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A slope compensation circuit

A slope compensation and circuit technology, applied in the layout of amplifier protection circuit, electrical components, adjusting electrical variables, etc., can solve problems such as overcompensation, and achieve the effect of reducing offset, improving DC gain, and avoiding overcompensation.

Active Publication Date: 2022-05-13
BEIJING MXTRONICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional slope compensation circuit uses a fixed slope compensation scheme, that is, the same amount of compensation slope is used for the entire duty cycle conversion range, which is easy to cause overcompensation.

Method used

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  • A slope compensation circuit
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Embodiment Construction

[0020] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0021] figure 1 is a schematic diagram of a novel slope compensation circuit provided by an embodiment of the present invention. Such as figure 1 As shown,...

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Abstract

The invention discloses a novel slope compensation circuit, comprising: a slope signal generation circuit and an upper tube current sampling circuit; wherein, the slope signal generation circuit is connected to the upper tube current sampling circuit; the slope signal generation circuit adopts The source follower structure ensures the linear relationship between the slope current and the input voltage. The output current mirror mirror point potential isolation structure is adopted to avoid the interference of the mirror point potential during switch conversion; the operational amplifier circuit of the upper tube current sampling circuit adopts BIP transistors Improved current detection accuracy. The invention realizes slope compensation by sampling the current flowing through the upper tube and superimposing it on the slope signal, improves the stability of the system, and reduces the system response time. The slope generating circuit adopts a source follower structure to simplify the circuit structure and improve the accuracy of the slope signal. The input pair of the current sampling circuit of the upper tube adopts a triode with a larger area, which reduces the offset voltage and improves the accuracy of current compensation.

Description

technical field [0001] The invention belongs to the technical field of slope compensation circuits, in particular to a novel slope compensation circuit. Background technique [0002] The slope compensation circuit is an important module in analog circuits and analog-digital hybrid circuits, and is often used in current-mode switching power supply chips. When the duty cycle of the control signal is lower than 50%, the disturbance of the inductor current can be suppressed through the internal feedback regulation, so that the current can maintain a stable state. However, when the duty cycle is greater than 50%, this disturbance will continue to increase with the increase of the number of cycles, resulting in low-frequency oscillation or unstable state. By compensating the rise and fall slopes of the inductor current, the disturbance current tends to zero after several cycles. [0003] The traditional slope compensation circuit adopts a fixed slope compensation scheme, that is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H03F1/52
CPCH02M3/156H03F1/52
Inventor 张景超王秀芝宋奎鑫李阳莫艳图康磊柏晓鹤张志伟阳启明
Owner BEIJING MXTRONICS CORP
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