CN107492865B - A kind of alternating current power failure response circuit and electrical equipment - Google Patents
A kind of alternating current power failure response circuit and electrical equipment Download PDFInfo
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- CN107492865B CN107492865B CN201710718826.5A CN201710718826A CN107492865B CN 107492865 B CN107492865 B CN 107492865B CN 201710718826 A CN201710718826 A CN 201710718826A CN 107492865 B CN107492865 B CN 107492865B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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Abstract
The embodiment of the invention discloses a kind of AC dump response circuit and electrical equipments, wherein AC dump response circuit includes PFC control module, big electrolytic module, LLC control module, LLC transformer, power supply module and power down respond module.Power down respond module is connected with the function number outlet of PFC control module and LLC control module, PFC control module accesses AC power source, electroresponse module is pawned to change by the pulse signal of the function number outlet of PFC control module, when determining AC power source power down, control LLC control module stops working, and then controls control LLC transformer and stop working, and control power supply indicator extinguishing does not work, it realizes in the alternating current power failure that electrical equipment accesses, can stop working in time and accurate feedback is to user.
Description
Technical field
The present embodiments relate to electric variable detection technique field more particularly to a kind of alternating current power failure response circuits and electricity
Device equipment.
Background technique
AC-DC can be all used inside most household appliances on the market at present, the power supply of DC-DC framework falls in AC power source
When electric, it will usually stop the work of electrical equipment inside chip immediately, and power down is embodied with the extinguishing of peripheral hardware indicator light, but
It is that there is also some special electrical equipment electric power management mechanisms, makes it difficult to meet above-mentioned requirements.
Fig. 1 show a kind of structural schematic diagram of the used power management module of electrical equipment in the prior art, the power supply
Management module includes exchange electrical interface, current rectifying and wave filtering circuit, big electrolytic capacitor, control circuit, transformer and output rectification circuit.
When the electrical equipment is worked normally by exchange electrical interface input AC electric (Alternating Current, AC)
When, big electrolytic capacitor stores electric energy；When the alternating current power failure of input, the electric energy of big electrolytic capacitor release continues as control electricity
Road provides operating voltage, and control circuit is maintained to work on, and then controls transformer and work on, and big electrolytic capacitor is discharged
Electric energy conversion, by output rectification circuit output voltage, makes the chip of electrical equipment and power supply indicator work on, power supply refers to
Show that lamp worked on duration up to 48 seconds.To the alternating current that user causes electrical equipment to input, there are no the vacations of power down for this
As allowing user to be difficult to judge whether electrical equipment shuts down, influencing user to the usage experience of electrical equipment.
Summary of the invention
To solve Related Technical Issues, the embodiment of the present invention provides a kind of alternating current power failure response circuit and electrical equipment,
To realize in the alternating current power failure that electrical equipment accesses, it can stop working in time and accurate feedback is to user.
To achieve the above object, the embodiment of the present invention adopts the following technical scheme that
In a first aspect, the embodiment of the present invention provides a kind of alternating current power failure response circuit, including PFC control module, big electricity
Solving module, LLC control module, LLC transformer and power supply module, the circuit further includes power down respond module, wherein；
The PFC control module is connected, for accessing AC power source simultaneously respectively with the big electrolytic module and power supply module
PFC processing is carried out, is charged to the big electrolytic module, the function number outlet of the PFC control module is used for
Change exported pulse signal in the AC power source power down；
The power down respond module is connected with the function number outlet of the PFC control module and LLC control module respectively,
For confirming the AC power source power down in the pulse signal change of the function number outlet, and control the LLC control mould
Block stops working；
The LLC control module is connected with the LLC transformer and power supply module respectively, when the LLC control module is stopped
When only working, controls the LLC transformer and stop working；
The power supply module is connected with the LLC transformer, for mentioning for the PFC control module and LLC control module
For supply voltage；
The LLC transformer, is connected with power supply indicator, when the LLC transformer stops working, controls the power supply
Indicator light extinguishes.
Preferably, the PFC control module includes PFC control chip；
The function number outlet of the PFC control module is the driving pin that the PFC controls chip, in AC power source power down
When, the driving pin of the PFC control chip exports low level signal.
Preferably, the LLC control module includes LLC control chip；
The power down respond module is connected with the sampling induced voltage input pin of LLC control chip, is specifically used for
According to the low level signal of access, the sampling electricity on the sampling induced voltage input pin of the LLC control chip is dragged down
Pressure, when the sampled voltage is less than setting voltage, the LLC control chip stops working.
Preferably, the power down respond module includes resistance R21, resistance R22, resistance R23, diode D4, triode Q3
With capacitor C4；
The first end of the resistance R22 is connected with the driving pin of PDF control chip, second end and the diode
The anode of D4 is connected；The cathode of the diode D4 respectively with the first end of the capacitor C4, the first end of the resistance R23 with
And the base stage of the triode Q3 is connected；The collector of the triode Q3 respectively with the second end of the capacitor C4 and described
The second end of resistance R23 is connected, and is grounded, and the emitter of the triode Q3 is connected with the first end of the resistance R21；It is described
The second end of resistance R21 is connected with the sampling induced voltage input pin of LLC control chip.
Preferably, the resistance value of the resistance R21 is 0 Ω, and the resistance value of the resistance R22 is 330 Ω, the resistance R23's
Resistance value is 10M Ω, and the capacitance of the capacitor C4 is 680pF, the model MMBT4403LT1 of the triode Q3.
Preferably, the PFC control module further includes PFC control unit, and the PFC control unit includes inductor, institute
State the model TEA88182T/1J, working frequency 120KHZ of PFC control chip；
The driving pin of the PFC control unit and the PFC control chip is connected, by the inductor respectively with institute
The demagnetization detection pin for stating AC power source, power supply module and the PFC chip is connected, and is used for when the AC power source power down,
The PFC control chip is controlled by the inductor to stop working.
Preferably, the LLC control module further includes LLC control unit, the model of the LLC control chip
TEA88181T/1Y；
The LLC control unit drive with the big electrolytic module, LLC transformer and the LLC control chip respectively
Dynamic pin is connected, for controlling the LLC transformer and stopping working when LLC control chip stops working.
Preferably, the circuit further include:
Rectification filtering module accesses the AC power source, is connected with the PFC control module, for converting alternating current
At direct current；
PFC sampling module accesses PFC voltage, the defeated phase of sampling induced voltage input pin with LLC control chip
Even, for carrying out partial pressure sampling to the PFC voltage, the sampled voltage is provided to the sampling induced voltage input pin；
Rectification module is exported, is connected respectively with machine core and the LLC transformer, is used for, when the LLC transformer stops work
When making, stop to the machine core output voltage, so that the power supply indicator being connected with the machine core stops working.
Preferably, the rectification filtering module includes filter unit and rectification unit；
The filter unit accesses the AC power source, is connected with the rectification unit, for the alternating current to access into
Row filtering processing；
The rectification unit is connected with the filter unit and the PFC control module respectively, for after being filtered
Alternating current be converted into direct current.
Second aspect, the embodiment of the present invention also provide a kind of electrical equipment, including power supply, and the power supply includes such as aforementioned the
Alternating current power failure response circuit described in one side.
Technical solution bring provided in an embodiment of the present invention the utility model has the advantages that
The embodiment of the present invention provides a kind of alternating current power failure response circuit and electrical equipment, wherein alternating current power failure response
Circuit includes PFC control module, big electrolytic module, LLC control module, LLC transformer, power supply module and power down respond module,
Power down respond module is connected with the function number outlet of PFC control module and LLC control module, and PFC control module accesses alternating current
Source pawns electroresponse module and is changed by the pulse signal of the function number outlet of PFC control module, determines AC power source power down
When, control LLC control module stops working, and then controls control LLC transformer and stop working, and control power supply indicator extinguishes not
Work is realized in the alternating current power failure that electrical equipment accesses, and can stop working in time and accurate feedback is to user.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the used power management module of electrical equipment in the prior art；
Fig. 2 is a kind of structural schematic diagram of alternating current power failure response circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another alternating current power failure response circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of partial circuit diagram of alternating current power failure response circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of partial circuit diagram of alternating current power failure response circuit provided in an embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of electrical equipment provided in an embodiment of the present invention.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will the technical scheme of the embodiment of the invention will be described in further detail in conjunction with attached drawing, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Fig. 2 is please referred to Fig. 5, wherein the hexagon in Fig. 4 and Fig. 5 indicates connection site, the identical hexagon table of title
Show that same connection site, Fig. 4 and the circuit in Fig. 5 are connected by connecting site GATEPFC.
Be to realize in the alternating current power failure that electrical equipment access, can stop working in time simultaneously accurate feedback to user,
In one embodiment of the invention, a kind of alternating current power failure response circuit, including PFC (Power Factor are provided
Correction, PFC) control module 3, big electrolytic module 4, LLC control module 5, LLC transformer (T1) 7, confession
Electric module 8 and power down respond module 6, wherein；
PFC control module 3 is connected with big electrolytic module 4 and power supply module 8 respectively, for accessing AC power source 1 and carrying out
PFC processing, charges to big electrolytic module 4, and the function number outlet of PFC control module 3 is used in AC power source
Change exported pulse signal when 1 power down；
Power down respond module 6 is connected with the function number outlet of PFC control module 3 and LLC control module 5 respectively, is used for
1 power down of AC power source is confirmed when the pulse signal of function number outlet changes, and is controlled LLC control module 5 and stopped working；
LLC control module 5 is connected with LLC transformer 7 and power supply module 8 respectively, when LLC control module 5 stops working
When, control LLC transformer 7 stops working；
Power supply module 8 is connected with LLC transformer 7, for providing power supply electricity for PFC control module 3 and LLC control module 5
Pressure；
LLC transformer 7, is connected with power supply indicator, and when LLC transformer 7 stops working, control power supply indicator is put out
It goes out.
In the present embodiment, 5 phase of function number outlet and LLC control module of power down respond module 6 and PFC control module 3
Even, PFC control module 3 accesses AC power source 1, pawns electroresponse module 6 and passes through the arteries and veins of the function number outlet of PFC control module 3
Signal change is rushed, when determining 1 power down of AC power source, control LLC control module 5 stops working, and then controls control LLC transformer
7 stop working, and control power supply indicator extinguishing does not work, and realizes in the alternating current power failure that electrical equipment accesses, can be timely
It stops working and accurate feedback is to user.
On the basis of the above embodiments, PFC control module 3 includes that PFC controls chip (U5) 32；
The function number outlet of PFC control module 3 is the driving pin 1 that PFC controls chip 32, in 1 power down of AC power source,
The driving pin 1 that PFC controls chip 32 exports low level signal.
In the present embodiment, the pulse signal that the driving pin 1 that PFC controls chip 32 exports is high level signal and low electricity
Ordinary mail number, before 1 power down of AC power source, PFC controls 1 output pulse signal of driving pin of chip 32, when 1 power down of AC power source
When, the driving pin 1 of PFC control chip 32 only exports low level signal, and PFC controls chip 32 and passes through the driving output letter of pin 1
Number variation embody this state change of 1 power down of AC power source.The driving pin 1 that PFC controls chip 32 exports low level letter
Number it is transferred to power down respond module 6.
On the basis of the above embodiments, LLC control module 5 includes that LLC controls chip (U6) 52；
Power down respond module 6 is connected with the sampling induced voltage input pin 16 of LLC control chip 52, is specifically used for basis
The low level signal of access drags down the sampled voltage on the sampling induced voltage input pin 16 of LLC control chip 52, works as sampling
When voltage is less than setting voltage, LLC control chip 52 stops working.
In the present embodiment, when 1 power down of AC power source, even if big electrolytic module 4 discharges, since power down respond module 6 connects
Enter the low level signal that the driving pin 1 of PFC control chip 32 exports, the sampling induction of LLC control chip 52 can be dragged down rapidly
Sampled voltage on voltage input pin 16, when dragging down sampled voltage lower than setting voltage (protection voltage), LLC controls chip
52 will stop working, and then hole LLC transformer 7 stops working, and realize the quick response to 1 power down of AC power source.
It should be noted that as in the prior art, if lacking power down respond module 6, when 1 power down of AC power source, greatly
Electrolytic module 4 starts to discharge, and maintains the sampled voltage on the sampling induced voltage input pin 16 of LLC control chip 52 to be higher than and protects
Voltage is protected, LLC control chip 52 will work on, and continue to that big 4 discharge off of electrolytic module just stops working namely LLC is controlled
Coremaking piece 52 need to be delayed could respond 1 power down of AC power source for a period of time.
On the basis of the above embodiments, power down respond module 6 includes resistance R21, resistance R22, resistance R23, diode
D4, triode Q3 and capacitor C4；
The first end of resistance R22 is connected with the driving pin 1 of PDF control chip, the positive phase of second end and diode D4
Even；The cathode of diode D4 is connected with the base stage B of the first end of capacitor C4, the first end of resistance R23 and triode Q3 respectively；
The collector C of triode Q3 is connected with the second end of the second end of capacitor C4 and resistance R23 respectively, and is grounded, triode Q3
Emitter E be connected with the first end of resistance R21；The second end of resistance R21 and the sampling induced voltage of LLC control chip 52 are defeated
Enter pin 16 to be connected.
Further, the resistance value of resistance R21 is 0 Ω, and the resistance value of resistance R22 is 330 Ω, and the resistance value of resistance R23 is 10M
The capacitance of Ω, capacitor C4 are 680pF, the model MMBT4403LT1 of triode Q3.
Further, PFC control module 3 further includes PFC control unit 31, and PFC control unit 31 includes inductor L1D1,
The model TEA88182T/1J, working frequency 120KHZ of PFC control chip 32；
The driving pin 1 of PFC control unit 31 and PFC control chip 32 is connected, by inductor L1D1 respectively with exchange
The demagnetization detection pin 8 of power supply 1, power supply module 8 and PFC chip is connected, for passing through inductor when 1 power down of AC power source
L1D1 control PFC control chip 32 stops working；
Wherein, PFC control unit 31 further includes capacitor CX1, triode Q4 and resistance RS1, and the capacitance of capacitor CX1 is 1uF,
The resistance value of resistance RS1 is 10 Ω；The pin 1 of inductor L1D1 is grounded, and the demagnetization of pin 3 and PFC control chip 32 detects pin 8
It is connected, pin 4 is connected with the first end of capacitor CX1, and pin 6 is connected with the pin 2 of big electrolytic module 4 and triode Q4 respectively；
Capacitor CX1 accesses AC power source 1, second end ground connection；The pin 1 of triode Q4 controls chip 32 by resistance RS1 and PFC
Pin 1 is driven to be connected.
Further, LLC control module 5 further includes LLC control unit 51, and LLC controls the model of chip 52
TEA88181T/1Y；
LLC control unit 51 controls the driving pin 6 of chip 52 with big electrolytic module 4, LLC transformer 7 and LLC respectively
It is connected with 9, for when LLC control chip 52 stops working, control LLC transformer 7 to stop working；
Wherein, LLC control unit 51 includes resistance RS2, resistance RS3, triode Q7, triode Q8 and capacitor C24, resistance
The resistance value of RS2 and resistance RS3 are 10 Ω, and the capacitance of capacitor C24 is 470pF；The pin 1 of triode Q7 by resistance RS2 with
The driving pin 6 that LLC controls chip 52 is connected, and pin 2 controls the pin 11 of chip 52 and drawing for LLC transformer 7 with LLC respectively
Foot 6 is connected, and pin 3 is connected by capacitor C24 with the pin 5 of LLC transformer 7, and is grounded；The pin 1 of triode Q8 passes through electricity
Resistance RS3 is connected with the driving pin 9 of LLC control chip 52, and pin 2 is connected with big electrolytic module 4, pin 3 and triode Q7's
Pin 2 is connected.
In addition, the capacitance that big electrolytic module 4 includes capacitor CE1 and capacitor CE2, capacitor CE1 and capacitor CE2 is 88uF,
Capacitor CE1 and the first end of capacitor CE2 parallel connection ground connection, second end access PFC voltage, and respectively with the pin 2 of triode Q4 and
The pin 2 of triode Q8 is connected；AC power source 1 when powering on big electrolytic module 4 charge, when 1 power down of AC power source big electrolytic module 4
Electric discharge.Power supply module 8 includes capacitor C13, diode ZD5, diode ZD4, capacitor CE14, diode D8 and diode D9, electricity
Holding the capacitance of C13 for the pressure stabilizing value of 100nF, diode ZD5 and diode ZD4 is 27V, and the capacitance of capacitor CE14 is 470uF,
The model of diode D8 and diode D9 are BA158, and capacitor C13, diode ZD5, diode ZD4 and capacitor CE14 are successively simultaneously
Connection, first end in parallel are connected with the energization pins 1 of the energization pins 4 of PFC control chip 32 and LLC control chip 52 respectively,
Second end in parallel is connected with the cathode of the cathode of diode D8 and diode D9 respectively, the anode and diode D9 of diode D8
Anode be connected, and be connected with the pin of LLC transformer 72 and pin 3；Power supply module 8 controls the power supply of chip 32 by PFC
The energization pins 1 of pin 4 and LLC control chip 52, respectively PFC controls chip 32 and LLC control chip 52 provides power supply electricity
Press VCC.
Further, the circuit of the present embodiment further include:
Rectification filtering module 2 accesses AC power source 1, is connected with PFC control module 3, for converting alternating current to direct current
Electricity；
PFC sampling module 9 accesses PFC voltage, defeated 16 phase of sampling induced voltage input pin with LLC control chip 52
Even, for carrying out partial pressure sampling to PFC voltage, sampled voltage is provided to sampling induced voltage input pin 16；Wherein, PFC is adopted
Egf block 9 include resistance R24, resistance R25, resistance R26, resistance R27, resistance R28 and resistance R29, resistance R24, resistance R25,
Resistance value with resistance R26 is that the resistance value of 4.7M Ω, resistance R27 and resistance R28 are 2.2M Ω, and the resistance value of resistance R29 is
120K Ω, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28 and resistance R29 are sequentially connected in series, one end of resistance R24
Access PFC voltage, one end ground connection of resistance R29,16 phase of sampling induced voltage input pin of the other end and LLC control chip 52
Even.
Rectification module 10 is exported, is connected respectively with machine core and LLC transformer 7, for when LLC transformer 7 stops working,
Stop to machine core output voltage, so that the power supply indicator being connected with machine core stops working.Wherein, output rectification module 10 with
Pin 7, pin 8, pin 9, pin 10, the pin 11 of LLC transformer 7 are connected with pin 12.
Further, rectification filtering module 2 includes filter unit and rectification unit；
Filter unit accesses AC power source 1, is connected with rectification unit, for being filtered to the alternating current of access；
Rectification unit is connected with filter unit and PFC control module 3 respectively, turns for the alternating current after being filtered
Change direct current into；Wherein, rectification unit includes rectifier bridge BD1,4 phase of pin of the pin 1 and inductor L1D1 of rectifier bridge BD1
Even, pin 2 is connected with the pin 2 of 1 socket LZ of AC power source, and pin 3 is connected with the pin 1 of 1 socket LZ of AC power source, pin 4
It is connected with the second end of capacitor CX1.
In addition, powered on when 1 socket LZ of AC power source connects plug CN1 for circuit, when pulling up plug CN1, AC power source 1
Power down.
In the present embodiment, for the operating voltage of LLC control chip 52 between 13V~27V, operating voltage range is wider,
It is 22V that operating voltage is arranged when normal work, and the operating voltage of sampling induced voltage input pin 16 is 2.5V, if the pin
Voltage be pulled low, and lower than protection voltage (1.6V) when, LLC control chip 52 stop working.
When 1 power down of AC power source, inductor L1D1 will not have voltage and current output, and PFC control chip 32 passes through demagnetization
When detection pin 8 detects that the voltage of inductor L1D1 does not change, even if due to big electrolytic capacitor CE1 and CE2, and supply
The capacitor CE14 continuous discharge of electric module 8 also leads to PFC control so that the supply voltage VCC of PFC control chip 32 is normal
Chip 32 stops working, and the driving pin 1 that PFC controls chip 32 exports low level signal, the base stage B of PNP type triode Q3
It is low level, and emitter E is still within the high level higher than 1.6V at this time, triode Q3 is connected in this, to draw rapidly
Low A point voltage, namely drag down the voltage of the sampling induced voltage input pin 16 of LLC control chip 52.When sampling induced voltage
When the voltage of input pin 16 is lower than 1.6V, LLC control chip 52 stops working, and LLC transformer 7 can not be driven to work on,
The primary side of LLC transformer 7, which has no ability to continue the energy that big electrolytic module 4 discharges is converted to 12V voltage, is transmitted to secondary side for machine
Core uses, and power supply indicator extinguishes immediately, realizes the quick response to 1 power down of AC power source, and feed back by power supply indicator
To user.
It should be noted that the supply voltage VCC of PFC control chip 32 reaches 19.2V when AC power source 1 re-powers
When, the voltage of the sampling induced voltage input pin 16 of LLC control chip 52 starts to start, at this point, PFC voltage does not become
To change, when the voltage of pin 16 is greater than 1.6V, that is, has been more than the under-voltage protection point of PFC sample circuit, PFC voltage is begun to ramp up,
400V is risen to by 320V.In the meantime, the voltage for sampling induced voltage input pin 16 continues to rise, when sampling induced voltage
PFC start completion when the voltage of input pin 16 rises to 2.3V samples induced voltage input pin 16 when final steady operation
Voltage be 2.5V.When PFC is started successfully, PFC controls the 1 output driving pulse signal of driving pin of chip 32, driving voltage
For 12V, working frequency 120KHZ, corresponding cycle time is 0.0000083S.
When the driving pin 1 of PFC control chip 32 exports high level signal, the voltage of the base stage B of triode Q3 is
12V is higher than the voltage (2.5V) of emitter E, so Q3 is in off state, does not influence PFC control chip 32 and LLC control
Chip 52 works normally；When the driving pin 1 of PFC control chip 32 exports low level signal, due in power down respond module 6
The presence of resistance R23, so that capacitor C4 electric discharge is very slow, it can be with by the time parameter of resistance R23 and capacitor C4 the RC circuit formed
The discharge time for calculating capacitor C4 is about 0.0056S.And the period of the driving 1 output driving pulse of pin of PFC control chip 32
Time is 0.0000083S, to be far smaller than the discharge time of capacitor C4, thus it is possible to guarantee to control the drive of chip 32 in PFC
When dynamic pin 1 exports low level, triode Q3 is still within off state, and the capacitance of capacitor C4 is 680pF, to driving wave
The influence that shape generates also can be ignored；Therefore, when 1 not power down of AC power source, no matter PFC control chip 32 exports high level
Or output low level, triode Q3 will not influence PFC control chip 32 all in off state, i.e. power down respond module 6
Normal operating conditions, nor affect on LLC control chip 52 and LLC transformer 7 normal operating conditions.
To sum up, by power down respond module 6, not only will not power supply stable operation, but also efficiently solve AC power source 1 and fall
After electricity, electrical equipment is responded not in time, cannot be stopped working in time and the technical issues of to user's accurate feedback.
Referring to FIG. 6, it is a kind of schematic diagram of electrical equipment provided in an embodiment of the present invention.
A kind of electrical equipment, including power supply, power supply include the response electricity of alternating current power failure provided by any of the above-described embodiment
Road.
Preferably, which is television set.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (7)
1. a kind of alternating current power failure response circuit, including PFC control module, big electrolytic module, LLC control module, LLC transformer
And power supply module, which is characterized in that the circuit further includes power down respond module, wherein；
The PFC control module is connected with the big electrolytic module and power supply module respectively, for accessing AC power source and carrying out
PFC processing, charges to the big electrolytic module, and the function number outlet of the PFC control module is used in institute
Change exported pulse signal when stating AC power source power down；
The power down respond module is connected with the function number outlet of the PFC control module and LLC control module respectively, is used for
The AC power source power down is confirmed when the pulse signal of the function number outlet changes, and is controlled the LLC control module and stopped
Only work；
The LLC control module is connected with the LLC transformer and power supply module respectively, the LLC control module and described big
Electrolytic module is connected, and when the LLC control module stops working, controls the LLC transformer and stops working；
The power supply module is connected with the LLC transformer, for providing confession for the PFC control module and LLC control module
Piezoelectric voltage；
The LLC transformer, is connected with power supply indicator, when the LLC transformer stops working, controls the power supply instruction
Lamp extinguishes；
Wherein, the PFC control module includes PFC control chip；
The function number outlet of the PFC control module is the driving pin that the PFC controls chip, in AC power source power down,
The driving pin of the PFC control chip exports low level signal；
The LLC control module includes LLC control chip；
The power down respond module is connected with the sampling induced voltage input pin of LLC control chip, for according to access
The low level signal, the sampled voltage on the sampling induced voltage input pin of LLC control chip is dragged down, when described
When sampled voltage is less than setting voltage, the LLC control chip stops working；
The power down respond module includes resistance R21, resistance R22, resistance R23, diode D4, triode Q3 and capacitor C4；
The first end of the resistance R22 is connected with the driving pin of PFC control chip, and second end is with the diode D4's
Anode is connected；The cathode of the diode D4 respectively with the first end of the capacitor C4, the first end of the resistance R23 and institute
The base stage for stating triode Q3 is connected；The collector of the triode Q3 respectively with the second end of the capacitor C4 and the resistance
The second end of R23 is connected, and is grounded, and the emitter of the triode Q3 is connected with the first end of the resistance R21；The resistance
The second end of R21 is connected with the sampling induced voltage input pin of LLC control chip.
2. circuit as described in claim 1, which is characterized in that the resistance value of the resistance R21 is 0 Ω, the resistance of the resistance R22
Value is 330 Ω, and the resistance value of the resistance R23 is 10M Ω, and the capacitance of the capacitor C4 is 680pF, the model of the triode Q3
For MMBT4403LT1.
3. circuit as described in claim 1, which is characterized in that the PFC control module further includes PFC control unit, described
PFC control unit includes inductor, the model TEA88182T/1J, working frequency 120KHZ of the PFC control chip；
The driving pin of the PFC control unit and the PFC control chip is connected, by the inductor respectively with the friendship
The demagnetization detection pin in galvanic electricity source, power supply module and PFC control chip is connected, and is used for when the AC power source power down,
The PFC control chip is controlled by the inductor to stop working.
4. circuit as claimed in claim 3, which is characterized in that the LLC control module further includes LLC control unit, described
The model TEA88181T/1Y of LLC control chip；
Driving of the LLC control unit respectively with the big electrolytic module, LLC transformer and the LLC control chip is drawn
Foot is connected, for controlling the LLC transformer and stopping working when LLC control chip stops working.
5. circuit as described in claim 1, which is characterized in that the circuit further include:
Rectification filtering module accesses the AC power source, is connected with the PFC control module, straight for converting alternating current to
Galvanic electricity；
PFC sampling module accesses PFC voltage, and the sampling induced voltage input pin for controlling chip with the LLC is defeated to be connected, and uses
In carrying out partial pressure sampling to the PFC voltage, the sampled voltage is provided to the sampling induced voltage input pin；
Rectification module is exported, is connected respectively with machine core and the LLC transformer, for when the LLC transformer stops working,
Stop to the machine core output voltage, so that the power supply indicator being connected with the machine core stops working.
6. circuit as claimed in claim 5, which is characterized in that the rectification filtering module includes that filter unit and rectification are single
Member；
The filter unit accesses the AC power source, is connected with the rectification unit, for filtering to the alternating current of access
Wave processing；
The rectification unit is connected with the filter unit and the PFC control module respectively, for the friendship after being filtered
Galvanic electricity is converted into direct current.
7. a kind of electrical equipment, including power supply, which is characterized in that the power supply includes as described in any one of claims 1 to 6
Alternating current power failure response circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710718826.5A CN107492865B (en) | 2017-08-21 | 2017-08-21 | A kind of alternating current power failure response circuit and electrical equipment |
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| CN201710718826.5A CN107492865B (en) | 2017-08-21 | 2017-08-21 | A kind of alternating current power failure response circuit and electrical equipment |
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| CN107492865B true CN107492865B (en) | 2019-11-26 |
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| CN201710718826.5A Active CN107492865B (en) | 2017-08-21 | 2017-08-21 | A kind of alternating current power failure response circuit and electrical equipment |
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| CN113448419B (en) * | 2021-05-22 | 2023-02-28 | 山东英信计算机技术有限公司 | System for prolonging power failure of server and server |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200962514Y (en) * | 2006-10-25 | 2007-10-17 | 深圳桑达国际电子器件有限公司 | Electricity drop detection device |
| CN202652375U (en) * | 2012-05-11 | 2013-01-02 | 深圳市瀚强科技有限公司 | Television power supply system with simple power fail safeguard |
| CN102739061B (en) * | 2012-06-25 | 2015-07-01 | 青岛海信电器股份有限公司 | Power supply method, power supply circuit and electronic equipment |
| CN106100374A (en) * | 2016-07-13 | 2016-11-09 | 深圳创维－Rgb电子有限公司 | Power supply and electrical equipment |
| CN206321756U (en) * | 2016-12-14 | 2017-07-11 | 广州视源电子科技股份有限公司 | Power failure detection circuit and switching power supply circuit |
| CN206353706U (en) * | 2016-12-20 | 2017-07-25 | 深圳创维－Rgb电子有限公司 | A kind of electric equipment and its power-down protection circuit |
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