Circuit and lighting system for dimming an illuminant

An integrated circuit that is configured for dimming an illuminant in accordance with digital dimming values that form desired values by digital control, the circuit comprising:

• a digital to analog converter to convert the digital dimming values to analog dimming values,
• an amplifier to provide a gain to form amplified analog actual values,
• a comparator to compare the analog dimming values to the amplified analog actual values, and determine an analog control deviation therefrom, and
• an analog to digital converter to convert the analog control deviation to a digital control deviation to provide the digital control.

A circuit arrangement for dimming an illuminant in accordance with digital dimming values which form desired values by digital control, comprising:

• an amplifier to provide a gain to form amplified analog actual values,
• a comparator in which analog dimming values and the amplified analog actual values corresponding to a brightness of the illuminant are fed, and that determines an analog control deviation by comparison, and the comparator operates in analog fashion to determine the analog control deviation,
• wherein connected upstream of the comparator is a digital to analog converter that converts the digital dimming values into the analog dimming values, and
• connected downstream of the comparator is an analog to digital converter that converts the analog control deviation into a digital control deviation that is then fed to a digital controller to produce an analog manipulated variable for controlling the illuminant.

An operating device for illuminants comprising a circuit arrangement for dimming an illuminant in accordance with digital desired values by digital control, the circuit arrangement comprising;

• an amplifier to provide a gain to form amplified analog actual values,
• a comparator in which analog dimming values and the amplified analog actual values corresponding to a brightness of the illuminant are fed, and that determines an analog control deviation by comparison, and the comparator operates in analog fashion and determines an analog control deviation,
• a digital to analog converter connected upstream of the comparator that converts the digital dimming values into the analog dimming values, and
• an analog to digital converter connected downstream of the comparator that converts the analog control deviation into the digital control deviation that is fed to a digital controller to produce an analog manipulated variable for controlling the illuminant.

A lighting system that includes a plurality of operating devices with connected illuminants, including at least one operating device having a circuit arrangement for dimming an illuminant in accordance with digital desired values by digital control, the circuit arrangement comprising:

• an amplifier to provide a gain to form amplified analog actual values,
• a comparator in which analog dimming values and the amplified analog actual values corresponding to a brightness of the illuminant are fed, the comparator determining an analog control deviation by comparison, and the comparator operates in analog fashion and determines an analog control deviation,
• a digital to analog converter connected upstream of the comparator that converts the digital dimming values into the analog dimming values, and
• an analog to digital converter connected downstream of the comparator that converts the analog control deviation into the digital control deviation that is fed to a digital controller to produce an analog manipulated variable for controlling the illuminant.