GB2226906A

GB2226906A - Remote control for arming and disarming an alarm system

Info

Publication number: GB2226906A
Application number: GB8900134A
Authority: GB
Inventors: Shih-Ming Hwang
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-01-05
Filing date: 1989-01-05
Publication date: 1990-07-11
Also published as: NL8901089A; GB8900134D0

Abstract

The remote control includes a transmitter in which a predetermined code is stored in an encoder 101. An oscillator-driver circuit 102 is connected to the encoder to produce an electromagnetic wave which is modulated in accordance with the stored code. The modulated wave is transmitted through an antenna 103. A cooperating receiver has an antenna to receive the transmitted electromagnetic wave. The receiver includes an amplifier, detector, regulator and decoder to recognise the code transmitted. In response to recognition of a predetermined code a control signal for a driver circuit of, for example, a burglar alarm, is generated. <IMAGE>

Description

REMOTE CONTROL This invention relates to coding inductance coupling remote control systems. The present invention is to provide a coding inductance coupling remote control system and, more particularly, a controller which uses a code to control a magnetic field so as to form arming/ disarming features to a burglar alarm.

Regular car alarm controllers include a short-range contact control type and a remote control type. Regular short-range contact type controllers make use of a code to control a magnet and to drive the magnet to contact a reed switch at a predetermined position so as to open or close car doors and to simultaneously arm/disarm a burglar alarm. The structure of a magnet contact type controller provides the advantages of (1) not interferring with other burglar alarms and (2) being free from interference by other alarms. However, it still has drawbacks as described hereunder.

1. It is workable only within a very short range.

2. If there is any accumulation of snow or the device is iced up, the controller will lose its function.

3. Because the switch plate is attached to the windshield on the inner side, and the magnet is arranged on the outer side of said windshield, it is possible for the magnet to become close to the switch plate and cause the magnet to rub against and scratch the glass of the windshield.

4. Because the decoder is comprised of a magnet, the magnetic force of the magnet tends to be reduced gradually, thereby causing contact failure. Further, the replacement of the magnet decoder is not simple.

A regular burglar alarm remote controller may either make use of infrared rays or radio frequency transmission to control car doors and burglar alarms. Although this type of controller may not have the drawbacks in the above-described magnet contact type controllers, it still can not avoid interference. While in remote control operation to open the matching burglar alarm, other similar alarms which are within affective range may be opened, causing the matching burglar alarm to be locked; or while to close the matching burglar alarm, other similar alarms which are within effective range may be closed,causing the matching burglar alarm to be disarmed.

The present invention is to provide a coding inductant coupling remote control system and, more particularly, a remote controller which makes use of an electromagnetic wave to control the arming or disarmed- of a burglar alarm.

The remote controller is operated by setting a code for a transmitter so that the code can be modulated by an oscillator circuit, and sent to a driver circuit to drive a transformer, thereby producing an electromagnetic wave to be further transmitted through an antenna. The transmitted signal is further received by a receiver through an antenna. The received signal is further amplified, detected, rectified and finally decoded by a decoder and further sent to a driver circuit to drive a burglar alarm to arm or disarm correspondingly. Through coding inductant type electromagnetic wave control, the present controller - in addition to the provision of the advantages as provided in regular burglar alarm RF remote controllers and magnet contact type burglar alarm controllers -- is free from the interference of RF wave and prevents the drawbacks which exist in regular magnet controllers.

The above-described and other objectives, features and advantages of the present invention will be more apparent from the following description in accordance with the annexed drawings.

Embodiment of the invention is described by way of the following examples with reference to the drawings, in which: Figure 1 is a block diagram of the present invention, illustrating the process of transmitting an electromagnetic wave; Figure 2 is a circuit diagram of the transmitter; Figure 3 is a block diagram of the present invention, illustrating the process of receiving an electromagnetic wave; and Figure 4 is a circuit diagram of the receiver.

Referring to Figure 1, an encoder (101) is set with a preferred code. By means of the oscillation through an oscillator-driver circuit (102), the code signal from the encoder (101) is sent to a transformer for further producing an electromagnetic wave. The electromagnetic wave thus produced is further transmitted through an antenna (103).

Referring to Figure 2, the code signal from the encoder (101) is driven by Q101 at R103. Said oscillator-driver circuit (102) is comprised of R103, C102, Q101, R104, C103, and C104, which turns on T101 to produce an electromagnetic wave for further transmission through an antenna ANT, whereby SW101 is to control the supply of power source.

Referring to Figure 3, the electromagnetic wave received by an antenna ANT (201) is amplified by an amplifying circuit (202) and detected by a detector (203).

The detected signal is further rectified by a regulated circuit (204) and decoded by a decoder circuit (205).

The code signal decoded by said decoder circuit (205) is further sent to a driver circuit (206) to control a burglar alarm to arm or disarm.

Referring to Figure 4, when an electromagnetic wave signal is received by said antenna ANT (201), it is amplified by an amplifying circuit comprised of Q201, Q202, C205, R201, R202, R204, R203, C204, R206, R205, R207, R208, C206 and C207, via C203. The amplified signal is detected by a detector comprised of D201 and D202, and further restified by a rectifying circuit IC201. The block (205) is a decoder which is variably arranged to match with the encoder of the transmitter. When a code signal decoded by said decoder is in conformance with the signal transmitted by said encoder, the output of said block (205) becomes Hi, which further turns on Q203 to let the collector of Q203 control the arming or disarmed of a burglar alarm.

According to the present invention, LED201 is arranged for status indication.

In general, a coding inductance coupling remote control system constructed according to the present invention is characterized by its emission of an electromagnetic wave to control a burglar alarm within a fixed range of about one meter, which provides numerous advantages superior to conventional magnetic contact type controllers and regular RF or infrared remote controllers. It will be understood by those skilled in the art that numerous modifications and improvements may be made to the preferred embodiment of the invention disclosed herein without departing from the spirit and scope hereof.

Claims

1. Coding inductance coupling remote control system, including: - a transmitter system comprised of encoder, oscillator driver circuit, and transmitting antenna, said encoder being set with a code to drive said oscillator driver circuit to produce an oscillating signal so as to further drive a transformer to produce an electromagnetic wave for further emission through a transmitting antenna;; - a receiver system comprised of amplifying circuit, detector, rectifier circuit, decoder, driver circuit and receiving antenna, so that said receiving antenna receives an electromagnetic wave signal transmitted from said transmitter system for further amplification process through said amplifier, the signal amplified by said amplifier is further detected by said detector and rectified by said regulator and further sent through said decoder to said driver circuit so as to further drive the matching burglar alarm into an alert status or to release the matching burglar alarm from an alert status.

2. A remote control system comprising a transmitter and a receiver, the transmitter comprising means for generating an electromagnetic wave modulated in accordance with a predetermined code, the receiver comprising means for receiving a modulated wave transmitted by the transmitter and demodulating it to recover the code, and means for producing a control signal in response to recognition of a predetermined code.

3. A remote control system substantially as herein described with reference to the accompanying drawings.