CN102447302A - Main-standby power supply switching control method and device - Google Patents
Main-standby power supply switching control method and device Download PDFInfo
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- CN102447302A CN102447302A CN2010105214189A CN201010521418A CN102447302A CN 102447302 A CN102447302 A CN 102447302A CN 2010105214189 A CN2010105214189 A CN 2010105214189A CN 201010521418 A CN201010521418 A CN 201010521418A CN 102447302 A CN102447302 A CN 102447302A
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Abstract
The invention discloses a main-standby power supply switching control method and device. The device is connected to an external main power supply and an external standby power supply and comprises a power supply control circuit unit, a switching control circuit unit, a main power supply switching circuit unit and a standby power supply switching circuit unit, wherein, the power supply control circuit unit is used for controlling the switching control circuit unit to realize normal power supply under a normal state or power failure state of the main power supply; the switching control circuit unit is used for controlling the main power supply switching circuit unit to be switched off when the voltage of the main power supply is lower than a threshold value, and performing seamless switching to switch on the standby power supply switching circuit unit so as to realize normal power supply by virtue of the standby power supply; the main power supply switching circuit unit is used for switching on the main power supply for normal power supply or switching off the main power supply under the control of the switching control circuit unit; and the standby power supply switching circuit unit is used for switching on the standby power supply for normal power supply or switching off the standby power supply under the control of the switching control circuit unit. By adopting the technical scheme, seamless switching between the main power supply and the standby power supply is realized.
Description
Technical field
The present invention relates to a kind of automatic control technology field, particularly relate to a kind of main power supply method for handover control and device.
Background technology
When carrying out electronic equipment or design of electronic circuits, by main power source load is supplied power usually, if break down can not the bio-occlusion electric for main power source,, usually need backup battery be set to main power source for raising equipment or reliability of system operation.
One Chinese patent application number is the switching control that 200610060875.6 application for a patent for invention discloses a kind of main power supply, and said device comprises: the main road switch control unit of opening and turn-offing according to main power source and the pressure reduction control main power source supply access that closes the road output voltage; And the subsequent use switch control unit of opening and turn-offing according to the pressure reduction of main road supply voltage and reference voltage control stand-by power supply power supply circuits path.Main road switch control unit and subsequent use switch control unit comprise the low pressure drop switching component that a control power path is opened and turn-offed respectively.
One Chinese patent application number is the device that 200710165110.3 application for a patent for invention discloses other a kind of main power supply switching controls, and this device comprises main road highway switch module, overvoltage/undervoltage detection module, be equipped with that the road is slow opens module and be equipped with the road control module.
The utility model patent of Chinese patent numbers 200820055923.7 discloses a kind of main power supply from cutting apparatus; This device comprises autotomy circuit and warning device, and the said circuit of autotomying is made up of resistance-capacitance depressurization circuit, rectification circuit, optocoupler testing circuit, wireless transmitter module, wireless receiving module and relay drive circuit.
But, in the prior art,, under the situation of the unexpected power down of main power source, will influence the preceding reading and writing data of unexpected power down for the power supply of memory device, can't accomplish the normal read-write operation of final data.Simultaneously, carry out in the prior art after main power supply switches, stand-by power supply will be supplied power to load always, shorten the service time and the useful life of stand-by power supply.
Summary of the invention
The object of the present invention is to provide a kind of main power supply method for handover control and device, it realizes the seamless switching between the main power supply.
Be a kind of main power supply switching control of realizing that the object of the invention provides; It is connected to outside main power source and stand-by power supply, comprises the power control circuit unit, the control switching circuit unit; Main power switch circuit unit and Backup Power Switch circuit unit, wherein:
Said power control circuit unit is used for controlling said control switching circuit unit and carrying out normal power supply under the situation of or power down normal at said main power source;
Said control switching circuit unit is used for after main power voltage is lower than threshold value, controls said main power switch circuit unit and breaks off, and carries out seamless switching, and the said Backup Power Switch circuit unit of conducting utilizes said stand-by power supply normal power supply;
Said main power switch circuit unit is used under said control switching circuit unit controls, and the said main power source normal power supply of conducting perhaps breaks off said main power source;
Said Backup Power Switch circuit unit is used under said control switching circuit unit controls, and the said stand-by power supply normal power supply of conducting perhaps breaks off said stand-by power supply.
More excellent ground; Described main power supply switching control also comprises time delay circuit unit, is used to be controlled at said main power source power down; After switching to said stand-by power supply; When time-delay reaches time T, stop to be the power supply of said control switching circuit unit, control Backup Power Switch circuit unit breaks off stand-by power supply.
More excellent ground, described main power supply switching control also comprises main power source anti-back flow circuit unit and stand-by power supply anti-back flow circuit unit;
Said main power source anti-back flow circuit unit is used in said main power source power down, and under the situation of said stand-by power supply normal power supply, control makes that not having the anti-electric current of irritating pours into said main power source;
Said stand-by power supply anti-back flow circuit unit is used for cutting off in said stand-by power supply output, and under the situation of said main power source normal power supply, control makes that not having the anti-electric current of irritating pours into said stand-by power supply.
More excellent ground, said power control circuit unit comprises diode VD1, binary channels single-pole double throw type relay K 1, binary channels open type relay K 2;
Diode VD1 directly is connected with main power source;
Said main power source is connected with said relay K 1; Said relay K 1 also is connected with said relay K 2; Said relay K 1 also is connected with said control switching circuit unit;
Said relay K 2 is connected with said stand-by power supply; Said relay K 2 also links to each other with said stand-by power supply anti-back flow circuit unit; Said relay K 2 is connected with said power control circuit unit.
More excellent ground, said control switching circuit unit comprises voltage monitoring chip D1, resistance R 1, resistance R 2;
Said resistance R 1 is connected with said resistance R 2, to the dividing potential drop of said main power source; Voltage accesses to said voltage monitoring chip D1 after the dividing potential drop, and said voltage monitoring chip D1 monitors said main power source.
More excellent ground, said voltage monitoring chip D1 comprises reset switch and inverted reset switch;
Said reset switch is controlled said main power switch circuit unit; Said inverted reset switch is controlled said Backup Power Switch circuit unit; The signal of said inverted reset switch and said reset switch is embodied as a pair of interlocking signal in said voltage monitoring chip D1 inside.
For realizing that the object of the invention also provides a kind of main power supply method for handover control, comprise the steps:
Step S100 carries out under-voltage detection to main power voltage, when voltage just often, control main power source powering load is controlled stand-by power supply simultaneously and is forbidden powering load;
Step S200, when detecting main power source when under-voltage, the main power source powering load is forbidden in control, and seamlessly switches to stand-by power supply, by the stand-by power supply powering load.
More excellent ground, described main power supply method for handover control also comprises the steps:
Step S300, after main power source power down, cut-in stand-by power supply were supplied power, when time-delay reached time T, the control stand-by power supply broke off, and forbids supplying power to load.
More excellent ground, said step S100 comprises the steps:
Step S110 cuts off in stand-by power supply output, and under the situation of main power source powering load, control makes that not having the anti-electric current of irritating pours into stand-by power supply.
More excellent ground, said step S200 comprises the steps:
Step S210, in the main power source power down, under the situation of stand-by power supply powering load, control makes that not having the anti-electric current of irritating pours into main power source.
The invention has the beneficial effects as follows: main power supply method for handover control of the present invention and device after the main power source power down, can seamlessly switch to the stand-by power supply power supply.Further, behind stand-by power supply power supply a period of time T, the power supply of turning off stand-by power supply automatically; Accomplish the normal read-write operation of final data with this; Further, it also in the main power supply power supply process, prevents that effectively electric current from pouring in down a chimney; It can make the switching of main power supply more perfect, guarantees the useful life of stand-by power supply.
Description of drawings
Fig. 1 is an embodiment of the invention main power supply switching control structural representation;
Fig. 2 is an embodiment of the invention main power supply switching control circuit diagram.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, main power supply method for handover control of the present invention and device are further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Like Fig. 1, shown in 2, wherein, Fig. 1 is an embodiment of the invention main power supply switching control structural representation; Fig. 2 is an embodiment of the invention main power supply switching control circuit diagram.
But as a kind of execution mode; A kind of main power supply switching control of the embodiment of the invention, it is connected to outside main power source and stand-by power supply, comprises power control circuit unit 1; Control switching circuit unit 2, main power switch circuit unit 3 and Backup Power Switch circuit unit 4.
Preferably, said main power supply switching control also comprises time delay circuit unit 5.
More preferably, said main power supply switching control also comprises main power source anti-back flow circuit unit 6 and stand-by power supply anti-back flow circuit unit 7.
Specify each circuit unit of the main power supply switching control of the embodiment of the invention below.
Said power control circuit unit 1 is used under the situation of or power down normal at main power source, and control control switching circuit unit 2 carries out normal power supply.
As shown in Figure 2, but as a kind of execution mode, said power control circuit unit comprises diode VD1, binary channels single-pole double throw type relay K 1, binary channels open type relay K 2.
The effect of diode VD1 in circuit is after relay controlled stage outage, and the coil of relay inside is carried out afterflow, and its annexation is: 1 pin directly is connected with main power source, and 2 pin directly are connected with ground.
Relay K 1 is a single-pole double throw type relay, realizes the selection of main power source and stand-by power supply.
But as a kind of execution mode, main power source is connected with 4 pin, 5 pin of relay K 1, and 7 pin of relay K 1,8 pin are connected with 4 pin of relay K 2; 3 pin of relay K 1,6 pin are connected with 2 pin of the voltage monitoring chip D1 of control switching circuit unit 2; Simultaneously; Control end 8 pin of relay K 1 connect main power source; 5 pin, 2 pin of the direct earth fault relay K2 of 1 pin are connected with stand-by power supply, and 3 pin of 4 pin of relay K 2 and 7 pin of relay K 1, relay K 2 and the item of stand-by power supply anti-back flow circuit unit 7 are that 5～8 pin of the PMOS pipe of VT7 link to each other, and realization power control circuit unit 1 is connected with stand-by power supply anti-back flow circuit unit 7; Control end 1 pin of relay K 2 and the item of time delay circuit unit 5 are that 5～8 pin of the PMOS pipe of VT6 link to each other the direct ground connection of 6 pin of relay K 2.
Through the connection between each parts; Realize the connection between main power source, power control circuit unit 1, control switching circuit unit 2, stand-by power supply, the stand-by power supply anti-back flow circuit unit 7, supply power through main power supply by 1 control control switching circuit unit 2, power control circuit unit.
Said control switching circuit unit 2 is used for being lower than threshold value V when main power voltage
THAfter, control main power switch circuit unit 3 breaks off, and carries out seamless switching, and conducting Backup Power Switch circuit unit 4 utilizes stand-by power supply to continue normal power supply for load.
As shown in Figure 2, but as a kind of execution mode, control switching circuit unit 2 comprises voltage monitoring chip D1, resistance R 1, resistance R 2;
In the embodiment of the invention, but, in voltage monitoring chip D1, reset switch (RESET) control main power switch circuit unit 3 is set, inverted reset switch (RESET*) control Backup Power Switch circuit unit 4 as a kind of execution mode; RESET* and RESET signal are embodied as a pair of interlocking signal in voltage monitoring chip D1 inside.Like this, since the interlocked relationship of reset switch (RESET) and inverted reset switch (RESET*), the seamless switching of realization main power source and stand-by power supply.
Preferably, but as a kind of execution mode, said voltage monitoring chip D1 is the MAX708SCSA chip, and it adopts integrated device, and reliability is high, and saves the plate area;
Preferably, said threshold value V
THBe 90% of normal voltage value.More preferably, resistance R is passed through in said threshold value setting
2And R
1Adjustment is set.Be threshold value
Wherein, V
REFThe reference voltage of expression threshold setting.
More preferably, said V
REF=1.25V.
But as a kind of execution mode; At voltage monitoring chip D1 is in the MAX708SCSA chip, and threshold value
is set
Voltage is connected to 4 pin of voltage monitoring chip D1 after the dividing potential drop; Voltage monitoring chip D1 monitors main power source; When the voltage of the non-inverting input (PFI) of voltage monitoring chip D1 is higher than voltage 1.25V; Its 8 pin output low level, reset switch (RESET) is a low level, closed main power switch circuit unit 3; 7 pin output high level, inverted reset switch (RESET*) is a high level, breaks off Backup Power Switch circuit unit 4.
Main power switch circuit unit 3 is used under 2 controls of control switching circuit unit, and conducting main power source normal power supply perhaps breaks off main power source.
Backup Power Switch circuit unit 4 is used under 2 controls of control switching circuit unit, and stand-by power supply is perhaps broken off in the power supply of conducting stand-by power supply.
But as a kind of execution mode, main power switch circuit unit 3 is realized by PMOS (Positive channel Metal Oxide Semiconductor) pipe with Backup Power Switch circuit unit 4.
Said main power switch circuit unit 3 comprises that item is the PMOS pipe of VT3.Item is that 1 pin of the PMOS pipe of VT3 directly is connected with main power source with 3 pin; 2 pin are connected with 8 pin of 4 pin with voltage monitoring chip D1; 5～8 pin and the item of main power source anti-back flow circuit unit 6 are that 5～8 pin of the PMOS pipe of VT2 are connected; Be connected with resistance R 19 simultaneously, to realize the metering function of resistance R 19.
Said Backup Power Switch circuit unit 7; Comprise that item is the PMOS pipe of VT4; Item is that PMOS pipe 5～8 pin and the item of VT4 is that 1 pin that the PMOS of VT6 manages is connected with 3 pin; 2 pin and 4 pin are through being connected with 7 pin of voltage monitoring chip D1, and 1 pin and 3 pin and item are that 1 pin that the PMOS of VT7 manages is connected with 3 pin.
Said main power supply switching control also comprises time delay circuit unit 5, is used to control stand-by power supply after main power source power down time T, stop to be 2 power supplies of control switching circuit unit, and control Backup Power Switch circuit unit 4 breaks off stand-by power supply.
Said time delay circuit unit 5 is after control switching circuit unit 2 control main power sources switch to stand-by power supply, and T between delay arrival time stops to be 2 power supplies of control switching circuit unit, controls time delay circuit unit 5 then and breaks off stand-by power supply.
Time delay circuit unit 5 comprises resistance R 19, R14, R15, R20, R17, capacitor C 2, triode VT5, and item is the PMOS pipe of VT6;
Resistance R 14, R15 series connection, the collector electrode of dividing potential drop, control triode VT5 and the conducting of emitter or end.
The base stage of triode VT5 is connected between resistance R 14 and the R15, the direct ground connection of emitter, and collector electrode is pulled to voltage monitoring chip D1 (MAX708SCSA) via resistance R 17;
Said resistance R 19 is connected with capacitor C 2, when main power source charges to capacitor C 2, and the size of resistance R 19 limit charging current.
Resistance R 20 1 ends are connected with 2 pin of voltage monitoring chip D1, and the other end is connected the function of drawing in the realization with 3 pin of triode VT5.
Said main power source anti-back flow circuit unit 6 is used in the main power source power down, and stand-by power supply is given under the situation of load normal power supply, and control makes that not having the anti-electric current of irritating pours into main power source.
Said stand-by power supply anti-back flow circuit unit 7 is used for cutting off in stand-by power supply output, and main power source is given under the situation of load normal power supply, and control makes that not having the anti-electric current of irritating pours into stand-by power supply.
But as a kind of execution mode, said main power source anti-back flow circuit unit 6 is realized by the PMOS pipe with stand-by power supply anti-back flow circuit unit 7.
As shown in Figure 2, but as a kind of execution mode, said main power source anti-back flow circuit unit 6 comprises that item is the PMOS pipe of VT2, and said item is that the G utmost point of the PMOS pipe of VT2 is connected with the reset switch (RESET) of voltage monitoring chip D1; Said item is that the D utmost point and the item of main power switch circuit unit 3 of the PMOS pipe of VT2 is that the D utmost point of the PMOS pipe of VT3 is connected, and said item is that the S utmost point and the item of time delay circuit unit 5 of the PMOS pipe of VT2 is that the S utmost point that the PMOS of VT6 manages is connected;
Said stand-by power supply anti-back flow circuit unit 7 comprises that item is the PMOS pipe of VT7; Said item is 3 pin that the D utmost point of the PMOS pipe of VT7 is succeeded electrical equipment K2; Said item is that the S utmost point of the PMOS pipe of VT7 connects the S utmost point that item is the PMOS pipe of VT4, and said item is that the G utmost point of the PMOS pipe of VT7 is connected with the inverted reset switch (RESET*) of voltage monitoring chip D1 through resistance R 21.
The device of embodiment of the invention main power supply switching controls guarantees can be the load normal power supply, and when the main power source power down, seamlessly switch to stand-by power supply under the situation of the normal perhaps power down of main power source.Further, behind the assurance main power source power down T, stand-by power supply also stops powering load, guarantees the long-term use of stand-by power supply with this.In the main power source power down, seamlessly switch to stand-by power supply after, in time T, be continuously electric; After stand-by power supply is the electric time T, turn-off stand-by power supply output, save the electric energy of stand-by power supply with this.
Further, the device of the main power supply switching controls of the embodiment of the invention guarantees the main power source power down, under the situation of stand-by power supply powering load, does not have the anti-electric current of irritating and pours into main power source.Stand-by power supply output is simultaneously cut off, and under the situation of main power source powering load, does not have the anti-electric current of irritating and pours into stand-by power supply.
Correspondingly, the embodiment of the invention also provides a kind of main power supply method for handover control, comprises the steps:
Step S100 carries out under-voltage detection to main power voltage, when voltage just often, control main power source powering load is controlled stand-by power supply simultaneously and is forbidden powering load;
Through the control of power control circuit unit 1, the 2 pairs of main power voltages in control switching circuit unit carry out under-voltage detection, when it detects main power voltage just often, control 3 conductings of main power circuit switch, the main power source powering load; Control stand-by power supply contactor 4 simultaneously and break off, forbid the stand-by power supply powering load;
When the main power source normal power supply; 5 pin of the relay K 1 of power control circuit unit 1 link to each other with 6 pin, 3 pin and 4 pin; 7 pin and 6 pin, 3 pin and 2 pin break off, and this moment, power control circuit unit 1 relay K 2 was in closure state, and conducting is also controlled the reset switch (RESET) of the voltage monitoring chip D1 (MAX708SCSA) of control switching circuit unit 2; Conducting main power switch circuit unit 3 utilizes main power source to be electric.
But as a kind of execution mode, when the reset switch (RESET) of voltage monitoring chip D1 was low level, the item of main power switch circuit unit 3 was the voltage V of the PMOS pipe of VT3
GSBe-3.3V, item is that the PMOS pipe of VT3 is in conducting state, and D, the conducting of S the two poles of the earth have realized the function of opening of main power source;
Wherein, V
GS (th)The expression item is the turn-on threshold voltage of the PMOS pipe of VT3, that is: V
GSGreater than V
GS (th), item is D, the conducting of S the two poles of the earth of the PMOS pipe of VT3; V
GSLess than V
GS (th)Item is D, S the two poles of the earth pinch off of the PMOS pipe of VT3.
Preferably, said item is the turn-on threshold voltage V of the PMOS pipe of VT3
GS (th)Be to the maximum-1.4V.
Main power voltage is normal, 5,6 conductings of the relay K 1 of power control circuit unit 1,3,4 conductings, the voltage monitoring chip D1 power supply that main power source is given control switching circuit unit 2 through relay K 1, voltage monitoring chip D1 work;
When the voltage monitoring chip D1 of control switching circuit unit 2 detects main power voltage just often; The reset switch (RESET) of voltage monitoring chip D1 is output as low level; Inverted reset switch (RESET*) is output as high level, and the item of main power source anti-back flow circuit unit 6 is that the PMOS pipe of VT2 and the item of main power switch circuit unit 3 are the V of the PMOS pipe of VT3
GSBe in conducting state (3.3V).
Main power source through item be the PMOS pipe, resistance R 19 of VT2, VT3 to capacitor C 2 chargings, after capacitor C 2 is full of electricity, voltage consistent with main power voltage (3.3V);
Through the voltage of resistance R 14, R15 dividing potential drop voltage V greater than triode VT5
Be (th), triode VT5 is in saturation condition, and collector electrode is dragged down, and the item of time delay circuit unit 5 is the voltage V of the PMOS pipe of VT6
GSFor-3.3V, the item of time delay circuit unit 5 is that the PMOS pipe of VT6 is in conducting state, main power source is normally exported (3.3V).
When the main power source passage is opened; Main power source is that the PMOS pipe of VT3 charges to the capacitor C 2 of time delay circuit unit 5 through the resistance R 19 of time delay circuit unit 5 through item; After being full of electricity; Item is the triode conducting of VT5, and the item of time delay circuit unit 5 is that the PMOS pipe of VT6 is in conducting state (3.3V), main power source powers to the load through VT3, VT2, VT6.
The control voltage of relay K 2 is conducting (3.3V), 2 pin and 3 pin, and 4 pin and 5 pin are in connected state, and 2 pin of relay K 1 and 3 pin, 6 pin and 7 pin are in off-state (0V), have cut off stand-by power supply and have given voltage monitoring chip D1 the passage of power supply.
When inverted reset switch (RESET*) when being output as high level, the item of stand-by power supply anti-back flow circuit unit 7 is the PMOS pipe of VT7, and item is the voltage V of the PMOS pipe of VT4
GSBe 0V, item is that the PMOS pipe of VT7, VT4 all is in cut-off state, has cut off the output of stand-by power supply.
In the embodiment of the invention, under normal circumstances, by the main power source power supply, stand-by power supply is in static state fully fully in load.
In the embodiment of the invention, be electric with the conducting of PMOS pipe, because the internal resistance the during conducting of PMOS pipe is very little, so its voltage loss is little, can reduce power consumption.
Preferably, said step S100 also comprises the following steps:
Step S110 cuts off in stand-by power supply output, and under the situation of main power source powering load, control makes that not having the anti-electric current of irritating pours into stand-by power supply.
Main power source just often, reset switch (RESET) is a low level, inverted reset switch (RESET*) is a high level, the item of main power source anti-back flow circuit unit 6 is PMOS pipe conducting (the voltage V of VT2
GS=-3.3V); The item of stand-by power supply anti-back flow circuit unit 7 is that the VGS of the PMOS pipe of VT7 is 0V.Item is that the PMOS pipe of VT2 is in conducting state, and item is that the PMOS pipe of VT7 is in cut-off state, because the direction of the parasitic diode (not shown) of PMOS pipe inside is pointed to the S utmost point by the D utmost point, prevents that the electric current of main power source from pouring in down a chimney into stand-by power supply.
Step S200, when detecting main power source when under-voltage, the main power source powering load is forbidden in control, and seamlessly switches to stand-by power supply, by the stand-by power supply powering load.
Through the control of power control circuit unit 1, the 2 pairs of main power voltages in control switching circuit unit carry out under-voltage detection, and when it detects main power source when under-voltage, control main power circuit switch 3 breaks off, and forbids the main power source powering load; Simultaneously, 4 conductings of seamless control stand-by power supply contactor switch to stand-by power supply, by the stand-by power supply powering load.
Behind the main power source powered-off fault; 7 pin of the relay K 1 of power control circuit unit 1 link to each other with 6 pin, 3 pin and 2 pin, and 5 pin and 6 pin, 3 pin and 4 pin break off, and (K2 breaks off for the relay K 2 of power control circuit unit 1, K1 at this moment; But K1 is closed) the inverted reset switch (RESET*) of the voltage monitoring chip D1 (MAX708SCSA) of control control switching circuit unit 2; Realize seamless switching, conducting Backup Power Switch circuit unit 4 is powered to the load by stand-by power supply.
When the reset switch (RESET) of voltage monitoring chip D1 was high level, the item of main power switch circuit unit 3 was the voltage V of the PMOS pipe of VT3
GSBe 0V, item is that the PMOS pipe of VT3 is in cut-off state, and D, S the two poles of the earth pinch off have been realized the function that main power source cuts out.
But as a kind of execution mode, when the inverted reset switch (RESET*) of voltage monitoring chip D1 was low level, the item of Backup Power Switch circuit unit 4 was the V of the PMOS pipe of VT4
GSBe-3.3V, item be VT4 the PMOS pipe be in conducting state, D, the conducting of S the two poles of the earth have realized the function that stand-by power supply is opened.
When main power source is under-voltage, 7,6 pin conductings of the relay K 1 of power control circuit unit 1,3,2 pin conductings, the voltage monitoring chip D1 power supply that stand-by power supply is given control switching circuit unit 2 through relay K 2, K1, voltage monitoring chip D1 work;
But as a kind of execution mode; When the voltage of main power source is lower than
; The reversed-phase output of voltage monitoring chip D1 (PFO* end) output is continuously low level; Reset switch this moment (RESET) is a high level; Inverted reset switch (RESET*) is a low level, conducting Backup Power Switch circuit unit 4.
When reset switch (RESET) was high level, the item of main power switch circuit unit 3 was the voltage V of the PMOS pipe of VT3
GSBe 0V, the item of main power switch circuit unit 3 is that the PMOS pipe of VT3 is in cut-off state, and control main power switch circuit unit 3 turn-offs the output channel of main power source; Simultaneously, inverted reset switch (RESET*) is a low level, and item is that (3.3V), item is that the PMOS pipe of VT4 is in conducting state for the PMOS pipe conducting of VT4.
Detect main power voltage when under-voltage at voltage monitoring chip D1; The reset switch (RESET) of voltage monitoring chip D1 is output as high level; Inverted reset switch (RESET*) is output as low level, and the item of main power source anti-back flow circuit unit 6 is that the item of VT2 and main power switch circuit unit 3 is that the VGS of the PMOS pipe of VT3 is 0V, and item is that the PMOS pipe of VT2, VT3 is in cut-off state; Break off main power source anti-back flow circuit unit 6 and main power circuit switch, forbid the main power source power supply.Simultaneously; Inverted reset switch (RESET*) is output as low level; The item of stand-by power supply anti-back flow circuit unit 7 is the PMOS pipe of VT7; Item is that (3.3V), item is that the PMOS pipe of VT7, VT4 all is in conducting state, and stand-by power supply exports load to through relay K 2, VT7, VT4, VT6 for the PMOS pipe conducting of VT4.
More preferably, said step S200 also comprises the following steps:
Step S210, in the main power source power down, under the situation of stand-by power supply powering load, control makes that not having the anti-electric current of irritating pours into main power source.
During the main power source power down, reset switch (RESET) is a high level, and inverted reset switch (RESET*) is a low level, and 6 items of main power source anti-back flow circuit unit are the V of the PMOS pipe of VT2
GSBe 0V; The item of stand-by power supply anti-back flow circuit unit 7 is the V of the PMOS pipe of VT7
GSFor-3.3V.The item of main power source anti-back flow circuit unit 6 is that the PMOS pipe of VT2 is in cut-off state; Stand-by power supply anti-back flow circuit unit 7 items are that the PMOS pipe of VT7 is in conducting state; Because the direction of its inner parasitic diode (not shown) is pointed to the S utmost point by the D utmost point, can prevent that the electric current of stand-by power supply from pouring in down a chimney into main power source.
Step S300, after main power source power down, cut-in stand-by power supply were supplied power, when time-delay reached time T, the control stand-by power supply broke off, and forbids supplying power to load.
In the embodiment of the invention, guarantee when the main power source power down, seamlessly switch to the stand-by power supply T time of advent after, cut off stand-by power supply and give voltage monitoring chip D1 the path of power supply, guarantee stand-by power supply useful life with this.
Through the control of time delay circuit unit 5, after stand-by power supply contactor 4 ON times reached time T, time delay circuit unit 5 control stand-by power supply contactors 4 broke off, and forbid the stand-by power supply powering load.
After capacitor C 2 was full of electricity, when the main power source power down, capacitor C 2 was discharged through electric capacity R14, R15 over the ground, and along with the electric weight that stores in the capacitor C 2 reduces gradually, voltage is step-down gradually, as voltage V
BeDuring less than the conducting voltage of triode VT5, triode VT5 is in cut-off state.The collector electrode of triode VT5 makes that by drawing on the resistance R 17 item is the PMOS tube voltage V of VT1, VT6 at this moment
GSBe 0V; Item is that the PMOS pipe of VT1, VT6 is in cut-off state immediately, power cutoff output, and then the relay K 2 of power control circuit unit 1 is because drive current is 0; Relay K 2 is in off-state; Thoroughly broken off the power channel of stand-by power supply and load, also broken off simultaneously being connected of relay K 1 of stand-by power supply and power control circuit unit 1, guaranteed that stand-by power supply has no to export.
Under-voltage at main power source, switch to stand-by power supply after, through voltage monitoring chip D1 control; Capacitor C 2 is discharged via resistance R 14, R15 over the ground, after the time T, because capacitor C 2 has been put; Triode VT5 ends, and the item of time delay circuit unit 5 is that the G utmost point of the PMOS pipe of VT6 is in high-impedance state, and item is that the leakage current of the PMOS pipe of VT6 has been not enough to drive load and relay K 2; 2 pin of relay K 2 and 3 pin break off, and 4 pin and 5 pin also break off simultaneously, and stand-by power supply cuts off the output of load and voltage monitoring chip D1 fully; Thereby guaranteed that after the main power source power down time after stand-by power supply was the electric time T, stand-by power supply also broke off.
After the main power source power down, time delay circuit unit 5 realizes keeping of time T, because time delay circuit unit 5 discharges, T is after the time, and triode VT5 is in cut-off state, and causing item is that the PMOS pipe of VT6 also is in cut-off state, turn-offs the output of stand-by power supply.
When the inverted reset switch (RESET*) of voltage monitoring chip D1 was high level, the item of Backup Power Switch circuit unit 4 was the V of the PMOS pipe of VT4
GSBe 0V, item is that the PMOS pipe of VT4 is in cut-off state, and D, S the two poles of the earth pinch off have been realized the function that stand-by power supply cuts out;
Simultaneously, after duration T, the voltage of time delay circuit unit 5 is reduced to 0V, and the relay K 2 of power control circuit unit 1 is broken off external all outputs of stand-by power supply, has saved the electric energy of stand-by power supply.
In the embodiment of the invention, time delay circuit unit 5 has guaranteed that it is electric that the voltage monitoring chip D1 (MAX708SCSA) of control switching circuit unit 2 under any circumstance has normal working power; And after the time, also cut off the path of stand-by power supply at main power source power down T, saved the electric energy of stand-by power supply to voltage monitoring chip D1 (MAX708SCSA) power supply.
Preferably, but as a kind of execution mode, said time T can be through the selection adjustment of circuit parameter, and the time (change capacity or discharging current) of promptly discharging through the capacitor C 2 of control time delay circuit unit 5 is adjusted time T.More preferably, said time T is 1～8 second (s).
Should be noted that at last that obviously those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these revise and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification.
Claims (17)
1. main power supply switching control, it is connected to outside main power source and stand-by power supply, it is characterized in that, comprises the power control circuit unit, the control switching circuit unit, main power switch circuit unit and Backup Power Switch circuit unit, wherein:
Said power control circuit unit is used for controlling said control switching circuit unit and carrying out normal power supply under the situation of or power down normal at said main power source;
Said control switching circuit unit is used for after main power voltage is lower than threshold value, controls said main power switch circuit unit and breaks off, and carries out seamless switching, and the said Backup Power Switch circuit unit of conducting utilizes said stand-by power supply normal power supply;
Said main power switch circuit unit is used under said control switching circuit unit controls, and the said main power source normal power supply of conducting perhaps breaks off said main power source;
Said Backup Power Switch circuit unit is used under said control switching circuit unit controls, and the said stand-by power supply normal power supply of conducting perhaps breaks off said stand-by power supply.
2. main power supply switching control according to claim 1; It is characterized in that, also comprise time delay circuit unit, be used to be controlled at said main power source power down; After switching to said stand-by power supply; When time-delay reaches time T, stop to be the power supply of said control switching circuit unit, control Backup Power Switch circuit unit breaks off stand-by power supply.
3. main power supply switching control according to claim 2 is characterized in that, also comprises main power source anti-back flow circuit unit and stand-by power supply anti-back flow circuit unit;
Said main power source anti-back flow circuit unit is used in said main power source power down, and under the situation of said stand-by power supply normal power supply, control makes that not having the anti-electric current of irritating pours into said main power source;
Said stand-by power supply anti-back flow circuit unit is used for cutting off in said stand-by power supply output, and under the situation of said main power source normal power supply, control makes that not having the anti-electric current of irritating pours into said stand-by power supply.
4. main power supply switching control according to claim 1 is characterized in that, said power control circuit unit comprises diode VD1, binary channels single-pole double throw type relay K 1, binary channels open type relay K 2;
Diode VD1 directly is connected with main power source;
Said main power source is connected with said relay K 1; Said relay K 1 also is connected with said relay K 2; Said relay K 1 also is connected with said control switching circuit unit;
Said relay K 2 is connected with said stand-by power supply; Said relay K 2 also links to each other with said stand-by power supply anti-back flow circuit unit; Said relay K 2 is connected with said power control circuit unit.
5. main power supply switching control according to claim 1 is characterized in that, said control switching circuit unit comprises voltage monitoring chip D1, resistance R 1, resistance R 2;
Said resistance R 1 is connected with said resistance R 2, to the dividing potential drop of said main power source; Voltage accesses to said voltage monitoring chip D1 after the dividing potential drop, and said voltage monitoring chip D1 monitors said main power source.
6. main power supply switching control according to claim 5 is characterized in that, said voltage monitoring chip D1 comprises reset switch and inverted reset switch;
Said reset switch is controlled said main power switch circuit unit; Said inverted reset switch is controlled said Backup Power Switch circuit unit; The signal of said inverted reset switch and said reset switch is embodied as a pair of interlocking signal in said voltage monitoring chip D1 inside.
7. main power supply switching control according to claim 6 is characterized in that, said voltage monitoring chip D1 is the MAX708SCSA chip.
8. main power supply switching control according to claim 6 is characterized in that, said threshold value V
THBe 90% of normal voltage value.
9. main power supply switching control according to claim 6 is characterized in that, resistance R is passed through in said threshold value setting
2And R
1Adjustment is set, i.e. threshold value
Wherein, V
REFThe reference voltage of expression threshold setting.
10. according to claim 2 or 3 described main power supply switching controls, it is characterized in that said time delay circuit unit comprises resistance R 14, R15, R17, capacitor C 2 and triode VT5;
Said resistance R 14, R15 series connection, the collector electrode of dividing potential drop, the said triode VT5 of control and the conducting of emitter or end;
The base stage of said triode VT5 is connected between said resistance R 14 and the R15, the direct ground connection of emitter, and collector electrode is pulled to the voltage monitoring chip D1 of said switch control unit via said resistance R 17.
11. main power supply switching control according to claim 3; It is characterized in that; Said main power switch circuit unit, Backup Power Switch circuit unit, main power source anti-back flow circuit unit, stand-by power supply anti-back flow circuit unit comprise PMOS pipe respectively.
12., it is characterized in that said time T is through the selection adjustment of circuit parameter according to the said main power supply switching control of claim 2, the time of promptly discharging through the capacitor C 2 of control time delay circuit unit is adjusted.
13., it is characterized in that said time T is 1-8 second according to the said main power supply switching control of claim 12.
14. a main power supply method for handover control is characterized in that, comprises the steps:
Step S100 carries out under-voltage detection to main power voltage, when voltage just often, control main power source powering load is controlled stand-by power supply simultaneously and is forbidden powering load;
Step S200, when detecting main power source when under-voltage, the main power source powering load is forbidden in control, and seamlessly switches to stand-by power supply, by the stand-by power supply powering load.
15. main power supply method for handover control according to claim 14 is characterized in that, also comprises the steps:
Step S300, after main power source power down, cut-in stand-by power supply were supplied power, when time-delay reached time T, the control stand-by power supply broke off, and forbids supplying power to load.
16., it is characterized in that said step S100 comprises the steps: according to right 14 or 15 described main power supply method for handover control
Step S110 cuts off in stand-by power supply output, and under the situation of main power source powering load, control makes that not having the anti-electric current of irritating pours into stand-by power supply.
17. main power supply method for handover control according to claim 16 is characterized in that said step S200 comprises the steps:
Step S210, in the main power source power down, under the situation of stand-by power supply powering load, control makes that not having the anti-electric current of irritating pours into main power source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105214189A CN102447302A (en) | 2010-09-30 | 2010-10-27 | Main-standby power supply switching control method and device |
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| CN201010298153 | 2010-09-30 | ||
| CN201010298153.0 | 2010-09-30 | ||
| CN2010105214189A CN102447302A (en) | 2010-09-30 | 2010-10-27 | Main-standby power supply switching control method and device |
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| CN102447302A true CN102447302A (en) | 2012-05-09 |
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| CN2010105214189A Pending CN102447302A (en) | 2010-09-30 | 2010-10-27 | Main-standby power supply switching control method and device |
| CN2010205789317U Expired - Fee Related CN201830014U (en) | 2010-09-30 | 2010-10-27 | Switching control device for main and standby power sources |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205789317U Expired - Fee Related CN201830014U (en) | 2010-09-30 | 2010-10-27 | Switching control device for main and standby power sources |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6313548B1 (en) * | 1998-12-16 | 2001-11-06 | Hochiki Kabushiki Kaisha | Power switching device |
| CN2509766Y (en) * | 2001-05-09 | 2002-09-04 | 凌岩 | Switch source of double-channel power source input |
| CN2859903Y (en) * | 2005-12-08 | 2007-01-17 | 新疆新能源股份有限公司 | Main inverter power switching device |
| CN201830014U (en) * | 2010-09-30 | 2011-05-11 | 苏州捷泰科信息技术有限公司 | Switching control device for main and standby power sources |
-
2010
- 2010-10-27 CN CN2010105214189A patent/CN102447302A/en active Pending
- 2010-10-27 CN CN2010205789317U patent/CN201830014U/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6313548B1 (en) * | 1998-12-16 | 2001-11-06 | Hochiki Kabushiki Kaisha | Power switching device |
| CN2509766Y (en) * | 2001-05-09 | 2002-09-04 | 凌岩 | Switch source of double-channel power source input |
| CN2859903Y (en) * | 2005-12-08 | 2007-01-17 | 新疆新能源股份有限公司 | Main inverter power switching device |
| CN201830014U (en) * | 2010-09-30 | 2011-05-11 | 苏州捷泰科信息技术有限公司 | Switching control device for main and standby power sources |
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