CN113472203A - Synchronous rectification protection method and circuit for DC/DC converter of electric vehicle - Google Patents
Synchronous rectification protection method and circuit for DC/DC converter of electric vehicle Download PDFInfo
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- CN113472203A CN113472203A CN202010244030.2A CN202010244030A CN113472203A CN 113472203 A CN113472203 A CN 113472203A CN 202010244030 A CN202010244030 A CN 202010244030A CN 113472203 A CN113472203 A CN 113472203A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 22
- 230000000694 effects Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000002265 prevention Effects 0.000 description 1
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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
-
- 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
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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
- H02M1/38—Means for preventing simultaneous conduction of switches
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a synchronous rectification protection method and circuit for a DC/DC converter of an electric vehicle, wherein the method comprises the following steps: when a primary side turn-off demand signal of the DC/DC converter is received, a secondary side turn-off signal is sent out and a secondary side of the DC/DC converter is turned off; judging whether a primary side turn-off demand signal and a secondary side turn-off signal exist simultaneously or not; if yes, sending a primary side turn-off signal and turning off the primary side of the DC/DC converter. By adopting the method, when the converter stops working, the secondary side is closed before the primary side, the current backflow is avoided, and the effect of protecting the synchronous rectification circuit of the DC/DC converter is achieved.
Description
Technical Field
The present disclosure relates to DC/DC converter protection methods, and more particularly, to a synchronous rectification protection method and circuit for a DC/DC converter of an electric vehicle.
Background
The total power consumption of the low-voltage load of the electric automobile is generally more than hundred amperes, so that the output current of the DC/DC converter is also larger, and the voltage drop of a common rectifier diode is much larger than that of an MOSFET (metal-oxide-semiconductor field effect transistor), so that the secondary side rectification of the DC/DC converter generally adopts a synchronous rectifier circuit to reduce the loss, improve the working efficiency of the DC/DC converter, reduce the heat emission of a device and facilitate the design of a heat dissipation structure. Because the load of the secondary side synchronous rectification is provided with the storage battery, when the synchronous rectification is performed backward, the MOSFET has bidirectional conductivity and can generate negative current, when the MOSFET is switched off in the negative current, peak voltage breakdown failure of a drain source electrode is easily generated due to instant no-path release of energy in a loop, further direct short circuit failure is generated, and the like, so that the backward flowing prevention is important for avoiding the failure of the synchronous rectifier.
In the prior art, an ORING circuit is usually adopted on a DC/DC output side to detect the voltage difference on a bus to judge the current direction, and when the current reversal is identified, the MOSET added on the bus is turned off to cut off a loop so as to prevent backward flow; the method needs to add the MOSFET and the surrounding driving circuit on the output bus, and the cost is relatively high; and increase MOSFET power devices and drive control, leading to increased risk of failure points.
Disclosure of Invention
In order to solve the technical problem, the present disclosure provides a synchronous rectification protection method and circuit for a DC/DC converter of an electric vehicle, wherein when the converter stops working, a secondary side is closed before a primary side, so as to avoid current backflow, and play a role in protecting the synchronous rectification circuit of the DC/DC converter.
The technical scheme of the disclosure is realized as follows:
a synchronous rectification protection method for a DC/DC converter of an electric vehicle comprises the following steps:
when a primary side turn-off demand signal of the DC/DC converter is received, a secondary side turn-off signal is sent out and a secondary side of the DC/DC converter is turned off;
judging whether a primary side turn-off demand signal and a secondary side turn-off signal exist simultaneously or not; if yes, sending a primary side turn-off signal and turning off the primary side of the DC/DC converter.
Further, the primary side off demand signal comprises a plurality of demand signals; the primary side turn-off demand signal received by the DC/DC converter is as follows: any one or more of a plurality of demand signals are received.
Further, the primary side off demand signal includes: a primary side shutdown demand signal and a hardware fault demand signal for shutting down the primary side of the DC/DC converter.
A circuit applied to the synchronous rectification protection method of the DC/DC converter of the electric automobile comprises the following steps:
the input end of the secondary side turn-off module is connected with the primary side turn-off demand signal switch; when the primary side turn-off demand signal switch is switched on, the secondary side turn-off module outputs a secondary side turn-off signal;
the output end of the secondary side turn-off signal module is connected with the input end of the primary side turn-off module; the input end of the primary side turn-off module is connected with the primary side turn-off demand signal switch; when the primary side turn-off module receives the secondary side turn-off signal and requires the primary side turn-off signal to be turned on, the primary side turn-off module sends a primary side turn-off signal.
Furthermore, the primary side turn-off demand signal switch comprises a plurality of demand signal switches, and each demand signal switch is respectively connected with the input end of the secondary side turn-off module and the input end of the primary side turn-off module; and if any one or more demand signal switches are switched on, judging that the primary side switching-off demand signal switch is switched on.
Further, the primary side turn-off demand signal switch includes: a primary side switch-off signal switch and a hardware fault signal switch for switching off the primary side of the DC/DC converter.
Further, the secondary side turn-off module comprises a first or gate circuit, and each demand signal switch is connected with the input end of the first or gate circuit;
the primary side turn-off module comprises a second OR gate circuit and a plurality of AND gate circuits, and each demand signal switch is connected with one input end of one AND gate circuit; the output end of the first OR gate circuit is connected with the other input ends of all the AND gate circuits;
and the output ends of all the AND circuits are respectively connected with the input end of the second OR gate circuit, and the output end of the second OR gate circuit is the primary side turn-off signal output end of the primary side turn-off module.
Further, the first OR gate circuit is an OR logic chip, and/or
The second or gate circuit and the plurality of and gate circuits are integrated into one and or not integrated logic chip.
Further, the secondary side shutdown module includes: the negative electrodes of the diodes are mutually connected in parallel; and each demand signal switch is respectively connected with the anode of a diode, the cathode of the diode is connected with the triode, and the triode is controlled to output a switch signal as a secondary side turn-off signal.
Further, the transistor includes: an NPN type triode Q1 and an NPN type triode Q2, wherein the cathodes of all the diodes are connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q1 is connected with a power supply through a resistor R2, and the emitter electrode of the triode Q1 and the emitter electrode of the triode Q2 are both grounded; the collector of the transistor Q2 is connected with the power supply through a resistor R3, and the collector of the transistor Q2 is the output end of the secondary side turn-off module.
Compared with the prior art, the synchronous rectification protection method for the DC/DC converter of the electric automobile has the following advantages that:
when a primary side turn-off demand signal of the DC/DC converter is received, the primary side of the DC/DC converter is not directly turned off, but a secondary side turn-off signal is sent out firstly and a secondary side of the DC/DC converter is turned off; the primary side is turned off after the secondary side is turned off, the primary side of the DC/DC converter is turned off, and the risk of current backflow is prevented by setting the turn-off sequence.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic flow chart of a synchronous rectification protection method for a DC/DC converter of an electric vehicle according to a first embodiment of the present invention;
FIG. 2 is a circuit logic diagram of the present invention;
FIG. 3 is a logic schematic of the primary side turn-off circuit of the present invention;
fig. 4 is a schematic circuit diagram according to a second embodiment of the present invention.
A first or gate circuit 1, a second or gate circuit 2, and an and gate circuit 3.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
The embodiment provides a synchronous rectification protection method for a DC/DC converter of an electric vehicle, and with reference to FIG. 1, the protection method comprises the following steps:
when receiving a primary side turn-off demand signal of the DC/DC converter, the DSP sends a secondary side turn-off signal X3 and turns off the secondary side of the DC/DC converter;
judging whether a primary side turn-off demand signal and a secondary side turn-off signal X3 exist simultaneously; and if so, sending a primary side turn-off signal L and turning off the primary side of the DC/DC converter.
According to a desired setting, the primary side turn-off demand signal comprises a plurality of demand signals; the primary side turn-off demand signal received by the DC/DC converter is as follows: any one or more of a plurality of demand signals are received.
In this embodiment, the primary side off demand signal includes: a primary side shutdown demand signal X1 and a hardware fault demand signal X2 on the primary side of the DC/DC converter.
By the method, the overall logic is as follows: the secondary side is turned off before the primary side, so that the backward flow risk is avoided; in this embodiment, if the signal X1 or the signal X2 is generated, the secondary side shutdown signal X3 is performed first, and then the primary side is shut down when the signal X1 and the signal X3 are simultaneously present, or the signal X2 and the signal X3 are simultaneously present.
Example two:
the embodiment relates to a circuit applied to the synchronous rectification protection method of the electric vehicle DC/DC converter according to the method of the first embodiment, and the method includes:
the input end of the secondary side turn-off module is connected with the primary side turn-off demand signal switch; when the primary side turn-off demand signal switch is switched on, the secondary side turn-off module outputs a secondary side turn-off signal;
the output end of the secondary side turn-off signal module is connected with the input end of the primary side turn-off module; the input end of the primary side turn-off module is connected with the primary side turn-off demand signal switch; when the primary side turn-off module receives the secondary side turn-off signal and requires the primary side turn-off signal to be turned on, the primary side turn-off module sends a primary side turn-off signal.
According to the expected setting, the primary side turn-off demand signal switch comprises a plurality of demand signal switches, and each demand signal switch is respectively connected with the input end of the secondary side turn-off module and the input end of the primary side turn-off module; and if any one or more demand signal switches are switched on, judging that the primary side switching-off demand signal switch is switched on.
In this embodiment, the primary side turn-off demand signal switch includes: a primary side switch-off signal switch and a hardware fault signal switch for switching off the primary side of the DC/DC converter.
According to the above logic, the logic circuit of the secondary side turn-off module is designed, as shown in fig. 2, the secondary side turn-off module includes a first or gate circuit 1, each demand signal switch is connected to an input end of the first or gate circuit 1, and when any one or more demand signal switches are turned on, an output end of the first or gate circuit 1 outputs a signal, that is, the secondary side turn-off module outputs a secondary side turn-off signal X3.
According to the logic, a logic circuit of the primary side turn-off module is designed, as shown in fig. 2 and fig. 3, the primary side turn-off module comprises a second or gate circuit 2 and a plurality of and gate circuits 3, and each demand signal switch is connected with one input end of one and gate circuit 3; the output end of the first or gate circuit 1 is connected with the other input ends of all the and gate circuits 3; the output ends of all the and circuits 3 are respectively connected with the input end of the second or gate circuit 2, and the output end of the second or gate circuit 2 is the primary side turn-off signal output end of the primary side turn-off module.
In the circuit, one end of each of the and circuits 3 is connected with a demand signal switch, and the other ends are connected in parallel, when any one or more demand signal switches are switched on and the first or gate circuit 1 is switched on, the and circuit corresponding to the switched-on demand signal switch is switched on, so that the second or gate circuit 2 is switched on, and a primary side turn-off signal is output.
Based on the above circuit logic, in this embodiment, the first or gate circuit 1 may directly adopt an or logic chip, the second or gate circuit 2 may also directly adopt an or logic chip, and the and gate circuit 3 may directly adopt an and logic chip.
The conditions that the load capacity is poor and the standard value is shifted at low level are considered in series connection with the AND gate; in order to increase the load capacity, the second or gate circuit 2 and the plurality of and gate circuits 3 are integrated into one and or not integrated logic chip.
Referring to fig. 4, in consideration of the problems of poor load capacity and low level offset standard value of the series-connected or gate, the present embodiment adopts a circuit design scheme in which a diode is connected in parallel to replace an or logic chip, and specifically, the secondary side turn-off module includes: the negative electrodes of the diodes are mutually connected in parallel; and each demand signal switch is respectively connected with the anode of a diode, the cathode of the diode is connected with the triode, and the output signal of the triode is controlled to be used as a secondary side turn-off signal.
The number of the diodes is determined by the desired set primary side turn-off demand signal, and in this embodiment, the triode is an NPN type triode. The triode includes: a triode Q1 and a triode Q2, wherein the cathodes of all the diodes are connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q1 is connected with a power supply through a resistor R2, and the emitter electrode of the triode Q1 and the emitter electrode of the triode Q2 are both grounded; the collector of the transistor Q2 is connected with the power supply through a resistor R3, and the collector of the transistor Q2 is the output end of the secondary side turn-off module.
According to the circuit logic of this embodiment, taking the number of the primary side turn-off demand signals in the first embodiment as an example, a specific circuit is designed, that is, the primary side turn-off demand signals include: a primary side shutdown demand signal and a hardware fault demand signal for shutting down the primary side of the DC/DC converter. As shown in fig. 4, the diode includes a diode D1 and a diode D2, and the and or nor logic chip T1 is an SN5451 integrated chip. The logic of the SN5451 chip is shown in fig. 3.
The positive electrode of the diode D1 is connected with a primary side turn-off demand signal switch corresponding to a demand primary side turn-off signal X1, and the positive electrode of the diode D2 is connected with a primary side turn-off demand signal switch corresponding to a hardware fault signal X2 of the primary side of the demand turn-off DC/DC converter; the cathodes of the diodes D1 and D2 are connected in parallel with each other and are grounded through a resistor R1; meanwhile, the cathode of the diode D1 is connected with the input end 2A of the chip T1, and the cathode of the diode D2 is connected with the input end 2C of the chip T1;
meanwhile, the cathodes of the diodes D1 and D2 are connected to the base of the transistor Q1, a voltage-stabilizing capacitor C1 is connected in parallel between the collector and the emitter of the transistor Q1, and the collector of the transistor Q2 is connected to the input terminals 2B and 2D of the chip T1.
In the primary side turn-off signal output module, the output end 2Y of the T1 is connected to the base of an NPN-type triode Q3 through a resistor R4, the emitter of the triode Q3 is grounded, the collector is connected to the power supply through a resistor R5, and the collector of the triode Q3 is the output end of the primary side turn-off signal L.
The secondary side turn-off signal X3 is connected to a turn-off enabling pin of a secondary side MOS driving chip, so that the secondary side of the DC/DC converter is turned off according to a secondary side turn-off signal X3; in this embodiment, the collector of the transistor Q2 is connected to the off enable pin of the secondary MOS driver chip.
The primary side turn-off signal L is connected to a turn-off enabling pin of the primary side MOS driving chip, so that the primary side of the DC/DC converter is turned off according to the primary side turn-off signal L; in this embodiment, the collector of the transistor Q3 is connected to the off enable pin of the primary side MOS driver chip.
Based on the circuit of the embodiment, when only the primary side turn-off demand signal exists, the circuit does not trigger the primary side turn-off signal, but first triggers the primary side turn-off signal unless the secondary side turn-off signal exists, and when the primary side turn-off demand signal and the secondary side turn-off signal exist simultaneously, the primary side of the DC/DC converter is turned off, so that the synchronous rectification circuit of the DC/DC converter is protected.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (10)
1. A synchronous rectification protection method for a DC/DC converter of an electric vehicle is characterized by comprising the following steps:
when a primary side turn-off demand signal of the DC/DC converter is received, a secondary side turn-off signal is sent out and a secondary side of the DC/DC converter is turned off;
judging whether a primary side turn-off demand signal and a secondary side turn-off signal exist simultaneously or not; if yes, sending a primary side turn-off signal and turning off the primary side of the DC/DC converter.
2. The synchronous rectification protection method for the DC/DC converter of the electric automobile according to claim 1, wherein the primary side turn-off demand signal comprises a plurality of demand signals; the primary side turn-off demand signal received by the DC/DC converter is as follows: any one or more of a plurality of demand signals are received.
3. The synchronous rectification protection method of the DC/DC converter of the electric automobile according to claim 2, wherein the primary side turn-off demand signal comprises: a primary side shutdown demand signal and a hardware fault demand signal for shutting down the primary side of the DC/DC converter.
4. A circuit applied to the synchronous rectification protection method of the electric vehicle DC/DC converter according to any one of claims 1 to 3, characterized by comprising:
the input end of the secondary side turn-off module is connected with the primary side turn-off demand signal switch; when the primary side turn-off demand signal switch is switched on, the secondary side turn-off module outputs a secondary side turn-off signal;
the output end of the secondary side turn-off signal module is connected with the input end of the primary side turn-off module; the input end of the primary side turn-off module is connected with the primary side turn-off demand signal switch; when the primary side turn-off module receives the secondary side turn-off signal and requires the primary side turn-off signal to be turned on, the primary side turn-off module sends a primary side turn-off signal.
5. The circuit of claim 4, wherein the primary-side turn-off demand signal switch comprises a plurality of demand signal switches, each demand signal switch being connected to an input of the secondary-side turn-off module and an input of the primary-side turn-off module, respectively; and if any one or more demand signal switches are switched on, judging that the primary side switching-off demand signal switch is switched on.
6. The circuit of claim 5, wherein the primary side off demand signal switch comprises: a primary side switch-off signal switch and a hardware fault signal switch for switching off the primary side of the DC/DC converter.
7. The circuit of claim 5, wherein the secondary side turn-off block comprises a first OR gate circuit, each demand signal switch being connected to an input of the first OR gate circuit, respectively;
the primary side turn-off module comprises a second OR gate circuit and a plurality of AND gate circuits, and each demand signal switch is connected with one input end of one AND gate circuit; the output end of the first OR gate circuit is connected with the other input ends of all the AND gate circuits;
and the output ends of all the AND circuits are respectively connected with the input end of the second OR gate circuit, and the output end of the second OR gate circuit is the primary side turn-off signal output end of the primary side turn-off module.
8. The circuit of claim 7, wherein the first or gate circuit is an or logic chip, and/or
The second or gate circuit and the plurality of and gate circuits are integrated into one and or not integrated logic chip.
9. The circuit of any of claims 5-7, wherein the secondary side turn-off module comprises: the negative electrodes of the diodes are mutually connected in parallel; and each demand signal switch is respectively connected with the anode of a diode, the cathode of the diode is connected with the triode, and the triode is controlled to output a switch signal as a secondary side turn-off signal.
10. The circuit of claim 9, wherein the transistor comprises: an NPN type triode Q1 and an NPN type triode Q2, wherein the cathodes of all the diodes are connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q1 is connected with a power supply through a resistor R2, and the emitter electrode of the triode Q1 and the emitter electrode of the triode Q2 are both grounded; the collector of the transistor Q2 is connected with the power supply through a resistor R3, and the collector of the transistor Q2 is the output end of the secondary side turn-off module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010244030.2A CN113472203B (en) | 2020-03-31 | 2020-03-31 | Synchronous rectification protection method and circuit for DC/DC converter of electric vehicle |
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| CN202010244030.2A CN113472203B (en) | 2020-03-31 | 2020-03-31 | Synchronous rectification protection method and circuit for DC/DC converter of electric vehicle |
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| CN113472203B CN113472203B (en) | 2023-01-06 |
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| US20070008757A1 (en) * | 2003-09-02 | 2007-01-11 | Hiroshi Usui | Synchronous commutation dc-dc converter |
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| CN103780094A (en) * | 2012-10-19 | 2014-05-07 | 光宝科技股份有限公司 | Power supply conversion device |
| CN104319986A (en) * | 2011-12-21 | 2015-01-28 | 华为技术有限公司 | Power supply powering off method and power supply |
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2020
- 2020-03-31 CN CN202010244030.2A patent/CN113472203B/en active Active
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|---|---|---|---|---|
| US20070008757A1 (en) * | 2003-09-02 | 2007-01-11 | Hiroshi Usui | Synchronous commutation dc-dc converter |
| CN1571255A (en) * | 2004-04-30 | 2005-01-26 | 艾默生网络能源有限公司 | Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter |
| CN101141095A (en) * | 2006-09-06 | 2008-03-12 | 台达电子工业股份有限公司 | Synchronous commutation consequent converter with reverse current suppresser |
| CN104319986A (en) * | 2011-12-21 | 2015-01-28 | 华为技术有限公司 | Power supply powering off method and power supply |
| CN103780094A (en) * | 2012-10-19 | 2014-05-07 | 光宝科技股份有限公司 | Power supply conversion device |
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