Response system and quick switching-in method of vehicle-mounted standby power supply

Abstract

The invention relates to a response system of a vehicle-mounted standby power supply and a rapid switching-in method, and belongs to the technical field of vehicle-mounted standby power supplies, and the response system comprises a battery pack, a charging circuit, an SBC circuit, a reference voltage circuit, an under-voltage detection circuit, a time delay circuit, a voltage sampling circuit, a control circuit, a driving circuit and a switching circuit. Wherein the charging circuit is connected between the battery pack and the vehicle-mounted power supply; the front ends of the SBC circuit and the reference voltage circuit are connected with a vehicle-mounted power supply and a battery pack, the rear end of the SBC circuit is connected with the under-voltage detection circuit and the switching circuit, and the rear end of the reference voltage circuit is connected with the delay circuit; the front ends of the under-voltage detection circuit and the voltage sampling circuit are connected with a vehicle-mounted power supply, the rear end of the under-voltage detection circuit is connected with the time-delay circuit, and the rear ends of the voltage sampling circuit and the time-delay circuit are connected with the control circuit; the rear end of the control circuit is connected with the driving circuit and the switching circuit. The battery pack is connected with a vehicle-mounted power supply in parallel through the switching circuit. The safety of the whole vehicle is improved by combining a hardware circuit with the MCU.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle-mounted backup power supplies, and in particular relates to a response system of a vehicle-mounted backup power supply and a method for quickly switching on a vehicle-mounted backup power supply. Background Art

[0002] The on-board power supply is mainly responsible for providing power for the electronic devices in the car. With the increasing use of electronic devices in electric vehicles, many electronic devices in the car require stable power supply. If the electronic devices do not work within their stable operating voltage, there is a risk of causing the entire system to be abnormal, especially the low-voltage safety load of the vehicle that involves the safety of the driver's life and property. Therefore, the on-board backup power supply is used as a backup for the on-board power supply to provide redundant power for the on-board safety load. At present, the on-board backup power supply of lithium batteries is more suitable for the requirements of electric vehicle technology for electrification, intelligence, and lightweight due to its high energy density, high volume density, long life, high charge and discharge rate, and good low-temperature performance. It is gradually replacing the on-board backup power supply of traditional lead-acid batteries.

[0003] The increasing demand for vehicle safety also places higher demands on vehicle backup power supplies. For example, the time requirement for the vehicle backup battery to cut in when the 12V power supply is undervoltage has been increased to 2ms in mid-to-high-end models. The current conventional method is mainly to continuously monitor the 12V power supply voltage through the controller, and use hardware sampling and software to determine whether the voltage value drops below the threshold, thereby controlling the cut-in of the backup battery. However, even with a high-performance processor, this control method can only achieve a response at the ms level. The voltage drop is completely determined by hardware logic, and the response speed is faster, but the cut-in time of this technology is currently almost the same as that of the conventional method.

[0004] Therefore, a method for quickly cutting in the on-board backup power supply with faster and smoother cut-in time is needed to respond quickly and reduce the safety risks of the entire vehicle and system. Summary of the invention

[0005] The purpose of the present invention is to provide a response system and a rapid cut-in method for a vehicle-mounted backup power supply in view of the problems existing in the prior art, so that the backup power supply can be quickly switched when the vehicle-mounted power supply is undervoltage, thereby ensuring the normal operation of the vehicle's electrical equipment.

[0006] The technical solution is as follows:

[0007] A response system for an on-board backup power supply comprises a battery pack, a charging circuit, an SBC circuit, a reference voltage circuit, an undervoltage detection circuit, a delay circuit, a voltage sampling circuit, a control circuit, a drive circuit and a switch circuit; wherein the charging circuit is connected between the battery pack and the on-board power supply so that the on-board power supply charges the battery pack; the front ends of the SBC circuit and the reference voltage circuit are both connected to the on-board power supply and the battery pack, the rear ends of the SBC circuit are connected to the undervoltage detection circuit and the switch circuit, and the rear ends of the reference voltage circuit are connected to the delay circuit; the front ends of the undervoltage detection circuit and the voltage sampling circuit are connected to the on-board power supply, the rear ends of the undervoltage detection circuit are connected to the delay circuit, the voltage transmitted to the delay circuit is changed when the on-board power supply is undervoltage, and the rear ends of the voltage sampling circuit and the delay circuit are both connected to the control circuit; the rear ends of the control circuit are connected to the drive circuit, the rear ends of the drive circuit are connected to the switch circuit, the battery pack is connected in parallel with the on-board power supply through the switch circuit, and the switch circuit controls whether the battery pack is incorporated into the on-board power supply.

[0008] Furthermore, the SBC circuit includes a system basis chip SBC, resistors and capacitors, and outputs a voltage V1 to power the undervoltage detection circuit and the control circuit.

[0009] Furthermore, the reference voltage circuit generates a voltage V2 to provide a reference voltage for the delay circuit and the control circuit.

[0010] Furthermore, the delay circuit is an RC circuit composed of a Schottky diode, an analog comparator, a capacitor and a resistor, wherein the voltage input by the undervoltage detection circuit is connected to the analog comparator after passing through the resistor and the voltage input by the reference voltage circuit are respectively connected to the analog comparator, the Schottky diode is connected in parallel at both ends of the resistor, and two capacitors connected in series are also connected in parallel to the two wirings of the comparator, and the two capacitors are grounded.

[0011] Furthermore, the resistance value of the resistor is 1M ohm and the capacitance value is 470pF.

[0012] Furthermore, the control circuit includes a microcontroller chip MCU, resistors and capacitors. The MCU receives the signal from the voltage sampling circuit, performs digital-to-analog conversion, and outputs an action command to the drive circuit.

[0013] Furthermore, the undervoltage detection circuit monitors whether the real-time voltage of the vehicle power supply is lower than the set voltage of the vehicle power supply through a combination of hardware, and adjusts its own voltage output.

[0014] Furthermore, a one-time programmable memory (Efuse) is provided in the driving circuit to notify the switch circuit to turn on or off according to the input action command.

[0015] Furthermore, a MOS tube is provided in the switch circuit, and the MOS tube switches the on-off state according to the voltage of the drive circuit.

[0016] A method for quickly switching on a vehicle-mounted backup power supply uses the above-mentioned vehicle-mounted backup power supply response system and performs the following steps:

[0017] Step 1: The undervoltage monitoring circuit monitors whether the real-time voltage of the vehicle power supply is lower than the set voltage. If so, the voltage of the input delay circuit is changed and the process goes to step 2. Otherwise, no action is taken and the real-time voltage of the vehicle power supply continues to be monitored.

[0018] Step 2: The voltage of the undervoltage monitoring circuit is different from the voltage generated by the reference voltage circuit after passing through the RC circuit in the delay circuit, and the delay circuit outputs an analog control signal to the drive circuit;

[0019] Step 3: The driving circuit converts the analog control signal into a digital control signal and controls the switch circuit to close, thereby connecting the battery pack to the vehicle power supply, and the battery pack supplies power to the load connected to the vehicle power supply;

[0020] Step 4: The voltage sampling circuit monitors whether the vehicle power supply voltage returns to the set voltage and sends a signal to the control circuit;

[0021] Step 5: The control circuit confirms whether to keep the switch circuit closed according to the signal. If yes, the battery pack continues to supply power to the load connected to the vehicle power supply. Otherwise, it goes to step 6.

[0022] Step 6: The control switch circuit is disconnected, the battery pack is disconnected from the vehicle power supply, the vehicle power supply directly supplies power to the connected load, and the vehicle power supply charges the battery pack through the charging circuit.

[0023] Beneficial effects:

[0024] 1) The present invention uses hardware logic to determine if the vehicle power supply is undervoltage, thereby realizing rapid replacement of the spare battery pack, and combines conventional MCU sampling and judgment assistance to better improve the safety of the entire vehicle.

[0025] 2) The circuit is simple, easy to use, effective, and low cost. It can significantly improve the functional safety level of the backup battery and the entire vehicle and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A logic circuit diagram of a response system of a vehicle-mounted backup power supply of the present invention;

[0027] Figure 2 It is a flow chart of the method for quickly switching in the vehicle-mounted backup power supply of the present invention;

[0028] Among them, 1 is a battery pack, 2 is a charging circuit, 3 is an SBC circuit, 4 is a reference voltage circuit, 5 is an undervoltage detection circuit, 6 is a delay circuit, 7 is a voltage sampling circuit, 8 is a control circuit, 9 is a drive circuit, 10 is a switch circuit, 11 is a resistor, and 12 is a capacitor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0030] like Figure 1 A response system of a vehicle-mounted backup power supply is shown, comprising a battery pack 1, a charging circuit 2, an SBC circuit 3, a reference voltage circuit 4, an undervoltage detection circuit 5, a delay circuit 6, a voltage sampling circuit 7, a control circuit 8, a drive circuit 9 and a switch circuit 10; wherein the charging circuit is connected between the battery pack and the vehicle-mounted power supply, so that the vehicle-mounted power supply charges the battery pack; the front ends of the SBC circuit and the reference voltage circuit are both connected to the vehicle-mounted power supply and the battery pack, the rear ends of the SBC circuit are connected to the undervoltage detection circuit and the switch circuit, and the rear ends of the reference voltage circuit are connected to the delay circuit; the front ends of the undervoltage detection circuit and the voltage sampling circuit are connected to the vehicle-mounted power supply, the rear ends of the undervoltage detection circuit are connected to the delay circuit, when the vehicle-mounted power supply is undervoltage, the voltage transmitted to the delay circuit is changed, and the rear ends of the voltage sampling circuit and the delay circuit are both connected to the control circuit; the rear ends of the control circuit are connected to the drive circuit, and the rear ends of the drive circuit are connected to the switch circuit, the battery pack is connected in parallel with the vehicle-mounted power supply through the switch circuit, and the switch circuit controls whether the battery pack is incorporated into the vehicle-mounted power supply.

[0031] The SBC circuit includes a system basis chip SBC, resistors and capacitors, and outputs a voltage V1 to power an undervoltage detection circuit and a control circuit. The system basis chip SBC model is UJA1169ATK.

[0032] The reference voltage circuit generates a voltage V2 to provide a reference voltage for the delay circuit and the control circuit.

[0033] The delay circuit is an RC circuit composed of a Schottky diode, an analog comparator, a capacitor 12, and a resistor 11, wherein the voltage input by the undervoltage detection circuit passes through the resistor and the voltage input by the reference voltage circuit are respectively connected to the analog comparator, the Schottky diode is connected in parallel at both ends of the resistor, and two capacitors connected in series are also connected in parallel to the two wirings of the comparator, the two capacitors are grounded, the resistance of the resistor is 1M ohm, and the capacitance of the capacitor is 470pF.

[0034] The control circuit includes a microcontroller chip MCU, resistors and capacitors. The MCU receives the signal from the voltage sampling circuit, performs digital-to-analog conversion, and outputs an action command to the drive circuit.

[0035] The undervoltage detection circuit monitors whether the real-time voltage of the vehicle power supply is lower than the set voltage of the vehicle power supply through a combination of hardware, and adjusts its own voltage output.

[0036] A one-time programmable memory (Efuse) is provided in the driving circuit to notify the switch circuit to turn on or off according to the input action command.

[0037] A MOS tube is provided in the switch circuit, and the MOS tube switches the on-off state according to the current of the driving circuit.

[0038] like Figure 2 A method for quickly switching on a vehicle backup power supply is shown, using the above-mentioned vehicle backup power supply response system and performing the following steps:

[0039] Step 1: The undervoltage monitoring circuit monitors whether the real-time voltage of the vehicle power supply is lower than the set voltage. If so, the voltage of the input delay circuit is changed and the process goes to step 2. Otherwise, no action is taken and the real-time voltage of the vehicle power supply continues to be monitored.

[0040] Step 2: The voltage of the undervoltage monitoring circuit is different from the voltage generated by the reference voltage circuit after passing through the RC circuit in the delay circuit, and the delay circuit outputs an analog control signal to the drive circuit;

[0041] Step 3: The driving circuit converts the analog control signal into a digital control signal and controls the switch circuit to close, thereby connecting the battery pack to the vehicle power supply, and the battery pack supplies power to the load connected to the vehicle power supply;

[0042] Step 4: The voltage sampling circuit monitors whether the vehicle power supply voltage returns to the set voltage and sends a signal to the control circuit;

[0043] Step 5: The control circuit confirms whether to keep the switch circuit closed according to the signal. If yes, the battery pack continues to supply power to the load connected to the vehicle power supply. Otherwise, it goes to step 6.

[0044] Step 6: The control switch circuit is disconnected, the battery pack is disconnected from the vehicle power supply, the vehicle power supply directly supplies power to the connected load, and the vehicle power supply charges the battery pack through the charging circuit.

[0045] Example 1: The vehicle-mounted backup power supply is 12V. During the operation of the vehicle, when the 12V power supply is pulled down to 11V, the undervoltage monitoring circuit quickly captures the undervoltage signal and outputs it through the delay circuit, causing the drive circuit to close the switch circuit and connect the battery pack to the load. From monitoring to voltage drop to the connection of the backup battery and the load, a rapid response of 0.8ms is achieved, and the load is quickly supplied with power. Subsequently, the control signal is output after sampling and processing by the voltage sampling circuit and the control circuit, confirming that the control drive circuit is required to close the switch and allowing the battery pack to output power, so as to meet the vehicle's 12V power supply being lower than 11V for 2ms and the backup battery's need to supplement the power supply, thereby ensuring uninterrupted power supply to the load.

[0046] 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 principles and spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A response system for a vehicle-mounted backup power supply, characterized in that: The invention comprises a battery pack (1), a charging circuit (2), an SBC circuit (3), a reference voltage circuit (4), an undervoltage detection circuit (5), a delay circuit (6), a voltage sampling circuit (7), a control circuit (8), a drive circuit (9) and a switch circuit (10); wherein the charging circuit is connected between the battery pack and the vehicle power supply so that the vehicle power supply charges the battery pack; the front ends of the SBC circuit and the reference voltage circuit are both connected to the vehicle power supply and the battery pack, the rear ends of the SBC circuit are connected to the undervoltage detection circuit and the switch circuit, and the rear ends of the reference voltage circuit are connected to the delay circuit; the front ends of the undervoltage detection circuit and the voltage sampling circuit are connected to the vehicle power supply, the rear ends of the undervoltage detection circuit are connected to the delay circuit, and when the vehicle power supply is undervoltage, the voltage transmitted to the delay circuit is changed, and the rear ends of the voltage sampling circuit and the delay circuit are both connected to the control circuit; the rear ends of the control circuit are connected to the drive circuit, and the rear ends of the drive circuit are connected to the switch circuit; the battery pack is connected in parallel with the vehicle power supply through the switch circuit, and the switch circuit controls whether the battery pack is incorporated into the vehicle power supply.

2. The vehicle-mounted backup power response system as claimed in claim 1, characterized in that: The SBC circuit includes a system basic chip SBC, resistors and capacitors, and outputs a voltage V1 to supply power to an undervoltage detection circuit and a control circuit.

3. The vehicle-mounted backup power response system as claimed in claim 1, characterized in that: The reference voltage circuit generates a voltage V2 to provide a reference voltage for the delay circuit and the control circuit.

4. The vehicle-mounted backup power response system as claimed in claim 1, characterized in that: The delay circuit is an RC circuit composed of a Schottky diode, an analog comparator, a capacitor (12) and a resistor (11), wherein the voltage input by the undervoltage detection circuit is connected to the analog comparator after passing through the resistor and the voltage input by the reference voltage circuit respectively, the Schottky diode is connected in parallel at both ends of the resistor, and two capacitors connected in series are also connected in parallel to the two wirings of the comparator, and the two capacitors are grounded.

5. The vehicle-mounted backup power response system as claimed in claim 4, characterized in that: The resistance value of the resistor is 1M ohm, and the capacitance value is 470pF.

6. The vehicle-mounted backup power response system as claimed in claim 1, characterized in that: The control circuit comprises a microcontroller chip MCU, resistors and capacitors. The MCU receives a signal from a voltage sampling circuit, performs digital-to-analog conversion, and outputs an action command to the drive circuit.

7. The vehicle-mounted backup power response system as claimed in claim 1, characterized in that: The undervoltage detection circuit monitors whether the real-time voltage of the vehicle power supply is lower than the set voltage of the vehicle power supply through a combination of hardware, and adjusts its own voltage output.

8. The vehicle-mounted backup power response system as claimed in claim 1, characterized in that: The driving circuit is provided with a one-time programmable memory, which notifies the switch circuit to turn on or off according to the input action command.

9. The vehicle-mounted backup power response system as claimed in claim 1, characterized in that: The switch circuit is provided with a MOS tube, and the MOS tube switches the on-off state according to the current of the driving circuit.

10. A method for quickly switching on a vehicle-mounted backup power supply, characterized in that: A response system for a vehicle-mounted backup power supply according to any one of claims 1 to 9 is used and the following steps are performed: Step 1: The undervoltage monitoring circuit monitors whether the real-time voltage of the vehicle power supply is lower than the set voltage. If so, the voltage of the input delay circuit is changed and the process goes to step 2. Otherwise, no action is taken and the real-time voltage of the vehicle power supply continues to be monitored. Step 2: The voltage of the undervoltage monitoring circuit is different from the voltage generated by the reference voltage circuit after passing through the RC circuit in the delay circuit, and the delay circuit outputs an analog control signal to the drive circuit; Step 3: The driving circuit converts the analog control signal into a digital control signal and controls the switch circuit to close, thereby connecting the battery pack to the vehicle power supply, and the battery pack supplies power to the load connected to the vehicle power supply; Step 4: The voltage sampling circuit monitors whether the vehicle power supply voltage returns to the set voltage and sends a signal to the control circuit; Step 5: The control circuit confirms whether to keep the switch circuit closed according to the signal. If yes, the battery pack continues to supply power to the load connected to the vehicle power supply. Otherwise, it goes to step 6. Step 6: The control switch circuit is disconnected, the battery pack is disconnected from the vehicle power supply, the vehicle power supply directly supplies power to the connected load, and the vehicle power supply charges the battery pack through the charging circuit.

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