Method and apparatus for controlling heat energy of a bonding transformer
First Claim
1. Apparatus for controlling the amount of heat energy supplied to a workpiece including coil windings by a bonding transformer having primary and secondary windings to heat said coil windings to a predetermined temperature level for fusing said coil windings into an integral mass, comprising means for connecting said workpiece in series to the secondary windings of said bonding transformer, means for continuously and directly monitoring the current level delivered to said workpiece to provide a signal representative of the current in said workpiece, means for presetting the output voltage of said bonding transformer to a substantially constant value while said current level is being monitored, means for providing a reference signal level corresponding to a current level in said workpiece at which said coil windings will manifest a desired temperature, comparator means for receiving said signal from said monitoring means and for comparing said signal to said reference signal which corresponds to said desired temperature level, and means responsive to an output of said comparator means indicative that said signal from said monitoring means is no longer greater than said reference signal level for controlling said bonding transformer to terminate a further application of current to said workpiece.
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Abstract
The present invention provides a method and apparatus for controlling the amount of heat energy supplied by a bonding transformer to coil windings to heat the windings to a predetermined temperature level for fusing the windings into an integral mass. This is accomplished by continuously monitoring the current level in the secondary windings of the bonding transformer and comparing the signal produced with a signal preset in a comparator, which preset signal corresponds to the heat energy required by the coil windings to heat them to the predetermined temperature level. The comparator then operates to deactivate the bonding transformer when the monitored signal corresponds to the predetermined temperature level desired in the coil windings.
20 Citations
10 Claims
- 1. Apparatus for controlling the amount of heat energy supplied to a workpiece including coil windings by a bonding transformer having primary and secondary windings to heat said coil windings to a predetermined temperature level for fusing said coil windings into an integral mass, comprising means for connecting said workpiece in series to the secondary windings of said bonding transformer, means for continuously and directly monitoring the current level delivered to said workpiece to provide a signal representative of the current in said workpiece, means for presetting the output voltage of said bonding transformer to a substantially constant value while said current level is being monitored, means for providing a reference signal level corresponding to a current level in said workpiece at which said coil windings will manifest a desired temperature, comparator means for receiving said signal from said monitoring means and for comparing said signal to said reference signal which corresponds to said desired temperature level, and means responsive to an output of said comparator means indicative that said signal from said monitoring means is no longer greater than said reference signal level for controlling said bonding transformer to terminate a further application of current to said workpiece.
- 9. A method for controlling the amount of heat energy supplied to a workpiece including coil windings by a bonding transformer having primary and secondary windings to heat said coil windings to a predetermined temperature level for fusing said coil windings into an integral mass, comprising the steps of connecting said workpiece in series to the secondary windings of said bonding transformer, continuously and directly monitoring the current level delivered to said workpiece to provide a signal representative of the current in said workpiece being heated, presetting the output voltage of said bonding transformer to a substantially constant value while said current level is being monitored, said output voltage corresponding to the voltage for a nominal coil winding, providing a reference signal level corresponding to a current level in said workpiece at which said coil windings will manifest a desired temperature, supplying said monitored signal to a comparator and comparing said signal to said reference signal which corresponds to said desired temperature level, and terminating current supplied to said workpiece by said bonding transformer when said monitored signal no longer exceeds said reference signal level representing said temperature level desired in said coil windings.
Specification