Control circuit of DC-DC converter and its control method

A control circuit, DC-DC technology, applied in the direction of analog conversion, code conversion, control/regulation system, etc.
CN1925292AInactive Publication Date: 2007-03-07SOCIONEXT INC
3 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SOCIONEXT INC
Publication Date
2007-03-07
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

To present a control circuit of a DC-DC converter to be incorporated in a logic circuit, having a digital error amplifier capable of controlling the gain depending on an input voltage and an output voltage, without requiring a resistance or a capacitor of high precision used in a feedback circuit or the like. A SigmaDelta AD converter type error amplifier 10 includes an arithmetic unit 20 , an integrating unit 21 , a 1-bit quantizing unit 22 , a D / A converter 23 , and a first counter 24 . The arithmetic unit 20 outputs a differential signal of an output voltage Vout and an average output voltage AV. The integrating unit 21 outputs an integral signal by integrating the differential signal. The 1-bit quantizing unit 22 outputs a 1-bit digital signal by quantizing the integral signal. The D / A converter 23 converts from digital to analog depending on a 1-bit digital signal. A digital PWM circuit 11 determines the on-duty of the main switching element of the DC-DC converter depending on the pulse density of the D / A converter 23.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the control of a DC-DC converter, in particular, to a control circuit of a DC-DC converter which can be easily constituted in a logic circuit and a control method thereof. Background technique

[0002] In a control circuit of a synchronous rectification switching type DC-DC converter with an analog error amplifier, the analog error amplifier has a resistor or capacitor as a feedback circuit. In the case of fluctuations in the input voltage of the DC-DC converter or variable control of the output voltage of the DC-DC converter, it is required that the error amplifier does not oscillate. In order to set the gain so that the phase of the feedback circuit has a margin, when designing a DC-DC converter, the design of the phase compensation of the feedback circuit must take into account the relationship between the input and output voltages. That is, the gain must be controlled statically.

[0003] Other related art is disc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More