage detecting unit 20, and the switching unit 40, respectively, and the control unit 30 is configured to feed back corresponding control signals according to the detection results of the current detecting unit 10 and the voltage detecting unit 20.

[0024] The switching unit 40 is connected to the control unit 30 and the current detecting unit 20, and the switching unit 40 is configured to be turned on or off according to a control signal of the control unit 30.

[0025] The unidirectional conduction unit 50 is connected between the switching unit 40 and the output interface, and the unidirectional conduction unit 50 is used for the single A conductive circuit that prevents external current from entering the device.

[0026] The current detecting unit 10 detects the current of the vehicle power line, the voltage detecting unit 20 detects the voltage of the vehicle power line, and the current detecting unit 10 supplies the feedback current abnormality signal to the control unit 30 when the current exceeds the preset current range, and the voltage detecting unit 20, when the voltage exceeds the preset voltage range, the feedback voltage abnormality signal is sent to the control unit 30, and after receiving the current abnormality signal or the voltage abnormality signal, the control unit 30 controls the shut-off unit 40 to turn off, thereby breaking the power supply line, through a single guide. The through unit 50 is unidirectionally conductive, effectively preventing external current from damaging the device and improving the safety of the power line.

[0027] Further, as an implementation of an embodiment of the present invention, the current detecting unit 10 includes: a signal amplifying unit and a comparing unit.

[0028] a signal amplifying unit, configured to acquire a corresponding voltage according to a current of the power signal, and amplify the obtained voltage;

[0029] the comparing unit is connected to the signal amplifying unit, and the comparing unit is configured to compare the amplified voltage value with the first preset voltage threshold, and after the signal amplified voltage value is greater than the first preset voltage threshold, Feedback current anomaly signal.

2 is a circuit diagram of a current detecting unit 10 of an automotive power line protection device according to another embodiment of the present invention. As shown in FIG. 2, the current detecting unit includes: a signal amplifying unit 11 and comparison. Unit 12.

[0031] As an implementation manner of the embodiment of the present invention, the signal amplifying unit 11 includes a first resistor R1 and an operational amplifier Ul.

[0032] The first end of the first resistor R1 is connected to the device power signal, and the second end of the first resistor R1 is connected to the switch unit 40, and the first input end of the operational amplifier U1 and the first end of the first resistor R1 Connected, the second input of the operational amplifier U 2 is coupled to the second terminal of the first resistor R1, and the output of the operational amplifier U1 is coupled to the comparison unit 12.

[0033] Preferably, as an implementation manner of the embodiment of the present invention, the comparing unit 12 includes a first voltage comparator U2.

[0034] The first input end of the first voltage comparator U2 is connected to the signal amplifying unit 11, and the second input end of the first voltage comparator U2 is connected to the first preset voltage VI, and the output end of the first voltage comparator U1 It is connected to the control unit 30. [0035] It should be noted that the first preset voltage VI refers to a voltage value that is set to measure whether the current of the device power signal exceeds a preset current range.

3 is a circuit diagram of a voltage detecting unit 20 of an automotive power line protection device according to another embodiment of the present invention. As shown in FIG. 3, the voltage detecting unit 20 includes a second voltage comparator U3.

[0037] The first input end of the second voltage comparator U3 is connected to the output interface, the second input end of the second voltage comparator U2 is connected to the second preset voltage V2, and the output end and control of the second voltage comparator U2 Units 30 are connected.

[0038] It should be noted that the second preset voltage V2 refers to a voltage value that is set to measure whether the device voltage exceeds a preset voltage range.

Referring to FIG. 4, FIG. 4 is a circuit structural diagram of a power line protection device for an automobile according to another embodiment of the present invention. As shown in FIG. 4, the above-mentioned switching unit 40 includes a bypass tube Q1.

[0040] The controlled end of the bypass tube Q1 is connected to the control unit 30, and the high potential end of the bypass tube Q1 and the current detecting unit 1

0 connection, the low potential end of the Q1 is connected to the one-way unit 50.

[0041] Preferably, the bypass transistor Q1 is a PMOS transistor, the controlled end of the bypass transistor Q1 is the gate of the PMOS transistor, the high potential end of the Q1 bypass transistor is the source of the PMOS transistor, and the Q1 bypass transistor The low potential terminal is the drain of the PMOS transistor.

[0042] Preferably, the above-mentioned unidirectional conduction unit 50 includes a diode D1, the anode of the diode D1 is connected to the bypass unit 40, and the cathode of the diode D1 is connected to the output interface.

[0043] Preferably, the control unit 30 includes a logic control element U4, the first control end of the logic control element U4 is connected to the current detecting unit 10, and the second control end of the logic control element U4 is connected to the voltage detecting unit 20, logic control The output of the component U4 is connected to the switching unit 40.

[0044] Preferably, as an implementation manner of the embodiment of the present invention, the foregoing control unit 30 includes a single chip microcomputer. It should be noted that the control unit 30 can detect the current detecting unit 10 and the voltage detecting unit 2 by the single chip microcomputer.

Whether or not the abnormal signal is fed back, and one of the current detecting unit 10 and the voltage detecting unit 20 feeds back the abnormal signal 吋, and the control unit is turned off.

[0045] The working principle of the vehicle power line protection device provided by the embodiment of the present invention is described in detail below with reference to FIG. 4:

[0046] The current obtained by the current detecting unit 10 after the current obtained from the device power signal passes through the first resistor, and a voltage drop is generated. The operational amplifier U1 amplifies the generated voltage drop, and then sends the amplified voltage value to the first voltage for comparison. U2, the first voltage comparator U2 compares the amplified voltage value with the first preset voltage V1, When the amplified voltage value is greater than the first preset voltage VI吋, indicating that the current magnitude of the device exceeds the preset current range, the first voltage comparator U2 outputs a current abnormality signal to the control unit 30, exemplarily, When the amplified voltage value is greater than the first predetermined voltage VI吋, the first voltage comparator U2 outputs a high level.

[0047] The voltage detecting unit 20 detects the voltage value of the device, and sends the voltage value of the device to the second voltage comparator U3.

The second voltage comparator U3 compares the voltage value of the device with the second preset voltage V2. When the voltage value of the device is greater than the second preset voltage V2, the voltage of the device exceeds the preset voltage range. The two voltage comparator U2 outputs a voltage abnormality signal to the control unit 30. Illustratively, when the voltage value of the device is greater than the second predetermined voltage V2, the second voltage comparator U3 outputs a high level.

[0048] The logic control element or the single chip microcomputer of the control unit 30 receives the current abnormality signal fed back by the current detecting unit 10, or receives the voltage abnormality signal fed back by the voltage detecting unit 20, or receives the current detecting unit 10 at the same time. The feedback current abnormality signal and the voltage abnormality signal 输 outputted by the voltage detecting unit 20 are outputted, and the control unit outputs a shutdown control signal to control the shutdown unit 40 to be turned off, thereby causing the power supply line to be broken. Exemplarily, the logic control component is a logic NAND gate. When the first voltage comparator U2 outputs a high level or the second voltage comparator U3 outputs a high level 吋, the logic NAND gate outputs a low level. The bypass pipe Q1 does not satisfy the conduction condition, so the shut-off pipe Q1 is turned off, which in turn causes the power supply line to be broken.

The vehicle power line protection device provided by the embodiment of the invention can detect the current and voltage of the vehicle power line through the current detecting unit and the voltage detecting unit, and feedback the current abnormal signal when the current exceeds the preset current range. The voltage exceeds the preset voltage range 吋 feedback voltage abnormal signal. After receiving the current abnormal signal or the voltage abnormal signal, the control unit will control the shut-off unit to turn off, and then the power supply line is disconnected, and the protection electronic device is not damaged. It can only conduct electricity in one direction, effectively prevent external current from damaging the equipment, improve the safety of the power line, and is simple to implement and low in cost.

[0050] The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. It is not intended that the specific embodiments of the invention are limited to the description. It will be apparent to those skilled in the art that <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The scope of patent protection as determined by the book.

Claims

Claim

[Claim 1] A vehicle power line protection device, wherein the vehicle power line protection device comprises:

The current detecting unit is connected to the device power signal for detecting the current of the device, and the feedback current abnormal signal is exceeded when the current exceeds the preset current range; the voltage detecting unit is connected between the control unit and the output interface, the voltage The detecting unit is configured to detect a voltage of the device, and the feedback voltage abnormal signal is exceeded when the voltage exceeds a preset voltage range;

The control unit is respectively connected to the current detecting unit, the voltage detecting unit and the switching unit, and the control unit is configured to feed back a corresponding control signal according to the detection result of the current detecting unit and the voltage detecting unit;

a switching unit connected to the control unit and the current detecting unit, wherein the switching unit is configured to be turned on or off according to a control signal of the control unit;

The single-conducting unit is connected between the switching unit and the output interface, and the single-conducting unit is used for a single-conducting circuit to prevent external current from entering the device.

[Claim 2] The vehicle power line protection device according to claim 1, wherein the current detecting unit comprises: a signal amplifying unit and a comparing unit;

The signal amplifying unit is configured to acquire a corresponding voltage according to a current of the power signal, and amplify the obtained voltage;

The comparing unit is connected to the signal amplifying unit, and the comparing unit is configured to compare the amplified voltage value with the first preset voltage threshold, and the voltage value after the signal amplification is greater than the first pre- Set the voltage threshold 吋 to feedback the current anomaly signal.

[Claim 3] The power line protection device for an automobile according to claim 2, wherein the signal amplifying unit comprises: a first resistor and an operational amplifier;

The first end of the first resistor is connected to the device power signal, the second end of the first resistor is connected to the switch unit, and the first input end of the operational amplifier is connected to the first end of the first resistor The second input end of the operational amplifier is connected to the second end of the first resistor, and the output end of the operational amplifier is connected to the comparison unit. The vehicle power line protection device according to claim 2, wherein the comparison unit comprises a first voltage comparator;

a first input end of the first voltage comparator is connected to the signal amplifying unit, a second input end of the first voltage comparator is connected to a first preset voltage, and an output end of the first voltage comparator Connected to the control unit.

The vehicle power line protection device according to claim 1, wherein the voltage detecting unit comprises a second voltage comparator;

The first input end of the second voltage comparator is connected to the output interface, the second input end of the second voltage comparator is connected to the second preset voltage, and the output end of the second voltage comparator and the control unit Connected.

The vehicle power line protection device according to claim 1, wherein the switching unit comprises a bypass tube;

The controlled end of the bypass tube is connected to the control unit, the high potential end of the bypass tube is connected to the current detecting unit, and the low potential end of the bypass tube is connected to the single conducting unit.

The automotive power line protection device according to claim 1, wherein the one-way unit comprises a diode;

The anode of the diode is connected to the switching unit, and the cathode of the diode is connected to the output interface.

The vehicle power line protection device according to claim 1, wherein the control unit comprises a logic control element;

a first control end of the logic control element is connected to the current detecting unit, a second control end of the logic control element is connected to the voltage detecting unit, an output end of the logic control element and the switching unit connection.

The automotive power line protection device according to claim 1, wherein said control unit comprises a single chip microcomputer.

The vehicle power line protection device according to claim 6, wherein the bypass tube is a PMOS tube, and the controlled end of the bypass tube is a gate of the PMOS tube, and the bypass tube The high potential end is the source of the PMOS tube, and the low potential end of the bypass tube is The drain of the PMOS transistor.