CN103955148A - Circuit for achieving power supply sequential control - Google Patents
Circuit for achieving power supply sequential control Download PDFInfo
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- CN103955148A CN103955148A CN201410189738.7A CN201410189738A CN103955148A CN 103955148 A CN103955148 A CN 103955148A CN 201410189738 A CN201410189738 A CN 201410189738A CN 103955148 A CN103955148 A CN 103955148A
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- power supply
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Abstract
The invention provides a circuit for achieving power supply sequential control, and belongs to the field of power supply sequential control. The circuit for achieving power supply sequential control is composed of a time delay circuit, a comparison circuit and a negative electricity control circuit. The simple circuits are additionally arranged by ingeniously utilizing multiple integrated chips, the negative electricity time delay power supply sequential control function is achieved, the logic protection function is achieved due to the fact that a hysteresis comparator is additionally arranged, and meanwhile antijamming capacity is enhanced, so that double guarantees of the circuit for achieving power supply sequential control on the time sequence and logic are achieved.
Description
Technical field
The present invention relates to a kind of circuit of realizing power supply sequential control, belong to power supply sequential control field.
Background technology
For many years, in order to make electronic system safe, economical, durable and normally work, increasing supply voltage is monitored and control becomes very important.Especially in microwave, millimetre-wave circuit, because causing positive and negative electricity, the singularity of its chip manufacturing process has that it exclusive powers up, power-off sequential, if sequential goes wrong, can bring destructive disaster, so power supply sequencing control circuit becomes indispensable.
Conventional power source sequential control circuit is realized by two kinds of methods: a kind of is that integrated chip is realized; A kind of is to utilize discrete component to realize.
Utilize the circuit design principle that integrated chip is realized to be, employs power timing controller is controlled multiple power supplies voltage simultaneously, and its shortcoming is that power supply timing controller can only process simultaneously, control the power supply of identical polar, cannot realize the control of positive and negative electricity.
The circuit design principle of utilizing discrete component to realize is, utilize the break-make resistance of triode to differ the control of great characteristic realization to supply voltage, shortcoming is to control a road supply voltage, and there is voltage rising time problem, sequential control cannot precisely be realized, and Control of Voltage degree of accuracy is inadequate.
Summary of the invention
Technology of the present invention is dealt with problems: overcome prior art deficiency; a kind of circuit of realizing power supply sequential control is proposed; by the ingenious MAX823 house dog integrated chip that utilizes, increase ball bearing made using; realization is by the sequential control function of negative electricity time delay power supply; and increased hysteresis comparator and realized virtual protection function; also strengthened antijamming capability, thereby realized power supply sequencing control circuit dual fail-safe in sequential and in logic simultaneously.
Technical solution of the present invention: a kind of circuit of realizing power supply sequential control, it is characterized in that: comprise delay circuit (100), comparator circuit (200) and negative electricity control circuit (300), delay circuit (100) comprises house dog MAX823 chip, comparator circuit (200) comprises comparer chip LM2903, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5, negative electricity control circuit (300) comprises and door chip SN54HC21, the 6th resistance R 6, the 7th resistance R 7 and triode SMBT3904, in delay circuit (100) the VCC pin of house dog MAX823 chip and
pin is all connected with power supply positive electricity, house dog MAX823 chip
pin with negative electricity control circuit (300) is connected with 2B pin with the 2A of door chip SN54HC21, the GND pin ground connection of house dog MAX823 chip, the WDI pin of house dog MAX823 chip is unsettled, and in comparator circuit (200), GND pin, outputB pin, V-pin, the V+ pin of comparer chip LM2903 are all connected to the ground, the V-pin of comparer chip LM2903 is connected with power supply negative electricity by the first resistance R 1, and the V-pin of comparer chip LM2903 is connected with power supply positive electricity by the 4th resistance R 4, the OutputA pin of comparer chip LM2903 is connected with power supply positive electricity by the 3rd resistance R 3, simultaneously in the OutputA pin of comparer chip LM2903 and negative electricity control circuit (300) and 2C door chip SN54HC21, 2D pin is connected, the V+ pin of comparer chip LM2903 is connected with power supply positive electricity by the second resistance R 2, and the V+ pin of comparer chip LM2903 is connected to the ground by the 5th resistance R 5, in negative electricity control circuit (300) and 1A door chip SN54HC21, 1B, 1C, 1D, 1Y, GND pin is connected to the ground, be connected with power supply positive electricity with the Vcc pin of door chip SN54HC21d, unsettled with two NC pins of door chip SN54HC21, the one end that is connected the 6th resistance R 6 with the 2Y pin of door chip SN54HC21, the other end one tunnel of the 6th resistance R 6 connects one end of the 7th resistance R 7, the b pin of another road connecting triode SMBT3904, the other end of the 7th resistance R 7 is connected to the ground, the e pin of triode SMBT3904 is connected to the ground, c pin is power-electric control output.
The present invention compared with prior art tool has the following advantages:
(1) by utilizing integrated chip to realize the time delay of control supply voltage, export, compare with discrete component and greatly reduce whole power supply sequencing control circuit crash rate.
(2) power supply sequencing control circuit building with traditional integrated chip is compared, and the present invention can realize plus-minus electric control simultaneously.
(3) the present invention, by the correct powering order of sequential and the logic two dual assurance circuit in aspect, guarantees circuit devcie safety.
Accompanying drawing explanation
Fig. 1 is power supply sequencing control circuit schematic diagram of the present invention.
Embodiment
Basic ideas of the present invention are: according to the requirement to the positive negative electricity electrifying timing sequence of power supply in electronic system; improve comparator circuit and negative electricity control circuit; and increased the delay circuit that utilizes watchdog chip to build; power supply sequencing control circuit of the present invention can be realized Electricity Functional in the virtual protection function of positive electricity, negative electricity and negative electricity time delay; also strengthened the antijamming capability to power supply ripple, thereby realized power supply sequencing control circuit dual fail-safe in sequential and in logic simultaneously.
As shown in Figure 1, the present invention utilizes sequential relationship between MAX823 house dog integrated chip pin to realize the sequential control of positive electricity, negative electricity; By hysteresis comparator, realize the virtual protection function of positive electricity, negative electricity; By AND circuit, realize line and function, finally utilize triode to realize low and high level translation function and export positive electric control signal control high-current switch.
A kind of circuit of realizing power supply sequential control, comprise delay circuit 100, comparator circuit 200 and negative electricity control circuit 300, delay circuit 100 comprises house dog MAX823 chip, comparator circuit 200 comprises comparer chip LM2903, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5, and negative electricity control circuit 300 comprises and door chip SN54HC21, the 6th resistance R 6, the 7th resistance R 7 and triode SMBT3904.
In delay circuit 100 the VCC pin of house dog MAX823 chip and
pin is all connected with power supply positive electricity, house dog MAX823 chip
pin with negative electricity control circuit 300 is connected with 2B pin with the 2A of door chip SN54HC21, the GND pin ground connection of house dog MAX823 chip, in comparator circuit 200, the GND pin of comparer chip LM2903, outputB pin, V-pin, V+ pin are all connected to the ground, the V-pin of comparer chip LM2903 is connected with power supply negative electricity by the first resistance R 1, and the V-pin of comparer chip LM2903 is connected with power supply positive electricity by the 4th resistance R 4, the OutputA pin of comparer chip LM2903 is connected with power supply positive electricity by the 3rd resistance R 3, simultaneously in the OutputA pin of comparer chip LM2903 and negative electricity control circuit 300 and 2C door chip SN54HC21, 2D pin is connected, the V+ pin of comparer chip LM2903 is connected with power supply positive electricity by the second resistance R 2, and be connected to the ground by the 5th resistance R 5, in negative electricity control circuit 300 and 1A door chip SN54HC21, 1B, 1C, 1D, 1Y, GND pin is connected to the ground, be connected with power supply positive electricity with the Vcc pin (20 pin) of door chip SN54HC21d, unsettled with two NC pins of door chip SN54HC21, the one end that is connected the 6th resistance R 6 with the 2Y pin of door chip SN54HC21, the other end one tunnel of the 6th resistance R 6 connects one end of the 7th resistance R 7, the b pin of another road connecting triode SMBT3904, the other end of the 7th resistance R 7 is connected to the ground, the e pin of triode SMBT3904 is connected to the ground, c pin is power-electric control output.
The sequential function of inner each pin of house dog MAX823 chip MAX823 (chronotron chip) is: when
pin sets high level, WDI pin is unsettled while arranging,
pin level value will be after time delay 140ms in the output of VCC pin, thereby realize after sending into the positive electricity time delay 140ms of house dog MAX823 chip MAX823 (chronotron chip), export, and be high level.
Sending into the positive electricity of the V+ pin of comparer chip LM2903 compares with the negative electricity of sending into the V-pin of comparer chip LM2903, if negative electricity exists (being that negative electricity has powered on), the outputA pin of comparer chip LM2903 is output as high level.
With the built-in function of door chip SN54HC21 be: when 2C, 2D pin are high level, 2Y pin is output as high level.
Output pin using the c pin with door chip SN54HC21 as this sequential control functional module, triode chip built-in function is: when b pin is high level, c pin is output as low level.
To sum up, after existing (being that negative electricity has powered on) and positive electricity time delay 140ms, exports power supply negative electricity, the VCC pin that the outputA pin of comparer chip LM2903 is output as high level, chronotron chip MAX823 is output as high level, so latter two high level is sent to and door chip SN54HC21, make to be output as high level with the 2Y pin of door chip SN54HC21, the b pin of last triode is high level, make c pin be output as low level, thereby control the switch opens of external power source system, the logic that realizes the positive and negative electricity of power supply guarantees and sequential control.
Non-elaborated part of the present invention belongs to techniques well known.
Claims (1)
1. a circuit of realizing power supply sequential control, it is characterized in that: comprise delay circuit (100), comparator circuit (200) and negative electricity control circuit (300), delay circuit (100) comprises house dog MAX823 chip, comparator circuit (200) comprises comparer chip LM2903, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5, negative electricity control circuit (300) comprises and door chip SN54HC21, the 6th resistance R 6, the 7th resistance R 7 and triode SMBT3904, in delay circuit (100) the VCC pin of house dog MAX823 chip and
pin is all connected with power supply positive electricity, house dog MAX823 chip
pin with negative electricity control circuit (300) is connected with 2B pin with the 2A of door chip SN54HC21, the GND pin ground connection of house dog MAX823 chip, the WDI pin of house dog MAX823 chip is unsettled, and in comparator circuit (200), GND pin, outputB pin, V-pin, the V+ pin of comparer chip LM2903 are all connected to the ground, the V-pin of comparer chip LM2903 is connected with power supply negative electricity by the first resistance R 1, and the V-pin of comparer chip LM2903 is connected with power supply positive electricity by the 4th resistance R 4, the OutputA pin of comparer chip LM2903 is connected with power supply positive electricity by the 3rd resistance R 3, simultaneously in the OutputA pin of comparer chip LM2903 and negative electricity control circuit (300) and 2C door chip SN54HC21, 2D pin is connected, the V+ pin of comparer chip LM2903 is connected with power supply positive electricity by the second resistance R 2, and the V+ pin of comparer chip LM2903 is connected to the ground by the 5th resistance R 5, in negative electricity control circuit (300) and 1A door chip SN54HC21, 1B, 1C, 1D, 1Y, GND pin is connected to the ground, be connected with power supply positive electricity with the Vcc pin of door chip SN54HC21d, unsettled with two NC pins of door chip SN54HC21, the one end that is connected the 6th resistance R 6 with the 2Y pin of door chip SN54HC21, the other end one tunnel of the 6th resistance R 6 connects one end of the 7th resistance R 7, the b pin of another road connecting triode SMBT3904, the other end of the 7th resistance R 7 is connected to the ground, the e pin of triode SMBT3904 is connected to the ground, c pin is power-electric control output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410189738.7A CN103955148B (en) | 2014-05-06 | 2014-05-06 | A kind of circuit realizing power supply sequencing contro |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410189738.7A CN103955148B (en) | 2014-05-06 | 2014-05-06 | A kind of circuit realizing power supply sequencing contro |
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| CN103955148A true CN103955148A (en) | 2014-07-30 |
| CN103955148B CN103955148B (en) | 2017-01-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188941A (en) * | 2018-09-14 | 2019-01-11 | 北京空间机电研究所 | The hard sequential control circuit of space remote sensing camera CCD power supply |
| CN113920959A (en) * | 2021-09-16 | 2022-01-11 | 深圳市航盛电子股份有限公司 | Vehicle-mounted display screen programmable control device and vehicle-mounted display screen |
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| CN1510427A (en) * | 2002-12-23 | 2004-07-07 | 华为技术有限公司 | Electric power on/off module |
| JP2006230188A (en) * | 2005-01-18 | 2006-08-31 | Beru Ag | Method of operating power consuming material |
| CN101344766A (en) * | 2008-08-22 | 2009-01-14 | 安徽奥马特汽车变速系统有限公司 | Power-off time-delay mechanism of electric-controlled unit for car |
| CN201248033Y (en) * | 2008-08-25 | 2009-05-27 | 青岛海信电器股份有限公司 | Sequence control circuit and television set with the circuit |
| JP2011182537A (en) * | 2010-03-01 | 2011-09-15 | Murata Mfg Co Ltd | Switching control circuit and switching power supply device |
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2014
- 2014-05-06 CN CN201410189738.7A patent/CN103955148B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1510427A (en) * | 2002-12-23 | 2004-07-07 | 华为技术有限公司 | Electric power on/off module |
| JP2006230188A (en) * | 2005-01-18 | 2006-08-31 | Beru Ag | Method of operating power consuming material |
| CN101344766A (en) * | 2008-08-22 | 2009-01-14 | 安徽奥马特汽车变速系统有限公司 | Power-off time-delay mechanism of electric-controlled unit for car |
| CN201248033Y (en) * | 2008-08-25 | 2009-05-27 | 青岛海信电器股份有限公司 | Sequence control circuit and television set with the circuit |
| JP2011182537A (en) * | 2010-03-01 | 2011-09-15 | Murata Mfg Co Ltd | Switching control circuit and switching power supply device |
Non-Patent Citations (2)
| Title |
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| 肖伟权: "LM3881在电源时序控制方面的应用", 《技术应用》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188941A (en) * | 2018-09-14 | 2019-01-11 | 北京空间机电研究所 | The hard sequential control circuit of space remote sensing camera CCD power supply |
| CN113920959A (en) * | 2021-09-16 | 2022-01-11 | 深圳市航盛电子股份有限公司 | Vehicle-mounted display screen programmable control device and vehicle-mounted display screen |
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| Publication number | Publication date |
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| CN103955148B (en) | 2017-01-04 |
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