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A wide-voltage power supply protection device for an intelligent vehicle terminal

An on-board terminal and power protection technology, applied in the protection of undervoltage or no-voltage, emergency protection circuit devices, and overvoltage protection, etc. Narrow, single low-voltage shutdown sleep processing and other issues, to achieve the effect of a wide range of protection voltages, a wide range of applications, and a wide range of

Active Publication Date: 2011-12-07
HITACHI BUILDING TECH GUANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the traditional power management and protection methods of vehicle terminals are usually a single low-voltage shutdown sleep process; most of them cannot perform low-voltage and high-voltage protection at the same time, or the protected voltage range is narrow

Method used

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  • A wide-voltage power supply protection device for an intelligent vehicle terminal
  • A wide-voltage power supply protection device for an intelligent vehicle terminal
  • A wide-voltage power supply protection device for an intelligent vehicle terminal

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: The wide-voltage power supply protection device of the intelligent vehicle-mounted terminal provided by the present invention implements dual monitoring and protection for the power supply in a wide voltage range. The wide-voltage power supply protection device of the vehicle terminal is connected between the vehicle terminal and the car battery, including a precise reference voltage unit and undervoltage and overvoltage protection circuits.

[0015] This device provides the undervoltage comparison reference voltage through the precise reference voltage unit, and compares the divided voltage of the output voltage of the car battery with the undervoltage comparison reference voltage, and sends the output of the comparison result to the undervoltage and overvoltage protection unit. The voltage and overvoltage protection unit controls the on-off connection between the vehicle terminal and the car battery in the undervoltage state according to the comparison re...

Embodiment 2

[0017] Example 2: figure 2 It is an application example of embodiment 1 in the vehicle-mounted terminal system, such as figure 2 As shown, the under-voltage and over-voltage protection circuit Y3 includes a low-voltage acquisition and comparison unit, a high-voltage acquisition and comparison unit, a first-stage power control unit, and a second-stage power control unit. external power input, that is figure 2 Y1 in the middle is the car battery unit, which generally has output specifications such as DC12V, DC24V or DC36V; as an example, before the external power input enters the device, it first passes through the pre-stage protection and filter unit, and its function is to prevent power reverse connection function, Surge absorbing function, filtering, etc., namely figure 2 Middle anti-reverse connection and filter unit Y2; Y4 in the figure is the DC / DC filter unit, which allocates the power supply of each channel required by the vehicle terminal system; Y5 is the vehicle...

Embodiment 3

[0020] Example 3: image 3 It is an application example of the device in Embodiment 2. As shown in the figure, the precise reference voltage unit Q1 includes a first resistor R1, a sixth resistor R6, and a parallel three-terminal stabilizer connected in series between the input voltage Vin and the ground. Voltage reference source U1; the anode AN of U1 is grounded, the cathode CA is connected to R6, and the reference terminal REF is connected to the low-voltage acquisition unit; the capacitor E1 and the third Zener diode D3 and D3 are connected in parallel between the output terminal of the first resistor R1 and the ground The cathode of U1 is connected to R1, and the anode is grounded; the first capacitor C1 is connected to the cathode CA of U1 and the reference terminal REF.

[0021] The low-voltage acquisition and comparison unit includes a fifth resistor R5 and an eighth resistor R8 serially connected between the input voltage and ground; the reference terminal of U1 is co...

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Abstract

The invention provides a wide-voltage power protection device of an intelligent vehicle-mounted terminal, and the device is connected between a vehicle-mounted terminal and a car battery. The device comprises a precision reference voltage unit and an under-voltage and over-voltage protection circuit, wherein the precision reference voltage unit provides an under-voltage comparison reference voltage, compares a partial voltage of output voltage of the car battery with the under-voltage comparison reference voltage and sends the comparison result to an under-voltage and over-voltage protection circuit; and the under-voltage and over-voltage protection circuit provides a partial voltage of output voltage of the car battery, compares an input voltage of the vehicle-mounted terminal with a preset over-voltage shut-off threshold voltage and controls the on / off between the vehicle-mounted terminal and the car battery according to the comparison result of the under-voltage and over-voltage protection circuit or the comparison result of the precision reference voltage unit. The wide-voltage power protection device can achieve the effects of both low voltage protection and high voltage protection of power supply to the vehicle-mounted terminal, and has a wider voltage protection range.

Description

technical field [0001] The invention relates to a power supply protection device for a vehicle-mounted terminal, in particular to a wide-voltage power supply protection device for an intelligent vehicle-mounted terminal. Background technique [0002] With the development of the modern automobile industry, a large number of vehicle-mounted electronic devices are widely used in vehicles, such as vehicle-mounted satellite positioning monitoring systems, vehicle-mounted satellite navigation systems, vehicle-mounted audio-visual entertainment systems, body lighting systems, anti-theft systems, automatic air-conditioning systems, etc. All kinds of on-board electronic equipment need to have a stable power supply system if they want to work stably. The application environment of the vehicle power supply system is more complicated than that of the ordinary power supply system, because the electromagnetic environment in the car is relatively harsh. The electrical equipment of the car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18H02H3/20H02H3/24H02J9/06
Inventor 刘辉张永生文科郭伟文贾宇辉
Owner HITACHI BUILDING TECH GUANGZHOU CO LTD
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