Method for the high-frequency heating of dielectric workpieces

A method for heating and joining workpieces with a high-frequency generator that, during a heating interval, supplies a high-frequency output to at least two electrodes disposed on the workpieces, the high-frequency output being controlled with respect to a series of target values, the method comprising the steps of:

• controlling the high-frequency output with reference to the series of target values that are dependent on a first parameter;
• measuring a series of further parameter values during the heating interval;
• comparing the series of further parameter values with a series of predetermined limiting values, wherein the predetermined limiting value is defined as a percentage of a series of standard values;
• calculating a correction signal based on a difference between the series of further parameter values and the series of predetermined limiting values;
• and
• effecting counteracting control of the high-frequency output by supplying the correction signal to a control circuit of the high frequency generator to adjust the first parameter away from the series of target values when the difference exceeds a predetermined value.

A method for heating and joining together of workpieces with a high-frequency generator which, during a heating interval, supplies a high-frequency output to at least two electrodes disposed on the workpieces, the high-frequency output being controlled with respect to a series of target values, the method comprising the steps of:

• controlling the high-frequency output with reference to the series of target values that are dependent on a first parameter;
• measuring a series of further parameter values during the heating interval, wherein the series of further parameter values is measured with reference to a series of internal predetermined limiting values and a series of external predetermined limiting values, wherein said series of internal predetermined limiting values is defined as a percentage, less than 100 percent, of a series of standard values and said series of external predetermined limiting values is defined as a percentage, greater than 100 percent, of the series of standard values;
• and
• effecting counteracting control of the high-frequency output responsive to the series of further parameter values supplied to a control circuit of the high frequency generator when the series of internal predetermined limiting values is exceeded, and wherein the high frequency generator is switched off when the series of external predetermined limiting values is exceeded.

A method for heating and joining together of workpieces with a high-frequency generator which, during a heating interval, supplies a high-frequency output to at least two electrodes disposed on the workpieces, the high-frequency output being controlled with respect to a series of target values, the method comprising the steps of:

• controlling the high-frequency output with reference to the series of target values that are dependent on a first parameter;
• measuring a series of further parameter values during the heating interval;
• and
• effecting counteracting control of the high-frequency output responsive to the series of further parameter values supplied to a control circuit of the high frequency generator by temporarily increasing the output of the high frequency generator.