Circuit entering hundred percent duty ratio and control method thereof

A 100% duty cycle, circuit technology, applied in electrical components, generating electrical pulses, pulse generation, etc., can solve problems such as slow speed, complex circuits, and inability to adapt to threshold points.

Pending Publication Date: 2022-03-29
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is based on the problems that the traditional circuit enters a 100% duty cycle, the circuit is complex, the threshold point of entry cannot be self-adapted, and the speed is slow, etc., and proposes a circuit and its control method for entering a 100% duty cycle

Method used

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  • Circuit entering hundred percent duty ratio and control method thereof
  • Circuit entering hundred percent duty ratio and control method thereof

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] The core idea of ​​the present invention is to use the speed difference between each analog quantity and logic signal in the circuit, that is, there is a sequence, and the logic signal processes information at a faster speed, and the high quality of the latch can make the circuit run safely.

[0029] Such as figure 1 As shown, the circuit proposed by the present invention is mainly composed of the following parts, ea amplifier, sum amplifier, on-timer, D flip-flop, hys control logic, driver control logic

[0030] The mechanism of smoothly entering high duty is that the on timer is used to generate the upper tube turn-on signal. When the input voltage is close to the output voltage, the signal generated by the on timer circuit becomes longer and longer. When the signal is reversed, the FB_LOW signal is detected. If the FB_LOW signal is still at high level at t...

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PUM

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Abstract

The invention belongs to the technical field of analog integrated circuits, and particularly relates to a 100% duty ratio entering circuit and a control method thereof. An internal detection adaptive on timer is mainly utilized to generate a signal to be compared with an internal FB detection circuit, if the timer is reversed at the moment, but an output signal of an fb detection circuit is still at a high level, it is affirmed that a 100% duty cycle is entered at the moment, a high duty signal HD is generated, the threshold value of an ea comparator is adjusted by utilizing the signal, the high level maintaining length of an fflow signal is smoothly lengthened, and the high level maintaining length of the high duty signal HD is adjusted. By means of the method, the system can smoothly enter a 100% state, meanwhile, the circuit is in an overall loop, and the stability of the system cannot be damaged.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a circuit with a 100% duty cycle and a control method thereof. Background technique [0002] In the traditional DCDC structure, especially for BUCK, its output voltage and input voltage are processed by internal logic, and there is a duty cycle relationship between them. Generally, we use D to represent the duty cycle. The duty ratio D is a value between 0 and 1, the higher the value, the higher the output voltage for the BUCK system, and the closer it is to the input voltage. However, due to the existence of parasitic inductance and capacitance in the circuit, when the input and output are close, it is easily affected by parasitic devices, and the system is easily unstable at this time, and it is difficult to maintain the output voltage with extremely small ripples. Therefore, in order to avoid circuit instability, the current traditional circuit ...

Claims

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Application Information

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IPC IPC(8): H03K3/017
CPCH03K3/017
Inventor 王宇王佳煜
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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