CN212708991U - Vehicle-mounted charger with pre-charging and discharging functions - Google Patents
Vehicle-mounted charger with pre-charging and discharging functions Download PDFInfo
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- CN212708991U CN212708991U CN202021418555.5U CN202021418555U CN212708991U CN 212708991 U CN212708991 U CN 212708991U CN 202021418555 U CN202021418555 U CN 202021418555U CN 212708991 U CN212708991 U CN 212708991U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02T90/14—Plug-in electric vehicles
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a vehicle-mounted charger with pre-charging and discharging functions, which comprises an alternating current input end, a rectifying module, a direct current bus capacitor, a pre-charging module, an alternating current voltage detection module, a direct current voltage detection module and a controller, wherein the pre-charging module comprises a current-limiting resistor and a short-circuit switch which are connected in parallel, and the current-limiting resistor is connected in series between the alternating current input end and the rectifying module; the alternating voltage detection module is connected with the alternating input end and transmits an alternating voltage detection signal to the controller; the direct-current voltage detection module transmits the direct-current bus capacitor voltage to the controller; the controller controls the short-circuit switch to be switched on or off according to the alternating voltage detection signal and the direct current bus capacitor voltage; the rear charger can be quickly reduced to be below the safe voltage when the power is down; the circuit has the advantages of simplicity and low cost.
Description
Technical Field
The utility model relates to an electric automobile technical field especially relates to a take on-vehicle charger of pre-charge and discharge function.
Background
The input end of the vehicle-mounted charger is connected with U, V, W of a three-phase alternating current power supply. The AC/DC converter is connected with a power battery of the electric automobile, and the three-phase alternating current is subjected to active power factor correction and converted into direct current to charge the power battery behind. Three-phase alternating current is connected into a vehicle-mounted charger, and because an internal capacitor has no charge, input impact current is extremely large, the internal circuit is easy to have large impact and danger exists, and a pre-charging circuit needs to be added. When three-phase alternating current is disconnected, because the internal capacitor has charges, in order to meet the requirement that the voltage of the input port in 1S is reduced to below 60V after the input power failure, a discharge circuit needs to be additionally arranged.
The existing vehicle-mounted charger has the defects of larger impulse current of a pre-charging circuit and no discharging function. The defect is a technical problem to be solved urgently in the industry.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned defect that exists among the prior art, the utility model provides a take on-vehicle charger of pre-charge and discharge function.
The utility model adopts the technical scheme that a vehicle-mounted charger with pre-charging and discharging functions is designed, which comprises an alternating current input end, a rectifying module, a direct current bus capacitor, a capacitor bank, a pre-charging module, an alternating current voltage detection module, a direct current voltage detection module and a controller, wherein the alternating current input end, the rectifying module and the direct current bus capacitor are connected in sequence; the alternating voltage detection module is connected with the alternating input end and used for detecting the alternating input voltage of each phase in real time and transmitting a detection signal to the controller; the direct-current voltage detection module is connected with the direct-current bus capacitor and used for detecting the voltage of the direct-current bus capacitor and transmitting the voltage of the direct-current bus capacitor to the controller; and the controller controls the short-circuit switch to be switched on or off according to the alternating-current voltage detection signal and the direct-current bus capacitor voltage.
The current limiting resistor is connected with the diode in series and then connected with the short-circuit switch in parallel.
The alternating current input end is connected with single-phase alternating current, and the pre-charging module is connected in series in a live wire or a zero wire.
The alternating current input end is connected with three-phase alternating current, the U-phase live wire is not connected with the pre-charging module in series, and the V-phase live wire and the W-phase live wire are respectively connected with one pre-charging module in series.
And the cathode of the diode in the V phase is connected with the input end of the V phase, and the cathode of the diode in the W phase is connected with the input end of the W phase.
The capacitor bank comprises a first capacitor, a second capacitor and a third capacitor, the U-phase live wire is connected with one end of the third capacitor C3, the V-phase live wire is connected with one end of the second capacitor C2, the W-phase live wire is connected with one end of the first capacitor C1, and the other ends of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are connected together.
And two ends of the direct current bus capacitor are connected with a discharge module in parallel, and the discharge module discharges under the control of the controller.
The discharging module comprises a discharging resistor R3 and a discharging switch Q1 which are connected in series, and the discharging switch Q1 is controlled by the controller.
The discharging switch Q1 adopts one of semiconductor switch devices such as MOS transistors, IGBTs or the like or relays.
The discharge resistor R3 and the current-limiting resistor adopt common resistors or positive temperature coefficient temperature-sensitive resistors.
The utility model provides a technical scheme's beneficial effect is:
the utility model can increase the functions of pre-charging and discharging, and the instantaneous impact current in the pre-charging stage is basically zero; the requirement that the voltage of the input port in 1S is reduced to below 60V after the input power failure can be realized; the circuit has the advantages of simplicity and low cost.
Drawings
The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings, in which:
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit diagram of the present invention using a single-phase AC power supply;
FIG. 3 is a circuit diagram of the present invention using a three-phase AC power supply;
fig. 4 is a flowchart of the control of the charger when a three-phase ac power supply is used.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model discloses a take on-vehicle charger of pre-charge and discharge function, including AC input end, rectifier module, direct current bus-bar capacitance that connect gradually to and connect the electric capacity group of rectifier module input, still include pre-charge module, alternating voltage detection module, direct current voltage detection module, controller, wherein the pre-charge module includes current limiting resistor and short circuit switch that connect in parallel together, current limiting resistor concatenates between AC input end and rectifier module; the alternating voltage detection module is connected with the alternating input end and used for detecting the alternating input voltage of each phase in real time and transmitting a detection signal to the controller; the direct-current voltage detection module is connected with the direct-current bus capacitor and used for detecting the voltage of the direct-current bus capacitor and transmitting the voltage of the direct-current bus capacitor to the controller; and the controller controls the short-circuit switch to be switched on or off according to the alternating-current voltage detection signal and the direct-current bus capacitor voltage.
The alternating current input end is connected with an external alternating current power supply, alternating current is converted into direct current by the rectifying module and then transmitted to the direct current bus capacitor through the direct current bus, and power is further supplied to a rear end load. The capacitor bank is an on-board charger internal capacitive load, see capacitors C1, C2, C3 in fig. 3. After electrification, a short-circuit switch in the pre-charging module is in a normally open state, the current-limiting direct-current bus capacitor C4 is charged through the current-limiting resistor, meanwhile, the capacitor bank (C1, C2 and C3) is charged, the live wire voltage is detected after the direct-current bus capacitor C4 is fully charged, the corresponding short-circuit switch is closed when the peak point between the live wire voltage line and the live wire line is in a short-circuit state, the current-limiting effect is not generated when the current-limiting resistor is in a short-circuit state, pre-charging is finished, and normal.
In a preferred embodiment, the short-circuit switch is a relay.
In a preferred embodiment, the current limiting resistor is connected in series with a diode and then connected in parallel with the shorting switch. The current limiting resistor is connected with the diode in series, so that reactive current of the capacitor bank (C1, C2 and C3) can be eliminated during pre-charging, and impact current generated by closing the short-circuit switch is reduced or even eliminated.
Referring to fig. 2, the present invention is applicable to single-phase ac. And connecting the alternating current input end with single-phase alternating current, wherein the pre-charging module is connected in series in a live wire or a zero wire. The pre-charge modules are connected in series in the fire line in fig. 2.
Referring to fig. 3, the present invention is applicable to three-phase ac power. And connecting the alternating current input end with three-phase alternating current, wherein the U-phase live wire is not connected with the pre-charging module in series, and the V-phase live wire and the W-phase live wire are respectively connected with one pre-charging module in series. In the preferred embodiment, the cathode of the diode D1 in the V phase is connected to the V phase input terminal, the anode of the diode D1 is connected to the pre-charge resistor R1, and the other end of the resistor is connected to the capacitor C2 and also connected to the three-phase rectifier bridge. One end of the short-circuit switch K1 is connected with V, and the other end is connected with the network between the pre-charging resistor and the capacitor C2. In W, the cathode of the diode D2 is connected with the W-phase input end, the anode of the diode D2 is connected with the pre-charging resistor R2, and the other end of the resistor is connected with the capacitor C1 and is also connected with the three-phase rectifier bridge. One end of the short-circuit switch K2 is connected with W, and the other end is connected with the network between the pre-charging resistor and the capacitor C1. The electric capacity group includes first, second and third electric capacity, the one end of third electric capacity C3 is connected to U looks live wire, the one end of second electric capacity C2 is connected to V looks live wire, the one end of first electric capacity C1 is connected to W looks live wire, and the other end of first electric capacity C1, second electric capacity C2 and third electric capacity C3 links together, is Y shape structure.
To quickly drop the system voltage below the safe voltage after the input is powered down. And two ends of the direct current bus capacitor are connected with a discharge module in parallel, and the discharge module discharges under the control of the controller.
In a preferred embodiment, the discharge module includes a discharge resistor R3 and a discharge switch Q1 connected in series, the discharge switch Q1 being controlled by the controller. The voltage of the input port can be reduced to below 60V in 1S after the input power is cut off, and the related requirements of safe production are met. The vehicle-mounted charger cuts off three-phase power, the internal control circuit detects no input voltage, then the discharging MOS tube Q1 is switched on to discharge, and current is limited through the discharging resistor R3, so that the MOS tube and the discharging resistor are prevented from being damaged due to overlarge discharging current.
The discharge switch Q1 adopts one of MOS tube, IGBT tube or relay.
In a preferred embodiment, the discharge resistor R3 and the current limiting resistor are positive temperature coefficient temperature sensitive resistors. When the temperature is low, the resistance value of the resistor is low, and the resistor can be charged or discharged quickly, when the temperature is high, the resistance value of the resistor is high, the charging or discharging current is low, the resistor and the MOS tube can be prevented from being damaged due to overhigh temperature, a simple negative feedback circuit is formed, and the reliability of the product is greatly improved.
Fig. 4 is a flowchart illustrating the control of the charger using the three-phase ac power source according to the present invention, and the control principle of the preferred embodiment of the present invention is described below with reference to fig. 3 and 4. The description is intended to be illustrative of the invention and should not be taken to be limiting.
The vehicle-mounted charger is connected with three-phase power immediately, the K1 and the K2 are in normally open states, due to the fact that D1-D8 exist, only U phase can charge the capacitors C1, C2, C3 and C4, all the capacitors can be charged only and cannot be discharged, reactive current does not exist in the pre-charging stage, partial loss of the capacitors is reduced, charging current is limited by R1 and R2, and input impact current is controllable. At the moment, the control circuit continuously detects input three-phase voltage and direct-current bus capacitor voltage, detects that a direct-current bus capacitor C4 is basically not changed any more, then detects that the VU line voltage is at a negative peak value, the pre-charging relay K1 can be closed at a zero voltage position, the current of the relay is 0 through K1 at the moment, the WU line voltage is at the negative peak value, the pre-charging relay K2 can be closed at the zero voltage position, the current of the relay is 0 through K2 at the moment, and the aim that no impact current and no reactive current exist in the pre-charging stage when the K1 and the K2 are closed.
In addition, the technical scheme for detecting that the direct current bus capacitor C4 is not changed basically can be replaced by the technical scheme for detecting the voltage of the direct current bus capacitor C4. The controller receives a zero crossing point signal and the direct current bus capacitor voltage, and closes the short-circuit switch after the direct current bus capacitor voltage reaches a line-to-line voltage peak value and when the line-to-line voltage peak value corresponding to the input alternating current is reached.
The foregoing examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the claims of the present application.
Claims (10)
1. The utility model provides a take on-vehicle charger of pre-charge and discharge function, is including the AC input end, rectifier module, the direct current bus capacitance who connect gradually to and connect the electric capacity group of rectifier module input, its characterized in that: the device also comprises a pre-charging module, an alternating voltage detection module, a direct voltage detection module and a controller, wherein
The pre-charging module comprises a current-limiting resistor and a short-circuit switch which are connected in parallel, and the current-limiting resistor is connected between the alternating current input end and the rectifying module in series;
the alternating voltage detection module is connected with the alternating input end and used for detecting the alternating input voltage of each phase in real time and transmitting a detection signal to the controller;
the direct-current voltage detection module is connected with the direct-current bus capacitor and used for detecting the voltage of the direct-current bus capacitor and transmitting the voltage of the direct-current bus capacitor to the controller;
and the controller controls the short-circuit switch to be switched on or off according to the alternating-current voltage detection signal and the direct-current bus capacitor voltage.
2. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 1, wherein: the current limiting resistor is connected with the diode in series and then connected with the short-circuit switch in parallel.
3. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 2, wherein: the alternating current input end is connected with single-phase alternating current, and the pre-charging module is connected in series in a live wire or a zero wire.
4. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 2, wherein: the alternating current input end is connected with three-phase alternating current, the U-phase live wire is not connected with the pre-charging module in series, and the V-phase live wire and the W-phase live wire are respectively connected with one pre-charging module in series.
5. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 4, wherein: and the cathode of the diode in the V phase is connected with the input end of the V phase, and the cathode of the diode in the W phase is connected with the input end of the W phase.
6. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 5, wherein: the capacitor bank comprises a first capacitor, a second capacitor and a third capacitor, the U-phase live wire is connected with one end of the third capacitor C3, the V-phase live wire is connected with one end of the second capacitor C2, the W-phase live wire is connected with one end of the first capacitor C1, and the other ends of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are connected together.
7. The vehicle-mounted charger with pre-charging and discharging functions as claimed in any one of claims 1 to 6, wherein: and two ends of the direct current bus capacitor are connected with a discharge module in parallel, and the discharge module discharges under the control of the controller.
8. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 7, wherein: the discharging module comprises a discharging resistor R3 and a discharging switch Q1 which are connected in series, and the discharging switch Q1 is controlled by the controller.
9. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 8, wherein: the discharge switch Q1 adopts one of MOS tube, IGBT tube or relay.
10. The vehicle-mounted charger with pre-charging and discharging functions as claimed in claim 8, wherein: the discharge resistor R3 and the current-limiting resistor adopt common resistors or positive temperature coefficient temperature-sensitive resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021418555.5U CN212708991U (en) | 2020-07-17 | 2020-07-17 | Vehicle-mounted charger with pre-charging and discharging functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021418555.5U CN212708991U (en) | 2020-07-17 | 2020-07-17 | Vehicle-mounted charger with pre-charging and discharging functions |
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| Publication Number | Publication Date |
|---|---|
| CN212708991U true CN212708991U (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021418555.5U Active CN212708991U (en) | 2020-07-17 | 2020-07-17 | Vehicle-mounted charger with pre-charging and discharging functions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113442775A (en) * | 2021-07-23 | 2021-09-28 | 长春捷翼汽车零部件有限公司 | Charging and discharging control method, charging device and storage medium |
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2020
- 2020-07-17 CN CN202021418555.5U patent/CN212708991U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113442775A (en) * | 2021-07-23 | 2021-09-28 | 长春捷翼汽车零部件有限公司 | Charging and discharging control method, charging device and storage medium |
| WO2023001009A1 (en) * | 2021-07-23 | 2023-01-26 | 长春捷翼汽车零部件有限公司 | Charging/discharging control method, charging device, and storage medium |
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