Temperature controlling circuit for a semiconductor light-emitting device

A temperature control circuit for controlling an operating temperature of a semiconductor device, comprising:

• a thermoelectric controller for mounting said semiconductor device, said thermoelectric controller having two terminals and heating up or cooling down said semiconductor device by flowing a current between said two terminals of said thermoelectric controller;
• a temperature-sensing device for monitoring a temperature of said semiconductor device;
• and
• a thermoelectric controller driver circuit including,
• a current driver for controlling a direction of said current flowing between said two terminals of said thermoelectric device,
• a voltage controller for controlling a DC voltage provided to said current driver, and
• a temperature controller, by comparing said temperature of said semiconductor device with a target temperature, for outputting a current direction control signal to said current driver to set said direction of said current flowing in said thermoelectric controller,
• wherein said DC voltage provided to said current driver varies depending on said current flowing in said thermoelectric controller.