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Sawtooth wave generating device in chip of electric current mode PWM DC-DC converter

A technology of current converter and generating device, which is applied in the direction of converting DC power input into DC power output, output power conversion device, and adjusting electric variable, which can solve the problems that cannot be obtained directly, cannot be obtained directly, or need to be added additionally. Achieve the effect of reducing chip generation and installation costs and improving work stability

Inactive Publication Date: 2007-11-28
QX MICRO DEVICES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, as shown in Figure 1, in the step-up DC-DC converter chip 1, VOUT can be directly obtained, and VIN is connected to the chip 1 through an inductor, so it cannot be directly obtained or it needs to be obtained directly by adding additional pins of the chip 1. ; As shown in Figure 2, in the step-down DC-DC converter chip 2, VIN can be directly obtained, and VOUT is drawn from the chip 2 through the inductance, so it cannot be directly obtained or it needs to be directly obtained by adding the lead pin of the chip 2

Method used

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  • Sawtooth wave generating device in chip of electric current mode PWM DC-DC converter
  • Sawtooth wave generating device in chip of electric current mode PWM DC-DC converter
  • Sawtooth wave generating device in chip of electric current mode PWM DC-DC converter

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Embodiment Construction

[0044] The core contribution of the present invention to the DC-DC converter is that the sawtooth wave generator for compensation only uses VIN or VOUT that can be obtained directly. First, its working principle is explained according to Table 2:

[0045] See Table 2, as long as the value of D and one of VIN and VOUT can be measured, the converter chip can directly obtain a voltage, so the other value of VIN and VOUT that cannot be directly obtained can be obtained through the table The relationship in the second is obtained, so that all the feedback signals needed for adaptive compensation can be obtained without adding pins.

[0046] Next, the principle and specific implementation circuit of the sawtooth wave generator used for adaptive compensation inside the boost converter (1) and the buck converter (2) are described respectively:

[0047] (1) Boost converter: VOUT is usually used to power the converter chip, while VIN is not connected to the converter chip. Therefore, V...

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Abstract

This invention relates to a saw-tooth wave-generating device integrated in PWM DC-DC converter chips characterizing in including a low-pass filter with its serial input ends connecting and controlling the CLK of a DC-DC conversion switch circuit in the chips, a voltage- current converter, a controlled switch, a condenser and electric earth. The chips of this device are supplied by VIN or VOUT and get D*VIN or D*VOUT by the low-pass filter in it so as to get the feedback information necessary for the device based on the relation of D-VIN and VOUT to output compensated saw-tooth waves. It's not necessary for the device to increase chip lead pins to get another kind of VOUT or VIN, which are not got directly.

Description

technical field [0001] The invention relates to switching power supply technology, in particular to a generation method and device for adaptively compensating sawtooth waves in a current mode PWM DC-DC converter. Background technique [0002] Pulse Width Modulation Pulse Width Modulation, referred to as PWM, mainly uses PWM technology in switching DC-DC converters, and its application is very extensive. PWM control is divided into two types of current mode and voltage mode. The current mode has the advantages of good stability and simple compensation, and has been widely used in PWM power supplies. [0003] This type of step-up and step-down DC-DC converter, as shown in Figure 1 and Figure 2, when the duty cycle D of the CLK signal controlling the switching circuit is >50%, the current-mode DC-DC converter may not be stable Work, the sawtooth wave generator is used to generate a compensating sawtooth wave so that the system can work stably. In order for the system to w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
Inventor 黄朝刚
Owner QX MICRO DEVICES
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