摘要:
Provided are a dry-state detecting method and an electronic device system for a fuel cell, which detect the dry state of an electrolyte film precisely, and a power control method for optimizing the control of a starting time on the basis of the dry state detected. The fuel cell is constituted to include an electrolyte film, and a catalyst electrode and a gas diffusion electrode disposed on the two faces of the electrolyte film. The dry-state detecting method detects the dry state on the basis of a displacement of the electrolyte film in an in-plane direction.
摘要:
In a viewpoint of the invention, a fuel cell system includes a fuel cell configured to generate a electric power by using fuel; a first assisting power source; a protecting circuit connected to the first assisting power source and configured to detect a failure in the first assisting power source; an auxiliary unit configured to supply the fuel to the fuel cell; a control circuit configured to control the fuel cell and the auxiliary unit; a first power converter configured to drive the control circuit by using electric power from the first assisting power source; and a first synthesizing section configured to synthesize a first electric power from the fuel cell and a second electric power from the first assisting power source to supply a synthesized power to a load.
摘要:
A simple oscillator circuit is capable of generating a plurality of frequencies that are completely independent of one another, any one of which frequencies can be freely selected. The oscillator may be used as part of an electronic ringer for a telephone, for example. The oscillator circuit includes a capacitor which is charged from a current source. A discharge constant current circuit discharges the charge from the capacitor. A comparator compares the charge voltage on the capacitor with a first or a second reference voltage. In response to the output of the comparator, a reference voltage switching control circuit supplies the first or second reference voltage to the comparator and controls the turning on and off of the discharge constant current circuit. A control constant current source controls the current from the charge current source for charging the capacitor. The frequency of the output signal from the comparator is controlled by regulating the control constant current source to switch the current capacity of the charge current source.