US20010006471A1 - Self-regulated synchronous rectifier - Google Patents
Self-regulated synchronous rectifier Download PDFInfo
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- US20010006471A1 US20010006471A1 US09/725,847 US72584700A US2001006471A1 US 20010006471 A1 US20010006471 A1 US 20010006471A1 US 72584700 A US72584700 A US 72584700A US 2001006471 A1 US2001006471 A1 US 2001006471A1
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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
Definitions
- the invention relates to a self-regulated synchronous rectifier.
- the invention relates in particular to a self-regulated synchronous rectifier used in an AC/DC or DC/DC converter.
- the invention relates to a synchronous rectifier regulated by coupled winding or self-regulated by symmetrical or asymmetrical direct energy transfer.
- self-regulated synchronous rectifier also means “synchronous rectifier regulated by coupled winding”.
- Asymmetrical conversion systems including an initial voltage source discharging into a transformer primary connected in parallel with a main switch are known in the art.
- the secondary of the transformer is connected in cascade with a self-regulated synchronous rectifier and a filter.
- the output of the filter discharges a regulated DC voltage into an application.
- the role of the self-regulated synchronous rectifier is:
- An asymmetrical self-regulated synchronous rectifier includes two MOSFETs adapted to perform the above two functions.
- the asymmetrical self-regulated synchronous rectifier includes:
- a first MOSFET connected between the first secondary transformer end and the first output of the rectifier and having its gate connected to the second end of the secondary of the transformer
- a second MOSFET connected between the first output of the rectifier and the second output of the rectifier and having its gate connected to the first transformer end.
- the secondary voltage of the transformer controls the two MOSFETs.
- the voltage applied to the gate of the MOSFETs is too low or too high for optimum control of the MOSFETs, i.e. with an optimum control dynamic range which is most economical in terms of losses.
- the feasible power transferred is very low and for higher output voltages the dynamic range of the input voltage is small.
- One object of the present invention is to propose a self-regulated synchronous rectifier in which the gate is protected against gate overvoltages, allowing wide variation of the input voltage combined with optimum performance in terms of output current and voltage.
- the invention provides a self-regulated synchronous rectifier connected between a secondary transformer winding and an LC filter.
- the self-regulated synchronous rectifier includes two MOSFETs each having a gate connected in series with a gate protection circuit.
- each gate protection circuit includes a divider bridge and a switch connected in parallel with the divider bridge and having an open position and a closed position and the rectifier includes a control device for controlling the switches adapted to receive an input signal proportional to the input voltage of the rectifier and producing output signals for controlling the switches.
- the rectifier is connected between the secondary transformer winding, which has first and second transformer ends, and the LC filter, which has first and second filter inputs, and has:
- first and second rectifier inputs respectively connected to the first and second transformer ends
- first and second rectifier outputs the second rectifier output being connected to the second rectifier input
- a direct MOSFET connected between the first rectifier input and the first rectifier output and having a gate connected to the second rectifier input and in series with the gate protection circuit
- a freewheel MOSFET connected between the first rectifier output and the second rectifier output and having a gate connected to the first rectifier input and in series with the gate protection circuit.
- the secondary winding of the transformer includes first and second sub-windings of opposite phase, each of the sub-windings having first and second transformer ends, and an LC filter having first and second filter inputs.
- the self-regulated synchronous rectifier includes:
- first and second rectifier inputs respectively connected to the transformer ends of the first sub-winding defining a first subsystem
- first and second rectifier inputs respectively connected to the transformer ends of the second sub-winding defining a second subsystem
- first and second rectifier outputs the second rectifier output being connected to the second rectifier input of the first subsystem.
- One MOSFET is connected between the first rectifier input of the first subsystem and the first rectifier output and has a gate connected to the second rectifier input of the first subsystem and in series with the gate protection circuit.
- the other MOSFET is connected between the first rectifier input of the second subsystem and the first rectifier output and has a gate connected to the second rectifier input of the second subsystem and in series with the gate protection circuit.
- control device generates two output signals independent of each other and each signal controls one of the switches.
- control device generates two interdependent output signals and each signal controls one of the switches.
- the control device includes means for generating at least one threshold value and means for comparing the input signal proportional to the rectifier input voltage with the threshold value and the output signals are a function of the direction of the comparison between the input signal proportional to the rectifier input voltage and the threshold value.
- the rectifier can include voltage measuring means including a diode connected in series with a measurement capacitor between the second rectifier input and the first rectifier output and the input signal is taken off between the diode and the measurement capacitor.
- One advantage of the present invention results from the dynamic control of the gate voltage, enabling the voltage divider bridge to be short circuited or not, according to the transformer secondary voltage.
- the gate voltages of the MOSFETs are optimized to limit losses and retain an optimum switching dynamic range. Accordingly, for wide variations in the input voltage it is possible, at the same voltage, and with the same overall volume, to feed more power into a converter including a rectifier in accordance with the invention.
- FIG. 1 is a block diagram of an asymmetrical self-regulated synchronous rectifier according to the invention.
- FIG. 2 is a block diagram of one embodiment of an asymmetrical self-regulated synchronous rectifier according to the invention.
- FIG. 3 is a block diagram of a symmetrical self-regulated synchronous rectifier according to the invention.
- the invention relates to a symmetrical or asymmetrical self-regulated synchronous rectifier 1 .
- the asymmetrical self-regulated synchronous rectifier 1 shown in FIGS. 1 and 2 is connected between the secondary 2 of a transformer 3 and an LC filter 4 .
- the asymmetrical self-regulated synchronous rectifier 1 has first and second rectifier inputs 26 , 27 connected to first and second transformer ends 5 , 6 of the secondary winding 2 of the transformer 3 and first and second rectifier outputs 9 , 10 connected to first and second filter inputs 7 , 8 of the LC filter 4 .
- the second output of the rectifier 10 is connected to the second input of the rectifier 27 .
- the asymmetrical self-regulated synchronous rectifier conventionally includes:
- a direct MOSFET 11 connected between the first rectifier input 26 and the first rectifier output 9 ; the gate 12 of the MOSFET 11 is connected to the second rectifier input 27 ; the gate 12 is connected in series with a gate protection circuit 28 , and
- a freewheel MOSFET 14 connected between the first rectifier output 9 and the second rectifier output 10 ; the gate 15 of the freewheel MOSFET 14 is connected to the first rectifier input 26 ; the gate 15 is connected in series with a gate protection circuit 29 .
- each gate protection circuit 28 , 29 includes a divider 13 , 16 connected in parallel with a switch 17 , 18 having an open position and a closed position.
- the divider 13 , 16 constitutes a non-dissipative divider bridge.
- the reference numbers 13 and 14 refer to the divider bridges.
- the rectifier 1 further includes a device 19 for controlling the switches 17 , 18 .
- the control device 19 receives an input signal 20 proportional to the input voltage of the rectifier 1 and its output signals 21 , 22 control the switches 17 , 18 .
- the input signal 20 proportional to the voltage at the input of the rectifier 1 is generated by voltage measuring means 30 .
- the control device 19 further includes means for generating at least one threshold value and means for comparing the input signal 20 with the threshold value.
- the output signals 21 , 22 depend on the direction of the comparison between the input signal 20 and the threshold value.
- the asymmetrical rectifier in accordance with the invention operates as follows:
- the input voltage of the rectifier 1 takes various forms which, in the direct phase, for convenience, can be treated as a squarewave signal VR whose duty factor or frequency can be modulated and whose amplitude varies as a function of the voltage range chosen for the converter.
- the input voltage of the rectifier 1 is in fact the voltage across the secondary 2 of the transformer 3 and, in addition to supplying power to the application, is also used as a control signal for the MOSFETs 11 , 14 .
- the control device 19 compares the input signal 20 with the threshold value 25 .
- the threshold value 25 is a reference voltage.
- the reference voltage can be a voltage proportional to the regulated voltage at the output of the conversion system (filter output). That value is chosen as a function of the voltage level below which the gate voltage resulting from the reduction 13 of the input voltage of the rectifier 1 by the divider bridge is too low, causing high losses and MOSFET switching dynamic stress problems.
- the control device 19 opens the switch 17 and the gate voltage is limited by the divider bridge 13 .
- control device 19 closes the switch 17 and the input voltage of the rectifier 1 then passes directly to the gate of the direct MOSFET 11 .
- the gate of the freewheel MOSFET 14 is at a negative voltage equal to the voltage drop at the terminals of the direct MOSFET 11 .
- the gate of the freewheel MOSFET 14 is therefore protected against reverse voltages and the switch 18 can remain open, regardless of the amplitude of the input voltage of the rectifier, while the direct MOSFET 11 is turned on.
- the switch 18 remains open, regardless of the amplitude of the input voltage of the rectifier.
- threshold values 25 there can be several different threshold values 25 , for example one value dedicated to the direct MOSFET 11 and one value dedicated to the freewheel MOSFET 14 , with a view to optimizing the losses of each MOSFET of the rectifier according to the input voltage.
- control signals 21 , 22 can be generated in an interdependent manner or by two independent control circuits.
- the voltage measuring means 30 include a diode 23 connected in series with a measuring capacitor 24 and between the second rectifier input 27 and the first rectifier output 9 .
- the input signal 20 is taken off between said diode 23 and the measurement capacitor 24 .
- the diode 23 conducts during the positive half of the signal and powers the measurement capacitor 24 generating the input signal 20 proportional to the input voltage of the rectifier. During the negative half of the signal the value 20 measured during the positive half of the signal controls the switch 18 of the freewheel MOSFET 14 .
- FIG. 3 is a block diagram of a symmetrical self-regulated synchronous rectifier according to the invention.
- the two MOSFETs 11 , 14 transfer energy directly.
- the principle of operation of the rectifier is that of symmetrical direct energy transfer systems known to the skilled person.
- the detection and gate protection principles described for the asymmetrical system can be applied in full.
- the secondary winding 2 of the transformer 3 includes first and second sub-windings 2 a, 2 b with opposite phases, each sub-winding having first and second transformer ends 5 a, 6 a; 5 b, 6 b, and an LC filter 4 having first and second filter inputs 7 , 8 .
- the symmetrical self-regulated synchronous rectifier includes:
- first and second rectifier inputs 26 a , 27 a respectively connected to the transformer ends 5 a , 6 a of the first sub-winding 2 a defining a first subsystem
- first and second rectifier inputs 26 b, 27 b respectively connected to the transformer ends 5 b , 6 b of the second sub-winding 2 b defining a second subsystem
- first and second rectifier outputs 9 , 10 the second rectifier output 10 being connected to the second rectifier input 27 a of the first subsystem
- one MOSFET 11 connected between the first rectifier input 26 a of the first subsystem and the first rectifier output 9 and having its gate 12 connected to the second rectifier input 27 a of the first subsystem and in series with the gate protection circuit 28 , and
- the other MOSFET 14 connected between the first rectifier input 26 b of the second subsystem and the first rectifier output 9 and having its gate 15 connected to 25 the second rectifier input 27 b of the second subsystem and in series with the gate protection circuit 29 .
- the invention includes all means known in the art for measuring the input voltage of the rectifier or an equivalent, all means known in the art for comparing the measured value to a reference value and all means known in the art for short circuiting the divider bridge or bridges of the rectifier in accordance with predetermined rules as a function of the direction of the comparison.
Abstract
Description
- 1. Field of the Invention
- The invention relates to a self-regulated synchronous rectifier. The invention relates in particular to a self-regulated synchronous rectifier used in an AC/DC or DC/DC converter.
- The invention relates to a synchronous rectifier regulated by coupled winding or self-regulated by symmetrical or asymmetrical direct energy transfer. In the remainder of the text, the expression “self-regulated synchronous rectifier” also means “synchronous rectifier regulated by coupled winding”.
- 2. Description of the Prior Art
- Asymmetrical conversion systems including an initial voltage source discharging into a transformer primary connected in parallel with a main switch are known in the art. The secondary of the transformer is connected in cascade with a self-regulated synchronous rectifier and a filter. The output of the filter discharges a regulated DC voltage into an application. In a conversion system of the above type the role of the self-regulated synchronous rectifier is:
- to deliver to the application, via the filter, the energy transferred by the transformer in the on period of the main switch, and
- to block the transfer during the off period of the main switch, the application being powered by the coil of the filter during the off period of the main switch.
- An asymmetrical self-regulated synchronous rectifier includes two MOSFETs adapted to perform the above two functions. For example, the asymmetrical self-regulated synchronous rectifier includes:
- a first and a second output of the rectifier,
- a first MOSFET connected between the first secondary transformer end and the first output of the rectifier and having its gate connected to the second end of the secondary of the transformer, and
- a second MOSFET connected between the first output of the rectifier and the second output of the rectifier and having its gate connected to the first transformer end.
- The secondary voltage of the transformer controls the two MOSFETs.
- For economic reasons, manufacturers wish to develop converters accommodating a wide range of input voltage in one and the same product. This implies that the secondary voltage of the transformer also varies within a wide range. However, the secondary voltage of the transformer is also the signal at the gate of the MOSFETs of the rectifier. There are limits on the voltages that can be applied to the gates of MOSFETs. If too high a voltage is applied to the gate of a MOSFET, the MOSFET may be destroyed. Protecting MOSFETs from an overvoltage at the gate by connecting the gate in series with a passive voltage divider bridge is known in the art. However, the voltage divider causes high losses if the transformer secondary voltage is too low or too high. The voltage applied to the gate of the MOSFETs is too low or too high for optimum control of the MOSFETs, i.e. with an optimum control dynamic range which is most economical in terms of losses. As a result, for low output voltages, the feasible power transferred is very low and for higher output voltages the dynamic range of the input voltage is small.
- One object of the present invention is to propose a self-regulated synchronous rectifier in which the gate is protected against gate overvoltages, allowing wide variation of the input voltage combined with optimum performance in terms of output current and voltage.
- The invention provides a self-regulated synchronous rectifier connected between a secondary transformer winding and an LC filter.
- The self-regulated synchronous rectifier includes two MOSFETs each having a gate connected in series with a gate protection circuit.
- According to the invention, each gate protection circuit includes a divider bridge and a switch connected in parallel with the divider bridge and having an open position and a closed position and the rectifier includes a control device for controlling the switches adapted to receive an input signal proportional to the input voltage of the rectifier and producing output signals for controlling the switches.
- In an asymmetrical first embodiment the rectifier is connected between the secondary transformer winding, which has first and second transformer ends, and the LC filter, which has first and second filter inputs, and has:
- first and second rectifier inputs respectively connected to the first and second transformer ends,
- first and second rectifier outputs, the second rectifier output being connected to the second rectifier input,
- a direct MOSFET connected between the first rectifier input and the first rectifier output and having a gate connected to the second rectifier input and in series with the gate protection circuit, and
- a freewheel MOSFET connected between the first rectifier output and the second rectifier output and having a gate connected to the first rectifier input and in series with the gate protection circuit.
- In a symmetrical second embodiment the secondary winding of the transformer includes first and second sub-windings of opposite phase, each of the sub-windings having first and second transformer ends, and an LC filter having first and second filter inputs.
- The self-regulated synchronous rectifier includes:
- first and second rectifier inputs respectively connected to the transformer ends of the first sub-winding defining a first subsystem,
- first and second rectifier inputs respectively connected to the transformer ends of the second sub-winding defining a second subsystem, and
- first and second rectifier outputs, the second rectifier output being connected to the second rectifier input of the first subsystem.
- One MOSFET is connected between the first rectifier input of the first subsystem and the first rectifier output and has a gate connected to the second rectifier input of the first subsystem and in series with the gate protection circuit.
- The other MOSFET is connected between the first rectifier input of the second subsystem and the first rectifier output and has a gate connected to the second rectifier input of the second subsystem and in series with the gate protection circuit.
- In one embodiment the control device generates two output signals independent of each other and each signal controls one of the switches.
- In another embodiment the control device generates two interdependent output signals and each signal controls one of the switches.
- The control device includes means for generating at least one threshold value and means for comparing the input signal proportional to the rectifier input voltage with the threshold value and the output signals are a function of the direction of the comparison between the input signal proportional to the rectifier input voltage and the threshold value.
- The rectifier can include voltage measuring means including a diode connected in series with a measurement capacitor between the second rectifier input and the first rectifier output and the input signal is taken off between the diode and the measurement capacitor.
- One advantage of the present invention results from the dynamic control of the gate voltage, enabling the voltage divider bridge to be short circuited or not, according to the transformer secondary voltage. Thus, whatever the amplitude of the input voltage of the self-regulated synchronous rectifier, the gate voltages of the MOSFETs are optimized to limit losses and retain an optimum switching dynamic range. Accordingly, for wide variations in the input voltage it is possible, at the same voltage, and with the same overall volume, to feed more power into a converter including a rectifier in accordance with the invention.
- Other advantages and features of the present invention will emerge from the following description, which is given with reference to the accompanying drawings.
- FIG. 1 is a block diagram of an asymmetrical self-regulated synchronous rectifier according to the invention.
- FIG. 2 is a block diagram of one embodiment of an asymmetrical self-regulated synchronous rectifier according to the invention.
- FIG. 3 is a block diagram of a symmetrical self-regulated synchronous rectifier according to the invention.
- The invention relates to a symmetrical or asymmetrical self-regulated
synchronous rectifier 1. - The asymmetrical self-regulated
synchronous rectifier 1 shown in FIGS. 1 and 2 is connected between the secondary 2 of atransformer 3 and anLC filter 4. - More particularly, the asymmetrical self-regulated
synchronous rectifier 1 has first and second rectifier inputs 26, 27 connected to first and second transformer ends 5, 6 of thesecondary winding 2 of thetransformer 3 and first and second rectifier outputs 9, 10 connected to first and second filter inputs 7, 8 of theLC filter 4. The second output of the rectifier 10 is connected to the second input of the rectifier 27. - The asymmetrical self-regulated synchronous rectifier conventionally includes:
- a
direct MOSFET 11 connected between the first rectifier input 26 and the first rectifier output 9; thegate 12 of theMOSFET 11 is connected to the second rectifier input 27; thegate 12 is connected in series with agate protection circuit 28, and - a
freewheel MOSFET 14 connected between the first rectifier output 9 and the second rectifier output 10; thegate 15 of thefreewheel MOSFET 14 is connected to the first rectifier input 26; thegate 15 is connected in series with agate protection circuit 29. - In accordance with the invention, each
gate protection circuit divider switch - In conjunction with the inherent capacitance or the impedance between the gate and the source of the MOSFET, the
divider reference numbers - The
rectifier 1 further includes adevice 19 for controlling theswitches control device 19 receives aninput signal 20 proportional to the input voltage of therectifier 1 and its output signals 21, 22 control theswitches - The
input signal 20 proportional to the voltage at the input of therectifier 1 is generated by voltage measuring means 30. - The
control device 19 further includes means for generating at least one threshold value and means for comparing theinput signal 20 with the threshold value. The output signals 21, 22 depend on the direction of the comparison between theinput signal 20 and the threshold value. - The asymmetrical rectifier in accordance with the invention operates as follows:
- Depending on the topology, the input voltage of the
rectifier 1 takes various forms which, in the direct phase, for convenience, can be treated as a squarewave signal VR whose duty factor or frequency can be modulated and whose amplitude varies as a function of the voltage range chosen for the converter. The input voltage of therectifier 1 is in fact the voltage across the secondary 2 of thetransformer 3 and, in addition to supplying power to the application, is also used as a control signal for theMOSFETs - In the positive half of the squarewave signal the
direct MOSFET 11 is turned on and thefreewheel MOSFET 14 is turned off. Theinput signal 20 proportional to the voltage at the input of therectifier 1 is generated by voltage measuring means 30. - The
control device 19 compares theinput signal 20 with thethreshold value 25. Thethreshold value 25 is a reference voltage. For example, the reference voltage can be a voltage proportional to the regulated voltage at the output of the conversion system (filter output). That value is chosen as a function of the voltage level below which the gate voltage resulting from thereduction 13 of the input voltage of therectifier 1 by the divider bridge is too low, causing high losses and MOSFET switching dynamic stress problems. - For input voltages of the
rectifier 1 higher than the threshold value, thecontrol device 19 opens theswitch 17 and the gate voltage is limited by thedivider bridge 13. - For input voltages of the
rectifier 1 below the threshold value thecontrol device 19 closes theswitch 17 and the input voltage of therectifier 1 then passes directly to the gate of thedirect MOSFET 11. - During the positive half of the squarewave signal VR the gate of the
freewheel MOSFET 14 is at a negative voltage equal to the voltage drop at the terminals of thedirect MOSFET 11. The gate of thefreewheel MOSFET 14 is therefore protected against reverse voltages and theswitch 18 can remain open, regardless of the amplitude of the input voltage of the rectifier, while thedirect MOSFET 11 is turned on. To ensure that the absolute value of the gate voltage remains below the threshold at which the MOSFET may be destroyed, theswitch 18 remains open, regardless of the amplitude of the input voltage of the rectifier. - During the negative half of the squarewave signal the
freewheel MOSFET 14 is turned on and thedirect MOSFET 11 is turned off. The gate of thefreewheel MOSFET 14 is therefore at a positive voltage. The operation described for the positive half of the signal is then interchanged between thedirect MOSFET 11 and thefreewheel MOSFET 14. - There can be several different threshold values25, for example one value dedicated to the
direct MOSFET 11 and one value dedicated to thefreewheel MOSFET 14, with a view to optimizing the losses of each MOSFET of the rectifier according to the input voltage. - The control signals21, 22 can be generated in an interdependent manner or by two independent control circuits.
- In the embodiment shown in FIG. 2 the voltage measuring means30 include a
diode 23 connected in series with a measuringcapacitor 24 and between the second rectifier input 27 and the first rectifier output 9. Theinput signal 20 is taken off between saiddiode 23 and themeasurement capacitor 24. - The
diode 23 conducts during the positive half of the signal and powers themeasurement capacitor 24 generating theinput signal 20 proportional to the input voltage of the rectifier. During the negative half of the signal thevalue 20 measured during the positive half of the signal controls theswitch 18 of thefreewheel MOSFET 14. - FIG. 3 is a block diagram of a symmetrical self-regulated synchronous rectifier according to the invention. In this embodiment the two
MOSFETs - In this symmetrical embodiment the secondary winding2 of the
transformer 3 includes first andsecond sub-windings LC filter 4 having first and second filter inputs 7, 8. - The symmetrical self-regulated synchronous rectifier includes:
- first and
second rectifier inputs first sub-winding 2 a defining a first subsystem, - first and
second rectifier inputs second sub-winding 2 b defining a second subsystem, - first and second rectifier outputs9, 10, the second rectifier output 10 being connected to the
second rectifier input 27 a of the first subsystem, - one
MOSFET 11 connected between thefirst rectifier input 26 a of the first subsystem and the first rectifier output 9 and having itsgate 12 connected to thesecond rectifier input 27 a of the first subsystem and in series with thegate protection circuit 28, and - the
other MOSFET 14 connected between thefirst rectifier input 26 b of the second subsystem and the first rectifier output 9 and having itsgate 15 connected to 25 thesecond rectifier input 27 b of the second subsystem and in series with thegate protection circuit 29. - Of course, the invention is not limited to the embodiments described and shown and lends itself to many variants that will be evident to the skilled person and do not depart from the scope of the invention.
- In particular, the invention includes all means known in the art for measuring the input voltage of the rectifier or an equivalent, all means known in the art for comparing the measured value to a reference value and all means known in the art for short circuiting the divider bridge or bridges of the rectifier in accordance with predetermined rules as a function of the direction of the comparison.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0000007 | 2000-01-03 | ||
FR0000007A FR2803453B1 (en) | 2000-01-03 | 2000-01-03 | SELF-CONTROLLED SYNCHRONOUS RECTIFIER |
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US20010006471A1 true US20010006471A1 (en) | 2001-07-05 |
US6292380B2 US6292380B2 (en) | 2001-09-18 |
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US09/725,847 Expired - Lifetime US6292380B2 (en) | 2000-01-03 | 2000-11-30 | Self-regulated synchronous rectifier |
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US (1) | US6292380B2 (en) |
EP (1) | EP1115195B1 (en) |
AT (1) | ATE441963T1 (en) |
CA (1) | CA2326641C (en) |
DE (1) | DE60042876D1 (en) |
ES (1) | ES2332981T3 (en) |
FR (1) | FR2803453B1 (en) |
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US5179512A (en) * | 1991-09-18 | 1993-01-12 | General Electric Company | Gate drive for synchronous rectifiers in resonant converters |
EP0660976B1 (en) * | 1993-07-14 | 1997-08-06 | Melcher Ag | Synchronous rectifier resistant to feedback |
DE59402749D1 (en) * | 1994-01-31 | 1997-06-19 | Siemens Ag | Circuit arrangement with a field effect transistor |
JP2806320B2 (en) * | 1995-09-13 | 1998-09-30 | 日本電気株式会社 | Synchronous rectification circuit |
US6026005A (en) * | 1997-06-11 | 2000-02-15 | International Rectifier Corp. | Single ended forward converter with synchronous rectification and delay circuit in phase-locked loop |
-
2000
- 2000-01-03 FR FR0000007A patent/FR2803453B1/en not_active Expired - Fee Related
- 2000-11-09 AT AT00403115T patent/ATE441963T1/en not_active IP Right Cessation
- 2000-11-09 DE DE60042876T patent/DE60042876D1/en not_active Expired - Lifetime
- 2000-11-09 ES ES00403115T patent/ES2332981T3/en not_active Expired - Lifetime
- 2000-11-09 EP EP00403115A patent/EP1115195B1/en not_active Expired - Lifetime
- 2000-11-20 CA CA002326641A patent/CA2326641C/en not_active Expired - Fee Related
- 2000-11-30 US US09/725,847 patent/US6292380B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1276217A3 (en) * | 2001-06-25 | 2004-09-29 | Alcatel | Self-controlled synchronous rectifier |
US20060133116A1 (en) * | 2004-12-17 | 2006-06-22 | Schaible Todd M | Synchronous rectifier gate drive shutdown circuit |
US7362598B2 (en) | 2004-12-17 | 2008-04-22 | Artesyn Technologies, Inc. | Synchronous rectifier gate drive shutdown circuit |
Also Published As
Publication number | Publication date |
---|---|
EP1115195B1 (en) | 2009-09-02 |
CA2326641C (en) | 2009-04-07 |
FR2803453B1 (en) | 2002-03-29 |
FR2803453A1 (en) | 2001-07-06 |
US6292380B2 (en) | 2001-09-18 |
DE60042876D1 (en) | 2009-10-15 |
ATE441963T1 (en) | 2009-09-15 |
CA2326641A1 (en) | 2001-07-03 |
ES2332981T3 (en) | 2010-02-16 |
EP1115195A1 (en) | 2001-07-11 |
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