CN102270831A - Wide-voltage power protection device of intelligent vehicle-mounted terminal - Google Patents

Wide-voltage power protection device of intelligent vehicle-mounted terminal Download PDF

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Publication number
CN102270831A
CN102270831A CN2011102099056A CN201110209905A CN102270831A CN 102270831 A CN102270831 A CN 102270831A CN 2011102099056 A CN2011102099056 A CN 2011102099056A CN 201110209905 A CN201110209905 A CN 201110209905A CN 102270831 A CN102270831 A CN 102270831A
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voltage
mounted terminal
resistance
car
unit
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CN2011102099056A
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CN102270831B (en
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刘辉
张永生
文科
郭伟文
贾宇辉
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Hitachi Building Technology Guangzhou Co Ltd
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Guangzhou Ropente Technology Development Co Ltd
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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

A kind of wide voltage source protective device of intelligent vehicle mounted terminal
Technical field
The present invention relates to the apparatus for protecting power supply of car-mounted terminal, relate in particular to a kind of wide voltage source protective device of intelligent vehicle mounted terminal.
Background technology
The Hyundai Motor industrial expansion makes a large amount of vehicle electronic devices be widely used in automobile, as vehicle-mounted satellite locating and monitoring system, vehicle-mounted satellite navigation system, vehicle-mounted video and music entertainment system, vehicle body illuminator, burglary-resisting system, automatic air-conditioning system etc.Various various vehicle electronic devices are wanted steady operation, need stable electric power system.The applied environment of Vehicular power system is than common power system complexity, because the electromagnetic environment in the automobile is comparatively abominable.The electric equipment of automobile the time can produce a large amount of electromagnetic interference in operation, worst situation often since vehicle self produce interference produced, as the disturbing pulse of ignition system, generator and rectifier systems.Most frequency bands that disturb are very wide, and the mode by conduction, coupling or radiation propagates in the power-supply system, and then has influence on the operate as normal of electronic equipment.
Car-mounted terminal is used on automobile, generally need be from the power taking of automobile electric power storage storage battery, and at present very big part car-mounted terminal does not have the overvoltage protection design of under voltage protection of thorough consideration storage battery and terminal itself.Traditional car-mounted terminal power management scheme; mostly be and only consider one; or the dormancy of terminal low pressure is closed; or use software control switch machine, dormancy; or use single active electrical source detection chip control switch machine, fail thorough under-voltage protection automobile storage battery and the high voltage protection car-mounted terminal considered.May cause the automobile storage battery can't the ignition trigger engine, perhaps because automotive ignition, other disturb and keep high voltage within a certain period of time so that damage car-mounted terminal because of consuming electric weight excessively.
What Fig. 1 described is the under-voltage protecting circuit of vehicle mobile terminals, and this circuit is single under-voltage protecting circuit device, and it mainly relies on voltage acquisition to judge with active integrated power supply chip and realizes, only under voltage is carried out monitoring and protection.
Therefore, traditional car-mounted terminal power management guard method, normally single low pressure is closed dormancy and is handled; Great majority can not carry out low pressure, high voltage protective simultaneously, and perhaps Bao Hu voltage range is narrow.
Summary of the invention
The invention provides a kind of wide voltage source protective device of intelligent vehicle mounted terminal, can be simultaneously the power supply of car-mounted terminal be carried out low pressure and high voltage protective, and the voltage range broad of protection.
The invention provides a kind of wide voltage source protective device of car-mounted terminal, be connected between car-mounted terminal and the automobile storage battery, comprising:
Precisely reference voltage unit is used to provide under-voltage comparison reference voltage, and the branch pressure voltage of the output voltage of more described automobile storage battery and described under-voltage comparison reference voltage, and sends to under-voltage comparative result and overvoltage crowbar;
Described under-voltage and overvoltage crowbar; be used to provide the branch pressure voltage of the output voltage of described automobile storage battery; and the input voltage of more described car-mounted terminal turn-offs threshold voltage with the overvoltage that sets in advance, according to comparative result or the comparative result control car-mounted terminal of described accurate reference voltage unit and the break-make of automobile storage battery of described under-voltage and overvoltage crowbar.
Thereby the present invention can reduce at the branch pressure voltage of the output voltage of described automobile storage battery and cut off car-mounted terminal when preestablishing under-voltage comparison reference voltage and prevent effectively that from the automobile storage battery power taking automobile storage battery is because of consuming the normal use that electric weight causes automotive ignition failure effect automobile excessively; Thereby this device has been realized also that the car-mounted terminal input voltage reaches to preestablish and is cut off car-mounted terminal when threshold voltage value is turn-offed in overvoltage and effectively avoided the infringement to car-mounted terminal itself of the high voltage of the certain hour that automotive ignition, other external disturbance or electric fault produce or high impulse from the automobile storage battery power taking simultaneously.The present invention implements car-mounted terminal power protection management method with characteristics such as " dual monitoring ", " non-restriction type ", " scope is wide ", " simple realization "; integrate under-voltage, overvoltage protection; preestablishing under-voltage overvoltage shutoff threshold value can be provided with according to actual needs; therefore protect voltage range wide; realize dual monitoring, contrive equipment has wide range of applications.
Description of drawings
Fig. 1 is the under-voltage protecting circuit of a kind of car-mounted terminal in the prior art;
Fig. 2 is the schematic diagram of the vehicle-mounted terminal system of embodiment 2;
Fig. 3 is the circuit diagram of the wide voltage source protective device of intelligent vehicle mounted terminal among the embodiment 3.
Embodiment
Embodiment 1: the wide voltage source protective device of intelligent vehicle mounted terminal provided by the invention, power supply is implemented the dual monitoring and protection of wide-voltage range.The wide voltage source protective device of this car-mounted terminal is connected between car-mounted terminal and the automobile storage battery, comprises accurate reference voltage unit and under-voltage and overvoltage crowbar.
This device provides under-voltage comparison reference voltage by accurate reference voltage unit, and the branch pressure voltage and the under-voltage comparison reference voltage of the output voltage of comparison automobile storage battery, and the result after will comparing output sends to under-voltage and Overvoltage protecting unit, under-voltage and Overvoltage protecting unit according to the comparative result control car-mounted terminal of accurate reference voltage unit when under-voltage condition and the break-make of automobile storage battery; Under-voltage and Overvoltage protecting unit turn-offs threshold voltage with the input voltage of car-mounted terminal and the overvoltage that is provided with in advance and compares in under-voltage and overvoltage crowbar, according to comparative result control car-mounted terminal when the overvoltage condition and the break-make of automobile storage battery.When the branch pressure voltage of the output voltage of described automobile storage battery is lower than under-voltage comparison reference voltage, cut off car-mounted terminal from the automobile storage battery power taking, protected automobile storage battery.When the car-mounted terminal input voltage surpass to be set overvoltage stop valve threshold voltage, cut off car-mounted terminal from the automobile storage battery power taking, under-voltage comparison reference voltage of the present invention and overvoltage are turn-offed threshold voltage and can be provided with as required, voltage that therefore can the broad amplitude range.When the automobile storage battery output voltage was returned to normal range (NR), other interference and fault eliminating, this device withdrawed from guard mode, recovered normal power supply and gave electricity, implemented intelligent monitoring.
This device both realized the low-voltage variation of automobile storage battery has also been realized high voltage protective to car-mounted terminal simultaneously, and the protection voltage range is wide, as an embodiment in 5V-100V all can, be applicable to 12V, 24V or the vehicle car-mounted terminal of multi-series type more.
Embodiment 2: Fig. 2 is the application example of embodiment 1 in vehicle-mounted terminal system; as shown in Figure 2, under-voltage and overvoltage crowbar Y3 comprises that low-voltage is gathered comparing unit, high voltage is gathered comparing unit, first order power control unit and second level power control unit.The external power source input, promptly Y1 is the automobile storage battery unit among Fig. 2, and specifications such as output DC12V, DC24V or DC36V are generally arranged; As an embodiment, externally the power supply input is protected and filter unit through prime earlier before entering into this device, and its effect is to prevent power supply reversal connection function, surge absorption function, filtering etc., i.e. anti-reverse and filter unit Y2 among Fig. 2; Y4 is the DC/DC filter unit among the figure, by needed each the path power supply of this unit allotment vehicle-mounted terminal system; Y5 is a car-mounted terminal, realizes every function of car-mounted terminal; In addition,, can comprise BAT1 stand-by power supply circuit unit, comprise reserve battery, after wide voltage source protective device under voltage protection function comes into force, can select whether to use this unit as a preferred embodiment.
The course of work of this device in vehicle-mounted terminal system is as follows: low-voltage is gathered comparing unit and is connected with automobile storage battery Y1 by anti-reverse and filter unit Y2, low pressure is gathered comparing unit and is adopted partial pressure type, the output voltage of gathering automobile storage battery Y1 is through the branch pressure voltage VC after the dividing potential drop, compare by accurate reference voltage, high voltage is gathered comparing unit and is connected with automobile storage battery Y1 by anti-reverse and filter unit Y2, gather the output voltage (being automobile terminal input voltage) of automobile storage battery, and finish comparing function, precisely reference voltage unit and high voltage are gathered comparing unit and respectively comparative result are outputed to first order mains switch control unit; First order power control unit is controlled the break-make of second level power control unit according to the output result of accurate reference voltage unit, high voltage collection comparing unit; Second level power control unit is connected with car-mounted terminal, and conducting or disconnection car-mounted terminal are connected with automobile storage battery.
In addition,, cut off car-mounted terminal, open reserve battery simultaneously,, guarantee that car-mounted terminal still can operate as normal a period of time as BAT1 unit among Fig. 4 from the automobile storage battery power taking as a preferred embodiment.
Embodiment 3: Fig. 3 is an application example of this device among the embodiment 2, and as shown in the figure, precisely reference voltage unit Q1 comprises first resistance R 1, the 6th resistance R 6 and the parallel connection type three-terminal voltage-stabilizing a reference source U1 that is connected on successively between input voltage vin and the ground; The anode A N ground connection of U1, negative electrode CA is connected with R6, and reference edge REF connects the low pressure collecting unit; Be parallel to the output of first resistance R 1 and the electric capacity E1 between the ground and the 3rd voltage stabilizing didoe D3; The negative electrode of D3 is connected with R1, plus earth; Be connected in first capacitor C 1 of negative electrode CA and the reference edge REF of U1.
Low-voltage is gathered comparing unit and is comprised the 5th resistance R 5 and the 8th resistance R 8 that is connected on successively between described input voltage and the ground; The reference edge of U1 is connected between the 5th resistance R 5 and the 6th resistance R 6;
High voltage is gathered comparing unit and is comprised second resistance R 2 and the first voltage stabilizing didoe D1 that is connected on successively between input voltage and the first order power control unit, and the anode of the first voltage stabilizing didoe D1 is connected with first order power control unit;
First order power control unit comprises: the anode and the 9th resistance R 9 between the ground and second capacitor C 2 that are parallel to the described first voltage stabilizing didoe D1; Be connected in the 4th voltage stabilizing didoe D4 of the CA end of the anode of the described first voltage stabilizing didoe D1 and U1, the negative electrode of the 4th voltage stabilizing didoe D4 is connected with the anode of the first voltage stabilizing didoe D1; Be connected in the first triode G2 between the first voltage stabilizing didoe D1 and the second level power control unit, the base stage of the described first triode G2 is connected with the anode of the first voltage stabilizing didoe D1, emitter is connected with ground, and collector electrode is connected with described second level power control unit;
Second level power control unit comprises: be connected on the 3rd resistance R 3, the second voltage stabilizing didoe D2 and the 7th resistance R 7 between input voltage and the ground successively, the negative electrode of the second voltage stabilizing didoe D2 is connected with the 3rd resistance R 3; Be connected on the 4th resistance R 4 and the second triode G3 between input voltage and the ground successively, the base stage of the second triode G3 is connected grounded emitter with the anode of the described second voltage stabilizing didoe D2; Be connected in the MOSFET pipe G1 between described input voltage and the car-mounted terminal, the grid of MOSFET pipe G1 links to each other with the collector electrode of the second triode G3, the source electrode of G1 is connected with input voltage, and the drain electrode of G1 is connected with the DC/DC filter unit of car-mounted terminal, as the Y2 unit in the accompanying drawing 2.As an embodiment, the first triode G2 and the second triode G3 are the NPN pipe.In order to obtain the protection voltage range of broad, as a preferred embodiment, R1, R2, R3 select the bigger resistance of power.
The operation principle of the wide voltage source protective circuit of car-mounted terminal device is as follows among Fig. 3:
(1), the car-mounted terminal apparatus for protecting power supply provides under-voltage comparison reference voltage by accurate reference voltage unit Q1, and finish comparing function, (branch pressure voltage of gathering the storage battery output voltage of comparing unit partial pressure type collection by low-voltage was lower than the under voltage reference comparison voltages when comparing unit was gathered the branch pressure voltage of the output voltage of described automobile storage battery and is lower than under-voltage comparison reference voltage when low-voltage is gathered, for example, VC<2.5V), the voltage-stabiliser tube D4 conducting of working, NPN triode switch G2 closure, not conducting of voltage-stabiliser tube D2, NPN triode switch G3 disconnects, MOSFET pipe switch G1 disconnects, this device cuts off car-mounted terminal from the automobile storage battery power taking, simultaneously can use reserve battery (as needs), both protect automobile storage battery to guarantee that also system still can keep a period of time operate as normal;
(2), when the terminal input voltage surpasses setting overvoltage stop valve threshold voltage, the voltage-stabiliser tube D1 conducting of working, NPN triode switch G2 closure, not conducting of voltage-stabiliser tube D2, NPN triode switch G3 disconnects, and MOSFET pipe switch G1 disconnects, and this device cuts off car-mounted terminal from the automobile storage battery power taking, cutting off threshold values can set according to specifically being used for, and this device can work in high to the 100V direct voltage;
(3), when the automobile storage battery output voltage or after the car-mounted terminal input voltage was returned in the normal range (NR), other interference and fault get rid of, this apparatus for protecting power supply can withdraw from guard mode automatically, recovers normal power supply and gives electricity, guarantees the normal safe operation of terminal system.
In sum, as long as be no more than maximum car-mounted terminal input direct voltage (for example 100V), car-mounted terminal power supply and equipment thereof and are implemented intelligent monitoring all within protection range.
From present embodiment as can be seen, this device is formed simple in structure, uses number of devices few, and the volume that takies car-mounted terminal is less, all is gadgets commonly used as the device volume in each element circuit among Fig. 3, realizes that principle is simple and easy to use.In addition, this device internal components is a passive device, is different from the integrated chip that uses in the classical management approach, and working power (being taken from automobile storage battery) need be provided itself, just has restriction so to a great extent.As long as what this device was no more than device bears electric current, voltage, the protective device operation irregularity can not appear because of the change of input voltage, do not imported the restriction of power supply substantially.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.

Claims (5)

1. the wide voltage source protective device of a car-mounted terminal is connected between car-mounted terminal and the automobile storage battery, it is characterized in that, comprising:
Precisely reference voltage unit is used to provide under-voltage comparison reference voltage, compares with the branch pressure voltage of the output voltage of described automobile storage battery, and sends to under-voltage comparative result and overvoltage crowbar;
Described under-voltage and overvoltage crowbar; be used to provide the branch pressure voltage of the output voltage of described automobile storage battery; and the input voltage of more described car-mounted terminal turn-offs threshold voltage with the overvoltage that sets in advance, according to comparative result or the comparative result control car-mounted terminal of described accurate reference voltage unit and the break-make of automobile storage battery of described under-voltage and overvoltage crowbar.
2. the wide voltage source protective device of car-mounted terminal according to claim 1 is characterized in that,
Described under-voltage and overvoltage crowbar comprises that low-voltage is gathered comparing unit, high voltage is gathered comparing unit, first order power control unit and second level power control unit;
Described low-voltage is gathered comparing unit and is connected with described automobile storage battery, is used to gather the output voltage of described automobile storage battery and the under-voltage comparison reference voltage of described accurate reference voltage unit, and the branch pressure voltage of the output voltage of described automobile storage battery is provided;
Described high voltage is gathered comparing unit and is connected with described car-mounted terminal, is used to gather the input voltage of described car-mounted terminal, and compares with described overvoltage shutoff threshold voltage;
Described first order power control unit is used for controlling according to the comparative result that described accurate reference voltage unit or described high voltage are gathered comparing unit the break-make of described second level power control unit;
Described second level power control unit is connected with described car-mounted terminal, is used for conducting or disconnects being connected of described car-mounted terminal and automobile storage battery.
3. the wide voltage source protective device of car-mounted terminal according to claim 2 is characterized in that,
Described accurate reference voltage unit comprises first resistance, the 6th resistance and the parallel connection type three-terminal voltage-stabilizing a reference source that is connected on successively between input voltage and the ground; Described parallel connection type three-terminal voltage-stabilizing a reference source, plus earth, negative electrode is connected with described the 6th resistance, and reference edge is connected with described low pressure collecting unit; Be parallel to output and the electric capacity between the ground and the 3rd voltage stabilizing didoe of first resistance; Be connected in the input of described parallel connection type three-terminal voltage-stabilizing a reference source and first electric capacity of reference voltage end.
4. the wide voltage source protective device of car-mounted terminal according to claim 3 is characterized in that, described low-voltage is gathered comparing unit and comprised the 5th resistance and the 8th resistance that is connected on successively between described input voltage and the ground; The reference voltage end of described parallel connection type three-terminal voltage-stabilizing a reference source is connected between described the 5th resistance and the 6th resistance;
Described high voltage is gathered comparing unit and is comprised second resistance and first voltage stabilizing didoe that is connected on successively between described input voltage and the described first order power control unit, the anode of described first voltage stabilizing didoe is connected with described first order power control unit, and negative electrode is connected with described second resistance;
Described first order power control unit comprises: the anode and the 9th resistance between the ground and second electric capacity that are parallel to described first voltage stabilizing didoe; Be connected in the 4th voltage stabilizing didoe of the anode of the anode of described first voltage stabilizing didoe and described parallel connection type three-terminal voltage-stabilizing a reference source, the negative electrode of described the 4th voltage stabilizing didoe is connected with the anode of described first voltage stabilizing didoe; Be connected in first triode between described first voltage stabilizing didoe and the described second level power control unit, the base stage of described first triode is connected with the anode of described first voltage stabilizing didoe, emitter is connected with ground, and collector electrode is connected with described second level power control unit;
Described second level power control unit comprises the 3rd resistance, second voltage stabilizing didoe and the 7th resistance that is connected on successively between input voltage and the ground; The negative electrode of described second voltage stabilizing didoe is connected with described the 3rd resistance; Be connected on the 4th resistance and second triode between input voltage and the ground successively, the base stage of described second triode is connected grounded emitter with the anode of described second voltage stabilizing didoe; Be connected in the MOSFET pipe between described input voltage and the car-mounted terminal; The grid of described MOSFET pipe links to each other with the collector electrode of second triode, and source electrode is connected with input voltage, and drain electrode is connected with the DC/DC filter unit of car-mounted terminal.
5. the wide voltage source protective device of car-mounted terminal according to claim 4 is characterized in that, described first resistance, second resistance, the 3rd resistance are the bigger resistance of power.
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CN103066569A (en) * 2012-12-18 2013-04-24 唐山轨道客车有限责任公司 Storage battery low-voltage protecting device and storage battery low-voltage protecting system
CN103386934A (en) * 2012-05-10 2013-11-13 航天信息股份有限公司 Power supply device and power supply method of vehicle-mounted electronic device
CN103683207A (en) * 2013-12-23 2014-03-26 北京易艾斯德科技有限公司 Under-voltage and over-voltage protection circuit for power supply circuit
CN104009447A (en) * 2013-02-27 2014-08-27 深圳市阿科达汽车电子有限公司 Vehicle-mounted overvoltage protection circuit
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CN106655083A (en) * 2016-09-19 2017-05-10 深圳市康凯斯信息技术有限公司 Wide voltage power supply protection device and method for electric car vehicle equipment
CN107402537A (en) * 2017-08-11 2017-11-28 中国汽车技术研究中心 A kind of new-energy automobile monitoring terminal system of car networking
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CN103386934B (en) * 2012-05-10 2016-04-06 航天信息股份有限公司 The electric supply installation of vehicle electronic device and method
CN103386934A (en) * 2012-05-10 2013-11-13 航天信息股份有限公司 Power supply device and power supply method of vehicle-mounted electronic device
CN103066569A (en) * 2012-12-18 2013-04-24 唐山轨道客车有限责任公司 Storage battery low-voltage protecting device and storage battery low-voltage protecting system
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CN103683207A (en) * 2013-12-23 2014-03-26 北京易艾斯德科技有限公司 Under-voltage and over-voltage protection circuit for power supply circuit
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CN107979063B (en) * 2016-10-21 2022-04-26 罗伯特·博世有限公司 Device for switching off at least one component of a control unit
CN107402537A (en) * 2017-08-11 2017-11-28 中国汽车技术研究中心 A kind of new-energy automobile monitoring terminal system of car networking
CN108199566A (en) * 2017-12-26 2018-06-22 成都鼎信致远科技有限公司 Direct current window type work high temperature pulse power supply with DC over-voltage protection
CN112886695A (en) * 2019-11-29 2021-06-01 台达电子工业股份有限公司 Uninterruptible power supply system
CN113131539A (en) * 2019-12-30 2021-07-16 Tcl新技术(惠州)有限公司 Terminal charging circuit and method

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