Patent number 8599029 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "The present invention relates to an electrical circuit identification means, especially to electrical circuit identification means by which the position of a socket at a remote end that is corresponding to each main power switch and connected to the same circuit in a power control panel can be found out under the condition that the circuit is conducted.
"Refer to U.S. Pat. No. 3,924,179 'Method for certifying dead cables or conductors by determining current pulse polarity', a DC pulse transmitter 20 is connected through test lead 21 'A' to conductor 23 under test while clamp-on jaws 51 of DC pulse receiver 50 are clamped around the conductor 23 under test to receive signals from the DC pulse transmitter 20 for certifying a dead conductor or cable.
"In the above method and apparatus, a dead insulated electrical conductor among a plurality of conductors is certified by determining the polarity of a net DC pulse in the conductor. Only a dead conductor or cable can be detected. As to conductive circuit, the prior art is unable to determine relationship between main power switches and power sockets.
"Refer to U.S. Pat. No. 5497094 'Electrical circuit identification means', a transmitter is plugged into the receptacle of the line to be traced. Getting power from this line, the transmitter imparts to this line, a spike by virtue of the sudden application of an uncharged capacitor of the transmitter as a momentary 'short-circuit' load to this line. The pulse thus produced is detectable by a receiver. By a blinking indicator light or a sounding buzzer, a line or lines carrying the load current is located.
"The receiver uses a pickup coil to receive the pulse. However, if there are some other lines, mobile phones, computers or other electronics in use near the line/line under test, the electrical signals generated cause interference problem. Thus the receiver has errors in identifying the signals received and the detection accuracy is reduced.
"Refer to U.S. Pat. No. 6,163,144 'Electrical circuit tracing apparatus using modulated tracing signal', an electrical circuit tracing apparatus includes a transmitter being connected to the circuit to be identified such as a power socket and a receiver placed in proximity to the circuit such as power control panel to find out the elements of the circuit such as main power switches. The transmitter has an electrical current signal generator including a low frequency oscillator and a high frequency gated oscillator modulated by the low frequency oscillator and a current modulator. Thus a high frequency current signal is induced in the circuit that is modulated at the low frequency. The receiver has a circuit including an inductive pick-up that is tuned to the high frequency so as to induce in the puck-up a current of the high frequency when the coil is excited by the magnetic field of the circuit. The receiver further has a signal strength indicator such as a line of LED lights is used to signal users and the signal strength varies in accordance with the magnitude of the current in the pick-up.
"By low frequency signals as carrier, high frequency signals are transmitted and received by the transmitter and the receiver mentioned above. Thus the manufacturing cost is high.
"Thus there is room for improvement and there is a need to provide an electrical circuit identification means that overcomes the above shortcomings and has high accuracy."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "Therefore it is a primary object of the present invention to provide an electrical circuit identification means in which a signal generator is with simple circuit design without high frequency/low frequency modulations so that the manufacturing cost is reduced.
"It is another object of the present invention to provide an electrical circuit identification means in which a signal receiver converts analog signals received into digital signals for reducing interference of noises. Then time and signals of the converted digital signals are cross checked by a firmware in a microcontroller so that the signal identification ability is increased.
"In order to achieve the above objects, an electrical circuit identification means of the present invention includes a signal generator and a signal receiver. The signal generator is directly connected to an AC power socket and is used to block one half input sine waves of the AC power source and leave only positive half cycle of sine waves. After an interval, an off-and-on signal is generated. Thus a waveform having the positive half cycle of sine waves and the off-and-on waves is obtained. Compare the waveform having the positive half cycle of sine waves and the off-and-on waves with the sine waves of general AC power, there is an obvious difference.
"The signal receiver is set at an area arranged with a plurality of main power switches in a power control panel or set nearby cables connected to a power socket under test. The signal receiver receives the waveform having the positive half cycle of sine waves and the off-and-on waves from the signal generator. After two stage signal amplification, analog signals are converted into digital signals and are sent to a microcontroller connected thereof. The signals are cross checked by a firmware of an identification system in the microcontroller. At last, the identification accuracy depends on the position of a light lit up in an indicator light module that includes a line of indicator lights arranged into a row vertically. In use, only one of the indicator lights is lit up and the position of the indicator light lit up represents the accuracy of the detection."
URL and more information on this patent, see: Chien, Shih-Hsiang. Electrical Circuit Identification Means. U.S. Patent Number 8599029, filed
Keywords for this news article include: Electronics, Microcontroller,
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