WO2016192281A1 - 同步整流管驱动方法、同步整流管电路和开关电源 - Google Patents
同步整流管驱动方法、同步整流管电路和开关电源 Download PDFInfo
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- WO2016192281A1 WO2016192281A1 PCT/CN2015/092851 CN2015092851W WO2016192281A1 WO 2016192281 A1 WO2016192281 A1 WO 2016192281A1 CN 2015092851 W CN2015092851 W CN 2015092851W WO 2016192281 A1 WO2016192281 A1 WO 2016192281A1
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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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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
- H02M7/2195—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration the switches being synchronously commutated at the same frequency of the AC input voltage
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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
- Embodiments of the present invention relate to, but are not limited to, the field of switching power supplies, and more particularly to a synchronous rectifier driving method, a synchronous rectifier circuit, and a switching power supply.
- the synchronous rectification control method commonly used in the related art generally comprises: detecting an output current in a secondary winding of the transformer unit according to the simultaneous conduction of the upper and lower switching tubes in the same bridge arm of the synchronous rectification circuit, and according to the method
- the output current generates a first driving signal, and the first driving signal drives the on/off of the rectifier in the synchronous rectification circuit.
- the current sampling device is used to detect the output current in the secondary winding of the transformer unit, that is, the current flowing through the parasitic body diode of the synchronous rectifier, and the synchronous rectifier is turned on when a current is detected to pass.
- the current detecting circuit has a parasitic parameter, which is easy to delay the signal of the output current, and is easy to cause the delay of the turn-on and turn-off signals.
- the first driving signal converted from the signal of the output current also has a delay phenomenon and is susceptible to There is interference signal due to the influence of the power circuit. When the amplitude of these interference signals exceeds the base drive voltage threshold of the synchronous rectifier, it will cause the false rectifier to be turned on, which will cause the synchronous rectifier to pass through and cause the synchronous rectifier to be damaged. .
- the embodiment of the invention provides a synchronous rectifier driving method, a synchronous rectifier circuit and a switch
- the power supply can accurately control the turn-on and turn-off of the synchronous rectifier.
- Embodiments of the present invention provide a synchronous rectifier driving method for driving a rectifier in a synchronous rectifier circuit, and the synchronous rectifier driving method includes: detecting an output current in a secondary winding of the transformer unit, and Deriving an output current to generate a first driving signal, the method comprising:
- a rectifier in the synchronous rectification circuit is driven according to the second drive signal.
- the obtaining the protection signal according to the voltage signal of the secondary winding of the transformer unit comprises:
- a first voltage and a second voltage across the secondary winding of the transformer unit are detected, and the protection signal is obtained according to a comparison result of the first voltage and the second voltage.
- the protection signal comprises a first voltage signal inputA and a second voltage signal inputB
- the obtaining the protection signal according to the comparison result of the first voltage and the second voltage includes: when the first voltage VA is greater than the second voltage VB, the first voltage signal inputA is a high level signal, and the second voltage signal is The input B is a low level signal; when the first voltage VA is smaller than the second voltage VB, the first voltage signal inputA is a low level signal, and the second voltage signal inputB is a high level signal.
- the correcting the first driving signal by using the obtained protection signal to obtain the second driving signal comprises:
- the AND operation is performed on the first drive signal and the protection signal, and the result of the AND operation is used as the second drive signal.
- the embodiment of the invention further provides a synchronous rectifier circuit, the synchronous rectifier circuit comprising: a transformer unit, a current sampling unit, a first signal processing unit, a driving unit, and a synchronous rectifier unit, wherein the current sampling unit is configured To detect an output current in a secondary winding of the transformer unit; the first signal processing unit is configured to generate a first drive signal based on an output current in a secondary winding of the transformer unit; the synchronous rectifier circuit further comprising : protection unit and second signal Processing unit
- the protection unit is configured to obtain a protection signal according to a voltage signal of a secondary winding of the transformer unit in the synchronous rectifier circuit;
- the second signal processing unit is configured to correct the first driving signal by using the obtained protection signal to obtain a second driving signal
- the driving unit is configured to drive a rectifier tube in the synchronous rectification circuit according to the second driving signal.
- the transformer unit comprises one or more transformers; each transformer comprises one or more secondary windings, and the current sampling unit comprises a first transformer and a rectifier circuit;
- the primary side of the first transformer is connected in series to the first secondary winding, wherein the first secondary winding is one of the secondary windings corresponding to any one of the transformers; the secondary side of the first transformer is connected to the rectifier circuit; The rectifier circuit generates a first voltage signal VR left and a second voltage signal VR right according to the current signal output by the first transformer.
- the first signal processing unit includes a first comparison circuit, where the first driving signal includes a third voltage signal V left and a fourth voltage signal V right ;
- the first comparison circuit is provided with a reference voltage V ref1 , and the first comparison circuit obtains the third voltage signal V left by comparing the first voltage signal VR left and the reference voltage V ref1 , and passes the second voltage signal VR right and the reference voltage The comparison of V ref1 results in the fourth voltage signal V right .
- the third voltage signal V left and the fourth voltage signal V right are square wave signals
- the protection unit includes a voltage detection circuit and a second comparison circuit: the protection signal includes a fifth voltage signal inputA and a sixth voltage signal inputB;
- the input ends of the voltage detecting circuit are respectively connected to two ends of the second secondary winding, and the detected seventh voltage signal V A and the eighth voltage signal V B are supplied to the second comparison circuit, wherein Said second secondary winding is one of the secondary windings corresponding to any one of the transformers;
- the second comparison circuit compares the seventh voltage signal V A and the eighth voltage signal V B according to the detected seventh voltage signal V A and the eighth voltage signal V B to obtain a fifth voltage signal inputA and a sixth Voltage signal inputB.
- the protection signal comprises a fifth voltage signal inputA and a sixth voltage signal inputB
- the second comparison circuit is configured to: when the seventh voltage signal V A is greater than the eighth voltage signal V B , the output fifth voltage signal inputA is a high level signal, and the output sixth voltage signal inputB is a low level When the seventh voltage signal V A is smaller than the eighth voltage signal V B , the output fifth voltage signal inputA is a low level signal, and the output sixth voltage signal inputB is a high level signal.
- the second signal processing unit is configured to:
- the second driving signal includes a first driving signal outputA and a second driving signal outputB;
- the third voltage signal V left and the fifth voltage signal inputA are subjected to an AND operation to obtain a first driving signal outputA; and the fourth voltage signal V right and the sixth voltage signal inputB are subjected to an AND operation to obtain a second driving signal outputB.
- the embodiment of the invention further provides a switching power supply, which comprises any of the above synchronous rectifier circuits.
- the technical solution provided by the embodiment of the present invention includes: obtaining a protection signal according to a voltage signal of a secondary winding of a transformer unit in a synchronous rectifier circuit, wherein the protection signal is reversed according to a level in a primary winding of the transformer unit. Forwarding synchronous inversion; correcting the first driving signal by using the obtained protection signal to obtain a second driving signal; and driving the rectifier in the synchronous rectifying circuit according to the second driving signal.
- the turn-on and turn-off of the synchronous rectifier are controlled only by the first driving signal, and in the embodiment of the invention, since the protection signal can synchronously reversely reverse according to the level inversion in the primary winding of the transformer unit,
- the second driving signal obtained by correcting the first driving signal by the protection signal eliminates the high level of the first driving signal in the delay region, thereby eliminating the delay phenomenon of level inversion in the first driving signal, thereby It avoids the false opening of the synchronous rectifier, thereby reducing the damage of the synchronous rectifier, improving the performance of the synchronous rectifier circuit, and improving the performance of the switching power supply including the synchronous rectifier circuit.
- FIG. 1 is a schematic flow chart of a synchronous rectifier driving method according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram of a synchronous rectifier circuit according to Embodiment 2 of the present invention.
- 3A, 3B, 3C, 3D, 3E, and 3F are circuit structural diagrams of a synchronous rectifier circuit provided by an application embodiment of the present invention.
- FIG. 4A is a circuit structural diagram of a rectifier circuit according to an application embodiment of the present invention.
- 4B is a circuit structural diagram of a first comparison circuit according to an application embodiment of the present invention.
- 4C is a circuit diagram of a voltage detecting circuit according to an application embodiment of the present invention.
- 4D is a circuit structural diagram of a second comparison circuit according to an application embodiment of the present invention.
- 4E is a circuit structural diagram of an interlock circuit according to an application embodiment of the present invention.
- FIG. 5 is a schematic diagram of comparison of a plurality of signals in the synchronous rectifier circuit.
- an embodiment of the present invention provides a synchronous rectifier driving method for driving a rectifier in a synchronous rectifier circuit
- the synchronous rectifier circuit includes a transformer unit
- the synchronous rectifier driving method includes: detecting An output current in a secondary winding of the transformer unit, and generating a first drive signal based on the output current, the method comprising:
- Step 100 obtaining a protection signal according to a voltage signal of a secondary winding of the transformer unit
- the protection signal is synchronously inverted according to a level inversion in the primary winding of the transformer unit
- obtaining the protection signal comprises:
- a first voltage and a second voltage across the secondary winding of the transformer unit are detected, and the protection signal is obtained according to a comparison result of the first voltage and the second voltage.
- the obtaining the protection signal according to the comparison result of the first voltage and the second voltage includes: the protection signal includes a voltage signal inputA and a voltage signal inputB.
- the voltage signal inputA is High level signal
- voltage signal inputB is low level Signal
- the voltage signal inputA is a low level signal
- the voltage signal inputB is a high level signal.
- Step 200 Obtain the second driving signal according to the first driving signal and the protection signal (correcting the first driving signal by using the obtained protection signal);
- the AND operation is performed on the first drive signal and the protection signal, and the result of the AND operation is used as the second drive signal.
- Step 300 Drive a rectifier tube in the synchronous rectification circuit according to the second driving signal.
- FIG. 2 is a block diagram of a synchronous rectifier circuit according to an embodiment of the present invention.
- the synchronous rectifier circuit provided includes: a transformer unit 10, a current sampling unit 20, a first signal processing unit 30, a protection unit 40, a second signal processing unit 50, a driving unit 60, and a synchronous rectifier unit 70;
- a current sampling unit 20 configured to detect an output current in a secondary winding of the transformer unit 10
- the first signal processing unit 30 is configured to generate a first driving signal according to an output current in the secondary winding of the transformer unit 10;
- the protection unit 40 is configured to obtain a protection signal according to a voltage signal of the secondary winding of the transformer unit 10 in the synchronous rectifier circuit;
- the second signal processing unit 50 is configured to correct the first driving signal by using the obtained protection signal to obtain a second driving signal;
- the driving unit 60 is configured to drive the rectifier in the synchronous rectification circuit according to the second driving signal.
- the protection signal is synchronously inverted according to the level inversion in the primary winding of the transformer unit 10.
- the synchronous rectifier in the synchronous rectifier unit 70 is connected to the secondary winding of the transformer unit 10.
- the transformer unit 10 includes one or more transformers; each of the transformers includes one or more secondary windings, and the current sampling unit 20 includes a first transformer and a rectifier circuit;
- the primary side of the first transformer is connected in series to the first secondary winding, wherein the first secondary winding is one of the secondary windings corresponding to any one of the transformers; the secondary side of the first transformer is connected to the rectifier circuit; The rectifier circuit generates voltage signals VR left and VR right according to the current signal output by the first transformer.
- the first signal processing unit 30 includes a first comparison circuit, and the first driving signal includes voltage signals V left and V right ;
- the first comparison circuit is provided with a reference voltage V ref1 , and the first comparison circuit obtains the voltage signal V left by comparing the voltage signal VR left and the reference voltage V ref1 , and obtains a voltage signal by comparing the voltage signal VR right with the reference voltage V ref1 .
- V ref1 a reference voltage
- the protection unit 40 includes a voltage detection circuit and a second comparison circuit: the protection signal includes voltage signals inputA and inputB;
- the input ends of the voltage detecting circuit are respectively connected to two ends of the second secondary winding, and the detected voltage signals V A and V B are supplied to the second comparison circuit, wherein the second secondary winding One of the secondary windings corresponding to any one of the transformers;
- the second comparison circuit compares the voltage signals V A and V B according to the detected voltage signals V A and V B to obtain voltage signals inputA and inputB.
- the second comparison circuit is configured to: when the voltage signal V A (the first voltage VA in the above method) is greater than the voltage signal V B (the second voltage VB in the above method), the output voltage signal inputA is a high level signal, and the output voltage signal inputB is a low level signal; when the voltage signal V A is smaller than the voltage signal V B , the output voltage signal inputA is a low level signal, and the output voltage signal inputB is a high level. signal.
- the second signal processing unit is configured to:
- the second driving signal includes a driving signal outputA and a driving signal outputB;
- the voltage signal V left and the voltage signal inputA are subjected to an AND operation to obtain a driving signal outputA; and the voltage signal V right and the voltage signal inputB are subjected to an AND operation to obtain a driving signal outputB.
- the present embodiment proposes a synchronous rectifier circuit.
- the transformer unit 10 includes a transformer T1; the transformer T1 includes a secondary winding, and the synchronous rectifier unit 70 includes four rectifier tubes, which are respectively rectifier tubes SR1, SR2. SR3 and SR4, where SR1 and SR3 are on the same bridge arm and SR2 and SR4 are on the same bridge arm.
- the current sampling unit 20 includes a first transformer (current transformer T2 in this example) and a rectifier circuit; the primary side of the current transformer T2 is connected in series to the secondary winding of the transformer T1, and the secondary side of the current transformer T2 is connected.
- the current transformer T2 is connected in series with the secondary winding of the transformer T1 and is connected to the source of the full-bridge synchronous rectifier SR1.
- the current detected by the primary side of the current transformer T2 is an alternating current signal, and the secondary side of the current transformer T2 is rectified.
- the circuits are connected.
- the rectifier circuit generates voltage signals VR left and VR right according to the current signal output by the first transformer T2.
- the first comparison circuit (in the present example, the comparison circuit 1) is provided with a reference voltage V ref1 , and the first comparison circuit obtains the voltage signal V left by comparing the voltage signal VR left and the reference voltage V ref1 , and passes the voltage signal VR right and the reference. A comparison of the voltage V ref1 results in a voltage signal V right .
- the voltage signals V left and V right are square wave signals.
- the protection unit 40 includes a voltage detection circuit and a second comparison circuit (comparison circuit 2 in this example): the protection signals are voltage signals inputA and inputB.
- the input ends of the voltage detecting circuit are respectively connected to two ends of the second secondary winding, wherein the voltage detecting circuit respectively detects the voltage of the source A point of the synchronous rectifier SR1 and the drain B point of the synchronous rectifier SR4 to the ground.
- the voltage signals V A and V B are obtained , and the voltage detecting circuit supplies the detected voltage signals V A and V B to the comparison circuit 2, and the second comparison circuit performs the pair according to the detected voltage signals V A and V B .
- the voltage signals V A and V B are compared to obtain voltage signals inputA and inputB (protection signals).
- the protection signal includes a voltage signal inputA and inputB, when the voltage signal V A is greater than the voltage signal V B , the inputA is a high level signal, inputB It is a low level signal; when the voltage signal V A is smaller than the voltage signal V B , inputA is a low level signal, and inputB is a high level signal.
- the second signal processing unit 50 (an interlock circuit in this example) is arranged to obtain the second drive signal (outputA and outputB signals) based on the first drive signal and the protection signal.
- V left and V right are logically ANDed with the protection signals inputA and inputB through the interlock circuit to generate outputA and outputB signals.
- a drive unit 60 (in this example, a drive circuit) is provided to drive all of the rectifiers in the synchronous rectifier unit 70 in accordance with the second drive signal.
- the V left signal is transformed and finally corresponds to the driving voltage signal V g (SR1, SR4) between the base and the source of the synchronous rectifiers SR1 and SR4, that is, the outputA signal is transformed to obtain V g (SR1, SR4), V g (SR1, SR4) are used to drive the synchronous rectifiers SR1 and SR4; the V right signal is transformed and finally driven between the base and source of the synchronous rectifiers SR2, SR3.
- the voltage signals V g (SR2, SR3) correspond, that is, the outputB signals are transformed to obtain V g (SR2, SR3), and V g (SR2, SR3) is used to drive the synchronous rectifiers SR2 and SR3.
- the present embodiment proposes a synchronous rectifier circuit.
- the transformer unit 10 includes a transformer T1; each of the transformers includes two secondary windings, IS12 and IS13, and the two windings IS12 and IS13 are in parallel relationship.
- the secondary windings are respectively connected to a full bridge synchronous rectification circuit.
- the synchronous rectifier unit 70 includes eight synchronous rectifiers, which are rectifiers SR1, SR2, SR3, SR4, SR5, SR6, SR7 and SR8, wherein SR1 and SR3 are on the same bridge arm, and SR2 and SR4 are on the same bridge arm. SR5 and SR6 are on the same bridge arm, and SR7 and SR8 are on the same bridge arm.
- the current sampling unit 20 includes a first transformer (current transformer T2 in this example) and a rectifier circuit; the primary side of the current transformer T2 is connected in series to the secondary winding IS12 of the transformer T1, and the secondary side of the current transformer T2 Connect to the rectifier circuit.
- the current transformer T2 is connected in series with the secondary winding IS12 of the transformer T1 and is connected to the source of the full-bridge synchronous rectifier SR1, and the secondary side of the current transformer T2 is connected to the rectifier circuit.
- the rectifier circuit generates voltage signals VR left and VR right based on the current signal output from the first transformer T2.
- the first comparison circuit (in the present example, the comparison circuit 1) is provided with a reference voltage V ref1 , and the first comparison circuit obtains the voltage signal V left by comparing the voltage signal VR left and the reference voltage V ref1 , and passes the voltage signal VR right and the reference. A comparison of the voltage V ref1 results in a voltage signal V right .
- the voltage signals V left and V right are square wave signals.
- the protection unit 40 includes a voltage detection circuit and a second comparison circuit (comparison circuit 2 in this example): the protection signal is a voltage signal inputA and a voltage signal inputB.
- the input ends of the voltage detecting circuit are respectively connected to two ends of the secondary winding IS13, wherein the voltage detecting circuit respectively detects the voltage of the source A point of the synchronous rectifier SR5 and the drain B point of the synchronous rectifier SR8 to the ground, The voltage signals V A and V B are obtained , and the voltage detecting circuit supplies the detected voltage signals V A and V B to the comparison circuit 2, and the second comparison circuit performs voltage according to the detected voltage signals V A and V B The signal V A and V B are compared to obtain a protection signal (voltage signal inputA and voltage signal inputB).
- the V left signal corresponds to the driving voltage signal V g (SR1, SR4, SR5, SR8) between the base and the source of the synchronous rectifiers SR1, SR4, SR5, SR8 through the circuit conversion;
- the right signal is subjected to circuit conversion and finally corresponds to the driving voltage signals V g (SR2, SR3, SR6, SR7) between the base and source of the synchronous rectifiers SR2, SR3, SR6, SR7.
- the current transformer and the secondary winding IS12 are connected in series, and the voltage detecting circuit and the secondary winding IS13 are connected in parallel.
- the current transformer and the voltage detecting circuit can also be implemented in the same full-bridge synchronous rectifier circuit. That is, both the current transformer and the voltage detecting circuit are connected to the same secondary winding IS12, or both the current transformer and the voltage detecting circuit are connected to the same secondary winding IS13.
- the present embodiment proposes a synchronous rectifier circuit.
- the transformer unit 10 includes transformers T1 and T2, and the primary windings of the transformers T1 and T2 are in a series relationship; each transformer includes a secondary winding, and the secondary of the transformer T1 The winding is the secondary winding IS12, and the secondary winding corresponding to the transformer T2 is the secondary winding IS13, and each secondary winding is divided into Do not connect a full bridge synchronous rectifier circuit.
- the synchronous rectifier unit 70 includes eight synchronous rectifiers, which are rectifiers SR1, SR2, SR3, SR4, SR5, SR6, SR7 and SR8, wherein SR1 and SR3 are on the same bridge arm, and SR2 and SR4 are on the same bridge arm.
- the synchronous rectifier unit 70 composed of SR1, SR2, SR3, and SR4 is connected to the secondary winding IS12, SR5 and SR6 are on the same bridge arm, SR7 and SR8 are on the same bridge arm, and SR5, SR6, SR7 and SR8 are composed.
- the synchronous rectifier unit 70 is connected to the secondary winding IS13.
- the current sampling unit 20 includes a first transformer (current transformer T2 in this example) and a rectifier circuit; the primary side of the current transformer T2 is connected in series to the secondary winding IS12 of the transformer T1, and the secondary side of the current transformer T2 Connect to the rectifier circuit.
- the current transformer T2 is connected in series with the secondary winding IS12 of the transformer T1 and is connected to the source of the full-bridge synchronous rectifier SR1, and the secondary side of the current transformer T2 is connected to the rectifier circuit.
- the rectifier circuit generates voltage signals VR left and VR right according to the current signal output by the first transformer T2.
- the first comparison circuit (in the present example, the comparison circuit 1) is provided with a reference voltage V ref1 , and the first comparison circuit obtains the voltage signal V left by comparing the voltage signal VR left and the reference voltage V ref1 , and passes the voltage signal VR right and the reference. A comparison of the voltage V ref1 results in a voltage signal V right .
- the voltage signals V left and V right are square wave signals.
- the protection unit 40 includes a voltage detection circuit and a second comparison circuit (comparison circuit 2 in this example): the protection signals are voltage signals inputA and inputB.
- the input ends of the voltage detecting circuit are respectively connected to two ends of the secondary winding IS13, wherein the voltage detecting circuit respectively detects the voltage of the source A point of the synchronous rectifier SR5 and the drain B point of the synchronous rectifier SR8 to the ground, The voltage signals V A and V B are obtained , and the voltage detecting circuit supplies the detected voltage signals V A and V B to the comparison circuit 2, and the second comparison circuit performs voltage according to the detected voltage signals V A and V B The signals V A and V B are compared to obtain voltage signals inputA and inputB (protection signals).
- the V left signal corresponds to the driving voltage signal V g (SR1, SR4, SR5, SR8) between the base and the source of the synchronous rectifiers SR1, SR4, SR5, SR8 through the circuit conversion;
- the right signal is subjected to circuit conversion and finally corresponds to the driving voltage signals V g (SR2, SR3, SR6, SR7) between the base and source of the synchronous rectifiers SR2, SR3, SR6, SR7.
- the current transformer and the secondary winding IS12 are connected in series, and the voltage detecting circuit and the secondary winding IS13 are connected in parallel.
- the current transformer and the voltage detecting circuit can also be implemented in the same full-bridge synchronous rectifier circuit. That is, both the current transformer and the voltage detecting circuit are connected to the same secondary winding IS12, or both the current transformer and the voltage detecting circuit are connected to the same secondary winding IS13.
- the present embodiment proposes a synchronous rectifier circuit.
- the difference between the synchronous rectifier circuit provided in this embodiment and the synchronous rectifier circuit shown in FIG. 3A is that the synchronization provided in this embodiment is a full-wave double-voltage synchronous rectifier circuit.
- the transformer unit 10 includes a transformer T1; the transformer T1 includes a secondary winding, and the synchronous rectifier unit 70 includes two synchronous rectifiers SR1 and SR2 and two capacitors C1 and C2.
- the current sampling unit 20 includes a first transformer (current transformer T2 in this example) and a rectifier circuit; the primary side of the current transformer T2 is connected in series to the secondary winding of the transformer T1, and the secondary side of the current transformer T2 is connected.
- the current transformer T2 is connected in series with the secondary winding of the transformer T1 and is connected to the source of the full-bridge synchronous rectifier SR1.
- the current detected by the primary side of the current transformer T2 is an alternating current signal, and the secondary side of the current transformer T2 is rectified.
- the circuits are connected.
- the rectifier circuit generates voltage signals VR left and VR right according to the current signal output by the first transformer T2.
- the protection unit 40 includes a voltage detection circuit and a second comparison circuit (comparison circuit 2 in this example): the protection signal is a voltage signal inputA and a voltage signal inputB.
- the input ends of the voltage detecting circuit are respectively connected to two ends of the second secondary winding, wherein the voltage detecting circuit respectively detects the voltage of the source A of the synchronous rectifier SR1 to the ground and the voltage across the capacitor C2 to obtain a voltage signal.
- V A and V B the voltage detecting circuit supplies the detected voltage signals V A and V B to the comparison circuit 2, and the second comparison circuit performs the voltage signal V A based on the detected voltage signals V A and V B Compared with V B , a voltage signal inputA and a voltage signal inputB (protection signal) are obtained.
- a drive unit 60 (in this example, a drive circuit) is provided to drive all of the rectifiers in the synchronous rectifier unit 70 in accordance with the second drive signal.
- the V left signal is transformed and finally corresponds to the driving voltage signal V g (SR1) between the base and the source of the synchronous rectifier SR1, that is, the outputA signal is transformed to obtain V g (SR1), V g (SR1) is used to drive the synchronous rectifier SR1;
- the V right signal is transformed to finally correspond to the driving voltage signal V g (SR2, SR3) between the base and source of the synchronous rectifiers SR2, SR3. That is, the outputB signal is transformed to obtain V g (SR2), and V g (SR2) is used to drive the synchronous rectifier SR2.
- the present embodiment proposes a synchronous rectifier circuit.
- the synchronous rectifier circuit provided in this embodiment is different from the synchronous rectifier circuit shown in FIG. 3D in that the synchronous rectifier circuit provided in this embodiment has two upper windings connected to the secondary transformer T1, and the two windings are In parallel relationship, each secondary winding is connected to a full-wave double-voltage synchronous rectifier circuit.
- the current sampling device current transformer T2 is connected to the first full-wave voltage doubler synchronous rectifier circuit, and the voltage detecting circuit detects the voltage across the secondary winding in the second full-wave voltage doubler synchronous rectifier circuit.
- the V left signal is subjected to circuit conversion and finally corresponds to the driving voltage signal V g (SR1, SR3) between the base and the source of the synchronous rectifiers SR1, SR3; the V right signal is finally converted and synchronously rectified by circuit conversion.
- the driving voltage signals V g (SR2, SR4) between the base and the source of the tubes SR2, SR4 correspond to each other.
- This embodiment can also be implemented by using a current transformer and a voltage detecting circuit in the same full-wave voltage doubler synchronous rectifier circuit.
- the secondary of the main transformer T1 can also be connected to more than two secondary windings.
- the windings are connected in parallel, and each secondary winding is connected to a full-wave double-voltage synchronous rectifier circuit, current sampling and The voltage detection can be in the same full-wave double-voltage synchronous rectifier circuit, or they can be located separately.
- Two-way full-wave voltage doubler synchronous rectification circuit can be used to detect full-wave voltage doubler synchronous rectification circuit.
- the present embodiment proposes a synchronous rectifier circuit.
- the synchronous rectifier circuit provided in this embodiment is different from the synchronous rectifier circuit shown in FIG. 3D in that the synchronous rectifier circuit provided in this embodiment has two main transformers, namely a main transformer T1 and a main transformer T3, two The secondary of the main transformer is connected to a full-wave double-voltage synchronous rectifier circuit, and the primary windings of the two main transformers are connected in series.
- the current sampling device current transformer T2 is connected to the first full-wave voltage doubler synchronous rectification circuit, and the voltage detection circuit detects the second winding of the second full-voltage double-voltage synchronous rectifier circuit to the ground. Voltage.
- the V left signal is subjected to circuit conversion and finally corresponds to the driving voltage signal V g (SR1, SR3) between the base and the source of the synchronous rectifiers SR1, SR3; the V right signal is finally converted and synchronously rectified by circuit conversion.
- the driving voltage signals V g (SR2, SR4) between the base and the source of the tubes SR2, SR4 correspond to each other.
- This embodiment can also be implemented by using a current transformer and a voltage detecting circuit in the same full-bridge rectifier circuit.
- the current sampling device in the current sampling unit 20 uses a current transformer, and the current signal of the secondary winding may be detected in other manners, for example, a resistor is connected in series in the secondary winding. The detection of the current signal of the secondary winding can be achieved.
- the number of transformers in the transformer unit 10 may also be two or more.
- the primary windings of the main transformers are connected in series, and the secondary windings of each main transformer are respectively connected to a full wave double voltage synchronization.
- the rectifying circuit, the current sampling unit 20 and the voltage detecting circuit may be disposed in the same full-bridge synchronous rectification circuit, or may be respectively disposed in different two-way full-bridge synchronous rectification circuits.
- FIG. 4A a circuit structure diagram of a rectifier circuit according to the embodiment is shown.
- the secondary IS11 terminal of the current transformer T2 is simultaneously connected to the anode of the rectifier diode D1 and the cathode of the rectifier diode D4, and the current mutual inductance is obtained.
- the secondary IS12 terminal of the device T2 is simultaneously connected to the cathode of the rectifier diode D2 and the anode of the rectifier diode D3, and the detection resistor R1 is connected between the cathode of the diode D1 and the anode of the diode D2, and the cathode of the diode D3 is connected to the anode of the diode D4.
- the resistor R2 is detected, the anodes of the diodes D2 and D4 are simultaneously connected to the ground signal, the VR right signal is generated between the cathode of the diode D1 and the ground, and the VR left signal is generated between the cathode of the diode D3 and the ground.
- FIG. 4B a circuit structure diagram of a first comparison circuit according to the embodiment is shown.
- the VR left signal is connected to the input "+” terminal of the comparator 1, and the VR right signal and the input of the comparator 2 are connected.
- the "+” terminal is connected, and the V ref1 signal is simultaneously connected to the "-" terminals of the comparator 1 and the comparator 2, the output signal of the comparator 1 is the V left signal, and the output signal of the comparator 2 is the V right signal.
- FIG. 4C the circuit structure diagram of a voltage detecting circuit according to the embodiment is shown in FIG. 4C.
- the detecting resistors R3 and R4 are connected in series and connected between the point A and the ground signal, and the detecting resistors R5 and R6 are connected in series. Between point B and ground, the junction of sense resistors R3 and R4 produces a V A signal, and the junction of sense resistors R5 and R6 produces a V B signal.
- FIG. 4D a circuit structure diagram of a second comparison circuit according to the present embodiment is shown.
- the V A signal is simultaneously input to the input "-" terminal of the comparator 1 and the input "+” terminal of the comparator 2.
- the V B signal is simultaneously connected to the input "+” terminal of the comparator 1 and the input "-” terminal of the comparator 2, wherein the output signal of the comparator 1 is inputB, and the output signal of the comparator 2 is inputA.
- FIG. 4E a circuit structure diagram of an interlock circuit according to the present embodiment is shown in FIG. 4E.
- the interlock circuit includes two AND gates, and the signal inputA and the signal V right are respectively connected to the two inputs of the AND gate 1.
- the signal inputB and the signal V left are respectively connected to the two input terminals of the AND gate 2, the output signal of the AND gate 1 is outputA, and the output signal of the AND gate 2 is outputB.
- the sinusoidal current period of the secondary current of the main transformer T1 is taken as an example to analyze the working process of the circuit.
- FIG. 5 a comparison diagram of a plurality of signals in the synchronous rectifier circuit is described.
- the V left signal is low when the output voltage VR left of the rectifier circuit is lower than the reference voltage V ref1 .
- the level signal, the synchronous rectifiers SR1 and SR4 have no driving voltage, and the current I flows through the internal parasitic diodes of SR1 and SR4.
- the V left signal is a high level signal.
- the high level model is driven by the driving circuit to drive the synchronous rectifiers SR1 and SR4 to be turned on.
- the output voltage VR left of the rectifier circuit is lower than the reference.
- the V ref1 the V left signal is a low level signal synchronous rectifiers SR1 and SR4 are turned off.
- the driving circuit drives the synchronous rectifier tubes SR2 and SR3 to be turned on, when the current signal I right gradually decreases to zero, when the output voltage VR right of the rectifier circuit is lower than the reference voltage V ref1 , the V right signal is a low level signal synchronous rectification Tubes SR2 and SR3 are turned off.
- the output signals V left and V right of the comparator 1 and the comparator 2 also have a hysteresis delay, as shown in FIG. 5 by V left. And the right arrow of the V right signal is shown. If the delay signal in V left and V right is not processed, the synchronous rectifiers SR1 and SR3 or SR2 and SR4 on the same bridge arm are simultaneously turned on to cause a straight-through phenomenon, and the straight-through will cause damage to the synchronous rectifier.
- the embodiment of the invention uses the voltage detecting circuit to detect the voltages V A and V B of the ground point A and B in the figure.
- the voltage of the ground point A is V A is higher than point B to ground voltage V B
- comparator output of input 3 is low level
- output 4 of comparator 4 is high level
- the output of comparator 3 changes from input low to high level
- output 4 of comparator 4 changes from high level to low level due to transformer secondary current
- the waveform is shown in Figure 5.
- the interlock circuit "puts" inputA and inputB with V left and V right respectively. Since inputA and inputB are accurate without delay, even if V left and V right are delayed, V left and V right are simultaneously When the time is high, as shown by the shaded area in Figure 5, after input and output are respectively performed by inputA and inputB with V left and V right , the output signals outputA and outputB will not be high in the related technology.
- the embodiment of the present invention further provides a switching power supply, which includes any of the synchronous rectifier circuits provided in the above embodiments.
- the protection signal can synchronously reverse synchronously according to the level inversion in the primary winding of the transformer unit
- the second driving signal obtained by correcting the first driving signal by the protection signal eliminates the first A driving signal is at a high level in the delay region, thereby eliminating the delay phenomenon of level inversion in the first driving signal, thereby avoiding the erroneous opening of the synchronous rectifier, thereby reducing the damage of the synchronous rectifier.
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Abstract
Description
Claims (11)
- 一种同步整流管驱动方法,用于驱动同步整流管电路中的整流管,所述同步整流管驱动方法包括:检测变压器单元的次级绕组中的输出电流,并根据所述输出电流,生成第一驱动信号,其特征在于,所述方法包括:根据同步整流管电路中变压器单元的次级绕组的电压信号,得到保护信号;利用得到的保护信号对所述第一驱动信号进行修正得到第二驱动信号;根据所述第二驱动信号驱动同步整流电路中的整流管。
- 根据权利要求1所述的同步整流管驱动方法,其中,所述根据变压器单元的次级绕组的电压信号,得到保护信号包括:检测变压器单元的次级绕组两端的第一电压和第二电压,根据所述第一电压和第二电压的比较结果,得到所述保护信号。
- 根据权利要求2所述的同步整流管驱动方法,其中,保护信号包括第一电压信号inputA和第二电压信号inputB,所述根据所述第一电压和第二电压的比较结果,得到所述保护信号包括:当第一电压VA大于第二电压VB时,第一电压信号inputA为高电平信号,第二电压信号inputB为低电平信号;当第一电压VA小于第二电压VB时,第一电压信号inputA为低电平信号,第二电压信号inputB为高电平信号。
- 根据权利要求2所述的同步整流管驱动方法,其中,所述利用得到的保护信号对所述第一驱动信号进行修正得到第二驱动信号包括:对第一驱动信号和保护信号执行与运算,将与运算的结果作为第二驱动信号。
- 一种同步整流管电路,所述同步整流管电路包括:变压器单元、电流采样单元、第一信号处理单元、驱动单元、以及同步整流管单元,所述电流采样单元设置为检测所述变压器单元的次级绕组中的输出电流;所述第一信号处理单元设置为根据变压器单元的次级绕组中的输出电流,生成第一驱动信号;其特征在于,所述同步整流管电路还包括:保护单元和第二信号处理 单元;所述保护单元设置为根据同步整流管电路中变压器单元的次级绕组的电压信号,得到保护信号;所述第二信号处理单元设置为利用得到的保护信号对所述第一驱动信号进行修正得到第二驱动信号;所述驱动单元设置为根据所述第二驱动信号驱动同步整流电路中的整流管。
- 根据权利要求5所述的同步整流管电路,其中,所述变压器单元包括一个或多个变压器;每个变压器均包括一个或多个次级绕组,所述电流采样单元包括第一互感器和整流电路;第一互感器的初级侧串联至第一次级绕组,其中,所述第一次级绕组为任意一个变压器对应的次级绕组中的一个;第一互感器的次级侧连接至整流电路;整流电路根据第一互感器输出的电流信号生成第一电压信号VRleft和第二电压信号VRright。
- 根据权利要求6所述的同步整流管电路,其中,所述第一信号处理单元包括第一比较电路,所述第一驱动信号包括第三电压信号Vleft和第四电压信号Vright;第一比较电路中设置有基准电压Vref1,第一比较电路通过比较第一电压信号VRleft和基准电压Vref1,得到所述第三电压信号Vleft,通过第二电压信号VRright和基准电压Vref1的比较,得到所述第四电压信号Vright,其中,第三电压信号Vleft和第四电压信号Vright均为方波信号。
- 根据权利要求6所述的同步整流管电路,其中,所述保护单元包括电压检测电路和第二比较电路:所述保护信号包括第五电压信号inputA和第六电压信号inputB;所述电压检测电路的输入端分别连接至第二次级绕组的两端,并将检测得到的第七电压信号VA和第八电压信号VB提供给所述第二比较电路,其中,所述第二次级绕组为任意一个变压器对应的次级绕组中的一个;所述第二比较电路根据检测得到的第七电压信号VA和第八电压信号VB, 对第七电压信号VA和第八电压信号VB进行比较,得到第五电压信号inputA和第六电压信号inputB。
- 根据权利要求8所述的同步整流管电路,其中,保护信号包括第五电压信号inputA和第六电压信号inputB,所述第二比较电路是设置为:当第七电压信号VA大于第八电压信号VB时,输出的第五电压信号inputA为高电平信号,输出的第六电压信号inputB为低电平信号;当第七电压信号VA小于第八电压信号VB时,输出的第五电压信号inputA为低电平信号,输出的第六电压信号inputB为高电平信号。
- 根据权利要求8所述的同步整流管电路,其中,所述第二信号处理单元是设置为:对第一驱动信号和保护信号执行与运算,将与运算的结果作为第二驱动信号;第二驱动信号包括第一驱动信号outputA和第二驱动信号outputB;其中,对第三电压信号Vleft和第五电压信号inputA执行与运算,得到第一驱动信号outputA;对第四电压信号Vright和第六电压信号inputB执行与运算,得到第二驱动信号outputB。
- 一种开关电源,所述开关电源包括如权利要求5~10中任一项所述的同步整流管电路。
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