Method and control circuitry for improved-performance switch-mode converters
First Claim
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1. An active power factor correction power converter system comprising:
- an analog control circuitry to control an input current of said system;
a digital control circuitry to control an output voltage of said system;
a current sampling device in the path of said input current to indicate an instantaneous value proportional to said input current being an input current indication wherein said digital control circuitry is adapted to produce an analog signal responsive to variations in said output voltage, and wherein said analog control circuitry is responsive to said analog signal.
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Abstract
A system and method for supplying power to a load and for controlling the power factor presented to the power line. Output voltage is controlled by a digital, outer, control loop, and inner, analog, control loop causes the input current to be substantially proportional to the input voltage at any particular point in the power line cycle. Thus, the system presents a load to the power line that appears to be purely resistive. The use of an analog multiplier is not required, nor is sampling of input voltage. Limiting of inrush current provides for brown-out protection and soft-start.
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Citations
21 Claims
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1. An active power factor correction power converter system comprising:
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an analog control circuitry to control an input current of said system;
a digital control circuitry to control an output voltage of said system;
a current sampling device in the path of said input current to indicate an instantaneous value proportional to said input current being an input current indication wherein said digital control circuitry is adapted to produce an analog signal responsive to variations in said output voltage, and wherein said analog control circuitry is responsive to said analog signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling an input current and an output voltage in an active power factor correction power converter system comprising:
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controlling an input current of said system by an analog control circuitry;
controlling an output voltage of said system by a digital control circuitry;
wherein said digital control circuitry is adapted to produce an analog signal responsive to variations in said output voltage, and wherein said analog control circuitry is responsive to said analog signal. - View Dependent Claims (13, 14, 15, 17, 18)
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16. The method of 15 further comprising:
receiving a signal proportional to an instantaneous value proportional to a rectified input voltage of said system.
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19. An active power factor correction power converter system comprising:
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an analog control circuitry to control an input current of said system;
a digital control circuitry to control an output voltage of said system;
a current sampling device in the ground path of said input current to indicate an average of an instantaneous value proportional to said input current being an input current indication;
a first voltage sampling branch to indicate an instantaneous value of said output voltage being an output voltage indication;
a comparator unit responsive to a signal proportional to said input current indication and to a ramp-type signal driven by a controllable current source;
a controllable current source to control the rise rate of said ramp-type signal to responsive to said output voltage indication; and
a second voltage sampling branch to indicate an instantaneous value of a rectified input voltage of said system being an input voltage indication, wherein said digital control circuitry is adapted to produce an analog signal responsive to variations in said output voltage, wherein said analog control circuitry is responsive to said analog signal wherein said digital control circuitry further comprises a digital controller comprising logic unit, a digitally controlled analog output, an analog-to-digital converter and an input/output unit.
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20. A method of controlling an input current and an output voltage in an active power factor correction power converter system comprising:
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controlling an input current of said system by an analog control circuitry;
controlling an output voltage of said system by a digital control circuitry, said digital control circuitry is adapted to produce an analog signal responsive to variations in said output voltage, receiving a signal proportional to an average of said input current being an input current indication;
receiving a signal proportional to an instantaneous value of said output voltage being an output voltage indication comparing said signal proportional to said input current indication to a ramp-type signal;
switching a current controllable shunt switch on whenever said signal proportional to said input current indication is bigger than said ramp-type signal and off when it is smaller than said ramp-type signal;
controlling a rise rate of said ramp-type signal responsive to a deviation of said output voltage indication from a predetermined value; and
controlling a maximum value of said input current by a controllable switching device in response to a signal from said digital control circuitry.
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21. A power converter system comprising:
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a rectifying circuitry to rectify an AC power to DC power;
an analog control circuitry to control a current drawn from said rectifying circuitry;
a digital control circuitry to control an output voltage of said system;
a current sampling device in the ground path of said input current to indicate an average of an instantaneous value proportional to said input current being an input current indication;
a first voltage sampling branch to indicate an instantaneous value of said output voltage being an output voltage indication;
a comparator unit responsive to a signal proportional to said input current indication and to a ramp-type signal driven by a controllable current source;
a controllable current source to control the rise rate of said ramp-type signal to responsive to said output voltage indication; and
a second voltage sampling branch to indicate an instantaneous value of a rectified input voltage of said system being an input voltage indication, wherein said digital control circuitry is adapted to produce an analog signal responsive to variations in said output voltage, wherein said analog control circuitry is responsive to said analog signal, and wherein said digital control circuitry further comprises a digital controller comprising logic unit, a digitally controlled analog output, an analog-to-digital converter and an input/output unit.
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Specification