| 主权项 |
1. A retrofit lamp comprising at least one series circuit comprising a multiplicity of light emitting diodes comprising a circuit arrangement, the circuit arrangement comprising:
a first connection with a first connection terminal and a second connection terminal; a second connection with a third connection terminal and a fourth connection terminal; a rectifier, whose input is coupled to the first connection and whose output comprises a first rectifier output connection and a second rectifier output connection; wherein the at least one series circuit comprising a multiplicity of light emitting diodes is coupled between the first rectifier output connection and the second rectifier output connection; wherein a breakdown apparatus is coupled between the third connection terminal and the fourth connection terminal, said breakdown apparatus having the following properties:
up to a first predeterminable threshold value of the voltage drop across said breakdown apparatus during operation, said breakdown apparatus is nonconducting;if the first predeterminable threshold value is exceeded, said breakdown apparatus becomes conducting;said breakdown apparatus remains conducting as long as current is supplied to it which is above a second predeterminable threshold value;as soon as the current falls below the second predeterminable threshold value, said breakdown apparatus becomes nonconducting again; andin the conducting state, said breakdown apparatus has a forward voltage which is below a third predeterminable threshold value. |
