CN108667316A - Ac-input type Switching Power Supply - Google Patents
Ac-input type Switching Power Supply Download PDFInfo
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- CN108667316A CN108667316A CN201810696253.5A CN201810696253A CN108667316A CN 108667316 A CN108667316 A CN 108667316A CN 201810696253 A CN201810696253 A CN 201810696253A CN 108667316 A CN108667316 A CN 108667316A
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000004146 energy storage Methods 0.000 claims abstract description 15
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- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
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- 230000005764 inhibitory process Effects 0.000 description 2
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Classifications
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- 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
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- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
Present invention is disclosed a kind of ac-input type Switching Power Supplies, including：The exchange input module being sequentially connected, rectification module, switch module, energy-storage module, the Switching Power Supply further includes detection control module, the input terminal of the detection control module is connected between exchange input module and the rectification module, output end connects the switch module, the exchange input module is for connecting external communication electricity, the rectification module is used to alternating current being converted to direct current, the switch module is powered for realizing the switch of the Switching Power Supply, the energy-storage module is used to the direct current of stable storage and exports use to external power circuit, the detection control module is used to detect the zero of alternating current, and it controls the switch module and carries out switching.In invention Switching Power Supply when zero cross detection circuit detects that alternating current is in positive half cycle, it will accurately captured to the zero crossing of next cycle and high speed electronic switch pipe is driven to be closed, minimize surge current.
Description
Technical field
The present invention relates to the detection of the voltage zero-cross of power technique fields, especially ac-input type Switching Power Supply and surge suppressions
Technology processed.
Background technology
The most of electrical equipment of today's society is all powered using Switching Power Supply, and Switching Power Supply input AC rectification with
It is typically necessary the capacitance smothing filtering of a large capacity afterwards, generates a metastable direct current and is returned as main power conversion
The power supply on road, due to the presence of this bulky capacitor, electric current i=K*C* △ U/ △ t/ of generation after being powered up according to capacitance both ends
ESR（Formula is 1.）, wherein K is constant, and C is capacitance, and △ U are the voltage varieties for being added in capacitance both ends, and △ t are capacitance two
End generates the time used in voltage variety △ U, and ESR is the equivalent resistance in circuit, it can be seen that electric current i and capacitance C
And moment be added to capacitance both ends voltage △ U it is directly proportional, be inversely proportional with equivalent series resistance ESR and the △ t in circuit,
The voltage at this bulky capacitor both ends is zero before exchange electrically connects, if not taking the moment that current limiting measures are electrically connected in exchange that can produce
Raw very big dash current, that is, surge current, surge current have prodigious harm to power grid and Switching Power Supply itself, therefore,
Switching Power Supply will limit this surge current.The method of limit inrush currents mainly has following three kinds at present.
The first is using methods most earliest, is exactly the temperature-sensitive electricity of one negative temperature coefficient of series connection on incoming line
Hinder R1, that is, the equivalent series resistance ESR in increasing formula 1., exchange when electrically connecting R1 play metering function, R1 works meeting
Certain electric energy fever is consumed, its temperature gradually rises and the resistance value of its own then decline reduction itself therewith with continue working
Power consumption.The main problem of this circuit has two, one is selecting the big R1 of resistance value, then Surge suppression effect is preferably but its work(
Consumption large volume is big and of high cost, if although the R1 for selecting resistance value small reduces power consumption, volume and cost, but to surge current
Inhibition is bad, the second is being not suitable for the application scenario of frequent shutdown/booting, due to the thermistor R1 of negative temperature coefficient
Temperature cannot quickly lower therefore its resistance value can not quickly recover to normal resistance value, frequently to surge current when shutdown booting
Inhibition it is limited.
Second is the improvement of the first, and the method is electric by current limliting using a relay K1 after power supply normal work
Resistance R1 is shorted out, and avoids the energy loss that electric current in the course of work flows through R1 generations in this way, but the method is still paid no attention to
Think, selecting resistance to reach, ideal Surge suppression effect resistance volume is larger, and therefore, second method is nor a perfection
Solution.
The third be using the method detection alternating current of microcontroller and corresponding software zero and voltage zero-cross control after
Electric appliance is attracted to reduce surge current, the main problem of the method, one is zero passage detection method can not be accurately detected exchange
The real zero of voltage, since it uses diode detection zero, and diode is can not to accomplish just to be connected until zero volt or cut
Only, when voltage is less than certain voltage value, control unit is considered as having had reached zero crossing, in fact alternating current at this time
It is the forward voltage drop of diode D1 D2 that pressure value, which still has Vd+Vz+i*R, Vd, and Vz is the voltage of voltage regulation of zener diode D3 D4, i
To flow through the electric current of resistance R1/R2/D1/D2/D3/D4, R is the resistance value of R1R2, is judged according to the specification of conventional zener diode
The voltage has the three ten-day period of hot season to tens of volts, it is clear that and real point of zero voltage greatly differs from each other；The second is the contact of relay from open circuit to
The actuation time of actuation is Millisecond, generally 2-20mS, and has prodigious discrete type, i.e., the same same model of producer is same
Batch product each pull up time it is variant, and general alternating current is 50Hz/60Hz, half period when
Between be 10mS/8.3mS, it can be seen that the half period time of pull up time and alternating current is substantially suitable, from
It detects zero and assigns the zero for being attracted and the when of being attracted to relay being instructed not to be alternating current, in some instances it may even be possible to be the peak of alternating current
Value, it is contemplated that the discrete type of relay actuation time wants that each relay is controlled by way of software to be closed in zero
It is also impossible；Third, the relay K1 in the method circuit can not use the high speed devices such as metal-oxide-semiconductor or IGBT to replace
Generation because its a parasitic diode between DS, the presence of this diode cause MOS, IGBT etc. to be unidirectional cutoff in vivo
Device, and alternating current is two-way, this device can not accomplish two-way stop, and total there are one the uncontrolled conductings in direction；Its
Four, the cycle time due to its control to be calculated according to cycle detection before controls, when mains frequency has saltus step, control
The instruction of relay processed is still according to the execution calculated before, therefore nor real-time zero after saltus step.
Invention content
The purpose of the present invention is exactly to provide a kind of ac-input type and open to solve the above-mentioned problems in the prior art
Powered-down source, precision is high, is switched in time in the zero of voltage transformation, and speed is fast, low in energy consumption.
The purpose of the present invention is achieved through the following technical solutions：
A kind of ac-input type Switching Power Supply, including：The exchange input module that is sequentially connected, rectification module, switch module, energy storage
Module, the Switching Power Supply further include detection control module, and it is defeated that the input terminal for detecting control module is connected to the exchange
Enter between module and rectification module, output end connects the switch module, and the exchange input module is for connecting external communication
Electricity, the rectification module are used to alternating current being converted to direct current, and the switch module is opened for realizing the Switching Power Supply
Power supply is closed, the energy-storage module is used to the direct current of stable storage and exports use to external power circuit, the detection control
Module is used to detect the zero of alternating current, and controls the switch module and carry out switching.
Further, the exchange input module is exchange input connector J1, has zero line L and zero line side N.
Further, the rectification module is bridge rectifier, is bridge rectifier（Rectifier bridge）BD1 has two exchanges defeated
Enter end and direct current output anode, direct current output negative terminal, the zero line L connections bridge rectifier of the exchange input connector J1
An ac input end of circuit BD1, the zero line side N connections bridge rectifier BD1 of the exchange input connector J1
Another ac input end, the direct current output anode of the bridge rectifier BD1 connects the energy-storage module, and direct current is defeated
Go out negative terminal connection reference ground GND networks.
Further, the energy-storage module is that the anode of capacitance C1, the capacitance C1 connect the bridge rectifier BD1's
Direct current output anode and DC+ networks as the Switching Power Supply, DC- network of the cathode as the Switching Power Supply.
Further, the detection control module includes zero cross detection circuit and drive control circuit；The zero passage detection electricity
Road includes operational amplifier U1, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, comparator U2, the 7th
Resistance R7；Wherein, the one end the first resistor R1 connects the zero line side N of the exchange input connector J1, other end connection
The reverse input end of the operational amplifier U1；The one end the second resistance R2 connects the reversed input of the operational amplifier U1
End, other end connect the output end of the operational amplifier U1；The one end the 3rd resistor R3 connects the exchange input and connects
The zero line L of device J1 is met, other end connects the positive input of the operational amplifier U1；The one end the 4th resistance R4 connects
The positive input of the operational amplifier U1 is connect, other end connects reference ground GND networks；The operational amplifier U1's is defeated
Outlet connects the positive input of the comparator U2, and the reverse input end of the comparator U2 connects reference ground GND networks；Institute
The output end for stating comparator U2 connects the drive control circuit, pull-up electricity of the 7th resistance R7 as the comparator U2
Resistance, one end connect the output end of the comparator U2, other end connection+VCC.
Further, the drive control circuit includes shift register U3, the 5th resistance R5, the 6th resistance R6, driving three
Pole pipe T2；The ends input terminal D connections+VCC, CLK of the shift register U3 connect the output end of the comparator U2, output end
Q1 connects one end of the 5th resistance R5；The other end of the 5th resistance R5 connects the base of the driving triode T2
Pole；Collector connection+the VCC of the driving triode T2；Emitter connects one end of the 6th resistance R6, and exports control
Signal CTL；The other end of the 6th resistance R6 connects reference ground GND networks.
Further, the switch module includes switch transistor T 1, and the drain electrode of the switch transistor T 1 connects the energy-storage module, source
Pole connects reference ground GND network of network, and grid connects the control signal CTL.
Further, the Switching Power Supply further includes protection module, and the protection module is connected to the exchange input module
Between rectification module, for carrying out overcurrent protection to entire Switching Power Supply, the protection module is fuse F1.
The advantages of technical solution of the present invention, is mainly reflected in：
1, pure hardware detection ac frequency can monitor ac frequency variation in real time, accurate to capture each of alternating voltage
Each zero of secondary zero passage, precision are high；
2, switching tube is mounted on the DC side of rectifier bridge output, and alternating current at this time has been rectified bridge rectification and has unidirectionally pulsed
Direct current, therefore the high speed device of the unidirectional cutoffs such as metal-oxide-semiconductor, IGBT can be used, using high speed switch tube, in voltage over zero and
When connection alternating current to commutating circuit on, go code from assigning to electronic switch turn-on time at most several microseconds, when delay
Between can be ignored with respect to the 10mS/8.3mS of alternating current half period, speed is exceedingly fast；
3, save current-limiting resistance, reduce unnecessary energy expenditure and improve power-efficient；Fourth, using a small amount of operation amplifier
The devices such as device, comparator, shift register, switching tube, circuit are simple, small and at low cost.
Description of the drawings
Fig. 1 is the functional block diagram of switch power supply；
Fig. 2 is the circuit diagram of switch power supply.
Specific implementation mode
The purpose of the present invention, advantage and feature, by by the non-limitative illustration of preferred embodiment below carry out diagram and
It explains.These embodiments are only the prominent examples using technical solution of the present invention, it is all take equivalent replacement or equivalent transformation and
The technical solution of formation, all falls within the scope of protection of present invention.
It is shown in Figure 1, one embodiment of the invention ac-input type Switching Power Supply, including：The exchange being sequentially connected is defeated
Enter module, rectification module, switch module, energy-storage module.The Switching Power Supply further includes detection control module, the detection control
The input terminal of module is connected between exchange input module and the rectification module, and output end connects the switch module.It is described
Switching Power Supply further includes protection module, and the protection module is connected between exchange input module and the rectification module.It is described
Exchange input module is for connecting external communication electricity.The rectification module is used to alternating current being converted to direct current.The switch
Module is powered for realizing the switch of the Switching Power Supply.The energy-storage module is used for the direct current of stable storage and exports to outer
Portion's power circuit uses.The detection control module is used to detect the zero of alternating current, and controls the switch module and opened
Concern is changed.The protection module is used to carry out overcurrent protection to entire Switching Power Supply.Each module will be specifically described below.
In this embodiment, the exchange input module is exchange input connector J1, external connection alternating current.Institute
It is bridge rectifier, specially rectifier bridge BD1 to state rectification module.The protection module is fuse F1.The energy-storage module
For capacitance C1.The zero line L of the exchange input connector J1 connects one end of the fuse F1, and the fuse F1's is another
Outer one end connects an ac input end of the bridge rectifier BD1.The zero line side N of the exchange input connector J1 connects
Connect another ac input end of the bridge rectifier BD1.The direct current output anode of the bridge rectifier BD1 connects
The anode of capacitance C1 is connect, direct current output negative terminal connects reference ground GND networks.The anode of the capacitance C1 is as the Switching Power Supply
DC+ networks, DC- network of the cathode as the Switching Power Supply.
The detection control module includes zero cross detection circuit and drive control circuit.The zero cross detection circuit includes fortune
Calculate amplifier U1, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, comparator U2, the 7th resistance R7；Its
In, the one end the first resistor R1 connects the zero line side N of the exchange input connector J1, and other end connects the operation and puts
The reverse input end of big device U1；The one end the second resistance R2 connects the reverse input end of the operational amplifier U1, and in addition one
End connects the output end of the operational amplifier U1；The one end the 3rd resistor R3 connects the fire of the exchange input connector J1
Line end L, other end connect the positive input of the operational amplifier U1；The one end the 4th resistance R4 connects the operation
The positive input of amplifier U1, other end connect reference ground GND networks；The output end of the operational amplifier U1 connects institute
The positive input of comparator U2 is stated, the reverse input end of the comparator U2 connects reference ground GND networks；The comparator U2
Output end connect the drive control circuit, pull-up resistors of the 7th resistance R7 as the comparator U2, one end
Connect the output end of the comparator U2, other end connection+VCC.
The drive control circuit includes shift register U3, the 5th resistance R5, the 6th resistance R6, driving triode T2；
The ends input terminal D connections+VCC, CLK of the shift register U3 connect the output end of the comparator U2, output end Q1 connections
One end of the 5th resistance R5；The other end of the 5th resistance R5 connects the base stage of the driving triode T2；It is described
Drive the collector connection+VCC of triode T2；Emitter connects one end of the 6th resistance R6, and exports control signal
CTL；The other end of the 6th resistance R6 connects reference ground GND networks.
In the present embodiment, there are four output end Q0, Q1, Q2, Q3 for the shift register U3 tools, can arbitrarily select Q1-
The difference of the output end that the one of output ends of Q3 are actually used as the shift register U3, three outputs is exactly when postponing
Between it is different, Q1 is with respect to Q0 delay times for from powering on constantly to the time the zero crossing of first positive half period（Less than etc.
In a cycle time）, Q2 again with respect to Q1 more postpones a complete alternating current period, and Q3 again with respect to Q2 more postpones an alternating current week
Phase, and Q0 is occurred as soon as connecting the alternating current moment（High level）, without delay time, it is not necessarily zero at this time, therefore Q0 is not
It can use.In the present embodiment, it is that the output end for selecting output end Q1 to be actually used as the shift register U3 goes to connection institute
State one end of resistance R5.
The switch module includes switch transistor T 1, the cathode of the drain electrode connection capacitance C1 of the switch transistor T 1, source electrode connection
Reference ground GND network of network, grid connect the control signal CTL.
In this embodiment, the operational amplifier U1 uses differential operational amplifier LM2904, the comparator
U2 uses LM239DG, the shift register U3 that CD4015BP, the driving triode T2 is used to use FZT651, described to open
It closing pipe T1 and uses high speed electronic switch pipe N-channel MOS pipe, it can also use SCR, GTO, IGBT, solid-state relay etc. certainly,
The The concrete specifications such as its model specification and other devices such as bridge rectifier BD1, capacitance C1, fuse F1 can be according to actual
The combined factors such as circuit power/size of current and other performance requirement consider.
The concrete operating principle of entire circuit is as follows：
（1）The operation that the operational amplifier U1, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 are constituted
High Level AC Voltage is contracted within the input voltage range that the comparator U2 allows by amplifier circuit by a certain percentage, if R1
=R3, R2=R4, then operational amplifier ratio is R2/R1；
（2）Within the positive half period time of alternating current, the positive input of the comparator U2 is that positive pressure is higher than reverse input end
The voltage of GND (zero volt), the comparator U2 export high level；Accordingly within the negative half-cycle time of alternating current, the ratio
Positive input compared with device U2 is that negative pressure is less than reverse input end GND（Zero volt）Voltage, the comparator U2 exports low level；
（3）Voltage is zero on capacitance C1 before powering on, and output end Q0, Q1, Q2, Q3 of the shift register U3 are low electricity
It is flat；After having on alternating current to the exchange input connector J1, when first positive half period of alternating current arrives, the comparison
Device U2 exports high level to the input terminal of the shift register U3, the i.e. ends CLK, and the shift register U3 triggers for rising edge
Then the output end Q0 outputs of the shift register U3 become high level, and output end Q1, Q2, Q3 remain as low level；Alternating current
When changing from positive half period to negative half-cycle, the comparator U2 exports low level, and the shift register U3 is not triggered, defeated
It does well and remains unchanged；When next time, alternating current exports again from negative half axial positive axis zero passage point moment, the comparator U2
High level, rising edge trigger the shift register U3 actions, then output end Q1, Q0 is high level, output end Q1 high level
Drive control drives triode T2 conductings, then the grid of the PN junctions of+VCC through the switch transistor T 1 to the driving triode T2 drive
The dynamic driving triode T2 conductings, i.e.+VCC are connected via the driving triode T2 driving switch pipes T1, and alternating current passes through
The fuse F1 and bridge rectifier BD1, the beginning of the switch transistor T 1 charge to capacitance C1 from zero volt；Work as friendship
After galvanic electricity is again introduced into negative half-cycle, the output of the output end Q1 of the shift register U3 persistently keeps high level, the drive
Dynamic triode T2, switch transistor T 1 continue to be held on ... ... and so on, circulating repetition；
（4）After exchange input power-off, output end Q0, Q1, Q2, Q3 of the shift register U3 restore initial low level, institute
State the cut-off of switch transistor T 1；Again after the power is turned on according to step（3）Process task again.
Because according to formula 1. it is found that reach relevant performance indicator capacitance C in determining products application basic
It is to determine, thinks that it is also unpractical infinitely to reduce capacitance C, and had the shortcomings that using series resistance many in background technology
In also it is stated that, these methods are all undesirable.Therefore, city is effectively inhibited to electrically connect the surge current of moment, it is contemplated that by subtracting
The voltage difference △ U at capacitance both ends when small connection are realized, according to line voltage are sinusoidal waveform, instantaneous value V (t)=UoSin
(wt)（Formula is 2.）, wherein Uo is the peak value of sine wave, and the SIN function of Sin (wt) time t, value is at the time of certain（n*
180 ° of moment, wherein n are integer）It is zero, if selection connects alternating current in the zero crossing of the SIN function, surge current can quilt
It is suppressed to minimum.
Pass through zero cross detection circuit, the phases interworking such as electronic switching tube of drive control circuit, high speed in invention Switching Power Supply
It closes, when zero cross detection circuit detects that alternating current is in positive half cycle, it will accurately captured to the zero crossing of next cycle
And high speed electronic switch pipe is driven to be closed, minimize surge current.
Main advantages of the present invention have：First, pure hardware detection ac frequency, can monitor ac frequency change in real time
Change, each zero of the accurate zero passage each time for capturing alternating voltage, precision is high；Second, switching tube is mounted on rectifier bridge
The DC side of output, it is the direct current unidirectionally pulsed that alternating current at this time, which has been rectified bridge rectification, thus can use metal-oxide-semiconductor,
The high speed device of the unidirectional cutoffs such as IGBT timely connects alternating current to commutating circuit using high speed switch tube in voltage over zero
On, it goes code from assigning to electronic switch turn-on time at most several microseconds, delay time is with respect to alternating current half period
10mS/8.3mS can be ignored, speed is exceedingly fast；Third, saving current-limiting resistance, reduces unnecessary energy expenditure and improve electricity
Source efficiency；Fourth, using devices such as a small amount of operational amplifier, comparator, shift register, switching tubes, circuit is simple, volume
It is small and at low cost.
Still there are many embodiment, all technical sides formed using equivalents or equivalent transformation by the present invention
Case is within the scope of the present invention.
Claims (9)
1. a kind of ac-input type Switching Power Supply, which is characterized in that including：The exchange input module that is sequentially connected, rectification module,
Switch module, energy-storage module, the Switching Power Supply further include detection control module, the input terminal connection of the detection control module
Between exchange input module and the rectification module, output end connects the switch module, and the exchange input module is used for
External communication electricity is connected, the rectification module is used to alternating current being converted to direct current, and the switch module is for realizing described
The switch of Switching Power Supply is powered, and the energy-storage module is used to the direct current of stable storage and exports use to external power circuit,
The detection control module is used to detect the zero of alternating current, and controls the switch module and carry out switching.
2. ac-input type Switching Power Supply according to claim 1, it is characterised in that：The exchange input module is exchange
Input connector（J1）, there is zero line（L）And zero line side（N）.
3. ac-input type Switching Power Supply according to claim 2, it is characterised in that：The rectification module is bridge rectifier
Circuit（BD1）, there is two ac input ends and a direct current output plus terminal, a direct current output negative terminal, the exchange input connector
（J1）Zero line（L）Connect the bridge rectifier（BD1）An ac input end, the exchange input connector
（J1）Zero line side（N）Connect the bridge rectifier（BD1）Another ac input end, the bridge rectifier
（BD1）Direct current output anode connect the energy-storage module, direct current output negative terminal connects reference ground GND networks.
4. ac-input type Switching Power Supply according to claim 3, it is characterised in that：The energy-storage module is capacitance
（C1）, the capacitance（C1）Anode connect the bridge rectifier（BD1）Direct current output anode and as the switch
The DC+ networks of power supply, DC- network of the cathode as the Switching Power Supply.
5. according to any ac-input type Switching Power Supplies of claim 2-4, it is characterised in that：The detection control module
Including zero cross detection circuit and drive control circuit.
6. ac-input type Switching Power Supply according to claim 5, it is characterised in that：The zero cross detection circuit includes fortune
Calculate amplifier（U1）, first resistor（R1）, second resistance（R2）, 3rd resistor（R3）, the 4th resistance（R4）, comparator（U2）、
7th resistance（R7）；Wherein, the first resistor（R1）One end connect the exchange input connector（J1）Zero line side
（N）, the other end connection operational amplifier（U1）Reverse input end；The second resistance（R2）One end connection described in
Operational amplifier（U1）Reverse input end, other end connects the operational amplifier（U1）Output end；The third electricity
Resistance（R3）One end connect the exchange input connector（J1）Zero line（L）, the other end connection operational amplifier
（U1）Positive input；4th resistance（R4）One end connect the operational amplifier（U1）Positive input, separately
Outer one end connects reference ground GND networks；The operational amplifier（U1）Output end connect the comparator（U2）Forward direction it is defeated
Enter end, the comparator（U2）Reverse input end connect reference ground GND networks；The comparator（U2）Output end connect institute
State drive control circuit, the 7th resistance（R7）As the comparator（U2）Pull-up resistor, one end connects the ratio
Compared with device（U2）Output end, other end connection+VCC.
7. ac-input type Switching Power Supply according to claim 6, it is characterised in that：The drive control circuit includes moving
Bit register（U3）, the 5th resistance（R5）, the 6th resistance（R6）, driving triode（T2）；The shift register（U3）It is defeated
Enter end（D）The ends connection+VCC, CLK connect the comparator（U2）Output end, output end（Q1）Connect the 5th resistance
（R5）One end；5th resistance（R5）Other end connect the driving triode（T2）Base stage；The driving three
Pole pipe（T2）Collector connection+VCC；Emitter connects the 6th resistance（R6）One end, and export control signal CTL；
6th resistance（R6）Other end connect reference ground GND networks.
8. ac-input type Switching Power Supply according to claim 7, it is characterised in that：The switch module includes switching tube
（T1）, the switching tube（T1）Drain electrode connect the energy-storage module, source electrode connects reference ground GND networks, described in grid connection
Control signal CTL.
9. ac-input type Switching Power Supply according to claim 1, it is characterised in that：The Switching Power Supply further includes protection
Module, the protection module are connected between exchange input module and the rectification module, for being carried out to entire Switching Power Supply
Overcurrent protection, the protection module are fuse（F1）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810696253.5A CN108667316A (en) | 2018-06-29 | 2018-06-29 | Ac-input type Switching Power Supply |
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| CN110492768A (en) * | 2019-08-13 | 2019-11-22 | 苏州格远电气有限公司 | Rectifier circuit |
| CN112968616A (en) * | 2021-02-19 | 2021-06-15 | 北京泰力控科技有限公司 | AC-DC converter and AC-DC conversion system |
| CN115498746A (en) * | 2022-11-07 | 2022-12-20 | 广东希荻微电子股份有限公司 | Power supply circuit, power supply method and electronic equipment |
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