Signal transmission circuit
First Claim
1. A signal transmission circuit comprising a transmission apparatus and a reception apparatus which are insulated from each other and between which a signal indicative of predetermined information is transmitted via an insulation element,wherein the transmission apparatus includes a first transmission unit transmitting a first signal indicative of first information based on the number of pulses consecutively outputted with a predetermined period and each having a first waveform with a duty cycle of less than 100% with respect to the period and a second transmission unit transmitting a second signal indicative of second information based on a pulse having a longer wavelength than the first waveform,wherein the first transmission unit transmitting the first signal to the reception apparatus and the second transmission unit transmitting the second signal to the reception apparatus, via the insulation element common to the first transmission unit and the second transmission unit, andwherein the second transmission unit transmits the second signal in synchrony with the pulse having the first waveform, and transmits the second signal indicative of the second information using a pulse having a wavelength which is longer than the first waveform and which is shorter than a period during which the pulse having the first waveform is consecutively outputted.
1 Assignment
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Accused Products
Abstract
In a signal transmission circuit including a drive circuit and a control apparatus which are insulated from each other and between which a signal indicative of predetermined information is transmitted via a magnetic coupler, the drive circuit includes a temperature information transmission unit transmitting a first signal indicative of temperature information based on the number of pulses consecutively output with a predetermined period and each having a first waveform with a duty cycle of less than 100% with respect to the period and an abnormality information transmission unit transmitting a second signal indicative of abnormality information based on a pulse having a longer wavelength than the first waveform. The temperature information transmission unit transmits the first signal to the control apparatus and the abnormality information transmission unit transmits the second signal to the control apparatus, via the magnetic coupler common to two information transmission units.
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Citations
9 Claims
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1. A signal transmission circuit comprising a transmission apparatus and a reception apparatus which are insulated from each other and between which a signal indicative of predetermined information is transmitted via an insulation element,
wherein the transmission apparatus includes a first transmission unit transmitting a first signal indicative of first information based on the number of pulses consecutively outputted with a predetermined period and each having a first waveform with a duty cycle of less than 100% with respect to the period and a second transmission unit transmitting a second signal indicative of second information based on a pulse having a longer wavelength than the first waveform, wherein the first transmission unit transmitting the first signal to the reception apparatus and the second transmission unit transmitting the second signal to the reception apparatus, via the insulation element common to the first transmission unit and the second transmission unit, and wherein the second transmission unit transmits the second signal in synchrony with the pulse having the first waveform, and transmits the second signal indicative of the second information using a pulse having a wavelength which is longer than the first waveform and which is shorter than a period during which the pulse having the first waveform is consecutively outputted.
Specification