CN201830014U - Switching control device for main and standby power sources - Google Patents
Switching control device for main and standby power sources Download PDFInfo
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- CN201830014U CN201830014U CN2010205789317U CN201020578931U CN201830014U CN 201830014 U CN201830014 U CN 201830014U CN 2010205789317 U CN2010205789317 U CN 2010205789317U CN 201020578931 U CN201020578931 U CN 201020578931U CN 201830014 U CN201830014 U CN 201830014U
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Abstract
The utility model discloses a switching control device for main and standby power sources. The device is connected with an external main power source and an external standby power source and comprises a power source control circuit unit, a switching control circuit unit, a main power source switching circuit unit and a standby power source switching circuit unit; the power source control circuit unit controls the switching control circuit unit for the normal power supply in the situation that the main power source is normal or breaks off; when the voltage of the main power source is smaller than the threshold; the switching control circuit unit controls the main power source switching circuit unit to disconnect for seamless switching, conducts the standby power source switching circuit unit and uses the standby power source for the normal power supply; under the control of the switching control circuit unit, the main power source switching circuit unit conducts the main power source for the normal power supply or disconnects the main power source; and under the control of the switching control circuit unit, the standby power source switching circuit unit conducts the standby power source for the normal supply or disconnects the standby power source. The switching control device realizes the seamless switching between the main power source and the standby source.
Description
Technical field
The utility model relates to a kind of automatic control technology field, particularly relates to a kind of main power supply switching control.
Background technology
When carrying out electronic equipment or design of electronic circuits, by main power source load is powered usually, if break down can not the bio-occlusion electric for main power source,, usually need main power source is provided with backup battery for raising equipment or reliability of system operation.
Chinese patent application number is the switching control that 200610060875.6 utility application discloses a kind of main power supply, and described device comprises: according to main power source with close the main road switch control unit that the pressure reduction control main power source supply access of road output voltage is opened and turn-offed; And the standby 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 standby switch control unit comprise the low pressure drop switching component that a control power path is opened and turn-offed respectively.
Chinese patent application number is the device that 200710165110.3 utility application discloses another 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 China Patent No. 200820055923.7 discloses a kind of main power supply from cutting apparatus, this device comprises autotomy circuit and warning device, and the described 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 finish 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 powered to load always, shorten the service time and the useful life of stand-by power supply.
The utility model content
The purpose of this utility model is to provide a kind of main power supply switching control, and it realizes the seamless switching between the main power supply.
Be a kind of main power supply switching control of realizing that the utility model purpose 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:
Under the situation of described power control circuit unit or power down normal, control described control switching circuit unit and carry out normal power supply at described main power source;
After main power voltage was lower than threshold value, the described main power switch circuit of described control switching circuit unit controls unit disconnected, and carries out seamless switching, and the described Backup Power Switch circuit unit of conducting utilizes described stand-by power supply normal power supply;
Described main power switch circuit unit under described control switching circuit unit controls, the described main power source normal power supply of conducting or disconnect described main power source;
Described Backup Power Switch circuit unit under described control switching circuit unit controls, the described stand-by power supply normal power supply of conducting or disconnect described stand-by power supply.
More preferably, described main power supply switching control also comprises time delay circuit unit; In described main power source power down, switch to described stand-by power supply after, when described time delay circuit unit control time-delay reached time T, stopping was the power supply of described control switching circuit unit, control Backup Power Switch circuit unit disconnects stand-by power supply.
More preferably, 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;
Described main power source anti-back flow circuit unit is in described main power source power down, and under the situation of described stand-by power supply normal power supply, control makes that not having the anti-electric current of irritating pours into described main power source;
Described stand-by power supply anti-back flow circuit unit cuts off in described stand-by power supply output, and under the situation of described main power source normal power supply, control makes that not having the anti-electric current of irritating pours into described stand-by power supply.
More preferably, described 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;
Described main power source is connected with described relay K 1; Described relay K 1 also is connected with described relay K 2; Described relay K 1 also is connected with described control switching circuit unit;
Described relay K 2 is connected with described stand-by power supply; Described relay K 2 also links to each other with described stand-by power supply anti-back flow circuit unit; Described relay K 2 is connected with described power control circuit unit.
More preferably, described control switching circuit unit comprises voltage monitoring chip D1, resistance R 1, resistance R 2;
Described resistance R 1 is connected with described resistance R 2, to the dividing potential drop of described main power source; Voltage accesses to described voltage monitoring chip D1 after the dividing potential drop, and described voltage monitoring chip D1 monitors described main power source.
More preferably, described voltage monitoring chip D1 comprises reset switch and inverted reset switch;
Described reset switch is controlled described main power switch circuit unit; Described inverted reset switch is controlled described Backup Power Switch circuit unit; The signal of described inverted reset switch and described reset switch is embodied as a pair of interlocking signal in described voltage monitoring chip D1 inside.
More preferably, described voltage monitoring chip D1 is the MAX708SCSA chip.
More preferably, described time delay circuit unit comprises resistance R 14, R15, R17, capacitor C 2 and triode VT5;
Described resistance R 14, R15 series connection, the collector electrode of dividing potential drop, the described triode VT5 of control and the conducting of emitter or end;
The base stage of described triode VT5 is connected between described resistance R 14 and the R15, the direct ground connection of emitter, and collector electrode is pulled to the voltage monitoring chip D1 of described switch control unit via described resistance R 17.
The beneficial effects of the utility model are: main power supply switching control of the present utility model 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, finish 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 the utility model embodiment main power supply switching control structural representation;
Fig. 2 is the utility model embodiment main power supply switching control circuit diagram.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, main power supply switching control of the present utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 1, 2, wherein, Fig. 1 is the utility model embodiment main power supply switching control structural representation; Fig. 2 is the utility model embodiment main power supply switching control circuit diagram.
As a kind of embodiment, a kind of main power supply switching control of the utility model embodiment, 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, described main power supply switching control also comprises time delay circuit unit 5.
More preferably, described 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.
Describe each circuit unit of the main power supply switching control of the utility model embodiment below in detail.
Described 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, as a kind of embodiment, described 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.
As a kind of embodiment, 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, 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 realize being connected of power control circuit unit 1 and 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.
By 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, power by main power supply by 1 control control switching circuit unit 2, power control circuit unit.
Described 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 disconnects, 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, as a kind of embodiment, control switching circuit unit 2 comprises voltage monitoring chip D1, resistance R 1, resistance R 2;
Resistance R 1 is connected with resistance R 2, to the dividing potential drop of main power source; Voltage accesses to voltage monitoring chip D1 after the dividing potential drop, and voltage monitoring chip D1 monitors main power source, is lower than threshold value V at main power voltage
THThe time, control main power switch circuit unit 3 disconnects main power source, and conducting Backup Power Switch circuit unit 4 carries out normal power supply for load.
Among the utility model embodiment,, 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 embodiment; 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, as a kind of embodiment, described voltage monitoring chip D1 is the MAX708SCSA chip, and it adopts integrated device, the reliability height, and save the plate area;
Preferably, described threshold value V
THBe 90% of normal voltage value.More preferably, resistance R is passed through in described threshold value setting
2And R
1Adjustment is set.It is threshold value
Wherein, V
REFThe reference voltage of expression threshold setting.
More preferably, described V
REF=1.25V.
As a kind of embodiment, be in the MAX708SCSA chip at voltage monitoring chip D1, 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, disconnects Backup Power Switch circuit unit 4.
Main power switch circuit unit 3 is used under 2 controls of control switching circuit unit conducting main power source normal power supply or disconnection main power source.
Backup Power Switch circuit unit 4 is used under 2 controls of control switching circuit unit power supply of conducting stand-by power supply or disconnection stand-by power supply.
As a kind of embodiment, main power switch circuit unit 3 and Backup Power Switch circuit unit 4 are realized by PMOS (Positive channel Metal Oxide Semiconductor) pipe.
Described 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.
Described 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 of the PMOS pipe of VT6 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 of the PMOS pipe of VT7 is connected with 3 pin.
Described 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 disconnects stand-by power supply.
Described 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 disconnects 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;
Described 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 restriction charging currents.
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.
Described 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.
Described 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.
As a kind of embodiment, described main power source anti-back flow circuit unit 6 and stand-by power supply anti-back flow circuit unit 7 are realized by the PMOS pipe.
As shown in Figure 2, as a kind of embodiment, described main power source anti-back flow circuit unit 6 comprises that item is the PMOS pipe of VT2, and described 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; Described 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 described 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 of the PMOS pipe of VT6 is connected;
Described stand-by power supply anti-back flow circuit unit 7 comprises that item is the PMOS pipe of VT7, described item is 3 pin that the D utmost point of the PMOS pipe of VT7 is succeeded electrical equipment K2, described 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 described 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 the utility model embodiment main power supply switching controls guarantees can be the load normal power supply, and when the main power source power down, to seamlessly switch to stand-by power supply under the situation of the normal or 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 utility model embodiment 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.
The course of work of the main power supply switching control of the utility model embodiment is described in further detail below, 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;
By 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 disconnect, 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 disconnect, the relay K 2 of power control circuit unit 1 is in closure state at this moment, 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.
As a kind of embodiment, 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, described 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 by 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 by 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 by item, after being full of electricity, item is the triode conducting of VT5, 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 by 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.
Among the utility model embodiment, under normal circumstances, by the main power source power supply, stand-by power supply is in static state fully fully in load.
Among the utility model embodiment, 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, described 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.
By 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 disconnects, 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, 5 pin and 6 pin, 3 pin and 4 pin disconnect, (K2 disconnects for the relay K 2 of power control circuit unit 1, K1 at this moment, but the K1 closure) 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.
As a kind of embodiment, 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 by relay K 2, K1, voltage monitoring chip D1 work;
As a kind of embodiment, when the voltage of main power source is lower than
The time, the reversed-phase output of voltage monitoring chip D1 (PFO* end) output is continuously low level, and reset switch this moment (RESET) is a high level, and 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, 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, item is that the PMOS pipe of VT2, VT3 is in cut-off state, disconnect 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 the PMOS of VT4 manages conducting (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.
More preferably, described 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 powered, when time-delay reached time T, the control stand-by power supply disconnected, and forbids powering to load.
Among the utility model embodiment, 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.
By the control of time delay circuit unit 5, after stand-by power supply contactor 4 ON time reached time T, time delay circuit unit 5 control stand-by power supply contactors 4 disconnected, 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 over the ground by electric capacity R14, R15, 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, 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 disconnected the power channel of stand-by power supply and load, also disconnected 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, after switching to stand-by power supply, through voltage monitoring chip D1 control, capacitor C 2 is via resistance R 14, R15 discharges 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 disconnect, 4 pin and 5 pin also disconnect simultaneously, and stand-by power supply cuts off fully to the output of load and voltage monitoring chip D1, thereby has guaranteed after the main power source power down time, after stand-by power supply was the electric time T, stand-by power supply also disconnected.
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 disconnects external all outputs of stand-by power supply, has saved the electric energy of stand-by power supply.
Among the utility model embodiment, 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, as a kind of embodiment, described time T can be by the selection adjustment of circuit parameter, and promptly the time (change capacity or discharging current) of discharging by the capacitor C 2 of control time delay circuit unit 5 is adjusted time T.More preferably, described 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 utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these revise and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification.
Claims (8)
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:
Under the situation of described power control circuit unit or power down normal, control described control switching circuit unit and carry out normal power supply at described main power source;
After main power voltage was lower than threshold value, the described main power switch circuit of described control switching circuit unit controls unit disconnected, and carries out seamless switching, and the described Backup Power Switch circuit unit of conducting utilizes described stand-by power supply normal power supply;
Described main power switch circuit unit under described control switching circuit unit controls, the described main power source normal power supply of conducting or disconnect described main power source;
Described Backup Power Switch circuit unit under described control switching circuit unit controls, the described stand-by power supply normal power supply of conducting or disconnect described stand-by power supply.
2. main power supply switching control according to claim 1 is characterized in that, also comprises time delay circuit unit;
In described main power source power down, switch to described stand-by power supply after, when described time delay circuit unit control time-delay reached time T, stopping was the power supply of described control switching circuit unit, control Backup Power Switch circuit unit disconnects 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;
Described main power source anti-back flow circuit unit is in described main power source power down, and under the situation of described stand-by power supply normal power supply, control makes that not having the anti-electric current of irritating pours into described main power source;
Described stand-by power supply anti-back flow circuit unit cuts off in described stand-by power supply output, and under the situation of described main power source normal power supply, control makes that not having the anti-electric current of irritating pours into described stand-by power supply.
4. main power supply switching control according to claim 1 is characterized in that, described 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;
Described main power source is connected with described relay K 1; Described relay K 1 also is connected with described relay K 2; Described relay K 1 also is connected with described control switching circuit unit;
Described relay K 2 is connected with described stand-by power supply; Described relay K 2 also links to each other with described stand-by power supply anti-back flow circuit unit; Described relay K 2 is connected with described power control circuit unit.
5. main power supply switching control according to claim 1 is characterized in that, described control switching circuit unit comprises voltage monitoring chip D1, resistance R 1, resistance R 2;
Described resistance R 1 is connected with described resistance R 2, to the dividing potential drop of described main power source; Voltage accesses to described voltage monitoring chip D1 after the dividing potential drop, and described voltage monitoring chip D1 monitors described main power source.
6. main power supply switching control according to claim 5 is characterized in that, described voltage monitoring chip D1 comprises reset switch and inverted reset switch;
Described reset switch is controlled described main power switch circuit unit; Described inverted reset switch is controlled described Backup Power Switch circuit unit; The signal of described inverted reset switch and described reset switch is embodied as a pair of interlocking signal in described voltage monitoring chip D1 inside.
7. main power supply switching control according to claim 6 is characterized in that, described voltage monitoring chip D1 is the MAX708SCSA chip.
8. according to claim 2 or 3 described main power supply switching controls, it is characterized in that described time delay circuit unit comprises resistance R 14, R15, R17, capacitor C 2 and triode VT5;
Described resistance R 14, R15 series connection, the collector electrode of dividing potential drop, the described triode VT5 of control and the conducting of emitter or end;
The base stage of described triode VT5 is connected between described resistance R 14 and the R15, the direct ground connection of emitter, and collector electrode is pulled to the voltage monitoring chip D1 of described switch control unit via described resistance R 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205789317U CN201830014U (en) | 2010-09-30 | 2010-10-27 | Switching control device for main and standby power sources |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010298153 | 2010-09-30 | ||
| CN201010298153.0 | 2010-09-30 | ||
| CN2010205789317U CN201830014U (en) | 2010-09-30 | 2010-10-27 | Switching control device for main and standby power sources |
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| Publication Number | Publication Date |
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| CN201830014U true CN201830014U (en) | 2011-05-11 |
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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 |
| CN2010105214189A Pending CN102447302A (en) | 2010-09-30 | 2010-10-27 | Main and standby power supply switching control method and device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105214189A Pending CN102447302A (en) | 2010-09-30 | 2010-10-27 | Main and standby power supply switching control method and device |
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| CN (2) | CN201830014U (en) |
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