Hall sensor power supply control circuit for vehicle

Abstract

The utility model relates to the technical field of current detection of electric vehicles, and particularly discloses a power supply control circuit of a Hall sensor for a vehicle. According to the utility model, the driving unit is adopted to replace an existing MOS switch to carry out on-off control on the Hall sensor, on one hand, the circuit state of the control unit can be obtained in real time, and effective management on power supply of the Hall sensor is realized; on the other hand, the current-limiting resistor is added on the power supply line of the Hall sensor, so that the starting current cannot exceed the protection current of the driving unit, and the reliability of the driving unit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle current detection, in particular to a vehicle-used Hall sensor power supply control circuit. Background Art

[0002] With the popularity of new energy electric vehicles, the frequency of using Hall sensors in the detection of the total battery current is gradually increasing. When the Hall sensor is powered directly by the low-voltage power of the vehicle, it is necessary to control the power supply of the Hall sensor on and off, and turn off the power supply when the vehicle is not in use to reduce power consumption.

[0003] In the current existing Hall sensor power supply control, most PMOS tubes are used as switches for control. This type of control cannot determine whether the MOS switch is normal, cannot detect the short circuit, open circuit and overcurrent status of the switch, and cannot identify the status of the switch. When the MOS switch is open, the current cannot be collected and the fault point cannot be located; when the MOS switch is short-circuited, the Hall sensor is always consuming power, which will cause the low-voltage power supply of the entire vehicle to be undervoltage, resulting in the vehicle being unable to start. Summary of the invention

[0004] In order to overcome the problem that in the existing Hall sensor power supply control, a MOS switch is used for control but the current state of the switch circuit cannot be detected, etc., the utility model provides a Hall sensor power supply control circuit for a vehicle.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A vehicle Hall sensor power supply control circuit comprises a Hall sensor, a control unit and a controller, wherein the control unit is used to perform switch control on the power supply of the Hall sensor, and the control circuit further comprises a drive unit;

[0007] The driving unit includes a plurality of detection channels, each detection channel includes a first port and a second port;

[0008] The first port is connected to the output end of the control unit, and the second port is connected to the input end of the Hall sensor through a current limiting resistor R1;

[0009] The driving unit is used to detect the current state output by the control unit through the first port, report the current state to the controller, and input a starting current to the Hall sensor through the second port;

[0010] The controller is used to control the control unit according to the current state;

[0011] The control unit is further configured to provide a supply voltage to the driving unit.

[0012] According to a specific implementation, in the above control circuit, the current state includes a normal state and an abnormal state, and the abnormal state includes an open circuit, a short circuit, an overload, and an overtemperature.

[0013] According to a specific implementation, in the above control circuit, the controller is used to turn on the control unit according to the normal state, and turn off the control unit according to the abnormal state.

[0014] According to a specific implementation, in the above-mentioned control circuit, each detection channel also includes a driving logic module, a temperature sensing module, a voltage stabilizing module, and a switch module; pin a of the driving logic module is connected to the first port; pin b of the driving logic module is connected in parallel to the power supply voltage and the switch module through the temperature sensing module; the power supply voltage is connected to pin c of the driving logic module through the voltage stabilizing module; pin c of the driving logic module is also connected to the switch module; and the switch module is connected to the second port.

[0015] According to a specific implementation, in the above-mentioned control circuit, the voltage stabilizing module includes a diode Q1 and a voltage stabilizing tube Q2, the cathode of the diode Q1 is connected to the cathode of the voltage stabilizing tube Q2, the anode of the diode Q1 is connected to the supply voltage, and the anode of the voltage stabilizing tube Q2 is connected to the pin c of the driving logic module.

[0016] According to a specific implementation, in the above-mentioned control circuit, the switch module includes a DMOS tube Q3, the S pole of the DMOS tube Q3 is connected to the second port, the D pole of the DMOS tube Q3 is connected in parallel to the temperature sensing module and the power supply voltage, and the G pole of the DMOS tube Q3 is connected to pin c of the drive logic module.

[0017] According to a specific implementation, in the above control circuit, the temperature sensing module is used to limit the maximum allowable current in the control unit, and the temperature sensing module includes an absolute temperature sensor and a dynamic steady-state sensor.

[0018] According to a specific implementation, in the above control circuit, the driving unit is further used to lock the output of the second port of the corresponding detection channel according to the activation state of the temperature sensing module.

[0019] According to a specific implementation, in the above control circuit, the driving unit is grounded via a grounding resistor R2, and the grounding resistor R2 is used to limit the working voltage of the driving logic module to not exceed the protection voltage. According to a specific implementation, in the above control circuit, the current limiting resistor R1 is used to limit the starting current to not exceed the protection current of the driving unit.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model adopts a drive unit to replace the existing MOS switch to control the switch of the Hall sensor. On the one hand, it can obtain the switch state of the control unit in real time, realize the effective management of the power supply of the Hall sensor, and improve the safety of current detection of the electric vehicle; on the other hand, adding a current limiting resistor to the power supply line of the Hall sensor can ensure that the starting current does not exceed the protection current of the drive unit, thereby improving the reliability of the drive unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a Hall sensor power supply control circuit provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the circuit structure of the detection channel provided in the embodiment of the present application;

[0024] Figure 3 This is a connection diagram of a Hall sensor control circuit according to another embodiment of the present application. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present application being limited to the following embodiments, and all technologies implemented based on the present application belong to the scope of the present invention.

[0026] The terms "first", "second", etc. in the specification embodiments, claims, and drawings of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, including a series of steps or units. The method, system, product, or device is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0027] Example 1

[0028] Please refer to Figure 1 , which shows a schematic diagram of a Hall sensor power supply control circuit provided in an embodiment of the present application, wherein the control circuit includes a Hall sensor, a control unit and a controller, wherein the control unit is used to perform switch control on the power supply of the Hall sensor, and the control circuit also includes a driving unit.

[0029] The driving unit includes multiple detection channels, each detection channel includes a first port and a second port; the first port is connected to the output end of the control unit, and the second port is connected to the input end of the Hall sensor through a current limiting resistor R1; the driving unit is used to detect the current state output by the control unit through the first port, and report the current state to the controller, and output a starting current to the Hall sensor through the second port; the controller is used to control the control unit according to the current state; the control unit is also used to provide a power supply voltage to the driving unit.

[0030] The current state includes a normal state and an abnormal state, and the abnormal state includes an open circuit, a short circuit, an overload, and an overtemperature. The controller is used to turn on the control unit according to the normal state, and to turn off the control unit according to the abnormal state.

[0031] For further information, please refer to Figure 2 , which shows a circuit structure diagram of the detection channel provided in an embodiment of the present application, each detection channel also includes a driving logic module, a temperature sensing module, a voltage stabilizing module, and a switch module; pin a of the driving logic module is connected to the first port; pin b of the driving logic module is connected to the power supply voltage and the switch module in parallel through the temperature sensing module; the power supply voltage is connected to pin c of the driving logic module through the voltage stabilizing module; pin c of the driving logic module is also connected to the switch module; the switch module is connected to the second port.

[0032] The voltage stabilizing module includes a diode Q1 and a voltage stabilizing tube Q2, the cathode of the diode Q1 is connected to the cathode of the voltage stabilizing tube Q2, the anode of the diode Q1 is connected to the supply voltage, and the anode of the voltage stabilizing tube Q2 is connected to the pin c of the driving logic module.

[0033] The switch module includes a DMOS tube Q3, the S pole of the DMOS tube Q3 is connected to the second port, the D pole of the DMOS tube Q3 is connected in parallel to the temperature sensing module and the power supply voltage, and the G pole of the DMOS tube Q3 is connected to the pin c of the driving logic module.

[0034] Furthermore, the temperature sensing module is used to limit the maximum allowable current in the control unit, and the temperature sensing module includes an absolute temperature sensor and a dynamic steady-state sensor. The driving unit is also used to lock the output of the second port of the corresponding detection channel according to the activation state of the temperature sensing module.

[0035] Furthermore, the driving unit is grounded via a grounding resistor R2, and the grounding resistor R2 is used to limit the working voltage of the driving logic module to not exceed a protection voltage.

[0036] The pins of the driving unit are further introduced and illustrated below.

[0037] Specifically, the driving unit is further used to obtain an input signal to activate a channel through the first port. In a possible implementation, an INO pin is provided in the first port, and the pin is used to receive an input signal from a control unit, so that the driving unit activates a detection channel corresponding to the first port according to the input signal.

[0038] The driving unit is further configured to enable or disable detection of the driving unit through the first port. In a possible implementation, a DEN pin is provided in the first port, and the pin is configured to receive a start / stop signal of the driving unit, so that the driving unit enables or disables detection of the control unit according to the start / stop signal.

[0039] The driving unit is further configured to select a detection channel through the first port for current detection. In a possible implementation, a DSEL pin is provided in the first port, and the pin is configured to receive an indication signal for selecting a detection channel, so that the driving unit selects a corresponding detection channel for current detection according to the indication signal.

[0040] Furthermore, the first port is further provided with an IS pin, which is used to receive a current signal from the control unit, so that the driving unit obtains the current state of the control unit according to the current signal.

[0041] In a possible implementation, each detection channel corresponding to the above detection channel is provided with the same first port and second port, so multiple control units and multiple Hall sensors can be connected to detect the current state and start the current output. Therefore, when multiple control units are connected, the driving unit detects the current state of the control unit of the corresponding channel according to the different detection channels, and selects and switches through the DSEL pin.

[0042] It should be noted that, for the driving unit, at least two detection channels are included, and the circuit structure of each detection channel is the same as described above. At the same time, in the connection relationship, the pins in the detection channel and the pins of the driving unit are only distinguished for the connection of different circuit relationships. For example, the pin a is equivalent to the set of the pins INO, DEN, IS and DSEL, and the pins b and c are the internal functional module connection pins in the detection channel. That is, the function implemented by the driving unit through the pins INO, DEN, IS and DSEL is the same as the function implemented by the combination of the driving logic module, the voltage stabilizing module, the discharge point module and the temperature sensing module in the detection channel or each module, which will not be repeated here.

[0043] Furthermore, it should be noted that when the current state of the control unit is in an abnormal state, the driving unit still maintains detection, and when the abnormal state is eliminated, a normal state signal is transmitted to the controller at the same time, so that the controller restores the control unit. For example, when the temperature sensing module is activated, the control unit is overloaded or short-circuited at this time, causing its internal power to increase, exceeding the maximum allowable current. The driving unit transmits a current overload signal or a short-circuit signal to the controller, and at the same time locks the output of the detection channel connected to the control unit, so that the second port normally supplies power to the Hall sensor. The controller turns off the control unit according to the overload signal or the short-circuit signal. After a period of time, the temperature of the temperature sensing module corresponding to the detection channel drops to an unactivated state, that is, the circuit state returns to normal, and at the same time transmits a normal state signal to the controller, and the controller restores the control unit according to the normal state signal. In the remaining circuit states, the shutdown and recovery methods are roughly the same as above, so they will not be repeated.

[0044] At the same time, in a possible implementation, since the starting current of the Hall device is too large, it may trigger the overcurrent protection circuit of the drive unit. Therefore, the current limiting resistor R1 set in the embodiment of the present application is used to limit the starting current to not exceed the protection current of the drive unit.

[0045] Based on the above technical solution, this application uses a drive unit to replace the existing MOS switch to control the switch of the Hall sensor. On the one hand, it can obtain the switch state of the control unit in real time, realize the effective management of the power supply of the Hall sensor, and improve the safety of electric vehicle current detection. On the other hand, adding a current limiting resistor to the power supply line of the Hall sensor can ensure that the starting current does not exceed the protection current of the drive unit, thereby improving the reliability of the drive unit.

[0046] Example 2

[0047] In order to explain the control circuit provided by the present application in more detail, the control method of the control circuit of the above-mentioned embodiment 1 is described in detail below in combination with the implementation scenario. Figure 2 , which shows a connection diagram of a Hall sensor control circuit for collecting battery pack current in a mini van in the present application.

[0048] The battery pack of the mini van is 104 in series, with a rated voltage of 334V and a current range of 0~400A. Therefore, the Hall sensor adopts a 12V Hall, a power supply range of 9~16V, and CAN communication. The drive unit adopts a driver IC, model BTT6100-2ERA, which supports 12V or 24V power supply. The first port of the driver IC is connected to the control circuit, and the second port is connected to the Hall through a 2W / 10Ω current limiting resistor in series, and is grounded through a 27Ω grounding resistor R2. Because the starting current of the Hall device is too large, it may trigger the overcurrent protection circuit of the drive circuit. At the same time, the second port wants to add a current limiting resistor to the Hall power supply line to ensure that the starting current does not exceed the protection current of the driver IC, and the grounding resistor R2 is used to limit the operating voltage of the drive logic module to not exceed the protection voltage to ensure that the driver IC works normally. Among them, the first port includes pin INO, pin DEN, pin IS and pin DSEL.

[0049] Specifically, the INO pin is used to receive an input signal so that the driver IC activates the corresponding detection channel according to the input signal; the DEN pin is used to receive a start / stop signal so that the driver IC enables or disables the detection of the driver IC according to the start / stop signal; the IS pin is used to receive a current signal output by the control circuit so that the driver IC detects the current state of the control circuit according to the current signal; the DSEL pin receives an indication signal for selecting a detection channel so that the driver IC selects a detection channel for current detection according to the indication signal. The current state includes a normal state and an abnormal state, and the abnormal state includes an open circuit, a short circuit, an overload, and an overtemperature.

[0050] First, in the normal current collection state, the battery management system supplies power to the Hall sensor through the control circuit and transmits voltage and current signals through the first port. The IN0 pin activates the channel according to the signal, and the IS pin starts to continuously monitor the current.

[0051] It can be understood that when the driver IC needs to detect multiple connected lines, the driver IC can access different detection channels through the IN0 pin and the IN1 pin, select different detection channels through the DSEL pin, and then detect the current state of the control circuit connected to the channel through the current signal received by the IS pin. Further, the driver IC's own detection function can be enabled or disabled through the DEN pin.

[0052] Each detection channel is equipped with an absolute temperature sensor and a dynamic temperature sensor, so that the power in the control circuit is kept at a safe value, thereby limiting the maximum current allowed.

[0053] Furthermore, when an open circuit occurs in the control circuit, the driver IC can determine whether the load is connected by detecting the leakage current of the IS pin. If the load is not connected, the voltage and current are zero at this time, and the driver IC will feedback the fault to the controller and feedback the fault signal of the open circuit of the control circuit.

[0054] Furthermore, when the load in the control circuit is shorted to the power supply, the driver IC can determine that the load is shorted to the power supply by detecting the leakage current of the IS pin. At this time, the current in the control circuit is too large and the voltage is zero. The driver IC will feedback the fault to the controller, and the controller will cut off the control circuit.

[0055] Furthermore, when the load in the control circuit is overloaded / short-circuited / over-temperature, the absolute temperature sensor and the dynamic temperature sensor are used for control. When any temperature sensor is activated, it will cause overheating, making the channel relationship. At this time, the switch of the driver IC protection control circuit is turned off and the output is locked, which does not affect the normal power supply of the Hall sensor. At the same time, when the temperature of the control circuit drops to an acceptable value, it is restored. At the same time, the state of the IS pin is judged and the fault is reported.

[0056] When the battery management system is in sleep mode, the control circuit is turned off and the power supply stops.

[0057] Specifically, in this embodiment, the driver IC uses BTT6100-2ERA, and its diagnostic and protection functions are as follows:

[0058] Diagnostic functions: 1. Current detection; 2. Load open circuit detection; 3. Load short-circuited to power supply or ground indication; 4. Over-temperature shutdown detection.

[0059] Protection functions: 1. Over-temperature protection with latching function; 2. Over-voltage protection; 3. Short-circuit protection; 4. Overload.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle Hall sensor power supply control circuit, comprising a Hall sensor, a control unit and a controller, wherein the control unit is used to perform switch control on the power supply of the Hall sensor, characterized in that: Also includes a drive unit; The driving unit includes a plurality of detection channels, each detection channel includes a first port and a second port; The first port is connected to the output end of the control unit, and the second port is connected to the input end of the Hall sensor through a current limiting resistor R1; The driving unit is used to detect the current state output by the control unit through the first port, report the current state to the controller, and input a starting current to the Hall sensor through the second port; The controller is used to control the control unit according to the current state; The control unit is further configured to provide a supply voltage to the driving unit.

2. A vehicle Hall sensor power supply control circuit according to claim 1, characterized in that: The current state includes a normal state and an abnormal state, and the abnormal state includes an open circuit, a short circuit, an overload, and an overtemperature.

3. A vehicle Hall sensor power supply control circuit according to claim 2, characterized in that: The controller is used to turn on the control unit according to the normal state, and turn off the control unit according to the abnormal state.

4. The vehicle Hall sensor power supply control circuit according to claim 1, characterized in that: Each detection channel also includes a driving logic module, a temperature sensing module, a voltage stabilizing module, and a switch module; pin a of the driving logic module is connected to the first port; pin b of the driving logic module is connected in parallel to the power supply voltage and the switch module through the temperature sensing module; the power supply voltage is connected to pin c of the driving logic module through the voltage stabilizing module; pin c of the driving logic module is also connected to the switch module; and the switch module is connected to the second port.

5. The vehicle Hall sensor power supply control circuit according to claim 4, characterized in that: The voltage stabilizing module includes a diode Q1 and a voltage stabilizing tube Q2, the cathode of the diode Q1 is connected to the cathode of the voltage stabilizing tube Q2, the anode of the diode Q1 is connected to the supply voltage, and the anode of the voltage stabilizing tube Q2 is connected to the pin c of the driving logic module.

6. The vehicle Hall sensor power supply control circuit according to claim 4, characterized in that: The switch module includes a DMOS tube Q3, the S pole of the DMOS tube Q3 is connected to the second port, the D pole of the DMOS tube Q3 is connected in parallel to the temperature sensing module and the power supply voltage, and the G pole of the DMOS tube Q3 is connected to the pin c of the driving logic module.

7. The vehicle Hall sensor power supply control circuit according to claim 4, characterized in that: The temperature sensing module is used to limit the maximum allowable current in the control unit, and the temperature sensing module includes an absolute temperature sensor and a dynamic steady-state sensor.

8. The vehicle Hall sensor power supply control circuit according to claim 4, characterized in that: The driving unit is further used to lock the output of the second port of the corresponding detection channel according to the activation state of the temperature sensing module.

9. The vehicle Hall sensor power supply control circuit according to claim 4, characterized in that: The driving unit is grounded via a grounding resistor R2, and the grounding resistor R2 is used to limit the working voltage of the driving logic module to not exceed the protection voltage.

10. The vehicle Hall sensor power supply control circuit according to claim 1, characterized in that: The current limiting resistor R1 is used to limit the startup current to not exceed the protection current of the drive unit.

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