Patent ID: 6137271
Filing Date: 2000-10-24
Classification: H02H,H02J

Abstract:
An automatic polarity exchange circuit with current detection feedback capabilities, comprising:an automatic polarity exchange switch assembly including a positive polarity switch and a reverse polarity switch;a forward polarity detector connected in parallel with a reverse polarity detector, said forward polarity detector and reverse polarity detector being arranged to respectively drive the positive polarity switch and the reverse polarity switch pursuant to an outcome of polarity detection performed on said positive polarity switch and said reverse polarity switch by the forward polarity detector and the reverse polarity detector; anda time delay circuit connected in series with said automatic polarity exchange switch assembly and arranged, together with a division switching circuit controlled by a load current detection circuit and connected in parallel with the time delay circuit, to prevent a hypersensitivity effect resulting from control operation, said division switching circuit being arranged to conduct when a working current is detected by the load current detection circuit as a result of a correct linkage of polarities on the power side and load side yielding an output,wherein said divider switching circuit operates as a replacement for the time delay circuit so that the automatic polarity exchange switch assembly will continue operation while the time delay circuit is reset to a standby state, andwherein when a load breaks open or a load current scales down, the automatic polarity exchange switch assembly is cut off to cut off power to the load and the automatic polarity exchange circuit resets itself.