One cycle control PFC boost converter integrated circuit with inrush current limiting, fan motor speed control and housekeeping power supply controller

A power factor corrected boost converter circuit comprising:

• a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus;
• an inductor having first and second terminals connected in one leg of the dc bus, a first terminal of the inductor coupled to the output of said rectifier;
• an integrated circuit comprising a control circuit for controlling a switch, the integrated circuit comprising a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal coupled to an output of the converter circuit, and a second control input terminal coupled to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch;
• a boost rectifier diode having a first terminal, the first terminal of the diode coupled to the second terminal of the inductor, the diode having a second terminal;
• and
• a storage capacitor connected to the second terminal of the diode;
• wherein the control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal, the integrator receiving as an input a signal provided on said first control input terminal;
• further comprising a fan motor speed control circuit, the fan motor speed control circuit regulating the fan motor speed as a function of the current sensed at said second control input terminal.

A power factor corrected boost converter circuit comprising:

• a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus;
• an inductor having first and second terminals connected in one leg of the dc bus, a first terminal of the inductor coupled to the output of said rectifier;
• an integrated circuit comprising a control circuit for controlling a switch, the integrated circuit comprising a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal coupled to an output of the converter circuit, and a second control input terminal coupled to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch;
• a boost rectifier diode having a first terminal, the first terminal of the diode coupled to the second terminal of the inductor, the diode having a second terminal;
• and
• a storage capacitor connected to the second terminal of the diode;
• wherein the control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal, the integrator receiving as an input a signal provided on said first control input terminal;
• further comprising a housekeeping power supply controller, said housekeeping power supply controller being controlled by a feedback voltage comprising the voltage level on said power terminal.

An integrated circuit for a power factor corrected boost converter circuit, the boost converter circuit including a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus;

• an inductor having first and second terminals connected in one leg of the dc bus, a first terminal of the inductor coupled to the output of said rectifier;
• a boost rectifier diode having a first terminal coupled to the second terminal of the inductor and having a second terminal;
• and a storage capacitor connected to the second terminal of the diode;
• the integrated circuit comprising:
• a control circuit for controlling a switch, the integrated circuit comprising a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal for coupling to an output of the converter circuit, and a second control input terminal for coupling to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch;
• wherein the control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal, the integrator receiving as an input a signal provided on said first control input terminal;
• further comprising an inrush current limiting circuit for limiting the current through the inductor to a value below a predetermined level.

An integrated circuit for a power factor corrected boost converter circuit, the boost converter circuit including a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus;

• an inductor having first and second terminals connected in one leg of the dc bus, a first terminal of the inductor coupled to the output of said rectifier;
• a boost rectifier diode having a first terminal coupled to the second terminal of the inductor and having a second terminal;
• and a storage capacitor connected to the second terminal of the diode;
• the integrated circuit comprising:
• a control circuit for controlling a switch, the integrated circuit comprising a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal for coupling to an output of the converter circuit, and a second control input terminal for coupling to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch;
• wherein the control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal, the integrator receiving as an input a signal provided on said first control input terminal;
• further comprising a fan motor speed control circuit, the fan motor speed control circuit regulating the fan motor speed as a function of the current sensed at said second control input terminal.

An integrated circuit for a power factor corrected boost converter circuit, the boost converter circuit including a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus;

• an inductor having first and second terminals connected in one leg of the dc bus, a first terminal of the inductor coupled to the output of said rectifier;
• a boost rectifier diode having a first terminal coupled to the second terminal of the inductor and having a second terminal;
• and a storage capacitor connected to the second terminal of the diode;
• the integrated circuit comprising:
• a control circuit for controlling a switch, the integrated circuit comprising a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal for coupling to an output of the converter circuit, and a second control input terminal for coupling to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch;
• wherein the control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal, the integrator receiving as an input a signal provided on said first control input terminal;
• further comprising a housekeeping power supply controller;
• said housekeeping power supply controller being controlled by a feedback voltage comprising the voltage level on said power terminal.