OPERATING CIRCUIT FOR LEDS
First Claim
1. An operating circuit for at least one LED, which is supplied with direct current voltage or rectified alternating current voltage, and which provides a supply voltage for the at least one LED by a coil (L1) and a first switch (S1) that is clocked by a control/regulation unit (SR), where during the activated state of the first switch S1, energy is temporarily stored in the coil (L1), which is discharged when the first switch (S1) is turned off through a diode (D1) and through at least one LED, wherein a capacitor (C1) is provided, which is arranged in parallel to at least one LED, and which maintains the current through the LED during a demagnetization phase of the coil (L1), a first sensor unit (SE1) is provided, which generates a sensor signal (SES1) which is dependent on the current flowing through the first switch (S1), and/or with a second sensor unit (S2), which detects that the demagnetization of the coil (L1) has been reached and generates a sensor signal (SES2), the sensor signals (SES1, SES2) are supplied to and processed by a control/regulation unit (SR) at a point in time when the first switch (S1) is turned on again, when the coil (L1) is demagnetized and/or the diode (D1) is blocking.
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Accused Products
Abstract
An operating circuit is provided for an LED, which receives a voltage, and which supplies a voltage for the LED via a coil, having a first switch clocked by a control/regulating unit. Power is stored temporarily in the coil when the first switch is activated so that the power is discharged via a diode and via the LED when the first switch is turned off. A capacitor is arranged in parallel to the LED and maintains current through the LED during the demagnetization of the coil. A first switch generates a first sensor signal dependent on the current flowing through the first switch, and/or a second sensor unit, which detects whether demagnetization of the coil unit has occurred and generates a sensor signal. The signals are fed to the control/regulating unit and processed. The control/regulating unit reactivates the first switch when the coil is demagnetized and/or the diode is blocking.
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Citations
14 Claims
- 1. An operating circuit for at least one LED, which is supplied with direct current voltage or rectified alternating current voltage, and which provides a supply voltage for the at least one LED by a coil (L1) and a first switch (S1) that is clocked by a control/regulation unit (SR), where during the activated state of the first switch S1, energy is temporarily stored in the coil (L1), which is discharged when the first switch (S1) is turned off through a diode (D1) and through at least one LED, wherein a capacitor (C1) is provided, which is arranged in parallel to at least one LED, and which maintains the current through the LED during a demagnetization phase of the coil (L1), a first sensor unit (SE1) is provided, which generates a sensor signal (SES1) which is dependent on the current flowing through the first switch (S1), and/or with a second sensor unit (S2), which detects that the demagnetization of the coil (L1) has been reached and generates a sensor signal (SES2), the sensor signals (SES1, SES2) are supplied to and processed by a control/regulation unit (SR) at a point in time when the first switch (S1) is turned on again, when the coil (L1) is demagnetized and/or the diode (D1) is blocking.
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13. A method for operating at least one LED by a switching regulator circuit, which is supplied with direct current voltage or rectified alternating current voltage and which provides a supply voltage for at least one LED by a coil (L1) and a first switch (S1) that is clocked by a control/regulation unit (SR), where during the activated state of the first switch S1, energy is temporarily stored in the coil (L1), which is discharged when the first switch (S1) is turned off through a diode (D1) and through at least one LED, where a capacitor (C1) is provided, which is arranged in parallel to at least one LED, and which maintains the current through the LED during the phase of the demagnetization of the coil (L1), the method comprising:
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providing a first sensor unit (SE1) and/or a second sensor unit (SE2), detecting demagnetization of the coil (L1), turning the first switch (S1) on again, via the control/regulation unit (SR), at a point in time when the coil (L1) is demagnetized and/or the diode (D1) is blocking. - View Dependent Claims (14)
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Specification