CN112202339A - Output reverse connection protection circuit of electric automobile direct current converter - Google Patents
Output reverse connection protection circuit of electric automobile direct current converter Download PDFInfo
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- CN112202339A CN112202339A CN202011054197.9A CN202011054197A CN112202339A CN 112202339 A CN112202339 A CN 112202339A CN 202011054197 A CN202011054197 A CN 202011054197A CN 112202339 A CN112202339 A CN 112202339A
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- circuit
- switch tube
- switching tube
- buck
- storage battery
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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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
- H02M1/32—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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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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- 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
Abstract
The invention provides an output reverse connection protection circuit of a direct current converter of an electric automobile, which relates to the technical field of charging of the electric automobile and comprises a primary conversion group topology circuit, a synchronous rectification circuit, a BUCK follow current circuit, a BUCK circuit and a storage battery, so that circuit failure caused by wrong reverse connection of the storage battery is effectively reduced, and cost payment caused by replacement of a direct current converter assembly or an integrated component is reduced. Meanwhile, the reverse connection protection circuit is designed at the follow current circuit part, the high-current power circuit is not connected in series, the required MOSFET current specification is only half of the current specification of the MOSFET connected in series to the power circuit, the design cost of the reverse connection protection circuit is effectively reduced, the high-current power circuit is not connected, the system loss is reduced, and the system efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electric vehicle charging, in particular to an output reverse connection protection circuit of an electric vehicle direct-current converter.
Background
Electric automobiles are rapidly developed in recent years, intelligent driving technology, automatic driving technology and the like are applied at an accelerated speed, low-voltage controllers of automobile-making electric automobiles are continuously increased, and low-voltage load current is obviously increased. Meanwhile, the integration level of the vehicle-mounted charging equipment is higher and higher, the vehicle-mounted charger of the electric automobile and the vehicle-mounted low-voltage direct-current converter of the electric automobile are perfectly integrated, the cost of the vehicle-mounted charging equipment is greatly reduced, and meanwhile, higher requirements are provided for the reliability of the vehicle-mounted charging equipment. The traditional anti-reverse connection circuit design is mainly realized by adopting a relay control or MOS series connection circuit.
For example, patent document CN 206992759U discloses an anti-reverse-connection circuit for output of a vehicle-mounted battery charger, which is connected to a power circuit in series by using MOS, so that when the battery of the circuit is short-circuited or reverse-connected, a base voltage Vb of a triode is converted from a positive potential to a negative potential, an emitter voltage Ve is converted from a zero potential to a positive potential, the triode is immediately in a cut-off state due to reverse bias of an emitter node Vbe, thereby preventing circuit elements from being damaged due to timing delay caused by detection of a single chip microcomputer, so that a switch tube and a switch tube switch are cut off in the cut-off state in advance before the single chip microcomputer is not converted, and the charger has no voltage output, can play a role in better protecting a battery pack and the charger, and does not generate a battery ignition. However, as the load output current is larger, the MOS loss is also larger, the number of MOS transistors is larger, the cost is higher, and the output efficiency of the system is affected.
Still like patent document for CN 103825266A discloses a circuit is prevented reversing connection by vehicle-mounted machine back level output, including preceding stage output, back level output, relay, diode circuit and preceding stage sampling and control circuit, the relay is normally open relay, diode circuit includes diode and the current-limiting resistance that establishes ties mutually, and diode circuit connects in parallel at the normally open contact both ends of relay, and the preceding stage output connects the back level output through the normally open contact of relay, preceding stage sampling and control circuit establish ties between the coil of preceding stage output and relay. The invention adopts the mode that the relay is connected in series with the power circuit through the pure hardware circuit design, so that the circuit structure is simple and reliable, the cost is low, the performance is stable, the output of the rear-stage battery end can be effectively prevented from reversely flowing to the charger in time, the vehicle-mounted charger and the storage battery are effectively protected, the service life of the battery is prolonged, and the safety and the reliability of the whole vehicle system are greatly improved. However, when the current is large, the selection of the relay becomes extremely difficult and the cost is extremely high, and the volume is relatively large, which affects the miniaturization design of the product. The loss of relay design is very big, and relay switch number of times has restricted on-vehicle battery charging outfit's life-span simultaneously.
Therefore, it is necessary to invent an output reverse connection protection circuit of an electric vehicle dc converter.
Disclosure of Invention
In view of the above, the invention aims to provide an output reverse connection protection circuit of an electric vehicle direct current converter, which is used for solving the technical problems that the traditional reverse connection protection circuit mostly adopts a relay control or MOS series connection circuit mode, so that the relay loss is extremely large, and the service life of vehicle-mounted charging equipment is shortened.
The invention provides an output reverse connection protection circuit of a direct current converter of an electric automobile, which comprises:
the primary conversion set topology circuit is connected with the input end of the isolation transformer and is any one of an LLC circuit, a full-bridge circuit and a phase-shifted full-bridge circuit; the first end of the synchronous rectification circuit is connected with the first port of the output end of the isolation transformer, the second end of the synchronous rectification circuit is connected with the second port of the output end of the isolation transformer, and the third end of the synchronous rectification circuit is connected with the negative electrode of the storage battery; one end of the BUCK circuit is connected with a sliding port at the output end of the isolation transformer, and the other end of the BUCK circuit is connected with the anode of the storage battery through a first coil; and one end of the BUCK follow current circuit is connected with the anode of the storage battery through the first coil, and the other end of the BUCK follow current circuit is connected with the cathode of the storage battery.
Further, the synchronous rectification circuit comprises a fifth switching tube Q5 and a sixth switching tube Q6, wherein the gate of the fifth switching tube Q5 is connected with an external driving chip, the drain of the fifth switching tube Q5 is connected with the first port of the output end of the isolation transformer, the source of the fifth switching tube Q5 is connected with the cathode of the storage battery, and the fifth switching tube Q5 is an N-channel MOSFET; the grid electrode of the sixth switching tube Q6 is connected with an external driving chip, the drain electrode of the sixth switching tube Q6 is connected with the second port of the output end of the isolation transformer, the source electrode of the sixth switching tube Q6 is connected with the cathode of the storage battery, and the sixth switching tube Q6 is an N-channel MOSFET.
Further, the BUCK circuit comprises a seventh switch tube Q7, a drain of the seventh switch tube Q7 is connected with a sliding port of the output end of the isolation transformer, a gate of the seventh switch tube Q7 is connected with an external driving chip, a source of the seventh switch tube is connected with the anode of the battery through the first coil, and the seventh switch tube Q7 is an N-channel MOSFET.
Further, the BUCK freewheeling circuit includes an eighth switching tube Q8 and a ninth switching tube Q9, the eighth switching tube Q8 and the ninth switching tube Q9 are both N-channel MOSFETs, the eighth switching tube Q8 and the ninth switching tube Q9 are connected in series, a first resistor R1 for current limiting is connected in parallel between a source electrode and a gate electrode of the eighth switching tube Q8, a drain electrode of the eighth switching tube is connected with the positive electrode of the battery through a first coil, a second resistor R2 for current limiting is connected in parallel between the source electrode and the gate electrode of the ninth switching tube Q9, and a drain electrode of the ninth switching tube is connected with the negative electrode of the battery.
Further, the resistance values of the first resistor and the second resistor are set between 5.1k omega and 10k omega.
The invention brings the following beneficial effects:
the output reverse connection protection circuit of the direct current converter of the electric automobile comprises a primary conversion group topology circuit, a synchronous rectification circuit, a BUCK follow current circuit, a BUCK circuit and a storage battery, and effectively reduces circuit failure caused by wrong reverse connection of the storage battery, so that cost payment caused by replacement of a direct current converter assembly or an integrated component is reduced. On the other hand, the reverse connection protection circuit is designed on the follow current circuit part and is not connected with the large-current power circuit in series, the required MOSFET current specification is only half of the current specification of the MOSFET connected with the power circuit in series, the design cost of the reverse connection protection circuit is effectively reduced, and the large-current power circuit is not connected, so that the system loss is reduced, and the system efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of an output reverse connection protection circuit of a direct current converter of an electric vehicle according to the present invention;
FIG. 2 is a schematic diagram of a topology of an output reverse-connection protection circuit of an electric vehicle DC converter according to the present invention;
fig. 3 is a topological structure diagram without adding a ninth switching tube.
In the figure:
1-a primary conversion group topology circuit, 2-a synchronous rectification circuit, 3-BUCK follow current circuit, 4-BUCK circuit and 5-a storage battery;
l1-first coil, L2-second coil, C-capacitance;
q1-first switch tube, Q2-second switch tube, Q3-third switch tube, Q4-fourth switch tube, Q5-fifth switch tube, Q6-sixth switch tube, Q7-seventh switch tube, Q8-eighth switch tube and Q9-ninth switch tube.
Detailed Description
As shown in fig. 1 or fig. 2, the reverse connection protection circuit for the output of the direct current converter of the electric vehicle comprises 5 parts, such as a primary conversion group topology circuit 1, a synchronous rectification circuit 2, a BUCK follow current circuit 3, a BUCK circuit 4, a storage battery 5 and the like. The primary conversion set topology circuit 1 is connected with an input end of the isolation transformer, the primary conversion set topology circuit 1 is any one of an LLC circuit, a full bridge circuit and a phase-shifted full bridge circuit, and in this embodiment, the primary conversion set topology circuit is described by taking the LLC circuit as an example. The first end of the synchronous rectification circuit 2 is connected with the first port of the output end of the isolation transformer, the second end of the synchronous rectification circuit 2 is connected with the second port of the output end of the isolation transformer, and the third end of the synchronous rectification circuit 2 is connected with the negative electrode of the storage battery 5. The synchronous rectification circuit 2 comprises a fifth switching tube Q5 and a sixth switching tube Q6, wherein the grid electrode of the fifth switching tube Q5 is connected with an external driving chip, the drain electrode of the fifth switching tube Q5 is connected with the first port of the output end of the isolation transformer, and the source electrode of the fifth switching tube Q5 is connected with the negative electrode of the storage battery 5. The grid electrode of the sixth switching tube Q6 is connected with an external driving chip, the drain electrode of the sixth switching tube Q6 is connected with the second port of the output end of the isolation transformer, the source electrode of the sixth switching tube Q6 is connected with the cathode of the storage battery 5, and the fifth switching tube Q5 and the sixth switching tube Q6 are N-channel MOSFETs. The one end of BUCK circuit 4 is connected with the first port of isolation transformer output, the other end of BUCK circuit 4 pass through first coil L1 with the anodal of battery 5 is connected, BUCK circuit 4 includes seventh switch tube Q7, the drain electrode of seventh switch tube Q7 is connected with the sliding port of isolation transformer output, and the grid and the external driver chip of seventh switch tube Q7 are connected, and the source electrode of seventh switch tube passes through first coil L1 with the anodal of battery 5 is connected, and seventh switch tube Q7 is N channel MOSFET. One end of the BUCK follow current circuit 3 is connected with the anode of the storage battery 5 through the first coil L1, and the other end of the BUCK follow current circuit is connected with the cathode of the storage battery 5. The BUCK freewheeling circuit 3 includes an eighth switch Q8 and a ninth switch Q9, and the eighth switch Q8 and the ninth switch Q9 are N-channel MOSFETs. The eighth switching tube Q8 is connected in series with the ninth switching tube Q9, a first resistor R1 for current limiting is connected in parallel between the source and the gate of the eighth switching tube Q8 to prevent the eighth switching tube from burning out due to floating conduction, and the drain of the eighth switching tube is connected with the positive electrode of the battery 5 through a first coil L1. A second resistor R2 for limiting current is also connected in parallel between the source and the gate of the ninth switching tube Q9 to prevent the second resistor from burning out due to hanging conduction, and the drain of the ninth switching tube is connected with the negative electrode of the battery 5. Wherein the resistance of the first resistor R1 and the second resistor R2 is generally set between 5.1k Ω -10k Ω.
As shown in fig. 2, the primary converter topology circuit is an example of an LLC circuit, and the LLC circuit is provided with a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, and a fourth switching tube Q4, wherein a drain of the first switching tube Q1 is connected to a power supply HV +, a source of the first switching tube Q1 is connected to a drain of the third switching tube, a source of the third switching tube Q3 is grounded or connected to the power supply HV +, a drain of the second switching tube Q2 is connected to the power supply HV +, a source of the second switching tube Q2 is connected to a drain of the fourth switching tube Q4, and a source of the fourth switching tube Q4 is grounded or connected to the power supply HV-. In order to play a role in current-limiting rectification, a capacitor C and a second coil L2 are further arranged in the LLC circuit, one end of the second coil L2 is connected to the power supply HV +, the other end of the second coil L2 is connected to the first input end of the isolation transformer, one end of the capacitor C is connected between the first switch tube Q1 and the third switch tube Q3, the other end of the capacitor C is connected to the second input end of the isolation transformer, and the gates of all the switch tubes in the LLC circuit are connected to an external driver chip.
In an actual working environment, when LV + is correctly connected to the positive terminal of the storage battery 5 and LV-is correctly connected to the negative terminal of the storage battery 5, the circuit is correctly connected. When the circuit is started normally, the ninth switching tube Q9 in the BUCK freewheeling circuit 3 is controlled by the system to be conducted, and the BUCK freewheeling circuit 3 works normally. Specifically, the outputs LV + and LV-must not be intentionally reversed during normal operation of the circuit.
As shown in fig. 2 or fig. 3, when LV + is inadvertently connected to the negative terminal of the battery 5 by mistake, and LV-is connected to the positive terminal of the battery 5 by mistake, the circuit is connected by mistake, and at this time, the conventional BUCK freewheeling circuit 3 without reverse connection protection only has the eighth switching tube Q8 or the freewheeling diode, and the eighth switching tube Q8 or the freewheeling diode is conducted in the forward direction due to the reverse connection of the BUCK freewheeling circuit 3, so that the BUCK freewheeling circuit 3 is conducted through to form a large-current loop, and finally, the eighth switching tube Q8 or the freewheeling diode in the BUCK freewheeling circuit 3 is burned out. By adding the ninth switching tube Q9 in the BUCK freewheeling circuit 3, when LV + is connected to the negative pole end of the storage battery 5 in error again, LV-is connected to the positive pole end of the storage battery 5 in error, and when the circuit is connected in error, the circuit has no low-voltage power supply to be connected and cannot start to work, the ninth switching tube Q9 is not driven to be in a turn-off state, and the BUCK freewheeling circuit cannot be burnt and fail due to reverse connection of the storage battery. On the other hand, the fifth switching tube Q5, the sixth switching tube Q6 and the seventh switching tube Q7 in the BUCK circuit 4 in the synchronous rectification circuit 2 are all N-channel switching tubes, and when the circuit is in an inoperative state, the characteristics of the switching tubes are cut off in the reverse direction, so that a large-current loop cannot be formed to cause device burnout, and the reverse connection protection effect is effectively achieved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Claims (5)
1. An electric automobile direct current converter output reverse connection protection circuit is characterized by comprising:
the transformer isolation transformer comprises a primary conversion set topology circuit (1), wherein the primary conversion set topology circuit (1) is connected with an input end of an isolation transformer, and the primary conversion set topology circuit (1) is any one of an LLC circuit, a full-bridge circuit and a phase-shifted full-bridge circuit;
the first end of the synchronous rectification circuit is connected with the first port of the output end of the isolation transformer, the second end of the synchronous rectification circuit is connected with the second port of the output end of the isolation transformer, and the third end of the synchronous rectification circuit is connected with the negative electrode of the storage battery (5);
the device comprises a BUCK circuit (4), one end of the BUCK circuit is connected with a sliding port of the output end of an isolation transformer, and the other end of the BUCK circuit is connected with the positive electrode of the storage battery (5) through a first coil L1;
and one end of the BUCK follow current circuit (3) is connected with the positive electrode of the storage battery (5) through the first coil (L1), and the other end of the BUCK follow current circuit is connected with the negative electrode of the storage battery (5).
2. The reverse output protection circuit of the DC converter of an electric vehicle according to claim 1, wherein the synchronous rectification circuit (2) comprises a fifth switch tube Q5 and a sixth switch tube Q6, wherein,
the grid electrode of the fifth switching tube Q5 is connected with an external driving chip, the drain electrode of the fifth switching tube Q5 is connected with the first port of the output end of the isolation transformer, the source electrode of the fifth switching tube Q5 is connected with the cathode of the storage battery (5), and the fifth switching tube Q5 is an N-channel MOSFET;
the grid electrode of the sixth switching tube Q6 is connected with an external driving chip, the drain electrode of the sixth switching tube Q6 is connected with the second port of the output end of the isolation transformer, the source electrode of the sixth switching tube Q6 is connected with the cathode of the storage battery (5), and the sixth switching tube Q6 is an N-channel MOSFET.
3. The output reverse connection protection circuit of the electric vehicle direct current converter according to claim 1, characterized in that the BUCK circuit (4) comprises a seventh switch tube Q7, the drain of the seventh switch tube Q7 is connected with the sliding port of the output end of the isolation transformer, the gate of the seventh switch tube Q7 is connected with an external driving chip, the source of the seventh switch tube is connected with the positive electrode of the storage battery (5) through the first coil L1, and the seventh switch tube Q7 is an N-channel MOSFET.
4. The output reverse connection protection circuit of the electric vehicle direct current converter according to claim 1, wherein the BUCK freewheeling circuit (3) includes an eighth switch tube Q8 and a ninth switch tube Q9, the eighth switch tube Q8 and the ninth switch tube Q9 are both N-channel MOSFETs, the eighth switch tube Q8 and the ninth switch tube Q9 are connected in series, a first resistor R1 for current limiting is connected in parallel between a source and a gate of the eighth switch tube Q8, a drain of the eighth switch tube is connected to a positive electrode of the battery (5) through a first coil L1, a second resistor R2 for current limiting is connected in parallel between a source and a gate of the ninth switch tube Q9, and a drain of the ninth switch tube is connected to a negative electrode of the battery (5).
5. The reverse output protection circuit of the DC converter of the electric vehicle as claimed in claim 4, wherein the resistances of the first resistor R1 and the second resistor R2 are set between 5.1k Ω -10k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011054197.9A CN112202339A (en) | 2020-09-30 | 2020-09-30 | Output reverse connection protection circuit of electric automobile direct current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011054197.9A CN112202339A (en) | 2020-09-30 | 2020-09-30 | Output reverse connection protection circuit of electric automobile direct current converter |
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| Publication Number | Publication Date |
|---|---|
| CN112202339A true CN112202339A (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011054197.9A Pending CN112202339A (en) | 2020-09-30 | 2020-09-30 | Output reverse connection protection circuit of electric automobile direct current converter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004135478A (en) * | 2002-10-15 | 2004-04-30 | Fuji Electric Fa Components & Systems Co Ltd | Step-down, step-up compatible dc-dc converter |
| CN202535116U (en) * | 2012-04-27 | 2012-11-14 | 广东易事特电源股份有限公司 | Solar energy charging circuit |
| CN208638083U (en) * | 2018-08-01 | 2019-03-22 | 联合汽车电子有限公司 | Electric car charging circuit |
-
2020
- 2020-09-30 CN CN202011054197.9A patent/CN112202339A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004135478A (en) * | 2002-10-15 | 2004-04-30 | Fuji Electric Fa Components & Systems Co Ltd | Step-down, step-up compatible dc-dc converter |
| CN202535116U (en) * | 2012-04-27 | 2012-11-14 | 广东易事特电源股份有限公司 | Solar energy charging circuit |
| CN208638083U (en) * | 2018-08-01 | 2019-03-22 | 联合汽车电子有限公司 | Electric car charging circuit |
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Application publication date: 20210108 |