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Slope compensation circuit

A slope compensation and slope voltage technology, applied in electrical components, adjusting electrical variables, instruments, etc., can solve problems such as difficulty and increase circuit area, and achieve the effect of saving area

Inactive Publication Date: 2017-08-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

In the way of current superposition, since the CS terminal of current sampling and Vslope (slope voltage compensation signal) need to be converted into current, the circuit area increases and the Islope (slope current compensation signal) converted from Vslope needs to start from zero. difficulty

Method used

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] Figure 4 It is a functional block diagram of the slope compensation circuit of the present invention superimposing the slope voltage at the current sampling signal. As shown in the figure, the current sampling signal entering from the CS port will be superimposed with a value of (I slope *R1) After the slope compensation signal, it is compared with the error amplifier signal Ve to generate a PWM square wave control signal, and finally a PWM signal is generated after passing through an SR latch whose S terminal is connected to the clock signal.

[0017] Figure 5 It is a slope voltage generating circuit, a bias current mirror I1 charges the capacitor C2, and the slope remains basically unchanged due to the small current and large capacitance. When the period begins, the clock signal CLK outputs a narrow square wave, which makes the NMOS transistor MN3 open,...

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Abstract

The invention belongs to the technical field of an integrated circuit, and specifically relates to a slope compensation circuit. Compared with slope compensation circuits in a voltage superposition mode and in a current superposition mode, the invention adopts the slope compensation circuit in a hybrid current and voltage superposition mode. I<slope> can be started similarly from zero by an operational amplifier unit gain connection method on the slope voltage; meanwhile, influence from V<slope> output impedance of OSC can be avoided; and requirement of an additional voltage current conversion circuit is avoided by virtue of the voltage superposition mode on CS, so that the area is reduced.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a slope compensation circuit. Background technique [0002] According to the position where the compensation signal is superimposed, the slope compensation circuit can be divided into superposition with the sampling signal and superposition with the output of the error amplifier. Since the slope signal is superimposed at the current sampling signal (such as figure 1 ) is relatively simple to implement, so it is more commonly used. However, the method of superimposing the compensation signal at the current sampling point is commonly used in the way of voltage superposition (such as figure 2 ) and the way of current superposition (such as image 3 ). The method of voltage superposition, because the two voltage sources are not ideal voltage sources and the oscillator (OSC) will have output impedance when generating the slope voltage, which will make the t...

Claims

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/156H02M3/1566
Inventor 方健冯磊张岱宗陈智昕刘振国王科俊方舟林巨征张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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