Vehicle-mounted emergency power supply circuit
Patent Information
- Application Number
- CN202522271915.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-28
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-10-28
AI Technical Summary
[0003]然而，当机动车的车载电池或供电电路发生供电异常（比如，因车辆发生严重碰撞导致车载电池或供电电路故障，或者车载电池电量耗尽未能及时得以充电恢复）时，很容易引发某些车载功能模块无法保持正常工作，致使车辆以及车上乘员的安全性无法得以保障
[0012]采用上述技术方案后，本实用新型实施例至少具有如下有益效果：本实用新型实施例车载应急供电电路包括MOS管Q1、三极管Q2和储电元件，当车载电池VCC正常供电时，三极管Q2正常导通进而使MOS管Q1断开，车载应急供电电路不对外部的车载功能模块，而是对储电元件进行充电；当机动车发生事故导致车载电池VCC出现开路或短路时，三极管Q2断开进而促使MOS管Q1导通，此时储电元件通过MOS管Q1放电对外部的车载功能模块3进行应急供电，保证车载功能模块的应急工作。
Smart Images
Figure CN224746321U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle power supply circuit technology, and in particular to a vehicle emergency power supply circuit. Background Technology
[0002] Currently, vehicle-mounted functional modules such as electronic door handles and electronic braking modules are typically powered by onboard batteries, making a continuous and stable power supply particularly important.
[0003] However, when the vehicle's onboard battery or power supply circuit experiences a power supply abnormality (for example, due to a serious collision causing a failure in the onboard battery or power supply circuit, or the onboard battery being depleted and unable to be recharged in time), it can easily cause certain onboard functional modules to malfunction, thus compromising the safety of the vehicle and its occupants.
[0004] Taking automotive electronic door handles as an example, when the power supply is abnormal, the door handle will not pop out normally, the door cannot be opened, and occupants may be trapped inside the vehicle, seriously hindering rescue efforts at accident scenes and potentially resulting in fatalities, posing a clear safety hazard. Furthermore, in-vehicle functional modules such as ultrasonic radar modules and forward-facing integrated cameras will fail the moment power is interrupted, easily leading to data loss and hindering the reconstruction of the accident scene. Electronic brake pads, when de-energized, can also easily cause secondary injuries.
[0005] To address this, the industry has also developed an emergency power supply circuit to provide emergency power to various onboard functional modules of motor vehicles that are related to vehicle and passenger safety. However, existing emergency power supply circuits all suffer from complex circuit structures. Utility Model Content
[0006] The technical problem to be solved by this utility model embodiment is to provide an on-board emergency power supply circuit with a simple circuit structure, which can provide emergency power supply to relevant on-board functional modules when the vehicle's conventional power supply system fails.
[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a vehicle-mounted emergency power supply circuit, including a MOSFET Q1, a transistor Q2, and an energy storage element, wherein: The input, control, and output terminals of the MOSFET Q1 are connected to the energy storage element, the positive terminal of the vehicle battery VCC, and the vehicle functional module respectively. The input and control terminals of the MOSFET Q1 are also connected through a diode D that conducts unidirectionally from the control terminal to the input terminal. The input, output, and control terminals of transistor Q2 are respectively connected to the control terminal of MOSFET Q1, the positive terminal of vehicle battery VCC, and one end of first resistor R1. The other end of first resistor R1 is connected to the input terminal of transistor Q2. The output terminal of transistor Q2 is also connected to the negative terminal of vehicle battery VCC and ground terminal through second resistor R2.
[0008] Furthermore, the energy storage element is a capacitor C with one end connected to the input terminal of the MOS transistor Q1 and the other end connected to the ground terminal.
[0009] Furthermore, a third resistor R3 is connected in parallel across the two ends of the capacitor C.
[0010] Furthermore, the MOS transistor Q1 is a P-MOS transistor, and the transistor Q2 is an NPN transistor.
[0011] Furthermore, the vehicle-mounted emergency power supply circuit is located adjacent to the vehicle-mounted functional module.
[0012] After adopting the above technical solution, the present utility model embodiment has at least the following beneficial effects: The vehicle emergency power supply circuit of the present utility model embodiment includes a MOSFET Q1, a transistor Q2 and a storage element. When the vehicle battery VCC is normally powered, the transistor Q2 is normally turned on, thereby causing the MOSFET Q1 to turn off. The vehicle emergency power supply circuit does not charge the external vehicle functional module, but charges the storage element. When a motor vehicle accident causes the vehicle battery VCC to open or short-circuit, the transistor Q2 turns off, thereby causing the MOSFET Q1 to turn on. At this time, the storage element discharges through the MOSFET Q1 to provide emergency power to the external vehicle functional module 3, ensuring the emergency operation of the vehicle functional module. Attached Figure Description
[0013] Figure 1 This is a circuit diagram of an optional embodiment of the vehicle-mounted emergency work device of this utility model. Detailed Implementation
[0014] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present utility model and are not intended to limit the present utility model. Moreover, the embodiments and features in the embodiments of the present application can be combined with each other unless otherwise specified.
[0015] like Figure 1 As shown, an optional embodiment of this utility model provides a vehicle-mounted emergency power supply circuit 1, including a MOSFET Q1, a transistor Q2, and an energy storage element, wherein: The input, control, and output terminals of the MOSFET Q1 are respectively connected to the energy storage element, the positive terminal of the vehicle battery VCC, and the vehicle functional module 3. The input and control terminals of the MOSFET Q1 are also connected through a diode D that conducts unidirectionally from the control terminal to the input terminal. The input, output, and control terminals of transistor Q2 are respectively connected to the control terminal of MOSFET Q1, the positive terminal of vehicle battery VCC, and one end of first resistor R1. The other end of first resistor R1 is connected to the input terminal of transistor Q2. The output terminal of transistor Q2 is also connected to the negative terminal of vehicle battery VCC and ground terminal through second resistor R2.
[0016] This utility model embodiment of the vehicle emergency power supply circuit 1 includes a MOSFET Q1, a transistor Q2, and a storage element. When the vehicle battery VCC is supplying power normally, transistor Q2 conducts normally, causing MOSFET Q1 to turn off. The vehicle emergency power supply circuit 1 does not charge the external vehicle functional module 3, but instead charges the storage element. When a vehicle accident causes an open circuit or short circuit in the vehicle battery VCC, transistor Q2 turns off, causing MOSFET Q1 to conduct. At this time, the storage element discharges through MOSFET Q1 to provide emergency power to the external vehicle functional module 3, ensuring the emergency operation of the vehicle functional module 3. The vehicle emergency power supply circuit 1 provided by this utility model has a very simple circuit structure and low cost. In specific implementation, each vehicle functional module 3 (especially those vehicle functional modules that play an important role in ensuring the safety of the vehicle and passengers) can be provided with a separate vehicle emergency power supply circuit 1 at low cost, ensuring that these vehicle functional modules can still work normally for a period of time when the normal power supply system is abnormal.
[0017] In specific implementation, the vehicle-mounted emergency power supply circuit 1 in this embodiment only provides emergency power. When the vehicle-mounted battery VCC is normal, the vehicle-mounted battery VCC can directly power the vehicle-mounted functional module 3. Furthermore, the vehicle-mounted functional module 3 can be at least one of the following modules: an electronic door handle pop-up drive module, an electronic brake braking module, an ultrasonic radar module, and a forward-looking camera module. Correspondingly, in the event of a vehicle-mounted battery VCC failure, the system automatically pops up the electronic door handle, maintains normal braking of the electronic brake calipers, performs emergency obstacle detection alarms and data storage for the vehicle-mounted radar, and records emergency video and data storage for the vehicle-mounted forward-looking system.
[0018] In one optional embodiment of this utility model, such as Figure 1As shown, the energy storage element is a capacitor C, with one end connected to the input terminal of the MOSFET Q1 and the other end connected to ground. In this embodiment, the energy storage element is a capacitor C. The charging and discharging of capacitor C can effectively provide emergency power supply in case of a VCC failure in the vehicle battery, and the circuit structure is simple. In specific implementations, the capacitor C can be a large-capacity (e.g., 330μF) electrolytic capacitor; of course, other forms of energy storage elements can also be used, such as lithium batteries or other battery elements.
[0019] In one optional embodiment of this utility model, such as Figure 1 As shown, a third resistor R3 is connected in parallel across the capacitor C. In this embodiment, by setting the third resistor R3 in parallel with the capacitor C, an RC filter circuit is formed, which effectively filters out interference signals in the circuit and improves the stability of the circuit.
[0020] In one optional embodiment of this utility model, such as Figure 1 As shown, the MOSFET Q1 is a P-MOS transistor, and the transistor Q2 is an NPN transistor. In this embodiment, the MOSFET Q1 and transistor Q2 are respectively adopted as the above-mentioned types of devices, which have good controllability, and the power consumption of the P-MOS transistor and the NPN transistor is very low when they are turned on, so that the energy storage element can supply power to the vehicle functional module 3 as much as possible when discharging. Specifically, as shown... Figure 1 In the diagram, MOSFET Q1 is a PMOS transistor, with its input, output, and control terminals corresponding to the source, drain, and gate, respectively; transistor Q2 is an NPN transistor, with its input, output, and control terminals corresponding to the collector, emitter, and base, respectively.
[0021] In an optional embodiment of this utility model, the vehicle-mounted emergency power supply circuit 1 is disposed adjacent to the vehicle-mounted functional module 3. In this embodiment, the vehicle-mounted emergency power supply circuit 1 and the vehicle-mounted functional module 3 are disposed adjacently to minimize the risk of damage to the wiring between the vehicle-mounted emergency power supply circuit 1 and the vehicle-mounted functional module 3 during a vehicle collision, thus ensuring emergency power supply. Specifically, the vehicle-mounted emergency power supply circuit 1 can be integrated into the power input port of the vehicle-mounted functional module 3.
[0022] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the scope of protection of the present invention.
Claims
1. An in-vehicle emergency power supply circuit characterized by comprising: The vehicle-mounted emergency power supply circuit includes a MOSFET Q1, a transistor Q2, and an energy storage element, wherein: The input, control, and output terminals of the MOSFET Q1 are connected to the energy storage element, the positive terminal of the vehicle battery VCC, and the vehicle functional module respectively. The input and control terminals of the MOSFET Q1 are also connected through a diode D that conducts unidirectionally from the control terminal to the input terminal. The input, output, and control terminals of transistor Q2 are respectively connected to the control terminal of MOSFET Q1, the positive terminal of vehicle battery VCC, and one end of first resistor R1. The other end of first resistor R1 is connected to the input terminal of transistor Q2. The output terminal of transistor Q2 is also connected to the negative terminal of vehicle battery VCC and ground terminal through second resistor R2.
2. The vehicle-mounted emergency power supply circuit as described in claim 1, characterized in that, The energy storage element is a capacitor C with one end connected to the input terminal of the MOS transistor Q1 and the other end connected to the ground terminal.
3. The vehicle-mounted emergency power supply circuit as described in claim 2, characterized in that, A third resistor R3 is connected in parallel across the two ends of the capacitor C.
4. The vehicle-mounted emergency power supply circuit as described in claim 1, characterized in that, The MOSFET Q1 is a P-MOS transistor, and the transistor Q2 is an NPN transistor.
5. The vehicle-mounted emergency power supply circuit as described in claim 1, characterized in that, The vehicle-mounted emergency power supply circuit is located adjacent to the vehicle-mounted functional module.