Adaptive sectional driving DC-DC converter

A DC-DC, segmented drive technology, applied in the direction of converting DC power input to DC power output, instrumentation, and adjusting electrical variables, etc., can solve problems such as limitations, power tube switching frequency changes, etc., to improve efficiency and reduce switching losses , The effect of reducing the driving loss

Inactive Publication Date: 2012-11-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these two modes have an obvious disadvantage: the switching frequency of the power tube changes with t

Method used

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  • Adaptive sectional driving DC-DC converter
  • Adaptive sectional driving DC-DC converter
  • Adaptive sectional driving DC-DC converter

Examples

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Embodiment

[0033] In this example, the structure of the self-adaptive segmented drive DC-DC converter is as follows: image 3 As shown, the number of power transistors in the switching conversion circuit is 13 PMOS power transistors and 13 NMOS power transistors, and the gate signals gp and gn output by the drive unit have 13 states respectively, which can control the opening and closing of each power transistor respectively. That is, the case of m=13. The internal structure of the feedback control unit includes an error amplifier circuit, a PWM comparator, a dead zone control circuit, and a mode detection circuit. The error amplification circuit includes an error amplifier EA and a frequency compensation circuit. The input terminals of the error amplifier EA are respectively connected to the output voltage Vout and the reference voltage Vref of the energy conversion unit, and its output signal is used as an input of the PWM comparator after passing through the frequency compensation cir...

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Abstract

The invention relates to an integrated circuit technology, in particular to the application of a load adaptive sectional driving circuit in a buck voltage stabilizing circuit (also called BUCK circuit). The invention discloses an adaptive sectional driving direct current to direct current (DC-DC) converter. According to the adaptive sectional driving DC-DC converter, m p-channel metal oxide semiconductor (PMOS) power tubes and N-channel metal oxide semiconductor (NMOS) power tubes which are connected in parallel, form a switching circuit to drive different amount of power tubes to switch according to different load current magnitudes; less power tubes are driven under a light load condition, equivalently, the power of the power tubes is lowered, so that the driving loss and switching loss are reduced under the light load condition. Furthermore, the driving way of the power tubes is changed; and the switch-on amount of the power tubes is changed by detecting the change of load current, so that the sum of the conduction loss and driving loss of the power tubes is minimized; and therefore, the efficiency of the DC-DC converter is increased, in particular the efficiency under light load. The adaptive sectional driving DC-DC converter is particularly suitable for the buck voltage stabilizing circuit.

Description

technical field [0001] The present invention relates to integrated circuit technology, in particular to a load self-adaptive segmented driving circuit, and its application in a step-down voltage stabilizing circuit (also called a BUCK circuit). Background technique [0002] The integrated step-down voltage converter (BUCK) circuit structure is as figure 1 As shown, it includes an energy conversion unit 1 , a drive unit 2 and a feedback control unit 3 . The energy conversion unit 1 usually includes a switch conversion circuit composed of two power transistors, a PMOS (P-channel metal oxide semiconductor) power transistor and an NMOS (N-channel metal oxide semiconductor) power transistor, figure 1 are marked as PMOS and NMOS respectively. Under the control of the output signal of the drive unit 2, the PMOS power transistor and the NMOS power transistor work in the switching state, and convert the input high-voltage direct current Vdd into a square wave signal output, and fin...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 罗萍罗明莫易昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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