Magnetic peak current mode control for radiation tolerant active driven synchronous power converters
First Claim
1. A peak current mode control (PCMC) controller for a power converter, the power converter comprising a main transformer having a primary winding and a secondary winding, the primary winding electrically coupleable to an input voltage node and electrically coupled to a main switch, the secondary winding electrically coupleable to an output voltage node and electrically coupled to a synchronous rectifier switch, the PCMC controller comprising:
- a peak current detector circuit having a first input node operatively coupled to a current sensor circuit that, in operation, senses a current of the power converter, a second input node operatively coupled to an error control signal circuit, and an output node that provides a peak current detector output signal usable at least in part to control the operation of the main switch, in operation the peak current detector circuit compares a current sensor signal received from the current sensor circuit to an error control signal received from the error control signal circuit and, responsive to detecting that the current sensor signal exceeds the error control signal, changes the state of the peak current detector output signal;
a magnetic isolator circuit comprising an isolation transformer comprising a primary winding and a secondary winding, the magnetic isolator circuit comprising a first input node operatively coupled to the error control signal circuit, a second input node operatively coupled to a clock circuit to receive a clock signal therefrom, a first output node electrically coupled to the second input node of the peak current detector circuit to provide the error control signal to the peak current detector circuit, and a second output node electrically coupled to the secondary winding of the isolation transformer; and
a synchronous gate drive circuit comprising a first input node operatively coupled to the secondary winding of the main transformer, a second input node operatively coupled to the second output node of the magnetic isolator circuit, and an output node operatively coupled to control the operation of the synchronous rectifier switch.
1 Assignment
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Accused Products
Abstract
Systems and methods for providing peak current mode control (PCMC) for power converters using discrete analog components. A pair of complementary bipolar junction transistors may be used to set a maximum duty cycle for the power converter. PCMC may be achieved using a comparator that compares peak input current to an error feedback signal and terminates a pulse-width modulation (PWM) pulse when the peak input current exceeds the error feedback signal. A magnetic signal transformer may be used to establish a secondary side bias voltage supply, to return the error signal, and to drive an AC-coupled signal for a synchronous gate drive. A synchronous switch may be turned on when the main switch is turned off via an output winding of the flyback transformer and may be turned off by the trailing edge of a clock pulse from the magnetic signal transformer before the main switch is turned on.
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Citations
24 Claims
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1. A peak current mode control (PCMC) controller for a power converter, the power converter comprising a main transformer having a primary winding and a secondary winding, the primary winding electrically coupleable to an input voltage node and electrically coupled to a main switch, the secondary winding electrically coupleable to an output voltage node and electrically coupled to a synchronous rectifier switch, the PCMC controller comprising:
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a peak current detector circuit having a first input node operatively coupled to a current sensor circuit that, in operation, senses a current of the power converter, a second input node operatively coupled to an error control signal circuit, and an output node that provides a peak current detector output signal usable at least in part to control the operation of the main switch, in operation the peak current detector circuit compares a current sensor signal received from the current sensor circuit to an error control signal received from the error control signal circuit and, responsive to detecting that the current sensor signal exceeds the error control signal, changes the state of the peak current detector output signal; a magnetic isolator circuit comprising an isolation transformer comprising a primary winding and a secondary winding, the magnetic isolator circuit comprising a first input node operatively coupled to the error control signal circuit, a second input node operatively coupled to a clock circuit to receive a clock signal therefrom, a first output node electrically coupled to the second input node of the peak current detector circuit to provide the error control signal to the peak current detector circuit, and a second output node electrically coupled to the secondary winding of the isolation transformer; and a synchronous gate drive circuit comprising a first input node operatively coupled to the secondary winding of the main transformer, a second input node operatively coupled to the second output node of the magnetic isolator circuit, and an output node operatively coupled to control the operation of the synchronous rectifier switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power converter, comprising:
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a transformer having a primary winding and a secondary winding, the primary winding electrically coupleable to an input voltage node and the secondary winding electrically coupleable to an output voltage node; a primary circuit electrically coupled to the primary winding, the primary circuit comprising a main switch; a secondary circuit electrically coupled to the secondary winding, the primary circuit comprising a synchronous rectifier switch; and a peak current mode control (PCMC) controller, comprising; a peak current detector circuit having a first input node operatively coupled to a current sensor circuit that, in operation, senses a current of the power converter, a second input node operatively coupled to an error control signal circuit, and an output node that provides a peak current detector output signal usable at least in part to control the operation of the main switch, in operation the peak current detector circuit compares a current sensor signal received from the current sensor circuit to an error control signal received from the error control signal circuit and, responsive to detecting that the current sensor signal exceeds the error control signal, changes the state of the peak current detector output signal; a magnetic isolator circuit comprising an isolation transformer comprising a primary winding and a secondary winding, the magnetic isolator circuit comprising a first input node operatively coupled to the error control signal circuit, a second input node operatively coupled to a clock circuit to receive a clock signal therefrom, a first output node electrically coupled to the second input node of the peak current detector circuit to provide the error control signal to the peak current detector circuit, and a second output node electrically coupled to the secondary winding of the isolation transformer; and a synchronous gate drive circuit comprising a first input node operatively coupled to the secondary winding of the main transformer, a second input node operatively coupled to the second output node of the magnetic isolator circuit, and an output node operatively coupled to control the operation of the synchronous rectifier switch. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A peak current mode control (PCMC) controller for a power converter, the power converter comprising a main transformer having a primary winding and a secondary winding, the primary winding electrically coupleable to an input voltage node and electrically coupled to a main switch, the secondary winding electrically coupleable to an output voltage node and electrically coupled to a synchronous rectifier switch, the PCMC controller comprising:
a magnetic isolator circuit comprising an isolation transformer comprising a primary winding electrically coupled to a primary side circuit and a secondary winding electrically coupled to a secondary side circuit, the magnetic isolator circuit comprising circuitry that, in operation, provides a voltage supply to the secondary side circuit, provides an error control signal from the secondary side circuit to the primary side circuit, and provides an output signal usable by a synchronous gate drive circuit to control the operation of the synchronous rectifier switch.
Specification