Vehicle-mounted portable terminal power management system

Abstract

The utility model discloses a vehicle-mounted portable terminal power management system, and relates to the technical field of vehicle-mounted portable terminals. The vehicle-mounted portable terminal power supply management system comprises an external input power supply, a power supply management module and a power supply management module, the on-off control circuit is electrically connected with the external input power supply and at least one device; and the control signal generation circuit is electrically connected with the on-off control circuit. The utility model solves the following defects in the prior art: when a vehicle flames out, a cigarette lighter interface is immediately powered off, so that equipment is suddenly powered off, and for an embedded system (such as a Linux system), the power failure possibly causes data loss, file system damage and even memory hardware damage; and when the vehicle is started, the voltage of the cigarette lighter interface is instantaneously low, so that the equipment is restarted or is abnormal, and the normal operation of the equipment is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted portable terminals, and particularly to a power management system for a vehicle-mounted portable terminal. Background Art

[0002] A vehicle-mounted portable acquisition / operation terminal (hereinafter referred to as the device) usually obtains power from a vehicle through a cigarette lighter interface.

[0003] However, the prior art has the following deficiencies: when the vehicle is turned off, the cigarette lighter interface will immediately lose power, resulting in the device suddenly losing power. For an embedded system (such as a Linux system), power-off may cause data loss, file system damage, and even damage to the memory hardware; and when the vehicle is started, the voltage of the cigarette lighter interface will show an instantaneous low voltage, resulting in the device restarting or malfunctioning, affecting the normal operation of the device. For the above problems, no effective solution has been proposed yet. Summary of the Utility Model

[0004] Purpose of the utility model: To provide a power management system for a vehicle-mounted portable terminal to at least solve one of the problems existing in the above prior art.

[0005] Technical solution: A power management system for a vehicle-mounted portable terminal includes:

[0006] An external input power supply;

[0007] A switching control circuit electrically connected to the external input power supply and at least one device; and

[0008] A control signal generation circuit electrically connected to the switching control circuit;

[0009] Wherein, the state signal of the external input power supply is detected through the switching control circuit to output a power-on or power-off signal to the device.

[0010] Preferably, it further includes: a buck circuit, the buck circuit is electrically connected to one end of the external input power supply, and the buck circuit is used to reduce the vehicle 12V / 24V voltage to the battery charging voltage.

[0011] Preferably, it further includes: a boost circuit, the boost circuit is electrically connected to the other end of the external input power supply, and the boost circuit is used to boost the battery voltage to the device voltage.

[0012] Preferably, a battery circuit is provided between the buck circuit and the boost circuit, one end of the battery circuit is electrically connected to the output end of the buck circuit, and the other end of the battery circuit is electrically connected to the input end of the boost circuit.

[0013] Preferably, the external input power supply includes: input voltage VIN+, input voltage VIN-, output terminal VOUT+ and output terminal VOUT-.

[0014] Preferably, the on-off control circuit includes: a third optocoupler, the first pin of the third optocoupler is electrically connected to RUNNING+, the second pin of the third optocoupler is electrically connected to RUNNING- through a second resistor, the third pin of the third optocoupler is respectively connected to the negative electrode of the first diode, one end of the third resistor and the control end of the first switching tube, the first end of the first switching tube is connected to the output terminal VOUT-, and the second end of the first switching tube is connected to one end of the first resistor.

[0015] Preferably, the control signal generation circuit includes: a first capacitor, the first capacitor is arranged in parallel with the first resistor on the side away from the first switching tube, and the first capacitor outputs a power-on or power-off control signal to the device through a charging or discharging process to control the device to perform corresponding operations.

[0016] Preferably, the positive electrode of the first capacitor is respectively connected to the second pin of the first optocoupler and the second pin of the second optocoupler, the second pin of the first optocoupler is connected to the first pin of the second optocoupler, and the first pin of the first optocoupler is connected to one end of the first resistor through a second resistor.

[0017] Preferably, the third pin of the first optocoupler is connected to the second enable signal, and the fourth pin of the first optocoupler is connected to the first enable signal.

[0018] Preferably, the third pin of the second optocoupler is connected to the second shutdown signal, and the fourth pin of the second optocoupler is connected to the first shutdown signal.

[0019] Beneficial effects: In the embodiment of the present application, by adding an on-off control circuit, the on-off control circuit detects the status signal of the external input power supply to output a power-on or power-off signal to the device, achieving the purpose of accurate input power detection, thereby realizing the technical effects of ensuring the power supply stability of the device with low cost and small volume and the normal shutdown of the device after the vehicle is powered off, and further solving the following deficiencies in the prior art: when the vehicle shuts off, the cigarette lighter interface will immediately lose power, causing the device to suddenly lose power. For an embedded system (such as a Linux system), power-off may cause data loss, file system damage, and even damage to the memory hardware; and when the vehicle starts, the voltage of the cigarette lighter interface will have an instantaneous low voltage, causing the device to restart or malfunction, affecting the normal operation of the device. Description of the Drawings

[0020] Figure 1It is a schematic structural diagram of the in-vehicle portable terminal power management system of the present utility model; and

[0021] Figure 2 It is an electrical schematic diagram of the in-vehicle portable terminal power management system of the present utility model.

[0022] The reference numerals are as follows:

[0023] 10. External input power supply;

[0024] 20. On-off control circuit;

[0025] 30. Control signal generation circuit;

[0026] 40. Device;

[0027] 50. Step-down circuit;

[0028] 60. Boost circuit;

[0029] 70. Battery circuit. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] In addition, the terms "installed", "set up", "equipped with", "connected", "linked", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0034] This application relates to a vehicle-mounted portable terminal power management system. As Figure 1-2 shown, this vehicle-mounted portable terminal power management system includes: an external input power supply 10; which can achieve a good external power input effect, thereby ensuring a good power supply effect.

[0035] An on-off control circuit 20, electrically connected to the external input power supply 10 and at least one device 40; intelligently manages power supply according to the combined conditions of the input power supply and the operating state of the device 40; when the external power supply is turned on or the device 40 is running, the device 40 maintains a powered state; when the vehicle power supply is turned off and the device 40 is in a shutdown state, the device 40 is powered off to avoid power consumption.

[0036] A control signal generation circuit 30, electrically connected to the on-off control circuit 20; when the external power supply is powered on and off, using the charging / discharging process of the capacitor C1, outputs an on / off control signal to the device 40 to enable the device 40 to perform on and off operations.

[0037] Wherein, the on-off control circuit 20 detects the status signal of the external input power supply 10 to output a turn-on or turn-off signal to the device 40.

[0038] Specifically, when the external power supply is turned on, the on-off control circuit 20 is turned on and outputs a turn-on signal to the device 40; when the external power supply is turned off, it outputs a turn-off signal to the device 40, and after the device 40 has completed shutdown, the power supply to the device 40 is disconnected.

[0039] This application can sense the on and off of the input power supply while taking power, output a turn-on signal to the device 40 when the input power supply is turned on; output a turn-off signal to the device 40 when the input power supply is turned off, and then disconnect the power supply of the device 40 after the device 40 has completed shutdown, thereby not only ensuring the safety and information integrity of the device 40, but also not consuming power after shutdown.

[0040] As can be seen from the above description, the present application achieves the following technical effects:

[0041] In the embodiment of the present application, by adding a switching control circuit 20, the state signal of the external input power supply 10 is detected through the switching control circuit 20 to output a power-on or power-off signal to the device 40, achieving the purpose of accurate input power supply detection. Thus, the technical effects of ensuring the power supply stability of the device 40 with low cost and small volume and the normal shutdown of the device 40 after the vehicle is powered off are realized. Furthermore, the following deficiencies in the prior art are solved: when the vehicle shuts off, the cigarette lighter socket will be powered off immediately, causing the device 40 to suddenly lose power. For an embedded system (such as a Linux system), power-off may cause data loss, file system damage, and even damage to the memory hardware; and when the vehicle starts, the voltage of the cigarette lighter socket will have an instantaneous low voltage, causing the device 40 to restart or malfunction, affecting the normal operation of the device 40.

[0042] Furthermore, it further includes: a buck circuit 50, the buck circuit 50 is electrically connected to one end of the external input power supply 10, and the buck circuit 50 is used to reduce the vehicle 12V / 24V voltage to the battery charging voltage. It can be understood that this functional area can ensure that the device 40 obtains a stable low-voltage power supply and adapts to the power supply requirements of different vehicle models.

[0043] Furthermore, it further includes: a boost circuit 60, the boost circuit 60 is electrically connected to the other end of the external input power supply 10, and the boost circuit 60 is used to boost the battery voltage to the device 40 voltage. It can be understood that when the vehicle power supply is disconnected, the boost circuit 60 obtains electrical energy from the battery and boosts the battery voltage to the working voltage required by the device 40 to ensure that the device 40 can operate normally during the shutdown process.

[0044] Furthermore, a battery circuit 70 is provided between the buck circuit 50 and the boost circuit 60. One end of the battery circuit 70 is electrically connected to the output end of the buck circuit 50, and the other end of the battery circuit 70 is electrically connected to the input end of the boost circuit 60. It can be understood that when the vehicle shuts off, the battery provides short-term power for the shutdown operation of the device 40 to ensure that the device 40 can complete the shutdown process smoothly; this battery only consumes a small amount of power during the shutdown process, and after the device 40 is completely shut down, the system cuts off the battery power supply to avoid excessive power consumption.

[0045] Furthermore, the external input power supply 10 includes: an input voltage VIN+, an input voltage VIN-, an output terminal VOUT+ and an output terminal VOUT-. It can be understood that good electrical connection effects can be achieved.

[0046] Further, the on-off control circuit 20 includes: a third optocoupler U3. The first pin of the third optocoupler U3 is electrically connected to RUNNING+. The second pin of the third optocoupler U3 is electrically connected to RUNNING- through a second resistor R2. The third pin of the third optocoupler U3 is respectively connected to the negative electrode of a first diode D1, one end of a third resistor R3, and the control end of a first switching transistor Q1. The first end of the first switching transistor Q1 is connected to the output terminal VOUT-, and the second end of the first switching transistor Q1 is connected to one end of a first resistor R1.

[0047] Further, the control signal generation circuit 30 includes: a first capacitor C1. The first capacitor C1 is arranged in parallel with the first resistor R1 on the side away from the first switching transistor Q1. The first capacitor C1 outputs a power-on or power-off control signal to the device 40 through a charging or discharging process to control the device 40 to perform corresponding operations. It can be understood that the on-off signal is generated through the charging / discharging process of the first capacitor C1; when the external power supply is connected, the capacitor charges to generate a power-on signal; when the external power supply is disconnected, the capacitor discharges to generate a power-off signal; it can ensure that the device 40 can shut down orderly when the flame goes out, avoiding system crashes caused by sudden power outages.

[0048] Further, the positive electrode of the first capacitor C1 is respectively connected to the second pin of a first optocoupler U1 and the second pin of a second optocoupler U2. The second pin of the first optocoupler U1 is connected to the first pin of the second optocoupler U2. The first pin of the first optocoupler U1 is connected to one end of the first resistor R1 through the second resistor R2. It can be understood that a good on-off control effect can be achieved.

[0049] Further, the third pin of the first optocoupler U1 is connected to a second enable signal, and the fourth pin of the first optocoupler U1 is connected to a first enable signal. It can be understood that an accurate enabling effect can be achieved.

[0050] Further, the third pin of the second optocoupler U2 is connected to a second disable signal, and the fourth pin of the second optocoupler U2 is connected to a first disable signal. It can be understood that an accurate disabling effect can be achieved.

[0051] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A vehicle-mounted portable terminal power management system, characterized in that, Comprising: External input power supply; On-off control circuit, electrically connected to the external input power supply and at least one device; And Control signal generation circuit, electrically connected to the on-off control circuit; Wherein, the on-off control circuit detects the status signal of the external input power supply to output a power-on or power-off signal to the device.

2. The in-vehicle portable terminal power management system according to claim 1, wherein, Further comprising: Step-down circuit, the step-down circuit is electrically connected to one end of the external input power supply, and the step-down circuit is used to step down the vehicle 12V / 24V voltage to the battery charging voltage.

3. The in-vehicle portable terminal power management system according to claim 2, wherein Further comprising: Boost circuit, the boost circuit is electrically connected to the other end of the external input power supply, and the boost circuit is used to boost the battery voltage to the device voltage.

4. The in-vehicle portable terminal power management system according to claim 3, characterized in that, A battery circuit is provided between the step-down circuit and the boost circuit, one end of the battery circuit is electrically connected to the output end of the step-down circuit, and the other end of the battery circuit is electrically connected to the input end of the boost circuit.

5. The in-vehicle portable terminal power management system according to claim 1, characterized in that The external input power supply includes: input voltage VIN+, input voltage VIN-, output terminal VOUT+ and output terminal VOUT-.

6. The in-vehicle portable terminal power management system according to claim 5, wherein The on-off control circuit includes: a third optocoupler, the first pin of the third optocoupler is electrically connected to RUNNING+, the second pin of the third optocoupler is electrically connected to RUNNING- through a second resistor, the third pin of the third optocoupler is respectively connected to the negative electrode of the first diode, one end of the third resistor and the control end of the first switch tube, the first end of the first switch tube is connected to the output terminal VOUT-, and the second end of the first switch tube is connected to one end of the first resistor.

7. The in-vehicle portable terminal power management system according to claim 6, wherein, The control signal generation circuit includes: a first capacitor, the first capacitor is arranged in parallel with the first resistor on the side away from the first switch tube, and the first capacitor outputs a power-on or power-off control signal to the device through a charging or discharging process to control the device to perform corresponding operations.

8. The in-vehicle portable terminal power management system according to claim 7, characterized in that, The positive electrode of the first capacitor is respectively connected to the second pin of the first optocoupler and the second pin of the second optocoupler, the second pin of the first optocoupler is connected to the first pin of the second optocoupler, and the first pin of the first optocoupler is connected to one end of the first resistor through a second resistor.

9. The in-vehicle portable terminal power management system according to claim 8, wherein, The third pin of the first optocoupler is connected to the second enable signal, and the fourth pin of the first optocoupler is connected to the first enable signal.

10. The in-vehicle portable terminal power management system according to claim 8, characterized in that, The third pin of the second optocoupler is connected to the second shutdown signal, and the fourth pin of the second optocoupler is connected to the first shutdown signal.

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