Current redundancy detection circuit and intelligent fuse box

Abstract

The utility model discloses a current redundancy detection circuit and an intelligent fuse box, and the redundancy detection circuit detects a sampling unit through two detection loops of a switch control unit and a current detection unit, so as to obtain the current information of a load. When the current information detected by one detection loop is larger than the current threshold value, the main control unit controls the working state of the switch unit through the switch control unit so as to cut off the power supply loop of the load, due to the fact that the multiple detection loops are independent of one another, current detection on the load is not affected even if a single detection loop breaks down, and the detection efficiency is improved. Therefore, the redundancy detection circuit and the intelligent fuse box adopting the redundancy detection circuit have higher safety performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent fuse box technical field especially, it relates to a current redundancy detection circuit and intelligent fuse box. BACKGROUND

[0002] Traditional fuse box, through adopting fast melting fuse, slow melting fuse and board type fuse three different rated current specifications car fuse, to satisfy the power supply application of different scenes and demand of whole vehicle and then realize whole vehicle wiring harness and load protection. With the development of semiconductor technology, also respond to the demand of passenger car commercial vehicle electrical architecture "perceptible, controllable, evolvable" intelligent transformation, the current detection of existing intelligent fuse box is generally single detection loop, when the detection loop fails, current detection is easy to fail, therefore, urgently need to design a redundancy detection system with multiple detection loops. SUMMARY

[0003] Therefore, the utility model discloses a current redundancy detection circuit and intelligent fuse box to solve the problem of easy failure of current detection when the single detection loop of the existing intelligent fuse box fails.

[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is: a current redundancy detection circuit, comprising: a master control unit; a switch control unit connected with the input end of the sampling unit and the master control unit respectively, used for obtaining the first current information of the load and transmitting the obtained first current information to the master control unit; a current detection unit connected with the input end of the sampling unit and the master control unit respectively, used for obtaining the second current information of the load and transmitting the obtained second current information to the master control unit; a switch unit, the control end of the switch unit is connected to the output end of the switch control unit, and the battery voltage, the switch unit and the load are electrically connected in sequence to realize the power supply of the load;The master control unit is used for sending a control signal to the switch control unit when the first current information and / or the second current information is greater than the first current threshold value preset in the master control unit, to control the working state of the switch unit.

[0005] In some embodiments, the master control unit is also provided with a timing unit, the timing unit starts timing when the first current information and / or the second current information is greater than the first current threshold value preset in the master control unit, and the master control unit controls the switch unit to be disconnected through the switch control unit when the timing information reaches the time threshold value.

[0006] In some embodiments, the switch control unit is also preset with a second current threshold value, and the switch control unit directly controls the switch unit to be disconnected when the first current information is greater than the second current threshold value.

[0007] In some embodiments, the second current threshold is greater than the first current threshold.

[0008] In some embodiments, the switch control unit is further connected with a temperature detection unit, the temperature detection unit transmits the detected temperature information to the switch control unit, and when the temperature information is greater than a preset temperature threshold in the switch control unit, the switch control unit directly controls the switch unit to be turned off.

[0009] In some embodiments, the temperature detection unit is a temperature sensor.

[0010] In some embodiments, the sampling unit is a sampling resistor.

[0011] In some embodiments, the switch unit is composed of a plurality of parallel MOS tubes.

[0012] In some embodiments, the current detection unit is an AD detection circuit.

[0013] The utility model discloses an intelligent fuse box, including the current redundancy detection circuit.

[0014] Compared with the prior art, the utility model has the advantages that: the redundancy detection circuit of the utility model detects the sampling unit through the switch control unit and the current detection unit two detection circuits respectively to obtain the current information of the load respectively, when the current information detected by one of the detection circuits is greater than the current threshold, the main control unit controls the working state of the switch unit through the switch control unit to cut off the power supply circuit of the load, since the multiple detection circuits are independent of each other, even if a single detection circuit fails, the current detection of the load is not affected, so that the redundancy detection circuit and the intelligent fuse box adopting the redundancy detection circuit have higher safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings incorporated in the specification and forming a part thereof illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

[0016] Figure 1 The principle block diagram of the current redundancy detection circuit provided by the utility model is provided;

[0017] Figure 2 The circuit diagram of the current redundancy detection circuit provided by the utility model is provided. DETAILED DESCRIPTION

[0018] Various exemplary embodiments of the present application will now be described in detail with reference to the drawings. Note that the relative arrangement of the components and steps illustrated in these embodiments, numerical expressions, and numerical values are merely illustrative and do not limit the scope of the present application unless specifically stated otherwise.

[0019] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the scope of the application or its application or uses.

[0020] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification as appropriate.

[0021] In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0022] A current redundancy detection circuit, as shown in Figure 1 The current redundancy detection circuit mainly includes a master control unit, a switch control unit, a current detection unit, a sampling unit, and a switch unit. The switch control unit is connected to the input end of the sampling unit and the master control unit, used to obtain the first current information of the load and transmit the obtained first current information to the master control unit. The current detection unit is connected to the input end of the sampling unit and the master control unit, used to obtain the second current information of the load and transmit the obtained second current information to the master control unit. The control end of the switch unit is connected to the output end of the switch control unit, and the battery voltage, the switch unit, and the load are electrically connected in sequence to form a power supply loop of the load to realize power supply to the load. The master control unit is used to send a control signal to the switch control unit to control the working state of the switch unit when the first current information and / or the second current information is greater than a first current threshold value preset in the master control unit.

[0023] In this embodiment, as shown in Figure 2As shown, the sampling unit is a sampling resistor R3, the main control unit is an MCU with a control function, the switch control unit is a switch controller with intelligent fuse protection, specifically VNF1048, and the current detection unit is an AD detection circuit, specifically an operational amplifier CSA240MQ connected in series on both sides of the sampling resistor R3, the IN+ and IN- two pins of the operational amplifier CSA240MQ are connected to both ends of the sampling resistor R3, and the OUT pin of the operational amplifier CSA240MQ is connected to the AD module of the MCU to obtain the second current information of the load and transmit the second current information to the MCU; at the same time, the VS pin of the switch controller VNF1048 is directly connected to the sampling resistor R3 to obtain the first current information of the load, the switch controller VNF1048 is connected to the MCU through an SPI interface to transmit the first current information to the MCU, and the MCU compares the first current information and the second current information with the first current threshold preset in the main control unit to perform corresponding actions.

[0024] As shown in Figure 1 The switch unit is composed of a plurality of parallel MOS tubes, the drains of the plurality of MOS tubes are connected in parallel through the sampling resistor R3 to the battery voltage VBAT, the sources are connected in parallel to the load, and the gates are connected in parallel to the switch controller VNF1048, and the switch controller VNF1048 drives the on-off of the switch unit by applying a voltage to the gate and providing a driving current.

[0025] The redundant detection circuit detects the sampling unit through the switch control unit and the current detection unit to obtain the current information of the load, and when the current information detected by one of the detection circuits is greater than the current threshold, the main control unit controls the working state of the switch unit through the switch control unit to cut off the power supply circuit of the load. Since the multiple detection circuits are independent of each other, even if a single detection circuit fails, the current detection of the load is not affected, so that the redundant detection circuit and the intelligent fuse box using the redundant detection circuit have higher safety performance.

[0026] In some cases, the instantaneous current of the load may exceed the current threshold for a short time and then gradually recover to normal. Since the time is short, the load will not be damaged in this case, and therefore, the current detection of the load needs to have higher detection accuracy, that is, the time parameter can be coupled in the current detection process of the load, and when the current and the time both reach the corresponding threshold, the main control unit controls the switch unit to be disconnected through the switch control unit. Specifically, as shown in Figure 1As shown, the master control unit is further provided with a timing unit, the timing unit starts timing when the first current information and / or the second current information is greater than the first current threshold value preset in the master control unit, and when the timing information reaches a time threshold value, the master control unit controls the switch unit to be disconnected through the switch control unit.

[0027] Further, the switch control unit is further preset with a second current threshold value, the second current threshold value is generally greater than the first current threshold value, when the first current information is greater than the second current threshold value, the switch control unit directly controls the switch unit to be disconnected, so as to protect the switch control unit itself, prevent the instantaneous current of the load from being too large to cause damage to the switch control unit, and the switch control unit directly controls, which has the advantage of faster response. It should be noted here that the switch control unit directly controls is generally applied to the following two scenarios: (1) when the master control unit is damaged, the switch control unit will directly control the switch unit to be disconnected according to the preset second current threshold value; (2) when the load loop has a short circuit fault, the switch control unit will also directly control the switch unit to be disconnected according to the preset second current threshold value; the master controller can judge which fault by reading the register state of the switch controller VNF1048 and store it, which can be further provided for the field operators to retrieve, or the fault information is fed back to the external display terminal for display.

[0028] In an embodiment, as shown in Figure 1 and Figure 2 As shown, the switch control unit and the switch unit are further connected with a temperature detection unit, the temperature detection unit transmits the detected temperature information to the switch control unit, when the temperature information is greater than the temperature threshold value preset in the switch control unit, the switch control unit directly controls the switch unit to be disconnected, and the temperature detection unit is a temperature sensor TH1.

[0029] Although some specific embodiments of the utility model have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims

1. A current redundancy detection circuit, characterized by, The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit.

2. The current redundancy detection circuit of claim 1, wherein: The application relates to a current redundancy detection circuit.

3. The current redundancy detection circuit of claim 1, wherein: The application relates to a current redundancy detection circuit.

4. The current redundancy detection circuit of claim 3, wherein: The application relates to a current redundancy detection circuit.

5. The current redundancy detection circuit of claim 1, wherein: The application relates to a current redundancy detection circuit.

6. The current redundancy detection circuit of claim 5, wherein: The application relates to a current redundancy detection circuit.

7. The current redundancy detection circuit of claim 1, wherein: The application relates to a current redundancy detection circuit.

8. The current redundancy detection circuit of claim 1, wherein: The application relates to a current redundancy detection circuit.

9. The current redundancy detection circuit of claim 1, wherein: The application relates to a current redundancy detection circuit.

10. An intelligent fuse block characterized by: The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. The application relates to a current redundancy detection circuit. 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