CN106100106A - Power supply switch circuit and the measuring instrument made with this circuit - Google Patents
Power supply switch circuit and the measuring instrument made with this circuit Download PDFInfo
- Publication number
- CN106100106A CN106100106A CN201610666413.2A CN201610666413A CN106100106A CN 106100106 A CN106100106 A CN 106100106A CN 201610666413 A CN201610666413 A CN 201610666413A CN 106100106 A CN106100106 A CN 106100106A
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- CN
- China
- Prior art keywords
- power supply
- circuit
- voltage
- power
- switch
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems 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
-
- Y—GENERAL 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a kind of power supply switch circuit, including power supply chip power supply unilateral diode, stand-by power supply current-limiting resistance, stand-by power supply unilateral diode, power change-over switch pipe, switching switch current-limiting resistance, and voltage detecting circuit；The input end signal of voltage detecting circuit is alternating current d. c. voltage signal after rectifying and wave-filtering, and the outfan of voltage detecting circuit is connected to the control end of power change-over switch by described switching switch current-limiting resistance.The invention also discloses the power supply switch circuit described in employing and carry out the measuring instrument of power supply switching.The power supply switch circuit that the present invention provides, it is possible to realize the seamless switching between system power supply and backup battery when alternating current power supply power down, thus improve the utilization ratio of backup battery, extends the service life of low power consuming devices.The measuring instrument that the present invention provides, standby backup battery utilization ratio is high, and equipment dependability is high, feature low in energy consumption.
Description
Technical field
Present invention relates particularly to a kind of power supply switch circuit and the measuring instrument made with this circuit.
Background technology
Along with development and the raising of people's living standard of national economy technology, automatic technology has been widely used for people
Production and life in, simultaneously also play huge effect, brought great convenience.Uninterrupted power supply technology
Because it can carry out continual electric energy supply for the power supply of equipment, therefore it is widely used in the supplier of electricity of all kinds of visual plant
Face, in the middle of the power supply of the electric-control system being also widely used in various kinds of equipment.
At present, the power supply at equipment electric-control system is primarily present, in the middle of powering, the power supply handover scheme that two classes are main.
It is illustrated in figure 1 conventional power supply switching first scheme: BAT to be used for providing standby electricity for low-power consumption lithium-Asia battery
Source voltage 3.6V, V3P3SYS be alternating current rectified after the supply voltage 3.3V that obtained by power supply chip U2 again.Power supply signal
V3P3SYS is mainly provided by the circuit described in Fig. 2, and the power supply in Fig. 2 is broadly divided into 3 grades, and the first order is after AC-DC rectification
Power supply signal (in figure indicate AC-DC-OUT), the second dc bus signal (figure acceptance of the bid after circuit filtering the most after filtering
Show VH1), the third level is the stable power supply (indicating V3P3SYS in figure) by obtaining after power supply chip.Fig. a kind, when
During alternating current power failure, V3P3SYS=0, low-power consumption battery can provide low-power dissipation power supply, maintenance system to work in low by D2 to VBB
Power consumption mode.But, there is an obvious defect in this handover scheme, it is simply that the voltage 3.6V of low-power consumption battery is more than
V3P3SYS voltage 3.3V, say, that low-power consumption battery can be powered to VBB by preferential V3P3SYS, until battery its voltage is less than
The power down switching action being outlined above could be normally realized during 3.3V.Thus cause the loss that battery is unnecessary.According to Fig. 3
Shown lithium-Asia battery discharge curve understands the discharge curve of lithium-Asia battery can become the most precipitous after voltage is less than 3.0V.Also
That is, effective discharge range of the lithium of circuit shown in Fig. 3-Asia battery only has between 3.3V-3.0V, and actual utilization ratio only has
50%。
Be illustrated in figure 4 conventional power supply switching alternative plan: this side utilize V3P3SYS control P-MOSFET conducting with
The mode turned off has evaded the problem that the BAT voltage first mentioned in scheme 1 consumes；In figure, D1 is power supply chip power supply unidirectional two
Pole is managed, and R3 is stand-by power supply current-limiting resistance, D2 stand-by power supply unilateral diode, Q1 power change-over switch pipe, R5 switching switch limit
Leakage resistance, V3P3SYS is power supply chip power supply, connects the outfan of power supply chip, and BAT is stand-by power supply, and C3 is filter capacitor.
But this handover scheme there is also serious defect, as it is shown in figure 5, in the case of room temperature 25 DEG C, P-MOSFET turn-on condition is
VGS<-1.2V, i.e. V3P3SYS voltage just begins to turn on less than P-MOSFET during 2.4V.Thus occur that vbb voltage shown in Fig. 6 is bent
Line chart (neglects tube voltage drop factor).t1Before moment, vbb voltage is 3.3V, t1Moment starts due to alternating current power failure V3P3SYS
Begin to decline and work as VGS< during-1.2V, P-MOSFET just turns on, and causes vbb voltage to decline with V3P3SYS voltage synchronous.This
Phenomenon is particularly evident after at BAT, due to long-term consumption, voltage declines.Flex point occurs at t2Moment, now V3P3SYS voltage
Fall to 2.4V, VGSVoltage reaches-1.2V, P-MOSFET and begins to turn on, and BAT starts to provide power supply to VBB, and vbb voltage starts back
Rise.Until t3Moment, P-MOSFET was fully on, and VBB is switched to BAT completely and powers.t3After moment, vbb voltage rises to BAT
Voltage 3.6V.Owing to the electric-control system of equipment existing a lot of capacitive load, t1To t2The persistent period in moment is likely to reach several
Hundred milliseconds of even second level times, so at t1To t3Between moment, have longer period of time and there will be the depression of vbb voltage
District, in this region, the electric-control system of whole equipment can enter shutdown mode.
Summary of the invention
An object of the present invention is to provide one can realize system power supply and backup electricity when alternating current power supply power down
Seamless switching between source, thus improve the utilization ratio of backup battery, the power supply in the service life extending low power consuming devices is cut
Change circuit.
The present invention you give the two of purpose be that providing a kind of applies described power supply switch circuit to be powered power supply switching
Measuring instrument.
This power supply switch circuit that the present invention provides, including power supply chip power supply unilateral diode, stand-by power supply current limliting
Resistance, stand-by power supply unilateral diode, power change-over switch pipe and switching switch current-limiting resistance, also include voltage detecting circuit；
The input end signal of voltage detecting circuit is alternating current d. c. voltage signal after rectifying and wave-filtering, voltage detecting circuit defeated
Go out end and be connected to the control end of power change-over switch by described switching switch current-limiting resistance.
Described voltage detecting circuit includes bleeder circuit and voltage checking chip, and the input pin of voltage checking chip leads to
Crossing bleeder circuit to be connected on the dc bus of power circuit, the output pin of voltage checking chip connects confession by pull-up resistor
Electrical chip power supply, is connected to the control end of power change-over switch simultaneously also by described switching switch current-limiting resistance.
The input pin of described voltage checking chip and output pin are all connected to ground by respective filter capacitor.
Described bleeder circuit is resistor voltage divider circuit.
The model of described voltage checking chip is XC61CN250MR.
Present invention also offers a kind of measuring instrument applying above-mentioned power supply switch circuit to carry out power supply switching.
This power supply switch circuit that the present invention provides, by the big your pupil of the voltage of the dc bus of detection power module
Become control signal and control the switching of power supply, judging alternating current power failure event in advance by detecting the voltage of dc bus
Arriving, during therefore the present invention can effectively solve the problem that existing power supply handover scheme, reserve battery utilization ratio is low, and power supply switched
The electric-control system caused because of voltage sag in journey quits work problem, it is possible to realize system power supply when alternating current power supply power down with standby
Seamless switching between part power supply, thus improve the utilization ratio of backup battery, extend the service life of low power consuming devices.Application
The power supply switch circuit that the present invention provides carries out the measuring instrument of power supply switching because will not occur again electric-control system stop or
The problem that reserve battery utilization rate is low, is therefore likewise supplied with backup battery utilization ratio high, and equipment dependability is high, spy low in energy consumption
Point.
Accompanying drawing explanation
Fig. 1 is the first scheme circuit theory diagrams of background technology.
Fig. 2 is the circuit theory diagrams of power supply chip power supply.
Fig. 3 is the lithium-Asia battery discharge curve schematic diagram of background technology.
Fig. 4 is the first scheme circuit theory diagrams of background technology.
Fig. 5 is VGS Yu the ID relation oscillogram of the P-MOSFET of background technology.
Fig. 6 is the vbb voltage curve synoptic diagram of background technology.
Fig. 7 is the circuit theory diagrams of the power supply switch circuit of the present invention.
Detailed description of the invention
It is illustrated in figure 7 the circuit theory diagrams of the present invention: this power supply switch circuit that the present invention provides, including for battery core
Sheet power supply unilateral diode (indicating D1 in figure), stand-by power supply current-limiting resistance (indicating R3 in figure), stand-by power supply unilateral diode
(in figure, indicating D2), power change-over switch pipe (indicating Q1 in figure), switching switch current-limiting resistance (indicating R5 in figure) and voltage inspection
Slowdown monitoring circuit；Voltage detecting circuit includes again bleeder circuit (indicating R2 and R4 in figure) and voltage checking chip (indicating U1 in figure),
The input pin of voltage checking chip is connected on the dc bus of power circuit (indicating VH1 in figure) by bleeder circuit, electricity
The output pin of pressure detection chip connects power supply chip power supply by pull-up resistor (indicating R1 in figure) and (indicates in figure
V3P3SYS), it is connected to the control end of power change-over switch also by described switching switch current-limiting resistance simultaneously；Voltage detecting core
The input pin of sheet and output pin all pass through respective filter capacitor (indicating C1 and C2 in figure) and are connected to ground.Voltage detecting core
The model of sheet is XC61CN250MR.
As in figure 2 it is shown, AC-DC-OUT is the output voltage of Switching Power Supply or transformator, through the ∏ type of C5, C6, L8 composition
Producing voltage VH1 after filter circuit, in electric energy meter circuit, VH1 voltage value is generally 8 ~ 24V.VH1 is through DC-DC blood pressure lowering chip U2
Rear formation system power supply V3P3SYS.Ensure that the input voltage of chip U2 meets requirement, then can ensure that stable output V3P3SYS
Voltage.When alternating current power failure, first VH1 magnitude of voltage can decline, and after dropping to the operating threshold voltages of U2, V3P3SYS opens
Begin to decline.Therefore the present invention is by the method detecting VH1, predicts the arrival of alternating current power failure signal in advance.U2 is dropped at VH1
Operating threshold voltages before, by the P-MOSFET in the low-power dissipation power supply switching circuit in Fig. 7 mono-open signal, it is possible to
T in perfect background technology1To t2The vbb voltage depression of period, also would not have t2To t3The power up phase of period.
Circuit shown in Fig. 7, its operation principle is: the characteristic of U1 chip is the high electricity of output when input voltage is higher than 2.5V
Flat, the output low level when input voltage is less than 2.5V.The present invention adjusts the resistance of R2, R4 so that VH1 Voltage Drop to 8V
Time, the input voltage of U1 is less than 2.5V, thus exports a low level at the V_DROP of outfan.Go with this V_DROP level
P_MOSFET in control circuit opens, thus realizes being switched on P_MOSFET before V3P3SYS falls, and solves background skill
V3P3SYS power supply and the seamless switching problem of BAT power supply in art.Simultaneously when alternating current powers on, U1 exports high level, P-
The VGS >-1.2V of MOSFET, P-MOSFET are completely switched off, and the 3.6V voltage of BAT will not be because of higher than V3P3SYS voltage 3.3V
Consumed in advance.Solve the problem that in background technology, BAT power supply is consumed in advance.
The power supply switch circuit of the present invention may be used for all types of measuring instruments, such as intelligent calorimeter, intellectual water meter,
Intelligent electric meter, intelligent gas meter etc.；Any needs that can be used for other carry out the electrical equipment of power supply switching in equipment,
Such as distribution terminal, concentrator etc..
Claims (6)
1. a power supply switch circuit, including power supply chip power supply unilateral diode, stand-by power supply current-limiting resistance, stand-by power supply list
To diode, power change-over switch pipe and switching switch current-limiting resistance, it is characterised in that also include voltage detecting circuit；Voltage is examined
The input end signal of slowdown monitoring circuit is alternating current d. c. voltage signal after rectifying and wave-filtering, and the outfan of voltage detecting circuit leads to
Cross described switching switch current-limiting resistance and be connected to the control end of power change-over switch.
Power supply switch circuit the most according to claim 1, it is characterised in that described voltage detecting circuit includes dividing potential drop electricity
Road and voltage checking chip, the input pin of voltage checking chip is connected to the dc bus of power circuit by bleeder circuit
On, the output pin of voltage checking chip connects power supply chip power supply by pull-up resistor, simultaneously also by described switching switch
Current-limiting resistance is connected to the control end of power change-over switch.
Power supply switch circuit the most according to claim 2, it is characterised in that the input pin of described voltage checking chip
All it is connected to ground by respective filter capacitor with output pin.
Power supply switch circuit the most according to claim 2, it is characterised in that described bleeder circuit is resistor voltage divider circuit.
5. according to the power supply switch circuit one of claim 1 ~ 4 Suo Shu, it is characterised in that the type of described voltage checking chip
Number it is XC61CN250MR.
6. a measuring instrument, it is characterised in that use the power supply switch circuit described in claim 1 ~ 5 to carry out power supply switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610666413.2A CN106100106A (en) | 2016-08-15 | 2016-08-15 | Power supply switch circuit and the measuring instrument made with this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610666413.2A CN106100106A (en) | 2016-08-15 | 2016-08-15 | Power supply switch circuit and the measuring instrument made with this circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106100106A true CN106100106A (en) | 2016-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610666413.2A Pending CN106100106A (en) | 2016-08-15 | 2016-08-15 | Power supply switch circuit and the measuring instrument made with this circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106100106A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465257A (en) * | 2017-09-04 | 2017-12-12 | 大唐融合通信无锡有限公司 | A kind of main power source and stand-by power supply automatic switch-over circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201032694Y (en) * | 2006-12-29 | 2008-03-05 | 金宝电子工业股份有限公司 | Dual-power supply switch circuitry |
| US20090167410A1 (en) * | 2007-12-27 | 2009-07-02 | Kiyoshi Yoshikawa | Power supply switching circuit |
| CN206060343U (en) * | 2016-08-15 | 2017-03-29 | 威胜集团有限公司 | Power supply switch circuit and with measuring instrument made by the circuit |
-
2016
- 2016-08-15 CN CN201610666413.2A patent/CN106100106A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201032694Y (en) * | 2006-12-29 | 2008-03-05 | 金宝电子工业股份有限公司 | Dual-power supply switch circuitry |
| US20090167410A1 (en) * | 2007-12-27 | 2009-07-02 | Kiyoshi Yoshikawa | Power supply switching circuit |
| CN206060343U (en) * | 2016-08-15 | 2017-03-29 | 威胜集团有限公司 | Power supply switch circuit and with measuring instrument made by the circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465257A (en) * | 2017-09-04 | 2017-12-12 | 大唐融合通信无锡有限公司 | A kind of main power source and stand-by power supply automatic switch-over circuit |
| CN107465257B (en) * | 2017-09-04 | 2024-02-13 | 大唐融合物联科技无锡有限公司 | Automatic switching circuit for main power supply and standby power supply |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161109 |
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| RJ01 | Rejection of invention patent application after publication |