A control device with high response power-down detection and a vehicle

Abstract

The application provides a control device and a vehicle with high-response power-off detection, comprising a power input circuit, a control unit and a power-off detection circuit, wherein the power input circuit comprises a diode and a first capacitor, the positive electrode of the diode is used for connecting an input positive electrode, the negative electrode of the diode is connected with the positive electrode of the first capacitor and a power port of the control unit, and the negative electrode of the first capacitor is grounded; the power-off detection circuit comprises a switch tube, a first resistor and a second resistor, the first end of the first resistor is connected with the positive electrode of the diode, the first end of the second resistor is connected with the negative electrode of the diode and the drain electrode of the switch tube, the second end of the first resistor is connected with the second end of the second resistor and the gate electrode of the switch tube, and the source electrode of the switch tube is connected with the signal input port of the control unit. The application saves the analog port resources of the control unit, and can adjust the trigger pressure difference, thereby improving the response speed of the power-off detection and being capable of setting different trigger thresholds for different control devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit detection, in particular to a high-response power-down detection control device and a vehicle. BACKGROUND

[0002] There are more and more electronic devices in new energy vehicles and new energy work vehicles. In order to ensure the safety and reliability of the vehicle, the electronic devices are required to have a power-down detection function. After the external power supply is powered off, the internal main control chip of the vehicle first executes the power-down logic and then is powered off, which requires that the power-down detection circuit has a small delay and high reliability. In the prior art, a common scheme is to monitor the external power supply voltage by using a main control chip, and when the voltage is lower than a normal threshold, the power-down logic is executed. However, since the power supply voltage range is wide and the threshold is not fixed, accurate judgment cannot be made. Another scheme is to simultaneously detect the input power supply voltage and the internal auxiliary power supply voltage, compare the pressure difference, and when the pressure difference is greater than a certain threshold, the power-down logic is executed.

[0003] If only the input power supply voltage is detected to determine whether the voltage is within a normal value range and then power-down detection is performed, there will be a delay in the detection of the voltage by the sampling circuit and the main control chip, and at the same time, the input power supply voltage range is wide. When the input voltage is high, it also needs to be reduced to the minimum voltage threshold to detect the power-down, which leads to the problem of large detection delay. If the voltage pressure difference is detected to determine the power-down, two analog input ports of the main control chip will be occupied, and the response time of the sampling is also slow. SUMMARY

[0004] The first object of the present application is to provide a high-response power-down detection control device.

[0005] The second object of the present application is to provide a vehicle with the above control device.

[0006] In order to achieve the first object of the present application, the present application provides a high-response power-down detection control device, which comprises a power supply input circuit, a control unit and a power-down detection circuit. The power supply input circuit comprises a diode and a first capacitor. The positive electrode of the diode is used to connect the input positive electrode. The negative electrode of the diode is connected with the positive electrode of the first capacitor and the power supply port of the control unit. The negative electrode of the first capacitor is grounded. The power-down detection circuit comprises a switching tube, a first resistor and a second resistor. The first end of the first resistor is connected with the positive electrode of the diode. The first end of the second resistor is connected with the negative electrode of the diode and the drain electrode of the switching tube. The second end of the first resistor and the second end of the second resistor are connected with the gate electrode of the switching tube. The source electrode of the switching tube is connected with the signal input port of the control unit.

[0007] A further proposed solution is to include a third resistor and a fourth resistor in the power-down detection circuit. The first end of the third resistor is connected to the source of the switching transistor, the second end of the third resistor is connected to the first end of the fourth resistor and the signal input port of the control unit, and the second end of the fourth resistor is grounded.

[0008] A further proposed solution is that the power-down detection circuit also includes a third resistor, a fourth resistor, a fifth resistor, and a transistor. The first end of the third resistor is connected to the source of the switching transistor, the second end of the third resistor is connected to the first end of the fourth resistor and the base of the transistor, the second end of the fourth resistor and the emitter of the transistor are grounded, the collector of the transistor is connected to the first end of the fifth resistor and the signal input port of the control unit, and the second end of the fifth resistor is used to connect to the power supply.

[0009] A further improvement is that the power input circuit also includes a sixth resistor, with the first end of the sixth resistor connected to the positive terminal of the diode and the second end of the sixth resistor grounded.

[0010] A further proposed solution is that the power input circuit also includes a voltage regulator, a second capacitor, and a third capacitor. The input terminal of the voltage regulator is connected to the positive terminal of the second capacitor and the negative terminal of the diode, and the output terminal of the voltage regulator is connected to the positive terminal of the third capacitor and the power port of the control unit.

[0011] To achieve the second objective of the present invention, the present invention provides a vehicle including a control device as described above.

[0012] The beneficial effects of this invention are as follows: By using a diode and a first capacitor, when the input power supply fails, the input voltage Vin drops instantaneously. Since there is a first capacitor after diode D1 to support the voltage, the voltage Vth of the first capacitor does not drop immediately but decreases slowly. During this decrease, Vth voltage becomes higher than Vin voltage. When the voltage difference ΔV (ΔV = Vin - Vth) exceeds the turn-on voltage VGSth of switching transistor Q1, switching transistor Q1 turns on. This allows for the rapid transmission of the power failure detection signal to the signal input port of the control unit, enabling the control unit to immediately execute the power-down logic. Furthermore, this only occupies one signal input port, saving analog port resources for the control unit. Moreover, by setting two resistors on both sides of the diode and adjusting the resistance values ​​of the first and second resistors to change the trigger threshold of ΔV, the adjustable trigger voltage difference not only improves the response speed of power failure detection but also allows for setting different trigger thresholds for different control devices. Additionally, the power-off detection signal can be triggered by connecting the third and fourth resistors, or by setting a transistor so that a low-level detection signal is input to the control unit's signal input port when the transistor is turned on. Furthermore, the switching transistor is off when the power input circuit is powered on, and only turns on when power is off, thus not affecting the normal operation of the power input circuit. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the first embodiment of the control device of the present invention.

[0014] Figure 2 This is a voltage waveform diagram from the first embodiment of the control device of the present invention.

[0015] Figure 3 This is a structural diagram of the second embodiment of the control device of the present invention.

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0017] Control device embodiment:

[0018] Reference Figure 1 The control device includes a power input circuit, a control unit MCU, and a power failure detection circuit. The power input circuit includes a diode D1, a first capacitor C1, a voltage regulator U1, a second capacitor C2, a third capacitor C3, and a sixth resistor R6. The anode of diode D1 is connected to the input positive terminal. The first terminal of the sixth resistor R6 is connected to the anode of diode D1, and the second terminal of the sixth resistor R6 is grounded. The cathode of diode D1 is connected to the anode of the first capacitor C1, and the cathode of the first capacitor C1 is grounded. The input terminal of voltage regulator U1 is connected to the anode of the second capacitor C2 and the cathode of diode D1. The output terminal of voltage regulator U1 is connected to the anode of the third capacitor C3 and the power port of the control unit MCU. The cathodes of the second capacitor C2 and the third capacitor C3 are grounded.

[0019] The power-down detection circuit includes a switch Q1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a transistor Q2. The first end of the first resistor R1 is connected to the anode of diode D1. The first end of the second resistor R2 is connected to the cathode of diode D1 and the drain of switch Q1. The second end of the first resistor R1 is connected to the second end of the second resistor R2 and the gate of switch Q1. The first end of the third resistor R3 is connected to the source of switch Q1. The second end of the third resistor R3 is connected to the first end of the fourth resistor R4 and the base of transistor Q2. The second end of the fourth resistor R4 and the emitter of transistor Q2 are grounded. The collector of transistor Q2 is connected to the first end of the fifth resistor R5 and the signal input port of the control unit MCU. The second end of the fifth resistor R5 is used to connect to the power supply.

[0020] Reference Figure 2This case primarily uses the voltage difference between diode D1 to determine when power is lost. When the input power supply Vin is lost, the Vin voltage drops rapidly. Because there is a large-capacity supporting capacitor C1 after diode D1, the Vth voltage will not drop immediately, but will remain at a relatively high level for a short period. During the drop in Vin, the Vth voltage will be higher than the Vin voltage, resulting in a voltage difference ΔV = Vin - Vth. When the voltage difference ΔV is greater than the turn-on voltage VGSth of switch Q1, switch Q1 will turn on. ΔV can be changed by adjusting the resistance values ​​of the first resistors R1 and R2. The trigger threshold is ΔV = VGSth * (R1 + R2) / R1. The VTH voltage forms a loop through the source of Q1, the drain of Q1, the third resistor R3, the base of Q2, and the emitter of Q2. Current flows through the base of transistor Q2, and transistor Q2 is turned on, pulling the Fault-Poweroff signal low. This detection signal enters the signal input port of the control unit MCU. The signal input port can be the interrupt port of the control chip, and then the falling edge is captured. After the power is turned off, the signal transition can be captured immediately. Then the control unit executes the power-down logic, thereby protecting the safety of the vehicle and the user.

[0021] Reference Figure 3 In addition, the power failure detection circuit can also be used as follows: Figure 3 The arrangement shown involves a third resistor R3 and a fourth resistor R4 located after the source of the switching transistor Q1. The first terminal of the third resistor R3 is connected to the source of the switching transistor Q1, and the second terminal of the third resistor R3 is connected to the first terminal of the fourth resistor R4 and the signal input port of the control unit MCU. The second terminal of the fourth resistor R4 is grounded. When the voltage difference ΔV exceeds the turn-on voltage VGSth of the switching transistor Q1, the switching transistor Q1 can be turned on, thereby pulling the Fault-Poweroff signal low, triggering an interrupt in the control unit, and executing the power-down logic.

[0022] Vehicle Example:

[0023] The vehicle includes the control device described above. The control device is used to execute driving and operation procedures, and the vehicle can be a new energy electric car, a new energy electric bus, a new energy electric freight truck, a new energy electric cleaning vehicle, a new energy special operation vehicle, a new energy electric rail transit vehicle, a new energy electric air transport vehicle, a new energy electric shipping vehicle, etc.

[0024] Of course, the above embodiments are only preferred embodiments of this case. In practical applications, the power input circuit can have more varied arrangements, such as connecting the power port of the control unit directly or indirectly after the diode. The power input circuit can also be equipped with a transformer module, a voltage regulator module and / or a switching module according to actual needs. The power failure detection circuit can also have more varied arrangements, connecting the control unit directly or indirectly after the source of the switching transistor. Other types of trigger circuits can also be set after the source of the switching transistor, which can also achieve the purpose of this invention.

[0025] As can be seen from the above, by quickly sending the power failure detection signal to the signal input port of the control unit, the control unit immediately executes the power-down logic, and only occupies one signal input port, saving the analog port resources of the control unit. Furthermore, by setting two resistors on both sides of the diode, adjusting the resistance values ​​of the first and second resistors changes the trigger threshold of ΔV. Through the adjustable trigger voltage difference, not only is the response speed of power failure detection improved, but different trigger thresholds can also be set for different control devices.

Claims

1. A control device for high-response power-down detection, characterized in that, It includes a power input circuit, a control unit, and a power failure detection circuit. The power input circuit includes a diode and a first capacitor. The anode of the diode is connected to the input positive terminal, and the cathode of the diode is connected to the anode of the first capacitor and the power port of the control unit. The cathode of the first capacitor is grounded. The power-down detection circuit includes a switching transistor, a first resistor, and a second resistor. The first end of the first resistor is connected to the anode of the diode, the first end of the second resistor is connected to the cathode of the diode and the drain of the switching transistor, the second end of the first resistor is connected to the second end of the second resistor and the gate of the switching transistor, and the source of the switching transistor is connected to the signal input port of the control unit. When the voltage difference between the two terminals of the diode is greater than the turn-on voltage of the switching transistor, the switching transistor turns on, thereby sending the power-down detection signal to the signal input port of the control unit, and then the control unit immediately executes the power-down logic.

2. The control device according to claim 1, characterized in that: The power failure detection circuit further includes a third resistor and a fourth resistor. The first end of the third resistor is connected to the source of the switching transistor, the second end of the third resistor is connected to the first end of the fourth resistor and the signal input port of the control unit, and the second end of the fourth resistor is grounded.

3. The control device according to claim 1, characterized in that: The power failure detection circuit further includes a third resistor, a fourth resistor, a fifth resistor, and a transistor. The first end of the third resistor is connected to the source of the switching transistor. The second end of the third resistor is connected to the first end of the fourth resistor and the base of the transistor. The second end of the fourth resistor and the emitter of the transistor are grounded. The collector of the transistor is connected to the first end of the fifth resistor and the signal input port of the control unit. The second end of the fifth resistor is used to connect to the power supply.

4. The control device according to any one of claims 1 to 3, characterized in that: The power input circuit also includes a sixth resistor, the first end of which is connected to the positive terminal of the diode, and the second end of which is grounded.

5. The control device according to any one of claims 1 to 3, characterized in that: The power input circuit further includes a voltage regulator, a second capacitor, and a third capacitor. The input terminal of the voltage regulator is connected to the positive terminal of the second capacitor and the negative terminal of the diode. The output terminal of the voltage regulator is connected to the positive terminal of the third capacitor and the power port of the control unit.

6. A vehicle, characterized in that, Includes the control device as described in any one of claims 1 to 5 above.

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