CN110015058B - Charging pile and charging method - Google Patents

Charging pile and charging method Download PDF

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Publication number
CN110015058B
CN110015058B CN201810759077.5A CN201810759077A CN110015058B CN 110015058 B CN110015058 B CN 110015058B CN 201810759077 A CN201810759077 A CN 201810759077A CN 110015058 B CN110015058 B CN 110015058B
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power conversion
circuit
conversion unit
switching
output end
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CN110015058A (en
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熊英杰
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ZTE Corp
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ZTE Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The embodiment of the invention discloses a charging pile and a charging method, wherein the charging pile comprises the following components: the power conversion unit is used for outputting independent voltage, the switching unit is used for switching action, and the bleeding branch circuit is used for switching action. Through the series-parallel switching of the power conversion unit, the problem and the defect that the charging module can only keep constant power output in a certain output voltage range in the prior art can be overcome, and the effect of constant power output in a wide output voltage range can be realized.

Description

Charging pile and charging method
Technical Field
The embodiment of the invention relates to but is not limited to a charging pile and a charging method.
Background
With the increasing shortage of petroleum resources, the pure electric vehicle becomes an important breakthrough in solving the energy crisis in the automobile industry. In recent years, a series of preferential policies and measures for promoting electric vehicles are developed in China, and it is expected that the market of a matched charging system is bright along with the development of the electric vehicle industry.
To realize large-scale popularization and use of electric vehicles, a charging pile with high efficiency, high reliability and wide charging range is indispensable. At present, the electric automobiles commonly used in the market comprise a bus and a car, the voltage of a power battery of the bus is generally over 600V, and the voltage of a power battery of the car is generally about 400V. Because fill electric pile volume miniaturization to and the restriction of various power device capacities, when keeping filling electric pile equal output power, must have great output current when output voltage is lower, and when output voltage is higher, then can bring very big difficulty for the lectotype of device. In order to widen the output voltage range and improve the output power, in the field of electric automobile charging piles, a plurality of machines are commonly connected in series and parallel to realize constant power output in a wide output voltage range, but the cost is high and the control is complex.
In order to adapt to the voltage diversity of the power battery of the electric automobile, the problem that devices with lower performance indexes are selected as far as possible while two indexes of wide output voltage range and constant power output are achieved is solved, and the problem is difficult to solve by the existing topological circuit.
Disclosure of Invention
In view of this, an embodiment of the present invention provides a charging pile, including:
the power conversion unit is used for outputting independent voltages and comprises a power conversion unit 1 and a power conversion unit 2, wherein the power conversion unit 1 outputs independent voltages Vo1+, Vo1-, and the power conversion unit 2 outputs independent voltages Vo2+ and Vo 2-;
a switching unit for switching action, the switching unit comprising a switching unit 1, a switching unit 2 and a switching unit 3; the switching unit 1 is connected in parallel between the positive output terminal of the power conversion unit 1, Vo1+, and the positive output terminal of the power conversion unit 2, Vo2+, the switching unit 2 is connected in parallel between the negative output terminal of the power conversion unit 1, Vo1-, and the negative output terminal of the power conversion unit 2, Vo2-, and the switching unit 3 is connected in parallel between the negative output terminal of the power conversion unit 1, Vo1-, and the positive output terminal of the power conversion unit 2, Vo2 +;
the device comprises a bleeding branch for switching action, wherein the bleeding branch comprises a bleeding branch 1 and a bleeding branch 2; the bleeder branch 1 is connected in parallel between the positive output terminal Vo1+ and the negative output terminal Vo 1-of the power conversion unit 1, and the bleeder branch 2 is connected in parallel between the positive output terminal Vo2+ and the negative output terminal Vo 2-of the power conversion unit 2.
The embodiment of the invention also provides a charging method applied to the charging pile, which comprises the following steps:
when the switching unit 3 is turned off, the switching units 1 and 2 are turned on, a positive output end Vo1+ and a positive output end Vo2+ are connected together through the switching unit 1, a negative output end Vo 1-and a negative output end Vo 2-are connected together through the switching unit 2, the power conversion unit 1 and the power conversion unit 2 are connected in parallel, the total output voltage of the charging pile is equal to the independent output voltage of each path, and the total output current is equal to the sum of the independent output currents of each path.
Compared with the prior art, the embodiment of the invention provides the charging pile and the charging method, and the effect of constant power output in a wide output voltage range can be realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a charging pile according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a charging pile provided in a third embodiment of the present invention;
fig. 3 is a schematic structural diagram of another charging pile provided in the third embodiment of the present invention;
fig. 4 is a schematic diagram of driving voltage waveforms of Q1, Q2, Q3, Q4, and Q5 when the charging pile provided by the third embodiment of the present invention performs series-parallel switching;
fig. 5 is a schematic structural diagram of a charging pile provided in the fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a charging pile provided in the fifth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a charging pile according to a sixth embodiment of the present invention;
fig. 8 is a schematic structural diagram of a charging pile provided by a seventh embodiment of the present invention;
fig. 9 is a schematic structural diagram of a charging pile according to an eighth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a charging pile according to a ninth embodiment of the present invention;
fig. 11 is a schematic structural diagram of a charging pile provided in a tenth embodiment of the present invention;
fig. 12 is a schematic structural diagram of a charging pile provided in an eleventh embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
In the related art, the existing charging pile can only keep constant power output within a certain section of output voltage range, and the whole output range can not be ensured to keep constant power output. In view of this, the embodiment of the present invention provides a new charging pile and a charging method, in which the power conversion units 1 and 2 are switched in series and parallel, so as to achieve the effect of constant power output in a wide output voltage range.
Example one
Fig. 1 is a schematic structural diagram of a charging pile according to an embodiment of the present invention. As shown in fig. 1, the charging pile includes:
the power conversion unit is used for outputting independent voltages and comprises a power conversion unit 1 and a power conversion unit 2, wherein the power conversion unit 1 outputs independent voltages Vo1+, Vo1-, and the power conversion unit 2 outputs independent voltages Vo2+ and Vo 2-;
a switching unit for switching action, the switching unit comprising a switching unit 1, a switching unit 2 and a switching unit 3; the switching unit 1 is connected in parallel between the positive output terminal of the power conversion unit 1, Vo1+, and the positive output terminal of the power conversion unit 2, Vo2+, the switching unit 2 is connected in parallel between the negative output terminal of the power conversion unit 1, Vo1-, and the negative output terminal of the power conversion unit 2, Vo2-, and the switching unit 3 is connected in parallel between the negative output terminal of the power conversion unit 1, Vo1-, and the positive output terminal of the power conversion unit 2, Vo2 +;
the device comprises a bleeding branch for switching action, wherein the bleeding branch comprises a bleeding branch 1 and a bleeding branch 2; the bleeder branch 1 is connected in parallel between the positive output terminal Vo1+ and the negative output terminal Vo 1-of the power conversion unit 1, and the bleeder branch 2 is connected in parallel between the positive output terminal Vo2+ and the negative output terminal Vo 2-of the power conversion unit 2.
The power conversion unit comprises a direct current input source, an LLC resonant conversion circuit and a rectification circuit.
Wherein the switching unit at least comprises one of the following: a switching device or a diode.
The bleeder circuit comprises one or more switching devices and one or more resistors.
The power conversion unit 1 comprises a direct current input source Vi1, an LLC resonant conversion circuit 1 and a rectification circuit 1, wherein the LLC resonant conversion circuit 1 comprises a resonant capacitor Cr1, a resonant inductor Lr1 and a primary excitation winding Lm1 of a main transformer T1, a secondary coil of the main transformer T1 is connected with the rectification circuit 1, and the output ends of the rectification circuit 1 are respectively Vo1+ and Vo 1-;
the power conversion unit 2 comprises a direct current input source Vi2, an LLC resonant conversion circuit 2 and a rectification circuit 2, wherein the LLC resonant conversion circuit 2 comprises a resonant capacitor Cr2, a resonant inductor Lr2 and a primary exciting winding Lm2 of a main transformer T2, a secondary coil of the main transformer T2 is connected with the rectification circuit 2, and the output ends of the rectification circuit 2 are the Vo2+ and the Vo 2-;
the bleeder circuit 1 comprises a filter capacitor C1 and a bleeder circuit 1, the bleeder circuit 1 comprises a resistor R1 and a switching device Q1, the anode of the C1 is connected with the Vo1+, the cathode of the C1 is connected with the Vo1-, the 1 pin of the R1 is connected with the Vo1+, the 2 pin of the R1 is connected with the drain of the Q1, and the source of the Q1 is connected with the Vo 1-;
the bleeder circuit 2 comprises a filter capacitor C2 and a bleeder circuit 2, the bleeder circuit 2 comprises a resistor R2 and a switching device Q2, the anode of the C2 is connected with the Vo2+, the cathode of the C2 is connected with the Vo2-, the 1 pin of the R2 is connected with the Vo2+, the 2 pin of the R2 is connected with the drain of the Q2, and the source of the Q2 is connected with the Vo 2-;
the switching unit 1 comprises a switch Q3, the switching unit 2 comprises a switch Q4, the switching unit 3 comprises switches Q5 and Q6 which are connected in series, the Vo1+ is connected with the cathode of the Q3, the anode of the Q3 is connected with the anode of the Q6, the cathode of the Q6 is connected with the drain of the Q5, the source of the Q5 is connected with the cathode of the Q4, the anode of the Q4 is connected with the Vo2-, the Vo 1-is connected with the source of the Q5, and the Vo2+ is connected with the anode of the Q6.
The rectification circuit is a full-bridge rectification circuit or a full-wave rectification circuit;
the LLC resonant conversion circuit is a half-bridge LLC resonant circuit or a full-bridge LLC resonant circuit;
the half-bridge LLC resonant circuit is a common half-bridge LLC resonant conversion circuit, a half-bridge LLC resonant conversion circuit with a diode clamp, or a three-phase half-bridge LLC resonant conversion circuit.
Wherein the resistors R1, R2 comprise one of a power resistor, a cement resistor, and an aluminum box resistor; the switching devices Q1, Q2 comprise one of a fully-controlled semiconductor switching device, a semi-controlled semiconductor switching device and a low-frequency diode.
Wherein the switches Q3, Q4 and Q6 comprise one of a low-frequency diode, a MOS tube and a fast recovery diode; the switch Q5 comprises one of a fully-controlled semiconductor device, a MOS tube, an IGBT and a relay.
Example two
The second embodiment of the invention provides a charging method applied to the charging pile provided by the first embodiment, and the charging method comprises the following steps:
when the switching unit 3 is turned off, the switching units 1 and 2 are turned on, a positive output end Vo1+ and a positive output end Vo2+ are connected together through the switching unit 1, a negative output end Vo 1-and a negative output end Vo 2-are connected together through the switching unit 2, the power conversion unit 1 and the power conversion unit 2 are connected in parallel, the total output voltage of the charging pile is equal to the independent output voltage of each path, and the total output current is equal to the sum of the independent output currents of each path.
Wherein, the method also comprises:
when the switching unit 3 is switched on, the switching units 1 and 2 are switched off, the positive output end Vo2+ and the negative output end Vo 1-are connected together through the switching unit 3, the power conversion unit 1 and the power conversion unit 2 are connected in series, the total output voltage of the charging pile is equal to the sum of the two independent output voltages, and the total output current is equal to the output current of the two independent outputs.
The technical scheme provided by the first embodiment and the second embodiment of the invention overcomes the problems and the defects that the charging module can only keep constant power output in a certain section of output voltage range in the prior art, and can ensure that the whole output range can keep constant power output.
The technical solutions of the first and second embodiments are described in detail below by means of several specific embodiments.
EXAMPLE III
Fig. 2 is a schematic structural diagram of a charging pile provided in a third embodiment of the present invention, and fig. 3 is a schematic structural diagram of another charging pile provided in the third embodiment of the present invention.
In the third embodiment of the invention, the power conversion unit comprises but is not limited to an input source, an LLC resonant conversion circuit and a rectification circuit, and the series topology of the LLC resonant conversion circuit comprises a common half-bridge type, a half-bridge type with a clamping diode, a full-bridge type, a three-phase half-bridge type and the like; the rectifier circuit may employ a full-bridge rectifier circuit or a full-wave rectifier circuit.
In the third embodiment of the present invention, the switching unit includes, but is not limited to, a switching device or a diode, the switching unit 1 and the switching unit 2 may be fully-controlled or semi-controlled semiconductor switching devices (fig. 3), or may be low-frequency diodes (fig. 2), the switching unit 3 is composed of one diode and 1 fully-controlled semiconductor switching device, and the switching device includes, but is not limited to, a MOSFET and an IGBT. The bleeding unit includes, but is not limited to, a filter capacitor and a bleeding circuit. The filter capacitors include, but are not limited to, one or more filter capacitors connected in series and in parallel. The bleeder circuit comprises, but is not limited to, one or more switching devices, which may be fully-controlled semiconductor switching devices, and one or more resistors, which include, but are not limited to, one of a power resistor, a cement resistor, and an aluminum box resistor.
As shown in fig. 2, the charging pile includes:
the power conversion unit 1 and the power conversion unit 2 have two independent power outputs of Vo1+, Vo1-, Vo2+ and Vo 2-; the two independent power outputs are obtained by two independent power conversion circuits. An electrolytic capacitor C1 and a bleeder circuit 1 are connected between the outputs Vo1+ and Vo 1-of the power conversion unit 1, and an electrolytic capacitor C2 and a bleeder circuit 2 are connected between the outputs Vo2+ and Vo 2-of the power conversion unit 2. The resistors in the bleeder circuits 1 and 2 are cement resistors R1 and R2(R1 and R2 include but are not limited to cement resistors), and the switching devices are fully-controlled semiconductor devices Q1 and Q2(Q1 and Q2 include but are not limited to fully-controlled semiconductor devices MOSFETs). The positive electrode of the C1 is connected with Vo1+, the negative electrode of the C1 is connected with Vo1-, the 1 pin of the R1 is connected with Vo1+, the 2 pin of the R1 is connected with the drain electrode of the Q1, and the source electrode of the Q1 is connected with Vo 1-. The positive electrode of the C2 is connected with Vo2+, the negative electrode of the C2 is connected with Vo2-, the 1 pin of the R2 is connected with Vo2+, the 2 pin of the R2 is connected with the drain electrode of the Q2, and the source electrode of the Q2 is connected with Vo 2-.
Diodes Q3, Q4 are selected as switching devices in the switching units 1, 2 (Q3, Q4 include but are not limited to diodes), and a fully controlled semiconductor device Q5(Q5 includes but is not limited to a fully controlled semiconductor device MOSFET) and a diode Q6(Q6 includes but is not limited to a diode) are selected as switching devices in the switching unit 3. The Vo1+ is connected with the cathode of Q3, the anode of Q3 is connected with the anode of Q6, the cathode of Q6 is connected with the drain of Q5, the source of Q5 is connected with the cathode of Q4, the anode of Q4 is connected with Vo2-, Vo 1-is connected with the source of Q5, and Vo2+ is connected with the anode of Q6.
According to the connection relation, when Q5 is turned off, Q3 and Q4 are turned on, Vo1+ and Vo2+ are connected together through a diode Q3, Vo 1-and Vo 2-are connected together through a diode Q4, at the moment, the total output voltage is equal to the independent output voltage of each path, the total output current is equal to the sum of the independent output currents of each path, and the working mode is a parallel working mode. When Q5 is switched on, Q3 and Q4 are switched off, V02+ and V01-are connected together through a diode Q6 and a switch tube Q5, the two independent outputs are connected in series, the total output voltage is equal to the sum of the two independent output voltages, the total output current is equal to the output current of the two independent outputs, and the working mode is a series working mode. When the output is switched in series-parallel, the driving voltage waveforms of Q1, Q2, Q3, Q4 and Q5 are as shown in FIG. 4.
As shown in fig. 3, the switching unit 1 and the switching unit 2 may also be fully-controlled or half-controlled semiconductor switch devices, and other devices are the same as those in fig. 2 and are not described again.
According to the technical scheme provided by the third embodiment of the invention, the position of the output filter capacitor is changed, so that the low-frequency diode can be selected as the parallel switching tube. By connecting a diode in parallel at the position of the series switching tube, the output end does not need to be additionally connected with a reverse connection prevention diode in series, and online plugging and unplugging can be realized. The scheme not only achieves the effect of constant power output in a wide output voltage range, but also obviously improves the system efficiency and reduces the device cost.
Example four
Fig. 5 is a schematic structural diagram of a charging pile provided in the fourth embodiment of the present invention. As shown in fig. 5, the charging pile includes:
the device comprises two input sources Vi1 and Vi2, two LLC resonant conversion circuits and two rectification circuits.
In the fourth embodiment, the input sources Vi1 and Vi2 are independent dc input sources with equal amplitude, the LLC resonant converting circuit is a half-bridge LLC resonant converting circuit, and the rectifying circuit is a full-bridge rectifying circuit.
The secondary of each half-bridge LLC resonant circuit is connected with a full-bridge rectifying circuit, and the output ends of the two full-bridge rectifying circuits are Vo1+, Vo1-, Vo 2-and Vo 2-. The primary coils of two main transformers T1 and T2 with the same model are respectively connected with a half bridge LLC resonance circuit which works independently, and the two half bridge LLC resonance circuits are respectively provided with resonance capacitors Cr1 and Cr2, resonance inductors Lr1 and Lr2, and primary excitation windings Lm1 and Lm2 of the transformer; the secondary coils of T1 and T2 are connected with a full bridge rectification circuit respectively. A group of filter capacitors C1 and C2 and a group of bleeder circuits 1 and 2 are respectively connected between the output ends Vo1+, Vo 1-and Vo2+ and Vo 2-. The bleeder circuit 1 is composed of 1 cement resistor R1(R1 includes but is not limited to cement resistor) and a fully-controlled semiconductor device Q1(Q1 includes but is not limited to fully-controlled semiconductor device MOSFET). The bleeder circuit 2 is composed of 1 cement resistor R2(R2 includes but is not limited to cement resistor) and a fully-controlled semiconductor device Q2(Q2 includes but is not limited to fully-controlled semiconductor device MOSFET). The positive electrode of the C1 is connected with Vo1+, the negative electrode of the C1 is connected with Vo1-, the 1 pin of the R1 is connected with Vo1+, the 2 pin of the R1 is connected with the drain electrode of the Q1, and the source electrode of the Q1 is connected with Vo 1-. The positive electrode of the C2 is connected with Vo2+, the negative electrode of the C2 is connected with Vo2-, the 1 pin of the R2 is connected with Vo2+, the 2 pin of the R2 is connected with the drain electrode of the Q2, and the source electrode of the Q2 is connected with Vo 2-. Of the three switching units, the switching unit 1 and the switching unit 2 are two low-frequency diodes Q3 and Q4, and the switching unit 3 is composed of a fully-controlled semiconductor device Q5 and a diode Q6 connected in series. The Vo1+ is connected with the cathode of Q3, the anode of Q3 is connected with the anode of Q6, the cathode of Q6 is connected with the drain of Q5, the source of Q5 is connected with the cathode of Q4, the anode of Q4 is connected with Vo2-, the source of Vo 1-is connected with the source of Q5, and the anode of Vo2+ is connected with the anode of Q6. Vo1+, Vo 2-as the total output voltage of the device.
According to the connection relation, when Q5 is turned off, Q3 and Q4 are conducted in the forward direction, Vo1+ and Vo2+ are connected together through a diode Q3, Vo 1-and Vo 2-are connected together through a diode Q4, and the total output voltage is equal to each independent output voltage.
When Q5 is conducted, Q3 and Q4 are turned off, Vo2+ and Vo 1-are connected together through a diode Q6 and a switching tube Q5, two independent outputs are connected in series, the total output voltage is equal to the sum of the two independent output voltages, and the working mode is a series working mode.
Such switching can both broaden the output voltage range and improve the low voltage on-load capability, as shown in fig. 5.
In the fourth embodiment of the invention, the low-frequency diodes adopted by the Q3, the Q4 and the Q6 can also use MOS (metal oxide semiconductor) tubes and fast recovery diodes; the Q5 can adopt MOS tube, IGBT or relay, the circuit is the same as the case. Any switching device or transformer may be simply replaced.
EXAMPLE five
Fig. 6 is a schematic structural diagram of a charging pile provided in the fifth embodiment of the present invention. The difference from the fourth embodiment is that in the fifth embodiment, the secondary terminals of two independent transformers T1 and T2 are connected with a full-wave rectification circuit, as shown in fig. 6; other devices are consistent with fig. 5 and are not described again.
EXAMPLE six
Fig. 7 is a schematic structural diagram of a charging pile provided in a sixth embodiment of the present invention. The difference from the fourth embodiment is that, in the sixth embodiment, the two independently input half-bridge LLC resonant circuits are half-bridge LLC resonant conversion circuits with diode clamps, as shown in fig. 7; other devices are consistent with fig. 5 and are not described again.
EXAMPLE seven
Fig. 8 is a schematic structural diagram of a charging pile provided by the seventh embodiment of the present invention. The difference from the fifth embodiment is that, in the seventh embodiment, the two independently input half-bridge LLC resonant circuits are half-bridge LLC resonant conversion circuits with diode clamps, as shown in fig. 8; other devices are consistent with fig. 6 and are not described again.
Example eight
Fig. 9 is a schematic structural diagram of a charging pile provided in an eighth embodiment of the present invention. The difference from the fourth embodiment is that in the eighth embodiment, two full-bridge LLC resonant conversion circuits are connected to two independent constant-amplitude input sources Vi1 and Vi2, as shown in fig. 9; other devices are consistent with fig. 5 and are not described again.
Example nine
Fig. 10 is a schematic structural diagram of a charging pile provided in the ninth embodiment of the present invention. The difference from the fifth embodiment is that in the ninth embodiment, two full-bridge LLC resonant conversion circuits are connected to two independent constant-amplitude input sources Vi1 and Vi2, as shown in fig. 10; other devices are consistent with fig. 6 and are not described again.
Example ten
Fig. 11 is a schematic structural diagram of a charging pile provided in a tenth embodiment of the present invention. The difference from the fourth embodiment is that in the tenth embodiment, two three-phase half-bridge LLC resonant conversion circuits are connected to two independent constant-amplitude input sources Vi1 and Vi2, and the secondary terminals of three independent transformers T1, T2 and T3 are connected to a three-phase full-wave rectification circuit, as shown in fig. 11; other devices are consistent with fig. 5 and are not described again.
EXAMPLE eleven
Fig. 12 is a schematic structural diagram of a charging pile provided in an eleventh embodiment of the present invention. The difference from the tenth embodiment is that in the eleventh embodiment, Q4 and Q5 become MOS transistors, as shown in fig. 12; other devices are consistent with fig. 11 and are not described again.
According to the technical scheme provided by the fourth, fifth, sixth, seventh, eighth, ninth, tenth and eleventh embodiments of the invention, the rectifying circuit at the output end of the LLC resonant circuit is switched in series and parallel, so that a novel DC/DC converter with wide output range is provided, and the requirements of wide output voltage range and constant power output can be met.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A charging pile, comprising:
the power conversion unit is used for outputting independent voltage and comprises a power conversion unit 1 and a power conversion unit 2, wherein the power conversion unit 1 is provided with a first positive output end and a first negative output end, the first positive output end outputs the independent voltage Vo1+, the first negative output end outputs the independent voltage Vo1-, the power conversion unit 2 is provided with a second positive output end and a second negative output end, the second positive output end outputs the independent voltage Vo2+, and the second negative output end outputs the independent voltage Vo 2-;
a switching unit for switching action, the switching unit comprising a switching unit 1, a switching unit 2 and a switching unit 3; the switching unit 1 is connected in parallel between the first positive output terminal of the power conversion unit 1 and the second positive output terminal of the power conversion unit 2, the switching unit 2 is connected in parallel between the first negative output terminal of the power conversion unit 1 and the second negative output terminal of the power conversion unit 2, and the switching unit 3 is connected in parallel between the first negative output terminal of the power conversion unit 1 and the second positive output terminal of the power conversion unit 2;
the device comprises a bleeding branch for switching action, wherein the bleeding branch comprises a bleeding branch 1 and a bleeding branch 2; the bleeding branch 1 is connected in parallel between the first positive output terminal and the first negative output terminal of the power conversion unit 1, and the bleeding branch 2 is connected in parallel between the second positive output terminal and the second negative output terminal of the power conversion unit 2.
2. The charging pile according to claim 1,
the power conversion unit comprises a direct current input source, an LLC resonant conversion circuit and a rectification circuit.
3. The charging pile according to claim 2,
the switching unit is a switching device.
4. A charging pile according to claim 3,
the bleeder circuit comprises one or more switching devices and one or more resistors.
5. The charging pile according to claim 1,
the power conversion unit 1 comprises a direct current input source Vi1, an LLC resonant conversion circuit 1 and a rectification circuit 1, wherein the LLC resonant conversion circuit 1 comprises a resonant capacitor Cr1, a resonant inductor Lr1 and a primary exciting winding Lm1 of a main transformer T1, a secondary coil of the main transformer T1 is connected to the rectification circuit 1, and output ends of the rectification circuit 1 are the first positive output end and the first negative output end respectively;
the power conversion unit 2 comprises a direct current input source Vi2, an LLC resonant conversion circuit 2 and a rectification circuit 2, the LLC resonant conversion circuit 2 comprises a resonant capacitor Cr2, a resonant inductor Lr2 and a primary exciting winding Lm2 of a main transformer T2, a secondary coil of the main transformer T2 is connected to the rectification circuit 2, and output ends of the rectification circuit 2 are the second positive output end and the second negative output end respectively;
the bleeder circuit 1 comprises a filter capacitor C1 and a bleeder circuit 1, the bleeder circuit 1 comprises a resistor R1 and a switching device Q1, the anode of the C1 is connected with the first positive output terminal, the cathode of the C1 is connected with the first negative output terminal, the pin 1 of the R1 is connected with the first positive output terminal, the pin 2 of the R1 is connected with the drain of the Q1, and the source of the Q1 is connected with the first negative output terminal;
the bleeder circuit 2 comprises a filter capacitor C2 and a bleeder circuit 2, the bleeder circuit 2 comprises a resistor R2 and a switching device Q2, the anode of the C2 is connected with the second positive output terminal, the cathode of the C2 is connected with the second negative output terminal, the pin 1 of the R2 is connected with the second positive output terminal, the pin 2 of the R2 is connected with the drain of the Q2, and the source of the Q2 is connected with the second negative output terminal;
the switching unit 1 comprises a switch Q3, the switching unit 2 comprises a switch Q4, the switching unit 3 comprises switches Q5 and Q6 which are connected in series, the first positive output end is connected with the cathode of the Q3, the anode of the Q3 is connected with the anode of the Q6, the cathode of the Q6 is connected with the drain of the Q5, the source of the Q5 is connected with the cathode of the Q4, the anode of the Q4 is connected with the second negative output end, the first negative output end is connected with the source of the Q5, and the second positive output end is connected with the anode of the Q6.
6. The charging pile according to claim 5,
the rectification circuit is a full-bridge rectification circuit or a full-wave rectification circuit;
the LLC resonant conversion circuit is a half-bridge LLC resonant circuit or a full-bridge LLC resonant circuit;
the half-bridge LLC resonant circuit is a common half-bridge LLC resonant conversion circuit, a half-bridge LLC resonant conversion circuit with a diode clamp, or a three-phase half-bridge LLC resonant conversion circuit.
7. The charging pile according to claim 5,
the resistors R1 and R2 comprise one of a power resistor, a cement resistor and an aluminum box resistor; the switching devices Q1, Q2 comprise one of a fully-controlled semiconductor switching device, a semi-controlled semiconductor switching device and a low-frequency diode.
8. The charging pile according to claim 5,
the switches Q3, Q4 and Q6 comprise one of a low-frequency diode, a MOS (metal oxide semiconductor) tube and a fast recovery diode; the switch Q5 comprises one of a fully-controlled semiconductor device, a MOS tube, an IGBT and a relay.
9. A charging method applied to the charging pile of any one of claims 1 to 6, comprising the following steps:
when the switching unit 3 is turned off, the switching units 1 and 2 are switched on, the first positive output end and the second positive output end are connected together through the switching unit 1, the first negative output end and the second negative output end are connected together through the switching unit 2, the power conversion unit 1 and the power conversion unit 2 are connected in parallel, the total output voltage of the charging pile is equal to the sum of the independent output voltages of all paths, and the total output current is equal to the sum of the independent output currents of all paths.
10. The charging method according to claim 9, characterized in that the method further comprises:
when the switching unit 3 is switched on, the switching units 1 and 2 are switched off, the second positive output end and the first negative output end are connected together through the switching unit 3, the power conversion unit 1 and the power conversion unit 2 are connected in series, the total output voltage of the charging pile is equal to the sum of the two independent output voltages, and the total output current is equal to the output current of the two independent outputs.
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CN113890370B (en) * 2021-09-29 2024-06-14 西安领充创享新能源科技有限公司 Control method and device for series-parallel switching circuit, controller and storage medium
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