CN107546838A - Power circuit, power up control circuit and method - Google Patents
Power circuit, power up control circuit and method Download PDFInfo
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- CN107546838A CN107546838A CN201610465364.6A CN201610465364A CN107546838A CN 107546838 A CN107546838 A CN 107546838A CN 201610465364 A CN201610465364 A CN 201610465364A CN 107546838 A CN107546838 A CN 107546838A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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Abstract
The invention discloses a kind of power circuit, power up control circuit and method, the sample circuit of power up control circuit is in AC/DC power cut-off recovery processs, output to AC/DC power supplys samples, then it is the target voltage values more than stand-by power supply (such as battery) output voltage by the output voltage setting of AC/DC power settings when the control circuit of power up control circuit judges that the output voltage of AC/DC power supplys is lower than the stand-by power supply output voltage currently powered according to sampled result.After can so ensureing that the system short time has a power failure, the output voltage Vout of power supply is normally established, and then is realized in AC/DC power cut-off recovery processs, the seamless switching of reserve battery and AC/DC power supplys to system power supply.The mode of relatively existing oring circuits control, scheme provided in an embodiment of the present invention is more simple, and cost is also relatively lower, and the efficiency of power supply is had no significant effect.
Description
Technical field
The present invention relates to field of power supplies, more particularly to a kind of power circuit, power up control circuit and method.
Background technology
The communication system of some AC/DC communication power supplies application, such as interchanger, need to be equipped with storage under some application scenarios
Battery, to meet that the power-off of civil power short time does not influence the requirement of some business of system.On these systems, the discharge and recharge of battery
Management circuit can be integrated in inside communication power supply, can also be integrated in internal system, as shown in Figure 1.This system in Fig. 1
Configuration, the output of power supply is directly connected with the dc bus of system, and after civil power powers off, the charge management circuit in system receives
The AC power fail warning signals brought to AC/DC power supplys (hereinafter referred to as power supply), then controlling switch S1 closures, are given by battery
System power supply.Due to AC power failure warning circuits act and recover be usually quickly, behind city power recovery, battery charging and discharging management
Circuit can quickly detect AC power fail warnings signal and recover normal, now if disconnecting switch S1 immediately, it is possible to power supply
Output voltage Vout is not set up also, so as to cause the system short time to power off.
Another situation is after internal system detects that AC power fail warnings signal recovers normal, to disconnect switch again by delay
S1, but it is possible there is also one kind, i.e., and if civil power power-off time is shorter, the residual voltage of battery can be than the output of power settings
Voltage is high.If power supply output does not have Oring circuits, then behind city power recovery, on the pwm chip of power source internal starts
Electricity work, the control loop of power supply detects that the output of power supply has had voltage (i.e. cell voltage), and is set than power supply itself
Fixed output voltage is high, then the PWM chip of power supply would not go out driving again, cause the Vout voltage of power supply itself always can not
Establish.Even delay disconnects S1 in this case, still because electric power output voltage can not be established immediately system can be caused short
Time powers off.If on the contrary, power supply output band Oring circuits in Fig. 1, then behind city power recovery, cell voltage will not
Influence electric power output voltage Vout to establish, after system detectio to AC power fail warnings signal recovers normal, one section of delay can be passed through
Switch S1 is disconnected after time again, so as to realize the seamless switching of battery and AC/DC power supplys to system power supply.But at present to being all logical
Cross the seamless switching of Oring circuit realirations battery and AC/DC power supplys to system power supply, it is of the invention then propose that another is different from
Another control program of Oring circuits realizes the seamless switching of battery and AC/DC power supplys to system power supply.
The content of the invention
The embodiment of the present invention is solution：In AC/DC power cut-off recovery processs, realize battery and AC/DC power supplys to being
The seamless switching of system power supply, there is provided a kind of power circuit, power up control circuit and method.
The power up control circuit that one embodiment of the invention provides, including sample circuit and control circuit；The sampling
Circuit is connected with AC/DC power output ends and the control circuit input respectively；The control circuit output end and AC/DC electricity
Source control terminal connection；
The sample circuit is used in AC/DC power cut-off recovery processs, and the output to AC/DC power supplys samples；
The control circuit is used to judge the output voltage of the AC/DC power supplys than current power supply according to the sampled result
Stand-by power supply output voltage it is low when, by the output voltage setting of the AC/DC power settings to be defeated more than the stand-by power supply
Go out the target voltage values of voltage.
Another embodiment of the present invention provides a kind of power circuit, including AC/DC power supplys, stand-by power supply and as described above
Power up control circuit；
The stand-by power supply is connected with the AC/DC power output ends, for being supplied in AC/DC power cut-offs for load
Electricity；
The power up control circuit is used in AC/DC power cut-off recovery processs, and the output to AC/DC power supplys is entered
Row sampling, judges that the output voltage of the AC/DC power supplys is lower than the stand-by power supply output voltage currently powered according to sampled result
When, it is the target voltage values more than the stand-by power supply output voltage by the output voltage setting of the AC/DC power settings.
Another embodiment of the present invention provides a kind of power up control method, including：
In AC/DC power cut-off recovery processs, the output to AC/DC power supplys samples；
Judge that the output voltage of the AC/DC power supplys is lower than the stand-by power supply output voltage currently powered according to sampled result
When, it is the target voltage values more than the stand-by power supply output voltage by the output voltage setting of the AC/DC power settings.
A technical scheme in above-mentioned technical proposal has the advantages that：
The sample circuit of power up control circuit is in AC/DC power cut-off recovery processs, the output to AC/DC power supplys
Sampled, the control circuit of power up control circuit judges the output voltage of AC/DC power supplys than current according to sampled result
When the stand-by power supply output voltage of power supply is low, then by the output voltage setting of AC/DC power settings be more than stand-by power supply (such as
Battery-backed power source etc.) output voltage target voltage values.It can so ensure electric power output voltage than the battery currently powered
Voltage is high, and the output voltage Vout of power supply is normally established, and then realizes in AC/DC power cut-off recovery processs, reserve battery
Seamless switching with AC/DC power supplys to system power supply.The mode of relatively existing oring circuits control, the embodiment of the present invention provide
Scheme it is more simple, cost is also relatively lower, and the efficiency of power supply is had no significant effect.
Brief description of the drawings
Fig. 1 is a kind of power supply circuit system block diagram with reserve battery；
Fig. 2 is the control method schematic flow sheet that the power cut-off that first embodiment of the invention provides recovers；
Fig. 3 is the power up control circuit structural representation that first embodiment of the invention provides；
Fig. 4 is that the AC/DC electric power output voltages that first embodiment of the invention provides fluctuate schematic diagram；
Fig. 5 is a kind of selectable concrete structure schematic diagram of sample circuit in Fig. 3；
Fig. 6 is a kind of selectable concrete structure schematic diagram one of sample circuit in Fig. 5；
Fig. 7 is a kind of selectable concrete structure schematic diagram two of sample circuit in Fig. 5；
Fig. 8 is the power up control circuit structural representation one that second embodiment of the invention provides；
Fig. 9 is the power up control circuit structural representation two that second embodiment of the invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment in the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment one：
The control that the present embodiment recovers to AC/DC power cut-offs is realized using the control process shown in Fig. 2：
S201：In AC/DC power cut-off recovery processs, the output to AC/DC power supplys samples；
In this step, at least one of the voltage of the output of AC/DC power supplys, electric current can specifically be sampled.And
Specific sampling circuit used and sampling rule can flexibly be set according to practical application scene.
S202：Whether the output voltage for judging AC/DC power supplys according to sampled result exports than the stand-by power supply currently powered
Voltage is low, in this way, goes to S203；Otherwise, S204. is gone to
S203:It is the target voltage values more than stand-by power supply output voltage by the output voltage setting of AC/DC power settings.
It can so ensure that the voltage of stand-by power supply of the output voltage than currently powering of AC/DC power supplys is high, the driving chip of power supply is just
Normal output drive signal so that power supply start simultaneously normally establishes output voltage Vout.
S204：The output voltage readjustment of AC/DC power settings is arranged to normal output voltage value.Break in AC/DC power supplys
In electric recovery process, the output voltages of AC/DC power supplys can recurrent fluctuations, when detecting the defeated of AC/DC power supplys again by S201
Go out stand-by power supply output voltage of the voltage again than currently powering it is low when, then go to S203 by the output voltage of AC/DC power settings
It is re-set as the target voltage values more than stand-by power supply output voltage.An electric power output voltage is so begun to around standby
One process of supply voltage recurrent fluctuations, until the power switch of backup power source voltage disconnects, all system loads are all by AC/
D/C power undertakes, and AC/DC electric power output voltages no longer fluctuate, and return to normal value.So it is achieved that in AC/DC power cut-offs
The seamless switching of reserve battery and AC/DC power supplys to system power supply in recovery process.
In order to be better understood from the present invention, with reference to a kind of power up control circuit to realizing the control shown in Fig. 2
Process is illustrated.But it is to be understood that all circuit structures that can realize control process shown in Fig. 2 all should be in this hair
In bright protection domain, it is not limited in the present embodiment circuit structure shown below.
Shown in Figure 3, the power up control circuit in the present embodiment includes sample circuit 31 and control circuit 32；Its
In, sample circuit 31 is connected with AC/DC power output ends and control circuit input respectively；Control circuit output end and AC/DC
Power control terminal (not shown) connects；
Sample circuit 31 is used in AC/DC power cut-off recovery processs, and the output to AC/DC power supplys samples；
Control circuit 32 is used to judge the output voltage of AC/DC power supplys than current power supply according to the sampled result of sample circuit
Stand-by power supply output voltage it is low when, by the output voltage setting of AC/DC power settings be more than stand-by power supply output voltage
Target voltage values.It can so ensure that the voltage of stand-by power supply of the output voltage than currently powering of AC/DC power supplys is high, power supply
The normal output drive signal of driving chip so that power supply start simultaneously normally establishes output voltage Vout.It is standby in the present embodiment
Power supply can be various battery supplies.
Control circuit 32 is more defeated than the stand-by power supply currently powered in the output voltage that AC/DC power supplys are judged according to sampled result
Go out voltage it is high when, by the output voltage of AC/DC power settings by target voltage values readjustment be normal output voltage value.
In AC/DC power cut-off recovery processs, the output voltage meeting recurrent fluctuations of AC/DC power supplys, when control circuit 32
When detecting that stand-by power supply output voltage of the output voltage of AC/DC power supplys again than currently powering is low again by sampled result,
The output voltage of AC/DC power settings is then re-set as the target voltage values more than stand-by power supply output voltage.So control
Circuit 32 processed can control AC/DC electric power output voltages to surround backup power source voltage recurrent fluctuations according to sampled result, referring to Fig. 4 institutes
Show.Until the power switch of backup power source voltage disconnects, all system loads are all undertaken by AC/DC power supplys, the output of AC/DC power supplys
Voltage no longer fluctuates, and returns to normal value.
Originally it is that sample circuit 31 in embodiment specifically can be at least one in the output voltages of AC/DC power supplys, electric current
Kind is sampled.And the circuit used in specific sampling can flexibly be set with sampling rule according to practical application scene.For example,
Shown in Figure 5, sample circuit 31 can specifically include main sample circuit 311 and auxiliary sample circuit 312.Wherein main sample circuit
311 specifically can be used for sampling the output voltage of AC/DC power supplys, and auxiliary sample circuit 312 then specifically can be to AC/DC
The output voltage or electric current of power supply are sampled, and the output of main sample circuit 311 is adjusted according to sampled result.Separately below with
Auxiliary sample circuit 312 illustrates exemplified by being sampled to the output voltage or electric current of AC/DC power supplys.
Shown in Figure 6, the main sample circuit 311 in this example includes the first main partial pressure collection sub-circuit of series connection
3111 and the second main partial pressure collection sub-circuit 3112, the flyback transformation of the first main partial pressure collection sub-circuit 3111 and AC/DC power supplys
The main road output connection of device, the second main partial pressure collection sub-circuit 3112 are grounded；The main road output voltage of flyback transformer is AC/DC
Electric power output voltage.
Auxiliary sample circuit 312 includes the first auxiliary 3121 and second auxiliary partial pressure of partial pressure Acquisition Circuit collection sub-circuit of series connection
3122, the first auxiliary main partial pressure Acquisition Circuit 3121 and the bypass output of the flyback transformer of AC/DC power supplys connect, the second auxiliary partial pressure
Gather sub-circuit ground connection 3122；
Pass through individual event electric conduction between second auxiliary partial pressure collection sub-circuit 3122 and second main partial pressure collection sub-circuit 3112
Road connects, when the second main partial pressure collection sub-circuit 3112 voltage is higher than the second auxiliary partial pressure collection sub-circuit 3122, individual event electric conduction
Road turns on, and now the second auxiliary partial pressure collection sub-circuit 3122 is in parallel with the second main partial pressure collection sub-circuit 3112.Wherein, the second master
Partial pressure collection sub-circuit 3112 voltage be sample circuit output end output voltage, the comparison circuit of input control circuit 32.
Control circuit 32 includes comparison circuit 321, and two inputs of comparison circuit 321 export with sample circuit 31 respectively
End (namely A points of the second main partial pressure collection sub-circuit 3112) connects with reference voltage Vref.Comparison circuit 321 is by sample circuit
31 output voltage is compared with reference voltage Vref, during less than reference voltage, judges that the output voltage of AC/DC power supplys supplies than current
The stand-by power supply output voltage of electricity is low, booster tension control signal is sent to AC/DC power control terminals, by AC/DC power settings
Output voltage setting be target voltage values.Conversely, then judge the output voltage of AC/DC power supplys than the stand-by power supply currently powered
Output voltage is high, is sent to AC/DC power control terminals and carries readjustment voltage control signal, by the output voltage of AC/DC power settings
It is normal output voltage value by target voltage values readjustment.
In Fig. 6, the auxiliary winding of flyback transformer is used for providing the accessory power supply required for power supply secondary control circuit.This reality
Apply example can also set filter capacitor to be filtered processing in main road is exported and exported with bypass.
One-way conduction circuit in the present embodiment can use the various components that can realize one-way conduction control to realize, example
Such as diode, now the anode of diode is connected with A points, and negative electrode is connected with B points.
Have a power failure in the civil power short time recover again after, when AC/DC power supplys are just started shooting, it is defeated that backup battery voltage has been added in main road
On going out, but now bypass output voltage is not set up, therefore B points voltage is less than A point voltages, and one-way conduction circuit conducting, second is auxiliary
Partial pressure collection sub-circuit 3122 is in parallel with the second main partial pressure collection sub-circuit 3112, and the voltage that such A points obtain is less than reference
Vref voltages, send the target voltage that AC/DC electric power output voltages are set higher than cell voltage by booster tension control signal
Value, power supply PWM chip output drive signal, main road output are established.
Before main road output voltage is less than cell voltage, because of main road output, band does not carry, and bypass output voltage is relatively low, is joining
Ensure that B points voltage is less than A point voltages, one-way conduction circuit conducting in number design.Main road output electricity during to ensure that power supply is just started shooting
Pressure is more than backup battery voltage, if the resistance R1 of the first main partial pressure collection sub-circuit, the resistance of the second main partial pressure collection sub-circuit
R2, the second auxiliary partial pressure Acquisition Circuit resistance R4, then the relation of R1, R2, R4 and reference voltage Vref need to meet following formula
It is required that：
Vbat is stand-by power supply output voltage；The output voltage that Vref is equal to AC/DC power supplys is multiplied byR2//R4 is
Resistance resistance R2 and R4 in parallel.
So after AC/DC power supply normal boot-straps, main road output voltage is more than backup battery voltage, the main road output of power supply
Band carries, and now bypass voltage rises, and B points voltage is higher than A point voltages, and one-way conduction circuit shut-off, now main road output voltage is expired
Foot face relational expression, less than backup battery voltage.
At this moment because main road voltage is less than cell voltage, main road output reduces without load, bypass output voltage, one-way conduction electricity
Road turns on again, and the first main partial pressure collection sub-circuit 3121 participates in the sampling network of main road output again, causes main road to export
Voltage rises, higher than band carries again after cell voltage.The process of a repetition is so begun to, i.e. main road output voltage is continuous
Surround battery voltage ripple, until in Fig. 1 switch S1 disconnect, by reserve battery from system dc bus depart from.This
When because AC/DC Power supply belts carry, bypass output voltage is higher, one-way conduction circuit cut-off, main road output recover normal voltage.
Shown in Figure 7, the figure show the concrete structure schematic diagram of another sample circuit of the present embodiment.
Main sample circuit 311 includes the first main partial pressure collection sub-circuit 3111 and second main partial pressure collection sub-circuit of series connection
3112, the main road output of the first main partial pressure collection sub-circuit 3111 and the power transformer of AC/DC power supplys connects, the second main partial pressure
Collection sub-circuit 3112 is grounded；
Auxiliary sample circuit 312 includes current collector 31211, voltage allotment sub-circuit 31213 and switch control son electricity
Road 31212, the upper load in series of main road output of current collector 31211 and the power transformer of AC/DC power supplys, voltage allotment
Circuit 31213 is in parallel with the second main partial pressure collection sub-circuit 3112, and voltage dispensable circuit is provided with shut-off and switched；Switch control
The input of circuit 31212 is connected with current collector 31211 and switch reference voltage respectively, and output end connects with shut-off switch
Connect, its by current collector and switch reference voltage ratio compared with, during less than switch reference voltage, will shut-off switch closure, it is now electric
Pressure allotment sub-circuit 31213 is in parallel with the second main partial pressure collection sub-circuit 3112.A points are still the output of sample circuit 31 in Fig. 7
End.
Control circuit includes comparison circuit 321, two inputs of comparison circuit 321 respectively with the output end of sample circuit 31
Connect with reference voltage Vref, by the output voltage of sample circuit 31 compared with reference voltage Vref, during less than reference voltage, sentence
The output voltage of disconnected AC/DC power supplys is lower than the stand-by power supply output voltage currently powered, and sends and is lifted to AC/DC power control terminals
Voltage control signal, it is target voltage values by the output voltage setting of AC/DC power settings.Conversely, then judge AC/DC power supplys
Output voltage is higher than the stand-by power supply output voltage currently powered, and is sent to AC/DC power control terminals and carries readjustment voltage control letter
Number, it is normal output voltage value that the output voltage of AC/DC power settings is adjusted back by target voltage values.
After power failure behind city power recovery, the output of AC/DC power supplys is not set up also, and now electric power outputting current is zero, switch control
The control shut-off switch conduction of system circuit 31212, the voltage that such A points obtain are less than Vref voltages, and the output of power supply PWM chip is driven
Dynamic signal, main road output are established.
Before main road output voltage is less than cell voltage, because of main road output, band does not carry, and shut-off switch is constantly on.To protect
Output voltage is more than backup battery voltage, resistance R11, the second master point of the first main partial pressure collection sub-circuit when card power supply is just started shooting
Resistance R21, the resistance R31 and the reference voltage V of voltage allotment sub-circuit of pressure collection sub-circuitrefRelation need to ensure
Relational expression is set up below：
V in above formulabatFor stand-by power supply (battery) output voltage；VrefOutput voltage equal to AC/DC power supplys is multiplied byR21//R31 is resistance R21 and R31 resistance in parallel.
So after power supply normal boot-strap, main road output voltage is more than cell voltage, and the main road output band of power supply carries, at this moment
The switch control control of sub-circuit 31212 turns off switch OFF, and now main road output voltage meets following relational expression, less than battery electricity
Pressure.
At this moment because main road voltage is less than backup battery voltage, main road output is turned on again without load, shut-off switch, and voltage is adjusted
Participated in again in the sampling network of main road output with sub-circuit 31213, cause main road output voltage to rise, after cell voltage
Band carries again.So beginning to the process of a repetition, i.e. main road output voltage is constantly fluctuating around backup battery voltage,
Until the switch S1 disconnections in Fig. 1, reserve battery is departed from from the dc bus in system.Now because Power supply belt carries, shut-off is opened
Shut-off, main road output recover normal voltage.
Based on above-mentioned power up control circuit, the present embodiment additionally provides a kind of power circuit, including AC/DC power supplys,
Stand-by power supply and power up control circuit as described above；
Stand-by power supply is connected with AC/DC power output ends, for being load supplying in AC/DC power cut-offs；Power supply is extensive
Multiple control circuit is used in AC/DC power cut-off recovery processs, and the output to AC/DC power supplys samples, and is tied according to sampling
When fruit judges that the output voltage of AC/DC power supplys is lower than the stand-by power supply output voltage currently powered, by the defeated of AC/DC power settings
Go out the target voltage values that voltage is set greater than stand-by power supply output voltage.The output of AC/DC power supplys is judged according to sampled result
When the stand-by power supply output voltage that voltage ratio is currently powered is high, the output voltage readjustment of AC/DC power settings is arranged to normal
Output voltage values.In AC/DC power cut-off recovery processs, power up control circuit control electric power output voltage is around standby
Supply voltage recurrent fluctuations, until the power switch of backup power source voltage disconnects, all system loads are all held by AC/DC power supplys
Load, AC/DC electric power output voltages no longer fluctuate, and return to normal value.So it is achieved that in AC/DC power cut-off recovery processs
Seamless switching of middle reserve battery and the AC/DC power supply to system power supply.
Embodiment two：
In order to be better understood from the present invention, the scheme with two specific circuit structures to the embodiment of the present invention separately below
Do further illustration.
Power control circuit structural representation shown in Figure 8, the figure show the tool of control block diagram shown in corresponding diagram 6
Body circuit structure diagram.Wherein first main partial pressure collection sub-circuit 3111 and second main partial pressure collection sub-circuit 3112 respectively R1,
R2, the first auxiliary 3121 and second auxiliary partial pressure of partial pressure Acquisition Circuit collection sub-circuit 3122 is respectively R3, R4, and individual event turning circuit is
Diode VD1, accessory power supply SVCC.Comparison circuit 321 is realized using voltage error amplifier.
Structure shown in Fig. 8 is commonly used to the topology of flyback transformer.Main road output refers to that the power of transformer is defeated in figure
Go out loop (i.e. power supply is output to the voltage of system), also have on flyback transformer an assists winding (its export for bypass it is defeated
Go out), for providing the accessory power supply SVCC required for power supply secondary control circuit.Electric capacity C1 and C2 be respectively main road output and it is auxiliary
The filter capacitor of road output.
Main road output voltage gives voltage error amplifier after the sampling of R1 and R2 electric resistance partial pressures.Assists winding is exported through electricity
After hindering R3, R4 partial pressure, diode VD1 negative electrode is coupled to, the point among VD1 anode and R1 and R2 is connected.
The assists winding output of flyback transformer has a feature, i.e., when main road, which exports band, to be carried, bypass output voltage meeting
It is high during than main road output no-load.This example is exactly that make use of under different situations of the main road output with load and zero load, bypass output
The difference of voltage levels.
Have a power failure in the civil power short time recover again after, when AC/DC power supplys are just started shooting, cell voltage has been added in main road output
On, but now bypass output voltage is not set up, therefore B points voltage is less than A point voltages, diode VD1 conductings, resistance R4 and resistance
R2 is in parallel, and the voltage that such A points obtain is less than Vref voltages, power supply PWM chip output drive signal, and main road output is established.
Before main road output voltage is less than cell voltage, because of main road output, band does not carry, and bypass output voltage is relatively low, is joining
Ensure that B points voltage is less than A point voltages, VD1 conductings in number design.Output voltage is more than battery electricity during to ensure that power supply is just started shooting
Pressure, need in parameter designing to ensure that following relational expression is set up, below in relational expression R2//R4 represent R2 and R4 resistances in parallel.
So after power supply normal boot-strap, main road output voltage is more than cell voltage, and the main road output band of power supply carries, now
Auxiliary winding voltage rises, and B points voltage is higher than A point voltages, diode VD1 cut-offs, is now closed below main road output voltage satisfaction
It is formula, less than cell voltage.
At this moment because main road voltage is less than cell voltage, main road output reduces without load, bypass output voltage, diode VD1
Again turn on, R4 participate in again main road output sampling network in, cause main road output voltage rise, higher than after cell voltage again
Sub-band carries.The process of a repetition is so begun to, i.e. main road output voltage is constantly surrounding battery voltage ripple, Zhi Daotu
Switch S1 in 1 is disconnected, and battery is departed from from the dc bus in system.Now because Power supply belt carries, bypass output voltage is higher,
VD1 diodes end, and main road output recovers normal voltage.
Power control circuit structural representation shown in Figure 9, the figure show the tool of control block diagram shown in corresponding diagram 7
Body circuit structure diagram.Wherein, wherein the first main partial pressure collection sub-circuit 3111 and second main partial pressure collection sub-circuit 3112 is distinguished
For R11, R21, current collector 31211 is R (lsence), and voltage allotment sub-circuit 31213 is R31, switch control sub-circuit
31212 be comparator or amplifier, and shut-off switch is triode VT1, and switch reference voltage is V (lref), and comparison circuit 321 uses
Voltage error amplifier is realized.
After power failure behind city power recovery, the output of AC/DC power supplys is not set up also, and now electric power outputting current is zero, electric current inspection
Survey amplifier or comparator control VT1 conductings, the voltage that such A points obtain are less than Vref voltages, power supply PWM chip output driving letter
Number, main road output is established.
Before main road output voltage is less than cell voltage, because of main road output, band does not carry, and VT1 is constantly on.To ensure electricity
Output voltage is more than cell voltage when source is just started shooting, and needs to ensure that following relational expression is set up in parameter designing, below in relational expression
R21//R31 represents R21 and R31 resistances in parallel.
So after power supply normal boot-strap, main road output voltage is more than cell voltage, and the main road output band of power supply carries, at this moment
Current detecting amplifier or comparator control VT1 shut-offs, now main road output voltage meets following relational expression, less than cell voltage.
At this moment because main road voltage is less than cell voltage, main road output turns on again without load, VT1, and R3 participates in main road again
In the sampling network of output, main road output voltage is caused to rise, higher than band carries again after cell voltage.So begin to a weight
Multiple process, i.e. main road output voltage are constantly surrounding battery voltage ripple, until the switch S1 disconnections in Fig. 1, by battery
Depart from from the dc bus in system.Now because Power supply belt carries, VT1 shut-offs, main road output recovers normal voltage.
Realized using the scheme of the embodiment of the present invention in AC/DC power cut-off recovery processs, reserve battery and AC/DC electricity
Source is to the seamless switching of system power supply, and the mode than the control of existing oring circuits is more simple, and cost is also relatively lower, and
The efficiency of power supply is had no significant effect.
It the above is only the embodiment of the present invention, any formal limitation not done to the present invention, it is every
Any simple modification, equivalent variations, combination or the modification that technical spirit according to the present invention is made to embodiment of above, still
Belong to the protection domain of technical solution of the present invention.
Claims (10)
1. a kind of power up control circuit, it is characterised in that including sample circuit and control circuit；The sample circuit difference
It is connected with AC/DC power output ends and the control circuit input；The control circuit output end and AC/DC power control terminals
Connection；
The sample circuit is used in AC/DC power cut-off recovery processs, and the output to AC/DC power supplys samples；
The control circuit is used to judge that the output voltage of the AC/DC power supplys is more standby than what is currently powered according to the sampled result
With electric power output voltage it is low when, by the output voltage setting of the AC/DC power settings be more than the stand-by power supply export electricity
The target voltage values of pressure.
2. power up control circuit as claimed in claim 1, it is characterised in that the control circuit is additionally operable to adopt according to
When sample result judges that the output voltage of the AC/DC power supplys is higher than the stand-by power supply output voltage currently powered, by the AC/DC
The output voltage of power settings is normal output voltage value by target voltage values readjustment.
3. power up control circuit as claimed in claim 1 or 2, it is characterised in that the sample circuit includes main sampling
Circuit and auxiliary sample circuit；
The main sample circuit includes the first main partial pressure collection sub-circuit and the second main partial pressure collection sub-circuit of series connection, and described the
The main road output of one main partial pressure collection sub-circuit and the flyback transformer of AC/DC power supplys connects, second main partial pressure collection
Circuit ground；
The auxiliary partial pressure collection sub-circuit of first auxiliary partial pressure Acquisition Circuit and second of the auxiliary sample circuit including series connection, described first
Auxiliary main partial pressure Acquisition Circuit and the bypass output of the flyback transformer of AC/DC power supplys connect, the second auxiliary partial pressure collection son electricity
Road is grounded；
Connected between the second main partial pressure collection sub-circuit and the second auxiliary partial pressure collection sub-circuit by individual event turning circuit
Connect, when the second main partial pressure collection sub-circuit voltage is higher than the described second auxiliary partial pressure collection sub-circuit, the individual event electric conduction
Road turns on；The voltage of the second main partial pressure collection sub-circuit is the output voltage of the sample circuit output end；
The control circuit includes comparison circuit, two inputs of the comparison circuit respectively with sample circuit output end and ginseng
Voltage Vref connections are examined, by the output voltage of the sample circuit compared with the reference voltage Vref, less than described with reference to electricity
During pressure, judge that the output voltage of the AC/DC power supplys is lower than the stand-by power supply output voltage currently powered, to AC/DC electricity
Source control terminal sends booster tension control signal.
4. power up control circuit as claimed in claim 3, it is characterised in that the first main partial pressure collection sub-circuit
Resistance R1, the resistance R2 of the second main partial pressure collection sub-circuit, the resistance R4 of the second auxiliary partial pressure Acquisition Circuit and the reference electricity
Press VrefRelation it is as follows：
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The VbatFor the stand-by power supply output voltage；The VrefOutput voltage equal to AC/DC power supplys is multiplied byInstitute
It is resistance R2 and R4 resistance in parallel to state R2//R4.
5. power up control circuit as claimed in claim 1 or 2, it is characterised in that the sample circuit includes main sampling
Circuit and auxiliary sample circuit；
The main sample circuit includes the first main partial pressure collection sub-circuit and the second main partial pressure collection sub-circuit of series connection, and described the
The main road output of one main partial pressure collection sub-circuit and the power transformer of AC/DC power supplys connects, second main partial pressure collection
Circuit ground；The voltage of the second main partial pressure collection sub-circuit is the output voltage of the sample circuit output end；
The auxiliary sample circuit includes current collector, voltage allotment sub-circuit and switch control sub-circuit, the electric current and adopted
The upper load in series of main road output of storage and the power transformer of AC/DC power supplys, the voltage allotment sub-circuit and described second
Main partial pressure collection sub-circuit is in parallel, and the voltage dispensable circuit is provided with shut-off and switched；The input of the switch control sub-circuit
End is connected with current collector and switch reference voltage respectively, output end and the shut-off switch connection, by the current acquisition
Device and switch reference voltage ratio are compared with during less than switch reference voltage, by the shut-off switch closure；
The control circuit includes comparison circuit, two inputs of the comparison circuit respectively with sample circuit output end and ginseng
Voltage Vref connections are examined, by the output voltage of the sample circuit compared with the reference voltage Vref, less than described with reference to electricity
During pressure, judge that the output voltage of the AC/DC power supplys is lower than the stand-by power supply output voltage currently powered, to AC/DC electricity
Source control terminal sends booster tension control signal.
6. power up control circuit as claimed in claim 5, it is characterised in that the first main partial pressure collection sub-circuit
Resistance R11, the resistance R21 of the second main partial pressure collection sub-circuit, the resistance R31 of voltage allotment sub-circuit and the reference voltage
VrefRelation it is as follows：
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The VbatFor the stand-by power supply output voltage；The VrefOutput voltage equal to AC/DC power supplys is multiplied by
The R21//R31 is resistance R21 and R31 resistance in parallel.
7. power up control circuit as claimed in claim 1 or 2, it is characterised in that the stand-by power supply is battery.
8. a kind of power circuit, it is characterised in that including AC/DC power supplys, stand-by power supply and such as any one of claim 1-7 institutes
The power up control circuit stated；
The stand-by power supply is connected with the AC/DC power output ends, for being load supplying in AC/DC power cut-offs；
The power up control circuit is used in AC/DC power cut-off recovery processs, and the output to AC/DC power supplys is adopted
Sample, will when judging that the output voltage of the AC/DC power supplys is lower than the stand-by power supply output voltage currently powered according to sampled result
The output voltage setting of the AC/DC power settings is the target voltage values more than the stand-by power supply output voltage.
9. a kind of power up control method, including：
In AC/DC power cut-off recovery processs, the output to AC/DC power supplys samples；
When judging that the output voltage of the AC/DC power supplys is lower than the stand-by power supply output voltage currently powered according to sampled result,
It is the target voltage values more than the stand-by power supply output voltage by the output voltage setting of the AC/DC power settings.
10. power up control method as claimed in claim 9, it is characterised in that also include：
When judging that the output voltage of the AC/DC power supplys is higher than the stand-by power supply output voltage currently powered according to sampled result,
The output voltage readjustment of the AC/DC power settings is arranged to normal output voltage value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610465364.6A CN107546838B (en) | 2016-06-23 | 2016-06-23 | Power supply circuit, power supply recovery control circuit and method |
| PCT/CN2017/087902 WO2017219887A1 (en) | 2016-06-23 | 2017-06-12 | Power source circuit, and power source recovery control circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610465364.6A CN107546838B (en) | 2016-06-23 | 2016-06-23 | Power supply circuit, power supply recovery control circuit and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107546838A true CN107546838A (en) | 2018-01-05 |
| CN107546838B CN107546838B (en) | 2022-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610465364.6A Active CN107546838B (en) | 2016-06-23 | 2016-06-23 | Power supply circuit, power supply recovery control circuit and method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107546838B (en) |
| WO (1) | WO2017219887A1 (en) |
Cited By (2)
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| CN109450049A (en) * | 2018-12-28 | 2019-03-08 | 郑州云海信息技术有限公司 | A kind of power supply unit and method of supplying power to |
| CN110739736A (en) * | 2019-09-10 | 2020-01-31 | 宁波中车新能源科技有限公司 | stand-by power supply circuit of super capacitor gate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109586926A (en) * | 2019-01-16 | 2019-04-05 | 珠海格力电器股份有限公司 | Data transmission set and its control method |
| CN114327236B (en) * | 2021-12-13 | 2024-04-09 | 昌辉汽车电器（黄山）股份公司 | Judgment method for adding voltage correction factor when singlechip receives AD signal |
| CN115986880B (en) * | 2023-01-06 | 2024-05-10 | 铁塔能源有限公司 | Charging method and charging circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2017219887A1 (en) | 2017-12-28 |
| CN107546838B (en) | 2022-07-15 |
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