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Novel slope compensation circuit

A technology of slope compensation and circuit, which is applied in the direction of amplifier protection circuit layout, electrical components, and adjustment of electrical variables, and can solve problems such as overcompensation

Active Publication Date: 2021-03-23
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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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 by 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. The novel slope compensation circuit comprises a slope signal generation circuit and an upper tube current sampling circuit. The slope signal generation circuit is connected with the upper tube current sampling circuit. According to the slope signal generation circuit, a source follower structure is adopted to ensure that slope current and input voltage form a linear relationship; and an output current mirror image point potential isolation structure is adopted, so that a mirror point potential is prevented from being interfered during switch conversion. An operational amplifier circuit of the upper tube current sampling circuit adopts a BIP transistor, so that the current detection precision is improved. According to the novel slope compensation circuit of the invention, the current flowing through a sampling upper tube is superposed to a slope signal to realize slope compensation, so that the stability of a system is improved and the response time of the system is reduced; the slope generation circuit adopts the source follower structure, so that the circuit structure is simplified, and the accuracy of the slope signal is improved; and triodes with larger areas are adopted as input geminate transistors of the upper transistor current sampling circuit, so that the offset voltage is reduced, and the current compensation precision is improved.

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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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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