CN107994763A - A kind of Switching Power Supply and its control circuit, the activation system of controller - Google Patents
A kind of Switching Power Supply and its control circuit, the activation system of controller Download PDFInfo
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- CN107994763A CN107994763A CN201810020171.9A CN201810020171A CN107994763A CN 107994763 A CN107994763 A CN 107994763A CN 201810020171 A CN201810020171 A CN 201810020171A CN 107994763 A CN107994763 A CN 107994763A
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- 230000004913 activation Effects 0.000 title claims abstract description 25
- 238000007600 charging Methods 0.000 claims abstract description 134
- 239000003990 capacitor Substances 0.000 claims abstract description 64
- 230000005611 electricity Effects 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 abstract description 16
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
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- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
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- 230000010354 integration Effects 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of Switching Power Supply and its control circuit, the activation system of controller, wherein activation system includes starting module, charging current control module, locking control module, dynamic charge control module and failure protection module.Starting module takes electricity from externally fed end, when the voltage of itself reaches the first predeterminated voltage, opens charging current control module；And then charging current is exported by charging current control module and is charged to charging capacitor；When the voltage of charging capacitor is increased to the second predeterminated voltage, locking control module starts controller, and it is fast to start speed.For dynamic charge control module when the voltage of charging capacitor reaches three predeterminated voltages, charge closing current control module is to reduce charging capacitor voltage；Start charging current control module when the voltage of charging capacitor is reduced to four predeterminated voltages；Charge so as to fulfill the dynamic of charging capacitor, it is not necessary to which auxiliary winding is powered, and stand-by power consumption is low, and activation system peripheral circuit is simple in structure, high financial profit.
Description
Technical field
The present invention relates to field of switch power, and in particular to a kind of startup of Switching Power Supply and its control circuit, controller
System.
Background technology
Traditional switch power supply needs start-up circuit to provide starting voltage to the power supply of controller when system opens machine, until
Controller can work normally, and controller can be powered by auxiliary winding at this time.As shown in Figure 1, it is AC-DC of the prior art
The circuit structure diagram of Switching Power Supply.When power-supply system starts, start voltage HV by starting the VDD of resistance Rs devices 2 in order to control
Foot external capacitor Cin provides charging path.When the voltage of capacitance Cin reaches predeterminated voltage, controller 2 is started to work, this time control
Device 2 processed is powered by auxiliary winding LA.
Traditional external startup resistance mode, charging current depend on starting the size of resistance Rs, this electric current decision systems
The startup time；And start-up circuit 1 cannot turn off after controller 2 starts, therefore will be produced on resistance Rs is started
Certain stand-by power consumption, this power consumption also depend on the size for starting resistance Rs.If start the excessive system start-up time of resistance Rs values
Long, 1 stand-by power consumption of start-up circuit is less than normal；Otherwise the startup too small system start-up time of resistance Rs values is short, and start-up circuit is treated
Machine power consumption is bigger than normal.It can thus be appreciated that starting the value of resistance Rs will trade off between system start-up time and stand-by power consumption, it is difficult to together
When meet shorter startup time and less stand-by power consumption.
This framework using external startup resistance auxiliary winding power supply, system standby power consumption is big, starts overlong time, is
Circuit structure of uniting is complicated, and integrated level is low, and PCB circuit board area is big, and manufacturing cost is high.
Therefore, the prior art has much room for improvement and improves.
The content of the invention
The application provides a kind of Switching Power Supply and its control circuit, the activation system of controller, completes to start in controller
Afterwards, it is not necessary to which auxiliary winding is powered, to reduce stand-by power consumption.
According to the first aspect of the invention, the present invention provides a kind of activation system of switch power controller, including：
The starting module at externally fed end is connected, for when the voltage of itself reaches the first predeterminated voltage, opening charging
Current control module；
Charging current control module, for producing the charging current to charging capacitor charging；
Control module is locked, for when the voltage of charging capacitor is increased to the second predeterminated voltage, starting controller；
Dynamic charge control module, for detecting the voltage of charging capacitor, it is default to reach the 3rd in the voltage of charging capacitor
During voltage, charge closing current control module, to reduce the voltage of charging capacitor；It is pre- that the 4th is reduced in the voltage of charging capacitor
If during voltage, start charging current control module；3rd predeterminated voltage is more than the 4th predeterminated voltage；
Failure protection module, for receiving fault-signal, when receiving fault-signal, charge closing current control mould
Block, to reduce the voltage of charging capacitor.
The activation system of the switch power controller, wherein, the locking control module is additionally operable in charging capacitor
Voltage when being reduced to five predeterminated voltages, closing control device；5th predeterminated voltage is less than the second predeterminated voltage, the 4th default electricity
Pressure.
The activation system of the switch power controller, wherein, the starting module includes first resistor and the one or two
Pole pipe；One end connection externally fed end of the first resistor；The other end of the first resistor is the output terminal of starting module,
Connect the control terminal of charging current control module and the anode of the first diode, the plus earth of the first diode.
The activation system of the switch power controller, wherein, the charging current control module includes first crystal
Pipe, second resistance and the second diode；The control terminal of the control extremely charging current control module of the first transistor, connection
The anode of first diode；First pole of the first transistor connects the cathode of the second diode by second resistance, described
The second pole connection externally fed end of the first transistor；The anode of second diode is the output terminal of charging current control module,
Connect one end of charging capacitor and the input terminal of locking control module；The other end ground connection of the charging capacitor；The first transistor
High level turns on.
The activation system of the switch power controller, wherein, the locking control module is under-voltage locking module.
The activation system of the switch power controller, wherein, the dynamic charge control module include 3rd resistor,
4th resistance, the 5th resistance, first comparator, the second comparator, second transistor and charging control logic unit；Described 3rd
One end of one end connection charging capacitor of resistance, the normal phase input end and the 4th of the other end connection first comparator of 3rd resistor
One end of resistance；The other end of 4th resistance connects the normal phase input end of the second comparator and one end of the 5th resistance；5th electricity
The other end ground connection of resistance；The inverting input of the inverting input of first comparator and the second comparator receives reference voltage；
The output terminal of the output terminal of first comparator and the second comparator is all connected with charging control logic unit；The first of second transistor
Pole is grounded, and the second pole of second transistor connects the anode of the first diode；The control pole connection charge control of second transistor
The output terminal of logic unit；Charging control logic unit is used to, when receiving the high level signal of the second comparator output, beat
Open second transistor；When receiving the high level signal of first comparator output, second transistor is closed.
According to the second aspect of the invention, the present invention provides a kind of control circuit of Switching Power Supply, including controller and such as
The upper activation system；The power end connection locking control module of the controller.
The control circuit of the Switching Power Supply, wherein, further include charging capacitor, power transistor and sampling resistor；Institute
The first pole for stating power transistor is grounded by sampling resistor, the output of the control pole connection controller of the power transistor
End, the main circuit of the first pole connecting valve power supply of the power transistor.
According to the third aspect of the invention we, the present invention provides a kind of Switching Power Supply, including control circuit as described above and
Main circuit；The main circuit includes：
Rectification module, for being direct current by power grid AC rectification；
Transformer, for changing the voltage of the direct current.
The Switching Power Supply, wherein, the Switching Power Supply is AC-DC Switching Power Supplies.
Beneficial effects of the present invention：Starting module takes electricity from externally fed end, reaches the first default electricity in the voltage of itself
During pressure, charging current control module is opened；And then charging current is exported by charging current control module and is charged to charging capacitor；
When the voltage of charging capacitor is increased to the second predeterminated voltage, locking control module starts controller, it is seen that it is fast to start speed.Dynamically
Charge control module detects the voltage of charging capacitor, when the voltage of charging capacitor reaches three predeterminated voltages, charge closing electricity
Flow control module, to reduce the voltage of charging capacitor；When the voltage of charging capacitor is reduced to four predeterminated voltages, start charging
Current control module；Charge so as to fulfill the dynamic of charging capacitor, it is not necessary to which auxiliary winding is powered, and stand-by power consumption is low, starts system
Peripheral circuit of uniting is simple in structure, has higher technical economic benefit.By failure protection module, the peace of controller can be improved
Entirely.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing Switching Power Supply；
Fig. 2 is the circuit diagram of one embodiment of Switching Power Supply provided by the invention；
Fig. 3 is the structure diagram of the activation system of controller in one embodiment of Switching Power Supply provided by the invention；
Fig. 4 is the circuit diagram of the activation system of controller in one embodiment of Switching Power Supply provided by the invention；
Fig. 5 is the circuit diagram of control chip in another embodiment of Switching Power Supply provided by the invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the section Example of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, the every other implementation that those skilled in the art are obtained without creative efforts
Example, belongs to the scope of protection of the invention.
The present invention provides a kind of Switching Power Supply, including main circuit and control circuit.The main circuit filtering AC network is deposited
Clutter and the clutter that hinders Switching Power Supply to produce feed back to power grid, be smoother straight by the direct rectification of power grid AC power
Galvanic electricity, and transformation is carried out to the direct current to supply load.On the one hand the control circuit is sampled from output terminal, with setting value
It is compared, then removes control inverter, changes its pulsewidth or arteries and veins frequency, stablize output, on the other hand, according to the number of sampling
According to, there is provided control circuit carries out various safeguard measures to power supply.
Embodiment one：
In the present embodiment, the Switching Power Supply is AC-DC Switching Power Supplies, as shown in Fig. 2, the main circuit includes filtering mould
Block 60, rectification module 70 and transformer 80.The input terminal connection alternating current (alternating current) of filter module 60, the output of filter module 60
End connects the primary side winding Lp of transformer 80, the secondary windings Ls connections load of transformer 80 by rectification module 70.
The rectification module 70, for being direct current by power grid AC rectification.It is rectifier bridge in the present embodiment.
The transformer 80, for changing the voltage of the direct current.
Also referring to Fig. 3 and Fig. 4, the control circuit includes charging capacitor Cin, power transistor M0, sampling resistor
Rcs, controller and its activation system (circuit) 3.The first pole of the power transistor M0 is grounded by sampling resistor Rcs, institute
State the first pole connection transformation of the output terminal GATE, the power transistor M0 of the control pole connection controller of power transistor M0
One end of device primary side winding Lp.
On the one hand the controller is sampled from output terminal, compared with setting value, using technologies such as PWM, PFM to output
Pulse is adjusted, and makes output voltage stabilization, on the other hand, according to the data of sampling, there is provided control circuit carries out power supply each
Kind of safeguard measure, in the present embodiment, the controller of AC-DC Switching Power Supplies is conventional controller, is not repeated.
The activation system 3 is used to start controller, it includes starting module 10, charging current control module 20, locking
Control module 30, dynamic charge control module 40 and failure protection module 50.The input terminal and charging electricity of the starting module 10
The input terminal of flow control module 20 is all connected with externally fed end (one end of primary side winding Lp), the output terminal of the starting module 10
Connect the control terminal of charging current control module 20, the output terminal connection charging capacitor Cin of the charging current control module 20
One end, lock control module 30 input terminal and dynamic charge control module 40 first input end；Charging capacitor Cin's is another
One end is grounded；The charging capacitor Cin is when M0 is closed by commercial power charged, and controller is by mains-supplied at this time；Opened in M0
When, self-discharge is powered to controller, and charging capacitor Cin is not by commercial power charged at this time.It is described to lock the defeated of control module 30
Second input terminal of outlet connection dynamic charge control module 40；Failure protection module 50 connects dynamic charge control module 40
3rd input terminal；The output terminal of failure protection module 50 connects charging current control with the output terminal of dynamic charge control module 40
The control terminal of module 20.
The starting module (circuit) 10, for controlling the break-make of charging current control module 20；Specifically, for certainly
When the voltage (voltage of node Clamp) of body reaches and (be greater than or equal to) the first predeterminated voltage, charging current control module is opened
20；When the voltage (voltage of node Clamp) of itself is less than the first predeterminated voltage, charge closing current control module 20.This
In embodiment, the starting module 10 includes first resistor R1 and at least one first diode D1；The first resistor R1's
One end connection externally fed end；The other end of the first resistor R1 is the output terminal of starting module 10, connects charging current control
The anode of the control terminal of molding block 20 and the first diode D1, the plus earth of the first diode D1.The first diode D1
Preferably Zener diode (clamper tube), can use multiple Zener diode D1 to connect, particular number is set according to clamp voltage
Depending on meter needs.
The charging current control module (circuit) 20, for producing the charging current to charging capacitor Cin chargings.It is described
Charging current control module 20 includes the first transistor M1, second resistance R2 and the second diode D2；The first transistor M1
Control extremely charging current control module 20 control terminal, turned on for high level, connect the anode of the first diode D1；It is described
The first pole of the first transistor M1 is by the cathode of second resistance R2 the second diodes of connection D2, and the of the first transistor M1
Two poles connection externally fed end；The anode of second diode D2 is the output terminal of charging current control module 20, and connection charging is electric
Hold one end of Cin and the input terminal of locking control module 30.The switching tube that the first transistor M1 charges in order to control, is preferably
LDMOS (lateral diffusion metal oxide semiconductor), second resistance R2 are used for current limliting, and the second diode D2 then falls for anti-electric current
Fill.First predeterminated voltage is the cut-in voltage of the first transistor M1.In the present embodiment, the first transistor M1 is N ditches
Road metal-oxide-semiconductor, it controls the grid of extremely N-channel MOS pipe, the source electrode of the first extremely N-channel MOS pipe, the second extremely N-channel MOS
The drain electrode of pipe.
The locking control module 30, for when the voltage of charging capacitor Cin is increased to the second predeterminated voltage, starting control
Device processed；When the voltage of charging capacitor Cin is less than five predeterminated voltages, closing control device, makes control circuit be in guard mode.
Second predeterminated voltage is the minimum operating voltage that controller starts, and the 5th predeterminated voltage is the receptible minimum work of controller
Make voltage, the 5th predeterminated voltage is less than the second predeterminated voltage.In the present embodiment, the locking control module 30 is under-voltage locking mould
Block (UVLO).
The dynamic charge control module (circuit) 40, after starting in controller, the electricity of detection charging capacitor Cin
Pressure, for example, can be by detecting the partial pressure of charging capacitor Cin come the voltage of indirect detection charging capacitor Cin；In charging capacitor Cin
Voltage when reaching three predeterminated voltages, the voltage of the control terminal by dragging down charging current control module 20 be (node Clamp's
Voltage) come charge closing current control module 20, charging capacitor Cin electric discharges, so as to reduce the voltage of charging capacitor Cin；Filling
When the voltage of capacitance Cin is reduced to four predeterminated voltages, the voltage (node of the control terminal of charging current control module 20 is improved
The voltage of Clamp) start charging current control module 20, so as to charge to charging capacitor Cin.3rd predeterminated voltage is big
In the 4th predeterminated voltage.4th predeterminated voltage is more than the 5th predeterminated voltage.
The dynamic charge control module 40 includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, first comparator
Q1, the second comparator Q2, second transistor M2 and charging control logic unit 410；One end of the 3rd resistor R3 is dynamic
The first input end of charge control module 40, one end of connection charging capacitor Cin, the ratio of other end connection first of 3rd resistor R3
One end of normal phase input end and the 4th resistance R4 compared with device Q1；The other end of 4th resistance R4 connects the positive of the second comparator Q2
One end of input terminal and the 5th resistance R5；The other end ground connection of 5th resistance R5；The inverting input of first comparator Q1 and
The inverting input of two comparator Q2 receives reference voltage VREF；The output terminal of first comparator Q1 and the second comparator Q2's
Output terminal is all connected with charging control logic unit 410；The first pole ground connection of second transistor M2；The second pole of second transistor M2
For the output terminal of dynamic charge control module 40, the anode of the first diode D1 and the control pole of the first transistor M1 are connected；The
The output terminal of the control pole connection charging control logic unit 410 of two-transistor M2.Charging control logic unit 410 is used to connect
When receiving the high level signal of the second comparator Q2 outputs, second transistor M2 is opened, closes M1 so as to drag down the voltage of Clamp
It is disconnected；When receiving the high level signal of first comparator Q1 outputs, second transistor M2, and then the electricity of node Clamp are closed
Pressure rise.As it can be seen that reference voltage VREF, the 4th predeterminated voltage determine the resistance value of the 5th resistance R5, reference voltage VREF, the 3rd
Predeterminated voltage determines the resistance value of R5 and R4.In the present embodiment, the second transistor M2 is N-channel MOS pipe, it is controlled extremely
The grid of N-channel MOS pipe, high level are opened, low level shut-off；The source electrode of first extremely N-channel MOS pipe, the second extremely N-channel
The drain electrode of metal-oxide-semiconductor.
For the present invention when the Switching Power Supply of Fig. 2 powers on, peripheral power tube M0 is off state, and the drain electrode Vdrain of M0 is height
Voltage, Vdrain produce an output voltage Vclamp by the startup resistance R1 and clamper Zener D1 of Fig. 4 and connect charging control
The grid of switching tube M1 processed, M1 is opened when Vclamp is increased to the opening threshold value of M1；High voltage DRAIN passes through M1 and limit at this time
Leakage resistance R2 and the second diode D2 produces electric current and charges to the charging capacitor Cin of VDD feet；When the voltage of VDD feet is increased to
During the second predeterminated voltage, UVLO module output signals make controller start to work to controller.
Peripheral power tube M0 is opened after controller starts, and the drain voltage Vdrain of M0 is pulled low to minimum voltage, this
When M0 drain voltages Vdrain be less than the charging capacitor Cin voltages of VDD feet, controller is provided by the charging capacitor Cin of VDD feet
Power supply.
Dynamic charge control module 40 detects the partial pressure (i.e. the partial pressure of Cin) of VDD after controller starts, and passes through detection
The partial pressure of VDD carrys out the voltage of indirect detection VDD；When the voltage of the 5th resistance R5 one end is increased to reference voltage VREF (VDD's
When voltage is increased to three predeterminated voltages), the second comparator Q2 exports high level to charging control logic unit (circuit) 410,
Triggering charging control logic unit 410, which exports high level and opens M2 and Vclamp is pulled low to rapidly to zero and closes M1, to be stopped to VDD
The charging capacitor Cin chargings of foot, vdd voltage is begun to decline at this time, when the voltage (b points voltage) of the 4th resistance R4 one end drops to
During (≤) reference voltage VREF (when vdd voltage drops to four predeterminated voltages), first comparator Q1 exports low level to charging
Control logic unit 410, triggering charging control logic unit 410 export low level and close M2, Vclamp is drawn high and beaten rapidly
The charging capacitor Cin that M1 is opened to VDD charges, and vdd voltage starts to raise, so that the charging capacitor Cin of VDD feet completes a cycle
Charging and discharging process, the present invention continuously repeats process that multiple cycles are charged and discharged so as to fulfill dynamically filling by Cin
Electricity.
3rd predeterminated voltage and the 4th predeterminated voltage determine the operating voltage section of controller.3rd predeterminated voltage
More than the 4th predeterminated voltage；4th predeterminated voltage is more than the 5th predeterminated voltage.Due to first starting controller, restart charging afterwards
Control logic unit 410, therefore the second predeterminated voltage can might be less that the 3rd is default more than the 3rd predeterminated voltage according to demand
Voltage, the second predeterminated voltage can might be less that the 4th predeterminated voltage more than the 4th predeterminated voltage according to demand.
Activation system provided by the invention starts speed, it can be achieved that high voltage startup and the dynamic self-powered to controller
It hurry up, auxiliary winding power supply is not required in the dynamic charging modes after controller starts, and stand-by power consumption is low, and chip integration is high,
Power-supply system peripheral circuit is simple in structure, and pcb board area is small, and solution development cost is low, has higher technical economic benefit.
The failure protection module 50, for receiving fault-signal, when receiving fault-signal, charge closing electric current control
Molding block 20 (shut-off M1), to reduce the voltage of charging capacitor, to protect controller.Specifically, when controller detects failure
After signal, export and force output or forced charge control logic unit to the failure protection module 50, failure protection module 50
410 one high level of output open M2 so as to close M1 pipes, and the charging capacitor Cin of VDD feet cannot continue charging therefore its voltage is opened
Begin to decline, when vdd voltage drops to five predeterminated voltages, lock 30 closing control device of control module；Afterwards, the charging control
Logic unit 410 processed exports low level shut-off M2, charges so as to draw high Vclamp and open M1 to the charging capacitor Cin of VDD, again
Start controller, if controller still detects power failure after restarting, repeat the process of above-mentioned charging and discharging until electricity
Source trouble shooting so as to fulfill power-supply system error protection and self-recovering function.
Embodiment two：
In the present embodiment, the function of the charging control logic unit 410 and failure protection module 50 is by Switching Power Supply
Controller is completed, and in other words, the charging control logic unit 410 and failure protection module 50 are incorporated into inside controller,
Control circuit forms for controlling switch power supply and can realize high voltage startup and dynamic self-powered control chip (such as Fig. 5, Fig. 2
In shown in 3), other structures are identical with embodiment one.The primary side winding of the DRAIN ends connection transformer 80 of the control chip 3
One end of Lp and the second pole of power transistor M0；One output terminal of the GATE ends of the control chip 3 device in order to control, connection electricity
The control pole of source transistor M0；The first pole of the CS ends connection power transistor M0 of the control chip 3 and sampling resistor Rcs's
One end；One end of vdd terminal (power end) the connection charging capacitor Cin of the control chip.The power transistor M0 is power
Pipe, N-channel MOS pipe, it controls extremely grid of power tube M0, the first extremely source electrode of power tube M0, the second extremely power tube
The drain electrode of M0.
In the present embodiment, the main circuit of the Switching Power Supply further includes the first capacitance C1, the second capacitance C2, the 3rd capacitance
C3, the 4th capacitance C4, the 3rd diode D3, the 4th diode D4, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th
Resistance R9, the tenth resistance R10, optocoupler Q3 and controllable accurate source of stable pressure T.The output terminal of the rectification module 70 connects the first capacitance
One end of C1, one end of the 6th resistance R6, the other end of one end of the second capacitance C2 and transformer primary side winding Lp；Described first
The other end ground connection of capacitance C1；The other end of 6th resistance R6 connects the other end of the second capacitance C2 and bearing for the 3rd diode D3
Pole, the cathode of the 3rd diode D3 connect one end of primary side winding Lp, the drain electrode of power tube M0 and control chip 3
DRAIN.One end ground connection of the secondary windings Ls of the transformer 80, the other end connection of the secondary windings Ls of the transformer 80
The cathode of 4th diode D4, the anode of the 4th diode D4 connect one end of the 7th resistance R7, one end of the 8th resistance R8, the
One end of nine resistance R9, and be grounded by the 3rd capacitance C3.The first end of the other end connection optocoupler Q3 of 7th resistance R7, optocoupler
Output terminal, the other end of the 8th resistance R8 and one end of the 4th capacitance C4 of the second end connection controllable accurate source of stable pressure T of Q3；Institute
The other end for stating the 4th capacitance C4 connects the other end of the 9th resistance R9, one end of the tenth resistance R10 and controllable accurate source of stable pressure T
Input terminal, the tenth resistance R10 the other end ground connection.The FB ends of the 3rd end connection control chip 3 of the optocoupler Q3, institute
State the 4th end ground connection of optocoupler Q3.The model TL431 of the controllable accurate source of stable pressure T.
Use above specific case is illustrated the present invention, is only intended to help and understands the present invention, not limiting
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make some simple
Deduce, deform or replace.
Claims (10)
- A kind of 1. activation system of switch power controller, it is characterised in that including：The starting module at externally fed end is connected, for when the voltage of itself reaches the first predeterminated voltage, opening charging current Control module；Charging current control module, for producing the charging current to charging capacitor charging；Control module is locked, for when the voltage of charging capacitor is increased to the second predeterminated voltage, starting controller；Dynamic charge control module, for detecting the voltage of charging capacitor, reaches the 3rd predeterminated voltage in the voltage of charging capacitor When, charge closing current control module, to reduce the voltage of charging capacitor；The 4th default electricity is reduced in the voltage of charging capacitor During pressure, start charging current control module；3rd predeterminated voltage is more than the 4th predeterminated voltage；Failure protection module, for receiving fault-signal, when receiving fault-signal, charge closing current control module, with Reduce the voltage of charging capacitor.
- 2. the activation system of switch power controller as claimed in claim 1, it is characterised in that the locking control module is also For when the voltage of charging capacitor is reduced to five predeterminated voltages, closing control device；It is default that 5th predeterminated voltage is less than second Voltage, the 4th predeterminated voltage.
- 3. the activation system of switch power controller as claimed in claim 1, it is characterised in that the starting module includes the One resistance and the first diode；One end connection externally fed end of the first resistor；The other end of the first resistor is to open The output terminal of dynamic model block, connects the control terminal of charging current control module and the anode of the first diode, the first diode is just Pole is grounded.
- 4. the activation system of switch power controller as claimed in claim 3, it is characterised in that the charging current controls mould Block includes the first transistor, second resistance and the second diode；The control of the first transistor extremely charging current control mould The control terminal of block, connects the anode of the first diode；First pole of the first transistor connects the two or two by second resistance The cathode of pole pipe, the second pole connection externally fed end of the first transistor；The anode of second diode is charging current control The output terminal of molding block, connects one end of charging capacitor and the input terminal of locking control module；The other end of the charging capacitor Ground connection；The first transistor high level turns on.
- 5. the activation system of switch power controller as claimed in claim 1, it is characterised in that it is described locking control module be Under-voltage locking module.
- 6. the activation system of switch power controller as claimed in claim 4, it is characterised in that the dynamic charge control mould Block is patrolled including 3rd resistor, the 4th resistance, the 5th resistance, first comparator, the second comparator, second transistor and charge control Collect unit；One end of one end connection charging capacitor of the 3rd resistor, the other end connection first comparator of 3rd resistor One end of normal phase input end and the 4th resistance；The other end of 4th resistance connects the normal phase input end and the 5th electricity of the second comparator One end of resistance；The other end ground connection of 5th resistance；The inverting input of the inverting input of first comparator and the second comparator Receive reference voltage；The output terminal of the output terminal of first comparator and the second comparator is all connected with charging control logic unit； The first pole ground connection of second transistor, the second pole of second transistor connect the anode of the first diode；The control of second transistor The output terminal of connection charging control logic unit in pole processed；Charging control logic unit is used to receive the output of the second comparator During high level signal, second transistor is opened；When receiving the high level signal of first comparator output, the second crystal is closed Pipe.
- 7. a kind of control circuit of Switching Power Supply, it is characterised in that including controller and as claimed in any one of claims 1 to 6 Activation system；The power end connection locking control module of the controller.
- 8. the control circuit of Switching Power Supply as claimed in claim 7, it is characterised in that further include charging capacitor, power supply crystal Pipe and sampling resistor；First pole of the power transistor is grounded by sampling resistor, and the control pole of the power transistor connects Connect the output terminal of controller, the main circuit of the first pole connecting valve power supply of the power transistor.
- 9. a kind of Switching Power Supply, it is characterised in that including control circuit as claimed in claim 8 and main circuit；The main electricity Road includes：Rectification module, for being direct current by power grid AC rectification；Transformer, for changing the voltage of the direct current.
- 10. Switching Power Supply as claimed in claim 9, it is characterised in that the Switching Power Supply is AC-DC Switching Power Supplies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810020171.9A CN107994763A (en) | 2018-01-09 | 2018-01-09 | A kind of Switching Power Supply and its control circuit, the activation system of controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810020171.9A CN107994763A (en) | 2018-01-09 | 2018-01-09 | A kind of Switching Power Supply and its control circuit, the activation system of controller |
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| CN107994763A true CN107994763A (en) | 2018-05-04 |
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| CN201810020171.9A Pending CN107994763A (en) | 2018-01-09 | 2018-01-09 | A kind of Switching Power Supply and its control circuit, the activation system of controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655363A (en) * | 2021-09-13 | 2021-11-16 | 东科半导体(安徽)股份有限公司 | On-line testing circuit for conduction voltage drop of main switching tube of switching power supply |
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