USRE37510E1 - Self-synchronized drive circuit for a synchronized rectifier in a clamped-mode power converter - Google Patents
Self-synchronized drive circuit for a synchronized rectifier in a clamped-mode power converter Download PDFInfo
- Publication number
- USRE37510E1 USRE37510E1 US09/244,624 US24462498A USRE37510E US RE37510 E1 USRE37510 E1 US RE37510E1 US 24462498 A US24462498 A US 24462498A US RE37510 E USRE37510 E US RE37510E
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- US
- United States
- Prior art keywords
- synchronous rectifier
- voltage
- winding
- power converter
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- This invention relates to synchronous rectification and to a power converter employing synchronous rectification. It is particularly concerned with a self synchronized rectifier combined with a converter.
- a converter is a power processing circuit, that may have an input-output transformer isolation, that operates to convert an input voltage waveform with a DC component into an output DC voltage waveform.
- the presence of an isolation transformer requires the use of a rectifier circuit in the converter output circuit to perform the waveform conversion.
- the traditional rectifier uses rectifying diodes that conduct the load current only when forward biased in response to the input waveform.
- some rectifiers i.e. synchronous rectifiers
- the diodes are replaced by controlled switches that are periodically biased into conduction and nonconduction in synchronism with the periodic waveform to be rectified.
- self-synchronized synchronous rectifiers the biasing of the synchronous switches is supplied directly from a secondary winding of a transformer without requiring a separate drive to activate the synchronous switches.
- Self-synchronized synchronous rectifiers come in many forms, all designed to meet specified operating constraints. The challenge, in each instance, is to devise synchronous rectifier circuitry that is efficient (i.e. has low power dissipation) in performing the rectification process.
- the specific circuit topology of the synchronous rectifier is dependent in large part on the converter type being used and its operating characteristics (i.e. hard switched rs. soft switched).
- Application of self synchronized synchronous rectifiers to hard switched buck derived converter topologies, for example, is limited by a variable transformer reset voltage that often causes the voltage across the transformer windings to be essentially zero during a portion of each switching cycle.
- the voltages of the secondary winding may vary over a substantial range and there is the possibility of insufficient drive voltage for a rectifier that is conducting, causing it to operate in either a dissipative mode or a cut-off mode. This deficiency is quite likely for converters that deliver low output voltages.
- a power converter with a self-synchronized rectifier that includes one or two drive windings that do not carry load current but instead drive the control electrode(s) of one or both controlled rectifier switches (FETs).
- the drive winding(s) are connected in such a way that the switched devices rectify the periodic voltage waveform present at the secondary winding of the power transformer of the converter, with the turns of the drive winding(s) selected to provide sufficient drive signal levels under all operating conditions of input voltage and load.
- Additional switches may be connected in series with the control electrodes of the rectifier switches to limit the applied voltage. This drive circuit ensures that the drive voltage is always large enough to bias the proper synchronous-rectifier switch conducting, but not so large that it damages the switch or dissipates excessive power.
- an extra winding is included in the power transformer, and each of its leads is connected to the control electrode of one synchronous-rectifier switch.
- a separate drive transformer is provided to supply the gate drive signals.
- one or two extra windings are included in die power transformer and for each one, one lead is connected to the secondary winding and the other is connected to a voltage-limiting switch, of a series connection of two voltage limiting switches which is connected to the control electrode of a synchronous-rectifier switch.
- FIG. 1 is a schematic of a clamped forward converter with a drive for a self synchronized synchronous rectifier
- FIG. 2 is a graph of waveforms to assist in describing the operation of the converter of FIG. 1;
- FIG. 3 through 14 are schematics of other versions of a self synchronized synchronous rectifier, embodying the principles of the invention.
- FIG. 15 is a clamped forward converter with an alternate drive for a self-synchronized synchronous rectifier.
- FIG. 16 is a generalized circuit diagram embodying the principles introduced in FIG. 15 .
- a power converter such as shown in FIG. 1, includes a main FET power switch 101 connected to and periodically switched to enable an input DC voltage to be applied to the primary winding 112 of the power transformer 102 .
- An auxiliary switch 103 and a capacitor 107 connected in series and placed in shunt connection with the power switch 101 operates to clamp the voltage level across the primary and secondary windings during non conducting intervals of the power switch 101 . This assures that a voltage exists at the transformer windings over the entire time of non-conduction of the main power switch to assure drive for synchronous rectifier devices connected in the secondary circuit.
- the secondary winding 111 is connected to two rectifier switches 105 and 106 which are controllably switched to rectify the periodic waveform supplied to the rectifier by the secondary winding 111 .
- a low pass filter including inductor 104 acts on the rectified waveform to supply the output voltage V out .
- a regulation control 121 senses the output voltage V out , via lead 127 , and controls the duty cycle of the main power switch 101 and auxiliary switch 103 , via the drive circuit 122 .
- the power transformer 102 includes a third or auxiliary winding 110 having a winding polarity so that its voltage is utilized to appropriately drive the FET synchronous rectifier switches 105 and 106 .
- Drive to the FET synchronous rectifier switches 105 and 106 is applied through the drain-source path of the gate drive FET devices 109 and 108 respectively.
- the drive level is determined by the turn ratio of the auxiliary winding 110 with respect to the primary winding 112 , selected to assure that there is sufficient drive for the gates of synchronous rectifier switches 105 and 106 over the entire operating cycle and permitted range of input voltage V in .
- the FET devices 108 and 109 limit the voltage applied to the gates of the synchronous rectifier switches 105 and 106 to reduce dissipative losses and to reduce the possibility of voltage overstress of the switches 105 and 106 .
- a voltage source V b is used to supply a bias voltage to the FET devices 108 and 109 .
- the operation of the converter may be readily understood through the following description and by reference to the voltage waveforms shown in the FIG. 2 .
- the power switch 101 is non-conducting and the auxiliary switch 103 is conducting with substantially zero impedance in its main conductive path.
- the voltages v 111 across winding 111 and v 110 across winding 110 (dotted ends are positive with respect to undotted ends) are determined by the respective turn ratios. Typically more turns am included in winding 110 to boost the synchronous-rectifier drive voltage above that available at winding 111 .
- Non-conductance of switch 108 clamps the voltage at the gate of switch 106 to a value determined by the difference between the DC bias voltage V b connected to the gate of switch 108 and the threshold voltage of the switch 109 .
- the switches 101 and 103 change state, after which switch 101 is non-conducting and switch 103 is conducting. For a short period during this interval, the drain-source channel of neither switch 105 or 106 is conducting and the output inductor current is conducted through the body diodes comprising a part of the switch of these devices.
- a negative voltage V in minus V c107 is impressed across the primary winding 111 of transformer 102 causing the voltage across the secondary winding 111 and auxiliary winding 110 to reverse.
- switch 108 is non-conducting and switch 109 is conducting.
- the negative voltage V 110 across winding 110 causes the gate to source capacitance of switch 106 to discharge through the body diode of switch 108 .
- the gate to source capacitance of switch 105 is charged and the enabled switch 105 and output inductor 104 carry the load current.
- Circuit resonances are produced by the switching in the circuit due to the interaction between parasitic capacitances and inductances of the circuit. These resonances cause tinging in the drain-to-source voltage waveforms of switches 105 and 106 and as shown by the waveforms of FIG. 2 as they change conductive states. Coupling of these tinging voltages, through the parasitic drain-to-gate capacitances of switches 105 and 106 could cause them to inappropriately conduct, however the bias circuit arrangement described herein causes negating voltages to be clamped across the gate to source terminals of switches 105 and 106 when they are normally non-conducting. Hence temporary voltage increases can not inadvertently turn on these devices and cause turn on losses that impair circuit efficiency.
- the circuit of FIG. 3 discloses a flyback converter having a drive winding on the power transformer.
- the output filter is connected to a tap in the power secondary winding to achieve both forward and flyback mode operation.
- the drive winding for the synchronous rectifiers is contained in a separate drive transformer rather than the power transformer 102 .
- the primary winding of the drive transformer 110 and a series connected capacitor (to block DC current) are connected across the power switch 101 .
- This drive circuit is shown in a forward converter in FIG. 5, a flyback converter in FIG. 6, and a converter with a tapped secondary winding in FIG. 7 .
- the drive transformer and capacitor are connected instead across a winding of the power transformer 102 .
- This drive configuration is shown for the same three basic converters, a forward converter in FIG. 8, a flyback converter in FIG. 9, and a converter with a tapped secondary winding in FIG. 10 .
- FIG. 11 is a schematic diagram that represents all nine of the aforementioned circuit variations; i.e., all combinations of three circuit topologies and three possible locations of the synchronous-rectifier drive winding.
- FIGS. 12 through 14 show part of the circuit of FIG. 11, to illustrate some further circuit variations that embody the principles of the invention and can be applied to any of the nine aforementioned circuits.
- the drive circuit in FIG. 12 accomplishes the same action as that in FIG. 11, but for a different kind of synchronous rectifier switch.
- This switch is biased conducting when the gate-to-source voltage is zero or positive, and it is biased nonconducting by a negative gate-to-source voltage.
- Diodes 121 and 122 which may be intrinsic to synchronous-rectifier switches 105 and 106 , limit the positive voltage applied to the gate electrodes of the switches.
- Switches 117 and 118 along with the voltage source V p , limit the negative voltage applied to the gate electrodes of 105 and 106 . In the embodiment shown in FIG.
- FETs 117 and 118 are p-channel enhancement-mode FETs, which turn on when the gate-to-source voltage is less than the negative threshold voltage of the device. These switches also contain intrinsic body diodes that conduct to permit turning on the corresponding synchronous-rectifier switch.
- FIGS. 13 and 14 show other variations on the circuit of FIG. 11, with either synchronous-rectifier switch replaced by A diode.
- synchronous-rectifier switch 105 in FIG. 11 can be replaced by diode 113 in FIG. 13, with capacitor 115 substituted for the gate-to-source capacitance of switch 105 .
- synchronous-rectifier switch 106 in FIG. 11 can be replaced by diode 114 in FIG. 14, with capacitor 116 substituted for the gate-to-source capacitance of switch 106 .
- These circuits operate in essentially the same manner as described previously for FIG. 1, except that a diode is conducting during one portion of the switching cycle instead of a synchronous-rectifier switch.
- FIG. 15 Another means of boosting the drive voltage for self-driven synchronous rectifiers is illustrated in FIG. 15 .
- the voltage available at the secondary power winding 211 is sufficient to drive one of the two synchronous-rectifier switches, 206 , but not to drive the other, switch 205 .
- the solution is to add drive winding 210 to the main power transformer 202 , with one lead connected to the secondary power winding 211 and the other lead connected in series with one or two voltage-limiting switches and the control electrode of synchronous-rectifier switch 205 .
- Gate-drive switches 209 and 209 are included as in FIG.
- New gate-drive switch 217 and new bias voltage V p are included to limit the “off” voltage applied to the gate of switch 205 during the time synchronous rectifier switch 206 is conducting.
- gate-drive current can flow through the body diode of p-channel FET 217 , but during turn-off, gate-drive current flows through the channel of switch 217 until its source voltage (between switches 209 and 217 ) falls to less than ⁇ V p minus the negative threshold voltage of switch 217 . This action protects the gate of synchronous-rectifier switch 205 from excessive negative voltage.
- FIG. 16 is a generalized diagram of the invention illustrated in FIG. 15, and a circuit suitable for the alternate type of synchronous-rectifier switch introduced in FIG. 12 .
- Both portions 211 and 219 of the power secondary winding may be present, yielding an isolated buck converter with a tapped secondary winding, or the turns of winding 219 may be set to zero, yielding a forward converter as in FIG. IS, or the turns of winding 211 may be set to zero, giving a flyback converter.
- the turns of either drive winding 210 or 218 may be set to zero if sufficient drive voltage is present for a particular design and range of operating conditions.
- switches 209 and 216 may be eliminated, and either of switches 209 and 217 may be eliminated, as long as the associated gate voltage is not excessive.
- switches 209 and 217 may be eliminated, as long as the associated gate voltage is not excessive.
- either synchronous-rectifier switch 205 or 206 may be replaced by a diode, if desired. Any of these circuit variations embodies the principles of the invention.
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- Dc-Dc Converters (AREA)
Abstract
Description
Claims (76)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/244,624 USRE37510E1 (en) | 1995-05-25 | 1998-12-17 | Self-synchronized drive circuit for a synchronized rectifier in a clamped-mode power converter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US08/452,560 US5590032A (en) | 1995-05-25 | 1995-05-25 | Self-synchronized drive circuit for a synchronous rectifier in a clamped-mode power converter |
US09/244,624 USRE37510E1 (en) | 1995-05-25 | 1998-12-17 | Self-synchronized drive circuit for a synchronized rectifier in a clamped-mode power converter |
Related Parent Applications (1)
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US08/452,560 Reissue US5590032A (en) | 1995-05-25 | 1995-05-25 | Self-synchronized drive circuit for a synchronous rectifier in a clamped-mode power converter |
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USRE37510E1 true USRE37510E1 (en) | 2002-01-15 |
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US08/452,560 Ceased US5590032A (en) | 1995-05-25 | 1995-05-25 | Self-synchronized drive circuit for a synchronous rectifier in a clamped-mode power converter |
US09/244,624 Expired - Lifetime USRE37510E1 (en) | 1995-05-25 | 1998-12-17 | Self-synchronized drive circuit for a synchronized rectifier in a clamped-mode power converter |
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US08/452,560 Ceased US5590032A (en) | 1995-05-25 | 1995-05-25 | Self-synchronized drive circuit for a synchronous rectifier in a clamped-mode power converter |
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US20090135634A1 (en) * | 2007-11-23 | 2009-05-28 | Power Mate Technology Co., Ltd. | Synchronous rectifier drive circuit |
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CN103580484A (en) * | 2012-07-30 | 2014-02-12 | 台达电子工业股份有限公司 | Synchronous rectification device and control method thereof |
CN103580484B (en) * | 2012-07-30 | 2015-10-21 | 台达电子工业股份有限公司 | Synchronous rectificating device and control method thereof |
US10199950B1 (en) | 2013-07-02 | 2019-02-05 | Vlt, Inc. | Power distribution architecture with series-connected bus converter |
US10594223B1 (en) | 2013-07-02 | 2020-03-17 | Vlt, Inc. | Power distribution architecture with series-connected bus converter |
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