CN104242233A - Overvoltage-undervoltage protecting circuit automatically supporting different power systems - Google Patents
Overvoltage-undervoltage protecting circuit automatically supporting different power systems Download PDFInfo
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- CN104242233A CN104242233A CN201410501026.4A CN201410501026A CN104242233A CN 104242233 A CN104242233 A CN 104242233A CN 201410501026 A CN201410501026 A CN 201410501026A CN 104242233 A CN104242233 A CN 104242233A
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Abstract
The invention provides an overvoltage-undervoltage protecting circuit automatically supporting different power systems. The overvoltage-undervoltage protecting circuit comprises a voltage input end Vin connected to a car battery, a voltage output end Vout connected to vehicular terminal, a switch tube Q1 which is located between the Vin and the Vout and used for controlling on and off of the Vin and the Vout, a resistor R11 for providing stable voltage when the Q1 is off, an isolation resistor R7 and at least two groups of control circuits. The control circuits respectively control on and off of the Q1, the Vout can obtain output voltage when any group of control circuits works, and the voltage of the Vout is 0V when all the control circuits do not work. Compared with the prior art, the overvoltage-undervoltage protecting circuit has the advantages that overvoltage-undervoltage protecting automatically supporting different power systems different power systems is achieved, and the circuit is low in cost, high in reliability, long in service life, free of manual operation, and the like.
Description
Technical field
The present invention relates to car-mounted terminal, what be specifically related to is a kind of over under-voltage protection circuit of automatic support different electrical power system.
Background technology
As everyone knows, the over-discharge can of automobile batteries easily causes the damage of automobile batteries and automobile cannot ignition trigger, and vehicle-mounted terminal equipment overvoltage work may cause the permanent damages of terminal.
In order to solve the problem, need to add over under-voltage protection circuit and terminal is protected.But automobile power system out-put supply disunity (common are 12V system, 24V system, 36V system and 48V system etc.) in the market, and the magnitude of voltage of different electrical power system requirements overvoltage/undervoltage protection there are differences, certain difficulty is increased to realizing, now way has two kinds usually: one, the car-mounted terminal of difference development support different electrical power system, but greatly can increase cost; Two, design artificial operation transformation switch, realize the switching supporting different electrical power system, owing to adding manual operation factor, practical application is very inconvenient.
Summary of the invention
For this reason, the object of the present invention is to provide a kind of over under-voltage protection circuit of automatic support different electrical power system, to solve the car-mounted terminal of development support different electrical power system, there is the problem of the high problem of cost and handover operation inconvenience manually.
The object of the invention is to be achieved through the following technical solutions.
An over under-voltage protection circuit for automatic support different electrical power system, comprising:
The voltage input end Vin of one connection automobile batteries;
The voltage output end Vout of one connection car-mounted terminal;
One between voltage input end Vin and voltage output end Vout for performing the switching tube Q1 of Vin to Vout break-make, resistance R11 and the isolation resistance R7 that steady state voltage is provided when switching tube Q1 turns off;
At least two group control circuits, the break-make of switch tube Q1 controls respectively, and when any one group of control circuit is in active states, voltage output end Vout can obtain output voltage; And all control circuits are when being in non-active states, voltage output end Vout voltage is 0V.
Further, described control circuit comprises first group of control circuit and second group of control circuit;
Described first group of control circuit comprises voltage-stabiliser tube DW1, DW3, resistance R1, R2, R3, R9, the protection device DW6 of triode Q2, Q3 and circuit, DW7, described voltage-stabiliser tube DW1 one end is connected to voltage input end Vin, and the other end is connected to the B pole of triode Q2 by resistance R1, R9; Voltage-stabiliser tube DW3 one end is connected to voltage input end Vin, and the other end is connected with the C pole of triode Q2 by resistance R2, R3, and the C pole of described triode Q2 is connected with the B pole of triode Q3, and the C pole of described triode Q3 is connected with switching tube Q1 by isolation resistance R7;
The voltage stabilizing value of described voltage-stabiliser tube DW1 is greater than the voltage stabilizing value of DW3;
Described second group of control circuit comprises voltage-stabiliser tube DW2, DW4, resistance R4, R5, R6, R10, the protection device DW8 of triode Q4, Q5 and circuit, DW9, described voltage-stabiliser tube DW2 one end is connected to voltage input end Vin, and the other end is connected with the B pole of triode Q4 by resistance R4, R10; Voltage-stabiliser tube DW4 one end is connected to voltage input end Vin, and the other end is connected with the C pole of triode Q4 by resistance R5, R6, and the C pole of triode Q4 is connected with the B pole of triode Q5, and the C pole of described triode Q5 is connected with switching tube Q1 by isolation resistance R7;
The voltage stabilizing value of described voltage-stabiliser tube DW2 is greater than the voltage stabilizing value of DW4, and the voltage stabilizing value of voltage-stabiliser tube DW4 is greater than the voltage stabilizing value of voltage-stabiliser tube DW1;
When in wherein said first group of control circuit, triode Q3 is in conducting state, first group of control circuit is in active states, and the break-make of its switch tube Q1 controls, and voltage output end Vout can obtain output voltage;
When in described second group of control circuit, triode Q5 is in conducting state, second group of control circuit is in active states, and the break-make of its switch tube Q1 controls, and voltage output end Vout can obtain output voltage;
In described first group of control circuit, triode Q3 is in cut-off state, and when simultaneously triode Q5 is in cut-off state in second group of control circuit, first group, second group control circuit is in non-active states, and voltage output end Vout voltage is 0V.
Further, this circuit also includes protection device DW5 and the electric capacity C1 of switching tube Q1, and after described DW5, C1, R11 parallel connection, one end is connected with voltage input end Vin, and the other end is connected between switching tube Q1 and isolation resistance R7.
Further, when voltage input end Vin magnitude of voltage is less than the voltage stabilizing value of DW3, voltage input end Vin voltage is lower than the puncture voltage of DW1, DW2, DW3, DW4, described voltage-stabiliser tube DW1, DW2, DW3, DW4 are all equivalent to high resistant, triode Q3 and Q5 is operated in cut-off state, switching tube Q1 turns off, and voltage output end Vout output voltage is 0V.
Further, when voltage input end Vin magnitude of voltage is between the voltage stabilizing value of DW3 and DW1, DW3 is in breakdown conditions, be rendered as low-resistance, now to be equivalent to high resistant constant for DW1, DW2, DW4, triode Q3 is operated in conducting state, then switching tube Q1 conducting, and voltage output end Vout exports the magnitude of voltage equaling voltage input end Vin.
Further, when voltage input end Vin magnitude of voltage is between the voltage stabilizing value of DW4 and DW1, DW1, DW3 are in breakdown conditions, be rendered as low-resistance, it is constant that DW2, DW4 are equivalent to high resistant, and DW1 punctures makes Q2 be operated in conducting state, now Q3 cut-off, switching tube Q1 turns off, and voltage output end Vout output voltage is 0V.
Further, when voltage input end Vin magnitude of voltage is between the voltage stabilizing value of DW2 and DW4, DW1, DW3, DW4 are in breakdown conditions, be equivalent to low-resistance, it is constant that DW2 is equivalent to high resistant, now triode Q5 is operated in conducting state, switching tube Q1 conducting, and voltage output end Vout exports the magnitude of voltage equaling voltage input end Vin.
Further, when voltage input end Vin magnitude of voltage is greater than the voltage stabilizing value of DW2, DW1, DW2, DW3, DW4 are in breakdown conditions, be equivalent to low-resistance, now triode Q3, Q5 is in cut-off operating state, and switching tube Q1 turns off, and voltage output end Vout output voltage is 0V.
The present invention is by least two group control circuits, and the break-make of switch tube Q1 controls respectively, and when any one group of control circuit is in active states, voltage output end Vout just can obtain output voltage; When all control circuits are all in non-active states, the voltage of voltage output end Vout is 0V.Compared with prior art, present invention achieves the overvoltage/undervoltage protection automatically supporting different electrical power system, it has, and cost is low, reliability is high, long service life, without the need to advantages such as manual operations.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of over under-voltage protection circuit of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to shown in Fig. 1, Fig. 1 is the circuit theory diagrams of over under-voltage protection circuit of the present invention.The present invention is to provide a kind of over under-voltage protection circuit, it can realize automatically supporting that the overvoltage/undervoltage of different electrical power system is protected, and has to reduce costs, promote the advantages such as reliability, long service life, automation.
The present invention includes voltage input end Vin, voltage output end Vout, between voltage input end Vin and voltage output end Vout for performing switching tube Q1 and at least two group control circuit of Vin to Vout break-make, controlled by the break-make of two groups of control circuit switch tube Q1, and when any one group of control circuit is in active states, voltage output end Vout can obtain output voltage; And all control circuits are when being in non-active states, the voltage of voltage output end Vout is then 0V.
The present embodiment is described for two groups of control circuits, in actual use, can increase as required and organize control circuit more.
Switching tube Q1 is mainly used in the break-make performing Vin to Vout, and DW5 is the protection device of switching tube Q1; The existence of electric capacity C1 can strengthen the antijamming capability of whole circuit; Resistance R11 is for providing steady state voltage when switching tube Q1 turns off; R7 is isolation resistance.Wherein after DW5, C1, R11 parallel connection, one end is connected with voltage input end Vin, and the other end is connected between switching tube Q1 and isolation resistance R7.
It should be noted that, in the present embodiment, voltage input end Vin connects automobile batteries, and voltage output end Vout connects car-mounted terminal, and R8 is equivalent to car-mounted terminal, and one end ground connection, the other end is connected between switching tube Q1 and voltage output end Vout.
First group of control circuit is for realizing the control of switch tube Q1 break-make, and it includes voltage-stabiliser tube DW1, DW3, resistance R1, R2, R3, R9, the protection device DW6 of triode Q2, Q3 and circuit, DW7.
Voltage-stabiliser tube DW1 one end is connected to voltage input end Vin, and the other end is connected to the B pole of triode Q2 by resistance R1, R9, and protection device DW6 one end ground connection of circuit, the other end is connected between resistance R1 and R9 of series connection.
Voltage-stabiliser tube DW3 one end is connected to voltage input end Vin, and the other end is connected with the C pole of triode Q2 by resistance R2, R3, and protection device DW7 one end ground connection of circuit, the other end is connected between resistance R2 and R3 of series connection.The E pole ground connection of triode Q2, C pole is connected with the B pole of triode Q3, and the C pole of described triode Q3 is connected with switching tube Q1 by isolation resistance R7.
Second group of control circuit is for realizing the control of switch tube Q1 break-make, and it includes voltage-stabiliser tube DW2, DW4, resistance R4, R5, R6, R10, the protection device DW8 of triode Q4, Q5 and circuit, DW9.
Voltage-stabiliser tube DW2 one end is connected to voltage input end Vin, and the other end is connected with the B pole of triode Q4 by resistance R4, R10, and protection device DW8 one end ground connection of circuit, the other end is connected between resistance R4, R10 of series connection.
Voltage-stabiliser tube DW4 one end is connected to voltage input end Vin, and the other end is connected with the C pole of triode Q4 by resistance R5, R6, and protection device DW9 one end ground connection of circuit, the other end is connected between resistance R5, R6 of series connection.
The E pole ground connection of triode Q4, C pole is connected with the B pole of triode Q5, and the C pole of described triode Q5 is connected with switching tube Q1 by isolation resistance R7.
In this enforcement, in first group of control circuit, the voltage stabilizing value of voltage-stabiliser tube DW1 must be greater than the voltage stabilizing value of voltage-stabiliser tube DW3, in second group of control circuit, the voltage stabilizing value of voltage-stabiliser tube DW2 must be greater than the voltage stabilizing value of voltage-stabiliser tube DW4, and the voltage stabilizing value of voltage-stabiliser tube DW4 is greater than the voltage stabilizing value of voltage-stabiliser tube DW1.
With the voltage stabilizing value of DW2>DW4>DW1>DW 3 for condition, at A, B, C, D, E double teacher, operation principle is carried out to Vin terminal voltage value and is described as follows (note: following operation principle illustrates the Vbe value all ignoring Q2, Q3, Q4, Q5 triode).
Stage one, Vin terminal voltage value is below the voltage stabilizing value of DW3:
The puncture voltage of Vin voltage low DW1, DW2, DW3, DW4,4 voltage-stabiliser tubes are all equivalent to high resistant, and the Ibe electric current flowing through Q3 and Q5 is almost 0, Q3 and Q5 and is operated in cut-off state, then switching tube Q1 turns off, and Vout holds output voltage to be 0V.
Stage two, Vin terminal voltage value is between the voltage stabilizing value of DW3 ~ DW1:
DW3 is in breakdown conditions, is rendered as low-resistance, and it is constant that DW1, DW2, DW4 are equivalent to high resistant; Flow through the anxious increasing of Ibe electric current of Q3.Q3 is operated in conducting state, then switching tube Q1 conducting, and Vout end exports the magnitude of voltage equaling Vin end.
Stage three, Vin terminal voltage value is between the voltage stabilizing value of DW1 ~ DW4:
DW1, DW3 are in breakdown conditions, are rendered as low-resistance, and it is constant that DW2, DW4 are equivalent to high resistant; Because puncturing of DW1 makes Q2 be operated in conducting state, the conducting of Q2 cause flow through Q3 triode Ibe electric current be almost 0, Q3 cut-off, then switching tube Q1 turns off, Vout end output voltage be 0V.
Stage four, Vin terminal voltage value is between the voltage stabilizing value of DW4 ~ DW2:
DW1, DW3, DW4 are in breakdown conditions, are equivalent to low-resistance, and it is constant that DW2 is equivalent to high resistant; Analyze with the stage three and learn that DW1, DW3 are in breakdown conditions simultaneously and Q3 can be caused to end; DW4 is in the anxious increasing of Ibe electric current that breakdown conditions makes to flow through Q5, and Q5 is operated in conducting state; Then switching tube Q1 conducting, Vout end exports the magnitude of voltage equaling Vin end.
Stage five, Vin terminal voltage value is more than the voltage stabilizing value of DW2:
DW1, DW2, DW3, DW4 are in breakdown conditions, are equivalent to low-resistance; Analyze with the stage three and learn that DW1, DW3 are in breakdown conditions simultaneously and Q3 can be caused to end; In like manner analyze, DW2, DW4 are in breakdown conditions simultaneously and Q5 can be caused to end; Because Q3, Q5 are in cut-off operating state, switching tube Q1 turns off, and Vout holds output voltage to be 0V.
It can thus be appreciated that when Vin terminal voltage value is between DW3 ~ DW1 voltage stabilizing value and between DW4 ~ DW2 voltage stabilizing value, Vout end has normal voltage to export, otherwise is then 0V, thus realizes the overvoltage/undervoltage defencive function automatically supporting different electrical power system.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. automatically support an over under-voltage protection circuit for different electrical power system, it is characterized in that, comprising:
The voltage input end Vin of one connection automobile batteries;
The voltage output end Vout of one connection car-mounted terminal;
One between voltage input end Vin and voltage output end Vout for performing the switching tube Q1 of Vin to Vout break-make, resistance R11 and the isolation resistance R7 that steady state voltage is provided when switching tube Q1 turns off;
At least two group control circuits, the break-make of switch tube Q1 controls respectively, and when any one group of control circuit is in active states, voltage output end Vout can obtain output voltage; And all control circuits are when being in non-active states, voltage output end Vout voltage is 0V.
2. the over under-voltage protection circuit automatically supporting different electrical power system as claimed in claim 1, it is characterized in that, described control circuit comprises first group of control circuit and second group of control circuit;
Described first group of control circuit comprises voltage-stabiliser tube DW1, DW3, resistance R1, R2, R3, R9, the protection device DW6 of triode Q2, Q3 and circuit, DW7, described voltage-stabiliser tube DW1 one end is connected to voltage input end Vin, and the other end is connected to the B pole of triode Q2 by resistance R1, R9; Voltage-stabiliser tube DW3 one end is connected to voltage input end Vin, and the other end is connected with the C pole of triode Q2 by resistance R2, R3, and the C pole of described triode Q2 is connected with the B pole of triode Q3, and the C pole of described triode Q3 is connected with switching tube Q1 by isolation resistance R7;
The voltage stabilizing value of described voltage-stabiliser tube DW1 is greater than the voltage stabilizing value of DW3;
Described second group of control circuit comprises voltage-stabiliser tube DW2, DW4, resistance R4, R5, R6, R10, the protection device DW8 of triode Q4, Q5 and circuit, DW9, described voltage-stabiliser tube DW2 one end is connected to voltage input end Vin, and the other end is connected with the B pole of triode Q4 by resistance R4, R10; Voltage-stabiliser tube DW4 one end is connected to voltage input end Vin, and the other end is connected with the C pole of triode Q4 by resistance R5, R6, and the C pole of triode Q4 is connected with the B pole of triode Q5, and the C pole of described triode Q5 is connected with switching tube Q1 by isolation resistance R7;
The voltage stabilizing value of described voltage-stabiliser tube DW2 is greater than the voltage stabilizing value of DW4, and the voltage stabilizing value of voltage-stabiliser tube DW4 is greater than the voltage stabilizing value of voltage-stabiliser tube DW1;
When in wherein said first group of control circuit, triode Q3 is in conducting state, first group of control circuit is in active states, and the break-make of its switch tube Q1 controls, and voltage output end Vout can obtain output voltage;
When in described second group of control circuit, triode Q5 is in conducting state, second group of control circuit is in active states, and the break-make of its switch tube Q1 controls, and voltage output end Vout can obtain output voltage;
In described first group of control circuit, triode Q3 is in cut-off state, and when simultaneously triode Q5 is in cut-off state in second group of control circuit, first group, second group control circuit is in non-active states, and voltage output end Vout voltage is 0V.
3. the over under-voltage protection circuit automatically supporting different electrical power system as claimed in claim 2; it is characterized in that; also include protection device DW5 and the electric capacity C1 of switching tube Q1; after described DW5, C1, R11 parallel connection, one end is connected with voltage input end Vin, and the other end is connected between switching tube Q1 and isolation resistance R7.
4. the over under-voltage protection circuit automatically supporting different electrical power system as claimed in claim 2; it is characterized in that; when voltage input end Vin magnitude of voltage is less than the voltage stabilizing value of DW3; voltage input end Vin voltage is lower than the puncture voltage of DW1, DW2, DW3, DW4; described voltage-stabiliser tube DW1, DW2, DW3, DW4 are all equivalent to high resistant; triode Q3 and Q5 is operated in cut-off state, and switching tube Q1 turns off, and voltage output end Vout output voltage is 0V.
5. the over under-voltage protection circuit automatically supporting different electrical power system as claimed in claim 2; it is characterized in that; when voltage input end Vin magnitude of voltage is between the voltage stabilizing value of DW3 and DW1; DW3 is in breakdown conditions; be rendered as low-resistance, to be now equivalent to high resistant constant for DW1, DW2, DW4, and triode Q3 is operated in conducting state; then switching tube Q1 conducting, voltage output end Vout exports the magnitude of voltage equaling voltage input end Vin.
6. the over under-voltage protection circuit automatically supporting different electrical power system as claimed in claim 2; it is characterized in that; when voltage input end Vin magnitude of voltage is between the voltage stabilizing value of DW4 and DW1; DW1, DW3 are in breakdown conditions, are rendered as low-resistance, and it is constant that DW2, DW4 are equivalent to high resistant; DW1 punctures makes Q2 be operated in conducting state; now Q3 cut-off, switching tube Q1 turns off, and voltage output end Vout output voltage is 0V.
7. the over under-voltage protection circuit automatically supporting different electrical power system as claimed in claim 2; it is characterized in that; when voltage input end Vin magnitude of voltage is between the voltage stabilizing value of DW2 and DW4; DW1, DW3, DW4 are in breakdown conditions; be equivalent to low-resistance, it is constant that DW2 is equivalent to high resistant, and now triode Q5 is operated in conducting state; switching tube Q1 conducting, voltage output end Vout exports the magnitude of voltage equaling voltage input end Vin.
8. the over under-voltage protection circuit automatically supporting different electrical power system as claimed in claim 2; it is characterized in that; when voltage input end Vin magnitude of voltage is greater than the voltage stabilizing value of DW2; DW1, DW2, DW3, DW4 are in breakdown conditions; be equivalent to low-resistance; now triode Q3, Q5 is in cut-off operating state, and switching tube Q1 turns off, and voltage output end Vout output voltage is 0V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410501026.4A CN104242233A (en) | 2014-09-26 | 2014-09-26 | Overvoltage-undervoltage protecting circuit automatically supporting different power systems |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410501026.4A CN104242233A (en) | 2014-09-26 | 2014-09-26 | Overvoltage-undervoltage protecting circuit automatically supporting different power systems |
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| CN201410501026.4A Pending CN104242233A (en) | 2014-09-26 | 2014-09-26 | Overvoltage-undervoltage protecting circuit automatically supporting different power systems |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105846402A (en) * | 2016-06-01 | 2016-08-10 | 江苏安纳金机械有限公司 | Power source protection circuit |
| CN107896061A (en) * | 2017-11-30 | 2018-04-10 | 云顶科技（江苏）有限公司 | A kind of power supply protection system being used in new cleaning fuel equipment |
| CN109088393A (en) * | 2017-06-13 | 2018-12-25 | 常州格力博有限公司 | Under-voltage protecting circuit and electronic equipment |
| CN115140008A (en) * | 2022-09-06 | 2022-10-04 | 万向钱潮股份公司 | Vehicle braking system control device |
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| CN204068198U (en) * | 2014-09-26 | 2014-12-31 | 深圳市伊爱高新技术开发有限公司 | A kind of over under-voltage protection circuit of automatic support different electrical power system |
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| CN2757400Y (en) * | 2004-12-29 | 2006-02-08 | 长春一汽启明信息技术股份有限公司 | Power module special for automobile |
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| CN109088393A (en) * | 2017-06-13 | 2018-12-25 | 常州格力博有限公司 | Under-voltage protecting circuit and electronic equipment |
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