CN106451736B - The power supply switch circuit and power-supply switching method of settable power supply priority - Google Patents
The power supply switch circuit and power-supply switching method of settable power supply priority Download PDFInfo
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- CN106451736B CN106451736B CN201611008797.5A CN201611008797A CN106451736B CN 106451736 B CN106451736 B CN 106451736B CN 201611008797 A CN201611008797 A CN 201611008797A CN 106451736 B CN106451736 B CN 106451736B
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- 238000004088 simulation Methods 0.000 description 7
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Classifications
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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
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Abstract
The invention discloses the power supply switch circuit and power-supply switching method of a kind of settable power supply priority, power supply switch circuit includes control circuit and switching circuit, and MCU carries out state control by triode of the control circuit to switching circuit.When it can effectively solve two kinds of independent current sources of intelligent electric energy meter while powering, the unconvertible problem of the priority of power supply power supply.Compared to dedicated power supply chip, of the invention is versatile, does not need using dedicated power supply chip, can effectively realize the switching of power supply priority.The present invention has the advantages that low-cost and easy-to maintenance can very easily put into a large amount of uses, the power supply switch circuit that can set of priority of the low cost in invention can be applied to presently, there are most of power-supply systems in.
Description
Technical field
The present invention relates to a kind of power supply switch circuits of the electric energy meter of two road independent power supply of band, are particularly suitable for two
Kind power supply exports the occasion that has differential pressure requirements, priority can be set, and can switch in real time.
Background technique
As the power demand of industry, agriculture, business and resident living in social life is growing, people are to electric energy
Transaction it is increasingly frequent, electric energy meter is the measurement instrument for measuring power trade number, and technical to require very high, it is accurate more to require
And stabilization, and guarantee reliably and with long-term.Wherein with the intelligent electric energy meter of accessory power supply, there are main power source power supply and two kinds of accessory power supply confessions
Electric mode, two kinds of power supply modes are mutually indepedent.In order to meet the needs of various users, it is desirable that we are excellent to two kinds of power supplies
First grade is configured, and realizes automatic switchover.
Currently, most of intelligent electric energy meters with accessory power supply are all that accessory power supply is preferentially powered in the market.It is general to set
Meter is all that the output voltage of accessory power supply is higher than the output voltage of main power source, since the output voltage of 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 in real time according to demand.So single auxiliary electricity
The mode that source preferentially powers has been unable to meet the market demand.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of switching circuit of simple settable two kinds of power supply power supply priority,
When so that electric energy meter working, can according to requiring the priority to first via power supply and the second road power supply to be arranged in real time, and
It realizes the automatic seamless switching of power supply, while the working condition of ammeter is not had an impact.
The invention proposes a kind of power supply switch circuits of settable power supply priority, it includes control circuit and switching electricity
Road, MCU carry out state control by triode of the control circuit to switching circuit；The switching circuit includes the first triode
Q1, the second triode Q2, third transistor Q3, first resistor R1, second resistance R2, the 5th resistance R5 and voltage-stabiliser tube D4, it is described
First triode Q1 and the second triode Q2 be PNP type triode, the third transistor Q3 be NPN type triode, the one or three
The emitter of pole pipe Q1 connects the second road power supply U2, and the collector of the first triode Q1 connects load end, first via power supply U1
Load end is connected, the base stage of the first triode Q1 is separately connected the emitter of the second triode Q2 and the current collection of third transistor Q3
Pole, the collector of the second triode Q2 and the emitter ground connection of third transistor Q3, the base stage connection MCU's of third transistor Q3
Control signal VAUX_CTL；First resistor R1, second resistance R2 and the 5th resistance R5 constitute series connection bleeder circuit: second resistance R2
It being 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 through voltage-stabiliser tube D4 with the base stage of the second triode Q2.
The switching circuit further includes first diode D1, the second diode D2, third 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 connection is:
On the one hand first via power supply U1 connects the anode of first diode D1, on the other hand steady by second resistance R2 connection
The anode of pressure pipe D4；The anode of voltage-stabiliser tube D4 is grounded by the 5th resistance R5；The one of the cathode connection load of first diode D1
End；
The anode of second road power supply U2 the second diode of connection D2, the cathode of the second diode D2 are divided into three branches:
For the first branch by the anode of first resistor R1 connection voltage-stabiliser tube D4, second branch passes through the 8th resistance R8 connection the
The base stage of one triode Q1, third branch connect the emitter of the first triode Q1；
The anode of the collector connection third diode D3 of first triode Q1, the cathode of third diode D3 connect load
The other end；
The base stage of first triode Q1 also passes through the emitter of 3rd resistor R3 the second triode of connection Q2；Second triode
The base stage of Q2 connects the anode of the 5th diode D5, the cathode of the cathode connection voltage-stabiliser tube D4 of the 5th diode D5；Two or three pole
The grounded collector of pipe Q2；
The base stage of first triode Q1 also passes through the collector of the 4th resistance R4 connection third transistor Q3, third transistor
The emitter of Q3 is grounded, and the base stage of third transistor Q3 passes through control the signal VAUX_CTL, MCU of the 6th resistance R6 connection MCU
Control signal VAUX_CTL also pass through the 7th resistance R7 ground connection.
The invention also discloses a kind of power-supply switching method based on the power supply switch circuit, the control signals of MCU
The height of the base stage of VAUX_CTL connection third transistor Q3, control signal VAUX_CTL determines the on-off of third transistor 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 triode Q1 by the
Two triode Q2 carry out open-minded.
Specifically, it includes following switch mode:
(1) when first via power supply U1 power supply is preferentially and two-way power supply is powered simultaneously, control signal VAUX_CTL is low level,
The base voltage for reaching third transistor Q3 is also low level, and third transistor Q3 can be ended, and the first triode Q1 cannot
It is connected by third transistor Q3；Since the partial pressure of second resistance R2 and the 5th resistance R5 can make the base stage electricity of the second triode Q2
Pressure is lower with the voltage difference of the emitter of the first triode Q1, and such first triode Q1 can not pass through the second triode Q2
Conducting, so the second road power supply U2 cannot give subsequent load supplying, first via power supply U1 will pass through first diode D1
To subsequent load supplying, so first via power supply can preferentially power；
(2) when first via power supply power supply U1 power supply is preferentially and only the second road power supply U2 individually powers, signal VAUX_ is controlled
CTL is low level, the base stage of third transistor Q3 will be it is low, third transistor Q3 will be turned off, and the first triode Q1 is just
It cannot be connected by third transistor Q3, the partial pressure of first resistor R1 and the 5th resistance R5 can make the base stage electricity of the second triode Q2
Pressure is higher with the voltage difference of the emitter of the first triode Q1, and the first triode Q1 can be connected by the second triode Q2,
Second road power supply U2 can give subsequent load supplying by the first triode Q1 and third diode D3；
(3) second road power supply U2 power supply is preferential and two-way power supply is powered simultaneously, and control signal VAUX_CTL is high level, the
The base stage of three triode Q3 will be height, and third transistor Q3 will be switched on, due to the emitter voltage of the first triode Q1
Higher, the first triode Q1 will be connected by third transistor Q3, and the second road power supply U2 can pass through the first triode Q1, the
The collector voltage of one triode Q1 is higher than the output voltage of first via power supply U1, so the second road power supply can preferentially power；
When (4) second road power supply U2 power supply is preferential and only first via power supply U1 individually powers, signal VAUX_CTL is controlled
For high level, the second road power supply U2 output is 0, and the first triode Q1 emitter voltage is also 0, and the first triode Q1 can be turned off,
The collector voltage of first triode Q1 is also 0, and first via power supply U1 is higher than the collector voltage of the first triode Q1, so the
Power supply U1 will give subsequent load supplying by first diode D1 all the way.
Beneficial effects of the present invention
The power supply switch circuit effective solution of the settable two kinds of power supply priority of the invention seamless switching of power supply
Problem can carry out flexible setting according to demand, whichever power supply is preferentially powered, and the normal work of ammeter is not affected.This
Circuit in invention is simple, at low cost, and small power consumption is practical, the setting of power supply switching and priority easy to accomplish, 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 can be with
Applied to presently, there are most of two-way power supply power supplies power-supply system in.
Detailed description of the invention
Fig. 1 is the functional block diagram of the power supply switch circuit of settable power supply priority
Fig. 2 is the actual principle figure of power supply switch circuit
Fig. 3 is simulation result diagram when first via power supply power supply is preferential and two power supplys are powered simultaneously
Fig. 4 is simulation result diagram when first via power supply power supply is preferential and the second road power supply is individually powered
Fig. 5 is simulation result diagram when the second tunnel power supply power supply is preferential and two power supplys are powered simultaneously
Fig. 6 is simulation result diagram when the second tunnel power supply power supply is preferential and first via power supply is individually powered
Specific embodiment
Below with reference to embodiment, the invention will be further described, and but the scope of the present invention is not limited thereto:
It as shown in connection with fig. 1, is the functional block diagram of the power supply switch circuit of settable power supply priority, in duplex feeding power supply
Between add a control circuit and switching circuit, can then be provided by MCU control signal VAUX_CTL control switching circuit, switching
It is preferential that circuit can control corresponding power supply power supply according to this signal by a series of variation of level.The characteristics of switching circuit is
The priority of power supply is controlled using the triode and suitable resistance of several low costs.When needing to power supply
Priority when making a change, without changing circuit design, it is only necessary to as soon as MCU exports a level signal, control can be reached and supplied
The purpose of power supply priority, while state when not influencing certain again power supply individually being powered all the way.Such effective solution makes
With common power supply switch circuit, the unalterable problem of power supply priority.
In conjunction with Fig. 2, the physical circuit figure of power supply switch circuit is given, herein such as summary of the invention description, so it will not be repeated.
The invention also discloses a kind of power-supply switching method based on power supply switch circuit shown in Fig. 2, the control signals of MCU
The height of the base stage of VAUX_CTL connection third transistor Q3, control signal VAUX_CTL determines the on-off of third transistor 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 triode Q1 by the
Two triode Q2 carry out open-minded.
Specifically, it includes following switch mode:
(1) when first via power supply U1 power supply is preferentially and two-way power supply is powered simultaneously, control signal VAUX_CTL is low level,
The base voltage for reaching third transistor Q3 is also low level, and third transistor Q3 can be ended, and the first triode Q1 cannot
It is connected by third transistor Q3；Since the partial pressure of second resistance R2 and the 5th resistance R5 can make the base stage electricity of the second triode Q2
Pressure is lower with the voltage difference of the emitter of the first triode Q1, and such first triode Q1 can not pass through the second triode Q2
Conducting, so the second road power supply U2 cannot give subsequent load supplying, first via power supply U1 will pass through first diode D1
To subsequent load supplying, so first via power supply can preferentially power.In conjunction with Fig. 3, in simulation result diagram: first via power supply U1 is
13V, the second road power supply U2 are 16V, and U1 power supply is preferential, and when U1 and U2 power simultaneously, power control signal should be low level at this time,
Here it is substituted with switching signal, voltage 0V.Arrival third transistor Q3 base voltage is 0V, and third transistor Q3 is ended,
First triode Q1 cannot be connected by third transistor Q3, and the voltage of second resistance R2 and the 5th resistance R5 got is
11.8V causes the first triode Q1 and the second triode Q2 to be ended, such second road power supply due to this overtension
U2 cannot give subsequent load supplying, and first via power supply U1 gives subsequent load supplying by first diode D1, so the
Power supply power supply is preferential all the way.
(2) when first via power supply power supply U1 power supply is preferentially and only the second road power supply U2 individually powers, signal VAUX_ is controlled
CTL is low level, the base stage of third transistor Q3 will be it is low, third transistor Q3 will be turned off, and the first triode Q1 is just
It cannot be connected by third transistor Q3, the partial pressure of first resistor R1 and the 5th resistance R5 can make the base stage electricity of the second triode Q2
Pressure is higher with the voltage difference of the emitter of the first triode Q1, and the first triode Q1 can be connected by the second triode Q2,
Second road power supply U2 can give subsequent load supplying by the first triode Q1 and third diode D3.In conjunction with Fig. 4, specifically
: first via power supply U1 is 0V, and the second road power supply U2 is 16V, and U2 power supply is preferential, when only U2 individually powers, power supply control at this time
Signal processed should be low level, be substituted here with switching signal, voltage 0V.Arrival third transistor Q3 base voltage is 0V, the
Three triode Q3 are ended, and the first triode Q1 cannot be connected by third transistor Q3, first resistor R1 and the 5th resistance
The voltage of R5 got is 2.9V, this voltage can be such that the first triode Q1 is connected by the second triode Q2, such second
Road power supply U2 can give subsequent load supplying.
(3) second road power supply U2 power supply is preferential and two-way power supply is powered simultaneously, and control signal VAUX_CTL is high level, the
The base stage of three triode Q3 will be height, and third transistor Q3 will be switched on, due to the emitter voltage of the first triode Q1
Higher, the first triode Q1 will be connected by third transistor Q3, and the second road power supply U2 can pass through the first triode Q1, the
The collector voltage of one triode Q1 is higher than the output voltage of first via power supply U1, so the second road power supply can preferentially power.Knot
Fig. 5 is closed, in simulation result diagram: first via power supply U1 is 13V, and the second road power supply U2 is 16V, and U2 power supply is preferential, and U1 and U2 are simultaneously
When power supply, power control signal should be high level at this time, be substituted here with switching signal, voltage 3.3V.Reach the three or three pole
Pipe Q3 base voltage is 3.3V, and third transistor Q3 is switched on, and the first triode Q1 can be connected by third transistor Q3, the
One triode Q1 collector voltage is 15.1V, higher than U1 voltage, so the second road power supply U2 is just preferentially supplied to subsequent load
Electricity.
When (4) second road power supply U2 power supply is preferential and only first via power supply U1 individually powers, signal VAUX_CTL is controlled
For high level, the second road power supply U2 output is 0, and the first triode Q1 emitter voltage is also 0, and the first triode Q1 can be turned off,
The collector voltage of first triode Q1 is also 0, and first via power supply U1 is higher than the collector voltage of the first triode Q1, so the
Power supply U1 will give subsequent load supplying by first diode D1 all the way.In conjunction with Fig. 6, in simulation result diagram: first via electricity
Source U1 is 13V, and the second road power supply U2 is 0V, and U2 power supply is preferential, when only U1 individually powers.Due to U2 voltage be 0V, the one or three
Pole pipe Q1 cannot be connected, and the collector voltage of the first triode Q1 is 0V, and U1 voltage is higher than the collection of the first triode Q1 at this time
Electrode voltage, so first via power supply U1 just gives subsequent load supplying.
The power supply switch circuit effective solution of the settable two kinds of power supply priority of the invention seamless switching of power supply
Problem can carry out flexible setting according to demand, whichever power supply is preferentially powered, and the normal output of power supply is not affected.This
Circuit in invention is simple, at low cost, and small power consumption is practical, the setting of power supply switching and priority easy to accomplish, 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 can be with
Applied to presently, there are most of two-way power supply power supplies power-supply system in.
Specific example described herein is only to illustrate to spirit of that invention.The technical field of the invention
Technical staff various modifications or additions can be done to described specific example or be substituted in a similar manner, but
Without departing from the spirit of the invention or going beyond the scope defined by the appended claims.
Claims (3)
1. a kind of power supply switch circuit of settable power supply priority, it is characterised in that: it includes control circuit and switching circuit,
MCU carries out state control by triode of the control circuit to switching circuit；The switching circuit includes the first triode Q1, the
Two triode Q2, third transistor Q3, first resistor R1, second resistance R2, the 5th resistance R5 and voltage-stabiliser tube D4, the described 1st
Pole pipe Q1 and the second triode Q2 is PNP type triode, and the third transistor Q3 is NPN type triode, the first triode Q1
Emitter connect the second road power supply U2, the collector of the first triode Q1 connects load end, and first via power supply U1, which also connect, to be born
End is carried, the base stage of the first triode Q1 is separately connected the emitter of the second triode Q2 and the collector of third transistor Q3, the
The collector of two triode Q2 and the emitter ground connection of third transistor Q3, the control of the base stage connection MCU of third transistor Q3
Signal VAUX_CTL；First resistor R1, second resistance R2 and the 5th resistance R5 constitute series connection bleeder circuit: second resistance R2 connection
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 through voltage-stabiliser tube D4 with the base stage of the second triode Q2；It is described
Switching circuit further include first diode D1, the second diode D2, third diode D3, the 5th diode D5,3rd resistor R3,
4th resistance R4, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8, physical circuit connection is:
On the one hand first via power supply U1 connects the anode of first diode D1, on the other hand pass through second resistance R2 connection voltage-stabiliser tube
The anode of D4；The anode of voltage-stabiliser tube D4 is grounded by the 5th resistance R5；One end of the cathode connection load of first diode D1；
The anode of second road power supply U2 the second diode of connection D2, the cathode of the second diode D2 are divided into three branches:
The first branch passes through the anode of first resistor R1 connection voltage-stabiliser tube D4, and second branch passes through the 8th resistance R8 connection the one or three
The base stage of pole pipe Q1, third branch connect the emitter of the first triode Q1；
The anode of the collector connection third diode D3 of first triode Q1, the cathode of third diode D3 meet the another of load
End；
The base stage of first triode Q1 also passes through the emitter of 3rd resistor R3 the second triode of connection Q2；Second triode Q2's
Base stage connects the anode of the 5th diode D5, the cathode of the cathode connection voltage-stabiliser tube D4 of the 5th diode D5；Second triode Q2
Grounded collector；
The base stage of first triode Q1 also passes through the collector of the 4th resistance R4 connection third transistor Q3, third transistor Q3's
Emitter ground connection, the base stage of third transistor Q3 pass through the control of control the signal VAUX_CTL, MCU of the 6th resistance R6 connection MCU
Signal VAUX_CTL processed also passes through the 7th resistance R7 ground connection.
2. a kind of power-supply switching method based on power supply switch circuit described in claim 1, it is characterised in that the control signal of MCU
The height of the base stage of VAUX_CTL connection third transistor Q3, control signal VAUX_CTL determines the on-off of third transistor 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 triode Q1 by the
Two triode Q2 carry out open-minded.
3. power-supply switching method according to claim 2, 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) when only having the second road power supply U2 individually to power, control signal VAUX_CTL is low level, and the second road power supply U2 passes through the
One triode Q1 and third diode D3 gives subsequent load supplying；
(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) when only having first via power supply U1 individually to power, control signal VAUX_CTL is high level, and first via power supply U1 passes through the
One diode D1 gives subsequent load supplying.
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 |
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| Publication Number | Publication Date |
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| CN106451736A CN106451736A (en) | 2017-02-22 |
| CN106451736B true CN106451736B (en) | 2019-03-26 |
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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 |
Citations (3)
| 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 |
| 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 | Meter and its internal power supply circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101989575B1 (en) * | 2012-12-07 | 2019-06-14 | 삼성전자주식회사 | Adaptive power converting device |
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- 2016-11-16 CN CN201611008797.5A patent/CN106451736B/en active Active
Patent Citations (3)
| 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 |
| 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 | Meter and its internal power supply circuit |
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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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