CN108880274A - A kind of output current detection circuit of controlled resonant converter - Google Patents
A kind of output current detection circuit of controlled resonant converter Download PDFInfo
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- CN108880274A CN108880274A CN201710339542.5A CN201710339542A CN108880274A CN 108880274 A CN108880274 A CN 108880274A CN 201710339542 A CN201710339542 A CN 201710339542A CN 108880274 A CN108880274 A CN 108880274A
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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
- H02M3/22—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
- H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
- H02M3/3381—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement using a single commutation path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
-
- 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
- H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention belongs to LED light control technology fields, the present invention provides a kind of output current detection circuit of controlled resonant converter, output current detection circuit includes two secondary windings, drive module, four controllable switches of transformer, when the first controllable switch is in the conductive state according to external control signal, the Same Name of Ends output electric current of current transformer vice-side winding successively passes through the 5th controllable module, inspection leakage resistance, ground terminal, the 4th controllable resistor；When the second controllable switch is in the conductive state according to external control signal, the different name end of current transformer vice-side winding exports induced current, and successively by the controllable module of third, inspection leakage resistance, ground terminal and the 6th controllable resistor, solve the problems, such as LLC converter existing in the prior art work driving voltage and corresponding output electric current is asynchronous leads to not detection output electric current when switching frequency is greater than resonance frequency, the present disclosure applies equally to the output electric current measures within the scope of the topological line frequency for the national games of LCC.
Description
Technical field
The present invention relates to LED light control technology field more particularly to a kind of output current detection circuits of controlled resonant converter.
Background technique
LLC converter is when work is in Fs (switching frequency)≤Fr (resonance frequency) in the prior art, driving voltage and opposite
The output electric current answered be it is synchronous, can using driving bridge circuit in switching tube driving signal come driving transformer pair side
Switching tube, exported with detecting transformer secondary to the electric current of LED light.
When the work of LLC converter is in Fs (switching frequency) > Fr (resonance frequency), driving voltage and corresponding output electricity
Stream be it is nonsynchronous, when driving voltage is zero, there are also electric currents.So cannot be driven using the driving signal of primary side MOS
The switching tube of dynamic transformer secondary, is detected at this point, cannot export to transformer secondary to the electric current of LED.
In addition, in LCC converter topology structure primary side switching tube driving with output electric current be it is nonsynchronous, so existing
There is also cannot be rectified with the switching tube driving signal of primary side to detect the output electric current on secondary side in technology.
Summary of the invention
The purpose of the present invention is to provide a kind of output current detection circuits of controlled resonant converter, are able to solve the prior art
Present in LLC converter work switching frequency be greater than resonance frequency when driving voltage and corresponding output electric current it is asynchronous
The problem of leading to not detection output electric current, the switch of primary side cannot be used by being also able to solve LCC converter presence in the prior art
Pipe driving signal is rectified the problem of to detect the output electric current on secondary side.
The invention is realized in this way first aspect present invention provides a kind of output electric current inspection of output current detection circuit
Slowdown monitoring circuit, the output current detection circuit include the first controllable switch, the second controllable switch, resonance modules, transformer, electric current
Mutual inductor, drive module and inspection leakage resistance, the output current detection circuit includes the third secondary windings of the transformer
With the 4th secondary windings, drive module, third controllable switch, the 4th controllable switch, the 5th controllable switch, the 6th controllable switch with
And the current transformer vice-side winding；
The input terminal of first controllable switch connects input voltage with the input terminal of second controllable switch, and described
The control terminal of one controllable switch connects external control signal, first controllable switch with the control terminal of second controllable switch
Output end connect the input terminal of the resonance modules and the output end of second controllable switch, the output of the resonance modules
End connects the armature winding of the transformer, and the Same Name of Ends of the first secondary windings of the transformer connects the current transformer
The first primary side winding Same Name of Ends, the different name end of the first primary side winding of the current transformer connects the current transformer
The second primary side winding Same Name of Ends, and constitute the first output end of the output current detection circuit, the of the transformer
The different name end of one secondary windings connects the Same Name of Ends of the second subprime winding of the transformer, and constitutes the output electric current measure
The different name end of the second output terminal of circuit, the second subprime winding of the transformer connects the second primary side of the current transformer
The different name end at the different name end of winding, the third secondary windings of the transformer connects the first input end of the drive module, institute
The Same Name of Ends for stating the 4th secondary windings of transformer connects the second input terminal of the drive module, and the first of the drive module
Output end connects the control terminal of the third controllable switch and the 6th controllable switch, the second output terminal of the drive module
The control terminal of the 4th controllable switch and the 5th controllable switch is connected, the input terminal of the third controllable switch connects institute
State inspection leakage resistance first end and the 5th controllable switch input terminal, the third controllable switch output end connection described in
The different name end of the input terminal of 4th controllable switch and the current transformer vice-side winding, the output end of the 5th controllable switch
Connect the input terminal of the 6th controllable switch and the Same Name of Ends of the current transformer vice-side winding, the third of the transformer
The Same Name of Ends of secondary windings, the different name end of the 4th secondary windings of the transformer, the second end of the inspection leakage resistance, described the
The output end common ground connection of the output end of four controllable switches and the 6th controllable switch, wherein the first of the transformer
Secondary windings and the 4th secondary windings Same Name of Ends having the same, the second subprime winding of the transformer and the third
Secondary windings Same Name of Ends having the same；
When first controllable switch is in the conductive state according to external control signal, second controllable switch is according to outer
When portion's control signal is in an off state, the Same Name of Ends of the armature winding of the transformer inputs forward voltage, the transformer
The first secondary windings the first primary side winding from Same Name of Ends to the current transformer Same Name of Ends output voltage, the transformation
4th secondary windings of device controls the 4th controllable switch by the drive module and the 5th controllable switch is connected, institute
State current transformer vice-side winding Same Name of Ends output induced current, and successively by the 5th controllable module, inspection leakage resistance,
The different name end of ground terminal, the 4th controllable resistor and the current transformer vice-side winding；
When first controllable switch is in an off state according to external control signal, second controllable switch is according to outer
When portion's control signal is in the conductive state, the different name end of the armature winding of the transformer inputs forward voltage, the transformer
Second subprime winding the second primary side winding from Same Name of Ends to the current transformer different name end output voltage, the transformation
The third secondary windings of device controls the third controllable switch by the drive module and the 6th controllable switch is connected, institute
State the different name end output induced current of current transformer vice-side winding, and successively by the controllable module of the third, inspection leakage resistance,
The Same Name of Ends of ground terminal, the 6th controllable resistor and the current transformer vice-side winding.
With reference to first aspect, as the first embodiment of first aspect, first controllable switch is the first N-type
Metal-oxide-semiconductor, the grid of the first N-type metal-oxide-semiconductor, source electrode and drain electrode be the control terminal of first controllable switch, input terminal with
And output end；
Second controllable switch is the second N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the second N-type metal-oxide-semiconductor are
Control terminal, output end and the input terminal of first controllable switch.
With reference to first aspect, as second of embodiment of first aspect, the third controllable switch is third N-type
Metal-oxide-semiconductor, the grid of the third N-type metal-oxide-semiconductor, source electrode and drain electrode be the control terminal of the third controllable switch, input terminal with
And output end；
4th controllable switch is the 4th N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the 4th N-type metal-oxide-semiconductor are
Control terminal, input terminal and the output end of 4th controllable switch；
5th controllable switch is the 5th N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the 5th N-type metal-oxide-semiconductor are
Control terminal, input terminal and the output end of 5th controllable switch；
6th controllable switch is the 6th N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the 6th N-type metal-oxide-semiconductor are
Control terminal, input terminal and the output end of 5th controllable switch.
With reference to first aspect, as the third embodiment of first aspect, the first output end of the driving circuit with
Current-limiting resistance R54 is additionally provided between the control terminal of the third controllable switch.
With reference to first aspect, as the 4th kind of embodiment of first aspect, the second output terminal of the driving circuit with
Current-limiting resistance R55 is additionally provided between the control terminal of 4th controllable switch.
With reference to first aspect, as the 5th kind of embodiment of first aspect, the output current detection circuit further includes
CP capacitor, the CP capacitor are connected in parallel on the both ends of the armature winding of the transformer.
With reference to first aspect, as the 6th kind of embodiment of first aspect, the output current detection circuit further includes
CP capacitor, the first end of the CP capacitor connect the Same Name of Ends of the first secondary windings of the transformer, and the of the CP capacitor
Two ends connect the different name end of the second subprime winding of the transformer.
The present invention provides a kind of output current detection circuit of controlled resonant converter, increases by two secondary on the secondary side of transformer
Winding drives the turn-on and turn-off of third controllable switch, the 4th controllable switch, the 5th controllable switch and the 6th controllable switch,
Wherein, the turn-on and turn-off of the control of third secondary windings third controllable switch and the 6th controllable switch, the control of the 4th secondary windings
The turn-on and turn-off of 4th controllable switch and the 5th controllable switch, the Same Name of Ends phase of third secondary windings and the first secondary windings
Together, two winding common actions, the 4th secondary windings is identical as the Same Name of Ends of second subprime winding, which moves jointly
Make, Same Name of Ends output voltage from the Same Name of Ends of the first secondary windings of transformer to the first primary side winding of current transformer when,
Third secondary windings controls the conducting of third controllable switch and the 6th controllable switch simultaneously, makes current transformer, third mode-controller
Block, inspection leakage resistance, ground terminal and the 6th controllable switch form access, at this point, can detect the current detecting in the circuit pathways
Electric current is exported, the Same Name of Ends of the second subprime winding of transformer exports electricity to the different name end of the second primary side winding of current transformer
When pressure, the 4th secondary windings controls the 4th controllable switch and the conducting of the 5th controllable switch, makes current transformer, the 5th mode-controller
Block, inspection leakage resistance, ground terminal and the 4th controllable switch form access, at this point, can detect the current detecting in the circuit pathways
Electric current is exported, the synchronous detection to output electric current is realized, solves LLC converter work existing in the prior art in switch frequency
Rate be greater than resonance frequency when driving voltage and corresponding output electric current it is asynchronous lead to not detection export electric current the problem of.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the output current detection circuit for LLC converter that the embodiment of the present invention one provides；
Fig. 2 is a kind of circuit diagram of the output current detection circuit for LLC converter that the embodiment of the present invention one provides；
Fig. 3 is a kind of structural schematic diagram of the output current detection circuit of LCC converter provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of partial circuit diagram of the output current detection circuit of LCC converter provided by Embodiment 2 of the present invention；
Fig. 5 is a kind of structural schematic diagram of the output current detection circuit for LCC converter that the embodiment of the present invention three provides；
Fig. 6 is a kind of partial circuit diagram of the output current detection circuit for LCC converter that the embodiment of the present invention three provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In order to illustrate technical solution of the present invention, the following is a description of specific embodiments.
The embodiment of the present invention one provides a kind of output current detection circuit of LLC converter, as shown in Figure 1, output electric current
Detection circuit includes the first controllable switch 101, the second controllable switch 102, resonance modules 103, transformer, current transformer, drive
Dynamic model block 111 and inspection leakage resistance 112, output current detection circuit include transformer third secondary windings 109 and the 4th time
Grade winding 110, drive module 111, third controllable switch 113, the 4th controllable switch 114, the 5th controllable switch the 116, the 6th can
Control switch 117 and current transformer vice-side winding 115；
The input terminal of the input terminal of first controllable switch 101 and the second controllable switch 102 connects input voltage, and first is controllable
The control terminal of switch 101 connects external control signal with the control terminal of the second controllable switch 102, the first controllable switch 101 it is defeated
Outlet connects the input terminal of resonance modules 103 and the output end of the second controllable switch 102, the output end connection of resonance modules 103
The armature winding 104 of transformer, the first secondary windings 105 of transformer Same Name of Ends connection current transformer the first primary side around
The Same Name of Ends of group 106, the second primary side winding of the different name end connection current transformer of the first primary side winding 106 of current transformer
108 Same Name of Ends, and the first output end of output current detection circuit is constituted, the different name of the first secondary windings 105 of transformer
The Same Name of Ends of the second subprime winding 107 of end connection transformer, and constitute the second output terminal of output current detection circuit, transformation
The different name end of second primary side winding 108 of the different name end connection current transformer of the second subprime winding 107 of device, the of transformer
Three secondary windings 109 different name end connection drive module 111 first input end, the 4th secondary windings 110 of transformer it is same
Second input terminal of name end connection drive module 111, the first output end of drive module 111 connect 113 He of third controllable switch
The 4th controllable switch 114 and the 5th of second output terminal connection of the control terminal of 6th controllable switch 117, drive module 111 is controllable
The control terminal of switch 116, the first end and the 5th controllable switch of the input terminal connection inspection leakage resistance 112 of third controllable switch 113
116 input terminal, the output end of third controllable switch 113 connect the input terminal and current transformer pair of the 4th controllable switch 114
The different name end of side winding 115, the input terminal and electric current of output end the 6th controllable switch 117 of connection of the 5th controllable switch 116 are mutual
The Same Name of Ends of sensor vice-side winding 115, the 4th secondary windings of the Same Name of Ends of the third secondary windings 109 of transformer, transformer
110 different name end, the second end for examining leakage resistance 112, the output end of the 4th controllable switch 114 and the 6th controllable switch 117
Output end common ground connection, wherein the first secondary windings 105 and the Same Name of Ends having the same of the 4th secondary windings 110 of transformer,
The second subprime winding 107 and the Same Name of Ends having the same of third secondary windings 109 of transformer；
When the first controllable switch 101 is in the conductive state according to external control signal, the second controllable switch 102 is according to outside
When control signal is in an off state, the Same Name of Ends of the armature winding 104 of transformer inputs forward voltage, the first time of transformer
Grade winding 105 the first primary side winding 106 from Same Name of Ends to current transformer Same Name of Ends output voltage, the 4th time of transformer
Grade winding 110 controls the 4th controllable switch 114 and the conducting of the 5th controllable switch 116, current transformer pair by drive module 111
The Same Name of Ends of side winding 115 exports induced current, and successively by the 5th controllable module, inspection leakage resistance 112, ground terminal, the 4th
The different name end of controllable resistor and current transformer vice-side winding 115；
When the first controllable switch 101 is in an off state according to external control signal, the second controllable switch 102 is according to outside
When control signal is in the conductive state, the different name end input forward voltage of the armature winding 104 of transformer, second of transformer
Grade winding 107 the second primary side winding 108 from Same Name of Ends to current transformer different name end output voltage, the third time of transformer
Grade winding 109 controls third controllable switch 113 and the conducting of the 6th controllable switch 117, current transformer pair by drive module 111
The different name end of side winding 115 exports induced current, and successively by the controllable module of third, inspection leakage resistance 112, ground terminal, the 6th
The Same Name of Ends of controllable resistor and current transformer vice-side winding 115.
The embodiment of the present invention increases by two secondary windings on the secondary side of transformer to drive third controllable switch, the 4th controllably
The turn-on and turn-off of switch, the 5th controllable switch and the 6th controllable switch, wherein third secondary windings control third is controllably opened
It closes and the turn-on and turn-off of the 6th controllable switch, the 4th secondary windings controls the conducting of the 4th controllable switch and the 5th controllable switch
And shutdown, third secondary windings is identical as the Same Name of Ends of the first secondary windings, two winding common actions, the 4th secondary windings
It is identical as the Same Name of Ends of second subprime winding, two winding common actions, the Same Name of Ends of the first secondary windings of transformer to
When the Same Name of Ends output voltage of the first primary side winding of current transformer, third secondary windings control simultaneously third controllable switch and
The conducting of 6th controllable switch makes the controllable module of current transformer, third, inspection leakage resistance, ground terminal and the 6th controllable switch
Formed access, at this point, can detect in the circuit pathways current detecting output electric current, the second subprime winding of transformer it is of the same name
When holding to the different name end output voltage of the second primary side winding of current transformer, the 4th secondary windings control the 4th controllable switch and
The conducting of 5th controllable switch makes current transformer, the 5th controllable module, inspection leakage resistance, ground terminal and the 4th controllable switch shape
At access, at this point, can detect the current detecting output electric current in the circuit pathways, the synchronous detection to output electric current is realized,
Solve LLC converter existing in the prior art work driving voltage and corresponding defeated when switching frequency is greater than resonance frequency
Electric current asynchronous the problem of leading to not detection output electric current out.
As shown in Fig. 2, the embodiment of the present invention is specifically described below by specific circuit structure：
For the first controllable switch 101, specifically, the first controllable switch 101 is the first N-type metal-oxide-semiconductor M40, the first N-type
Grid, source electrode and the drain electrode of metal-oxide-semiconductor M40 are control terminal, input terminal and the output end of the first controllable switch 101；
For the second controllable switch 102, specifically, the second controllable switch 102 is the second N-type metal-oxide-semiconductor M41, the second N-type
Grid, source electrode and the drain electrode of metal-oxide-semiconductor M41 are control terminal, output end and the input terminal of the second controllable switch 102.
For third controllable switch 113, specifically, third controllable switch 113 is third N-type metal-oxide-semiconductor Q50, third N-type
Grid, source electrode and the drain electrode of metal-oxide-semiconductor Q50 are control terminal, input terminal and the output end of third controllable switch 113.
For the 4th controllable switch 114, specifically, the 4th controllable switch 114 is the 4th N-type metal-oxide-semiconductor Q52, the 4th N-type
Grid, source electrode and the drain electrode of metal-oxide-semiconductor Q52 are control terminal, input terminal and the output end of the 4th controllable switch 114.
For the 5th controllable switch 116, specifically, the 5th controllable switch 116 is the 5th N-type metal-oxide-semiconductor Q51, the 5th N-type
Grid, source electrode and the drain electrode of metal-oxide-semiconductor Q51 are control terminal, input terminal and the output end of the 5th controllable switch 116；
For the 6th controllable switch 117, specifically, the 6th controllable switch 117 is the 6th N-type metal-oxide-semiconductor Q52, the 6th N-type
Grid, source electrode and the drain electrode of metal-oxide-semiconductor Q52 are control terminal, input terminal and the output end of the 6th controllable switch 117.
Wherein, inspection leakage resistance R54 is additionally provided between the first output end of driving circuit and the control terminal of third controllable switch,
Inspection leakage resistance R55 is additionally provided between the second output terminal of driving circuit and the control terminal of the 4th controllable switch.
The Same Name of Ends 4 of the armature winding of transformer L51 connects the second end of capacitor C51, and the different name end 2 of armature winding connects
Ground, the first end connection second end of capacitor C42 of capacitor C51, the first end of capacitor C43, the first N-type metal-oxide-semiconductor M40 source electrode,
The drain electrode of second N-type metal-oxide-semiconductor M41, the second end of resistance R42, the collector of triode Q40, inductance L40 different name end 6 and
The first end of resistance R43C, the drain electrode of the first N-type metal-oxide-semiconductor M40 and the first end of capacitor C42 simultaneously constitute input terminal 400VDC, the
The cathode of the grid connection first end of resistance R42 of one N-type metal-oxide-semiconductor M40, the first end of resistance R41 and diode D40, electricity
Hinder the emitter of the second end connecting triode Q40 of R41, the anode and resistance of the base stage connection diode D40 of triode Q40
The second end of R40, the second end of the first end connection capacitor C41 of resistance R40, the first end connection inductance L40's of capacitor C41 is same
The different name end 4 at name end 1, inductance L40 is grounded, the second end of the connection of the Same Name of Ends 3 capacitor C40 of inductance L40, and the first of capacitor C40
The first end of the second end connection resistance R43B of end connection input terminal OUTHS, resistance R43C, the second end of resistance R43B connect electricity
The first end of R43A is hindered, the first end of the second end connection resistance R45 of resistance R43A simultaneously constitutes input terminal IHB, and the of resistance R45
Two ends connect the source electrode of the second N-type metal-oxide-semiconductor M41 and the first end of resistance R47, the second end ground connection of resistance R47, the second N-type MOS
The second end of the grid connection resistance R44 of pipe M41, the first end of resistance R44 connect input terminal OUTLS, input terminal VSNS connection
The first end of resistance R51 and the first end of resistance R52, the first end and inductance L50 of the second end connection capacitor C55 of resistance R51
First end, inductance L50 second end connection diode D50 cathode, diode D50 anode connection inductance L51 it is of the same name
End 10, the second end at the different name end 9 of inductance L51, the second end of capacitor C55 and resistance R52 are connected to ground altogether, and input terminal PE1 connects
The first end of capacitor C02 and the first end of capacitor C69, the second end ground connection of capacitor C02 are connect, the second end of capacitor C69 connects electricity
Feel the first end of L68, the different name end 7 of the first secondary windings of the second end connection transformer L51 of inductance L68, second subprime around
The second end of the Same Name of Ends 6, the second end of capacitor C54, the second end of capacitor C53 and the capacitor C52 that organize, the first secondary windings
Same Name of Ends 8 connects the anode of voltage-stabiliser tube D52A, the first primary side winding of the cathode connection current transformer L52 of voltage-stabiliser tube D52A
Same Name of Ends 10, the different name end 7 of the first primary side winding of current transformer L52 connect the second primary side winding of current transformer L52
Same Name of Ends 6, the first end of capacitor C54, the first end of the first end of capacitor C53 and capacitor C52, current transformer L52's
The different name end 9 of second primary side winding connects the cathode of voltage-stabiliser tube D52B, and the anode of voltage-stabiliser tube D52B connects the second of transformer L51
The different name end 5 of secondary windings, the drain electrode and the 5th of the first end, third N-type metal-oxide-semiconductor Q50 of input terminal ISNS connection resistance R33
The drain electrode of N-type metal-oxide-semiconductor Q51, the different name end 3 of the third secondary windings of transformer L51 connect the first input of driving circuit 120
End, the Same Name of Ends 10 of the 4th secondary windings of transformer L51 connect the second input terminal of driving circuit 120, driving circuit 120
First output end connects the first end of resistance R54, the grid and the 6th N of the second end connection third N-type metal-oxide-semiconductor Q50 of resistance R54
The grid of type metal-oxide-semiconductor Q53, the first end of the second output terminal connection resistance R55 of driving circuit 120, the second end of resistance R55 connect
The grid of the 4th N-type metal-oxide-semiconductor Q52 and the grid of the 5th N-type metal-oxide-semiconductor Q51 are connect, the source electrode of third N-type metal-oxide-semiconductor Q50 connects electric current
The drain electrode at the different name end 4 of the vice-side winding of mutual inductor L52, the first end of resistance R56 and the 4th N-type metal-oxide-semiconductor Q52, electric current are mutual
The Same Name of Ends 2 of the vice-side winding of sensor L52 connects the source electrode and the 6th N of the second end of resistance R56, the 5th N-type metal-oxide-semiconductor Q51
The drain electrode of type metal-oxide-semiconductor Q53, the Same Name of Ends 1 of the third secondary windings of transformer L51, the third secondary windings of transformer L51 it is different
Name end 9, the second end of resistance R33, the source electrode of the 4th N-type metal-oxide-semiconductor Q52 and the source electrode common ground connection of the 6th N-type metal-oxide-semiconductor Q53.
The concrete operating principle of circuit structure provided by the invention is：
Increase the third secondary windings of two secondary windings transformers on main transformer and the 4th secondary windings passes through drive
Dynamic circuit drives third N-type metal-oxide-semiconductor Q50, the 5th N-type metal-oxide-semiconductor Q51, the 4th N-type metal-oxide-semiconductor Q52 and the 6th N-type metal-oxide-semiconductor
The pin PIN3 of Q53, third secondary windings are passed through by output signal B, the pin PIN10 of the 4th secondary windings after driving circuit
The complete phase of pin PIN10 signal logic level of output signal A after driving circuit, signal A and the 4th secondary windings of transformer
Together, signal B is identical with the pin PIN3 signal logic level of third secondary windings of transformer.
When the first N-type metal-oxide-semiconductor M40 conducting, the pin PIN4 voltage of primary winding is positive, relative strain
The pin PIN8 voltage of first secondary windings of depressor is positive, and PIN7 voltage is negative, the pin PIN10 of the 4th secondary windings and
The pin PIN8 of one secondary windings is Same Name of Ends, so the pin of the pin PIN10 of the 4th secondary windings and the first secondary windings
The logic level of PIN8 is synchronous.When the pin PIN8 of the first secondary windings is positive voltage, the 4th secondary windings
Pin PIN10 is also positive voltage, and electric current flows to PIN7, Current Mutual Inductance from the PIN10 of the first primary side winding of current transformer L52
The electric current that the vice-side winding of device L52 induces is flowed out from pin PIN2, is flowed into from pin PIN4, at this point, due to the 4th grade
The pin PIN10 voltage of winding is positive, then the 5th N-type metal-oxide-semiconductor Q51, the 4th N-type metal-oxide-semiconductor Q52 are conducting, induced current stream
To for current transformer L52 vice-side winding PIN2, the 5th N-type metal-oxide-semiconductor Q51, resistance R33, the 4th N-type metal-oxide-semiconductor Q52, electricity
The vice-side winding PIN4 of current transformer L52.
When the second N-type metal-oxide-semiconductor M41 conducting, the PIN2 voltage of primary winding is positive, relative strain depressor
The pin PIN5 voltage of second subprime winding be positive, PIN6 voltage is negative, the pin PIN5 and third time of second subprime winding
The pin PIN3 of grade winding is Same Name of Ends, the logic of the pin PIN3 of the pin PIN5 and third secondary windings of second subprime winding
Level be it is synchronous, when second subprime winding pin PIN5 be positive voltage when, the pin PIN3 of third secondary windings
It is positive voltage.Electric current flows to PIN6 from the PIN9 of the second vice-side winding of current transformer L52, and current transformer L52 is induced
The electric current come is flowed into from the PIN4 outflow of the vice-side winding of current transformer L52, PIN2, due to drawing for third secondary windings at this time
Foot PIN3 voltage is positive, and third N-type metal-oxide-semiconductor Q50 and the 6th N-type metal-oxide-semiconductor Q53 are conductings, and inductive current direction flow direction is
The vice-side winding PIN4 of current transformer L52, third N-type metal-oxide-semiconductor Q50, resistance R33, the 6th N-type metal-oxide-semiconductor Q53 and electricity
The vice-side winding PIN2 of current transformer L52.
Through overtesting, from measured waveform as can be seen that the invention circuit is applied in LCC topology, PIN10 (L51) voltage
Signal is also synchronous with output electric current, therefore this circuit can be equally used for the output electric current measure of LCC topology.
The invention circuit can be used for (Fs in LLC topology whole frequency range<Fr, Fs=Fr, Fs > Fr) output electric current
Detection, and the invention circuit can be used for the output electric current measure of LCC topology.
The embodiment of the present invention two and embodiment three provide a kind of output current detection circuit of LCC converter, such as Fig. 3 and figure
Shown in 4, the difference from embodiment 1 is that on the basis of example 1 further include CP capacitor 120, CP electricity for the present embodiment two
Hold the both ends for the armature winding that 120 are connected in parallel on transformer.As shown in Figure 5 and Figure 6, the difference of the present embodiment three and embodiment one
Be on the basis of example 1 to further include CP capacitor 121, first grade of the first end of CP capacitor 121 connection transformer around
The Same Name of Ends of group, the second end of CP capacitor connect the different name end of the second subprime winding of the transformer.
When the circuit that embodiment two and embodiment three provide is applied within the scope of LCC topology line frequency for the national games, transformer
The voltage signal of third secondary windings and the 4th secondary windings with output electric current be it is synchronous, therefore, which can be used for LCC
Output electric current measure within the scope of topology line frequency for the national games.The above content is the specific preferred embodiments of combination to institute of the present invention
The further description of work is, and it cannot be said that specific implementation of the invention is only limited to these instructions.For skill belonging to the present invention
For the those of ordinary skill in art field, several equivalent substitutes or obvious change are made without departing from the inventive concept of the premise
Type, and performance or use is identical, all shall be regarded as belonging to present invention patent protection determined by the appended claims
Range.
Claims (7)
1. a kind of output current detection circuit of controlled resonant converter, which is characterized in that the output current detection circuit includes the
One controllable switch, the second controllable switch, resonance modules, transformer, current transformer, drive module and inspection leakage resistance, it is described
Output current detection circuit include the transformer third secondary windings and the 4th secondary windings, drive module, third it is controllable
Switch, the 4th controllable switch, the 5th controllable switch, the 6th controllable switch and the current transformer vice-side winding；
The input terminal of first controllable switch connects input voltage with the input terminal of second controllable switch, and described first can
The control terminal of control switch connects external control signal with the control terminal of second controllable switch, first controllable switch it is defeated
Outlet connects the input terminal of the resonance modules and the output end of second controllable switch, and the output end of the resonance modules connects
The armature winding of the transformer is connect, the Same Name of Ends of the first secondary windings of the transformer connects the of the current transformer
The Same Name of Ends of one primary side winding, the different name end of the first primary side winding of the current transformer connect the of the current transformer
The Same Name of Ends of two primary side windings, and constitute the first output end of the output current detection circuit, the first time of the transformer
The different name end of grade winding connects the Same Name of Ends of the second subprime winding of the transformer, and constitutes the output current detection circuit
Second output terminal, the different name end of the second subprime winding of the transformer connects the second primary side winding of the current transformer
Different name end, the different name end of the third secondary windings of the transformer connects the first input end of the drive module, the change
The Same Name of Ends of 4th secondary windings of depressor connects the second input terminal of the drive module, the first output of the drive module
End connects the control terminal of the third controllable switch and the 6th controllable switch, the second output terminal connection of the drive module
The input terminal of the control terminal of 4th controllable switch and the 5th controllable switch, the third controllable switch connects the inspection
The input terminal of the first end of leakage resistance and the 5th controllable switch, the output end connection the described 4th of the third controllable switch
The different name end of the input terminal of controllable switch and the current transformer vice-side winding, the output end connection of the 5th controllable switch
The third of the input terminal of 6th controllable switch and the Same Name of Ends of the current transformer vice-side winding, the transformer is secondary
The Same Name of Ends of winding, the different name end of the 4th secondary windings of the transformer, the inspection leakage resistance second end, the described 4th can
Control the output end of switch and the output end common ground connection of the 6th controllable switch, wherein first grade of the transformer
Winding and the 4th secondary windings Same Name of Ends having the same, the second subprime winding of the transformer and the third are secondary
Winding Same Name of Ends having the same；
When first controllable switch is in the conductive state according to external control signal, second controllable switch is controlled according to outside
When signal processed is in an off state, the Same Name of Ends of the armature winding of the transformer inputs forward voltage, and the of the transformer
The first primary side winding from the Same Name of Ends of one secondary windings to the current transformer Same Name of Ends output voltage, the transformer
4th secondary windings controls the 4th controllable switch by the drive module and the 5th controllable switch is connected, the electricity
The Same Name of Ends of current transformer vice-side winding exports induced current, and successively by the 5th controllable module, inspection leakage resistance, ground connection
It holds, the different name end of the 4th controllable resistor and the current transformer vice-side winding；
When first controllable switch is in an off state according to external control signal, second controllable switch is controlled according to outside
When signal processed is in the conductive state, the different name end of the armature winding of the transformer inputs forward voltage, and the of the transformer
The second primary side winding from the Same Name of Ends of secondary stage winding to the current transformer different name end output voltage, the transformer
Third secondary windings controls the third controllable switch by the drive module and the 6th controllable switch is connected, the electricity
The different name end of current transformer vice-side winding exports induced current, and successively by the controllable module of the third, inspection leakage resistance, ground connection
The Same Name of Ends at end, the 6th controllable resistor and the current transformer vice-side winding.
2. output current detection circuit as described in claim 1, which is characterized in that first controllable switch is the first N-type
Metal-oxide-semiconductor, the grid of the first N-type metal-oxide-semiconductor, source electrode and drain electrode be the control terminal of first controllable switch, input terminal with
And output end；
Second controllable switch is the second N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the second N-type metal-oxide-semiconductor are described
Control terminal, output end and the input terminal of first controllable switch.
3. output current detection circuit as described in claim 1, which is characterized in that the third controllable switch is third N-type
Metal-oxide-semiconductor, the grid of the third N-type metal-oxide-semiconductor, source electrode and drain electrode be the control terminal of the third controllable switch, input terminal with
And output end；
4th controllable switch is the 4th N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the 4th N-type metal-oxide-semiconductor are described
Control terminal, input terminal and the output end of 4th controllable switch；
5th controllable switch is the 5th N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the 5th N-type metal-oxide-semiconductor are described
Control terminal, input terminal and the output end of 5th controllable switch；
6th controllable switch is the 6th N-type metal-oxide-semiconductor, and grid, source electrode and the drain electrode of the 6th N-type metal-oxide-semiconductor are described
Control terminal, input terminal and the output end of 5th controllable switch.
4. output current detection circuit as described in claim 1, which is characterized in that the first output end of the driving circuit with
Current-limiting resistance R54 is additionally provided between the control terminal of the third controllable switch.
5. output current detection circuit as described in claim 1, which is characterized in that the second output terminal of the driving circuit with
Current-limiting resistance R55 is additionally provided between the control terminal of 4th controllable switch.
6. output current detection circuit as described in claim 1, which is characterized in that the output current detection circuit further includes
CP capacitor, the CP capacitor are connected in parallel on the both ends of the armature winding of the transformer.
7. output current detection circuit as described in claim 1, which is characterized in that the output current detection circuit further includes
CP capacitor, the first end of the CP capacitor connect the Same Name of Ends of the first secondary windings of the transformer, and the of the CP capacitor
Two ends connect the different name end of the second subprime winding of the transformer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339542.5A CN108880274A (en) | 2017-05-15 | 2017-05-15 | A kind of output current detection circuit of controlled resonant converter |
| PCT/CN2018/086637 WO2018210200A1 (en) | 2017-05-15 | 2018-05-14 | Output-current measurement circuit for resonant converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339542.5A CN108880274A (en) | 2017-05-15 | 2017-05-15 | A kind of output current detection circuit of controlled resonant converter |
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| CN108880274A true CN108880274A (en) | 2018-11-23 |
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| CN201710339542.5A Pending CN108880274A (en) | 2017-05-15 | 2017-05-15 | A kind of output current detection circuit of controlled resonant converter |
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| WO (1) | WO2018210200A1 (en) |
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| WO2018210200A1 (en) | 2018-11-22 |
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