CN1310396C - Power supply switching circuit for detection - Google Patents

Power supply switching circuit for detection Download PDF

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Publication number
CN1310396C
CN1310396C CNB021259224A CN02125922A CN1310396C CN 1310396 C CN1310396 C CN 1310396C CN B021259224 A CNB021259224 A CN B021259224A CN 02125922 A CN02125922 A CN 02125922A CN 1310396 C CN1310396 C CN 1310396C
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CN
China
Prior art keywords
circuit
power supply
detection
semiconductor
oxide
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Expired - Lifetime
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CNB021259224A
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CN1472864A (en
Inventor
李瑞莲
丁杰
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems

Abstract

The present invention relates to a power supply detection switching circuit which comprises a detection sampling circuit and a diverter switch circuit, wherein an input terminal of the detection sampling circuit is connected with a detected power supply, and an output terminal is used for outputting a control signal; an input terminal of the diverter switch circuit is connected with the output terminal of the detection sampling circuit and receives the control signal output by the detection sampling circuit, and the other two terminals are connected with a load loop in series for switching a power supply which is connected with the load. By using the detection diverter switch circuit of the present invention, when a certain power supply does not work, a power supplying loop can be rapidly and reliably switched to a standby power supply loop; at the instant moment of switching, a system is not powered off, so the normal work of the system is not influenced.

Description

A kind of power supply switching circuit for detection
Technical field
The present invention relates to electronic circuit field, relate in particular to a kind of power supply switching circuit for detection.
Technical background
In the communications field, the uninterrupted power supply of communication system is that communication system is normal, the most basic assurance of stable operation, the Secondary Power Module that the existing communication system uses, and its MTBF is generally between 1500Khours-5000KHours.Though this Secondary Power Module has higher reliability, but for when accident occurring, what still can guarantee to power is uninterrupted, industry is design one standby system in system normally, secondary power supply is backed up, when losing efficacy, guarantee the operate as normal of system with certain (a bit) modular power source in system.
In the prior art, the main mode of power supply backup comprises Hot Spare and cold standby, and Hot Spare is meant and is equal power supply of each power supply backup that with working power use parallel with one another, be actually two power supplys like this and work simultaneously, cost is higher relatively.Cold standby is meant and is the equal power supply of a plurality of power supply backups that this backup battery and working power are connected in parallel, when the working power operate as normal, this backup battery loop disconnects, when working power went wrong, backup battery was connected the loop, and the problem power supply of taking over is the service board power supply.
As seen, cold standby can reduce cost compared to Hot Spare, but in existing cold standby technology, but the neither one technical scheme can be when working power breaks down, guarantee backup battery can be rapidly, connect effectively, and then reduced the reliability of cold standby system widely, influenced the normal operation of whole communication system.
Summary of the invention
The present invention is exactly at above situation, proposes a kind ofly can connect the detection commutation circuit in stand-by power supply loop rapidly when power supply breaks down.
Power supply switching circuit for detection of the present invention, it is characterized in that comprising detection sample circuit and switching switch circuit, described detection sample circuit has an input, connect detected power supply, an output is arranged, be used for exporting control signal, an input of described switching switch circuit is connected in the output that detects sample circuit, receive the control signal that detects sample circuit output, serial connection load circuit in two ends is used to switch the power supply that connects load in addition.
Described switching switch circuit comprises metal-oxide-semiconductor Q4, resistance R 2 and the diode D4 of connection parallel with one another, the source electrode of described metal-oxide-semiconductor Q4 and the load of drain electrode serial connection, and gate pole receives the control signal that detects the sample circuit input.
Described metal-oxide-semiconductor Q4 is the metal-oxide-semiconductor of P raceway groove.
Described power supply switching circuit for detection also comprises a soft-start circuit, and described soft-start circuit is serially connected with between the drain electrode and stand-by power supply of switching switch circuit.
Described soft-start circuit comprises resistance R 6 and the R7 that is connected in series, with the R6 capacitor C that is connected 1 parallel with one another, diode D3 and metal-oxide-semiconductor Q3, wherein, the drain electrode of this metal-oxide-semiconductor Q3 links to each other with the drain electrode of metal-oxide-semiconductor Q4, one end and the resistance R 6 of resistance R 7 are connected in series other end ground connection.
Described metal-oxide-semiconductor Q3 is the metal-oxide-semiconductor of P raceway groove.
Described detection sample circuit comprises a sample circuit and processing unit, and described sample circuit is gathered voltage signal, inputs to processing unit, and processing unit compares sampled signal, the output control signal.
Described processing unit is the detection chip with a reference source.
Described sample circuit comprises sampling resistor R12 and the R13 that is connected in series, and the tie point output sampled signal of R12 and R13 is given the input of detection chip.
Described power supply switching circuit for detection also comprises a storage capacitor C, and this storage capacitor C one end connects load, and other end ground connection is used for powering to the load in handoff procedure.
By detection switching switch circuit of the present invention, can be when certain power-fail, the circuit of being powered by fallback circuit can switch to fast and reliable stand-by power supply, switches moment not power down of system, does not influence the operate as normal of system.
Description of drawings
Fig. 1 is the circuit diagram of power supply switching circuit for detection of the present invention;
Fig. 2 is in the one embodiment of the invention, the connection diagram of power supply switching circuit for detection and backup battery and working power.
Fig. 3 is in the embodiment of the invention, concrete circuit diagram.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
As shown in Figure 1, power supply switching circuit for detection of the present invention comprises detection sample circuit and switching switch circuit and a soft-start circuit.Among Fig. 1, F represents backup battery loop fuse, and R1, R3 represent resistance, and A represents the tie point in main current supply circuit and backup loop.
This switching switch circuit comprises metal-oxide-semiconductor Q4, resistance R 2 and the diode D4 of connection parallel with one another, and the source electrode of metal-oxide-semiconductor Q4 and drain electrode serial connection load circuit are used to switch the power supply that connects load, and the gate pole of metal-oxide-semiconductor Q4 receives the control signal that detects the sample circuit input.
This detection sample circuit has an input, connects detected power supply, and an output is arranged, and is used for exporting control signal and gives switching switch circuit.
This detection sample circuit comprises a sample circuit and processing unit, this processing unit is the detection chip with a reference source, this detection chip can have multiple, comparator with a reference source can adopt in the present invention, such as the detection chip U1 (as shown in Figure 3) of the model of using in the present embodiment as MC33161.The detection chip MC33161 that present embodiment uses has 4 pins, is respectively input, output pin and power pins and grounding pin, and output pin is connected the gate pole of metal-oxide-semiconductor Q4, when circuit working, a threshold value is set earlier, this plate output voltage is sampled, and deliver to 3 pin of detection chip by sample circuit, when output is lower than preset threshold, 5 pin of detection chip are reversed to low level by high level, finish detection, and the output switching signal, give switching circuit, connect backup battery.
In the circuit diagram of concrete power supply switching circuit for detection shown in Figure 3, between main power source and load circuit, adopt diode D1 to isolate, when primary source failure, just can not influence the power supply of backup battery and load like this, detection chip U1 also only controls the switch of backup battery simultaneously.
This sample circuit comprises sampling resistor R12 and the R13 that is connected in series, the end ground connection of R12, form the loop, the tie point output sampled signal of R12 and R13 is given the input of detection chip, this sample circuit is gathered detected power source voltage signal, and inputing to processing unit, processing unit compares sampled signal, the output control signal.
This soft-start circuit comprises resistance R 6 and the R7 that is connected in series, with the R6 capacitor C that is connected 1 parallel with one another, diode D3 and metal-oxide-semiconductor Q3, wherein, the drain electrode of this metal-oxide-semiconductor Q3 links to each other with the drain electrode of metal-oxide-semiconductor Q4, and this soft-start circuit is serially connected with between switching switch circuit and the backup battery.This soft-start circuit control metal-oxide-semiconductor Q3 slowly opens sparking when avoiding power supply to switch.
In the present embodiment, above-mentioned metal-oxide-semiconductor Q3 and Q4 can adopt the metal-oxide-semiconductor of N raceway groove, also can adopt the metal-oxide-semiconductor of P raceway groove, if adopt the metal-oxide-semiconductor of N raceway groove, because the metal-oxide-semiconductor of N raceway groove need guarantee that when conducting G, S the two poles of the earth are positive voltages, need add an extra high voltage in the G level in circuit.If adopt the metal-oxide-semiconductor of P raceway groove, because the metal-oxide-semiconductor of P raceway groove need guarantee that when conducting G, S the two poles of the earth are negative voltages, in circuit, G level ground connection is got final product, can avoid introducing new driving voltage.Present embodiment adopts the metal-oxide-semiconductor of the lower P raceway groove of pressure drop.
This detection commutation circuit also comprises a storage capacitor C, and this storage capacitor C one end connects load, and other end ground connection is used for powering to the load in handoff procedure.
As shown in Figure 2, it is the concrete application of power supply switching circuit for detection of the present invention, this circuit application is in a veneer electric power system, this system is made of several business boards, each business board has a DC/DC power supply, is used for changing the direct voltage of high-low pressure bus input into direct voltage that veneer needs, and providing voltage such as the possibility bus is 48 volts, and the operating voltage that veneer when operation needs is 5 volts, and it be 5 volts operating voltage that this DC/DC gets final product these 48 volts of voltage transitions.By a backup DC/DC power supply, to all the DC/DC power supply backups on the business board.If the DC/DC power supply of business board goes wrong, power supply switching circuit for detection is connected this backup battery loop at once, finishes the connection work in backup battery loop, does not influence the operate as normal of business board.
By power supply switching circuit for detection of the present invention, can make backup battery be in light condition substantially, temperature rise is lower, and reliability improves relatively.When certain (a bit) modular power source lost efficacy, the circuit of being powered by its can switch to fast and reliable stand-by power supply, switched moment not power down of system, did not influence the operate as normal of system.
While is owing to the P channel MOS tube that has used low pressure drop, so pressure drop is lower.Among the present invention, two metal-oxide-semiconductor Q3, Q4 of P raceway groove are used relatively, under the situation of not using diode, reached purpose backup battery and this plate isolated from power.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims (9)

1, a kind of power supply switching circuit for detection, it is characterized in that comprising detection sample circuit, switching switch circuit and soft-start circuit, described detection sample circuit has an input, connect detected power supply, an output is arranged, be used for exporting control signal, an input of described switching switch circuit is connected in the output that detects sample circuit, receive the control signal that detects sample circuit output, serial connection load circuit in two ends is used to switch the power supply that connects load in addition; Described soft-start circuit is serially connected with commutation circuit and leaks between level and the stand-by power supply.
2, power supply switching circuit for detection as claimed in claim 1, it is characterized in that described switching switch circuit comprises first metal-oxide-semiconductor (Q4), first resistance (R2) and first diode (D4) of connection parallel with one another, the source electrode of described first metal-oxide-semiconductor (Q4) and the load of drain electrode serial connection, gate pole receives the control signal that detects the sample circuit input.
3, power supply switching circuit for detection as claimed in claim 2 is characterized in that described first metal-oxide-semiconductor (Q4) is the metal-oxide-semiconductor of P raceway groove.
4, power supply switching circuit for detection as claimed in claim 1, it is characterized in that described soft-start circuit comprises second resistance (R6) and the 3rd resistance (R7) that is connected in series, with second resistance (R6), first electric capacity (C1) that is connected parallel with one another, second diode (D3) and second metal-oxide-semiconductor (Q3), wherein, the drain electrode of this second metal-oxide-semiconductor (Q3) links to each other with the drain electrode of first metal-oxide-semiconductor (Q4), one end of the 3rd resistance (R7) and second resistance (R6) are connected in series other end ground connection.
5, power supply switching circuit for detection as claimed in claim 4 is characterized in that described second metal-oxide-semiconductor (Q3) is the metal-oxide-semiconductor of P raceway groove.
6, power supply switching circuit for detection as claimed in claim 1, it is characterized in that described detection sample circuit comprises a sample circuit and processing unit, described sample circuit is gathered voltage signal, inputs to processing unit, processing unit compares sampled signal, the output control signal.
7, power supply switching circuit for detection as claimed in claim 6 is characterized in that described processing unit is the detection chip with a reference source.
8, power supply switching circuit for detection as claimed in claim 7, it is characterized in that described sample circuit comprises first sampling resistor (R12) and second sampling resistor (R13) that is connected in series, the tie point output sampled signal of first sampling resistor (R12) and second sampling resistor (R13) is given the input of detection chip.
9, power supply switching circuit for detection as claimed in claim 1 is characterized in that described detection commutation circuit also comprises a storage capacitor (C), and this storage capacitor (C) end connects load, and other end ground connection is used for powering to the load in handoff procedure.
CNB021259224A 2002-08-02 2002-08-02 Power supply switching circuit for detection Expired - Lifetime CN1310396C (en)

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Application Number Priority Date Filing Date Title
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WO2009059516A1 (en) * 2007-10-29 2009-05-14 Chengdu Huawei Symantec Technologies Co., Ltd. Device and method for controlling switch of main power supply and backup power supply

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CN100390686C (en) * 2004-04-21 2008-05-28 华为技术有限公司 System for identifying single board redundant power supply
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CN103138376B (en) * 2011-11-25 2015-04-29 环旭电子股份有限公司 Power switching circuit and power switching method thereof
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CN106787130B (en) * 2016-12-20 2019-08-02 深圳市元征科技股份有限公司 A kind of power supply switch circuit and terminal
US10483794B2 (en) 2017-06-28 2019-11-19 Nanning Fugui Precision Industrial Co., Ltd. Power continuation control circuit
CN107589334B (en) * 2017-09-08 2021-05-18 郑州云海信息技术有限公司 Power failure test method and device for power supply module
CN108874009A (en) * 2018-07-25 2018-11-23 郑州云海信息技术有限公司 A kind of method, controller and the system of dynamic adaptation load
CN109347085A (en) * 2018-12-06 2019-02-15 福建宏宇电子科技有限公司 A kind of circuit carrying out one-to-many communication using DC power system
CN111077764B (en) * 2019-11-26 2023-10-20 山东航天电子技术研究所 Cold and hot standby load cross control method and circuit with power-on and reset
CN111817393B (en) * 2020-07-17 2022-06-28 上海布鲁可积木科技有限公司 Charging and communication switching circuit capable of charging networking structure between paired pieces

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