KR20070101703A - Base station antenna of passive keyless entry system in vehicle - Google Patents

Abstract

A base station antenna of a passive keyless entry system for a vehicle is provided to operate stably the base station antenna by minimizing influence of wiring arrangement in a vehicle. A base station antenna(1) of a passive keyless entry system for a vehicle includes an antenna driver circuit(10), transformer driver switching elements(20a,20b), a transformer(30), and an antenna(40). The antenna driver circuit generates pulses in the frequency corresponding to the resonance frequency of a transponder. The transformer driver switching elements are connected to the antenna driver circuit, and turned on/off by the pulses generated from the antenna driver circuit. The transformer is connected to the transformer driver switching elements, and generates voltages in accordance with the applied current. The antenna is connected to the transformer, and transmits energy and signals to the transponder by the applied voltage.

Description

Base station antenna of Passive Keyless Entry System in vehicle

1 is a circuit diagram schematically showing a base station antenna of a vehicle PKE system according to the present invention.

Brief description of symbols for the main parts of the drawings

1: Base Station Antenna,

10: antenna driver circuit (Antenna Driver Circuit),

20a, 20b: Transformer Driver Switching element,

30: transformer,

30a: transformer primary side coil,

30b: transformer secondary side coil,

40: antenna,

50: Low-Frequency Rrsponse Detection Circuit.

The present invention relates to a PKE system for a vehicle, and more particularly, a transformer is installed inside a base station installed in a vehicle, and the primary side is formed by varying the ratio of the number of coil turns of the primary side and the number of coils of the secondary side of the transformer. Since the driving voltage and the secondary side driving voltage are generated differently and directly connected to the base station antenna, the base station antenna installed in the vehicle can be driven more stably by minimizing the effects of wiring arrangement inside the vehicle. Due to the disturbance caused by the internal factors of the vehicle, it is possible to reduce trouble factors, production time, cost, etc. that occur during vehicle production, and it is easy to apply the base of the vehicle PKE system regardless of the vehicle type. It relates to a station antenna.

In general, a Passive Keyless Entry System (PKE) system is a system in which a driver or owner of a vehicle wirelessly controls a vehicle in a proximity position of a vehicle. Currently, a door unlock, a lock, It is used for starting a vehicle.

The PKE system is largely classified into a transponder (Tansponder) owned by the driver or the owner of the vehicle and a base station installed in the vehicle to wirelessly transmit / receive various types of information.

Here, the transponder of the PKE system includes a general wireless ignition key or a smart card owned by the driver or the owner of the vehicle, supplies energy and signals to the base station installed in the vehicle, and is connected to each part of the vehicle to perform an operation. To control.

Meanwhile, an RLC series resonant circuit in which a resistor R, a magnetic inductance L, and a capacitance C are connected in series is used as a method of transmitting a signal from a base station installed in a vehicle to a transponder.

The RLC series resonant circuit is configured to configure the base station antenna by configuring the LC series circuit inside the antenna of the transponder and configuring the RLC series resonant circuit by connecting a series resistor at the base station.

The method described above is difficult to tune when applied to a real vehicle because component characteristics with the base station antenna installed in each part of the vehicle are easily affected by the internal wiring shape and layout of the vehicle. Occurred.

In addition, there is a problem in that the low frequency response from the transponder is not easy to use because the LC series circuit is configured inside the antenna of the transponder.

The present invention has been made to solve the problems described above, by installing a transformer (transformer) inside the base station to be installed in the vehicle, by varying the ratio of the number of coil windings of the primary side and the secondary coil windings of the transformer By connecting the primary side drive voltage and the secondary side drive voltage differently and directly connecting to the base station antenna, it is possible to drive the base station antenna installed in the vehicle more stably by minimizing the effects of wiring arrangement inside the vehicle. As a result, it is possible to reduce trouble factors, production time, and cost that occur during vehicle production due to disturbances caused by internal factors of the vehicle, and can be easily applied regardless of the vehicle type. It is an object to provide a base station antenna of the system.

According to an aspect of the present invention, there is provided a vehicle PKE system including a transponder and a base station, comprising: an antenna driver circuit for generating a pulse at a frequency corresponding to a resonance frequency of the transponder; A switching element for a transformer driver connected to the antenna driver circuit and turned on / off by a pulse provided from the antenna driver circuit; A transformer connected to each of the transformer driver switching elements and generating a voltage according to an applied current; And an antenna connected to the transformer and transferring energy and a signal to a transponder by an applied voltage. Characterized in that comprises a.

Preferably, the transformer is composed of a transformer primary side coil and a transformer secondary side coil, the number of windings of the transformer secondary side coil is wound so that n times the number of turns of the transformer primary side coil is generated in the transformer secondary side coil The driving voltage is generated so that n times the driving voltage generated in the transformer primary side coil.

Alternatively, a ferrite coil is wound to prevent distortion of the waveform between the transformer primary side coil and the transformer secondary side coil.

In addition, the transformer secondary side coil is configured to be controllably connected to various antennas installed in the vehicle.

On the other hand, the switching element for the transformer driver is composed of a device capable of preventing overvoltage due to the switching of the transformer.

The transformer driver switching element further includes a protection circuit capable of preventing overvoltage due to switching of the transformer.

Here, the transformer further includes a low frequency response detection circuit for detecting a weak signal transmitted from the transponder to the antenna.

Meanwhile, the low frequency response detection circuit is configured to control each component in the vehicle in response to the response of the transponder from the detected signal.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the vehicle PKE system according to the present invention, since the basic configuration and structure of the vehicle are the same as in the prior art, a detailed description of the above-described configuration will be omitted.

1 is a circuit diagram schematically showing a base station antenna of a vehicle PKE system according to the present invention.

As shown in the drawings, the base station antenna 1 of the vehicle PKE system according to the present invention includes a transponder (not shown) owned by the driver or the owner of the vehicle and a base station (not shown) installed in the vehicle. And an antenna driver circuit (10, Antenna Driver Circuit), a transformer driver switching device (Transformer Driver Swithing) elements (20a, 20b) and a transformer (30, Transformer) and antenna (40, Antenna) Consists of the configuration.

The antenna driver circuit 10 generates a pulse at a frequency corresponding to the resonant frequency of the transponder of the driver or the owner of the vehicle.

The transformer drivers switching elements 20a and 20b are connected to the antenna driver circuit 10 and are turned on / off by a pulse provided from the antenna driver circuit 10.

Here, two transformer driver switching elements 20a and 20b are connected to the antenna driver circuit 10, and each of the antenna driver circuits 10 has a resistance in place.

On the other hand, the transformer driver switching elements (20a, 20b) is preferably made of a device capable of preventing overvoltage due to the switching of the transformer 30 is preferably made to prevent damage due to overvoltage.

The transformer driver switching elements 20a and 20b may further include a protection circuit capable of preventing overvoltage due to switching of the transformer 30 to prevent damage due to overvoltage.

The transformer 30 is connected to each of the transformer driver switching elements 20a and 20b, and is configured to generate a voltage according to an applied current. For this purpose, the transformer 30 is a transformer primary coil 30a. And a transformer secondary side coil 30b, and the number of turns of the transformer secondary side coil 30b is wound so that n times the number of turns of the transformer primary side coil 30a is generated in the transformer secondary side coil 30b. The driving voltage to be generated is n times the driving voltage generated in the transformer primary side coil 30a.

Here, a ferrite coil is wound in order to prevent distortion of the waveform between the transformer primary side coil 30a and the transformer secondary side coil 30b.

In an embodiment of the present invention, a ferrite coil is wound to prevent distortion of the waveform between the transformer primary side coil 30a and the transformer secondary side coil 30b, but the transformer primary side coil 30a and transformer 2 If it is possible to prevent the distortion of the waveform between the vehicle side coil (30b) it may be made so that the coil of various other materials are wound.

On the other hand, the transformer secondary coil 30b is made to be controllably connected to various antennas installed in the vehicle.

The antenna 40 is connected to the transformer 30, and is configured to transfer energy and signals to the transponder by the applied voltage.

Meanwhile, the transformer 30 further includes a low frequency response detection circuit 50 for detecting a weak signal transmitted from the transponder to the antenna 40.

The low frequency response detection circuit 50 is configured to control each component in the vehicle in response to the response of the transponder from the detected signal.

Hereinafter, a driving process of the base station antenna of the vehicle PKE system according to the present invention will be described.

First, in the antenna driver circuit 10 of the base station antenna 1 installed in a vehicle, the operation of each part is changed to a frequency corresponding to the resonant frequency of a transponder owned by the driver or the owner of the vehicle. Generates a pulse to turn on / off (20a, 20b).

In response to the pulse generated in this way, when the switching elements 20a and 20b for the transformer driver are turned on / off, a current is applied to the transformer primary side coil 30a of the transformer 30, and the transformer primary side coil 30a A voltage is generated in the transformer secondary coil 30b in proportion to the number of wound turns.

At this time, the winding number of the transformer secondary side coil (30b) is wound so that n times the number of turns of the transformer primary side coil (30a) is a driving voltage generated in the transformer secondary side coil (30b) is the transformer primary side coil ( A predetermined voltage is generated in the transformer secondary side coil 30b by being generated n times the driving voltage generated in 30a).

As described above, the voltage generated from the transformer secondary coil 30b is input to the antenna 40 and then energy and signals are transmitted to the transponder of the driver or the owner of the vehicle by the antenna 40.

Here, the weak signal transmitted from the transponder to the antenna 40 is detected by the low frequency response detection circuit 50 provided in the transformer secondary side coil 30b, and the signal detected through the low frequency response circuit. It is possible to control each other component in the vehicle in response to the response of the transponder of the driver or owner of the vehicle.

As described above, the transformer 30 and its driving circuit are configured such that n times the driving voltage generated by the transformer primary side coil 30a is generated on the transformer secondary side, and then only the transformer secondary side L (Inductor Coil) component is used. By directly connecting the configured antenna circuit it is possible to drive a stable base station antenna (1) by minimizing the effects of wiring arrangement inside the vehicle.

While the invention has been shown and described with respect to particular embodiments, it will be understood by those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can grow up easily.

As described above, the present invention having the configuration as described above is provided with a transformer (Transformer) inside the base station to be installed in the vehicle, by varying the ratio of the number of coil windings of the primary side and the secondary coil windings of the transformer By generating the primary side drive voltage and the secondary side drive voltage differently and connecting them directly to the base station antenna, the base station antenna installed in the vehicle can be driven more stably by minimizing the effects of wiring arrangement inside the vehicle. As a result, it is possible to reduce trouble factors, production time, cost, etc. that occur during vehicle production due to disturbance due to internal factors of the vehicle, and can be easily applied regardless of vehicle type. It can work.

Claims (8)

In a vehicle PKE system comprising a transponder and a base station, An antenna driver circuit (10) for generating a pulse at a frequency corresponding to the resonant frequency of the transponder; A transformer driver switching element (20a, 20b) connected to the antenna driver circuit (10), which is turned on / off by a pulse provided from the antenna driver circuit (10); A transformer 30 connected to each of the transformer driver switching elements 20a and 20b for generating a voltage according to an applied current; And An antenna 40 connected to the transformer 30 to transmit energy and a signal to a transponder by an applied voltage; Base station antenna of a vehicle PKE system, characterized in that comprises a. The method of claim 1, The transformer 30 includes a transformer primary side coil 30a and a transformer secondary side coil 30b, wherein the number of turns of the transformer secondary side coil 30b is n of the number of turns of the transformer primary side coil 30a. Base station antenna of the PKE system for a vehicle, characterized in that the winding is made so that the drive voltage generated in the transformer secondary side coil (30b) is generated n times the drive voltage generated in the transformer primary side coil (30a). The method of claim 2, A base station antenna of a vehicle PKE system, characterized in that a ferrite coil is wound to prevent distortion of the waveform between the transformer primary side coil (30a) and the transformer secondary side coil (30b). The method of claim 2, The transformer secondary side coil (30b) is a base station antenna of the vehicle PKE system, characterized in that the control is made to be connected to various antennas installed in the vehicle. The method of claim 1, The transformer driver switching element (20a, 20b) is a base station antenna of the vehicle PKE system, characterized in that the element is made of a component that can prevent the overvoltage caused by the switching of the transformer. The method of claim 1, The base station antenna of the PKE system for a vehicle, characterized in that the transformer driver switching elements (20a, 20b) further includes a protection circuit for preventing overvoltage due to the switching of the transformer. The method of claim 1, And a low frequency response detection circuit (50) for detecting a weak signal transmitted from the transponder to the antenna (40) in the transformer (30). The method of claim 7, wherein The low frequency response detection circuit (50) is configured to control each component in the vehicle in response to the response of the transponder from the detected signal.

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