Control system for switching element

Claim 2

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the original value of said integrator being supplied by a second integrator which receives, at its input, said control signal, and further means for resetting said second integrator to zero at each pass through zero of the said function.

Claim 3

Control device according to claim 1, characterized in that the input of said second integrator is the sum of the control signal and the output of said rectifier means.

Claim 4

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the original value of the said integrator being supplied by a second integrator which receives, at its input, the sum of the control signal and a voltage which is representative of the said function and further means for resetting said second integrator to zero at each pass through zero of the said function.

Claim 5

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the original value of the said integrator being supplied by a second integrator which receives, at its input, the sum of the control signal and a voltage which is representative of the said function and further means for resetting said second integrator to zero at each pass through zero of the said function.

Claim 6

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectIfying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, said function of the supply voltage being in a sinusoidal form, characterized in that the input of said integrator is supplied by a peak detector comprising a resistor and a capacitor fed by a voltage which is representative of the said function.

Claim 7

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectIfying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, said function of the supply voltage being in a sinusoidal form, characterized in that the input of said integrator is supplied by a peak detector comprising a resistor and a capacitor fed by a voltage which is representative of the said function.

Claim 8

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the input of said integrator being supplied by a peak detector comprising a resistor and a capacitor fed by the output of said rectifier means.

Claim 9

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the input of said integrator being supplied by a peak detector comprising a resistor and a capacitor fed by the output of said rectifier means.

Claim 10

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the input of said integrator being supplied by a peak detector circuit comprising a resistor and a capacitor connected to the output of said rectifier means and raised to the square of squaring means.

Claim 11

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the input of said integrator being supplied by a peak detector circuit comprising a resistor and a capacitor connected to the output of said rectifier means and raised to the square of squaring means.

Claim 12

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the input of said integrator being supplied by a second integrator which receives, at its input the sum of the control signal and of a voltage at the output of said rectifier means and raised to the square by squaring means and further means for resetting said second integrator to zero at each pass through zero of the said periodic supply voltage.

Claim 13

Device for controlling by impulses, responsive to a control signal, a switching element operating by an on-off process and connected to a current supply having a periodic voltage, comprising rectifier means for rectifying said supply voltage, an integrator connected to receive said rectified supply voltage for providing the instantaneous value of the integral of a function of that supply voltage, a comparator connected to receive at one input said instantaneous value from the output of said integrator and at the other input said control signal, and applies to said switching element, according to the comparison of those two magnitudes, a switching order for opening or closing the switching element, and means for resetting said integrator, at each pass through zero of the periodic supply voltage, to an original value, other than zero, provided for compensating variations in the periodic voltage supply, the input of said integrator being supplied by a second integrator which receives, at its input the sum of the control signal and of a voltage at the output of said rectifier means and raised to the square by squaring means and further means for resetting said second integrator to zero at each pass through zero of the said periodic supply voltage.