A circuit and power chip for reducing loss under light load
A power chip, light-load technology, applied in electrical components, output power conversion devices, etc., can solve the problems of low efficiency of the power system and large loss of the drive control part, and achieve the effect of reducing loss and improving efficiency
Active Publication Date: 2021-09-21
SHANGHAI XINLONG SEMICON TECH CO LTD
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Problems solved by technology
[0005] The technical problem solved by the invention is that under light load conditions, the loss of the internal drive control part of the power supply chip is relatively large, resulting in low efficiency of the power supply system
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[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some of the embodiments of the present disclosure, not all of them. Based on the described embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative effort fall within the protection scope of the present disclosure.
[0039] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importan...
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The invention discloses a circuit and a power chip for reducing loss under light load, including a leading edge blanking unit, a current detection unit that outputs the fifth output voltage, a voltage detection unit that outputs the sixth output voltage, and an inductor that outputs the seventh output voltage A current mode judging unit, a logic unit, and a frequency switching unit, the logic unit receives the fifth output voltage, the sixth output voltage, and the seventh output voltage, and outputs a logic voltage through logic conversion, and the frequency switching unit receives the logic voltage. Oscillator frequency switching: when the fifth output voltage, the sixth output voltage and the seventh output voltage are all at low level, the logic voltage is at high level, so that the oscillator in the power chip is in a low frequency state. The invention reduces the operating current of the power chip by reducing the frequency of the internal oscillator of the power chip at light load, reduces the loss of the driving control part, and improves the efficiency of the power system at light load.
Description
technical field [0001] The invention relates to the field of power chips, in particular to a circuit and a power chip that reduce loss under light load. Background technique [0002] The loss of the power supply system includes the loss of the power tube inside the power chip, the loss of the logic circuit and the drive control part inside the power chip. Since the gate-source parasitic capacitance of the power MOS tube is relatively large, in order to quickly turn on the power MOS tube and reduce the loss of the power MOS tube , when the power MOS tube is turned on, the drive control part of the circuit needs to output an instantaneous large current to charge the parasitic capacitor, and this peak current will cause a large loss. [0003] At light load, the loss of the power system is mainly caused by the loss of the internal logic circuit and drive control part of the power chip. For the power chip in PWM mode (pulse width modulation mode), the frequency of the oscillator...
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IPC IPC(8): H02M1/00
CPCH02M1/00
Inventor 王琦桀李瑞平刘彬
Owner SHANGHAI XINLONG SEMICON TECH CO LTD