US 9,810,731 B2
Load drive apparatus
Yuzo Higuchi, Komaki (JP); and Tomonori Uemura, Komaki (JP)
Assigned to NGK SPARK PLUG CO., LTD., Nagoya (JP)
Filed by NGK SPARK PLUG CO., LTD., Nagoya-shi, Aichi (JP)
Filed on Dec. 2, 2015, as Appl. No. 14/956,558.
Claims priority of application No. 2014-244986 (JP), filed on Dec. 3, 2014.
Prior Publication US 2016/0161542 A1, Jun. 9, 2016
Int. Cl. G01R 31/02 (2006.01); H05B 3/02 (2006.01); H05B 1/02 (2006.01)
CPC G01R 31/025 (2013.01) [H05B 1/0227 (2013.01); H05B 3/02 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A load drive apparatus, comprising:
an application voltage controller for applying a pulse voltage to an electrical load to drive and control the electrical load with the pulse voltage alternately assuming a high voltage and ground voltage;
a current source;
a current source controller that provides an anomaly judgment current from the current source to the electrical load when the pulse voltage assumes the ground voltage; and
an anomaly detector that receives an electrical characteristic of the electrical load when the anomaly judgment current is supplied to the electrical load, and determines whether the electrical load is in any of a plurality of anomalous states, the plurality of anomalous states including at least a deteriorated state of the electrical load and one or more wiring anomalous states of the electrical load.