KR20150078832A - Robust vechile charge gun contact determination device over external electromagnetic interference signal and on-board battery charger - Google Patents

Robust vechile charge gun contact determination device over external electromagnetic interference signal and on-board battery charger Download PDF

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Publication number
KR20150078832A
KR20150078832A KR1020130168584A KR20130168584A KR20150078832A KR 20150078832 A KR20150078832 A KR 20150078832A KR 1020130168584 A KR1020130168584 A KR 1020130168584A KR 20130168584 A KR20130168584 A KR 20130168584A KR 20150078832 A KR20150078832 A KR 20150078832A
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vehicle
charging
resistor
gun
obc
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KR1020130168584A
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Korean (ko)
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KR101971530B1 (en
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강재준
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주식회사 만도
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The present invention is to solve a problem of traditional proximity detection (PD) circuit and to provide an onboard battery charger (OBC) including a contact determination device of a vehicle charging gun capable of being strong on external electromagnetic interference. According to the contact determination device of the vehicle charging gun which is strong on an external electromagnetic interference signal and the OBC by the present invention, an error in which an MCU misunderstands voltage as a charging mode less than or equal to 3V through the external electromagnetic interference and the start of a vehicle is stopped and can be removed in spite of not having contact with a non-charging mode like the charging gun. The contact determination device of the vehicle charging gun comprises a power stabilization unit and a filtering unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a connection determination device for a car charging gun, which is robust against an external electromagnetic interference signal, and a slow charging device for a vehicle. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

BACKGROUND OF THE INVENTION Field of the Invention [0002] The present invention relates to an OBC for a vehicle, and more particularly to an OBC including a connection determination device for a car charging gun robust against external electromagnetic interference.

Mandatory GHG reduction under the United Nations Framework Convention on Climate Change The state and its subsidiaries are obliged to reduce carbon dioxide and greenhouse gases. In Korea, the Low-Carbon Green Growth Basic Law was enacted to introduce a target management system, and compulsory regulations were imposed on companies subject to greenhouse gas management in order to reduce carbon dioxide and greenhouse gas emissions. As a way to reduce the greenhouse gas emissions of such vehicles, the world's emissions of 19% of the greenhouse gas emissions have been improved by improving the fuel efficiency of vehicles, HEV (Hybrid Electric Vehicle), PHEV (Plug-In Hybrid Electric Vehicle) , EV (Electric Vehicle) and FCEV (Fuel Cell Electric Vehicle).

As part of this policy, the US is supporting $ 2.4 billion in electric vehicle charging infrastructure and electric vehicle parts, and China is also supporting about 17 trillion won in electric vehicle supply. In Korea, To the market of electric vehicles. Thanks to the above-mentioned policy support, the sales volume of electric vehicles among eco-friendly vehicles is expected to increase at an annual average rate of 30%. Of these electric vehicles, HEV and PHEV can achieve higher fuel efficiency than existing internal combustion engines. In particular, pure EVs use only battery power, so there is little carbon dioxide and greenhouse gas emissions, and the advantage of not using fossil fuels Lt; / RTI >

In the case of xEV having the aforementioned advantages, a battery for motor driving is indispensably required unlike the existing internal combustion engine, and a charging device for charging the xEV is also needed to commercialize xEV. This type of charger uses an on-board charger (OBC: On) which has an output range of 3.3 ~ 6.6 [kW] using a stand-type charger and a household power source for rapid charging of more than 50 [kW] -Board Battery Charger. In particular, OBC should be installed inside the vehicle, which is expected to increase in proportion to the growth of the xEV market.

1 is an example of a conventional circuit for detecting a PD (Proximity Detection) signal in a microcontrol unit (MCU) when a charging stand gun and a vehicle slow charging charger are connected.

In car chargers, PD (Proximity Detection) is a signal sensed by the MCU that informs the charging preparation due to a change in resistance value when the charging stand gun and OBC (Vehicle Sink Charger) are connected.

FIG. 1 is a view showing a state in which when the switch SW1 of the charging stand gun is turned off, the combined resistance of R2 and R3 determines the value of AD (analog to digital) in the MCU by the resistances R4 in the OBC and the voltage distribution, (gun) is connected, and starts charging preparation.

When the switch (SW1) of the charging stand gun is off, the impedance of the MCU becomes higher than 4.5V, and when the switch (SW1) of the charging stand gun is turned on, the impedance becomes lower, The level is 2.2 V or less, 3 V or less.

That is, FIG. 1 is a circuit for determining whether or not the charge stand gun is connected according to the voltage level of the PD signal in the MCU of the OBC.

However, in the case where an external electric field, that is, an electromagnetic wave is applied from an external antenna or the like while the charging stand gun is connected to the OBC and charging, the circuit of FIG. 1 is affected by the external electromagnetic wave to be applied and the voltage level of the PD signal in the MCU is changed It may cause malfunction.

For example, when the charging stand gun is not being charged, the voltage level sensed by the MCU port using the circuit of FIG. 1 should be maintained at 4.5V, but the voltage level drops to 3V or lower due to interference of external electromagnetic waves, There is a possibility that the vehicle is malfunctioning and malfunctions and the starting of the vehicle is stopped.

The circuit shown in Fig. 1 shows that the stand gun is pulled out even when the charging stand gun is connected due to the error in recognizing the voltage level of the MCU in the immunity (EMS test) of the ES Spec. Of the car or that the stand gun is engaged even when the stand gun is not connected. May occur.

Such an erroneous operation is a problem because it is erroneously recognized that the vehicle is being charged when the electric vehicle travels in the worst case, and there is a risk that the vehicle may suddenly be stopped during operation.

2 is a diagram showing an example in which the start of the vehicle is stopped by application of an external electromagnetic wave when sensing a PD signal using the circuit of FIG.

FIG. 2 is a diagram showing experimental results of the problem of FIG.

As shown in FIG. 2, when the external electromagnetic wave or electric field is applied, the voltage level recognized by the MCU port suddenly lowers and is recognized as being charged, and the result of stopping the vehicle due to the error of the voltage level recognition can be confirmed.

2 shows the state of the vehicle before the electromagnetic wave is applied from outside, and shows the state of the vehicle when the electromagnetic wave is applied from the outside after the evaluation. After the Ready signal flashes before the evaluation, the low-voltage battery warning light is turned on, It shows that the start is stopped.

The malfunction in Fig. 2 is a direct proof that the circuit in Fig. 1 fails to operate properly when an external electric field is applied.

The present invention solves the problem of the conventional PD recognition circuit and provides an OBC including a device for determining connection of a car charging gun which can be robust against external electromagnetic interference.

According to an aspect of the present invention, there is provided a connection determination apparatus for a car charging gun which is robust against an external electromagnetic interference signal

A power stabilizer for keeping the power of the on-vehicle fast battery charger (OBC) constant; And

And a filtering unit for eliminating interference of external electromagnetic waves applied to the vehicle slow charging unit when the battery is charged or discharged in connection with the vehicle slow charging unit of the vehicle charging gun.

Preferably,

The filtering unit

And a buffer for performing impedance matching between the contact stage of the vehicle charging gun and the MCU (microcontroller unit) stage on the vehicle slow charging device.

Preferably,

The buffer is characterized by being a non-inverted voltage follower comprising an operational amplifier.

Preferably,

The filtering unit

A first resistor at the input of the buffer; And

And a second resistor at an output terminal of the buffer.

Preferably,

The filtering unit

A first capacitor between a contact end of the charging gun and the ground; And

And a second capacitor between the second resistor and the ground.

Preferably,

And a distributor for distributing the power of the on-vehicle fast-charge charger (OBC) when the battery pack is connected or not connected to the vehicle full-speed charger of the vehicle charging gun.

Preferably,

And the distributing unit is a distribution resistor connected between the contact stage and the power source of the vehicle slow charging device (OBC) on the vehicle slow charging device of the car charging gun.

Preferably,

The power stabilizing unit

And a capacitor for keeping the power of the vehicle slow charging device constant.

Preferably,

The first resistor and the second resistor have a magnitude of 1 k ?.

Preferably,

The distribution resistance has a size of 330 [Omega].

Preferably,

And the electromagnetic wave is Radiated immunity (RI).

Preferably,

A voltage detected by the MCU when connected to the vehicle slow charging device of the vehicle charging gun is 2.23 V and a voltage detected by the MCU when the vehicle charging gun is not connected is 4.45 V. [

According to one aspect, the vehicle slow charger

In the on-vehicle full charge charger (OBC)

And a filtering unit for eliminating interference of an external electromagnetic wave applied to the vehicle slow charging device,

A voltage detected by an MCU (micro control unit) when connected to the vehicle slow charging device of the vehicle charging gun is a first voltage, and when the external charging device is not connected to the vehicle fast charging device of the vehicle charging gun, And the voltage detected by the MCU maintains the second voltage.

Preferably,

And the electromagnetic wave is Radiated immunity (RI).

Preferably,

The first voltage is 2.23 V, and the second voltage is 4.45 V. [

Preferably,

And a power stabilization unit for maintaining the power of the on-vehicle fast-charge charger (OBC) constant.

Preferably,

The filtering unit

And a buffer for performing impedance matching between a contact end of the charging gun for the vehicle and an end of the MCU on the vehicle slow charging device.

Preferably,

The buffer is characterized by being a non-inverted voltage follower comprising an operational amplifier.

Preferably,

The filtering unit

A first resistor at the input of the buffer; And

And a second resistor at an output terminal of the buffer.

Preferably,

The filtering unit

A first capacitor between a contact end of the charging gun and the ground; And

And a second capacitor between the second resistor and the ground.

Preferably,

And a distributor for distributing the power of the on-vehicle fast-charge charger (OBC) when the battery pack is connected or not connected to the vehicle full-speed charger of the vehicle charging gun.

Preferably,

And the distributing unit is a distribution resistor connected between the contact stage and the power source of the vehicle slow charging device (OBC) on the vehicle slow charging device of the car charging gun.

Preferably,

The power stabilizing unit

And a capacitor for keeping the power of the vehicle slow charging device constant.

Preferably,

The first resistor and the second resistor have a magnitude of 1 k ?.

Preferably,

The distribution resistance has a size of 330 [Omega].

According to the connection determining device for a vehicle charging gun and the vehicle fast charging device which are robust to the external electromagnetic interference signal according to the present invention, even when the charging mode, i.e., the charging gun is not connected, the MCU recognizes The charging mode is erroneously recognized and the error that stops the vehicle from starting can be eliminated.

1 is an example of a conventional circuit for detecting a PD (Proximity Detection) signal in a microcontrol unit (MCU) when a charging stand gun and a vehicle slow charging charger are connected.
2 is a diagram showing an example in which the start of the vehicle is stopped by application of an external electromagnetic wave when sensing a PD signal using the circuit of FIG.
FIG. 3 is a diagram schematically illustrating a process of acquiring a PD signal in the OBC and a communication process between the VCU (Vehicle Control Unit).
FIG. 4 is a diagram illustrating an experiment of applying an external electromagnetic wave when sensing a PD signal in an MCU of an OBC.
5 is a block diagram of an OBC including an apparatus for determining connection of a car charging gun to a robust external electromagnetic interference signal according to the present invention.
FIG. 6 is a circuit diagram of a robust connection determination apparatus for a car charging gun according to an exemplary embodiment of the present invention. Referring to FIG.
FIG. 7 is a graph showing a result of a case where a malfunction occurs when detecting a PD recognition signal by the OBC including a robust connection determination apparatus for a car charging gun according to the present invention.

Hereinafter, referring to the accompanying drawings, a connection determination device for a vehicle charging gun and a vehicle slow charging device robust to an external electromagnetic interference signal according to an embodiment of the present invention will be described more specifically.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the technical terms described below are defined in consideration of functions and the like in the present invention, and these may be changed according to the intention or custom of the person skilled in the art. Therefore, the definitions of the terms should be judged based on the contents described throughout the specification.

Externally applied electric or electromagnetic waves referred to in the present invention include RADIATED IMMUNITY RI, RADIATED EMISSION RE, CONDUCTED EMISSION CE, TRANSIENT IMMUNITY TI, TRASIENT EMISSION TE, ELECTROSTATIC DISCHARGE can do. An embodiment of the present invention provides a connection determination device for a car charging stand gun that is robust against RADIATED IMMUNITY (RI).

FIG. 3 is a diagram schematically illustrating a process of acquiring a PD signal in the OBC and a communication process between the VCU (Vehicle Control Unit).

3 schematically shows a communication process between the PD signal 411 acquisition process in the MCU of the OBC and the VCU (Vehicle Control Unit) controlling the vehicle using the PD signal obtained in the OBC.

If the voltage level of the PD signal in the OBC is low and it is determined that the OBC is charging, the OBC controls the vehicle to stop the vehicle through CAN communication with the VCU.

FIG. 4 is a diagram illustrating an experiment of applying an external electromagnetic wave when sensing a PD signal in an MCU of an OBC.

A test procedure in which an electric field is applied (520) from a plurality of external antennas during sensing of a PD signal in an OBC MCU.

1 and 2, the PD recognition circuit in FIG. 1 has a problem in that it is sensitive to an external electric field as shown in FIG. 4, causing a malfunction in which the voltage level of a PD signal is changed.

5 is a block diagram of an OBC including an apparatus for determining connection of a car charging gun to a robust external electromagnetic interference signal according to the present invention.

The robust connection determination apparatus for a vehicle charging gun in accordance with the external electromagnetic interference signal of the present invention is configured in the OBC as in FIG.

The on-vehicle fast charging unit (OBC) according to the present invention includes a filtering unit 650 for eliminating the interference of external electromagnetic waves applied from the outside.

The filtering unit 650 is connected to the vehicle slow charging unit of the car charging stand gun even when the external electromagnetic wave is applied, the voltage detected by the MCU (micro control unit) is the first voltage (2.23 V) When not connected to the charger, the voltage detected by the MCU keeps the second voltage (4.45V).

That is, it is one of the features of the present invention that the filtering unit 650 is included to solve the problems of the circuit described in FIG. The electromagnetic waves may be radiated immunity (RI), but this is only an example, and the present invention is not limited thereto.

The filtering unit 650 will be described in greater detail below with reference to FIG. 6, but it is also possible to provide impedance matching between the contact end 640 of the car charging gun and the micro control unit (MCU) The buffer is characterized by being a non-inverted voltage follower (753 of FIG. 6) including an operational amplifier (OP-AMP).

The OBC including the connection determination device of the charging stand gun of the present invention basically includes the circuit structure in Fig. That is, it includes a distribution unit 630 for performing voltage distribution in accordance with the on / off state of the charging stand gun.

The distribution portion 630 is a distribution resistor 330Ω connected between the contact stage 640 and the power source 620 of the on-vehicle fast-charge charger (OBC) on the vehicle full charge charger of the car charging gun.

The on-vehicle fast-charge charger (OBC) may further include a power stabilizing unit 670 for keeping the power source (5V) of the on-vehicle fast-charge charger (OBC) constant. The power stabilizing unit 670 may be constituted by a capacitor that keeps the power of the vehicle slow charging charger constant.

FIG. 6 is a circuit diagram of a robust connection determination apparatus for a car charging gun according to an exemplary embodiment of the present invention. Referring to FIG.

Fig. 6 more specifically shows a circuit constituting a device for judging the connection of a charging gun for a vehicle, which is robust to the external electromagnetic interference signal of the present invention included in the OBC in Fig.

The connection determining apparatus 700 for a car charging gun that is robust against an external electromagnetic interference signal includes a power stabilizing unit 770 for maintaining the power of the vehicle slow charging charger (OBC) constantly, And a filtering unit 750 for eliminating the interference of external electromagnetic waves applied to the vehicle slow charging unit when the vehicle is not connected.

The power stabilizing unit 770 may be a capacitor 1uF that keeps the power source 5V of the vehicle slow charger constant.

The filtering unit 750 includes a buffer 753 for performing impedance matching between the contact stage 740 of the vehicle charging gun and the micro control unit stage on the vehicle slow charging device. The buffer constituting the filtering unit is a non-inverted voltage follower 753 including an operational amplifier.

The filtering unit may further include a first resistor (1 k?) 752 at the input terminal of the buffer and a second resistor (1 k?) 754 at the output terminal of the buffer, and may also be connected between the contact end of the charge gun and the ground And may further include a first capacitor 751 and a second capacitor 755 between the second resistor and the ground.

The connection determining apparatus 700 includes a distributor 730 for distributing the power of the on-vehicle fast-charge charger (OBC) when connected to or disconnected from the on-vehicle fast charger of the vehicle charging gun. The distribution portion 730 is a distribution resistance (330 OMEGA) connected between the contact stage and the power source of the on-vehicle fast charger (OBC) on the vehicle slow charge device of the car charging gun.

In the connection determination device of the charging stand gun of the present invention, when the external electric field is applied, the voltage detected by the MCU is maintained at 2.23 V when connected to the vehicle slow charging device of the car charging gun, The detected voltage can be maintained at 4.45V.

FIG. 7 is a graph showing a result of a case where a malfunction occurs when detecting a PD recognition signal by the OBC including a robust connection determination apparatus for a car charging gun according to the present invention.

FIG. 7 shows that even when an external electromagnetic wave is applied, the voltage signal sensed by the MCU remains constant without change.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but many modifications and equivalents may be resorted to will be. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

600 Connection determination device of car charging gun robust against external electromagnetic interference signal
610 Car Charger
620 power supply
630 voltage distribution section
640 Connection point between charging gun and OB
650 filtering section
660 MCU PD signal detection
670 Power stabilization part
680 Charging gun (GUN)

Claims (25)

  1. A power stabilizer for keeping the power of the on-vehicle fast battery charger (OBC) constant; And
    And a filtering unit for eliminating interference of external electromagnetic waves applied to the vehicle slow charging unit when the vehicle is charged with the vehicle or when the vehicle is not connected to the vehicle slow charging unit of the charging gun of the vehicle. A connection determination device for a car charging gun.
  2. The method according to claim 1,
    The filtering unit
    And a buffer for performing impedance matching between the contact stage of the vehicle charging gun and the micro control unit stage on the vehicle slow charging device. A connection determination device for a charged gun.
  3. The method of claim 2,
    Characterized in that the buffer is a non-inversed voltage follower comprising an operational amplifier. ≪ RTI ID = 0.0 > 11. < / RTI >
  4. The method of claim 2,
    The filtering unit
    A first resistor at the input of the buffer; And
    Further comprising a second resistor at an output terminal of the buffer, wherein the second resistor is connected to the output of the buffer.
  5. The method of claim 4,
    The filtering unit
    A first capacitor between a contact end of the charging gun and the ground; And
    Further comprising a second capacitor between the second resistor and the ground, wherein the second capacitor is connected to the second resistor.
  6. The method according to claim 1,
    Further comprising a distributing unit for distributing the power of the on-vehicle fast-charge charger (OBC) when connected to the vehicle slow charging device of the vehicle charging gun or when it is not connected to the vehicle. A connection determination device for a charged gun.
  7. The method of claim 6,
    Wherein the distributor is a distribution resistor connected between the contact stage and the power source of the vehicle slow charge device (OBC) on the vehicle slow charge device of the vehicle charge gun.
  8. The method according to claim 1,
    The power stabilizing unit
    And a capacitor that keeps the power of the vehicle slow charging device constant in the vehicle.
  9. The method of claim 4,
    Wherein the first resistor and the second resistor have a magnitude of 1 k [Omega], and are robust against an external electromagnetic interference signal.
  10. The method of claim 7,
    Wherein the distribution resistance has a magnitude of 330 OMEGA, and is robust to an external electromagnetic interference signal.
  11. The method according to claim 1,
    Wherein the electromagnetic wave is radiated immunity (RI), wherein the electromagnetic wave is robust against an external electromagnetic interference signal.
  12. The method of claim 2,
    Wherein a voltage detected by the MCU when connected to the vehicle slow charging device of the vehicle charging gun is 2.23 V and a voltage detected by the MCU when the charging gun is disconnected is 4.45 V, An apparatus for judging connection of a car charging gun which is robust to an interference signal.
  13. In the on-vehicle full charge charger (OBC)
    And a filtering unit for eliminating interference of an external electromagnetic wave applied to the vehicle slow charging device,
    A voltage detected by an MCU (micro control unit) when connected to the vehicle slow charging device of the vehicle charging gun is a first voltage, and when the external charging device is not connected to the vehicle fast charging device of the vehicle charging gun, And the voltage detected by the MCU maintains the second voltage.
  14. 14. The method of claim 13,
    Wherein the electromagnetic wave is radiated immunity (RI).
  15. 14. The method of claim 13,
    Wherein the first voltage is 2.23 V and the second voltage is 4.45 V.
  16. 14. The method of claim 13,
    Further comprising: a power stabilizer for maintaining a constant power source of the vehicle slow-charge charger (OBC).
  17. 14. The method of claim 13,
    The filtering unit
    And a buffer for performing impedance matching between a contact end of the charging gun for the vehicle and an end of the micro control unit on the slow charging device for the vehicle.
  18. 18. The method of claim 17,
    Characterized in that the buffer is a non-inverted voltage follower comprising an operational amplifier.
  19. 18. The method of claim 17,
    The filtering unit
    A first resistor at the input of the buffer; And
    And a second resistor at an output end of the buffer.
  20. The method of claim 19,
    The filtering unit
    A first capacitor between a contact end of the charging gun and the ground; And
    And a second capacitor between the second resistor and the ground.
  21. 14. The method of claim 13,
    Further comprising a distributing unit for distributing the power of the on-vehicle fast charging unit (OBC) when the battery pack is connected or not connected to the vehicle slow charging unit of the vehicle charging gun.
  22. 23. The method of claim 21,
    Characterized in that the distributing section is a distribution resistor connected between the contact stage and the power source of the on-vehicle fast charging device (OBC) on the vehicle slow charging device of the car charging gun.
  23. 18. The method of claim 16,
    The power stabilizing unit
    And a capacitor for maintaining the power of the slow charging device for the vehicle constant.
  24. The method of claim 19,
    Wherein the first resistor and the second resistor have a magnitude of 1 k [Omega].
  25. 23. The method of claim 22,
    Wherein the distribution resistor has a size of 330 ohms.
KR1020130168584A 2013-12-31 2013-12-31 Robust vechile charge gun contact determination device over external electromagnetic interference signal and on-board battery charger KR101971530B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05251956A (en) * 1991-12-12 1993-09-28 Natl Semiconductor Corp <Ns> Cascode cmos amplifier with stabilized transient response
US5656947A (en) * 1996-07-16 1997-08-12 National Semiconductor Corporation Low noise digital output buffer
KR20120005725A (en) * 2010-07-09 2012-01-17 (주)브이이엔에스 Electric vehicle
JP2013085442A (en) * 2011-10-11 2013-05-09 Taida Electronic Ind Co Ltd High-voltage battery charging system and charger with such charging system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05251956A (en) * 1991-12-12 1993-09-28 Natl Semiconductor Corp <Ns> Cascode cmos amplifier with stabilized transient response
US5656947A (en) * 1996-07-16 1997-08-12 National Semiconductor Corporation Low noise digital output buffer
KR20120005725A (en) * 2010-07-09 2012-01-17 (주)브이이엔에스 Electric vehicle
JP2013085442A (en) * 2011-10-11 2013-05-09 Taida Electronic Ind Co Ltd High-voltage battery charging system and charger with such charging system

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