CN208127918U - A kind of power distribution unit of DC charging system - Google Patents
A kind of power distribution unit of DC charging system Download PDFInfo
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- CN208127918U CN208127918U CN201820421117.0U CN201820421117U CN208127918U CN 208127918 U CN208127918 U CN 208127918U CN 201820421117 U CN201820421117 U CN 201820421117U CN 208127918 U CN208127918 U CN 208127918U
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- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a kind of power distribution unit of DC charging system, power distribution unit is connected between charging module and charging gun, which is characterized in that power distribution unit includes first switch, second switch, reverse-filling component and controller；Reverse-filling component include metal-oxide-semiconductor and with metal-oxide-semiconductor and the diode that connects, close to one end of charging gun on one end of charging module, the cathode connection metal-oxide-semiconductor of diode on the anode connection metal-oxide-semiconductor of diode；The output end of controller is separately connected the control terminal of first switch, second switch and metal-oxide-semiconductor.The utility model is using metal-oxide-semiconductor and with metal-oxide-semiconductor and the diode that connects is as reverse-filling component, can reduce the loss of diode, the high reliablity of DC charging system.
Description
Technical Field
The utility model relates to an electric automobile technical field that charges especially relates to a direct current charging system's power distribution device.
Background
For a direct current charging system, when an electric vehicle is charged through a charging gun, the on-off between the charging gun and a charging module needs to be controlled through a power distribution module. The current power distribution module mostly adopts the structure shown in fig. 1, wherein D1 is a backflow-preventing rectifier bridge, S1 is a first switch, and S2 is a second switch, and the first switch and the second switch are used for controlling the start and the end of charging. Alternatively, the rectifier bridge may be replaced by a single diode.
However, in the above schemes, D1 is implemented by using a diode component, and in the charging process, all charging current flows to the charging gun through the diode, which may cause large loss of the diode, and the diode has high damage frequency, which affects the overall performance of the dc charging system.
Therefore, how to provide a power distribution apparatus capable of improving the performance of the dc charging system is a problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a direct current charging system's power distribution device adopts MOS pipe and the diode that connects with MOS pipe and connect as preventing flowing backward the subassembly, can reduce the loss of diode, and direct current charging system's reliability is high.
In order to solve the technical problem, the utility model provides a power distribution device of a direct current charging system, which is connected between a charging module and a charging gun, and comprises a first switch, a second switch, a backflow prevention component and a controller;
the backflow preventing component comprises an MOS tube and a diode connected with the MOS tube in parallel, the anode of the diode is connected with one end, close to the charging module, of the MOS tube, and the cathode of the diode is connected with one end, close to the charging gun, of the MOS tube;
the output end of the controller is respectively connected with the first switch, the second switch and the control end of the MOS tube.
Preferably, the MOS transistor is a PMOS, a gate of the PMOS is connected to the controller, a source of the PMOS is connected to an anode of the diode, and a drain of the PMOS is connected to a cathode of the diode.
Preferably, a first end of the first switch is connected to a first output end of the charging module, and a first end of the second switch is connected to a second output end of the charging module; the backflow prevention assembly is connected between the second end of the first switch and the first end of the charging gun in series, and the second end of the second switch is connected with the second end of the charging gun.
Preferably, the backflow prevention assembly further comprises an absorption circuit connected in parallel with two ends of the MOS transistor.
Preferably, the method further comprises the following steps:
a first voltage detection module for detecting an output voltage of the charging module;
a second voltage detection module for detecting an input voltage of the charging gun;
the positive input end and the negative input end of the first voltage detection module are respectively connected with the first output end and the second output end of the charging module; the positive and negative input ends of the second voltage detection module are respectively connected with the first end and the second end of the charging gun; the output ends of the first voltage detection module and the second voltage detection module are connected with the input end of the controller.
Preferably, the second voltage detection module includes a first resistor and a second resistor, a first end of the first resistor is connected to a first end of the charging gun, a second end of the first resistor is connected to a first end of the second resistor and then serves as an output end of the second voltage detection module, and a second end of the second resistor is connected to a second end of the charging gun.
Preferably, the first voltage detection module is a voltage sensor.
Preferably, the method further comprises the following steps:
the positive electrode of the polar capacitor is connected with the positive output end of the charging module, and the negative electrode of the polar capacitor is connected with the negative output end of the charging module.
The utility model provides a direct current charging system's power distribution device adopts MOS pipe and the diode that connects with MOS pipe and connect as preventing flowing backward the subassembly, and wherein, the diode positive pole is connected charging module one side, and rifle one side that charges is connected to the diode negative pole. Under this kind of connected mode, in case the rifle voltage that charges is higher than the module voltage that charges, then the diode can reverse end, if MOS pipe also controls the end this moment, can realize preventing the purpose of flowing backward, and, the utility model discloses in charging process, MOS pipe and diode all are in the on-state, through the MOS pipe reposition of redundant personnel, can reduce the loss of diode, reduce its frequency of damage to improve direct current charging system's reliability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional power distribution apparatus;
fig. 2 is a schematic structural diagram of a power distribution apparatus of a dc charging system according to the present invention.
Detailed Description
The core of the utility model is to provide a direct current charging system's power distribution device, adopt MOS pipe and the diode that connects with MOS pipe and connect as preventing flowing backward the subassembly, can reduce the loss of diode, direct current charging system's reliability is high.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
The utility model provides a power distribution device of direct current charging system, it is shown to refer to fig. 2, and fig. 2 is the utility model provides a pair of direct current charging system's power distribution device's schematic structure diagram.
The power distribution device is connected between the charging module and the charging gun, and comprises a first switch S1, a second switch S2, a backflow prevention component Q1 and a controller;
the backflow preventing component Q1 comprises an MOS tube and a diode connected with the MOS tube in parallel, wherein the anode of the diode is connected with one end, close to the charging module, of the MOS tube, and the cathode of the diode is connected with one end, close to the charging gun, of the MOS tube;
the output end of the controller is respectively connected with the first switch S1, the second switch S2 and the control end of the MOS tube.
In a preferred embodiment, the MOS transistor is a PMOS, the gate of the PMOS is connected with the controller, the source of the PMOS is connected with the anode of the diode, and the drain of the PMOS is connected with the cathode of the diode.
Of course, the MOS transistor herein may also be an NMOS transistor, and the present invention is not limited to the specific type of the MOS transistor.
In one embodiment, the first terminal of the first switch S1 is connected to the first output terminal of the charging module, and the first terminal of the second switch S2 is connected to the second output terminal of the charging module; the backflow prevention component Q1 is connected in series between the second end of the first switch S1 and the first end of the charging gun, and the second end of the second switch S2 is connected with the second end of the charging gun.
In another embodiment, the backflow prevention component Q1 is connected in series between the second end of the second switch S2 and the second end of the charging gun, and the second end of the first switch S1 is connected to the first end of the charging gun. Which kind of connected mode more than specifically adopting, the utility model discloses do not do the injecion.
It is further known that the backflow prevention device Q1 further includes an absorption circuit connected in parallel to two ends of the MOS transistor.
Wherein,
preferably, the power distribution apparatus further includes:
a first voltage detection module for detecting an output voltage of the charging module;
the second voltage detection module is used for detecting the input voltage of the charging gun;
the positive input end and the negative input end of the first voltage detection module are respectively connected with the first output end and the second output end of the charging module; the positive and negative input ends of the second voltage detection module are respectively connected with the first end and the second end of the charging gun; the output ends of the first voltage detection module and the second voltage detection module are both connected with the input end of the controller.
The second voltage detection module comprises a first resistor and a second resistor, the first end of the first resistor is connected with the first end of the charging gun, the second end of the first resistor is connected with the first end of the second resistor and then serves as the output end of the second voltage detection module, and the second end of the second resistor is connected with the second end of the charging gun.
It can be understood that, by selecting the first resistor and the second resistor with specific resistance values, assuming that the negative input terminal of the default charging gun is 0V, the voltage output by the second terminal of the first resistor is received, and then the voltage across the two terminals of the charging gun can be derived.
In addition, the second voltage detection module may further include a third switch, a third resistor, and a fourth resistor.
When the backflow prevention component Q1 is disposed between the first switch S1 and the charging gun, the third switch may be disposed between the backflow prevention component Q1 and the charging gun, or may be disposed between the second switch S2 and the charging gun; when the backflow prevention component Q1 is disposed between the second switch S2 and the charging gun, the third switch may be disposed between the first switch S1 and the charging gun, or may be disposed between the backflow prevention component Q1 and the charging gun. How to set the utility model is not limited. And a series circuit of a third resistor and a fourth resistor is connected in parallel between the first end and the second end of the charging gun, and one end of the third resistor, which is connected with the fourth resistor, is used as the other output end of the second voltage detection module and is connected with the controller.
In addition, the first voltage detection module is a voltage sensor. Certainly, the first voltage detection module may also be another component capable of detecting voltage, and the first voltage detection module may be integrated in the controller, and the corresponding pins of the controller are connected to the two output ends of the charging module; or the first voltage detection module can also be an independent device, and the utility model discloses do not limit this.
Further, the power distribution apparatus further includes:
and the positive electrode of the polar capacitor is connected with the positive output end of the charging module, and the negative electrode of the polar capacitor is connected with the negative output end of the charging module.
It will be appreciated that the above-described,
for convenience of understanding, referring to fig. 2, the following is a specific operation process of the power distribution apparatus in fig. 2:
and (3) charging process:
1. before the charging is started, S1, S2 and Q1 are disconnected, and after the charging module is started, the output voltage Ubus of the charging module is smaller than the voltage Ubat of the charging gun (generally smaller by about 0-10V);
2. closing S1 and S2, wherein the diode in the Q1 body is cut off in the reverse direction, and no current is output;
3. the charging module increases the output voltage Ubus to enable the Ubus to be larger than or equal to Ubat + Ud (Ud is Q1 in vivo diode drop and is about 0.7V), the charging module starts to output current to the charging gun through the diode, and then the battery is charged through the charging gun;
4. the Q1 is driven to be conducted, and after the Q1 works, because the conducting impedance is very low, the loss is very small, and the efficiency of the whole machine can be improved.
And (3) closing process:
1. controlling the Q1 to be closed, and charging current through a Q1 body diode;
2. reducing the output voltage Ubus of the charging module to enable the Ubus to be equal to or less than Ubat +10V, changing the forward conduction of a diode in the Q1 body into the reverse cut-off at the moment, enabling the charging current to be zero, and ending the charging process;
3. the output voltage Ubus of the charging module continuously drops below 60V, and then S1 and S2 are disconnected, so that the charging module and the charging gun are completely disconnected, electrical isolation is realized, and the risk of contact is avoided;
the utility model provides a direct current charging system's power distribution device adopts MOS pipe and the diode that connects with MOS pipe and connect as preventing flowing backward the subassembly, and wherein, the diode positive pole is connected charging module one side, and rifle one side that charges is connected to the diode negative pole. Under this kind of connected mode, in case the rifle voltage that charges is higher than the module voltage that charges, then the diode can reverse end, if MOS pipe also controls the end this moment, can realize preventing the purpose of flowing backward, and, the utility model discloses in charging process, MOS pipe and diode all are in the on-state, through the MOS pipe reposition of redundant personnel, can reduce the loss of diode, reduce its frequency of damage to improve direct current charging system's reliability.
The above embodiments are only preferred embodiments of the present invention, and the above embodiments can be combined at will, and the combined embodiments are also within the scope of the present invention. It should be noted that other modifications and variations which will be apparent to persons skilled in the art without departing from the spirit and scope of the invention are also encompassed by the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
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 (8)
1. A power distribution device of a direct current charging system is connected between a charging module and a charging gun, and is characterized by comprising a first switch, a second switch, a backflow prevention assembly and a controller;
the backflow preventing component comprises an MOS tube and a diode connected with the MOS tube in parallel, the anode of the diode is connected with one end, close to the charging module, of the MOS tube, and the cathode of the diode is connected with one end, close to the charging gun, of the MOS tube;
the output end of the controller is respectively connected with the first switch, the second switch and the control end of the MOS tube.
2. The power distribution device of claim 1, wherein the MOS transistor is a PMOS, a gate of the PMOS is connected to the controller, a source of the PMOS is connected to an anode of the diode, and a drain of the PMOS is connected to a cathode of the diode.
3. The power distribution apparatus according to claim 1 or 2, wherein a first terminal of the first switch is connected to a first output terminal of the charging module, and a first terminal of the second switch is connected to a second output terminal of the charging module; the backflow prevention assembly is connected between the second end of the first switch and the first end of the charging gun in series, and the second end of the second switch is connected with the second end of the charging gun.
4. The power distribution apparatus of claim 3, wherein the backflow prevention assembly further comprises a snubber circuit connected in parallel across the MOS transistor.
5. The power distribution apparatus of claim 4, further comprising:
a first voltage detection module for detecting an output voltage of the charging module;
a second voltage detection module for detecting an input voltage of the charging gun;
the positive input end and the negative input end of the first voltage detection module are respectively connected with the first output end and the second output end of the charging module; the positive and negative input ends of the second voltage detection module are respectively connected with the first end and the second end of the charging gun; the output ends of the first voltage detection module and the second voltage detection module are connected with the input end of the controller.
6. The power distribution device according to claim 5, wherein the second voltage detection module comprises a first resistor and a second resistor, a first end of the first resistor is connected to a first end of the charging gun, a second end of the first resistor is connected to a first end of the second resistor and then serves as an output end of the second voltage detection module, and a second end of the second resistor is connected to a second end of the charging gun.
7. The power distribution apparatus of claim 5, wherein the first voltage detection module is a voltage sensor.
8. The power distribution apparatus of claim 1, further comprising:
the positive electrode of the polar capacitor is connected with the positive output end of the charging module, and the negative electrode of the polar capacitor is connected with the negative output end of the charging module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820421117.0U CN208127918U (en) | 2018-03-27 | 2018-03-27 | A kind of power distribution unit of DC charging system |
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| CN201820421117.0U CN208127918U (en) | 2018-03-27 | 2018-03-27 | A kind of power distribution unit of DC charging system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109552089A (en) * | 2018-12-04 | 2019-04-02 | 广州小鹏汽车科技有限公司 | A kind of charge control method, device, equipment, medium and charging pile |
| CN110021926A (en) * | 2019-05-24 | 2019-07-16 | 西安特锐德智能充电科技有限公司 | A kind of DC output circuit and charging pile |
| CN112737067A (en) * | 2021-03-30 | 2021-04-30 | 深圳英集芯科技股份有限公司 | Protection method, device and system of battery charging circuit |
-
2018
- 2018-03-27 CN CN201820421117.0U patent/CN208127918U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109552089A (en) * | 2018-12-04 | 2019-04-02 | 广州小鹏汽车科技有限公司 | A kind of charge control method, device, equipment, medium and charging pile |
| CN110021926A (en) * | 2019-05-24 | 2019-07-16 | 西安特锐德智能充电科技有限公司 | A kind of DC output circuit and charging pile |
| CN112737067A (en) * | 2021-03-30 | 2021-04-30 | 深圳英集芯科技股份有限公司 | Protection method, device and system of battery charging circuit |
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Address after: 518000 room 118, 1 Kang Hesheng building, 1 Chuang Sheng Road, Xili street, Nanshan District, Shenzhen, Guangdong. Patentee after: SHENZHEN KEHUA HENGSHENG TECHNOLOGY Co.,Ltd. Patentee after: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. Address before: 518000 room 118, 1 Kang Hesheng building, 1 Chuang Sheng Road, Xili street, Nanshan District, Shenzhen, Guangdong. Patentee before: SHENZHEN KEHUA HENGSHENG TECHNOLOGY Co.,Ltd. Patentee before: XIAMEN KEHUA HENGSHENG Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20210107 Address after: 518000 room 118, 1 Kang Hesheng building, 1 Chuang Sheng Road, Xili street, Nanshan District, Shenzhen, Guangdong. Patentee after: SHENZHEN KEHUA HENGSHENG TECHNOLOGY Co.,Ltd. Address before: 518000 room 118, 1 Kang Hesheng building, 1 Chuang Sheng Road, Xili street, Nanshan District, Shenzhen, Guangdong. Patentee before: SHENZHEN KEHUA HENGSHENG TECHNOLOGY Co.,Ltd. Patentee before: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. |