CN202363968U - Dual-power input selection and power reverse connection prevention circuit - Google Patents
Dual-power input selection and power reverse connection prevention circuit Download PDFInfo
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- CN202363968U CN202363968U CN 201120523564 CN201120523564U CN202363968U CN 202363968 U CN202363968 U CN 202363968U CN 201120523564 CN201120523564 CN 201120523564 CN 201120523564 U CN201120523564 U CN 201120523564U CN 202363968 U CN202363968 U CN 202363968U
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Abstract
The utility model belongs to the technical field of aviation electronics, and relates to a dual-power input selection and power reverse connection prevention circuit, which consists of a first power input sampling circuit [11], a second power input sampling circuit [21], a first input channel switch [12], a second input channel switch [22], a first switching signal generation circuit [13] and a second switching signal generation circuit [23]. A metal oxide semiconductor (MOS) replaces a diode, so that the aims of dual-power input selection and power reverse connection prevention can be fulfilled, the problems of voltage drop and over-high power consumption of the conventional power reverse connection prevention scheme adopting the diode are solved, protection over subsequent electrical equipment under a power reverse connection condition is effectively realized, the conversion efficiency of a power system is improved, the heating of the electrical equipment is reduced, and favorable support is provided for the thermal design of the electrical equipment.
Description
Technical field
The utility model belongs to the avionics field, relates to a kind of duplicate supply input and selects, prevents power supply reversal connection circuit.
Background technology
The duplicate supply input is selected, anti-power supply reversal connection circuit is widely used on the various airborne vehicle direct current source plates, is a kind of circuit relatively more commonly used.As shown in Figure 1; The input of traditional double power supply selects, prevents that it is that basic components and parts design that power supply reversal connection circuit all adopts power diode, and its basic principle is to utilize the unidirectional on state characteristic of diode to reach the selection of input power supply and prevent that power supply reversal connection input from damaging the purpose of power consumption equipment.
The input of traditional double power supply is selected, there are following two big shortcomings in anti-power supply reversal connection circuit: at first, because there is fixing pressure drop in diode, for some low voltage application, possibly cause system works undesired.Like airborne electronic equipment product input power supply is 16V; Because there is the pressure drop of 0.3V～1.2V in diode; Make the voltage that obtains in the load have only 14.8V～15.7V; And the input voltage range of the main flow secondary power supply modular converter that on present airborne electronic equipment product, uses is 16V～40V, and so low power input voltage will cause the secondary power supply modular converter to start, and causes the load can't operate as normal.Secondly, for the application of some big electric currents, because the pressure drop relative fixed of diode causes the power that consumes on the diode excessive, the diode radiating difficulty, the reliability of circuit reduces, and the efficient of power supply also decreases.Like the power supply input current for 10A, the power loss on the diode will have 3W～12W, need add very big radiator and could guarantee that circuit can operate as normal.
Summary of the invention
Goal of the invention: the purpose of the utility model provides a kind of novel duplicate-power input and selects, prevents power supply reversal connection circuit, can overcome the input of traditional double power supply is selected, anti-power supply reversal connection circuit exists pressure drop and the big defective of power consumption.
The technical scheme of the utility model: the input of a kind of duplicate supply is selected, anti-power supply reversal connection circuit, is made up of the first power supply input sampling circuit 11, second source input sampling circuit 21, the first input channel switch 12, the second input channel switch 22, the first switching signal generation circuit 13 and second switch signal generating circuit 23;
The said first power supply input sampling circuit, 11 inputs are connected with first power input 01 respectively with the first input channel switch, 12 inputs; The first power supply input sampling circuit, 11 outputs are connected with the input of the first switching signal generation circuit 13 and the input of second switch signal generating circuit 23, and the said first input channel switch, 12 inputs also are connected with the output of the first switching signal generation circuit 13;
Said second source input sampling circuit 21 inputs are connected with second source input 02 respectively with the second input channel switch, 22 inputs; Second source input sampling circuit 21 outputs are connected with the input of second switch signal generating circuit 23 and the input of the first switching signal generation circuit 13, and the said second input channel switch, 22 inputs also are connected with the output of second switch signal generating circuit 23;
The output of said first passage switch 12 is connected with the output of second channel switch 22, the output 03 that input is selected as duplicate supply.
Preferably, said first power supply input sampling circuit 11 and second source input sampling circuit 21 include TVS diode, anti-power supply input reversal connection diode, resistance, electric capacity and voltage-stabiliser tube.
Preferably, the said first input channel switch 12 and the second input channel switch 22 include four P channel power MOS pipes, N channel switches metal-oxide-semiconductor, resistance and a voltage-stabiliser tube.
Preferably, said first switching signal generation circuit 13 and second switch signal generating circuit 23 include comparator, resistance.
Beneficial effect: the utility model is owing to used metal-oxide-semiconductor to replace diode; Can not only realize that the duplicate supply input is selected and the purpose of anti-power supply reversal connection; But also solved pressure drop and the excessive problem of power consumption that the anti-reverse scheme of existing employing diode power source exists, and realized that effectively the power supply reversal connection goes under the situation the protection of follow-up power consumption equipment, improved the conversion efficiency of power-supply system; Reduced the caloric value of electronic equipment, for heat Design of Electronic Equipment provides favourable support.
Description of drawings
Fig. 1 is for the input of traditional double power supply is selected, anti-power supply reversal connection circuit diagram;
Fig. 2 is the schematic block circuit diagram of the utility model one preferred embodiments;
Fig. 3 is the circuit diagram of the utility model one preferred embodiments;
Wherein: 01-first power input; 02-second source input; The output that the input of 03-duplicate supply is selected; The 11-first power supply input sampling circuit; The 12-first input channel switch; The 13-first switching signal generation circuit; 21-second source input sampling circuit; The 22-second input channel switch; 23-second switch signal generating circuit.
Embodiment
Do in detail to describe in further detail below in conjunction with accompanying drawing team the utility model, see also Fig. 2 to Fig. 3.
See also Fig. 2, the utility model duplicate supply input is selected, anti-power supply reversal connection circuit is made up of the first power supply input sampling circuit 11, second source input sampling circuit 21, the first input channel switch 12, the second input channel switch 22, the first switching signal generation circuit 13 and second switch signal generating circuit 23;
The said first power supply input sampling circuit, 11 inputs are connected with first power input 01 respectively with the first input channel switch, 12 inputs; The first power supply input sampling circuit, 11 outputs are connected with the input of the first switching signal generation circuit 13 and the input of second switch signal generating circuit 23, and the said first input channel switch, 12 inputs also are connected with the output of the first switching signal generation circuit 13;
Said second source input sampling circuit 21 inputs are connected with second source input 02 respectively with the second input channel switch, 22 inputs; Second source input sampling circuit 21 outputs are connected with the input of second switch signal generating circuit 23 and the input of the first switching signal generation circuit 13, and the said second input channel switch, 22 inputs also are connected with the output of second switch signal generating circuit 23;
The course of work of the utility model is following:
(1), when first power supply input 01 imports 02 greater than second source:
The first power supply input sampling circuit 11 is sampled to input 01 of first power supply and second source input 02 with second source input sampling circuit 21 in real time; Two groups of magnitudes of voltage that sampling obtains are sent in the first switching signal generation circuit 13 and the second switch signal generating circuit 23; The first switching signal generation circuit 13 and second switch signal generating circuit 23 are through comparing two groups of sample voltage value; Judge that the input voltage value of first power supply input 01 is higher than the input voltage value of second source input 02; At this moment, the first switching signal generation circuit 13 sends " opening " signal, and second switch signal generating circuit 23 sends " closure " signal.The first input channel switch 12 is opened, the second input channel switch, 22 closures, thus first power supply input 01 is able to output, and second source input 02 is turned off, and can't export.
(2), when first power supply input 01 imports 02 less than second source:
The first power supply input sampling circuit 11 is sampled to input 01 of first power supply and second source input 02 with second source input sampling circuit 21 in real time; Two groups of magnitudes of voltage that sampling obtains are sent in the first switching signal generation circuit 13 and the second switch signal generating circuit 23; The first switching signal generation circuit 13 and second switch signal generating circuit 23 are through comparing two groups of sample voltage value; Judge that the input voltage value of first power supply input 01 is lower than the input voltage value of second source input 02; At this moment, the first switching signal generation circuit 13 sends " closure " signal, and second switch signal generating circuit 23 sends " opening " signal.The first input channel switch, 12 closures, the second input channel switch 22 is opened, thus first power supply input 01 is turned off, and second source input 02 is able to output.
(3), when first power supply input 01 equals second source and imports 02:
In the first switching signal generation circuit 13 and second switch signal generating circuit 23, with resistance R7 and R9 hysteresis voltage is provided with respectively.The setting of hysteresis voltage can effectively be eliminated because two groups of input power supplys that the frequent fluctuation of power supply input causes are identical, causes the situation of rear end input channel switch frequent " opened/closed ".
See also Fig. 3,, only set forth below with the first power supply input sampling circuit 11 because the first power supply input sampling circuit 11 is symmetrical fully with second source input sampling circuit 21.The first power supply input sampling circuit 11 is by TVS diode V1, and anti-power supply is imported reversal connection diode V5, resistance R 1, R2, and slow startup of filtering and power supply is provided with capacitor C 1, and voltage-stabiliser tube V8 constitutes.Anti-power supply reversal connection diode V5 can avoid when power supply input reversal connection, causing the situation of the switching signal generation circuit damage that is made up of comparator N7.Because the switching signal generation circuit that is made up of comparator N7 adopts the 12V power supply; (airborne input power supply is generally 16V～32V) to be lower than the first input power supply 11; Therefore (input voltage is 3V～6.3V) at this moment, and dividing potential drop is lower than to be expert at behind the 12V sends into switching signal generation circuit with resistance R1, R2 the input power supply have been carried out dividing potential drop.When instantaneous input voltage appearred in the first input power supply 11, voltage-stabiliser tube V8 was used for input voltage is carried out clamp, and setting clamp value here is 10V, is lower than the supply power voltage of comparator N7.TVS diode V1 and capacitor C 1 are used for clamp first and import the peak voltage that occurs on the power supply, and the clamping voltage of spike is less than 80V.
P channel power MOS pipe V11, V22, V13, V20 in the first input channel switch 12 and the second input channel switch 22, N channel switches metal-oxide-semiconductor V18, resistance R 14, R16, voltage-stabiliser tube V16 have constituted the first input channel switch 12 jointly.Similarly, P channel power MOS pipe V12, V21, V14, V19, N channel switches metal-oxide-semiconductor V17, resistance R 13, R15, voltage-stabiliser tube V15 have constituted the second input channel switch 22 jointly.
When the first input power supply 01 is higher than the second input power supply 02, grid and the source voltage V of N channel switches metal-oxide-semiconductor V18
GSBe 12V, metal-oxide-semiconductor V18 conducting.The first input power supply 01 will be with metal-oxide-semiconductor V11 or V13, and resistance R 14, R16 constitute path.At this moment, metal-oxide-semiconductor V11, V13, V20, V22 will be obtained the VGS bias voltage of 10V by voltage-stabiliser tube V16, metal-oxide-semiconductor V11, V13, V20, V22 conducting, and the first input channel switch 12 is opened, and the first input power supply 01 is able to output to the rear end.At this moment, the grid of N channel switches metal-oxide-semiconductor V17 and source voltage V
GSBe 0V, V17 ends, and metal-oxide-semiconductor V12, V14, V19, V21 end, and the second input channel switch 22 cuts out, and the first input power supply 02 can't output to the rear end.
When the first input power supply 01 is lower than the first input power supply 02, operation principle and last similar.
In the input channel switching circuit, V11, V22 and V13, V20, V12, V21 and V14, V19 have constituted parallel branch; Be used for shunting, reduce the power consumption on the single metal-oxide-semiconductor, improve the reliability of circuit input current; In the practical application, can accept or reject according to the size of input current.
In the input channel switching circuit, the metal-oxide-semiconductor V11 of selection, V22, V13, V20, all there are parasitic diode in V12, V21 among V14, the V19, and oppositely withstand voltage all is higher than 80V, and metal-oxide-semiconductor adopts the mode of butt joint in twos to connect.When input power supply reversal connection input, the inner parasitic diode of metal-oxide-semiconductor will play the effect of anti-power supply reversal connection.
Resistance R 7 is set for comparator N7, hysteresis voltage and resistance R 11 has constituted the first switching signal generation circuit 13.Resistance R 9 is set for comparator N8, hysteresis voltage and resistance R 12 has constituted second switch signal generating circuit 23.Comparator N7 and N8 compare the two-way power input voltage of sending into comparator in real time.When first power supply input 01 imported 02 greater than second source, the high level into 12V was drawn in comparator N7 output on the resistance R 11, comparator N8 output 0V low level; When first power supply input 01 imports 02 less than second source, comparator N7 output 0V low level, the high level into 12V is drawn in comparator N8 output on the resistance R 12.
Claims (4)
1. power supply reversal connection circuit is selected, is prevented in a duplicate supply input; It is characterized in that, form by the first power supply input sampling circuit [11], second source input sampling circuit [21], the first input channel switch [12], the second input channel switch [22], the first switching signal generation circuit [13] and second switch signal generating circuit [23];
Said first power supply input sampling circuit [11] input is connected with first power input [01] respectively with first input channel switch [12] input; First power supply input sampling circuit [11] output is connected with the input of the first switching signal generation circuit [13] and the input of second switch signal generating circuit [23], and said first input channel switch [12] input also is connected with the output of the first switching signal generation circuit [13];
Said second source input sampling circuit [21] input is connected with second source input [02] respectively with second input channel switch [22] input; Second source input sampling circuit [21] output is connected with the input of second switch signal generating circuit [23] and the input of the first switching signal generation circuit [13], and said second input channel switch [22] input also is connected with the output of second switch signal generating circuit [23];
The output of said first passage switch [12] is connected with the output of second channel switch [22], the output [03] that input is selected as duplicate supply.
2. a kind of duplicate supply input according to claim 1 is selected, anti-power supply reversal connection circuit; It is characterized in that said first power supply input sampling circuit [11] and second source input sampling circuit [21] include TVS diode, anti-power supply input reversal connection diode, resistance, electric capacity and voltage-stabiliser tube.
3. a kind of duplicate supply input according to claim 2 is selected, anti-power supply reversal connection circuit; It is characterized in that the said first input channel switch [12] and the second input channel switch [22] include four P channel power MOS pipes, N channel switches metal-oxide-semiconductor, resistance and a voltage-stabiliser tube.
4. select, prevent power supply reversal connection circuit according to claim 1 or 2 or 3 described a kind of duplicate supply inputs, it is characterized in that said first switching signal generation circuit [13] and second switch signal generating circuit [23] include comparator, resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201120523564 CN202363968U (en) | 2011-12-14 | 2011-12-14 | Dual-power input selection and power reverse connection prevention circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120523564 CN202363968U (en) | 2011-12-14 | 2011-12-14 | Dual-power input selection and power reverse connection prevention circuit |
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| CN202363968U true CN202363968U (en) | 2012-08-01 |
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| CN103354415A (en) * | 2013-06-28 | 2013-10-16 | 江苏浩峰汽车附件有限公司 | N-channel MOS tube grid electrode suspension drive circuit used to prevent reversed connection |
| CN104102260A (en) * | 2013-04-03 | 2014-10-15 | 国民技术股份有限公司 | Dual-power supply system |
| CN105354168A (en) * | 2014-08-22 | 2016-02-24 | 无锡华润矽科微电子有限公司 | Calculator circuit structure for realizing solar cell power supply automatic switching |
| CN105553251A (en) * | 2016-02-02 | 2016-05-04 | 航天长峰朝阳电源有限公司 | Secondary power supply converter with electromagnetic compatibility module |
| CN105703615A (en) * | 2016-04-13 | 2016-06-22 | 浪潮集团有限公司 | Anti-flow-backward design method for DC power supply redundant circuit |
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2011
- 2011-12-14 CN CN 201120523564 patent/CN202363968U/en not_active Expired - Lifetime
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| CN104102260B (en) * | 2013-04-03 | 2016-03-02 | 国民技术股份有限公司 | dual power supply system |
| CN103354415B (en) * | 2013-06-28 | 2016-01-20 | 江苏浩峰汽车附件有限公司 | A kind of for anti-reverse N-channel MOS tube grid suspension drive circuit |
| CN103354415A (en) * | 2013-06-28 | 2013-10-16 | 江苏浩峰汽车附件有限公司 | N-channel MOS tube grid electrode suspension drive circuit used to prevent reversed connection |
| CN105354168B (en) * | 2014-08-22 | 2018-09-14 | 无锡华润矽科微电子有限公司 | Realize the computer circuits structure that solar cell for supplying power automatically switches |
| CN105354168A (en) * | 2014-08-22 | 2016-02-24 | 无锡华润矽科微电子有限公司 | Calculator circuit structure for realizing solar cell power supply automatic switching |
| CN105553251A (en) * | 2016-02-02 | 2016-05-04 | 航天长峰朝阳电源有限公司 | Secondary power supply converter with electromagnetic compatibility module |
| CN107093924A (en) * | 2016-02-17 | 2017-08-25 | 山西元壹本安电源科技有限公司 | Dual power supply delays time to control double interlocking alternating stable source case with anti-interference function |
| CN107093924B (en) * | 2016-02-17 | 2023-10-13 | 洛阳申耐电力设备有限公司 | Dual-power delay control dual-interlocking alternating-current stabilized voltage supply box with anti-interference function |
| CN105703615A (en) * | 2016-04-13 | 2016-06-22 | 浪潮集团有限公司 | Anti-flow-backward design method for DC power supply redundant circuit |
| CN105790675A (en) * | 2016-05-23 | 2016-07-20 | 青岛歌尔声学科技有限公司 | Automatic leakage circuit for reverse electro-dynamic potential of motor |
| CN109301918A (en) * | 2017-07-24 | 2019-02-01 | 沈阳广合科技有限公司 | A kind of seamless switching control circuit applied to two-way V-LOCK battery |
| CN107733070B (en) * | 2017-09-11 | 2021-01-22 | 上海机电工程研究所 | Self-unlocking power conversion circuit |
| CN107733070A (en) * | 2017-09-11 | 2018-02-23 | 上海机电工程研究所 | Self solve lock power-switching circuit |
| CN110504668A (en) * | 2019-09-27 | 2019-11-26 | 苏州浪潮智能科技有限公司 | A kind of DC power supply and machine input reverse-connection preventing circuit and server |
| US11949223B2 (en) | 2019-09-27 | 2024-04-02 | Inspur Suzhou Intelligent Technology Co., Ltd. | Direct-current power supply parallel-machine input reverse connection prevention circuit and server system |
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| CN111987710A (en) * | 2020-08-11 | 2020-11-24 | 深圳市嘉润原新显科技有限公司 | Low-power-consumption backflow prevention circuit and multi-input power supply equipment |
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Granted publication date: 20120801 |