A vehicle-mounted zero quiescent current delayed power-down circuit

Abstract

This utility model discloses an on-board zero static current delayed power-off circuit, including an ignition control module, a power supply module, and a time delay relay. Both the ignition control module and the power supply module are electrically connected to the time delay relay. The time delay relay includes an IN terminal, a V+ terminal, a GND terminal, a COM terminal, an NC terminal, and a NO terminal. The ignition control module is electrically connected to both the IN and V+ terminals, the power supply module is electrically connected to the COM terminal, the NO terminal is electrically connected to the V+ terminal, and the GND terminal is grounded. In this utility model, when the vehicle is turned off, the ignition control module loses power, creating a low potential. The time delay relay continues to operate, maintaining a high level output at the NO terminal. After a delay, the relay disconnects, and both the NO and V+ terminals output 0V, completely disconnecting the power supply module from the V+ terminal. With zero static current, this prevents battery drain and extends battery life.

Description

Technical Field

[0001] This utility model relates to a vehicle-mounted zero static current delayed power-off circuit. Background Technology

[0002] The vehicle is equipped with a forward-facing camera module, an industrial control computer, and a WiFi module. After the vehicle starts, it communicates with the vehicle body and reads radar messages to control the vehicle and provide warnings. When the vehicle is turned off, the industrial control computer needs a delayed power-off period; otherwise, its internal solid-state drive could be damaged.

[0003] Therefore, a delayed power-off circuit is usually designed, and a time-delay relay is added to the circuit. Typically, a time-delay relay includes an IN terminal, a V+ terminal, a GND terminal, a COM terminal, an NC terminal, and a NO terminal. The IN terminal is used to receive the start signal and trigger the delay action. The V+ terminal is connected to the positive terminal of the power supply, the GND terminal is connected to the negative terminal of the power supply or ground, and the COM terminal is the common contact of the internal switch of the relay. When the relay is not activated (not energized or not triggered), the COM terminal is connected to the NC terminal. After activation, it is disconnected and connected to the NO terminal.

[0004] Its working principle is as follows: When the VBAT of the original vehicle wiring harness is connected to the V+ and COM of the time delay relay, the IGN (ignition signal) of the original vehicle wiring harness is connected to the IN terminal of the time delay relay, and the GND (ground) of the original vehicle wiring harness is connected to the GND terminal of the time delay relay (e.g., Figure 1 (As shown).

[0005] When the vehicle is powered on, the IGN high potential triggers the relay, and VBAT supplies power to the external industrial control computer and the vehicle-mounted Ethernet converter through the COM to NO terminals. Simultaneously, VBAT supplies power to the voltage regulator chip through the V+ terminal, and then to the WIFI module.

[0006] When the vehicle is turned off, the IGN power is lost, creating a low potential. The time-delay relay continues to operate, and the NO terminal output remains high. After a delay circuit (0-30 seconds, 0-300 seconds, or minutes selectable), the relay disconnects after the delay time is reached, and there is no output at the NO terminal.

[0007] Since the V+ terminal is always connected to the vehicle's battery VBAT, the static current is 30mA, which will cause the battery to run out of power over time. Utility Model Content

[0008] The purpose of this invention is to provide an on-board zero static current delayed power-down circuit to solve the technical problems mentioned in the background section.

[0009] The technical solution to achieve the purpose of this utility model is: an on-board zero static current delayed power-off circuit, including an ignition control module, a power supply module, and a time delay relay. The ignition control module and the power supply module are both electrically connected to the time delay relay. The time delay relay includes an IN terminal, a V+ terminal, a GND terminal, a COM terminal, an NC terminal, and a NO terminal. The ignition control module is electrically connected to both the IN terminal and the V+ terminal. The power supply module is electrically connected to the COM terminal. The NO terminal and the V+ terminal are electrically connected through an external line. The GND terminal is grounded.

[0010] Furthermore, a diode is provided between the ignition control module and the V+ terminal.

[0011] Furthermore, a diode is disposed between the NO terminal and the V+ terminal.

[0012] Furthermore, the time-delay relay is a 24V time-delay relay.

[0013] Furthermore, it also includes an industrial control computer and an in-vehicle Ethernet converter. The NO terminal of the delay relay is electrically connected to the input terminal of the industrial control computer, and the NO terminal of the delay relay is electrically connected to the input terminal of the in-vehicle Ethernet converter.

[0014] By adopting the above technical solution, this utility model has the following beneficial effects:

[0015] (1) In this utility model, when the vehicle is turned off, the ignition control module loses power and forms a low potential. The time delay relay continues to work, and the NO terminal output maintains a high level. After the delay time, the relay is disconnected, the NO terminal output is 0V, and the V+ terminal is also 0V. This can completely disconnect the power module and the V+ terminal. The static current is 0, which can prevent the battery from running out of power and extend its service life.

[0016] (2) This utility model has a diode between the ignition control module and the V+ terminal, which only allows the ignition signal to supply power to the V+ terminal, blocks the reverse current path, prevents power backflow, and protects the ignition control module.

[0017] (3) This utility model provides a diode between the NO terminal and the V+ terminal to prevent the external power supply at the V+ terminal from flowing back into the load side. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0019] Figure 1 This is a circuit diagram of a relay in the prior art.

[0020] Figure 2 This is a schematic diagram showing the change of current at each terminal of a relay over time in the prior art.

[0021] Figure 3 This is the circuit diagram of the relay of this utility model.

[0022] Figure 4 This is a schematic diagram showing the change of current at each terminal of the relay of this utility model over time. Detailed Implementation

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of the embodiments of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this utility model and should not be used to limit the scope of protection of this utility model.

[0029] (Example 1)

[0030] See Figure 1 The vehicle-mounted zero static current delayed power-down circuit of this embodiment includes an ignition control module (IGN), a power supply module (VBAT), and a time delay relay. Both the ignition control module and the power supply module are electrically connected to the time delay relay. The time delay relay includes an IN terminal, a V+ terminal, a GND terminal, a COM terminal, an NC terminal, and a NO terminal. The ignition control module is electrically connected to both the IN terminal and the V+ terminal, the power supply module is electrically connected to the COM terminal, the NO terminal is electrically connected to the V+ terminal through an external line, and the GND terminal is grounded.

[0031] Specifically, in this embodiment, the ignition control module is electrically connected to both the IN and V+ terminals, the power supply module is electrically connected to the COM terminal, the NO terminal is electrically connected to the V+ terminal via an external line, and the GND terminal is grounded. When the vehicle is powered on, the ignition control module outputs a high potential, providing voltage to the IN and V+ terminals of the time delay relay, causing the relay to energize. The power supply module then provides voltage to the V+ terminal of the time delay relay via the COM terminal to the NO terminal.

[0032] In this invention, when the vehicle is turned off, the ignition control module loses power and forms a low potential. The time-delay relay continues to work, and the NO terminal output remains at a high level. After the delay time, the relay disconnects, the NO terminal outputs 0V, and the V+ terminal also outputs 0V. This completely disconnects the power module from the V+ terminal, resulting in zero static current. This prevents the battery from running out of power and extends its service life.

[0033] In this embodiment, a diode is installed between the ignition control module and the V+ terminal to allow only the ignition signal to supply power to the V+ terminal, blocking the reverse current path, preventing power backflow, and protecting the ignition control module. A diode is also installed between the NO terminal and the V+ terminal to prevent external power from flowing back into the load side from the V+ terminal. In this embodiment, the time delay relay is a 24V time delay relay.

[0034] It also includes an industrial control computer and an in-vehicle Ethernet converter. The NO terminal of the delay relay is electrically connected to the input terminal of the industrial control computer, and the NO terminal of the delay relay is electrically connected to the input terminal of the in-vehicle Ethernet converter. By adding the delay relay of this embodiment to the front end of the industrial control computer and the in-vehicle Ethernet converter, power outages can be delayed to prevent component damage, and battery drain can be prevented, thus extending the service life.

[0035] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vehicle-mounted zero quiescent current delayed power-down circuit, characterized in that: The device includes an ignition control module, a power supply module, and a time delay relay. Both the ignition control module and the power supply module are electrically connected to the time delay relay. The time delay relay includes an IN terminal, a V+ terminal, a GND terminal, a COM terminal, an NC terminal, and a NO terminal. The ignition control module is electrically connected to both the IN terminal and the V+ terminal. The power supply module is electrically connected to the COM terminal. The NO terminal is electrically connected to the V+ terminal through an external line. The GND terminal is grounded.

2. The vehicle-mounted zero static current delay power-down circuit according to claim 1, characterized in that: A diode is installed between the ignition control module and the V+ terminal.

3. The vehicle-mounted zero static current delay power-down circuit according to claim 1, characterized in that: A diode is disposed between the NO terminal and the V+ terminal.

4. The vehicle-mounted zero static current delay power-down circuit according to claim 1, characterized in that: The time delay relay is a 24V time delay relay.

5. The vehicle-mounted zero static current delay power-down circuit according to claim 1, characterized in that: It also includes an industrial control computer and an in-vehicle Ethernet converter. The NO terminal of the time delay relay is electrically connected to the input terminal of the industrial control computer, and the NO terminal of the time delay relay is electrically connected to the input terminal of the in-vehicle Ethernet converter.

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