CN211741956U

CN211741956U - Power control circuit based on fill electric pile

Info

Publication number: CN211741956U
Application number: CN202020692706.XU
Authority: CN
Inventors: 张健华; 卜争龙
Original assignee: Enyida Power Technology Suzhou Co ltd
Current assignee: Enyida Power Technology Suzhou Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-10-23
Anticipated expiration: 2030-04-29

Abstract

The utility model discloses a power control circuit based on fill electric pile, include: the power conversion device comprises an input unit, a power conversion unit and an output unit which are sequentially connected, wherein the input unit comprises an input interface, an EMI filter circuit and a rectification filter circuit which are sequentially connected, and the power conversion unit comprises a first conversion circuit and a second conversion circuit. The utility model discloses improved circuit structure, power conversion unit adopts two tunnel work in turn, and each branch road of circuit all comprises field effect transistor and diode, can not have direct phenomenon. And the circuit has good overall reliability, higher safety coefficient and better market application value.

Description

Power control circuit based on fill electric pile

Technical Field

The utility model relates to a fill electric pile technical field, specifically relate to a power control circuit based on fill electric pile.

Background

The electric automobile is a vehicle which takes a vehicle-mounted power supply as power and drives wheels to run by using a motor, and meets various requirements of road traffic and safety regulations. The composition comprises: an electric drive and control system, a mechanical system such as a drive transmission, a working device for performing a predetermined task, and the like. The automobile has a small influence on the environment, so that the prospect is widely seen, but the current technology is not mature. With the development of electric automobile technology, especially the increasing of the national atmospheric pollution control, the electric automobile as one of the best substitute products of the traditional power automobile develops rapidly. The charging system is used for providing energy supply for the operation of the electric automobile, is an important basic supporting system of the electric automobile, is also an important link in the commercialization and industrialization processes of the electric automobile, and has very important social benefits and economic benefits as an important matched infrastructure necessary for developing the electric automobile in the charging system.

The existing charging pile generally adopts a cabinet type structure, the interior of the charging pile comprises a fan (comprising a radiator), a power module, a CPU board and a power supply module, and the exterior of the charging pile is externally connected with a three-phase power supply. The three-phase power supply is connected with the power supply module and the power module and used for supplying power to the power supply module and the power module. The power supply module is used for detecting whether the three-phase power is in phase failure or not and supplying power to the CPU and the fan. The CPU is used for controlling the operation of the fan and the power module and receiving the feedback of the power supply module (the power supply feeds back whether the three-phase power supply is in a phase failure state). However, the power module in the prior art has unreasonable design, and the power conversion of the power module mostly adopts a full-bridge converter to realize alternating current-direct current conversion, so that the circuit structure is complex and the risk of direct connection exists.

Therefore, the present inventors have been eagerly required to devise a new technique to improve the problems thereof.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a power control circuit based on fill electric pile, it can provide the structural support of hardware for solving above-mentioned technical problem.

The technical scheme of the utility model is that:

a charging post-based power control circuit, comprising: the power conversion circuit comprises an input unit, a power conversion unit and an output unit which are connected in sequence, wherein the input unit comprises an input interface, an EMI filter circuit and a rectification filter circuit which are connected in sequence, and the power conversion unit comprises a first conversion circuit and a second conversion circuit; the EMI filter circuit comprises an inductor T1A, an inductor T1B, an inductor T1C, a variable resistor VR1, a variable resistor VR2 and a variable resistor VR3, the rectification filter circuit comprises a rectification bridge BD, an inductor L4 and an inductor LB95, wherein an input interface is respectively connected with one ends of the inductor T1A, the inductor T1B and the inductor T1C, and the other ends of the inductor T1A, the inductor T1B and the inductor T1C are connected with the rectification bridge BD; the variable resistor VR1 is arranged between the inductor T1A and the inductor T1B, the variable resistor VR2 is arranged between the inductor T1B and the inductor T1C, and the variable resistor VR3 is arranged between the inductor T1A and the inductor T1C; the first pin of the rectifier bridge BD is connected with the first conversion circuit after passing through the inductor L4 and the inductor LB95 in sequence, and the fifth pin of the rectifier bridge BD is connected with the second conversion circuit.

Preferably, the first conversion circuit comprises a transformer winding TC05B end, a transformer winding TC05C end, a transformer winding TC15A end, a transformer winding TC15B end, a field effect tube QC00, a field effect tube QC10, a diode DC04, a diode DC14, a capacitor CC00, a capacitor CC10, a resistor RC00, a resistor RC01, a resistor RC10 and a resistor RC11, wherein the transformer winding TC05B end is connected with the gate of the field effect tube QC00 after passing through the resistor RC00 and the resistor RC01 in sequence, and the capacitor CC00 and the diode DC04 are connected in series between the drain and the source of the field effect tube QC 00; the end of the transformer winding TC05C is connected with the grid of a field effect tube QC10 after sequentially passing through a resistor RC10 and a resistor RC11, and a capacitor CC10 and a diode DC14 are connected between the drain and the source of the field effect tube QC10 in series; the source electrode of the field effect transistor QC00 is connected with the end of the transformer winding TC15A, and the drain electrode of the field effect transistor QC10 is connected with the end of the transformer winding TC 15B.

Preferably, the second conversion circuit comprises a transformer winding TC25B end, a transformer winding TC25C end, a transformer winding TC35A end, a transformer winding TC35B end, a field effect tube QC20, a field effect tube QC30, a diode DC24, a diode DC34, a capacitor CC20, a capacitor CC30, a resistor RC20, a resistor RC21, a resistor RC30 and a resistor RC31, wherein the transformer winding TC25B end is connected with the gate of the field effect tube QC20 after passing through the resistor RC20 and the resistor RC21 in sequence, and the capacitor CC20 and the diode DC24 are connected in series between the drain and the source of the field effect tube QC 20; the end of the transformer winding TC25C is connected with the grid of a field effect tube QC30 after sequentially passing through a resistor RC30 and a resistor RC31, and a capacitor CC30 and a diode DC34 are connected between the drain and the source of the field effect tube QC30 in series; the source electrode of the field effect transistor QC20 is connected with the end of the transformer winding TC35A, and the drain electrode of the field effect transistor QC30 is connected with the end of the transformer winding TC 35B.

Preferably, the output unit includes a transformer winding TC15C end, a transformer winding TC35C end, a diode DC50, a diode DC51, a diode DC60, a diode DC61, an inductor LC50, an inductor LC60, an output interface J5, an output interface J6, a capacitor CC90, a capacitor CC91, and a capacitor CC92, wherein the transformer winding TC15C end is connected to the output interface J5 after passing through the diode DC51 and the inductor LC50 in sequence, and the diode DC51 is connected in parallel to two ends of the diode DC 50; the terminal of the transformer winding TC35C is connected with an output interface J5 after passing through a diode DC61 and an inductor LC60 in sequence, and a diode DC61 is connected with two ends of a diode DC60 in parallel; the capacitor CC90, the capacitor CC91 and the capacitor CC92 are connected in parallel between the output interface J5 and the output interface J6.

Preferably, the rectifying and filtering circuit further comprises a resistor R1, a resistor R2, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, wherein the resistor R1 and the resistor R2 are arranged at two ends of the inductor L4 in parallel, and the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are sequentially connected between the inductor L4 and the fifth leg of the rectifier bridge BD in series.

Preferably, the model of the rectifier bridge BD is MT 3516.

Adopt above-mentioned technical scheme, the utility model discloses at least, include following beneficial effect:

power control circuit based on fill electric pile, improved circuit structure, the power conversion unit adopts two way alternate work, each branch road of circuit all comprises field effect transistor and diode, can not have direct phenomenon. And the circuit has good overall reliability, higher safety coefficient and better market application value.

Drawings

Fig. 1 is a circuit diagram of an input unit according to the present invention;

fig. 2 is a partial circuit diagram of a power conversion unit according to the present invention;

fig. 3 is a circuit diagram of an output unit according to the present invention;

fig. 4 is a partial circuit diagram of the power conversion unit according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to fig. 4, for meeting the utility model discloses a power control circuit based on fill electric pile, include: the power conversion circuit comprises an input unit, a power conversion unit and an output unit which are connected in sequence, wherein the input unit comprises an input interface, an EMI filter circuit and a rectification filter circuit which are connected in sequence, and the power conversion unit comprises a first conversion circuit and a second conversion circuit; the EMI filter circuit comprises an inductor T1A, an inductor T1B, an inductor T1C, a variable resistor VR1, a variable resistor VR2 and a variable resistor VR3, and the rectification filter circuit comprises but is not limited to a rectifier bridge BD, an inductor L4 and an inductor LB95, wherein input interfaces are respectively connected with one ends of the inductor T1A, the inductor T1B and the inductor T1C, and the other ends of the inductor T1A, the inductor T1B and the inductor T1C are connected with the rectifier bridge BD; the variable resistor VR1 is arranged between the inductor T1A and the inductor T1B, the variable resistor VR2 is arranged between the inductor T1B and the inductor T1C, and the variable resistor VR3 is arranged between the inductor T1A and the inductor T1C; the first pin of the rectifier bridge BD is connected with the first conversion circuit after passing through the inductor L4 and the inductor LB95 in sequence, and the fifth pin of the rectifier bridge BD is connected with the second conversion circuit.

Preferably, the first output unit further includes a chip UC80 (preferably an ACS758 chip) and a chip UC85 (preferably an ACS758 chip) for detecting the output current.

Preferably, the rectifier bridge BD is a three-phase bridge rectifier, and the specific model thereof is MT 3516.

Preferably, all transformers in the present embodiment are high frequency transformers (model number BK3135-KH 3277).

Preferably, as shown in fig. 4, the power conversion unit further includes an oscillating circuit, which includes an oscillating chip U630 (preferably, model UC3825A), a terminal TC05A of the transformer winding, a terminal TC25A of the transformer winding, a terminal TC10C of the transformer winding, a terminal TC30C of the transformer winding, a zener diode DF00, a zener diode DF10, a zener diode DF20, a zener diode DF21, a resistor RF 21, a capacitor CF 21, a transistor QF 21, and a transistor QF 21, wherein the terminal TC05 21 of the transformer winding is connected to emitters of the transistor QF 21 and the transistor QF 21 sequentially through the resistor RF 21 and the capacitor CF 21, the bases of the transistor QF 21 are connected to a fourteenth leg of the oscillating chip U630 through the resistor RF 21, and the capacitor CF 21 is connected in parallel to the terminal CF 21 of the oscillating chip RF 21; the terminal of the transformer winding TC25A is connected with the emitting electrodes of the triode QF10 and the triode QF11 respectively after sequentially passing through the resistor RF10 and the capacitor CF10, the base electrodes of the triode QF10 and the triode QF11 are connected with the eleventh pin of the oscillating chip U630 after passing through the resistor RF12, and the zener diode DF10 is arranged at the two ends of the capacitor CF10 in parallel; the terminal TC10C of the transformer winding is connected with the ninth pin of the oscillating chip U630 after passing through a voltage stabilizing diode DF20 and a resistor RF30 in sequence; and the end of the transformer winding TC30C is connected with the ninth pin of the oscillating chip U630 after passing through a voltage stabilizing diode DF21 and a resistor RF30 in sequence.

The working principle of the embodiment is as follows: the three-phase power supply is connected with an external three-phase power supply through an input interface, sine alternating current is connected into the three-phase power supply, then the sine alternating current is converted into direct current through an EMI filter circuit and a rectification filter circuit, the direct current is converted into square wave alternating current through a power conversion unit, and the square wave alternating current is converted into direct current after being rectified and filtered by a transformer on an output unit and used for supplying power to a battery.

The power module in the prior art has unreasonable design, and the input current end of the power module has the problem of electromagnetic interference, but the EMI filter circuit in the embodiment can not only improve the power factor of a circuit or a system, but also solve the problems of electromagnetic interference (EMI) and electromagnetic compatibility (EMC), and the EMI filter circuit adopts a discrete device, so that the replacement and the maintenance are convenient.

Be provided with a electric capacity CB97 between the high level output of input unit and the low level output, on the one hand, because the characteristic that the both ends voltage of electric capacity can not break suddenly, at this output cross-over connection 1uf following little electric capacity, the interference that the high frequency clutter pulse that can the filtering electric wire netting brought can reduce clutter electron degree circuit has also suppressed the pollution of this circuit work clutter to the electric wire netting simultaneously. On the other hand, a large capacitor is connected across the output terminal, so that the reactive current of the inductive load of the circuit can be absorbed, and the reactive power consumption can be reduced. In this regard, a person skilled in the art may set the size of the capacitor according to actual use requirements, which is not limited in this embodiment.

The power conversion unit is used for converting direct current into square wave alternating current and outputting the square wave alternating current, and the first conversion circuit is connected with the high-level output end of the input unit and used for outputting positive square wave alternating current. The second conversion circuit is connected with the low-level output end of the input unit and used for outputting negative square wave alternating current.

The first output unit is inductively connected with the power conversion unit, wherein the terminal of the transformer winding TC15C is inductively connected with the terminal of the transformer winding TC15A, and the terminal of the transformer winding TC35C is inductively connected with the terminal of the transformer winding TC 35A. The power conversion unit transmits the square wave alternating current to the first output unit, and the first output unit is rectified and filtered by a diode, a capacitor, an inductor and the like and then outputs the square wave alternating current through an output interface J5 and an output interface J6.

Specifically, the first conversion circuit and the second conversion circuit are arranged completely symmetrically. A transformer winding TC15A end, a field effect tube QC00, a diode DC04, a capacitor CC00, a transformer winding TC15B end, a field effect tube QC10, a diode DC14, a capacitor CC10 and the like in the first conversion circuit form a converter. And the transformer winding TC35A end, the field-effect tube QC20, the diode DC24, the capacitor CC20, the transformer winding TC35B end, the field-effect tube QC30, the diode DC34, the capacitor CC30 and the like in the second conversion circuit form another converter. The diode DC50, the diode DC51, the diode DC60 and the diode DC61 are rectifier diodes on the secondary side of the transformer; the diodes DC55 and DC56 are freewheeling diodes; the inductor LC50 and the inductor LC60 are output filter inductors; the capacitor CC70, the capacitor CC71, the capacitor CC75 and the capacitor CC76 are filter capacitors. The principle of the magnetic reset transformer lies in that after one path of the transformer is switched off, after a short dead time, the load current flows after passing through the freewheeling diode, the magnetizing current of the transformer is gradually reduced to zero, and the magnetic reset and energy feedback of the iron core are realized. Then another transformer starts to work, the exciting current of another set of transformers is gradually increased, and the previous process is repeated. The two paths work alternately in a mode of phase difference of 180 degrees. The circuit adopts two paths of alternate work, so that on one hand, the switching stress is reduced, on the other hand, a complex magnetic reset circuit is omitted, and the transformer can be reliably reset. Each branch of the circuit consists of a field effect transistor and a diode, and a straight-through phenomenon cannot occur. It is known that the conventional full bridge circuit has a direct connection risk, and has higher circuit matching requirements and poor stability. By adopting the structure of the embodiment, the feedback of the excitation energy can be realized without adding other loops, the structure is simple, and the loss is low. Meanwhile, the parallel structure reduces the volume of the output filter inductor and reduces the stress of the device, thereby reducing the loss. The circuit has the advantages of good reliability, high frequency, good square waveform, simple process and good market application prospect.

The oscillating circuit is characterized in that the end of a transformer winding TC05A is connected with the end of a transformer winding TC15C in the power conversion unit in a mutual inductance mode; the terminal of the transformer winding TC25A is connected with the terminal of the transformer winding TC25C in the power conversion unit in a mutual inductance mode. An eleventh pin of the oscillation chip U630 induces the first oscillation signal to the second conversion circuit through electronic components such as a resistor RF12, a transistor QF10, a transistor QF11, a capacitor CF10, a resistor RF10, and a terminal of a transformer winding TC 25A. The fourteenth pin of the oscillation chip U630 induces the second oscillation signal to the first conversion circuit through electronic components such as the resistor RF02, the transistor QF00, the transistor QF01, the capacitor CF00, the resistor RF00, and the terminal of the transformer winding TC 05A. The oscillation circuit is matched with the power conversion unit to convert the direct current rectified and filtered by the input unit into square wave alternating current to be output. In addition, the end of a transformer winding TC10C in the oscillating circuit is connected with the end of a transformer winding TC10A in the power conversion unit in a mutual inductance way; the terminal of the transformer winding TC30C is connected with the terminal of the transformer winding TC30A in the power conversion unit in a mutual inductance mode. The mutual inductance of the transformer can be used for detecting the input current, then the judgment of the oscillation chip is carried out, when the input current is overlarge, the signal output is interrupted through the enabling end, the first conversion circuit and the second conversion circuit can be effectively protected, namely, when the current is overlarge, the first conversion circuit and the second conversion circuit are directly shut down. Current protection in the prior art is to output current detection, and this embodiment is at the circuit middle-end, or the input has just considered to carry out current detection, and its whole circuit of protection that can be better further improves holistic factor of safety, improves life.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging post-based power control circuit, comprising: the power conversion circuit comprises an input unit, a power conversion unit and an output unit which are connected in sequence, wherein the input unit comprises an input interface, an EMI filter circuit and a rectification filter circuit which are connected in sequence, and the power conversion unit comprises a first conversion circuit and a second conversion circuit; the EMI filter circuit comprises an inductor T1A, an inductor T1B, an inductor T1C, a variable resistor VR1, a variable resistor VR2 and a variable resistor VR3, the rectification filter circuit comprises a rectification bridge BD, an inductor L4 and an inductor LB95, wherein an input interface is respectively connected with one ends of the inductor T1A, the inductor T1B and the inductor T1C, and the other ends of the inductor T1A, the inductor T1B and the inductor T1C are connected with the rectification bridge BD; the variable resistor VR1 is arranged between the inductor T1A and the inductor T1B, the variable resistor VR2 is arranged between the inductor T1B and the inductor T1C, and the variable resistor VR3 is arranged between the inductor T1A and the inductor T1C; the first pin of the rectifier bridge BD is connected with the first conversion circuit after passing through the inductor L4 and the inductor LB95 in sequence, and the fifth pin of the rectifier bridge BD is connected with the second conversion circuit.

2. The charging post-based power control circuit of claim 1, wherein: the first conversion circuit comprises a transformer winding TC05B end, a transformer winding TC05C end, a transformer winding TC15A end, a transformer winding TC15B end, a field effect tube QC00, a field effect tube QC10, a diode DC04, a diode DC14, a capacitor CC00, a capacitor CC10, a resistor RC00, a resistor RC01, a resistor RC10 and a resistor RC11, wherein the transformer winding TC05B end is connected with the gate of the field effect tube QC00 after sequentially passing through the resistor RC00 and the resistor RC01, and the capacitor CC00 and the diode DC04 are connected between the drain and the source of the field effect tube QC00 in series; the end of the transformer winding TC05C is connected with the grid of a field effect tube QC10 after sequentially passing through a resistor RC10 and a resistor RC11, and a capacitor CC10 and a diode DC14 are connected between the drain and the source of the field effect tube QC10 in series; the source electrode of the field effect transistor QC00 is connected with the end of the transformer winding TC15A, and the drain electrode of the field effect transistor QC10 is connected with the end of the transformer winding TC 15B.

3. The charging post-based power control circuit of claim 1, wherein: the second conversion circuit comprises a transformer winding TC25B end, a transformer winding TC25C end, a transformer winding TC35A end, a transformer winding TC35B end, a field effect tube QC20, a field effect tube QC30, a diode DC24, a diode DC34, a capacitor CC20, a capacitor CC30, a resistor RC20, a resistor RC21, a resistor RC30 and a resistor RC31, wherein the transformer winding TC25B end is connected with the gate of the field effect tube QC20 after sequentially passing through the resistor RC20 and the resistor RC21, and the capacitor CC20 and the diode DC24 are connected between the drain and the source of the field effect tube QC20 in series; the end of the transformer winding TC25C is connected with the grid of a field effect tube QC30 after sequentially passing through a resistor RC30 and a resistor RC31, and a capacitor CC30 and a diode DC34 are connected between the drain and the source of the field effect tube QC30 in series; the source electrode of the field effect transistor QC20 is connected with the end of the transformer winding TC35A, and the drain electrode of the field effect transistor QC30 is connected with the end of the transformer winding TC 35B.

4. The charging post-based power control circuit of claim 1, wherein: the output unit comprises a transformer winding TC15C end, a transformer winding TC35C end, a diode DC50, a diode DC51, a diode DC60, a diode DC61, an inductor LC50, an inductor LC60, an output interface J5, an output interface J6, a capacitor CC90, a capacitor CC91 and a capacitor CC92, wherein the transformer winding TC15C end is connected with the output interface J5 after passing through the diode DC51 and the inductor LC50 in sequence, and the diode DC51 is connected to two ends of the diode DC50 in parallel; the terminal of the transformer winding TC35C is connected with an output interface J5 after passing through a diode DC61 and an inductor LC60 in sequence, and a diode DC61 is connected with two ends of a diode DC60 in parallel; the capacitor CC90, the capacitor CC91 and the capacitor CC92 are connected in parallel between the output interface J5 and the output interface J6.

5. The charging post-based power control circuit of claim 1, wherein: the rectifying and filtering circuit further comprises a resistor R1, a resistor R2, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, wherein the resistor R1 and the resistor R2 are arranged at two ends of the inductor L4 in parallel, and the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are sequentially connected between the inductor L4 and the fifth pin of the rectifier bridge BD in series.

6. The charging post-based power control circuit of claim 1, wherein: the model of the rectifier bridge BD is MT 3516.