CN106451736A - Power switching circuit capable of setting power priority and power switching method - Google Patents
Power switching circuit capable of setting power priority and power switching method Download PDFInfo
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- CN106451736A CN106451736A CN201611008797.5A CN201611008797A CN106451736A CN 106451736 A CN106451736 A CN 106451736A CN 201611008797 A CN201611008797 A CN 201611008797A CN 106451736 A CN106451736 A CN 106451736A
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- power supply
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- diode
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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/36—Arrangements using end-cell switching
Abstract
The invention discloses a power switching circuit capable of setting power priority and a power switching method. The power switching circuit comprises a control circuit and a switching circuit, wherein an MCU performs state control on a triode of the switching circuit through the control circuit. The problem that the priority of power supply cannot be changed when an intelligent ammeter is powered by two independent power supplies at the same time can be effectively solved. Compared with a dedicated power chip, the power switching circuit disclosed by the invention has high universality, and the switch of power priority can be effectively realized without using a dedicated power chip. The power switching circuit disclosed by the invention has the advantages of low cost and easiness in maintenance, and a large number of the power switching circuits can be conveniently applied; and the power switching circuit with low cost and settable priority can be applied to most of existing power systems.
Description
Technical field
The present invention relates to a kind of power supply switch circuit of the electric energy meter with two road independent power supplies, it is particularly suited for two
Planting power supply output has differential pressure requirements, priority can arrange, and the occasion that can switch in real time.
Background technology
Need for electricity with industry, agriculture, business and resident living in social life is growing, and people are to electric energy
Transaction increasingly frequent, electric energy meter is the measurement instrument weighing power trade number, and it is technical to require very high, more requires accurately
With stable, and ensure reliably and with long-term.The wherein intelligent electric energy meter with accessory power supply, has main power source power supply and two kinds of confessions of accessory power supply
Electrically, two kinds of power supply modes are separate.In order to meet the demand of various users it is desirable to we are excellent to two kinds of power supplies
Being configured of first level, and realize automatically switching.
At present, on market, most of intelligent electric energy meters with accessory power supply are all that accessory power supply is preferentially powered.General sets
Meter is all that the output voltage of accessory power supply is higher than the output voltage of main power source, and the output voltage due to two kinds of supply voltages exists
Certain voltage difference, so two kinds of power supplys can be easily achieved the preferential confession of accessory power supply by the competitive way of diode
Electricity.But the priority of some customer requirement two-way power supplys can be arranged according to demand in real time.So single auxiliary electricity
The mode of the preferential power supply in source can not meet the market demand.
Content of the invention
The problem to be solved in the present invention be provide a kind of two kinds of power supplys simply can be set power the switching circuit of priority,
When making electric energy meter work, can as requested the priority of first via power supply and the second road power supply be arranged in real time, and
Realize the automatic seamless switching of power supply, impact is not produced on the working condition of ammeter simultaneously.
The present invention proposes a kind of power supply switch circuit arranging power supply priority, and it includes control circuit and switching electricity
Road, MCU carries out state control by control circuit to the audion of switching circuit；Described switching circuit includes the first audion
Q1, the second audion Q2, the 3rd audion Q3, first resistor R1, second resistance R2, the 5th resistance R5 and stabilivolt D4, described
First audion Q1 and the second audion Q2 is PNP type triode, and described 3rd audion Q3 is NPN type triode, the one or three
The emitter stage of pole pipe Q1 connects the second road power supply U2, and the colelctor electrode of the first audion Q1 connects load end, first via power supply U1
Connect load end, the base stage of the first audion Q1 connects the emitter stage of the second audion Q2 and the current collection of the 3rd audion Q3 respectively
Pole, the colelctor electrode of the second audion Q2 and the grounded emitter of the 3rd audion Q3, the base stage of the 3rd audion Q3 connects MCU's
Control signal VAUX_CTL；First resistor R1, second resistance R2 and the 5th resistance R5 constitute series connection bleeder circuit：Second resistance R2
It is connected between first via power supply U1 and divider node, first resistor R1 is connected between the second road power supply U2 and divider node,
5th resistance R5 is connected between divider node and ground, and divider node is connected with the base stage of the second audion Q2 through stabilivolt D4.
Described switching circuit also includes the first diode D1, the second diode D2, the 3rd diode D3, the 5th diode
D5,3rd resistor R3, the 4th resistance R4, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8, physical circuit connects is：
First via power supply U1 mono- aspect connects the anode of the first diode D1, on the other hand passes through second resistance R2 and connects surely
The anode of pressure pipe D4；The anode of stabilivolt D4 passes through the 5th resistance R5 ground connection；The negative electrode of the first diode D1 connects the one of load
End；
Second road power supply U2 connects the anode of the second diode D2, and the negative electrode of the second diode D2 is divided into three branch roads：
Tie point connects the anode of stabilivolt D4 by first resistor R1, and the second branch road passes through the 8th resistance R8 and connects the
The base stage of one audion Q1, the 3rd branch road connects the emitter stage of the first audion Q1；
The colelctor electrode of the first audion Q1 connects the anode of the 3rd diode D3, and the negative electrode of the 3rd diode D3 connects load
The other end；
The base stage of the first audion Q1 connects the emitter stage of the second audion Q2 also by 3rd resistor R3；Second audion
The base stage of Q2 connects the anode of the 5th diode D5, and the negative electrode of the 5th diode D5 connects the negative electrode of stabilivolt D4；Two or three pole
The grounded collector of pipe Q2；
The base stage of the first audion Q1 connects the colelctor electrode of the 3rd audion Q3, the 3rd audion also by the 4th resistance R4
The grounded emitter of Q3, the base stage of the 3rd audion Q3 passes through control signal VAUX_CTL that the 6th resistance R6 connects MCU, MCU
Control signal VAUX_CTL be grounded also by the 7th resistance R7.
The invention also discloses a kind of power-supply switching method based on described power supply switch circuit, the control signal of MCU
VAUX_CTL connects the base stage of the 3rd audion Q3, and the height of control signal VAUX_CTL determines the break-make of the 3rd audion Q3,
The series connection bleeder circuit that first resistor R1, second resistance R2 and the 5th resistance R5 are constituted determines that can the first audion Q1 by the
Two audion Q2 carry out open-minded.
Specifically, it includes following switch mode：
(1), when first via power supply U1 powers that preferential and two-way power supply is powered simultaneously, control signal VAUX_CTL is low level,
The base voltage reaching the 3rd audion Q3 is also low level, and the 3rd audion Q3 can be cut off, and the first audion Q1 cannot
Turned on by the 3rd audion Q3；Because the partial pressure of second resistance R2 and the 5th resistance R5 can make the base stage electricity of the second audion Q2
Pressure is relatively low with the voltage difference of the emitter stage of the first audion Q1, such first audion Q1 nor by the second audion Q2
Conducting, so the second road power supply U2 cannot will pass through the first diode D1 to load supplying below, first via power supply U1
To load supplying below, so first via power supply can preferentially be powered；
(2) first via power supply powers U1 when powering that preferential and the only second road power supply U2 individually powers, control signal VAUX_
CTL is low level, and the base stage of the 3rd audion Q3 will be low, and the 3rd audion Q3 will be turned off, and the first audion Q1 is just
Can not be by the 3rd audion Q3 conducting, the partial pressure of first resistor R1 and the 5th resistance R5 can make the base stage electricity of the second audion Q2
Pressure is higher with the voltage difference of the emitter stage of the first audion Q1, and the first audion Q1 just can be turned on by the second audion Q2,
Second road power supply U2 just can be by the first audion Q1 and the 3rd diode D3 to load supplying below；
(3) second road power supply U2 power preferentially and two-way power supply is powered simultaneously, and control signal VAUX_CTL is high level, the
The base stage of three audion Q3 will be height, and the 3rd audion Q3 will be switched on, due to the emitter voltage of the first audion Q1
Higher, the first audion Q1 just will can pass through the first audion Q1 by the 3rd audion Q3 conducting, the second road power supply U2, the
The collector voltage of one audion Q1 is higher than the output voltage of first via power supply U1, so the second road power supply can preferentially be powered；
When (4) second road power supply U2 power preferentially and only first via power supply U1 individually powers, control signal VAUX_CTL
For high level, the second road power supply U2 is output as 0, and the first audion Q1 emitter voltage is also 0, and the first audion Q1 can turn off,
The collector voltage of the first audion Q1 is also 0, and first via power supply U1 is higher than the collector voltage of the first audion Q1, so the
One road power supply U1 will be by the first diode D1 to load supplying below.
Beneficial effects of the present invention
The power supply switch circuit arranging two kinds of power supply priority of the present invention effectively solves the seamless switching of power supply
Problem, can flexibly be arranged according to demand, and whichever power supply is preferentially powered, and does not affect the normal work of ammeter.This
Circuit in invention is simple, low cost, and small power consumption is practical, easily realizes the setting of power supply switching and priority, to two-way
The differential pressure requirements of electric power output voltage are also low, can very easily put into a large amount of uses.Power supply switch circuit in invention is permissible
In the power-supply system that the most of two-way power supplys being applied to presently, there are are powered.
Brief description
Fig. 1 is the theory diagram of the power supply switch circuit that can arrange power supply priority
Fig. 2 is the actual principle figure of power supply switch circuit
Simulation result figure when Fig. 3 powers preferentially for first via power supply and two power supplys are powered simultaneously
Simulation result figure when Fig. 4 powers preferentially for first via power supply and the second road power supply is individually powered
Fig. 5 is simulation result figure when the second road power supply is powered preferentially and two power supplys are powered simultaneously
Fig. 6 is simulation result figure when the second road power supply is powered preferentially and first via power supply is individually powered
Specific embodiment
With reference to embodiment, the invention will be further described, but protection scope of the present invention not limited to this：
In conjunction with shown in Fig. 1, for the theory diagram of the power supply switch circuit of power supply priority can be arranged, in duplex feeding power supply
Between add a control circuit and switching circuit, then can by MCU be given control signal VAUX_CTL control switching circuit, switching
Circuit can control corresponding power supply to power preferentially according to this signal by a series of change of level.The feature of switching circuit is
Audion and suitable resistance using several low costs are controlled to the priority of power supply.When needing to power supply
Priority when making a change, circuit design need not be changed it is only necessary to MCU exports a level signal, just can reach control confession
The purpose of power supply priority, affects state when a certain road power supply is individually powered simultaneously and not.So effectively solving makes
With common power supply switch circuit, the unalterable problem of power supply priority.
In conjunction with Fig. 2, give the physical circuit figure of power supply switch circuit, herein as content of the invention describes, therefore repeat no more.
The invention also discloses a kind of power-supply switching method based on power supply switch circuit shown in Fig. 2, the control signal of MCU
VAUX_CTL connects the base stage of the 3rd audion Q3, and the height of control signal VAUX_CTL determines the break-make of the 3rd audion Q3,
The series connection bleeder circuit that first resistor R1, second resistance R2 and the 5th resistance R5 are constituted determines that can the first audion Q1 by the
Two audion Q2 carry out open-minded.
Specifically, it includes following switch mode：
(1), when first via power supply U1 powers that preferential and two-way power supply is powered simultaneously, control signal VAUX_CTL is low level,
The base voltage reaching the 3rd audion Q3 is also low level, and the 3rd audion Q3 can be cut off, and the first audion Q1 cannot
Turned on by the 3rd audion Q3；Because the partial pressure of second resistance R2 and the 5th resistance R5 can make the base stage electricity of the second audion Q2
Pressure is relatively low with the voltage difference of the emitter stage of the first audion Q1, such first audion Q1 nor by the second audion Q2
Conducting, so the second road power supply U2 cannot will pass through the first diode D1 to load supplying below, first via power supply U1
To load supplying below, so first via power supply can preferentially be powered.In conjunction with Fig. 3, simulation result in figure：First via power supply U1 is
13V, the second road power supply U2 are 16V, and U1 powers preferentially, and when U1 and U2 powers simultaneously, now power control signal should be low level,
Here substituted with switching signal, voltage is 0V.Reaching the 3rd audion Q3 base voltage is 0V, and the 3rd audion Q3 is cut off,
First audion Q1 cannot be turned on by the 3rd audion Q3, and the voltage got of second resistance R2 and the 5th resistance R5 be
11.8V, due to this overtension, leads to the first audion Q1 and the second audion Q2 to be cut off, such second road power supply
U2 cannot be to load supplying below, and first via power supply U1 passes through the first diode D1 to load supplying below, so the
One road power supply is powered preferentially.
(2) first via power supply powers U1 when powering that preferential and the only second road power supply U2 individually powers, control signal VAUX_
CTL is low level, and the base stage of the 3rd audion Q3 will be low, and the 3rd audion Q3 will be turned off, and the first audion Q1 is just
Can not be by the 3rd audion Q3 conducting, the partial pressure of first resistor R1 and the 5th resistance R5 can make the base stage electricity of the second audion Q2
Pressure is higher with the voltage difference of the emitter stage of the first audion Q1, and the first audion Q1 just can be turned on by the second audion Q2,
Second road power supply U2 just can be by the first audion Q1 and the 3rd diode D3 to load supplying below.In conjunction with Fig. 4, specifically
's：First via power supply U1 is 0V, and the second road power supply U2 is 16V, and U2 powers preferentially, when only U2 individually powers, now power supply control
Signal processed should be low level, is substituted with switching signal here, and voltage is 0V.Reaching the 3rd audion Q3 base voltage is 0V, the
Three audion Q3 are cut off, and the first audion Q1 cannot be by the 3rd audion Q3 conducting, first resistor R1 and the 5th resistance
The voltage got of R5 is 2.9V, and this voltage can make the first audion Q1 turn on by the second audion Q2, such second
Road power supply U2 just can be to load supplying below.
(3) second road power supply U2 power preferentially and two-way power supply is powered simultaneously, and control signal VAUX_CTL is high level, the
The base stage of three audion Q3 will be height, and the 3rd audion Q3 will be switched on, due to the emitter voltage of the first audion Q1
Higher, the first audion Q1 just will can pass through the first audion Q1 by the 3rd audion Q3 conducting, the second road power supply U2, the
The collector voltage of one audion Q1 is higher than the output voltage of first via power supply U1, so the second road power supply can preferentially be powered.Knot
Close Fig. 5, simulation result in figure：First via power supply U1 is 13V, and the second road power supply U2 is 16V, and U2 powers preferentially, and U1 and U2 is simultaneously
During power supply, now power control signal should be high level, is substituted with switching signal here, and voltage is 3.3V.Reach the three or three pole
Pipe Q3 base voltage is 3.3V, and the 3rd audion Q3 is switched on, and the first audion Q1 just can be turned on by the 3rd audion Q3, the
One audion Q1 collector voltage is 15.1V, higher than U1 voltage, so the second road power supply U2 just preferential load confession given below
Electricity.
When (4) second road power supply U2 power preferentially and only first via power supply U1 individually powers, control signal VAUX_CTL
For high level, the second road power supply U2 is output as 0, and the first audion Q1 emitter voltage is also 0, and the first audion Q1 can turn off,
The collector voltage of the first audion Q1 is also 0, and first via power supply U1 is higher than the collector voltage of the first audion Q1, so the
One road power supply U1 will be by the first diode D1 to load supplying below.In conjunction with Fig. 6, simulation result in figure：First via electricity
Source U1 is 13V, and the second road power supply U2 is 0V, and U2 powers preferentially, when only U1 individually powers.Because U2 voltage is 0V, the one or three
Pole pipe Q1 cannot turn on, and the collector voltage of the first audion Q1 is 0V, and now U1 voltage is higher than the collection of the first audion Q1
Electrode voltage, so first via power supply U1 just gives load supplying below.
The power supply switch circuit arranging two kinds of power supply priority of the present invention effectively solves the seamless switching of power supply
Problem, can flexibly be arranged according to demand, and whichever power supply is preferentially powered, and does not affect the normal output of power supply.This
Circuit in invention is simple, low cost, and small power consumption is practical, easily realizes the setting of power supply switching and priority, to two-way
The differential pressure requirements of electric power output voltage are also low, can very easily put into a large amount of uses.Power supply switch circuit in invention is permissible
In the power-supply system that the most of two-way power supplys being applied to presently, there are are powered.
Instantiation described herein is only that spirit of the present invention is illustrated.The technical field of the invention
Technical staff described instantiation can be made various modification supplement or using similar mode substitute, but
Spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (4)
1. a kind of power supply switch circuit that power supply priority is set it is characterised in that：It includes control circuit and switching circuit,
MCU carries out state control by control circuit to the audion of switching circuit；Described switching circuit include the first audion Q1,
Two audion Q2, the 3rd audion Q3, first resistor R1, second resistance R2, the 5th resistance R5 and stabilivolt D4, the described 1st
Pole pipe Q1 and the second audion Q2 are PNP type triode, and described 3rd audion Q3 is NPN type triode, the first audion Q1
Emitter stage connect the second road power supply U2, the colelctor electrode of the first audion Q1 connects load end, and first via power supply U1 also connects negative
Carry end, the base stage of the first audion Q1 connects the emitter stage of the second audion Q2 and the colelctor electrode of the 3rd audion Q3 respectively, the
The colelctor electrode of two audion Q2 and the grounded emitter of the 3rd audion Q3, the base stage of the 3rd audion Q3 connects the control of MCU
Signal VAUX_CTL；First resistor R1, second resistance R2 and the 5th resistance R5 constitute series connection bleeder circuit：Second resistance R2 connects
Between first via power supply U1 and divider node, first resistor R1 is connected between the second road power supply U2 and divider node, and the 5th
Resistance R5 is connected between divider node and ground, and divider node is connected with the base stage of the second audion Q2 through stabilivolt D4.
2. power supply switch circuit according to claim 1 it is characterised in that：Described switching circuit also includes the first diode
D1, the second diode D2, the 3rd diode D3, the 5th diode D5,3rd resistor R3, the 4th resistance R4, the 6th resistance R6,
Seven resistance R7 and the 8th resistance R8, physical circuit connects is：
First via power supply U1 mono- aspect connects the anode of the first diode D1, on the other hand connects stabilivolt by second resistance R2
The anode of D4；The anode of stabilivolt D4 passes through the 5th resistance R5 ground connection；The negative electrode of the first diode D1 connects one end of load；
Second road power supply U2 connects the anode of the second diode D2, and the negative electrode of the second diode D2 is divided into three branch roads：
Tie point connects the anode of stabilivolt D4 by first resistor R1, and the second branch road passes through the 8th resistance R8 and connects the one or three
The base stage of pole pipe Q1, the 3rd branch road connects the emitter stage of the first audion Q1；
The colelctor electrode of the first audion Q1 connects the anode of the 3rd diode D3, and the negative electrode of the 3rd diode D3 meets the another of load
End；
The base stage of the first audion Q1 connects the emitter stage of the second audion Q2 also by 3rd resistor R3；Second audion Q2's
Base stage connects the anode of the 5th diode D5, and the negative electrode of the 5th diode D5 connects the negative electrode of stabilivolt D4；Second audion Q2
Grounded collector；
The base stage of the first audion Q1 connects the colelctor electrode of the 3rd audion Q3 also by the 4th resistance R4, the 3rd audion Q3's
Grounded emitter, the base stage of the 3rd audion Q3 passes through control signal VAUX_CTL that the 6th resistance R6 connects MCU, the control of MCU
Signal VAUX_CTL processed is grounded also by the 7th resistance R7.
3. a kind of power-supply switching method based on power supply switch circuit described in claim 1 is it is characterised in that the control signal of MCU
VAUX_CTL connects the base stage of the 3rd audion Q3, and the height of control signal VAUX_CTL determines the break-make of the 3rd audion Q3,
The series connection bleeder circuit that first resistor R1, second resistance R2 and the 5th resistance R5 are constituted determines that can the first audion Q1 by the
Two audion Q2 carry out open-minded.
4. power-supply switching method according to claim 3 is it is characterised in that it includes following switch mode：
(1) when two-way power supply is powered simultaneously, control signal VAUX_CTL is low level, and first via power supply U1 preferentially powers；
(2) only has the second road power supply U2 when individually powering, control signal VAUX_CTL is low level, the second road power supply U2 passes through the
One audion Q1 and the 3rd diode D3 gives load supplying below；
(3) when two-way power supply is powered simultaneously, control signal VAUX_CTL is high level, and the second road power supply is preferentially powered；
(4) only has the first via power supply U1 when individually powering, control signal VAUX_CTL is high level, first via power supply U1 passes through the
One diode D1 gives load supplying below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611008797.5A CN106451736B (en) | 2016-11-16 | 2016-11-16 | The power supply switch circuit and power-supply switching method of settable power supply priority |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611008797.5A CN106451736B (en) | 2016-11-16 | 2016-11-16 | The power supply switch circuit and power-supply switching method of settable power supply priority |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106451736A true CN106451736A (en) | 2017-02-22 |
| CN106451736B CN106451736B (en) | 2019-03-26 |
Family
ID=58220108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611008797.5A Active CN106451736B (en) | 2016-11-16 | 2016-11-16 | The power supply switch circuit and power-supply switching method of settable power supply priority |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113467335A (en) * | 2021-07-30 | 2021-10-01 | 苏州浪潮智能科技有限公司 | Power supply control circuit, power supply control device and server |
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| CN101771292A (en) * | 2008-12-30 | 2010-07-07 | 北京谊安医疗系统股份有限公司 | Commutation circuit based on priorities and multi-path power supply commutation system containing same |
| CN103001315A (en) * | 2012-12-26 | 2013-03-27 | 上海斐讯数据通信技术有限公司 | Power supply switching circuit |
| US20140159687A1 (en) * | 2012-12-07 | 2014-06-12 | Samsung Electronics Co., Ltd. | Adaptive Power Converters and Methods of Operating the Same |
| CN204465135U (en) * | 2015-03-27 | 2015-07-08 | 国家电网公司 | The power supply circuits of ammeter and inside thereof |
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2016
- 2016-11-16 CN CN201611008797.5A patent/CN106451736B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771292A (en) * | 2008-12-30 | 2010-07-07 | 北京谊安医疗系统股份有限公司 | Commutation circuit based on priorities and multi-path power supply commutation system containing same |
| US20140159687A1 (en) * | 2012-12-07 | 2014-06-12 | Samsung Electronics Co., Ltd. | Adaptive Power Converters and Methods of Operating the Same |
| CN103001315A (en) * | 2012-12-26 | 2013-03-27 | 上海斐讯数据通信技术有限公司 | Power supply switching circuit |
| CN204465135U (en) * | 2015-03-27 | 2015-07-08 | 国家电网公司 | The power supply circuits of ammeter and inside thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113467335A (en) * | 2021-07-30 | 2021-10-01 | 苏州浪潮智能科技有限公司 | Power supply control circuit, power supply control device and server |
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| CN106451736B (en) | 2019-03-26 |
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Effective date of registration: 20210414 Address after: No. 666, Linyang Road, Qidong City, Nantong City, Jiangsu Province, 226200 Patentee after: JIANGSU LINYANG ENERGY Co.,Ltd. Patentee after: Nanjing Linyang Electric Co.,Ltd. Address before: No. 666, Linyang Road, Qidong City, Nantong City, Jiangsu Province, 226200 Patentee before: JIANGSU LINYANG ENERGY Co.,Ltd. |
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