CN106655834A - Quasi-resonant primary-side constant-current control circuit and alternating current-direct current converter with the circuit - Google Patents
Quasi-resonant primary-side constant-current control circuit and alternating current-direct current converter with the circuit Download PDFInfo
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- CN106655834A CN106655834A CN201610875674.5A CN201610875674A CN106655834A CN 106655834 A CN106655834 A CN 106655834A CN 201610875674 A CN201610875674 A CN 201610875674A CN 106655834 A CN106655834 A CN 106655834A
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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
- 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
- H02M7/219—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 in a bridge configuration
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- 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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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a quasi-resonant primary-side constant-current control circuit and an alternating current-direct current converter with the circuit. The quasi-resonant primary-side constant-current control circuit comprises a sampling detector, a constant-current conduction signal controller, a constant-current turning-off signal controller, and a constant-current switch driver. The sampling detector is used for detecting a line voltage, collecting a primary-side voltage signal and a primary-side current signal, and generating a valley detection signal, a primary-side voltage time sequence signal and a primary-side current sampling and amplifying signal. The constant-current conduction signal controller is used for a constant-current switching conduction signal according to the valley detection signal, the primary-side voltage time sequence signal and a PFM signal. The constant-current turning-off signal controller is used for generating a constant-current switch turning-off signal based on the primary-side current sampling and amplifying signal, a current-limiting reference voltage signal and the primary-side voltage time sequence signal. The constant-current switch driver is used for generating a switch driving signal for driving a switching tube according to the constant-current switching conduction signal and the constant-current switch turning-off signal. On the basis of the quasi-resonant control technique, the maximum operating frequency and work efficiency can be improved, the cost can be reduced, and the electromagnetic interference can be reduced substantially.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of quasi-resonance former limit constant-current control circuit and have
The AC/DC changeover switch of the circuit.
Background technology
AC/DC changeover switch (AC-DC converter) is exactly that alternating current is changed into galvanic equipment, and its power flow direction can be with
It is two-way, power flow is flowed to the rectification that is referred to as of load by power supply, power flow is returned the referred to as active inversion of power supply by loading.
The input of AC/DC converters for 50/60Hz alternating current, because must it is rectified, filter, therefore the relatively large filter capacitor of volume
Device is requisite, while the restriction (such as IEC, FCC, CSA) because running into safety standard (such as UL, CCEE) and EMC instructions,
Exchange input side must add EMC to filter and using the element for meeting safety standard, thus limit the small-sized of AC/DC power volumes
Change, further, since the high frequency of inside, high pressure, high-current switch action so that solve EMC electromagnetic compatibility problems difficulty and increase,
Just very high requirement is proposed to internal high-density installation circuit design, by the same token, high voltage, high-current switch make
Power work consumption increase is obtained, the process of AC/DC converter modules is limited, it is therefore necessary to using power-supply system optimization design
Method can just make its operating efficiency reach certain satisfaction.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided a kind of quasi-resonance former limit constant-current control circuit and tool
There is the AC/DC changeover switch of the circuit, by using quasi-resonance control technology, improve maximum operation frequency and operating efficiency, drop
Low cost, and due to switch tube zero voltage turn-on, substantially reduce electromagnetic interference.
The purpose of the present invention is achieved through the following technical solutions：Quasi-resonance former limit constant-current control circuit, is arranged at
In AC/DC changeover switch, the quasi-resonance former limit constant-current control circuit includes：
Sampling detector, for detecting line voltage and gathering original edge voltage signal and primary current signal, and by the friendship
Original edge voltage signal when the switching tube of direct current transducer is turned off enters with the voltage amplification reference voltage signal in sampling detector
Go to compare and obtain valley detection signal and original edge voltage clock signal, and the primary current signal when switching tube is turned on
It is compared with Current amplifier reference voltage signal and obtains primary current amplifier signal；
Constant current Continuity signal controller, for according to valley detection signal, original edge voltage clock signal and sampling detector
The PFM signals for sending carry out logical operation and obtain quasi-resonance turn-on logic signal, and by the quasi-resonance turn-on logic signal with
The signal that frequency limit device sends is compared and obtains constant current switch Continuity signal；
Constant current cut-off signals controller, for being controlled according to the primary current amplifier signal and constant current Continuity signal
The current limliting reference voltage signal that device sends obtains current limliting cut-off signals, and according to the original edge voltage clock signal constant current benchmark is obtained
Voltage signal, the primary current amplifier signal and constant current reference voltage signal are compared and obtain constant current cut-off signals,
And generate constant current switch cut-off signals according to constant current cut-off signals and current limliting cut-off signals；
Constant current switch driver, for generating and being used for according to the constant current switch Continuity signal and constant current switch cut-off signals
Drive the switching drive signal of the switching tube.
The sampling detector includes：
Voltage sampling unit, for Cycle by Cycle the original edge voltage signal is gathered；
Current sampling unit, for Cycle by Cycle the primary current signal is gathered；
Reference voltage source, for producing voltage amplification reference voltage signal, Current amplifier reference voltage signal, voltage sequential
Detection reference voltage signal and current limliting reference voltage signal, and voltage amplification reference voltage signal is sent to voltage amplifier,
Current amplifier reference voltage signal is sent to current amplifier, voltage time-series rules reference voltage signal is sent to former limit electricity
Pressure Sequence Detector, current limliting reference voltage signal is sent to constant current Continuity signal controller；
Voltage amplifier, for being amplified to the original edge voltage signal；
Current amplifier, for being amplified to the primary current signal primary current amplifier letter is obtained
Number；
Original edge voltage Sequence Detector, for the original edge voltage signal after amplification to be carried out into logical operation valley detection is obtained
Signal and original edge voltage clock signal；
Self adaptation oblique wave compensation unit, for obtaining the line voltage, and the primary current letter according to line voltage compensation
Number.
The original edge voltage Sequence Detector is used to produce the PFM signals, and the PFM signals are sent to constant current conducting
Signal controller.
The constant current Continuity signal controller includes：
Quasi-resonance Continuity signal generator, for being entered according to valley detection signal, original edge voltage clock signal and PFM signals
Row logical operation obtains quasi-resonance turn-on logic signal；
Oscillator, for producing internal clock signal, high frequency limit frequency signal and low frequency limit frequency signal, and will be interior
Portion's clock signal is sent to quasi-resonance Continuity signal generator, and high frequency limit frequency signal and low frequency limit frequency signal are sent
To frequency limit device；
Frequency limit device, for limiting signal according to the high frequency limit frequency signal generation high frequency, according to the low frequency
Limit frequency signal generation low frequency limits signal；
First gate, for limiting signal and low frequency restriction signal according to the quasi-resonance turn-on logic signal, high frequency
Generate the constant current switch Continuity signal.
The high frequency limit frequency signal is 80kHz signals, and low frequency limit frequency signal is 50kHz signals.
The constant current cut-off signals controller includes：
Current-Limiting Comparator, for the primary current amplifier signal and current limliting reference voltage signal to be compared
To current limliting cut-off signals；
Constant current regulator, for obtaining constant current reference voltage signal according to the original edge voltage clock signal；
Constant current comparator, for the primary current amplifier signal and constant current reference voltage signal to be compared
To constant current cut-off signals；
Second gate, opens for the constant current cut-off signals and current limliting cut-off signals being carried out into logical operation obtaining constant current
Close cut-off signals.
The constant current switch driver includes：
Reference current source, for output reference constant current signal；
Rest-set flip-flop, for the constant current Continuity signal and constant current cut-off signals to be carried out into logical operation switching logic is obtained
Control signal；
Constant current driving gate, for generating the switch according to the benchmark constant current signal and the switching logic control signal
Drive signal.
AC/DC changeover switch, including above-mentioned quasi-resonance former limit constant-current control circuit, transformer and switching tube, quasi-resonance is former
Side constant-current control circuit is connected respectively with transformer and switching tube.
The invention has the beneficial effects as follows：The present invention adopts quasi-resonance control technology, can greatly improve fully loaded operating frequency
The efficiency in underloading stage, reduce loss are improved while reducing volume so as to system；Switching tube is turned in zero current, is subtracted significantly
Little electromagnetic interference；Technology is opened using valley point voltage sampling, reduces switching loss, improve system effectiveness；Using former limit it is anti-
Feedback PSR control technologies, former limit can the secondary polygonal voltage of sampling and current signal, reduce peripheral components quantity, reduce system into
Sheet and finished-product volume.
Description of the drawings
Fig. 1 is the structured flowchart of one embodiment of quasi-resonance former limit constant-current control circuit of the present invention；
Fig. 2 is a structured flowchart of sampling detector in quasi-resonance former limit constant-current control circuit of the present invention；
Fig. 3 is a structured flowchart of constant current Continuity signal controller in quasi-resonance former limit constant-current control circuit of the present invention；
Fig. 4 is a structured flowchart of constant current cut-off signals controller in quasi-resonance former limit constant-current control circuit of the present invention；
Fig. 5 is a structured flowchart of constant current switch driver in quasi-resonance former limit constant-current control circuit of the present invention；
Fig. 6 is original edge voltage/current signal and during key switch signal in quasi-resonance former limit constant-current control circuit of the present invention
Sequence figure；
Fig. 7 is the structured flowchart of another embodiment of quasi-resonance former limit constant-current control circuit of the present invention；
In figure, 1- sampling detectors, 101- voltage sampling units, 102- current sampling units, 103- reference voltage sources,
104- voltage amplifiers, 105- current amplifiers, 106- original edge voltage Sequence Detectors, 107- self adaptation oblique wave compensation units,
N101- original edge voltage signals, N102- primary current signals, N103- valley detection signals, N104- original edge voltage clock signals,
N105- primary current amplifier signals, N106- line voltages, N107- voltage amplification reference voltage signals, N108- Current amplifiers
Reference voltage signal, N109- voltage time-series rules reference voltage signals, N110- current limliting reference voltage signals, 2- constant currents conducting letter
Number controller, 201- quasi-resonance Continuity signal generators, 202- oscillators, 203- frequency limit devices, the gates of 204- first,
N201- constant current switch Continuity signals, N202- quasi-resonance turn-on logic signals, N203- internal clock signals, N204- high frequencies are limited
Frequency signal, N205- low frequency limit frequency signals, N206- high frequencies limit signal, and N207- low frequencies limit signal, 3- constant currents shut-off
Signal controller, 301- Current-Limiting Comparators, 302- constant current regulators, 303- constant current comparators, the gates of 304- second, N301-
Constant current switch cut-off signals, N302- current limliting cut-off signals, N303- constant current reference voltage signals, N304- constant current cut-off signals, 4-
Constant current switch driver, 401- reference current sources, 402-RS triggers, 403- constant current driving gates, N401- switching drive signals,
N402- benchmark constant current signals, N403- switching logic control signals, 001- resistance sampling networks, 002- transformers, 003- switches
Pipe, 004- sampling resistors, 005- bridge rectifiers, 006- assists windings, 007-LED light sources, N001- transformer voltage signals,
N002- former limit sampled current signals.
Specific embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
Described below.
As shown in figure 1, for the quasi-resonance former limit constant-current control circuit of AC/DC changeover switch, connecting with AC/DC changeover switch
Connect, the quasi-resonance former limit constant-current control circuit includes sampling detector 1, constant current Continuity signal controller 2, constant current cut-off signals
Controller 3 and constant current switch driver 4.
As shown in Fig. 2 the sampling detector is used to detect line voltage N106 and gather original edge voltage signal N101 and original
Side current signal N102, and the original edge voltage signal N101 and sample detecting when the switching tube of the AC/DC changeover switch is turned off
Voltage amplification reference voltage signal N107 in device is compared and obtains valley detection signal N103 and original edge voltage clock signal
Current amplifier reference voltage in N104, and the primary current signal N102 and sampling detector when the switching tube is turned on
Signal N108 is compared and obtains primary current amplifier signal N105.
The sampling detector includes voltage sampling unit 101, current sampling unit 102, reference voltage source 103, voltage
Amplifier 104, current amplifier 105, original edge voltage Sequence Detector 106 and self adaptation oblique wave compensation unit 107.
The voltage sampling unit 101, for Cycle by Cycle the original edge voltage signal N101 is gathered；Resistance sampling network
The original edge voltage of the transformer 002 of 001 pair of AC/DC changeover switch carries out sampling and obtains transformer voltage signal N001, voltage sample
Unit 101 carries out sampling and obtains original edge voltage signal N101 to transformer voltage signal N001.
Current sampling unit 102, for Cycle by Cycle the primary current signal N102 is gathered；After switching tube 003 is turned on, electricity
Stream flows through sampling resistor 004 and obtains former limit sampled current signals N002, and current sampling unit 102 is to former limit sampled current signals
N002 is acquired and obtains primary current signal N102.
Reference voltage source 103, for producing voltage amplification reference voltage signal N107, Current amplifier reference voltage signal
N108, voltage time-series rules reference voltage signal N109 and current limliting reference voltage signal N110, and by voltage amplification reference voltage
Signal N107 is sent to voltage amplifier 104, and Current amplifier reference voltage signal N108 is sent to current amplifier 105, will
Voltage time-series rules reference voltage signal N109 is sent to original edge voltage Sequence Detector 106, by current limliting reference voltage signal
N110 is sent to constant current Continuity signal controller 2.
Voltage amplifier 104 is used to be amplified the original edge voltage signal N101.
Current amplifier 105 is used to be amplified the primary current signal N102 and obtains primary current sampling and put
Big signal N105.
Original edge voltage Sequence Detector 106, obtains for the original edge voltage signal N101 after amplification to be carried out into logical operation
Valley detection signal N103 and original edge voltage clock signal N104；It is described that the original edge voltage Sequence Detector is additionally operable to generation
PFM signals, and the PFM signals are sent to constant current Continuity signal controller 2.
Self adaptation oblique wave compensation unit 107, for obtaining line voltage N106, and according to the compensation of line voltage N106
Primary current signal N102.
As shown in figure 3, the input signal of the constant current Continuity signal controller 2 is valley detection signal N103, former limit electricity
The PFM signals that pressure clock signal N104 and sampling detector send, the output signal of constant current Continuity signal controller 2 is opened for constant current
Close Continuity signal N201.
The constant current Continuity signal controller 2 includes quasi-resonance Continuity signal generator 201, oscillator 202, frequency limit
The gate 204 of device 203 and first.
The quasi-resonance Continuity signal generator 201 is used for according to valley detection signal N103, original edge voltage clock signal
N104 and PFM signals carry out logical operation and obtain quasi-resonance turn-on logic signal N202.
The oscillator 202 is used to produce internal clock signal N203, high frequency limit frequency signal N204 and low frequency is limited
Frequency signal N205, and internal clock signal N203 is sent to quasi-resonance Continuity signal generator 201, by high frequency limit frequency
Signal N204 and low frequency limit frequency signal N205 are sent to frequency limit device 203；The high frequency limit frequency signal N204 is
80kHz signals, low frequency limit frequency signal N205 is 50kHz signals.
The frequency limit device 203 is used to generate high frequency restriction signal according to the high frequency limit frequency signal N204
N206, generates low frequency and limits signal N207 according to the low frequency limit frequency signal N205.
First gate 204 is used to limit signal N206 according to the quasi-resonance turn-on logic signal N202, high frequency
Signal N207 is limited with low frequency generate the constant current switch Continuity signal N201.
As shown in figure 4, the input signal of the constant current cut-off signals controller 3 is original edge voltage clock signal N104, original
Side current sample amplifies signal N105 and current limliting reference voltage signal N110, and the output signal of constant current cut-off signals controller 3 is
Constant current switch cut-off signals N301.
The constant current cut-off signals controller 3 includes Current-Limiting Comparator 301, constant current regulator 302, constant current comparator 303
With the second gate 304.
Current-Limiting Comparator 301 is used for the primary current amplifier signal N105 and current limliting reference voltage signal N110
It is compared and obtains current limliting cut-off signals N302.
Constant current regulator 302 is used to obtain constant current reference voltage signal according to the original edge voltage clock signal N104
N303。
Constant current comparator 303 is used for the primary current amplifier signal N105 and constant current reference voltage signal N303
It is compared and obtains constant current cut-off signals N304.
Second gate 304 is used to for the constant current cut-off signals N304 and current limliting cut-off signals N302 to carry out logical operation
Obtain constant current switch cut-off signals N301.
As shown in figure 5, the input signal of the constant current switch driver 4 is constant current switch Continuity signal N201 and constant current opening
Cut-off signals N301 is closed, the output signal of constant current switch driver 4 is switching drive signal N401.
The constant current switch driver 4 includes reference current source 401, rest-set flip-flop 402 and constant current driving gate 403.
Reference current source 401 is used for output reference constant current signal N402.
Rest-set flip-flop 402 is obtained for the constant current Continuity signal N201 and constant current cut-off signals N301 to be carried out into logical operation
To switching logic control signal N403.
Constant current driving gate 403 is used to be given birth to according to the benchmark constant current signal N402 and switching logic control signal N403
Into the switching drive signal N401.
Quasi-resonance control technology is adopted in the present invention, primary current is 0, i.e. secondary side electric current when switching tube 003 is turned on
For 0, therefore can obtain：
In formula, Iout is output current, and Ipks is secondary side peak point current, and Tons is secondary side ON time, and Toffs is
The secondary side turn-off time.Because there is following relation in secondary side peak point current Ipks and former limit peak point current Ipk
So obtaining
Because the AC/DC changeover switch adopts peak value comparison method logic, therefore Ipk values are constant in above-mentioned formula, and work as
After application system determines, former limit is also constant with turn ratio Np/Ns of secondary side, therefore only needs to the Ratio invariableness of Tons/Tsw
Iout can be just set to keep constant, therefore the present invention obtains the Tons of current period by original edge voltage clock signal of sampling, and leads to
The Toffs in Tons/Tsw ratio calculations next cycle of constant current regulator determination is crossed, computing draws system constant current reference voltage, defeated
Go out in constant current comparator compare with former limit amplifier current signal to constant current cut-off signals, so as to complete the alternating current-direct current
The constant current function of converter.
Meanwhile, the present invention increases underloading condition control logic on the basis of traditional quasi-resonance mode of operation, former by detecting
Polygonal voltage sequential produces underloading frequency and adjusts (PFM) signal, does not go to open switching tube when there is underload switch Continuity signal
003, and be to continue with going to open switch when there is just being produced when valley detection signal occurs the real Continuity signal of switching tube 003
Pipe 003, so as to realize underloading in the case of the work of frequency reducing quasi-resonance control model, loss will substantially reduce, and compare traditional standard
Resonance control model efficiency has and is obviously improved.
The present invention improves system operating frequency by perfect system design, reduces peripheral components size, while still protecting
High efficiency is held, and due to quasi-resonance control technology, greatly reduces switch electromagnetic interference problem, it is achieved thereby that small size is efficient
The AC/DC changeover switch of rate.
Quasi-resonance former limit constant-current control circuit in the present invention can be realized by a controller.
As shown in fig. 6, can be seen that when primary side current of transformer reaches peak value current-limiting points Ipk from the front half section of waveform,
Switch OFF, system enters the turn-off time, and primary side current of transformer is gradually reduced power tube drain-source voltage simultaneously and is also gradually reduced,
When voltage reaches valley test point, switch is opened, and system enters ON time, and primary side current of transformer is gradually increasing and reaches peak value
Current-limiting points Ipk；And illustrate when PFM detection signals are intervened in the second half section of waveform, it is actual even if detecting trough signal
Trough signal also carries out just effectively being opened after state replacement until PFM detection signals, so as to complete light condition under
Frequency-dropping function.
As shown in fig. 7, an application circuit of the quasi-resonance former limit constant-current control circuit in the present invention includes bridge rectifier
Device 005, the first electric capacity C1, the second electric capacity C2, diode D1, transformer 002, assists winding 006, resistance sampling network 001, electricity
Stream sampling resistor 004, switching tube 003 and LED/light source 007.
Specific work process is as follows, and AC power supplies input rectifying is line voltage N106 by bridge rectifier 005, by switching tube
003 control transformer 002 carries out energy conversion and is supplied to secondary side, while the collection former limit sample rate current of current sampling resistor 004
Signal N002, quasi-resonance former limit constant-current control circuit is acquired to former limit sampled current signals N002 and obtains primary current signal
N102 carries out logical operation, and the sampling real-time voltage of transformer 002 of assists winding 006 obtains transformation by resistance sampling network 001
Device voltage signal N001, quasi-resonance former limit constant-current control circuit is acquired to former limit sampled current signals N002 and obtains former limit electricity
Stream signal N102 carries out logical operation.
The above is only the preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form, is not to be taken as the exclusion to other embodiment, and can be used for various other combinations, modification and environment, and can be at this
In the text contemplated scope, it is modified by the technology or knowledge of above-mentioned teaching or association area.And those skilled in the art are entered
Capable change and change, then all should be in the protection domains of claims of the present invention without departing from the spirit and scope of the present invention
It is interior.
Claims (8)
1. quasi-resonance former limit constant-current control circuit, is arranged in AC/DC changeover switch, it is characterised in that the quasi-resonance former limit is permanent
Flow control circuit includes：
Sampling detector, for detecting line voltage and gathering original edge voltage signal and primary current signal, and by the alternating current-direct current
Original edge voltage signal when the switching tube of converter is turned off is compared with the voltage amplification reference voltage signal in sampling detector
Relatively obtain valley detection signal and original edge voltage clock signal, and the primary current signal and electricity when the switching tube is turned on
Banish big reference voltage signal and be compared and obtain primary current amplifier signal；
Constant current Continuity signal controller, for being sent according to valley detection signal, original edge voltage clock signal and sampling detector
PFM signals carry out logical operation and obtain quasi-resonance turn-on logic signal, and by the quasi-resonance turn-on logic signal and frequency
The signal that limiter sends is compared and obtains constant current switch Continuity signal；
Constant current cut-off signals controller, for being sent out according to the primary current amplifier signal and constant current Continuity signal controller
The current limliting reference voltage signal for going out obtains current limliting cut-off signals, and according to the original edge voltage clock signal constant current reference voltage is obtained
Signal, the primary current amplifier signal and constant current reference voltage signal are compared and obtain constant current cut-off signals, and root
Constant current switch cut-off signals are generated according to constant current cut-off signals and current limliting cut-off signals；
Constant current switch driver, for being generated for driving according to the constant current switch Continuity signal and constant current switch cut-off signals
The switching drive signal of the switching tube.
2. quasi-resonance former limit constant-current control circuit according to claim 1, it is characterised in that the sampling detector bag
Include：
Voltage sampling unit, for Cycle by Cycle the original edge voltage signal is gathered；
Current sampling unit, for Cycle by Cycle the primary current signal is gathered；
Reference voltage source, for producing voltage amplification reference voltage signal, Current amplifier reference voltage signal, voltage time-series rules
Reference voltage signal and current limliting reference voltage signal, and voltage amplification reference voltage signal is sent to voltage amplifier, by electricity
Banish big reference voltage signal to send to current amplifier, when voltage time-series rules reference voltage signal is sent to original edge voltage
Sequence detector, current limliting reference voltage signal is sent to constant current Continuity signal controller；
Voltage amplifier, for being amplified to the original edge voltage signal；
Current amplifier, for being amplified to the primary current signal primary current amplifier signal is obtained；
Original edge voltage Sequence Detector, for the original edge voltage signal after amplification to be carried out into logical operation valley detection signal is obtained
And original edge voltage clock signal；
Self adaptation oblique wave compensation unit, for obtaining the line voltage, and the primary current signal according to line voltage compensation.
3. quasi-resonance former limit constant-current control circuit according to claim 2, it is characterised in that the original edge voltage sequential inspection
Surveying device is used to produce the PFM signals, and the PFM signals are sent to constant current Continuity signal controller.
4. quasi-resonance former limit constant-current control circuit according to claim 1, it is characterised in that the constant current Continuity signal control
Device processed includes：
Quasi-resonance Continuity signal generator, for being patrolled according to valley detection signal, original edge voltage clock signal and PFM signals
Collect computing and obtain quasi-resonance turn-on logic signal；
Oscillator, for producing internal clock signal, high frequency limit frequency signal and low frequency limit frequency signal, and during by inside
Clock signal is sent to quasi-resonance Continuity signal generator, and high frequency limit frequency signal and low frequency limit frequency signal are sent to frequency
Rate limiter；
Frequency limit device, for limiting signal according to the high frequency limit frequency signal generation high frequency, limits according to the low frequency
Frequency signal generates low frequency and limits signal；
First gate, for limiting signal and low frequency restriction signal generation according to the quasi-resonance turn-on logic signal, high frequency
The constant current switch Continuity signal.
5. quasi-resonance former limit constant-current control circuit according to claim 4, it is characterised in that the high frequency limit frequency letter
Number be 80kHz signals, low frequency limit frequency signal be 50kHz signals.
6. quasi-resonance former limit constant-current control circuit according to claim 1, it is characterised in that the constant current cut-off signals control
Device processed includes：
Current-Limiting Comparator, for the primary current amplifier signal and current limliting reference voltage signal to be compared and be limited
Stream cut-off signals；
Constant current regulator, for obtaining constant current reference voltage signal according to the original edge voltage clock signal；
Constant current comparator, for the primary current amplifier signal and constant current reference voltage signal to be compared and obtain perseverance
Stream cut-off signals；
Second gate, for the constant current cut-off signals and current limliting cut-off signals to be carried out into logical operation constant current switch pass is obtained
Break signal.
7. quasi-resonance former limit constant-current control circuit according to claim 1, it is characterised in that the constant current switch driver
Including：
Reference current source, for output reference constant current signal；
Rest-set flip-flop, for the constant current Continuity signal and constant current cut-off signals to be carried out into logical operation switching logic control is obtained
Signal；
Constant current driving gate, for generating the switch drive according to the benchmark constant current signal and the switching logic control signal
Signal.
8. AC/DC changeover switch, it is characterised in that include the quasi-resonance former limit current constant control as described in claim 1～7 is arbitrary
Circuit, transformer and switching tube, quasi-resonance former limit constant-current control circuit is connected respectively with transformer and switching tube.
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| CN201610875674.5A CN106655834B (en) | 2016-10-08 | 2016-10-08 | Quasi-resonance primary side constant-current control circuit and AC/DC changeover switch with the circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107070206A (en) * | 2017-05-22 | 2017-08-18 | 电子科技大学 | A kind of quasi-resonant switching converter detected based on valley |
| CN108449840A (en) * | 2018-04-26 | 2018-08-24 | 深圳市立智达光电科技有限公司 | A kind of LED drive system |
| CN108599594A (en) * | 2018-04-03 | 2018-09-28 | 西安电子科技大学 | A kind of AC-DC Isobarically Controls converter |
| CN110380629A (en) * | 2019-06-04 | 2019-10-25 | 深圳市稳先微电子有限公司 | Primary side feedback exchanges the quasi-resonance control circuit and device for turning direct-current switch power supply |
| CN110780107A (en) * | 2019-11-29 | 2020-02-11 | 杭州富阳中恒电气有限公司 | Current sampling control method and device for three-phase converter, electronic equipment and medium |
| CN112098708A (en) * | 2020-11-23 | 2020-12-18 | 成都市易冲半导体有限公司 | Line voltage information detection circuit and detection method for secondary side PD controller |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102802317A (en) * | 2012-08-28 | 2012-11-28 | 成都启臣微电子有限公司 | Adjusting device of LED (Light-Emitting Diode) light source |
| CN103079316A (en) * | 2013-01-08 | 2013-05-01 | 成都启臣微电子有限公司 | LED (Light-Emitting Diode) lighting power supply controller on basis of power factor correction and primary side feedback control |
| CN203618195U (en) * | 2013-12-24 | 2014-05-28 | 杭州士兰微电子股份有限公司 | Isolated type primary-side feedback LED drive circuit having PFC and controller thereof |
| CN105262333A (en) * | 2015-12-02 | 2016-01-20 | 成都启臣微电子有限公司 | Quasi-resonance fly-back type controller and control method |
-
2016
- 2016-10-08 CN CN201610875674.5A patent/CN106655834B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102802317A (en) * | 2012-08-28 | 2012-11-28 | 成都启臣微电子有限公司 | Adjusting device of LED (Light-Emitting Diode) light source |
| CN103079316A (en) * | 2013-01-08 | 2013-05-01 | 成都启臣微电子有限公司 | LED (Light-Emitting Diode) lighting power supply controller on basis of power factor correction and primary side feedback control |
| CN203618195U (en) * | 2013-12-24 | 2014-05-28 | 杭州士兰微电子股份有限公司 | Isolated type primary-side feedback LED drive circuit having PFC and controller thereof |
| CN105262333A (en) * | 2015-12-02 | 2016-01-20 | 成都启臣微电子有限公司 | Quasi-resonance fly-back type controller and control method |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107070206A (en) * | 2017-05-22 | 2017-08-18 | 电子科技大学 | A kind of quasi-resonant switching converter detected based on valley |
| CN108599594A (en) * | 2018-04-03 | 2018-09-28 | 西安电子科技大学 | A kind of AC-DC Isobarically Controls converter |
| CN108449840A (en) * | 2018-04-26 | 2018-08-24 | 深圳市立智达光电科技有限公司 | A kind of LED drive system |
| CN110380629A (en) * | 2019-06-04 | 2019-10-25 | 深圳市稳先微电子有限公司 | Primary side feedback exchanges the quasi-resonance control circuit and device for turning direct-current switch power supply |
| CN110780107A (en) * | 2019-11-29 | 2020-02-11 | 杭州富阳中恒电气有限公司 | Current sampling control method and device for three-phase converter, electronic equipment and medium |
| CN110780107B (en) * | 2019-11-29 | 2022-03-22 | 杭州富阳中恒电气有限公司 | Current sampling control method and device for three-phase converter, electronic equipment and medium |
| CN112098708A (en) * | 2020-11-23 | 2020-12-18 | 成都市易冲半导体有限公司 | Line voltage information detection circuit and detection method for secondary side PD controller |
| CN112098708B (en) * | 2020-11-23 | 2021-02-02 | 成都市易冲半导体有限公司 | Line voltage information detection circuit and detection method for secondary side PD controller |
| CN112803722A (en) * | 2020-12-31 | 2021-05-14 | 成都芯源系统有限公司 | Isolated switch converter and controller and control method thereof |
| CN117310262A (en) * | 2023-11-28 | 2023-12-29 | 成都市易冲半导体有限公司 | Primary side information detection circuit and detection chip of transformer |
| CN117310262B (en) * | 2023-11-28 | 2024-02-09 | 成都市易冲半导体有限公司 | Primary side information detection circuit and detection chip of transformer |
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