CN109347066A - A kind of pair side control circuit and its isolated power converting circuit and over-voltage protection method - Google Patents
A kind of pair side control circuit and its isolated power converting circuit and over-voltage protection method Download PDFInfo
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- CN109347066A CN109347066A CN201811457109.2A CN201811457109A CN109347066A CN 109347066 A CN109347066 A CN 109347066A CN 201811457109 A CN201811457109 A CN 201811457109A CN 109347066 A CN109347066 A CN 109347066A
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- 230000001681 protective effect Effects 0.000 claims abstract description 30
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of secondary side control circuit for isolated power converting circuit and corresponding isolated power converting circuits and over-voltage protection method.Secondary side control circuit includes overvoltage protective module; overvoltage protective module is used to provide protection to isolated power converting circuit in output voltage over-voltage; overvoltage protective module includes: the first comparison circuit, for comparing the detection signal and first threshold signal of characterization output voltage；State detection circuit determines the transition state of isolated power converting circuit based on the signal of secondary circuit；And pulse-generating circuit, the comparison result based on the first comparison circuit determines whether to occur over-voltage fault, and selectively secondary side rectifying tube is connected in output over-voltage protection signal to the transition state based on isolated power converting circuit.Over-voltage detection is put into secondary circuit and carried out by pair side control circuit and control method provided by the invention, improves the detection accuracy and reliability of the output voltage overvoltage protection of isolated power converting circuit.
Description
Technical field
The present invention relates to electronic fields, and in particular to a kind of secondary side control circuit for isolated power converting circuit and
Its isolated power converting circuit and over-voltage protection method.
Background technique
Overvoltage protection (OVP) is one of most important function in switching power circuit, for avoiding being supported on output electricity
Malfunction or damage caused by when pressing through high.In the isolated power converting circuit or nothing using primary side adjustment (PSR) scheme
In line charge electricity power converting circuit, primary controller can not obtain the accurate information of output voltage in time；When output voltage is sent out
When raw over-voltage, primary controller cannot timely and accurately generate error protection.The isolated power converting circuit of PSR, which usually passes through, to be adopted
Feedback signal with an auxiliary winding or is directly obtained by primary side winding, as shown in Figure 1.By will be anti-on auxiliary winding Wa
Feedback signal FB and threshold signal are compared to judge whether output voltage Vo occurs over-voltage.But obtained from auxiliary winding
Feedback signal not can accurately reflect output voltage in some circumstances, such as in feelings such as dummy load (Dummy Load) open circuits
Condition.Therefore the overvoltage protection precision of this mode is poor, is failure to actuate when the generation overvoltage protection, to generate danger to load
Evil.
Summary of the invention
It is set forth above it is an object of the present invention to provide eliminating for one or more problems in the prior art
At least partly isolated power converting circuit of defect, secondary side control circuit and over-voltage protection method.
According to an aspect of the invention, there is provided a kind of secondary side control circuit for isolated power converting circuit,
Including overvoltage protective module, overvoltage protective module is used in the output voltage over-voltage of isolated power converting circuit to isolated
Power converting circuit provides protection, and overvoltage protective module includes: the first comparison circuit, for comparing the detection of characterization output voltage
Signal and first threshold signal；State detection circuit determines isolated electricity based on the secondary side signal of isolated power converting circuit
The transition state of source translation circuit；And pulse-generating circuit, comparison result and isolated power supply based on the first comparison circuit
Selectively secondary side rectifying tube is connected in output over-voltage protection signal to the transition state of translation circuit.
In one embodiment, state detection circuit includes the second comparison circuit, the first input end of the second comparison circuit
Coupling vice-side winding couples second threshold signal for obtaining winding end signal, the second input terminal of the second comparison circuit.
In one embodiment, secondary side control circuit has first port and second port, and it is whole that first port couples secondary side
The source terminal or anode tap of flow tube and benchmark port as secondary side control circuit, second port couple the leakage of secondary side rectifying tube
Extreme or cathode terminal；State detection circuit includes the second comparison circuit, and the first input end of the second comparison circuit couples second end
Mouthful, the second input terminal of the second comparison circuit couples second threshold signal, when second port voltage is greater than second threshold signal,
State detection circuit exports effective value signal for allowing overvoltage protection signal that secondary side rectifying tube is connected.
In one embodiment, overvoltage protective module includes: and door to couple the first comparison circuit with the first input end of door
Output end, the output end of the second comparison circuit is coupled with the second input terminal of door, when exporting high level signal with door, pulse
Secondary side rectifying tube is connected in the overvoltage protection signal of generation circuit output effective status.
In one embodiment, secondary side control circuit has first port and second port, and it is whole that first port couples secondary side
The first end of flow tube, second port couple the second end of secondary side rectifying tube, and overvoltage protective module further comprises: sampling keeps electricity
Road, including sampling switch and capacitor, wherein the first end of sampling switch couples second port, and the second end of sampling switch couples electricity
Hold for providing the detection signal of characterization output voltage, the second end of sampling switch couples the first input of the first comparison circuit
End；Second input terminal of the first comparison circuit couples first threshold signal；And sampling control module, sampling control module it is defeated
The control terminal of outlet coupling sampling switch.
In one embodiment, sampling control module is connected after detecting the predetermined time that secondary side rectifying tube terminates rectification
Sampling switch.In one embodiment, the predetermined time is between 50-400 microsecond.
In one embodiment, when the detection signal of characterization output voltage is greater than first threshold signal and primary side switch is connected
When, pulse-generating circuit output makes the overvoltage protection signal of secondary side rectifying tube conducting.
In one embodiment, overvoltage protective module further comprises: trigger circuit, the input terminal of trigger circuit coupling the
The output end of the output end of one comparison circuit, trigger circuit couples pulse-generating circuit.
In one embodiment, secondary side control circuit further comprises: synchronous commutating control circuit, output synchronous rectification letter
Number；And door or door first input end coupling synchronous rectification signal or door the second input terminal coupling overvoltage protection letter
Number or the output end of door couple the control terminal of secondary side rectifying tube.
In one embodiment, the secondary rectifying tube when control circuit further comprises described secondary, secondary side rectifying tube include opening
Close transistor npn npn.
In one embodiment, secondary side control circuit further comprises second switch, wherein secondary side rectifying tube includes two poles
Pipe, the both ends that second switch is connected across diode are connected with diodes in parallel.
According to another aspect of the present invention, a kind of secondary side control electricity for isolated power converting circuit is provided
Road.Wherein isolated power converting circuit includes primary circuit and secondary circuit, and primary circuit receives input voltage, primary circuit
Including primary side winding and primary side switch；Secondary circuit includes vice-side winding and secondary side control circuit, vice-side winding and primary side winding
Coupling composition transformer, secondary circuit provide the output voltage of isolated power converting circuit, wherein secondary side control circuit includes
Overvoltage protective module, overvoltage protective module is after isolated power converting circuit output voltage is greater than predetermined threshold and when primary side is opened
When closing conducting, one pulse signal of output controls secondary side rectifying tube conducting, for triggering overcurrent protection in primary circuit.
According to a further aspect of the invention, isolated power converting circuit described in any embodiment as above is provided.
In one embodiment, primary side winding first end couples input power, and the second end coupling primary side of primary side winding is opened
The first end of pass, the second end of primary side switch couple primary side reference ground or couple primary side reference ground by sampling resistor；Secondary side around
The first end of group is with coupling secondary side reference or the second end of secondary side rectifying tube, the second end of vice-side winding couple secondary side rectifying tube
The output end of first end or isolated power converting circuit.
In one embodiment, primary circuit further comprises over-current detection circuit, and over-current detection circuit ought flow through original
Output overcurrent protection signal acts primary side switch shutdown switch when the electric current of side winding is more than third threshold value.
According to a further aspect of the invention, it provides a kind of for providing output voltage over-voltage to isolated switching circuit
The method of protection.This method comprises: secondary circuit detects output voltage；Judge whether output voltage is greater than first threshold；Monitoring
The state of switching circuit；When output voltage is greater than first threshold and monitors that switching circuit state meets predetermined condition, conducting
Secondary side rectifying tube, for generating fault-signal in primary side；When primary circuit senses fault-signal, primary circuit is made to stop work
Make.
In one embodiment, the state of monitoring switch circuit includes: whether the pressure difference at monitoring secondary side rectifying tube both ends is big
In second threshold, when output voltage is greater than second threshold greater than the pressure difference of first threshold and secondary side rectifying tube both ends, conducting is secondary
Side rectifying tube.
In one embodiment, detection output voltage includes examining after the predetermined time that secondary side rectifying tube terminates synchronous rectification
Survey the drain-source pressure difference of secondary side rectifying tube.
In one embodiment, it includes that primary circuit is triggered overcurrent protection that primary circuit, which senses fault-signal,.
Pair side provided by the invention control circuit, isolated power converting circuit and over-voltage protection method, over-voltage is detected
It is put into secondary circuit progress, primary circuit guard mode is triggered by the way that secondary side rectifying tube is connected in a particular state, improves
The detection accuracy and reliability of the output voltage overvoltage protection of isolated power converting circuit.Other specific advantages of the invention will
It is embodied in following specific embodiment.
Detailed description of the invention
Fig. 1 shows the isolated supply convertor overvoltage protection topology schematic diagram of correlation technique；
Fig. 2 shows isolated power converting circuit block diagram representations according to an embodiment of the invention；
Fig. 3 shows isolated power converting circuit schematic diagram according to an embodiment of the invention；
Fig. 4 shows a kind of secondary side rectifying tube control mode schematic diagram according to an embodiment of the invention；
Fig. 5 shows the waveform diagram of signal in 3 circuit of corresponding diagram according to an embodiment of the invention；
Fig. 6 shows secondary side control circuit schematic diagram according to an embodiment of the invention；
Fig. 7 shows the waveform diagram of signal in 6 circuit of corresponding diagram according to an embodiment of the invention；
Fig. 8 shows the side according to an embodiment of the invention to isolated switching circuit offer output voltage overvoltage protection
Method schematic process flow diagram.
Identical label represents the same or similar component or composition in different schematic diagrames.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
Just for several typical embodiments, the present invention is not limited merely to the model of embodiment description for the description of the part
It encloses.Some technical characteristics in the combination of different embodiments, different embodiments are replaced mutually, same or similar existing skill
Some technical characteristics in art means and embodiment are replaced mutually also in the range of describe and claim of the present invention.
" coupling " in specification includes to be directly connected to, also comprising being indirectly connected with, as by electrically-conducting medi such as conductor
Connection, wherein the electrically-conducting medi can contain parasitic inductance or parasitic capacitance.May also include well known to a person skilled in the art
The connection on the basis of same or similar function purpose by other active devices or passive device can be achieved, such as by switch, with
With the connection of the circuits such as circuit or component.
Fig. 2 shows isolated power converting circuit block diagram representations according to an embodiment of the invention.Isolated power supply
Translation circuit can also claim isolated switching circuit, isolated supply convertor etc..Isolated power converting circuit includes primary side electricity
Road 21 and secondary circuit 22.Primary circuit 21 receives input voltage vin.Primary circuit 21 includes primary side winding Wp and primary side switch
S1.Secondary circuit 22 includes vice-side winding Ws and secondary side control circuit 221.In the illustrated embodiment, secondary side control circuit 221
Including secondary side rectifying tube S2.In another embodiment, a part of the secondary control circuit 221 when rectifying tube S2 is not belonging to secondary.
Vice-side winding Ws and primary side winding Wp coupling composition transformer.It is dynamic by the switch for carrying out turn-on and turn-off to primary side switch S1
Make, isolated power converting circuit by converting, provides input voltage vin to isolated power converting circuit in secondary circuit 22
Output voltage Vo, for drive load.
Secondary side control circuit 221 includes overvoltage protective module 222, and overvoltage protective module 222 is used in output voltage Vo mistake
Protection is provided to isolated power converting circuit when pressure.Overvoltage protective module 222 includes: the first comparison circuit 224, for comparing
Characterize the detection signal Vs and first threshold signal Vth1 of output voltage；State detection circuit 225, the letter based on secondary circuit 22
Number determine the transition state of isolated power converting circuit；And pulse-generating circuit 226, based on the first comparison circuit 224
Selectively output over-voltage protection signal makes secondary side rectifying tube S2 to the transition state of comparison result and isolated power converting circuit
Conducting.Selectively output over-voltage protection signal includes that secondary side rectifying tube is connected in the overvoltage protection signal of output effective status.
When overvoltage protection signal is invalid state, secondary side rectifying tube can be controlled by synchronous rectification signal.
In one embodiment, when the detection signal Vs for characterizing output voltage is greater than threshold signal Vth1, and it is isolated
When power converting circuit is in specific state, the overvoltage protection signal pulse that pulse-generating circuit 226 exports effective status will
Secondary side rectifying tube S2 conducting, for generating the signal that primary side can be identified significantly in primary circuit 21 and being protected in primary side triggering overcurrent
Shield.
Preferably, isolated power converting circuit includes inverse-excitation type voltage changer.Certainly, isolated power converting circuit
There can also be other topologys.
In a specific embodiment, output voltage of the overvoltage protective module 222 in isolated power converting circuit
Vo is greater than after first threshold and when detecting primary side switch S1 conducting, and output one pulse signal control pair side rectifying tube S2 is led
It is logical, so that primary circuit generates electric current point punching to trigger the overcurrent protection of primary circuit 21, and then realize overvoltage protection.
In this way, by secondary frontier inspection survey output voltage whether over-voltage, and when detecting over-voltage using every
Secondary side rectifying tube is connected in particular moment from formula power converting circuit, to generate the signal that can significantly identify in primary side to trigger
The error protection of primary circuit is avoided and is caused by auxiliary winding or primary side winding detection output voltage to realize overvoltage protection
Measurement inaccuracy problem.
Fig. 3 shows isolated power converting circuit schematic diagram according to an embodiment of the invention.Isolated power conversion
The primary circuit of circuit includes primary side winding Wp, primary side switch S1 and primary-side-control circuit.The pair of isolated power converting circuit
Rectifying tube S2 and secondary side control circuit 221 when circuit includes vice-side winding Ws, is secondary.The wherein first end coupling of primary side winding Wp
The first end of the second end coupling primary side switch S1 of input power Vin, primary side winding Wp, the second end of primary side switch S1 couples former
Side couples primary side reference ground PGND with reference to ground PGND or by a sampling resistor.The first end of vice-side winding Ws is (as shown in the figure
Different name end) coupling secondary side reference SGND (upper tube rectifying tube) or pair side rectifying tube S2 second end (down tube rectifying tube), secondary side
The first end (upper tube rectifying tube) or isolated of second end (Same Name of Ends as shown in the figure) the coupling pair side rectifying tube S2 of winding Ws
The output end vo (down tube rectifying tube) of power converting circuit.The secondary first end in rectifying tube S2 rectifying tube S2 while secondary is whole to synchronize
It can be the source terminal of pipe S2 when flow tube, be the anode tap that asynchronous rectified Guan Shike is pipe S2 in secondary side rectifying tube S2.Secondary side rectification
The second end of pipe S2 can be the drain electrode end or cathode terminal of pair side rectifying tube S2.In the first case, when secondary side rectifying tube S2 is
When upper tube, SGND, the second end of secondary side rectifying tube S2 couple isolated electricity to the first end of vice-side winding Ws with coupling secondary side reference
The output end vo of source translation circuit.In second situation, when secondary side rectifying tube S2 is down tube, the second end of vice-side winding Ws
Couple the output end vo of isolated power converting circuit, the first end coupling secondary side reference of secondary side rectifying tube S2 ground SGND.Pass through
The switch motion of turn-on and turn-off is carried out to primary side switch S1, isolated power converting circuit is electric by the received input of primary circuit
It presses Vin by transformation, provides the output voltage Vo of isolated power converting circuit in secondary circuit.Secondary side control circuit 221 is wrapped
Overvoltage protective module 222 is included, for providing protection to isolated power converting circuit in output voltage Vo over-voltage.Isolated electricity
Source translation circuit can also further comprise rectification circuit, for filtering alternating current such as commercial power rectification at direct current, and through input capacitance
Wave provides DC bus-bar voltage.
In the embodiment shown in fig. 3, overvoltage protective module 222 includes the first comparison circuit 224, trigger circuit T1, shape
State detection circuit 225 and door AND and pulse-generating circuit 226.First comparison circuit 224 is used for including comparator COM1 will be defeated
The detection signal Vs of voltage Vo or characterization output voltage Vo are compared with first threshold signal Vth1 out, and in output voltage Vo
Or the detection signal Vs of output voltage be greater than threshold value Vth1 when make trigger circuit T1 output effective status signal CP.Scheming
In the embodiment shown, trigger circuit T1 includes rest-set flip-flop, has set input S, the RESET input R and output end Q, wherein
The output end of the set input S coupling comparison circuit COM1 of rest-set flip-flop T1, the output end Q of rest-set flip-flop T1 provide signal
CP.The RESET input R of rest-set flip-flop T1 can couple the source terminal of secondary synchronous rectifier S2.Trigger circuit T1 also can be considered
A part of one comparison circuit 224.State detection circuit 225 is used to determine isolated power conversion based on the signal of secondary circuit
The transition state of circuit.In the illustrated embodiment, state detection circuit 225 includes the second comparison circuit COM2, and second compares
The first input end of circuit COM2 receives the pressure difference signal Vds at rectifying tube both ends, specifically can be the leakage-of secondary synchronous rectifier
Second input terminal of source voltage, the second comparison circuit COM2 couples second threshold signal Vth2.When pressure difference signal Vds is greater than second
When threshold value Vth2, determine that primary side switch S1 is connected, so that the output end in state detection circuit 225 exports effective status signal
Sta.Any suitable method can be used in the both ends pressure difference signal Vds of detection pair side rectifying tube S2.Certainly, state detection circuit
May have other detection methods and structure.The first comparison circuit or trigger circuit T1 are coupled with the first input end of door AND
Output end for receiving signal CP, couple the output end of the second comparison circuit COM2 for connecing with the second input terminal of door AND
Status signal Sta is received, the input terminal with the output end coupling pulse-generating circuit 226 of door AND.When the output of trigger circuit T1 is believed
It is effective with door AND output when the output signal Sta of number CP and state detection circuit 225 is that effective status is such as high level
Secondary side rectifying tube S2 is connected in the signal of state, the overvoltage protection signal OVP that pulse-generating circuit 226 exports effective status.?
In one embodiment, the effective status of signal is high level state, and the invalid state of signal is low level state.In another reality
It applies in example, pulse-generating circuit includes and door AND.In this way, secondary side rectifying tube S2 and primary side switch S1 are simultaneously turned on, primary side winding
Electric current IL on Wp is by abnormal raising, to trigger the overcurrent protection of primary circuit to stop primary-side-control circuit or primary side switch
The work of S1 makes system stalls, realizes overvoltage protection.In the illustrated embodiment, primary circuit further comprises overcurrent
Detection circuit, over-current detection circuit is in the output overcurrent protection signal when the electric current for flowing through primary side winding is more than third threshold value
OCPFault acts primary side switch S1 shutdown switch or primary-side-control circuit is made to stop working, by the overcurrent for triggering primary side
System is protected in protection.In the illustrated embodiment, over-current detection circuit includes third comparison circuit COM3, is used for table
The detection signal Vcs of sign primary side winding electric current IL is compared with third threshold signal Vth3, when current detection signal Vcs is greater than
When third threshold signal Vth3, comparison circuit COM3 exports effective overcurrent protection signal OCPFault, opens for turning off primary side
It closes S1 or primary-side-control circuit is made to stop working.System can restart after the predetermined time.
In an embodiment as illustrated in figure 3, secondary side control circuit 221 further comprise synchronous commutating control circuit 32 and/or
Door OR.Synchronous commutating control circuit 32 is for exporting synchronous rectification signal SR.In one embodiment, when detecting the rectification of secondary side
When pipe flows through electric current, synchronous rectification signal SR is transformed to high level state.Or the first input end coupling synchronous rectification letter of door OR
The control of the output end coupling pair side rectifying tube S2 of the second input terminal coupling overvoltage protection signal OVP or door of number SR or door OR
End.When any one signal in synchronous rectification signal SR or overvoltage protection signal OVP is high level state or door OR is exported
Signal PWM be high level state, secondary side rectifying tube S2 is connected.
The secondary rectifying tube S2 when control circuit 221 can further comprise described secondary.In one embodiment, secondary side rectifying tube
S2 includes switch type transistor, as metal oxide semiconductor field effect tube (MOSFET) or technotron (JFET) are managed.
Fig. 4 shows another secondary side rectifying tube D control mode according to an embodiment of the invention.In this embodiment,
The secondary rectifying tube when control circuit 221 does not include secondary, and further comprise a second switch S3, wherein secondary side rectifying tube includes non-
Synchronous rectifier such as diode D, the both ends that second switch S3 is connected across rectifier diode D are used for second switch S3 and rectification two
Pole pipe D is connected in parallel.In this control, secondary side control circuit 221 can not include synchronous commutating control circuit and described or door.
Fig. 5 shows the signal waveforms in 3 circuit of corresponding diagram according to an embodiment of the invention.It is respectively from top to bottom
Voltage sense signal Vs, signal CP, primary side switch driving signal DRV, synchronous rectification signal SR, rectifying tube pressure difference signal
Vds, state detection signal Sta, overvoltage protection signal OVP, secondary side rectifying tube driving signal PWM, primary side winding current detecting letter
Number Vcs and primary side overcurrent protection signal OCPFault.Before time t 1, output voltage Vo is lower than threshold voltage, i.e. output electricity
Pressure detection signal Vs replaces lower than first threshold signal Vth1, primary side switch driving signal DRV and pair side synchronous rectification signal SR
There is effective status, isolated power converting circuit works normally.Signal Vs, which is detected, in time t1, output voltage Vo is higher than first
Threshold signal Vth1, the first comparison circuit COM1 export high level signal, and triggering trigger circuit T1 exports high level signal CP.?
Time t2, primary side driving signal DRV become high level, primary side switch S1 conducting, and rectifying tube pressure difference signal Vds is greater than second threshold
Vth2, status signal Sta are transformed to high level.Therefore overvoltage protection signal OVP exports high level pulse, secondary side driving signal
There is high level pulse in PWM.So that primary side switch S1 and pair side rectifying tube S2 are simultaneously turned on, the detection letter of primary side winding electric current IL
Number Vcs, which rises, there is point punching.It is higher than threshold signal Vth3, triggering overcurrent protection letter in time t3, primary side winding current signal Vcs
Number OCPFault becomes effective status, to turn off primary side switch and/or primary-side-control circuit.
In this fashion, secondary circuit is when detecting output voltage over-voltage, by detecting the signal on secondary side as rectified
Pipe pressure difference signal Vds further detects the turn-on instant of primary side switch pipe, secondary side rectifying tube S2 is connected, to realize over-voltage
Protection control.And in this fashion, when secondary side rectifying tube S2 is switched on, the Over Current Protection System of automatic trigger primary side from
And realize overvoltage protection, without increasing additional detection circuit or control circuit in primary side, do not increase additional function in primary side
Energy and circuit, can be with existing various primary-side-control circuit compatibilities.
Fig. 6 shows secondary side control circuit schematic diagram according to an embodiment of the invention.Wherein pair side control circuit SRIC
With first port RGND and second port HV, first port RGND couples the first end of pair side rectifying tube S2.First end RGND
It can be the anode tap of the asynchronous rectifier diode of source terminal or secondary side of secondary synchronous rectifier S2.Second port HV couples secondary side
The second end of rectifying tube S2.Second port HV can be the asynchronous rectifier diode of drain electrode end or secondary side of secondary synchronous rectifier S2
Cathode terminal.First port RGND can be used as the benchmark port of secondary side control circuit SRIC, in this way, second port HV voltage and
Signal inside secondary side control circuit SRIC is substantially each letter using the voltage of benchmark port RGND as ground level is referred to
Difference signal number with first port RGND voltage, wherein the value of second port HV signal is the voltage at the secondary side both ends rectifying tube S2
Difference, or the drain source voltage for synchronous rectifier S2.In one embodiment, secondary side rectifying tube is as upper tube, first port RGND
Vice-side winding Ws is coupled, second port HV couples the output end vo of secondary circuit.In another embodiment, secondary side rectifying tube is made
For down tube, SGND, second port HV couple vice-side winding to first port RGND with coupling secondary side reference.
Secondary side control circuit SRIC includes overvoltage protective module 222.Secondary side control circuit SRIC can also further comprise same
Walk rectifier control circuit 32 and/or door OR.Wherein overvoltage protective module 222 includes the first comparison circuit COM1, state detection circuit
225 and pulse-generating circuit 226.Overvoltage protective module 222 can also further comprise trigger circuit T1 and with door AND, wherein touching
The input terminal of Power Generation Road T1 couples the output end of the first comparison circuit COM1, is respectively coupled to trigger circuit T1's with the input terminal of door
The output end of output end and state detection circuit 225.
Wherein state detection circuit 225 includes the second comparison circuit COM2, the first input end of the second comparison circuit COM2
Second port HV is coupled, the second input terminal of the second comparison circuit couples second threshold signal Vth2, when second port HV voltage
When greater than second threshold signal Vth2, state detection circuit exports effective value signal for allowing overvoltage protection signal that secondary side is connected
Rectifying tube S2.Here " permission " is only one of the condition for needing to meet, but does not represent and secondary side rectifying tube is connected immediately.Whether lead
Logical pair side rectifying tube will also see whether signal CP is effective status simultaneously.
Overvoltage protective module 222 can also further comprise that sampling hold circuit 61 is used to carry out the voltage of second port HV
Sampling and holding, make its output end signal reflect system output voltage Vo.Sampling hold circuit 61 includes sampling switch S3 and electricity
Hold C1, wherein the first end of sampling switch S3 couples second port HV, and the second end coupling capacitance C1 of sampling switch S3 is for mentioning
For characterizing the detection signal of output voltage and further coupling the first input end of the first comparison circuit COM1；First comparison circuit
The second input terminal of COM1 couples threshold signal Vth1.
The sampling hold circuit 61 of overvoltage protective module 222 can further comprise sampling control module 611, output end coupling
Connect the control terminal of sampling switch S3.In one embodiment, sampling control module 611 receives synchronous commutating control circuit 32 and exports
Synchronous rectification signal SR, for detect secondary side rectifying tube S2 terminate rectification predetermined time after be connected sampling switch S3.
In one embodiment, sampling control module 611 is connected after detecting that secondary side rectifying tube S2 terminates rectification 50-400 microsecond and adopts
Sample switch S3.Since after pair side rectifying tube S2 terminates the predetermined time of rectification, the second end of pair side control circuit SRIC at this time
Mouth HV voltage (the first port RGND voltage relative to secondary side control circuit SRIC) can correctly reflect isolated power conversion electricity
The actual output voltage Vo on road.
Fig. 7 shows the waveform diagram of 6 circuit of corresponding diagram according to an embodiment of the invention.In time t1, signal SR
Decline, synchronous rectifier stop rectification, and the time point t2 after predetermined time Δ t is sampled and kept to HV signal.By
In the rising of output voltage Vo, HV signal also rises in the time, therefore samples and signal VC is kept also to rise in sampling time point t2
Height, so that the detection signal VC of output voltage is more than first threshold signal Vth1, so that trigger circuit T1 exports high level
Signal CP.In time point t3, DRV signal is increased, and primary side switch conducting, signal HV also rises to over second threshold signal
Vth2, so that the effective status for the status signal Sta output high level that state detection circuit 225 exports.So that over-voltage is protected
It protects signal OVP and exports high level, the control signal PWM of secondary side rectifying tube is also high level, so that secondary side rectifying tube S2 be connected.Make
It obtains primary side switch S1 and pair side rectifying tube S2 is simultaneously turned on, cause primary current IL overcurrent to trigger primary side overcurrent protection signal
OCPFault is in effective status, to realize the protection to system.
In another embodiment, secondary side control circuit SRIC can further have third port, for coupling isolation
The output end vo of formula power circuit.Wherein the first port RGND of pair side control circuit SRIC can be used for coupling the pair of secondary circuit
Side is with reference to ground, and the second port HV of secondary side control circuit SRIC is for coupling vice-side winding, and secondary side rectifying tube is as down tube.This
When, the output voltage Vo of the direct sampled output of overvoltage protective module 222 is used for and first threshold signal Vth1 is compared, and
It does not need to include sampling hold circuit.
Fig. 8 shows the side according to an embodiment of the invention to isolated switching circuit offer output voltage overvoltage protection
Method schematic process flow diagram.The method comprising the steps of 801-805.In step 801, output voltage Vo, tool are detected by secondary circuit
Output voltage Vo is detected to body by secondary side control circuit.In one embodiment, it is secondary while control circuit with it is secondary while for reference
Ground, the output voltage for detecting secondary circuit is the voltage of directly detection secondary circuit output end.In another embodiment, secondary
While control circuit signal with it is secondary while rectifying tube source terminal be with reference to ground, the output voltage for detecting secondary circuit is included in secondary side
The drain-source pressure difference of secondary side rectifying tube is detected after the predetermined time that rectifying tube terminates synchronous rectification, so that drain-source pressure difference reflects at this time
The output voltage of isolated switching circuit.
In step 802, judge whether output voltage is greater than first threshold, if more than first threshold, illustrates isolated switch
The output voltage over-voltage of circuit needs to carry out overvoltage protection, enters step 803.Otherwise return step 802 continue to test output
Voltage Vo.
In step 803, the state of monitoring switch circuit.In one embodiment, the state of monitoring switch circuit includes prison
Whether the pressure difference for surveying secondary side rectifying tube both ends is greater than second threshold.When secondary side rectifying tube both ends pressure difference be greater than second threshold, say
Bright primary side switch conducting.In step 804, when monitoring that output voltage is greater than first threshold and monitors that switching circuit state meets
When predetermined condition, the pressure difference for such as working as secondary side rectifying tube both ends is greater than second threshold, then secondary side rectifying tube is connected, for producing in primary side
Raw fault-signal.
Primary circuit is set to stop working when primary circuit senses fault-signal in step 805.In one embodiment
In, when secondary side rectifying tube and primary side switch simultaneously turn on, there is point punching in primary side winding electric current, and primary circuit senses failure letter
It number is by sensing primary side winding electric current greater than third threshold value, to trigger the overcurrent protection mechanism of primary circuit to realize
, to realize the overcurrent protection by triggering primary circuit to realize that the over-voltage of isolated switching circuitry output is protected indirectly
Shield.In this way, primary circuit without increase it is additional detect and control circuit, reduce the complexity of primary circuit, and have simultaneously
There are accurate over-voltage detection and over-voltage control.In one embodiment, secondary side control circuit is an independent IC chip.
Primary-side-control circuit can also be an independent IC chip.In this way, it is only necessary to modify to secondary side control circuit chip or
Replace the secondary side output that high accuracy high reliability of the invention can be realized without mating modification primary-side-control circuit chip
Electric voltage over press protection.
Description and application of the invention herein are illustrative, is not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, the realities for those skilled in the art
The replacement and equivalent various parts for applying example are well known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case where, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and component are realized.Without departing from the scope and spirit of the present invention, can to embodiments disclosed herein into
The other deformations of row and change.
Claims (17)
1. a kind of secondary side control circuit for isolated power converting circuit, including overvoltage protective module, overvoltage protective module
For providing protection, overvoltage protection to isolated power converting circuit in the output voltage over-voltage of isolated power converting circuit
Module includes:
First comparison circuit, for comparing the detection signal and first threshold signal of characterization output voltage；
State detection circuit determines the transformation of isolated power converting circuit based on the secondary side signal of isolated power converting circuit
State；And
Pulse-generating circuit, the transition state selection of comparison result and isolated power converting circuit based on the first comparison circuit
Property output over-voltage protection signal secondary side rectifying tube is connected.
2. pair side as described in claim 1 control circuit, in which:
Secondary side control circuit has first port and second port, and first port couples the source terminal or anode tap of secondary side rectifying tube
And the benchmark port as secondary side control circuit, second port couple the drain electrode end or cathode terminal of secondary side rectifying tube；
State detection circuit includes the second comparison circuit, and the first input end of the second comparison circuit couples second port, the second ratio
The second input terminal compared with circuit couples second threshold signal, when second port voltage is greater than second threshold signal, state-detection
The effective value signal of circuit output is for allowing overvoltage protection signal that secondary side rectifying tube is connected.
3. pair side as claimed in claim 2 control circuit, wherein overvoltage protective module include with door, wherein defeated with the first of door
The output end for entering the first comparison circuit of end coupling, the output end of the second comparison circuit is coupled with the second input terminal of door, when with door
When exporting high level signal, secondary side rectifying tube is connected in the overvoltage protection signal of pulse-generating circuit output effective status.
4. pair side as described in claim 1 control circuit, wherein secondary side control circuit has first port and second port, the
Single port couples the first end of secondary side rectifying tube, and second port couples the second end of secondary side rectifying tube, and overvoltage protective module is into one
Step includes:
Sampling hold circuit, including sampling switch and capacitor, wherein the first end of sampling switch couples second port, sampling switch
Second end coupling capacitance be used for provides characterization output voltage detection signal, sampling switch second end coupling the first comparison it is electric
The first input end on road；Second input terminal of the first comparison circuit couples first threshold signal；And
Sampling control module, the control terminal of the output end coupling sampling switch of sampling control module.
5. pair side as claimed in claim 4 control circuit, wherein sampling control module is detecting that it is whole that secondary side rectifying tube terminates
Sampling switch is connected after the predetermined time of stream.
6. pair side as described in claim 1 control circuit, wherein when the detection signal of characterization output voltage is greater than first threshold
When signal and primary side switch conducting, secondary side rectifying tube is connected in the overvoltage protection signal of pulse-generating circuit output effective status.
7. pair side as described in claim 1 control circuit, wherein overvoltage protective module further comprises: trigger circuit, triggering
The set input of circuit couples the output end of the first comparison circuit, and the output end of trigger circuit couples pulse-generating circuit.
8. pair side as described in claim 1 control circuit, further comprises:
Synchronous commutating control circuit exports synchronous rectification signal；And
Or the second input terminal of the first input end coupling synchronous rectification signal or door of door or door couples overvoltage protection signal, or
The output end of door couples the control terminal of secondary side rectifying tube.
9. pair side as described in claim 1 control circuit, further comprises the secondary side rectifying tube, secondary side rectifying tube includes opening
Close transistor npn npn.
10. pair side as described in claim 1 control circuit, further comprises second switch, wherein secondary side rectifying tube includes two
Pole pipe, the both ends that second switch is connected across rectifier diode are used for and rectifier diode is connected in parallel.
11. a kind of secondary side control circuit for isolated power converting circuit, wherein isolated power converting circuit includes original
Side circuit and secondary circuit, primary circuit receive input voltage, and primary circuit includes primary side winding and primary side switch；Secondary circuit
Including vice-side winding and secondary side control circuit, vice-side winding and primary side winding coupling composition transformer, secondary circuit provide isolation
The output voltage of formula power converting circuit, wherein secondary side control circuit includes overvoltage protective module, overvoltage protective module is being detected
To isolated power converting circuit output voltage greater than after predetermined threshold and when primary side switch conducting, a pulse signal control is exported
Secondary side rectifying tube conducting is made, for triggering overcurrent protection in primary circuit.
12. such as the described in any item isolated power converting circuits of claim 1-11.
13. isolated power converting circuit as claimed in claim 12, wherein primary circuit further comprises over-current detection electricity
Road, over-current detection circuit when flow through primary side winding electric current be more than third threshold value when output overcurrent protection signal primary side is opened
Shut down only switch motion.
14. a kind of for providing the method for output voltage overvoltage protection to isolated switching circuit, comprising:
Secondary circuit detects output voltage；
Judge whether output voltage is greater than first threshold；
The state of monitoring switch circuit；
When output voltage is greater than first threshold and monitors that switching circuit state meets predetermined condition, secondary side rectifying tube is connected,
For generating fault-signal in primary side；
When primary circuit senses fault-signal, primary circuit is made to stop working.
15. method as claimed in claim 14, wherein the state of monitoring switch circuit includes: to monitor secondary side rectifying tube both ends
Whether pressure difference is greater than second threshold, when the pressure difference that output voltage is greater than first threshold and secondary side rectifying tube both ends is greater than second threshold
When, secondary side rectifying tube is connected.
16. method as claimed in claim 14, wherein detection output voltage includes terminating synchronous rectification in secondary side rectifying tube
The drain-source pressure difference of secondary side rectifying tube is detected after predetermined time.
17. method as claimed in claim 14, it includes that primary circuit was triggered that wherein primary circuit, which senses fault-signal,
Stream protection.
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| CN201811457109.2A CN109347066B (en) | 2018-11-30 | 2018-11-30 | Secondary control circuit, isolated power conversion circuit and overvoltage protection method thereof |
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| CN201811457109.2A CN109347066B (en) | 2018-11-30 | 2018-11-30 | Secondary control circuit, isolated power conversion circuit and overvoltage protection method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861566A (en) * | 2019-03-28 | 2019-06-07 | 南京和若源电气有限公司 | A kind of circuit of synchronous rectification, synchronous rectification method and wireless charging device |
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| CN111668813A (en) * | 2020-07-08 | 2020-09-15 | 深圳市必易微电子有限公司 | Overvoltage protection circuit and overvoltage protection method of switching power supply and switching power supply |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004343966A (en) * | 2003-05-19 | 2004-12-02 | Sony Corp | Current resonance switching power circuit |
| CN101051743A (en) * | 2007-02-02 | 2007-10-10 | 艾默生网络能源有限公司 | Over-temperature protection method for transformer in reverse exciting topological power and its application circuit |
| CN101728958A (en) * | 2008-11-03 | 2010-06-09 | 成都芯源系统有限公司 | Method and control device for controlling isolated converter by tail current |
| CN102195492A (en) * | 2011-05-24 | 2011-09-21 | 成都芯源系统有限公司 | Synchronous rectification switching power supply and control circuit and control method thereof |
| CN102231605A (en) * | 2011-06-30 | 2011-11-02 | 上海新进半导体制造有限公司 | Synchronous rectification control circuit of switch power supply secondary and flyback switch power supply |
| JP2012205356A (en) * | 2011-03-24 | 2012-10-22 | Sharp Corp | Rectification switch unit, rectification circuit, and switching power supply device |
| US20150049521A1 (en) * | 2013-08-14 | 2015-02-19 | Dora S.P.A. | Control device for a rectifier of a switching converter |
| CN105978341A (en) * | 2016-06-01 | 2016-09-28 | 西安矽力杰半导体技术有限公司 | Secondary side control circuit, secondary side control method, and fly-back converter adopting the same |
| CN106208720A (en) * | 2016-09-28 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Synchronous commutating control circuit, method and switch flyback switch circuit |
| CN107534389A (en) * | 2015-10-30 | 2018-01-02 | 三垦电气株式会社 | Switch the switching power unit and switching power unit integrated circuit of the setting of output voltage |
| CN206963166U (en) * | 2017-07-28 | 2018-02-02 | 北京波尔通达电子技术股份有限公司 | A kind of anti-high-voltage breakdown circuit for deuterium lamp |
| CN108667302A (en) * | 2017-03-28 | 2018-10-16 | 杰华特微电子（杭州）有限公司 | A kind of isolated switching circuit and its control method |
| CN209389697U (en) * | 2018-11-30 | 2019-09-13 | 深圳市必易微电子有限公司 | A kind of pair side control circuit and its isolated power converting circuit |
-
2018
- 2018-11-30 CN CN201811457109.2A patent/CN109347066B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004343966A (en) * | 2003-05-19 | 2004-12-02 | Sony Corp | Current resonance switching power circuit |
| CN101051743A (en) * | 2007-02-02 | 2007-10-10 | 艾默生网络能源有限公司 | Over-temperature protection method for transformer in reverse exciting topological power and its application circuit |
| CN101728958A (en) * | 2008-11-03 | 2010-06-09 | 成都芯源系统有限公司 | Method and control device for controlling isolated converter by tail current |
| JP2012205356A (en) * | 2011-03-24 | 2012-10-22 | Sharp Corp | Rectification switch unit, rectification circuit, and switching power supply device |
| CN102195492A (en) * | 2011-05-24 | 2011-09-21 | 成都芯源系统有限公司 | Synchronous rectification switching power supply and control circuit and control method thereof |
| CN102231605A (en) * | 2011-06-30 | 2011-11-02 | 上海新进半导体制造有限公司 | Synchronous rectification control circuit of switch power supply secondary and flyback switch power supply |
| US20150049521A1 (en) * | 2013-08-14 | 2015-02-19 | Dora S.P.A. | Control device for a rectifier of a switching converter |
| CN107534389A (en) * | 2015-10-30 | 2018-01-02 | 三垦电气株式会社 | Switch the switching power unit and switching power unit integrated circuit of the setting of output voltage |
| CN105978341A (en) * | 2016-06-01 | 2016-09-28 | 西安矽力杰半导体技术有限公司 | Secondary side control circuit, secondary side control method, and fly-back converter adopting the same |
| CN106208720A (en) * | 2016-09-28 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Synchronous commutating control circuit, method and switch flyback switch circuit |
| CN108667302A (en) * | 2017-03-28 | 2018-10-16 | 杰华特微电子（杭州）有限公司 | A kind of isolated switching circuit and its control method |
| CN206963166U (en) * | 2017-07-28 | 2018-02-02 | 北京波尔通达电子技术股份有限公司 | A kind of anti-high-voltage breakdown circuit for deuterium lamp |
| CN209389697U (en) * | 2018-11-30 | 2019-09-13 | 深圳市必易微电子有限公司 | A kind of pair side control circuit and its isolated power converting circuit |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861566A (en) * | 2019-03-28 | 2019-06-07 | 南京和若源电气有限公司 | A kind of circuit of synchronous rectification, synchronous rectification method and wireless charging device |
| CN110995222A (en) * | 2019-12-04 | 2020-04-10 | 华中科技大学 | Short-circuit protection device of GaN power switch device |
| CN110995222B (en) * | 2019-12-04 | 2022-02-18 | 华中科技大学 | Short-circuit protection device of GaN power switch device |
| CN113162441A (en) * | 2020-01-22 | 2021-07-23 | 杭州必易微电子有限公司 | Isolated power supply circuit, primary and secondary side communication control circuit and control method |
| CN111262563A (en) * | 2020-03-19 | 2020-06-09 | 湖南品腾电子科技有限公司 | Large current output circuit |
| CN111262563B (en) * | 2020-03-19 | 2023-09-08 | 湖南品腾电子科技有限公司 | High-current output circuit |
| CN111668813A (en) * | 2020-07-08 | 2020-09-15 | 深圳市必易微电子有限公司 | Overvoltage protection circuit and overvoltage protection method of switching power supply and switching power supply |
| CN115267591A (en) * | 2021-04-30 | 2022-11-01 | 台达电子企业管理（上海）有限公司 | Power supply working state detection method and detection device |
| CN113285607A (en) * | 2021-05-20 | 2021-08-20 | 深圳慧能泰半导体科技有限公司 | Isolated power supply circuit, control method of isolated power supply and isolated power supply |
| CN113872423A (en) * | 2021-09-22 | 2021-12-31 | 杰华特微电子股份有限公司 | Protection circuit, power adapter and control method of protection circuit |
| CN113872423B (en) * | 2021-09-22 | 2024-07-23 | 杰华特微电子股份有限公司 | Protection circuit, power adapter and control method of protection circuit |
| CN116073809A (en) * | 2023-03-23 | 2023-05-05 | 杭州飞仕得科技股份有限公司 | Pulse transformer signal bidirectional transmission device and protection method thereof |
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