SYNCHRONOUS RECTIFICATION DC/DC CONVERTER
First Claim
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1. A controller of a synchronous rectification DC/DC converter, the controller comprising:
- a pulse modulator structured to generate a pulse signal, such that an output signal of the DC/DC converter approaches a target value;
a reverse flow detection circuit structured to, when a detection value of a coil current of the DC/DC converter crosses a threshold for zero crossing, assert a reverse flow detection signal and structured to turn off a synchronous rectification transistor of the DC/DC converter; and
an optimizer structured to control an operation parameter of the reverse flow detection circuit, on the basis of the pulse signal.
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Abstract
A pulse modulator generates a pulse signal, such that an output signal of a DC/DC converter approaches a target value. When a detection value of a coil current of the DC/DC converter crosses a threshold for zero crossing, a reverse flow detection circuit asserts a reverse flow detection signal and turns off a synchronous rectification transistor of the DC/DC converter. An optimizer controls an operation parameter of the reverse flow detection circuit, on the basis of a cycle of the pulse signal.
20 Citations
20 Claims
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1. A controller of a synchronous rectification DC/DC converter, the controller comprising:
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a pulse modulator structured to generate a pulse signal, such that an output signal of the DC/DC converter approaches a target value; a reverse flow detection circuit structured to, when a detection value of a coil current of the DC/DC converter crosses a threshold for zero crossing, assert a reverse flow detection signal and structured to turn off a synchronous rectification transistor of the DC/DC converter; and an optimizer structured to control an operation parameter of the reverse flow detection circuit, on the basis of the pulse signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A synchronous rectification DC/DC converter comprising:
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a pulse modulator structured to generate a pulse signal, such that an output signal of the DC/DC converter approaches a target value; a current detection circuit structured to generate a detection value of a coil current of the DC/DC converter; a reverse flow detection circuit structured to assert a detection signal, when the detection value of the coil current crosses a threshold for zero crossing; a driver which structured to drive a switching transistor and a synchronous rectification transistor of the DC/DC converter, on the basis of the pulse signal, and to turn off the synchronous rectification transistor of the DC/DC converter, when the detection signal is asserted; and an optimizer structured to control an operation parameter of the reverse flow detection circuit, on the basis of the pulse signal.
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19. A control method for a synchronous rectification DC/DC converter, the control method comprising:
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generating a pulse signal, such that an output signal of the DC/DC converter approaches a target value; generating a detection value of a coil current of the DC/DC converter; asserting a detection signal, when the detection value of the coil current crosses a threshold for zero crossing; driving a switching transistor and a synchronous rectification transistor of the DC/DC converter, on the basis of the pulse signal; turning off the synchronous rectification transistor of the DC/DC converter, when the detection signal is asserted; and controlling a response speed when the detection signal is generated, on the basis of the pulse signal. - View Dependent Claims (20)
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Specification