| CPC H03K 17/691 (2013.01) [H02M 3/07 (2013.01); H02M 3/33523 (2013.01); H03K 19/0175 (2013.01)] | 20 Claims |
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1. A signal transmission device comprising:
an isolated signal transmission circuit configured to transmit a pulse signal from a primary circuit system via a first isolating element to a secondary circuit system; and
an isolated power supply control circuit to serve as a controlling agent of an isolation-type power supply that generates a second supply voltage for the secondary circuit system from a first supply voltage for the primary circuit system, the isolated power supply control circuit being configured to transmit an output feedback signal of the isolation-type power supply from the secondary circuit system via a second isolating element to the primary circuit system,
wherein the isolated signal transmission circuit includes:
first and second transformers that correspond to the first isolating element;
a pulse transmitter configured to
pulse-drive a first transmission pulse signal fed to a primary winding of the first transformer when notifying that an input pulse signal is at a first logic level, and
pulse-drive a second transmission pulse signal fed to a primary winding of the second transformer when notifying that the input pulse signal is at a second logic level;
a pulse receiver configured to
switch a received pulse signal to a first logic level when, as a result of the first transmission pulse signal being pulse-driven, the pulse receiver detects an induced pulse in a first received pulse signal that appears in a secondary winding of the first transformer, and
switch the received pulse signal to a second logic level when, as a result of the second transmission pulse signal being pulse-driven, the pulse receiver detects an induced pulse in a second received pulse signal that appears in a secondary winding of the second transformer; and
a driver configured to generate an output pulse signal in accordance with the received pulse signal.
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