CN112928914A - Bidirectional direct current converter for electric vehicle - Google Patents
Bidirectional direct current converter for electric vehicle Download PDFInfo
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- CN112928914A CN112928914A CN201911238231.5A CN201911238231A CN112928914A CN 112928914 A CN112928914 A CN 112928914A CN 201911238231 A CN201911238231 A CN 201911238231A CN 112928914 A CN112928914 A CN 112928914A
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Abstract
The invention provides a bidirectional direct current converter for a tramcar, which can solve the problems that the existing converter system has lower working efficiency and the control precision is to be improved, and comprises a direct current conversion circuit component and a control circuit component; the input interface end of the converter is connected with a high-voltage power supply side of the electric car, the output interface end of the converter is connected with a low-voltage auxiliary system of the electric car, the high-voltage power supply side high voltage is converted into low voltage required by the low-voltage auxiliary system by using the direct current conversion circuit assembly and is used for absorbing braking feedback energy when the electric car is in emergency shutdown, and the control circuit assembly acquires the running state information of the direct current conversion circuit assembly and performs constant-voltage current sharing control on the direct current conversion circuit assembly according to the running state information.
Description
Technical Field
The invention relates to the field of circuit control for transportation, in particular to a bidirectional direct current converter for an electric vehicle.
Background
Along with the development of fuel automobiles, the voltage grade of the whole automobile needs to be converted to meet the requirement of a pile auxiliary system, high voltage is reduced to a lower voltage platform required by the auxiliary system, braking feedback energy needs to be absorbed when emergency shutdown is carried out, and voltage between a high-voltage side voltage and a low-voltage side electricity utilization platform needs to be converted and controlled. The existing converter system has low working efficiency and needs to be further improved in control precision.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a bidirectional dc converter for a trolley, so as to solve the problems of low working efficiency and low control accuracy of the conventional converter system.
Based on the above object, the present invention provides a bidirectional dc converter for electric vehicles, which includes a dc conversion circuit component and a control circuit component;
the input interface end of the converter is connected with the high-voltage power supply side of the electric car, the output interface end of the converter is connected with the low-voltage auxiliary system of the electric car, the high-voltage power supply side is converted into the low voltage required by the low-voltage auxiliary system by using the direct-current conversion circuit component, and the direct-current conversion circuit component is used for absorbing braking feedback energy during emergency shutdown;
the control circuit assembly collects and processes the running state information of the direct current conversion circuit assembly and performs constant voltage current sharing control on the direct current conversion circuit assembly according to the running state information.
Optionally, the dc conversion circuit assembly includes a power switch module, a high-frequency energy storage inductor module, and a high-frequency filter capacitor module;
the power switch module comprises a first transistor unit, a second transistor unit, a third transistor unit and a fourth transistor unit;
the first transistor unit and the second transistor unit are connected in series to form a first direct current conversion branch circuit, and the third transistor unit and the fourth transistor unit are connected in series to form a second direct current conversion branch circuit;
the control circuit component controls the on-off state of the transistor units in the first direct current conversion branch and the second direct current conversion branch to perform constant voltage and current sharing control on the direct current conversion circuit component;
the high-frequency energy storage inductor module is arranged at the rear end of the power switch module and comprises a first energy storage inductor and a second energy storage inductor;
one end of the first energy storage inductor is connected with the output interface end, and the other end of the first energy storage inductor is connected between the first transistor unit and the second transistor unit;
one end of the second energy storage inductor is connected with the output interface end, and the other end of the second energy storage inductor is connected between the third transistor unit and the fourth transistor unit;
the high-frequency filter capacitor module comprises a high-voltage side filter capacitor and a low-voltage side filter capacitor, the high-voltage side filter capacitor is connected with the input interface end in parallel, and the low-voltage side filter capacitor is connected with the output interface end in parallel;
the internal structures of the high-voltage side filter capacitor and the low-voltage side filter capacitor are formed by connecting two small capacitors in parallel.
Optionally, the transistor unit is formed by connecting a metal oxide semiconductor field effect transistor and a diode in an anti-parallel connection manner.
Optionally, the dc conversion circuit assembly further includes two Y capacitor plates;
the Y capacitor plate is arranged at the input interface end and connected with the high-voltage side filter capacitor in parallel, and the Y capacitor plate is arranged at the output interface end and connected with the low-voltage side filter capacitor in parallel;
the Y capacitor plate is formed by connecting two sub capacitors in series, and the two sub capacitors are indirectly connected.
Optionally, the dc conversion circuit assembly further includes a discharge resistor, and the discharge resistor is connected in parallel with the input interface end and is used for releasing energy stored in the capacitor when the power supply is stopped.
Optionally, the dc conversion circuit assembly further includes a current detection module and a power distribution connection module;
the current detection module comprises a current detection board and a heat dissipation board, the current detection board is used for accurately collecting the current of each current branch in the direct current conversion circuit assembly and sending the collected data to the control circuit assembly, and the heat dissipation board is arranged close to the current detection board and used for dissipating heat for the current detection board;
the power distribution connection module comprises a fuse, a power distribution line and a power distribution socket and is used for taking power from the output interface end and outputting the power to each electric device in the low-voltage auxiliary system.
Optionally, the control circuit assembly includes a control circuit board and a driving board;
the control circuit board is provided with a direct current conversion circuit operation state information processing unit which is used for processing current information of each branch in the direct current conversion circuit assembly and receiving a high-voltage side voltage signal and a low-voltage side voltage signal;
the driving board is used for driving and controlling the power switch module according to the control signal of the control circuit board.
Optionally, the control circuit component performs constant voltage control on the dc conversion circuit component according to the running state information, and specifically includes:
the control circuit board receives a target instruction and determines an output target voltage according to the target instruction;
determining an initial duty ratio according to the output target voltage, and sending a driving pulse corresponding to the initial duty ratio to the driving board so that the driving board drives the power switch module to output a corresponding voltage;
and the control circuit board receives a low-voltage side voltage signal, compares the low-voltage side voltage signal with the output target voltage, and adjusts the duty ratio of the output driving pulse according to a comparison result until the low-voltage side voltage signal is consistent with the output target voltage.
Optionally, the controlling circuit component performs current-sharing control on the dc conversion circuit component according to the operating state information, and specifically includes:
and performing proportional integral derivative control calculation according to the reference current and the feedback current and performing closed-loop control according to a calculation result by taking the branch current of the second energy storage inductor as the reference current and the branch current of the first energy storage inductor as the feedback current, so that the branch current of the first energy storage inductor is consistent with the branch current of the second energy storage inductor.
Optionally, the bidirectional dc converter for the electric vehicle further includes a box assembly and a high-voltage interlock assembly;
the box body assembly comprises a box body and a cover plate, and the direct current conversion circuit assembly and the control circuit assembly are arranged in a space enclosed by the box body and the cover plate;
the high-voltage interlocking assembly consists of a microswitch and a high-voltage and low-voltage socket interlocking interface;
correspondingly, the control circuit assembly further comprises an interface board, wherein a port for interlocking signal connection is arranged on the interface board and is connected with the high-low voltage socket interlocking interface through the port;
the micro switch is used for interlocking the cover plates, when the cover plates are normally connected, the micro switch is pressed down, the converter interlocking circuit is switched on, and the fault is not triggered;
the high-low voltage socket interlocking interface adopts a plug and socket mutual insertion mode to carry out series connection, and when a certain interface is disconnected, a fault is triggered.
From the above, the bidirectional dc converter for the electric vehicle provided by the invention converts the voltage between the high-voltage side voltage and the low-voltage side power utilization platform by using the dc conversion circuit component, the dc conversion circuit component circuit adopts the staggered-phase high-frequency design, the system working efficiency of voltage conversion can be improved, the voltage conversion of the dc conversion circuit component is controlled by the control circuit component in a closed-loop control mode to perform constant-voltage current sharing control, and the control precision is ensured.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a bidirectional DC converter according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of DC converter circuit components of the bi-directional DC converter according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of a connection structure of control circuit components in the bidirectional DC converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the constant-voltage current-sharing closed-loop control principle in the bidirectional dc converter according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
As shown in fig. 1, some alternative embodiments of the present invention provide a bidirectional dc converter for a tramcar, which includes a dc conversion circuit component 2 and a control circuit component 1;
the input interface end of the converter is connected with the high-voltage power supply side of the electric car, the output interface end of the converter is connected with the low-voltage auxiliary system of the electric car, the high-voltage power supply side is converted into the low voltage required by the low-voltage auxiliary system by using the direct-current conversion circuit component 2, and the low-voltage auxiliary system is used for absorbing braking feedback energy during emergency shutdown;
the control circuit assembly 1 collects and processes the running state information of the direct current conversion circuit assembly 2, and performs constant voltage current sharing control on the direct current conversion circuit assembly 2 according to the running state information.
The bidirectional direct current converter for the electric vehicle utilizes the direct current conversion circuit component to convert the voltage between the high-voltage side voltage and the low-voltage side electricity utilization platform, the direct current conversion circuit component adopts a staggered-phase high-frequency design, the system working efficiency of voltage conversion can be improved, the control circuit component adopts a closed-loop control mode to carry out constant-voltage current-sharing control on the voltage conversion of the direct current conversion circuit component, and the control precision is guaranteed.
As shown in fig. 1, in some alternative embodiments, a bidirectional dc converter for a trolley is provided, where the dc conversion circuit assembly 2 includes a power switch module 21, a high-frequency energy storage inductor module 22, and a high-frequency filter capacitor module 22;
referring to fig. 2, the power switch module 21 includes a first transistor unit Q11, a second transistor unit Q12, a third transistor unit Q21 and a fourth transistor unit Q22;
the first transistor unit Q11 and the second transistor unit Q12 are connected in series to form a first dc conversion branch, which may be referred to as a W-phase current branch;
the third transistor unit Q21 and the fourth transistor unit Q22 are connected in series to form a second dc conversion branch, which may be referred to as an X-phase current branch;
the control circuit assembly 1 controls the on-off state of the transistor units in the first direct current conversion branch (W phase) and the second direct current conversion branch (X phase) to perform constant voltage and current sharing control on the direct current conversion circuit assembly 2;
referring to fig. 2, the high-frequency energy storage inductor module 22 is disposed at the rear end of the power switch module 21, and includes a first energy storage inductor L1 and a second energy storage inductor L2;
one end of the first energy storage inductor L1 is connected to the output interface end, and the other end is connected between the first transistor unit Q11 and the second transistor unit Q12;
one end of the second energy storage inductor L2 is connected to the output interface end, and the other end is connected between the third transistor unit Q21 and the fourth transistor unit Q22;
the high-frequency filter capacitor module comprises a high-voltage side filter capacitor C2 and a low-voltage side filter capacitor C1, the high-voltage side filter capacitor C2 is connected with the input interface end in parallel, and the low-voltage side filter capacitor C1 is connected with the output interface end in parallel;
the internal structures of the high-voltage side filter capacitor C2 and the low-voltage side filter capacitor C1 are formed by connecting two small capacitors in parallel.
Generally, the cut-off frequency of a capacitor is close to the working frequency at high frequency, the capacitors in the high-frequency filter capacitor module are formed by connecting two small capacitors in parallel, the cut-off frequency of a single small capacitor is improved, for the high-voltage side filter capacitor C2 and the low-voltage side filter capacitor C1, the integral equivalent inductance of the high-voltage side filter capacitor C2 is 1/2 of the inductance of the internal small capacitor, and the cut-off frequency after equivalent is consistent with the cut-off frequency of the single internal small capacitor, so that the problem of the cut-off frequency can be solved.
The direct current conversion circuit component adopts a power switch, a high-frequency inductor and a high-frequency capacitor as main elements of a main circuit, and can realize bipolar control of two working modes of voltage increase and reduction on the control logic.
The power switch module 21 is composed of transistor units and is a silicon carbide (SiC) switch module, and such a power switch module has the advantages of high switching frequency, low switching loss and the like, thereby facilitating the improvement of system efficiency, reducing heat generation and improving the overall reliability of the system.
The high-frequency energy storage inductance module 22 is disposed at the rear end of the power switch module 21 and serves as an energy storage element, and in some optional embodiments, the inductance element adopted by the high-frequency energy storage inductance module 22 is an MPP iron-nickel-molybdenum magnetic powder core material, so that design requirements can be better met. The magnetic conductivity of the MPP material is similar to that of the iron powder core, but the magnetic core loss is only less than half of that of the iron powder core, and the inductance element is tightly combined with the box body in an integrated encapsulation mode, so that the heat dissipation area is increased, the design space is reduced, and the power density is improved.
As shown in fig. 2, in some embodiments, the bidirectional dc converter for electric vehicles includes a transistor unit formed by connecting a MOSFET and a diode in an anti-parallel manner.
As shown in fig. 2, in some embodiments, the bidirectional dc converter for a trolley further includes two Y capacitor plates;
the Y capacitor plate is arranged at the input interface end and connected with the high-voltage side filter capacitor in parallel, and the Y capacitor plate is arranged at the output interface end and connected with the low-voltage side filter capacitor in parallel;
the Y capacitor plate is formed by connecting two sub capacitors in series, and the two sub capacitors are indirectly connected.
In the bidirectional direct current converter, a Y capacitor plate is used for electromagnetic compatibility so as to eliminate common-mode interference.
As shown in fig. 2, in some alternative embodiments, the bidirectional dc converter for a train is provided, where the dc conversion circuit assembly 2 further includes a discharge resistor R, and the discharge resistor R is connected in parallel with the input interface terminal and is used for releasing energy stored in the capacitor when the train is stopped.
As shown in fig. 2, in some embodiments, the bidirectional dc converter for a trolley is provided, the dc conversion circuit assembly 2 further includes a current detection module and a power distribution connection module;
the current detection module comprises a current detection plate and a heat dissipation plate, the current detection plate is used for accurately collecting the current of each current branch in the direct current conversion circuit assembly, and referring to fig. 2, the current detection plate collects a W-phase branch current I11 and an X-phase branch current I12;
the current detection board sends acquired data to the control circuit assembly 1, and the heat dissipation plate is arranged close to the current detection board and used for dissipating heat of the current detection board;
in some alternative embodiments, the heat dissipation plate comprises a heat dissipation plate, a heat dissipation block and a water cooling plate, the heat dissipation plate is located between the current detection plate and the heat dissipation block and used for filling the gap and improving the heat dissipation performance, the bottom of the heat dissipation block is coated with heat-conducting silicone grease to contact with the water cooling plate so as to improve the heat dissipation performance,
referring to fig. 2, the power distribution connection module includes fuses (F2, F3, F4), a power distribution line, and a power distribution socket, and is configured to take power from the output interface terminal and output the power to each electric device in the low-voltage auxiliary system.
As shown in fig. 3, in some alternative embodiments, the bidirectional dc converter for a trolley is provided, where the control circuit assembly 1 includes a control circuit board 11 and a driving board 12;
the control circuit board 11 is provided with a dc conversion circuit operation state information receiving unit, which corresponds to the X8/X9 and X2 interfaces of the control circuit board 11 in reference to fig. 3, and is configured to receive current and voltage information of each branch in the dc conversion circuit assembly;
in fig. 3, the X9 interface receives the W-phase branch current I11 and the X-phase branch current I12 detected by the current detection board, and the X8 receives the low-voltage side current collected by the output terminal current sensor, i.e., the output current I1;
the X2 interface in fig. 3 is used to collect the high-side voltage U2 and the low-side voltage U1, and the collected signals are processed in the voltage collecting and processing circuit in the control board to obtain the analytic values.
The driving board is used for driving and controlling the power switch module according to the control signal of the control circuit board.
In some optional embodiment schemes, the control circuit assembly further collects and monitors the temperature of the direct current conversion circuit assembly, integrates the current, voltage and temperature collection and protection functions, and ensures the overall safety performance of the system of the converter.
As shown in fig. 4, in some alternative embodiments, in the bidirectional dc converter for a train, the control circuit component 1 performs constant voltage control on the dc conversion circuit component 2 according to the operation state information, which specifically includes:
the control circuit board 11 receives a target instruction, and determines an output target voltage according to the target instruction;
determining an initial duty ratio according to the output target voltage, and sending a driving pulse corresponding to the initial duty ratio to the driving board 12, so that the driving board 12 drives the power switch module 21 to output a corresponding voltage;
the control circuit board 11 receives a low-voltage side voltage signal, compares the low-voltage side voltage signal with the output target voltage, and adjusts the duty ratio of the output driving pulse according to the comparison result until the low-voltage side voltage signal is consistent with the output target voltage.
As shown in fig. 4, in some optional embodiments, in the bidirectional dc converter for a train, the performing, by the control circuit component 1, current-sharing control on the dc conversion circuit component 2 according to the operation state information specifically includes:
and performing proportional integral derivative control calculation according to the reference current and the feedback current by taking the branch current Ix _ fdb of the second energy storage inductor as the reference current and the branch current Iw _ fdb of the first energy storage inductor as the feedback current, and performing closed-loop control according to the calculation result, so that the branch current of the first energy storage inductor is consistent with the branch current of the second energy storage inductor.
The control circuit component of the bidirectional direct current converter for the electric vehicle is designed with the control scheme, adopts a closed-loop control method, realizes current-sharing control, input current-limiting and output constant-voltage closed-loop control, and has higher control precision.
Some optional embodiments provide that the bidirectional dc converter for electric cars further comprises a box assembly and a high-voltage interlock assembly;
the box body assembly comprises a box body and a cover plate, and the direct current conversion circuit assembly and the control circuit assembly are arranged in a space enclosed by the box body and the cover plate;
the high-voltage interlocking assembly consists of a microswitch and a high-voltage and low-voltage socket interlocking interface;
correspondingly, the control circuit assembly further comprises an interface board, wherein a port for interlocking signal connection is arranged on the interface board and is connected with the high-low voltage socket interlocking interface through the port; the micro switch is used for interlocking the cover plates, when the cover plates are normally connected, the high-voltage micro switch is pressed down, the converter interlocking circuit is switched on, and the fault is not triggered;
the high-low voltage socket interlocking interface adopts a plug and socket mutual insertion mode to carry out series connection, and when a certain interface is disconnected, a fault is triggered.
The on state of the converter interlock circuit may be determined by an external determination circuit.
In the bidirectional direct current converter for the electric car, the high-voltage interlocking component can improve the safety of a high-voltage part system in all directions and monitor the high-voltage state of the whole machine in real time.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A bidirectional DC converter for a tramcar is characterized by comprising a DC conversion circuit component and a control circuit component;
the input interface end of the converter is connected with the high-voltage power supply side of the electric car, the output interface end of the converter is connected with the low-voltage auxiliary system of the electric car, the high-voltage power supply side is converted into the low voltage required by the low-voltage auxiliary system by using the direct-current conversion circuit component, and the direct-current conversion circuit component is used for absorbing braking feedback energy during emergency shutdown;
the control circuit assembly collects and processes the running state information of the direct current conversion circuit assembly and performs constant voltage current sharing control on the direct current conversion circuit assembly according to the running state information.
2. The converter of claim 1, wherein the dc conversion circuit assembly comprises a power switch module, a high frequency energy storage inductor module, and a high frequency filter capacitor module;
the power switch module comprises a first transistor unit, a second transistor unit, a third transistor unit and a fourth transistor unit;
the first transistor unit and the second transistor unit are connected in series to form a first direct current conversion branch circuit, and the third transistor unit and the fourth transistor unit are connected in series to form a second direct current conversion branch circuit;
the control circuit component controls the on-off state of the transistor units in the first direct current conversion branch and the second direct current conversion branch to perform constant voltage and current sharing control on the direct current conversion circuit component;
the high-frequency energy storage inductor module is arranged at the rear end of the power switch module and comprises a first energy storage inductor and a second energy storage inductor;
one end of the first energy storage inductor is connected with the output interface end, and the other end of the first energy storage inductor is connected between the first transistor unit and the second transistor unit;
one end of the second energy storage inductor is connected with the output interface end, and the other end of the second energy storage inductor is connected between the third transistor unit and the fourth transistor unit;
the high-frequency filter capacitor module comprises a high-voltage side filter capacitor and a low-voltage side filter capacitor, the high-voltage side filter capacitor is connected with the input interface end in parallel, and the low-voltage side filter capacitor is connected with the output interface end in parallel;
the internal structures of the high-voltage side filter capacitor and the low-voltage side filter capacitor are formed by connecting two small capacitors in parallel.
3. The converter according to claim 2, wherein the transistor unit is composed of a metal oxide semiconductor field effect transistor and a diode connected in anti-parallel.
4. The converter of claim 2, wherein the dc conversion circuit assembly further comprises two Y capacitor plates;
the Y capacitor plate is arranged at the input interface end and connected with the high-voltage side filter capacitor in parallel, and the Y capacitor plate is arranged at the output interface end and connected with the low-voltage side filter capacitor in parallel;
the Y capacitor plate is formed by connecting two sub capacitors in series, and the two sub capacitors are indirectly connected.
5. The converter of claim 2, wherein the dc conversion circuit assembly further comprises a discharge resistor connected in parallel with the input interface terminal for discharging the stored energy of the capacitor when the converter is shut down.
6. The converter of claim 2, wherein the dc conversion circuit assembly further comprises a current detection module and a power distribution connection module;
the current detection module comprises a current detection board and a heat dissipation board, the current detection board is used for accurately collecting the current of each current branch in the direct current conversion circuit assembly and sending the collected data to the control circuit assembly, and the heat dissipation board is arranged close to the current detection board and used for dissipating heat for the current detection board;
the power distribution connection module comprises a fuse, a power distribution line and a power distribution socket and is used for taking power from the output interface end and outputting the power to each electric device in the low-voltage auxiliary system.
7. The transducer of claim 2, wherein the control circuit assembly includes a control circuit board and a drive board;
the control circuit board is provided with a direct current conversion circuit operation state information processing unit which is used for processing current information of each branch in the direct current conversion circuit assembly and processing a high-voltage side voltage signal and a low-voltage side voltage signal;
the driving board is used for driving and controlling the power switch module according to the control signal of the control circuit board.
8. The converter according to claim 7, wherein the control circuit component performs constant voltage control on the dc conversion circuit component according to the operation state information, and specifically comprises:
the control circuit board receives a target instruction and determines an output target voltage according to the target instruction;
determining an initial duty ratio according to the output target voltage, and sending a driving pulse corresponding to the initial duty ratio to the driving board so that the driving board drives the power switch module to output a corresponding voltage;
and the control circuit board receives a low-voltage side voltage signal, compares the low-voltage side voltage signal with the output target voltage, and adjusts the duty ratio of the output driving pulse according to a comparison result until the low-voltage side voltage signal is consistent with the output target voltage.
9. The converter according to claim 7, wherein the control circuit component performs current-sharing control on the dc conversion circuit component according to the operating status information, and specifically includes:
and performing proportional integral derivative control calculation according to the reference current and the feedback current and performing closed-loop control according to a calculation result by taking the branch current of the second energy storage inductor as the reference current and the branch current of the first energy storage inductor as the feedback current, so that the branch current of the first energy storage inductor is consistent with the branch current of the second energy storage inductor.
10. The transducer of claim 7 further comprising a housing assembly and a high voltage interlock assembly;
the box body assembly comprises a box body and a cover plate, and the direct current conversion circuit assembly and the control circuit assembly are arranged in a space enclosed by the box body and the cover plate;
the high-voltage interlocking assembly consists of a microswitch and a high-voltage and low-voltage socket interlocking interface;
correspondingly, the control circuit assembly further comprises an interface board, wherein a port for interlocking signal connection is arranged on the interface board and is connected with the high-low voltage socket interlocking interface through the port;
the micro switch is used for interlocking the cover plates, when the cover plates are normally connected, the high-voltage micro switch is pressed down, the converter interlocking circuit is switched on, and the fault is not triggered;
the high-low voltage socket interlocking interface adopts a plug and socket mutual insertion mode to carry out series connection, and when a certain interface is disconnected, a fault is triggered.
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| CN201911238231.5A CN112928914A (en) | 2019-12-06 | 2019-12-06 | Bidirectional direct current converter for electric vehicle |
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| CN201911238231.5A CN112928914A (en) | 2019-12-06 | 2019-12-06 | Bidirectional direct current converter for electric vehicle |
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Citations (8)
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