Systems and methods for high precision and/or low loss regulation of output currents of power conversion systems
First Claim
1. An error amplifier for a reference signal and an input signal associated with a current of a power converter, the error amplifier comprising:
- a first operational amplifier including a first input terminal, a second input terminal and a first output terminal, the first input terminal being configured to receive a reference signal, the first output terminal configured to output a first amplified signal to a first transistor terminal of a first transistor, the first transistor further including a second transistor terminal and a third transistor terminal, and the second input terminal being coupled to the third transistor terminal;
a second operational amplifier including a third input terminal, a fourth input terminal and a second output terminal, the third input terminal being configured to receive an input signal associated with a first current flowing through a primary winding of a power converter, the second output terminal configured to output a second amplified signal to a fourth transistor terminal of a second transistor, the second transistor further including a fifth transistor terminal and a sixth transistor terminal, and the fourth input terminal being coupled to the sixth transistor terminal;
a current mirror including a first mirror terminal and a second mirror terminal, the first mirror terminal being coupled to the second transistor terminal;
a switch including a first switch terminal and a second switch terminal, the first switch terminal being coupled to the second mirror terminal, the second switch terminal being coupled to the fifth transistor terminal;
a first resistor including a first resistor terminal and a second resistor terminal, the first resistor being associated with a first resistance, the first resistor terminal being coupled to the second input terminal; and
a second resistor including a third resistor terminal and a fourth resistor terminal, the second resistor being associated with a second resistance, the third resistor terminal being coupled to the fourth input terminal;
wherein;
the first resistance is larger than the second resistance in magnitude; and
the error amplifier is configured to output a first output signal based at least in part on the reference signal and the input signal.
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Accused Products
Abstract
Systems and methods are provided for signal processing. An example error amplifier for processing a reference signal and an input signal associated with a current of a power conversion system includes a first operational amplifier, a second operational amplifier, a first transistor, a second transistor, a current mirror component, a switch, a first resistor and a second resistor. The first operational amplifier includes a first input terminal, a second input terminal and a first output terminal, the first input terminal being configured to receive a reference signal. The first transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal, the first transistor terminal being configured to receive a first amplified signal from the first output terminal, the third transistor terminal being coupled to the second input terminal.
157 Citations
14 Claims
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1. An error amplifier for a reference signal and an input signal associated with a current of a power converter, the error amplifier comprising:
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a first operational amplifier including a first input terminal, a second input terminal and a first output terminal, the first input terminal being configured to receive a reference signal, the first output terminal configured to output a first amplified signal to a first transistor terminal of a first transistor, the first transistor further including a second transistor terminal and a third transistor terminal, and the second input terminal being coupled to the third transistor terminal; a second operational amplifier including a third input terminal, a fourth input terminal and a second output terminal, the third input terminal being configured to receive an input signal associated with a first current flowing through a primary winding of a power converter, the second output terminal configured to output a second amplified signal to a fourth transistor terminal of a second transistor, the second transistor further including a fifth transistor terminal and a sixth transistor terminal, and the fourth input terminal being coupled to the sixth transistor terminal; a current mirror including a first mirror terminal and a second mirror terminal, the first mirror terminal being coupled to the second transistor terminal; a switch including a first switch terminal and a second switch terminal, the first switch terminal being coupled to the second mirror terminal, the second switch terminal being coupled to the fifth transistor terminal; a first resistor including a first resistor terminal and a second resistor terminal, the first resistor being associated with a first resistance, the first resistor terminal being coupled to the second input terminal; and a second resistor including a third resistor terminal and a fourth resistor terminal, the second resistor being associated with a second resistance, the third resistor terminal being coupled to the fourth input terminal; wherein; the first resistance is larger than the second resistance in magnitude; and the error amplifier is configured to output a first output signal based at least in part on the reference signal and the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification