Control arrangement for an electric heating appliance
First Claim
1. A control arrangement for an electrical heating appliance having a glass cooking plate and plurality of separately operable electrical heating units disposed below the glass cooking plate for heating respective areas of the glass cooking plate, the control arrangement comprising:
- a control unit having a control subunit for each of the electrical heating units, each of the control subunits having at least one operating unit;
each of the operating units having;
an electrically conductive sensor surface positioned below the glass cooking plate;
a pulse generator supplying pulses through an impedance; and
, a comparator having a first input coupled to said sensor and to said impedance and having a second input coupled to a reference, the comparator generating an output signal which changes when the sensor surface is engaged; and
,the sensor surface of each operating element being surrounded by a shielding conductor, all of the shielding conductors being coupled to a common shielding potential.
4 Assignments
0 Petitions
Accused Products
Abstract
An electronic control arrangement for an electrical heating appliance with several separately heatable electrical loads, particularly cooking points or hotplates, contains an electronic master switch, which has its own power supply. The master switch is followed by a control unit having for each electrical load in each case one control subunit. For each hotplate the control unit has a temperature sensor, which responds if the control unit becomes too hot at this point.
45 Citations
24 Claims
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1. A control arrangement for an electrical heating appliance having a glass cooking plate and plurality of separately operable electrical heating units disposed below the glass cooking plate for heating respective areas of the glass cooking plate, the control arrangement comprising:
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a control unit having a control subunit for each of the electrical heating units, each of the control subunits having at least one operating unit; each of the operating units having;
an electrically conductive sensor surface positioned below the glass cooking plate;
a pulse generator supplying pulses through an impedance; and
, a comparator having a first input coupled to said sensor and to said impedance and having a second input coupled to a reference, the comparator generating an output signal which changes when the sensor surface is engaged; and
,the sensor surface of each operating element being surrounded by a shielding conductor, all of the shielding conductors being coupled to a common shielding potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A control arrangement for an electrical heating appliance having a glass cooking plate and plurality of separately operable electrical heating units disposed below the glass cooking plate for heating respective areas of the glass cooking plate, the control arrangement comprising:
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a control unit having a control subunit for each of the electrical heating units, each of the control subunits having at least one operating unit; each of the operating units having an electrically conductive sensor surface positioned below the glass cooking plate and a circuit generating an output signal which changes when the sensor surface is engaged; and
,the sensor surface of each operating element being surrounded by a shielding conductor, all of the shielding conductors being coupled to a common shielding potential.
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Specification