CN105743346B - System and method for the output current regulation in power converting system - Google Patents

System and method for the output current regulation in power converting system Download PDF

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Publication number
CN105743346B
CN105743346B CN201610177276.6A CN201610177276A CN105743346B CN 105743346 B CN105743346 B CN 105743346B CN 201610177276 A CN201610177276 A CN 201610177276A CN 105743346 B CN105743346 B CN 105743346B
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signal
terminal
switch
transistor
diode
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CN105743346A (en
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方烈义
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Guangzhou On Bright Electronics Co Ltd
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Guangzhou On Bright Electronics Co Ltd
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Priority claimed from CN201410166772.2A external-priority patent/CN103956900B/en
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • 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
    • H02M7/2176—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 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output

Abstract

The present invention provides the system and method for the output current regulation in power converting system.A kind of example system controller includes: detection components, which is configured to receive input voltage relevant to the diode for being connected to inductor, and is greater than predetermined threshold in response to input voltage, exports the first signal with the first logic level；Control logic component, the control logic component are configured to receive the first signal, handle information associated with the first signal, and be in the first logic level in response to the first signal, export modulated signal relevant to modulating frequency；And driving assembly, which is configured to receive modulated signal, and first switch is opened or closed with modulating frequency in output drive signal.

Description

System and method for the output current regulation in power converting system
Divisional application explanation
The application be the applying date be on April 23rd, 2014, application No. is 201410166772.2, entitled " become for power supply The divisional application of the Chinese invention patent application of the system and method for changing the output current regulation in system ".
Technical field
Certain embodiments of the present invention is related to integrated circuit.It is used for more specifically, some embodiments of the present invention provide The system and method for exporting current regulation.Only as an example, some embodiments of the present invention have been applied to power converting system. It is to be understood that the present invention has the wider scope of application.
Background technique
Fig. 1 is the simplification figure with primary side sensing and the conventional buck of adjusting (buck) power converting system.System 100 Including system controller 102, resistor 118,164 and 192, capacitor 108,142 and 124, power switch 130, inductor 120, diode 122 and multiple LED 198.In addition, system controller 102 includes terminal 140,144,146,148 and 154.
Mains (AC) input 110 (for example, VAC) and are provided to input terminal 112 and 114.For example, system controls Device 102, which is received, to be inputted 110 relevant input signals to exchange (AC) and generates signal 194 to influence switch 130.Work as switch 130 when being closed (for example, being switched on), and inductor 120 is magnetized, and electric current 190 flows through switch 130 and resistor 164. System controller 102 detects current sensing signal 106 at terminal 146 (for example, terminal CS).When switch 130 is disconnected (example Such as, it is turned off) when, inductor 120 is demagnetized, and electric current 192 flows through diode 122, capacitor 124 and multiple LED 198.The output electric current 188 for flowing through multiple LED 198 is approximately equal to the average current for flowing through inductor 120.If flowing through inductance The average current of device 120 is adjusted to predetermined value, then the output electric current 188 for flowing through multiple LED 198 is adjusted to approximately constant In predetermined value.For example, output electric current 188 is by sensing the electric current 190 by resistor 164 and calculating and inductor 120 What the associated demagnetization period was estimated.Terminal 148 is offset to ground voltage 104.But normal power supplies transformation system 100 have some unfavorable conditions.
Therefore, it is modified to adjust the technology of the output electric current of power converting system to be in demand.
Summary of the invention
Certain embodiments of the present invention is related to integrated circuit.It is used for more specifically, some embodiments of the present invention provide The system and method for exporting current regulation.Only as an example, some embodiments of the present invention have been applied to power converting system. It is to be understood that the present invention has the wider scope of application.
According to one embodiment, a kind of system controller for adjusting power converting system includes: detection components, the inspection It surveys component to be configured to receive input voltage relevant to the diode for being connected to inductor, and is greater than in response to output voltage Predetermined threshold exports the first signal with the first logic level；Control logic component, the control logic component are configured to receive One signal handles information associated with the first signal, and is in the first logic level, output and tune in response to the first signal The modulated signal of frequency dependence processed；And driving assembly, the driving assembly are configured to receive modulated signal, and output driving First switch is opened or closed with modulating frequency in signal, to be closed in response to first switch, inductor is configured to lead to It crosses the switch and exports the first electric current, and be disconnected in response to first switch, inductor is configured to export the by diode Two electric currents.
According to another embodiment, a kind of system controller for adjusting power converting system includes: the first transistor, should The first transistor includes the first transistor terminal, second transistor terminal and third transistor terminal, the first transistor terminal quilt It is coupled to the 4th transistor terminal of second transistor, second transistor further includes the 5th transistor terminal and the 6th crystal pipe end Son.5th transistor terminal is coupled to the first resistor device terminal of first resistor device, and first resistor device further includes second resistance Device terminal.5th transistor terminal is coupled to the first diode terminal of first diode, and first diode further includes second Diode terminal.Second diode terminal is coupled to second resistor terminal.System controller is configured to change the 4th crystalline substance The first voltage of body pipe end is to turn on and off second transistor, and to influence to flow through the electric current of inductor.
According to yet another embodiment, a kind of system controller for adjusting power converting system includes: sampling component, this is adopted Sample component is configured to that one or more peak values of current sensing signal are sampled or detected, and is at least based on and electric current The associated information of one or more peak values for being sampled or being detected of sensing signal generates output signal, current sense letter It is number associated with the first electric current of switch is flowed through from inductor；Error amplifier, the error amplifier are configured to receive output Signal and reference signal, and amplified signal is at least generated based on information associated with output signal and reference signal；Than Compared with device, which is configured to receive current sensing signal and the first signal associated with amplified signal, and at least base Comparison signal is exported in associated with the first signal and current sensing signal information；And control and driving assembly, the control System is configured to receive comparison signal with driving assembly, and at least based on information associated with comparison signal come output driving Signal is switched with closing or opening to control or influence the first electric current.
According to yet another embodiment, a kind of system controller for adjusting power converting system includes: protection component, the guarantor Protecting assembly is configured to receive the first signal and the second signal, and at least based on associated with the first signal and the second signal Information generates third signal, the first signal to and inductor relevant demagnetization period it is associated, second signal and flow through inductance First electric current of device is associated；And control and driving assembly, the control and driving assembly are configured to receive third signal, and And to switch output drive signal to influence the first electric current.Protection component be further configured in response to second signal indicate with drive The first electric current is equal to or more than current threshold and the first signal designation the during the dynamic signal associated first switch period The period is demagnetized less than predetermined amount of time during the turn-off time section of one switch periods, and third signal is changed from the first signal condition It is second signal state to cause power converting system to be closed.
In one embodiment, a kind of method for adjusting power converting system includes: to receive and be connected to inductor The relevant input voltage of diode；Handle information associated with input signal；It is greater than predetermined threshold in response to input voltage, The first signal is exported with the first logic level；Receive the first signal；And processing information associated with the first signal.This method Further include: it is in the first logic level in response to the first signal, exports modulated signal relevant to modulating frequency；Receive modulation letter Number；And processing information associated with modulated signal.In addition, this method comprises: output drive signal is disconnected with modulating frequency Or closure first switch；It is closed in response to first switch, the first electric current is exported by the switch；And in response to first switch It is disconnected, the second electric current is exported by diode.
In another embodiment, a kind of method for adjusting power converting system includes: one to current sensing signal A or multiple peak values are sampled or are detected, and the current sensing signal is associated with the first electric current of switch is flowed through from inductor； Output letter is at least generated based on information associated with the one or more peak values for being sampled or being detected of current sensing signal Number；Receive the output signal and reference signal；And handle information associated with output signal and reference signal.This method is also It include: that amplified signal is at least generated based on information associated with output signal and reference signal；Receive current sensing signal Associated first signal with amplified signal；Handle information associated with current sensing signal and the first signal；And extremely It is few that comparison signal is exported based on information associated with the first signal and current sensing signal.In addition, this method comprises: receiving Comparison signal；Handle information associated with comparison signal；And it is at least exported based on information associated with comparison signal Driving signal switchs to control or influence first electric current with closing or opening.
In another embodiment, a kind of method for adjusting power converting system includes: to receive the first signal and second Signal；Handle information associated with the first signal and the second signal；And it is at least based on and the first signal and the second signal phase Associated information generates third signal, the first signal to and inductor relevant demagnetization period it is associated, second signal and stream The first electric current through inductor is associated.This method further include: receive third signal；Handle letter associated with third signal Breath；To switch output drive signal to control or influence the first electric current；And in response to second signal instruction with driving signal The first electric current is equal to or more than current threshold and the first signal designation in first switch during the associated first switch period The period is demagnetized less than predetermined amount of time during the turn-off time section in period, and third signal is changed into second from the first signal condition Signal condition is so that the power converting system is closed.
One or more beneficial effects may be implemented according to embodiment.It can be comprehensive with reference to specific descriptions below and attached drawing Ground understands these beneficial effects and various additional purposes, feature and advantage of the invention.
Detailed description of the invention
Fig. 1 is the simplification figure of the routine floating ground voltage dropping power supply transformation system of the sensing and adjusting with primary side.
Fig. 2 is the simplification figure for showing the power converting system of embodiment according to the present invention.
Fig. 3 is the simplified timing diagram for showing the power converting system as shown in Figure 2 of embodiment according to the present invention.
Fig. 4 is the simplification figure for showing power converting system according to another embodiment of the present invention.
Fig. 5 is the simplification figure for showing power converting system according to still another embodiment of the invention.
Fig. 6 is the simplification figure for showing power converting system according to still another embodiment of the invention.
Fig. 7 is the simplification figure for showing power converting system according to still another embodiment of the invention.
Fig. 8 is shown according to some embodiments of the present invention such as Fig. 2, Fig. 4, Fig. 6 and/or power conversion shown in fig. 7 The simplified timing diagram of the demagnetization detection of system.
Fig. 9 is shown according to some embodiments of the present invention such as Fig. 2, Fig. 4, Fig. 6 and/or shown in fig. 7 as power supply The simplification figure of certain components of the demagnetization detector of a part of transformation system.
Specific embodiment
Certain embodiments of the present invention is related to integrated circuit.It is used for more specifically, some embodiments of the present invention provide The system and method for exporting current regulation.Only as an example, certain embodiments of the present invention has been applied to power converting system. It is to be understood that the present invention has the wider scope of application.
Fig. 2 is the simplification figure for showing the power converting system of embodiment according to the present invention.The figure is only example, no The scope of the claims should exceedingly be limited.Many changes, substitutions and modifications will be recognized in those skilled in the art.
System 200 includes system controller 202, resistor 208,209,218,236 and 267, full-wave rectification bridge 213, electricity Container 224,234 and 242, switch 230, inductor 220, diode 222 and 238 and multiple LED 298.System controller 202 include switch 232, diode 250, voltage clamping 252, reference generator 258, input voltage detector 260, Enabled (enable) controller 262, demagnetize detector 264, valley detection device (valley detector) 266, control logic Component 268, comparator 270, driving assembly 272, summation component 274, height inputting line voltage compensation component (high-low- Input-line-voltage-compensation component) 276 and lead-edge-blanking (1eading edge Blanking, LEB) component 278.In addition, system controller 202 includes terminal 231,240,246,248 and 254.For example, switch 230 include transistor (for example, field-effect tube, insulated gate bipolar transistor or bipolar junction transistor).In another example, it opens Closing 232 includes transistor (for example, field-effect tube, insulated gate bipolar transistor or bipolar junction transistor).In another example, Terminal 248 (for example, terminal GND) is offset to ground voltage 204 (for example, chip).In another example, resistor 236 and diode 238 be configured to adjust the ON/OFF speed of switch 230.As an example, when switch 230 is switched on or closes When disconnected, voltage associated with the gate terminal of switch 230 is non-constant during the transition period (transient period) 's.As another example, the grid during period before or after switch 230 is switched on or turns off for a long time, with switch 230 The extreme associated voltage of son is constant.
According to one embodiment, AC input 210 (for example, VAC) is provided at input terminal 212 and 214, and whole Stream bridge 213 is configured to provide the input voltage 201 after rectification together with capacitor 242 (for example, Vbus, abbreviation input voltage). For example, input voltage 201 is (for example, Vbus) handled by the divider including resistor 208 and 209, and system controller 202 In terminal 254 (for example, terminal Vin) at receive input signal 219.In another example, input voltage detector 260 receives defeated Enter signal 219 and to control logic component 268 generate signal 281 262 output signal 280 of enabled controller.Another In example, control logic component 268 exports modulated signal 282 to driving assembly 272, which generates driving signal 283 to control or influence switch 232.
According to another embodiment, switch 232 is connect with switch 230 in the form of cascade (Cascode).For example, switch 232 It is closed or disconnects to switch for power.In another example, in the connection of switch periods associated with driving signal 283 During period, switch 232 is closed (for example, being switched on).In another example, the node between switch 230 and 232 The amplitude of (for example, node SW) associated voltage signal 284 declines (reducing on magnitude), and in response, switch 230 It is closed (for example, being switched on).In another example, inductor 220 is magnetized, and electric current 290 flows through switch 230 and is System controller 202 receives at terminal 231.In another example, the node between switch 230 and inductor 220 is associated Voltage 237 reduce on magnitude.In another example, voltage signal 206 associated with resistor 267 is controlled by system Device 202 detects at terminal 246 (for example, terminal CS), and LEB component 278 receives signal 206 and defeated to comparator 270 Current sensing signal 277 out.In another example, in section phase turn-off time of switch periods associated with driving signal 283 Between, switch 232 is disconnected (for example, being turned off).In another example, the amplitude rising of voltage signal 284 (increases on magnitude Add), and in response, switch 230 is disconnected (for example, being turned off).In another example, inductor 220 is demagnetized, and Electric current 292 flows through diode 222, capacitor 224 and multiple LED 298.In another example, the amplitude of signal 237 rises (increasing on magnitude, for example, becoming close to voltage 201).In another example, the output electric current 288 of multiple LED 298 is flowed through It is associated with the average current that (for example, being equal to) flow through inductor 220.In another example, if flowing through being averaged for inductor 220 Electric current is adjusted to predetermined value, then the output electric current 288 for flowing through multiple LED 298 is adjusted to approximately constant in predetermined value.
According to yet another embodiment, signal 284 associated with the node SW between switch 230 and 232 is detected by demagnetization Device 264 receives, which is configured to determine the demagnetization period associated with inductor 220.For example, trough is examined It surveys device 266 and receives detection signal 285 from demagnetization detector 264, and to 268 output signal 286 of control logic component.As showing Example, valley detection device 266 detects the first trough occurred in signal 284 and changes signal 286, to make driving signal Occur rising edge in 283 and starts the connection period of switch periods associated with driving signal 283.For example, being at least based on Information associated with signal 206 and demagnetization period associated with inductor 220 are estimated to export electric current 288.
In one embodiment, during the start-up course of system 200, capacitor 234 is in response to 201 (example of voltage signal Such as, pass through resistor 218) it is electrically charged, and the amplitude of voltage signal 235 rises (increasing on magnitude).For example, if electricity Pressure 235, which rises, becomes larger than starting threshold voltage, then controller 202 brings into operation.As an example, related to voltage signal 201 (for example, proportional) signal 219 be entered voltage detector 260 and sense.In another example, if voltage signal 201 Less than predetermined threshold, then input voltage detector 260 is with the first logic level (for example, 0) output signal 280, and if electricity Signal 201 is pressed to be greater than predetermined threshold, then input voltage detector 260 is with the second logic level (for example, 1) output signal 280.? In another example, if input voltage detector 260 changes signal 280 to the second logic from the first logic level (for example, 0) Level (for example, 1) then enables controller 262 and changes signal 281 (for example, to logic high), to make control logic component 268 export modulated signals 282 to turn on and off switch 232 with modulating frequency, thus run system 200 normally, LED light 298 is lit.Thereafter, signal 281 will not be changed in response to signal 280 by enabling controller 262.In some embodiments In, voltage signal 201 is entered always the sensing of voltage detector 260 during the operation of system 200.In other embodiments, Voltage signal 201 only during start-up course and subsequent is entered voltage detector 260 in one section of short time and senses.
In another embodiment, when switch 232 is disconnected (for example, being turned off), voltage 237 is disconnected in switch 232 After immediately begin to amplitude rise (increasing on magnitude).For example, switch 230, inductor 220 and associated parasitic capacitance Start to vibrate.In another example, one or more spikes (spike) begin to appear in and between switch 230 and switch 232 The associated signal 284 of node (for example, node SW) in.In another example, if one or more spike ratios and voltage Clamper 252 (for example, Zener diode) associated clamping voltag adds forward voltage associated with diode 250 more Greatly, then the spike is absorbed by diode 250 by capacitor 234 and voltage clamping 252.In another example, one or Multiple spikes provide supply charge or electric current to capacitor 234 to pass through terminal 240 (for example, terminal VCC) to controller 202 The service voltage of all internal circuits for controller 202 is provided.In another example, summation component 274 receives benchmark letter Numbers 273 and thermal compensation signal 271 is received from height inputting line voltage compensation component 276, and export threshold signal 275 to than Compared with device 270, which exports comparison signal 299.In another example, if comparison signal 299 is from the first logic level (for example, 1) changes to the second logic level (for example, 0), and indicator current sensing signal 277 becomes larger than threshold value on magnitude Signal 275, then occurring failing edge in driving signal 283, and the connection of switch periods associated with driving signal 283 Period terminates.In another example, if the voltage of inputting line voltage (for example, signal 201) is high (having big magnitude), The amplitude of signal 271 is low (to have small magnitude, for example, 0).In another example, if inputting line voltage is (for example, signal 201) voltage is low (having small magnitude), then the amplitude of signal 271 is high (having big magnitude).That is the amount of voltage signal 201 Value has the relationship of inverse ratio with the amplitude of signal 271.
Fig. 3 is the simplification timing for showing the power converting system as shown in Figure 2 200 of embodiment according to the present invention Figure.The figure is only example, should not exceedingly limit the scope of the claims.Those skilled in the art will recognize that To many changes, substitutions and modifications.It is run at discontinuous conduction mode (DCM) for example, waveform 302,304 and 306 is described Power converting system 200 certain operations.Waveform 302 indicates the signal of the function as the time associated with node SW 284, waveform 304 indicates that flowing through the electric current 292 of the function as the time of inductor 220 and waveform 306 indicated as the time Function current sensing signal 277.In some embodiments, waveform 302 indicates and between switch 230 and inductor 220 Associated, as the time the function of node voltage 237.
According to one embodiment, (for example, in t during the turn-on time section of switch 2320And t1Between), signal 284 has There is low magnitude 318 (for example, zero), as shown in waveform 302.For example, electric current 292 increases to 312 (example of peak value from magnitude 310 Such as, as shown in waveform 304), and current sensing signal 277 increases to magnitude 316 (for example, such as by waveform from magnitude 314 Shown in 306).In another example, in t1Place, switch 232 is disconnected (for example, being turned off), and inductor 220 starts to move back Magnetic.In another example, signal 284 increases to magnitude 320 from magnitude 318, and is maintained at magnitude 320 until inductor 220 demagnetization period terminates (for example, in t2The A at place), as shown in waveform 302.In another example, in demagnetization phase period Between, electric current 292 is from peak value 312 (for example, in t1Place) be decreased to magnitude 322 (for example, as shown in waveform 304 in t2Place).? In another example, in t1Place, current sensing signal 277 is decreased to magnitude 324 from magnitude 316, and protects during the period of demagnetizing (for example, as shown in waveform 306) is held at magnitude 324.In another example, after the period of demagnetizing, signal 284 is from amount Value 320 is (for example, in t2Place) it is decreased to magnitude 326 (for example, B is in t3Place), wherein magnitude 326 corresponds to and appears in signal 284 The first valley value.
According to another embodiment, the average current 308 for flowing through inductor 220 is determined by following equation:
Wherein IL_avg indicates average current 308, and IL_P indicates the peak value 312 of electric current 292.As an example, peak value 312 are determined by following equation:
Wherein V_th indicates threshold signal 275, and RsIndicate resistor 267.In conjunction with equation 1 and equation 2, inductance is flowed through The average current 308 of device 220 is determined by following equation:
Fig. 4 is the simplification figure for showing power converting system according to another embodiment of the present invention.The figure is only example, It should not exceedingly limit the scope of the claims.Those skilled in the art will be recognized it is many change, replacement and Modification.
System 400 includes system controller 402, resistor 408,409,418 and 467, full-wave rectification bridge 413, capacitor 424,434 and 442, inductor 420, diode 422 and multiple LED 498.System controller 402 includes 430 He of switch 432, diode 438 and 450, resistor 436, voltage clamping 452, reference generator 458, input voltage detector 460, controller 462 is enabled, demagnetize detector 464, valley detection device 466, control logic component 468, comparator 470, driving Component 472, summation component 474, height inputting line voltage compensation component 476 and lead-edge-blanking (LEB) component 478.In addition, being Controller 402 of uniting includes terminal 431,440,446,448 and 454.For example, switch 430 includes transistor (for example, field-effect Pipe, insulated gate bipolar transistor or bipolar junction transistor).In another example, switch 432 includes transistor (for example, field is imitated Ying Guan, insulated gate bipolar transistor or bipolar junction transistor).
In some embodiments, resistor 408,409,418 and 467, full-wave rectification bridge 413, capacitor 424,434 and 442, inductor 420 and diode 422 respectively with resistor 208,209,218 and 267, full-wave rectification bridge 213, capacitor 224,234 and 242, inductor 220 and diode 222 are identical.In certain embodiments, switch 430 and 432, diode 438 and 450, resistor 436, voltage clamping 452, reference generator 458, input voltage detector 460, enabled control Device 462 processed, demagnetize detector 464, valley detection device 466, control logic component 468, comparator 470, and driving assembly 472 is asked With component 474, height inputting line voltage compensation component 476 and LEB component 478 respectively with switch 230 and 232, diode 238 With 250, resistor 236, voltage clamping 252, reference generator 258, input voltage detector 260 enables controller 262, demagnetize detector 264, valley detection device 266, control logic component 268, comparator 270, driving assembly 272, summation group Part 274, height inputting line voltage compensation component 276 and LEB component 278 are identical.In some embodiments, system 400 executes Operation similar with system 200.
Fig. 5 is the simplification figure for showing power converting system according to still another embodiment of the invention.The figure is only example, It should not exceedingly limit the scope of the claims.Those skilled in the art will be recognized it is many change, replacement and Modification.
System 1400 includes system controller 1402, resistor 1418 and 1467, full-wave rectification bridge 1413, capacitor 1424,1434 and 1442, inductor 1420, diode 1422 and multiple LED 1498.System controller 1402 includes switch 1430 and 1432, diode 1438 and 1450, voltage clamping 1452, reference generator 1458, timing comparing component 1460, overvoltage protection (OVP) component 1462, demagnetize detector 1464, maximum turn-on time component 1465, valley detection device 1466, control logic component 1468, comparator 1470, driving assembly 1472, summation component 1474, the compensation of height inputting line voltage Component 1476 and LEB component 1478.In addition, system controller 1402 includes terminal 1431,1440,1446 and 1448.For example, Switch 1430 includes transistor (for example, field-effect tube, insulated gate bipolar transistor or bipolar junction transistor).Show another In example, switch 1432 includes transistor (for example, field-effect tube, insulated gate bipolar transistor or bipolar junction transistor).Another In one example, terminal 1448 (for example, terminal GND) is offset to ground voltage 1404 (for example, chip).In another example In, resistor 1436 and diode 1438 are configured to adjust the ON/OFF speed of switch 1430.As an example, when switch 1430 when being switched on or turning off, and voltage associated with the gate terminal of switch 1430 is non-constant.As another example, exist Before or after switch 1430 is switched on or turns off for a long time, voltage associated with the gate terminal of switch 1430 is approximately constant 's.
According to one embodiment, AC input 1410 (for example, VAC) is provided at input terminal 1412 and 1414, and Rectifier bridge 1413 is configured to provide voltage 1401 together with capacitor 1442 (for example, Vbus).For example, control logic component 1468 export modulated signal 1482 (for example, pulse to influence the driving assembly 1472 of switch 1432 to driving signal 1483 is generated Bandwidth modulation signals).In another example, switch 1432 is connect in the form of cascade with switch 1430.In another example, it opens 1432 are closed to be closed or disconnect to switch for power.In another example, during the turn-on time section of switch 1432, switch 1432 are closed (for example, being switched on).In another example, with the node between switch 1430 and 1432 (for example, node SW) amplitude of associated signal 1484 declines (reducing on magnitude), and in response, switch 1430 be closed (for example, It is switched on).In another example, inductor 1420 is magnetized, and electric current 1490 flows through switch 1430 and by system controller 1402 receive at terminal 1431.In another example, associated with the node between switch 1430 and inductor 1420 The amplitude of voltage 1437 declines (reducing on magnitude).In another example, voltage signal associated with resistor 1467 1406 are detected at terminal 1446 (for example, terminal CS) by system controller 1402, and LEB component 1478 receives signal 1406 and to comparator 1470 export current sensing signal 1477.In another example, associated with driving signal 1483 During the turn-off time section of switch periods, switch 1432 is disconnected (for example, being turned off).In another example, signal 1484 Amplitude rises (increasing on magnitude), and in response, switch 1430 is disconnected (for example, being turned off).In another example, Inductor 1420 is demagnetized, and electric current 1492 flows through inductor 1420.As an example, electric current 1492 flows through diode 1422 simultaneously And it is provided to capacitor 1424 and multiple LED 1498.In another example, signal 1437 increases on magnitude (for example, becoming It obtains close to voltage 1401).In another example, it flows through the output electric current 1488 of multiple LED 1498 and flows through inductor 1420 Average current be associated (for example, being equal to).In another example, if the average current for flowing through inductor 1420 is adjusted to Predetermined value, then the output electric current 1488 for flowing through multiple LED 1498 are adjusted to approximately constant in predetermined value.
According to another embodiment, signal 1484 associated with the node SW between switch 1430 and 1432 is examined by demagnetization It surveys device 1464 to receive, which is configured to determine the demagnetization period associated with inductor 1420.For example, wave Valley detector 1466 receives detection signal 1485 from demagnetization detector 1464, and to 1468 output signal of control logic component 1486.As an example, valley detection device 1466 detects the first trough occurred in signal 1484 and changes signal 1486, from And make occur rising edge in driving signal 1483, and start the turn-on time of switch periods associated with driving signal 1483 Section.For example, at least defeated to estimate based on information associated with signal 1406 and demagnetization period associated with inductor 1420 Electric current 1488 out.
According to yet another embodiment, during the start-up course of system 1400, capacitor 1434 is in response to voltage signal 1401 (for example, passing through resistor 1418) is electrically charged, and the amplitude of voltage 1435 rises (increasing on magnitude).For example, if Voltage 1435 becomes larger than starting threshold voltage, then controller 1402 brings into operation.In another example, when switch 1432 is broken When opening (for example, being turned off), voltage signal 1437 immediately begins to amplitude after switch 1432 is disconnected and rises and (increase magnitude). As an example, switch 1430, inductor 1420 and associated parasitic capacitance start to vibrate.In another example, one or Multiple spikes begin to appear in the associated signal 1484 of the node (for example, node SW) between switch 1430 and switch 1432 In.In another example, if one or more spikes are greater than associated with voltage clamping 1452 (for example, Zener diode) Clamping voltag add forward voltage associated with diode 1450, then the spike by diode 1450 by capacitor 1434 It is absorbed with voltage clamping 1452.In another example, one or more spikes provide supply charge or electricity to capacitor 1434 Stream is to provide service voltage to controller 1402 by terminal 1440 (for example, terminal VCC).In another example, controller 1402 all internal circuits obtain power supply by terminal 1440 (for example, terminal VCC).In another example, summation component 1474 receive reference signal 1473 and receive thermal compensation signal 1471 from height inputting line voltage compensation component 1476, and export Threshold signal 1475 is to comparator 1470, and wherein comparator 1470 exports comparison signal 1499.In another example, if input Line voltage (for example, signal 1401) has greater magnitude, then signal 1471 has lesser magnitude (for example, 0).Another In example, if inputting line voltage (for example, signal 1401) has lesser magnitude, signal 1471 has greater magnitude. In another example, if comparison signal 1499 from the first logic level (for example, 1) change to the second logic level (for example, 0), the amplitude (magnitude) of indicator current sensing signal 1477 becomes larger than threshold signal 1475, then the width of driving signal 1483 Degree decline (becoming logic low from logically high), and the turn-on time section knot of switch periods associated with driving signal 1483 Beam.
According to yet another embodiment, timing comparing component 1460 receives detection signal 1485 and exports to OVP component 1462 Signal 1480.For example, OVP (output voltage overvoltage protection) component 1462 also receives comparison signal 1499 and modulated signal 1482, And signal 1481 is generated to control logic component 1468.In another example, demagnetization the period to and multiple LED 1498 it is related The output voltage of connection is inversely proportional, as follows:
Wherein VoutIndicate that output voltage associated with multiple LED 1498, IL_P indicate the peak value of electric current 1492, L table Show the inductance and T of inductor 1420demagIndicate the duration of demagnetization period.According to equation 4, in certain embodiments, when Flow through the timing of peak value one of the electric current 1492 of inductance, when output voltage higher (increasing on magnitude), the demagnetization period is shorter (to be measured Reduce in value).
According to one embodiment, timing comparing component 1460 will compare the demagnetization period with predetermined amount of time, and wherein this is pre- Section of fixing time originates in the beginning of demagnetization process associated with inductor 1420.For example, if comparing during switch periods 1499 indicator current sensing signal 1477 of signal is greater than or equal to threshold signal 1475 on magnitude, and in the pass of switch periods The demagnetization period during the disconnected period is less than predetermined amount of time, then OVP (output voltage overvoltage protection) is triggered, signal 1480 Change, predetermined amount of time is less than with the instruction demagnetization period, so that OVP component 1482 changes signal 1481 with the system of closing 1400. As an example, OVP component 1482 changes signal 1481 to the from the first signal condition (for example, correspond to first logic level) Binary signal state (for example, corresponding to the second logic level) is with the system of closing 1400.In another example, during closing process Later, signal 1483 is equal to ground voltage on magnitude, to keep switching tube 1432 (M1) in an off state for a long time.
In another embodiment, AC input 1410 is not applied (for example, being turned off).For example, passing through 1440 (example of terminal Such as, terminal VCC) provide service voltage reduce on magnitude to become smaller than the first predetermined threshold (for example, under-voltage locking threshold Value), and in response, the internal circuit of controller 1402 is refitted in specific primary condition.In another embodiment, After the internal circuit of controller 1402 has been refitted in specific primary condition, AC input 1410 is re-applied (example Such as, it is switched on).For example, being increased on magnitude by the service voltage that terminal 1440 (for example, terminal VCC) provides to become big In the second predetermined threshold (for example, electrification reset threshold value), and in response, controller 1402 starts again at normal operation.
In another embodiment, if comparison signal 1499 indicates electricity during connection of the switch 1432 in switch periods Stream sensing signal 1477 is always less than threshold signal 1475 on magnitude, then OVP component 1462 does not change signal 1481, and not Whether it is less than predetermined amount of time by the demagnetization period, i.e. whether signal 1480 indicates that the demagnetization period is less than predetermined amount of time, signal 1481, which not will lead to system 1400, closes output, i.e., does not trigger OVP (output voltage overvoltage protection, to will not disconnect for a long time (for example, shutdown) switch 1432.For example, comparing if current sensing signal 1477 is greater than threshold signal 1475 on magnitude Signal 1499 is in logic low.In another example, once OVP component 1482 changes signal 1481 with the system of closing 1400, in response to signal 1480, signal 1499 and/or signal 1482, OVP component 1482 no longer changes signal 1481.Another In example, maximum turn-on time component 1465 is at least detected and driving signal 1483 based on information associated with signal 1486 The beginning of the turn-on time section of associated switch periods, and determine whether turn-on time section is more than maximum turn-on time section. If turn-on time section is more than maximum turn-on time section, maximum turn-on time component 1465 is exported to control logic component 1468 to be believed Numbers 1455 disconnect (for example, shutdown) switch 1432 to change driving signal 1483.
In another embodiment, during the connection of each switch periods associated with switch 1432, if signal 1499 non-indicator current sensing signals 1477 are greater than or equal to threshold signal 1475 on magnitude, then OVP component 1462 does not enable The output (i.e. demagnetization period and predetermined amount of time comparison result) of timing comparing component 1460, forbids OVP to operate, and switch 1432 turn-on time is maximum turn-on time (being defined as non-normal mode).But if 1499 indicator current sense of signal It surveys signal 1477 and is greater than or equal to threshold signal 1475 on magnitude, then OVP component 1462 enables timing comparing component 1460 Output (i.e. demagnetization period and predetermined amount of time comparison result), enables OVP operation, into normal manipulation mode and is maintained at Under normal manipulation mode, i.e., current sensing signal 1477 changes modulated signal when being greater than or equal to threshold signal 1475 on magnitude The turn-on time section of 1482 instruction switch periods has terminated, and begins to turn off the period.For example, in the turn-off time section of switch periods Period, switch 1432 are disconnected (for example, being turned off).
In another embodiment, when demagnetization terminates, 1466 output signal 1486 of valley detection device changes modulated signal 1482, Indicate switch periods turn-off time section at the end of, next switch periods start.For example, in the connection phase of next switch periods Between, if the non-indicator current sensing signal 1477 of signal 1499 is greater than or equal to threshold signal 1475, OVP component on magnitude The output (i.e. demagnetization period and predetermined amount of time comparison result) of 1462 not enabled timing comparing components 1460, forbids OVP to grasp Make, and the turn-on time of switch 1432 is maximum turn-on time (for non-normal mode),.But if signal 1499 indicates Current sensing signal 1477 is greater than or equal to threshold signal 1475 on magnitude, then OVP component 1462 enables timing comparing component 1460 output (i.e. demagnetization period and predetermined amount of time comparison result) enables OVP operation, into normal manipulation mode and It keeps in a normal operation mode, i.e., current sensing signal 1477 changes when being greater than or equal to threshold signal 1475 on magnitude and adjusts Signal 1482 processed indicates that the turn-on time section of switch periods has terminated.
According to one embodiment, if OVP component 1462, under non-normal mode, OVP component 1462 is regardless of letter Numbers 1480 how, signal 1481 is held at specific logic level (for example, logic low, 0) always, to make signal 1481 not will lead to system 1400 is closed because of false triggering output voltage overvoltage protection.For example, if OVP component 1462 is just Under normal operation mode, if the demagnetization period is not less than predetermined amount of time, indicate the demagnetization period not less than predetermined in response to signal 1480 Period, signal 1481 remain unchanged and not will lead to system 1400 and be closed.
According to another embodiment, if OVP component 1462 in a normal operation mode, if demagnetization the period be less than the predetermined time Section indicates that the demagnetization period is less than predetermined amount of time in response to signal 1480, then OVP component 1482 changes signal 1481 to make System 1400 is closed.For example, after OVP component 1482 changes signal 1481 with the system of closing 1400, no matter signal 1480, Signal 1499 and/or 1482 how, signal 1481 will remain unchanged.
Fig. 6 is the simplification figure for showing power converting system according to still another embodiment of the invention.The figure is only example, It should not exceedingly limit the scope of the claims.Those skilled in the art will be recognized it is many change, replacement and Modification.
System 500 includes system controller 502, resistor 508,509,518,536 and 567, full-wave rectification bridge 513, electricity Container 524,534 and 542, switch 530, inductor 520, diode 522 and 538 and multiple LED 598.System controller 502 include switch 532, diode 550, voltage clamping 552, reference generator 558, input voltage detector 560, Enabled controller 562, demagnetize detector 564, valley detection device 566, control logic component 568, comparator 570, driving assembly 572, error amplifier 574, compensation network component 576, sampling component 561 and LEB component 578.In addition, system controller 502 include terminal 531,540,546,548 and 554.For example, switch 530 includes transistor (for example, field-effect tube, insulated gate Bipolar transistor or bipolar junction transistor).In another example, switch 532 include transistor (for example, field-effect tube, absolutely Edge grid bipolar transistor or bipolar junction transistor).
According to one embodiment, resistor 508,509,518,536 and 567, full-wave rectification bridge 513, capacitor 524, 534 and 542, switch 530, inductor 520 and diode 522 and 538 respectively with resistor 208,209,218,236 and 267, full-wave rectification bridge 213, capacitor 224,234 and 242, switch 230, inductor 220 and the phase of diode 222 and 238 Together.For example, switch 532, diode 550, voltage clamping 552, reference generator 558, input voltage detector 560, Enabled controller 562, demagnetize detector 564, valley detection device 566, control logic component 568, driving assembly 572 and LEB Component 578 respectively with switch 232, diode 250, voltage clamping 252, reference generator 258, input voltage detector 260, enable controller 262, demagnetize detector 264, valley detection device 266, control logic component 268, driving assembly 272 and LEB component 278 is identical.
According to one embodiment, AC input 510 (for example, VAC) is provided at input terminal 512 and 514, and whole Stream bridge 513 is configured to provide voltage 501 together with capacitor 542 (for example, Vbus).For example, voltage 501 is (for example, Vbus) quilt Including resistor 508 and 509 divider processing, and system controller 502 in terminal 554 (for example, terminal Vin) at receive Input signal 519.In another example, input voltage detector 560 receives input signal 519, and to enabled controller 562 Output signal 580, the enabled controller 562 generate signal 581 to control logic component 568.In another example, control logic Component 568 exports modulated signal 582 to driving assembly 572, which generates driving signal 583 with control switch 532。
According to another embodiment, switch 532 is connected in the form of cascade with switch 530.For example, switch 532 be closed or It disconnects to switch for power.In another example, switch 532 turn-on time section during, switch 532 be closed (for example, It is switched on).In another example, associated with the node (for example, node SW) between switch 530 and 532 signal 584 Amplitude declines (reducing on magnitude), and in response, switch 530 is closed (for example, being switched on).In another example, Inductor 520 is magnetized, and electric current 590 flows through switch 530 and received by system controller 502 in terminal 531.Another In example, 537 amplitude of voltage associated with the node between switch 530 and inductor 520 declines (reducing on magnitude). In another example, voltage signal 506 associated with resistor 567 by system controller 502 terminal 546 (for example, end Sub- CS) at detect, and LEB component 578 receive signal 506 and to comparator 570 export current sensing signal 577.Again In one example, switch periods associated with driving signal 583 turn-off time section during, switch 532 be disconnected (for example, It is turned off).In another example, the amplitude of signal 584 rises (increasing on magnitude), and in response, switch 530 is broken Open (for example, being turned off).In another example, inductor 520 is demagnetized, and electric current 592 flows through diode 522, capacitor 524 and multiple LED 598.In another example, signal 537 increases (for example, becoming close to voltage 501) on magnitude.Again In one example, error amplifier 574 includes trsanscondutance amplifier.In another example, error amplifier 574 is implemented as integrator A part.
According to yet another embodiment, it flows through the output electric current 588 of multiple LED 598 and flows through the average current of inductor 520 Associated (for example, being equal to).For example, flowing through the flat of inductor 520 if system 500 is run under quasi-resonance (QR) mode Equal electric current is approximately equal to the half of the peak value of electric current 590.In another example, in one or more associated with switch 532 During previous switching period, one or more peak values of current sensing signal 577 are sampled by sampling component 561, the sampling 561 output signal 551 of component.In another example, error amplifier 574 receives signal 551 and reference signal 553, and puts Difference between big signal 551 and reference signal 553.In another example, error amplifier 574 is defeated to compensation network component 576 Signal 555 (for example, current signal) out, the compensation network component 576 is to 570 output signal 557 of comparator.In another example In, 570 comparison signal 557 of comparator and current sensing signal 577, and comparison signal is exported to control logic component 568 559, to influence the one or more of electric current 590 during the next switch periods of one or more associated with switch 532 Peak value, the average current for then flowing through inductor 520 are conditioned.In another example, if comparison signal 559 is patrolled from first It collects level (for example, 1) to change into the second logic level (for example, 0), indicator current sensing signal 577 becomes big on magnitude In signal 557, then driving signal 583 becomes in logic low (for example, 0 level) from logically high, and with driving signal 583 The turn-on time section of associated switch periods terminates.
According to yet another embodiment, signal 584 associated with the node SW between switch 530 and 532 is detected by demagnetization Device 564 receives, which is configured to determine the demagnetization period associated with inductor 520.For example, trough is examined It surveys device 566 and receives detection signal 585 from demagnetization detector 564, and to 568 output signal 586 of control logic component.As Example, valley detection device 566 detects that the first trough appears in signal 584, and changes signal 586, so that driving be made to believe Numbers 583 become logically high (for example, 5V level) (rising edge appears in driving signal 583) from logic low, and believe with driving The turn-on time section of number 583 associated switch periods starts.For example, at least based on information associated with signal 506 and with The associated demagnetization period of inductor 520 can be estimated to export the size of electric current 588.
In one embodiment, during the start-up course of system 500, capacitor 534 is in response to 501 (example of voltage signal Such as, pass through resistor 518) it is electrically charged, and the amplitude of voltage 535 rises (increasing on magnitude).For example, if voltage 535 become larger than starting threshold voltage, then controller 502 brings into operation.As an example, related to voltage signal 501 (for example, It is proportional) signal 519 be entered voltage detector 560 and sense.If voltage signal 501 is greater than predetermined threshold, enable 562 output signal 581 (for example, being in logic high) of controller, so that control logic component 568 be made to export modulated signal 582 turn on and off switch 532 with modulating frequency, so that system 500 be made normally to be run, LED light 598 is lit.Such as Fruit voltage signal 501 is less than predetermined threshold, then controller 502 in the off mode, and enabled 562 output signal of controller 581 (for example, being in logic low), so that not exporting control logic component 568 turns on and off switch with modulating frequency 532 modulated signal 582, switch 532 remain turned off, and flow through LED light 598 from without electric current, LED light 598 is not It is lit.In some embodiments, voltage signal 501 is carried out by input voltage detector 560 always during system 500 is run Sensing.In other embodiments, voltage signal 501 is only entered voltage during start-up course and subsequent in one section of short time Detector 560 senses.In some embodiments, during start-up course, once voltage signal 501 becomes larger than predetermined threshold, Enabled 562 output signal 581 of controller, so that system 500 be made to bring into operation.For example, once system 500 brings into operation, even if Signal 501 becomes smaller than predetermined threshold, and enabled controller 562 will not change signal 581, and signal 581 keeps being in phase Same logic level (for example, being in logic low), so that system 500 be made to continue to operate normally.
In another embodiment, when switch 532 is disconnected (for example, being turned off), voltage 537 is disconnected it in switch 532 Its amplitude rises (increase on magnitude) immediately afterwards.For example, switch 530, inductor 520 and associated parasitic capacitance are opened Begin to vibrate.In another example, one or more spikes begin to appear in the node (example between switch 530 and switch 532 Such as, node SW) in associated signal 584.In another example, if one or more spikes are greater than and voltage clamping 552 (for example, Zener diode) associated clamping voltags add forward voltage associated with diode 550, then the spike It is absorbed by diode 550 by capacitor 534 and voltage clamping 552.In another example, one or more spikes are to capacitor Device 534 provides supply charge or electric current to provide service voltage to controller 502 by terminal 540 (for example, terminal VCC).? In another example, all internal circuits of controller 502 obtain power supply by terminal 540 (for example, terminal VCC).
Fig. 7 is the simplification figure for showing power converting system according to still another embodiment of the invention.The figure is only example, It should not exceedingly limit the scope of the claims.Those skilled in the art will be recognized it is many change, replacement and Modification.
System 600 includes system controller 602, resistor 608,609,618 and 667, full-wave rectification bridge 613, capacitor 624,634 and 642, inductor 620, diode 622 and multiple LED 698.System controller 602 include switch 632, two Pole pipe 638 and 650, resistor 636, voltage clamping 652, reference generator 658, input voltage detector 660 make It can control device 662, demagnetize detector 664, valley detection device 666, control logic component 668, comparator 670, driving assembly 672, error amplifier 674, compensation network component 676, sampling component 661 and LEB component 678.In addition, system controller 602 include terminal 631,640,646,648 and 654.For example, switch 630 includes transistor (for example, field-effect tube, insulated gate Bipolar transistor or bipolar junction transistor).In another example, the switch 632 include transistor (for example, field-effect tube, Insulated gate bipolar transistor or bipolar junction transistor).
According to one embodiment, resistor 608,609,618,636 and 667, full-wave rectification bridge 613, capacitor 624, 634 and 642, switch 630, inductor 620 and diode 622 and 638 respectively with resistor 508,509,518,536 and 567, full-wave rectification bridge 513, capacitor 524,534 and 542, switch 530, inductor 520 and the phase of diode 522 and 538 Together.For example, switch 632, diode 650, voltage clamping 652, reference generator 658, input voltage detector 660, Enabled controller 662, demagnetize detector 664, valley detection device 666, control logic component 668, driving assembly 672, comparator 670, error amplifier 674, compensation network component 676, sampling component 661 and LEB component 678 respectively with switch 532, two poles Pipe 550, voltage clamping 552, reference generator 558, input voltage detector 560 enable controller 562, demagnetization inspection Survey device 564, valley detection device 566, control logic component 568, driving assembly 572, comparator 570, error amplifier 574, benefit Networking component 576 is repaid, sampling component 561 and LEB component 578 are identical.In some embodiments, the execution of system 600 and system 500 similar operations.
Fig. 8 be show according to some embodiments of the present invention power converting system 200 as shown in Figure 2, in such as Fig. 4 Shown in power converting system 400, power converting system as shown in Figure 6 500 and/or power conversion system shown in fig. 7 The simplified timing diagram of the demagnetization detection of system 600.The figure is only example, should not exceedingly limit the scope of the claims. Many changes, substitutions and modifications will be recognized in those skilled in the art.
For example, waveform 702,704 and 706 respectively describes the power conversion run at discontinuous conduction mode (DCM) Certain operations of system 200, certain operations of the power converting system 400 run at discontinuous conduction mode (DCM), not Certain operations of the power converting system 500 run under continuous conduction mode (DCM) and/or at discontinuous conduction mode (DCM) Certain operations of the power converting system 600 of lower operation.In another example, waveform 702 indicates letter of the signal 237 as the time Number, waveform 704 indicate that signal 284 indicates letter of the slope of signal 284 as the time as the function and waveform 706 of time Number.In another example, turn-on time section TonIn time t5Place starts and in time t6Place terminates, and the period T that demagnetizesdemag In time t6Place starts and in time t7Place terminates.In another example, t5≤t6≤t7。
According to one embodiment, in turn-on time section (for example, Ton) during, both switch 230 and switch 232 are closed It closes (for example, being switched on).For example, the electric current 290 for flowing through switch 230 increases on magnitude.In another example, 237 (example of signal Such as, VD) and signal 284 (for example, VSW) there is low amounts value (for example, respectively as shown in waveform 702 and waveform 704).Show another In example, if both switch 230 and switch 232 are disconnected (for example, being turned off), electric current 290 is decreased to low amounts value (example Such as, 0), and start demagnetization process.For example, in demagnetization period TdemagPeriod, signal 237 is (for example, VD) it is similar to magnitude 708 (for example, as shown in waveform 702), and signal 284 is (for example, VSW) it is similar to magnitude 710 (for example, as shown in waveform 704).? In another example, demagnetization process ends at time t7Place.For example, signal 284 is (for example, VSW) quickly reduced on magnitude (for example, As shown in waveform 704).In another example, it can be based on signal 284 (for example, VSW) associated information detects demagnetization.
As emphasizing as discussed above and further herein, Fig. 8 is only example, should not exceedingly be limited The scope of the claims processed.Many changes, substitutions and modifications will be recognized in those skilled in the art.For example, on although Face is the timing diagram based on the power converting system 200 operated in dcm mode about the discussion of Fig. 8, but according to certain implementations Example, the scheme for detection of demagnetizing are also applied to the power converting system run under discontinuous conduction mode or under quasi-resonant mode 200.As an example, when waveform 702 indicates that signal 437 associated with the node between switch 430 and inductor 420 is used as Between function, waveform 704 indicates the letter of associated with the node between switch 430 and switch 432 signal 484 as the time Several and waveform 706 indicates function of the slope of signal 484 as the time.In another example, waveform 702 indicates signal 537 function as the time, waveform 704 indicate that signal 584 indicates signal 584 as the function and waveform 706 of time Function of the slope as the time.As another example, the expression of waveform 702 and the node between switch 630 and inductor 620 Function of the associated signal 637 as the time, waveform 704 indicate associated with the node between switch 630 and switch 632 Function of the signal 684 as the time, waveform 706 indicates function of the slope of signal 684 as the time.
Fig. 9 is to show according to some embodiments of the present invention one as power converting system 200 as shown in Figure 2 Point demagnetization detector 264, the demagnetization detector 464, such as a part of power converting system 400 as shown in Figure 4 As the demagnetization detector 564 of a part of power converting system 500 and/or as shown in Figure 7, power supply becomes shown in Fig. 6 Change the simplification figure of certain components of the demagnetization detector 664 of a part of system 600.The figure is only example, should not mistake Degree ground limitation the scope of the claims.Many changes, substitutions and modifications will be recognized in those skilled in the art.For example, The detector 264 that demagnetizes includes capacitor 802, two resistors 804 and 806, comparator 808, blanking component 810, timing control Component 812, two trigger (flip- flop) components 814 and 819, NOT gate 816 and with door 818.
According to one embodiment, signal 284 is (for example, VSW) be received at capacitor 802.For example, the slope of signal 284 It is detected by using the differentiator (differenrtiator) comprising capacitor 802 and resistor 804 and 806.Another In one example, differential signal 820 is generated, and the slope for being equal to signal 284 deviates V plus direct current (DC)m.In another example In, DC deviates VmIt is determined based on following equation:
Wherein VmIndicate DC offset, Vref1Indicate reference voltage 824, R3Indicate the resistance and R of resistor 8044It indicates The resistance of resistor 806.
According to another embodiment, comparator 808 receives differential signal 820 and threshold signal 822, and to blanking component 810 output comparison signals 826 are to influence trigger assembly 814 and 816.For example, driving signal 283 be blanked component 810 and when Sequence control assembly 812 is received to influence trigger assembly 814 and 816.In another example, to each switch periods, when opening When pass 232 is disconnected (for example, shutdown) in response to driving signal 283, demagnetization process starts.In another example, it is demagnetizing During process, differential signal 820 is not less than threshold signal 822 on magnitude.In another example, if differential signal 820 becomes It obtains and is less than threshold signal 822 on magnitude, then detect the end of demagnetization process.In another example, comparator 808 changes ratio Compared with signal 826, to change detection signal 285.
As emphasizing as discussed above and further herein, Fig. 9 is only example, should not exceedingly be limited The scope of the claims processed.Many changes, substitutions and modifications will be recognized in those skilled in the art.For example, on although State the diagram of the demagnetization detector 264 of the discussion of Fig. 9 based on a part as power converting system 200, but detection of demagnetizing Scheme can be applicable to the demagnetization detector 464 of a part as power converting system 400, as power converting system 500 In the demagnetization detector 564 of a part and/or the demagnetization detector 664 of a part as power converting system 600.
According to one embodiment, a kind of system controller for adjusting power converting system includes: detection components, the inspection It surveys component to be configured to receive input voltage relevant to the diode for being connected to inductor, and is greater than in response to input voltage Predetermined threshold exports the first signal with the first logic level；Control logic component, the control logic component are configured to receive One signal handles information associated with the first signal, and is in the first logic level, output and tune in response to the first signal The modulated signal of frequency dependence processed；And driving assembly, the driving assembly are configured to receive modulated signal, and output driving Signal that first switch is disconnected and be closed with modulating frequency, to be closed in response to first switch, inductor is configured to lead to Switch the first electric current of output is crossed, and is disconnected in response to first switch, inductor is configured to export second by diode Electric current.For example, realizing the system controller according at least to Fig. 2, Fig. 4, Fig. 5, Fig. 6 and/or Fig. 7.
According to another embodiment, a kind of system controller for adjusting power conversion component includes: the first transistor, should The first transistor includes the first transistor terminal, second transistor terminal and third transistor terminal, wherein first crystal pipe end Son is coupled to the 4th transistor terminal of second transistor, and second transistor further includes the 5th transistor terminal and the 6th crystal Pipe end.5th transistor terminal is coupled to the first resistor device terminal of first resistor device, and first resistor device further includes the second electricity Hinder device terminal.5th transistor terminal is coupled to the first diode terminal of first diode, which further includes Two diode terminals.Second diode terminal is coupled to second resistor terminal.System controller is configured to change the 4th crystalline substance The first voltage of body pipe end influences to flow through the electric current of inductor to turn on and off second transistor.For example, at least root The system controller is realized according to Fig. 2, Fig. 4, Fig. 5, Fig. 6 and/or Fig. 7.
According to yet another embodiment, a kind of system controller for adjusting power converting system includes: sampling component, this is adopted Sample component is configured to sample one or more peak values of current sensing signal associated with the first electric current, and extremely Few to generate output signal based on information associated with the one or more peak values of current sensing signal sampled, this first Electric current flows through switch from inductor；Error amplifier, the error amplifier are configured to receive output signal and reference signal, and And amplified signal is at least generated based on information associated with output signal and reference signal；Comparator, the comparator are matched It is set to and receives current sensing signal and the first signal associated with amplified signal, and be at least based on and the first signal and electric current Sensing signal associated information exports comparison signal；And control and driving assembly, the control are configured with driving assembly At receive comparison signal, and at least based on information associated with comparison signal come output drive signal with closing or opening institute Switch is stated to influence the first electric current.For example, system controller at least according to fig. 2, Fig. 4, Fig. 5, Fig. 6 and/or Fig. 7 come it is real Existing.
According to yet another embodiment, a kind of system controller for adjusting power converting system includes: protection component, the guarantor Protecting assembly is configured to receive the first signal and the second signal, and at least based on associated with the first signal and the second signal Information generates third signal, the first signal to and inductor relevant demagnetization period it is associated, second signal and flow through inductance First electric current of device is associated；And control and driving assembly, the control and driving assembly are configured to receive third signal, and And to switch output drive signal to influence the first electric current.The protection component is further configured to believe in response to second signal and first Number following instruction third signal is changed into second signal state from the first signal condition so that power converting system is closed It closes, wherein during the first switch period associated with driving signal, the first electric current is equal to or more than electricity for second signal instruction Threshold value is flowed, and the first signal designation, during the turn-off time section in first switch period, the demagnetization period is less than predetermined amount of time. For example, realizing the system controller according at least to Fig. 5.
In one embodiment, a kind of method for adjusting power converting system includes: to receive and be connected to inductor The relevant input voltage of diode；Handle information associated with input signal；It is greater than predetermined threshold in response to input voltage, The first signal is exported with the first logic level；Receive the first signal；And processing information associated with first signal.The party Method further include: be in the first logic level in response to the first signal, export modulated signal relevant to modulating frequency；Receive modulation Signal；And processing information associated with the modulated signal.In addition, this method comprises: output drive signal is come to modulate frequency First switch is opened or closed in rate；It is closed in response to first switch, the first electric current is exported by switch；And in response to this One switch is disconnected, and exports the second electric current by diode.For example, being realized according at least to Fig. 2, Fig. 4, Fig. 5, Fig. 6 and/or Fig. 7 This method.
In another embodiment, a kind of method for adjusting power converting system includes: to associated with the first electric current One or more peak values of current sensing signal sampled, which flows through switch from inductor；At least based on The associated information of one or more peak values sampled of the current sensing signal generates output signal；Receive output signal And reference signal；And handle information associated with output signal and reference signal.This method further include: at least based on it is defeated Signal and the associated information of reference signal generate amplified signal out；Receive current sensing signal and associated with amplified signal The first signal；Handle information associated with current sensing signal and the first signal；And at least based on the first signal and Current sensing signal associated information exports comparison signal.In addition, this method comprises: receiving comparison signal；Processing with than Compared with the associated information of signal；And at least based on information associated with comparison signal come output drive signal to be closed or break The switch is opened, to influence the first electric current.For example, realizing this method according at least to Fig. 2, Fig. 4, Fig. 5, Fig. 6 and/or Fig. 7.
In another embodiment, a kind of method for adjusting power converting system includes: to receive the first signal and second Signal；Handle information associated with the first signal and the second signal；And it is at least based on and the first signal and the second signal phase Associated information generates third signal, first signal to and inductor relevant demagnetization period it is associated, the second signal It is associated with the first electric current of inductor is flowed through.This method further include: receive third signal；It handles associated with third signal Information；To switch output drive signal to influence the first electric current；And in response to the following instruction of second signal and the first signal, Third signal is changed into second signal state so that the power converting system is closed, wherein second from the first signal condition For signal designation during the first switch period associated with driving signal, the first electric current is greater than or equal to current threshold, and For first signal designation during the turn-off time section in first switch period, the demagnetization period is less than predetermined amount of time.For example, at least root This method is realized according to Fig. 5.
For example, each of some or all components of various embodiments of the present invention are by using one or more software groups One or more combinations of part, one or more hardware component and/or software and hardware component, individually and/or with it is at least another One component is realized in combination.In another example, each of some or all components of various embodiments of the present invention are independent Ground and/or in combination at least another component realize in one or more circuits, which is, for example, one A or multiple analog circuits and/or one or more digital circuits.In yet another example, various realities of the invention can be combined Apply example and/or example.
Although the particular embodiment of the present invention is described, it should be appreciated by those skilled in the art that It is the presence of the other embodiments being equal with described embodiment.It is understood, therefore, that the present invention will not be by specifically showing Embodiment out limits, but is only limited by scope of the appended claims.

Claims (4)

1. a kind of for adjusting the system controller of power converting system, the system controller includes:
The first transistor, the first transistor include the first transistor terminal, second transistor terminal and third transistor terminal, The first transistor terminal is coupled to the 4th transistor terminal of second transistor, and the second transistor further includes the 5th Transistor terminal and the 6th transistor terminal；
Wherein:
5th transistor terminal is coupled to the first resistor device terminal of first resistor device, and the first resistor device further includes Second resistor terminal；
5th transistor terminal is coupled to the first diode terminal of first diode, and the first diode further includes Second diode terminal；
Second diode terminal is coupled to the second resistor terminal；
Wherein the system controller is configured to change the first voltage of the 4th transistor terminal to turn on and off Second transistor is stated, and controls or influence to flow through the electric current of inductor,
Wherein the system controller is further configured to keep the second voltage of the 5th transistor terminal constant, and changes The first voltage of 4th transistor terminal is to turn on and off the second transistor and control or influence to flow through The electric current of the inductor,
The wherein system controller further include:
First controller terminal, the first controller terminal are coupled to the second resistor terminal and second diode Terminal；And
Second diode, second diode include third diode terminal and the 4th diode terminal, the third diode Terminal is coupled to the first controller terminal, and the 4th diode terminal is coupled to the first transistor terminal.
2. system according to claim 1 controller, further includes:
Clamp element, the clamp element are configured to prevent second voltage associated with the first controller terminal to be more than pre- Determine threshold value.
3. system according to claim 1 controller, wherein the first controller terminal is coupled to including the first electricity The capacitor of container terminal and the second capacitor terminal.
4. system controller according to claim 3, wherein the first capacitor device terminal is coupled to second electricity Hinder device terminal and second diode terminal.
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