Patent ID: 9006928
Filing Date: 2015-04-14
Classification: H02J

Abstract:
1. A current and voltage detection circuit comprising: a voltage input terminal to which a direct current voltage from a power supply is applied; a voltage comparison circuit that determines which of the voltage applied to the voltage input terminal and a predetermined voltage is larger; a switching element connected in series to a current-voltage conversion unit, between a positive electrode terminal of the power supply and a reference potential point of the circuit; and a control circuit that generates a control signal of the switching element in response to an output of the voltage comparison circuit, wherein the current and voltage detection circuit is configured to turn the switching element to an ON-state and determine the voltage being applied to the voltage input terminal, by the voltage comparison circuit, when either of a voltage supply capability and current supply capability of the power supply is low; and to turn the switching element to an OFF-state by the control signal outputted from the control circuit and determine the voltage being applied to the voltage input terminal, by the voltage comparison circuit, when the voltage comparison circuit determines that the voltage applied to the voltage input terminal is higher than the predetermined voltage.