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Smooth transition of power-supply controller from first mode (pulse-frequency-modulation mode) to second mode (pulse-width-modulation mode)

A technology of power supply and pulse wave, applied in the direction of output power conversion device, conversion equipment without intermediate conversion to AC, data processing power supply, etc., which can solve the problem of sacrificing efficiency of boost converter 10

Active Publication Date: 2015-03-18
INTERSIL INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, for a particular load, such a hysteresis band greater than required may cause the boost converter 10 to remain at a lower level due to a load level within the greater than required hysteresis band. efficiency mode at the expense of efficiency

Method used

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  • Smooth transition of power-supply controller from first mode (pulse-frequency-modulation mode) to second mode (pulse-width-modulation mode)
  • Smooth transition of power-supply controller from first mode (pulse-frequency-modulation mode) to second mode (pulse-width-modulation mode)
  • Smooth transition of power-supply controller from first mode (pulse-frequency-modulation mode) to second mode (pulse-width-modulation mode)

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Embodiment Construction

[0278] refer to Figure 5-7 , according to an embodiment a boost converter and technique for alleviating at least the first problem described above is described.

[0279] Figure 5 is a diagram of a boost converter 70 configured according to an embodiment to balance at least one of its parts (eg, a control loop) so that after transitioning from a PFM mode to a discontinuous PWM mode ,Compared to figure 1 The boost converter 10, V out is the momentary amplitude change that is subjected to little or no transition, or at least a reduced transition.

[0280] Figure 6 is an inductor current I during a PFM mode just before transitioning to a discontinuous PWM mode according to an embodiment Inductor (t) 72 versus time, and an inductor current I during a discontinuous PWM mode just after transitioning from the PFM mode Inductor (t) 74 graph versus time.

[0281] and Figure 7 is the Figure 6 The graph then adds a virtual discontinuous PWM inductor current I Inductor (t) 7...

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Abstract

In an embodiment, a power-supply controller includes switching circuitry and an adjuster circuit. The switching circuitry is configured to cause a charging current to flow until the charging current has a predetermined relationship to a threshold, and to cause a discharging current to flow to an output node that carries an output voltage after the charging current. And the adjuster circuit is configured to adjust the threshold such that a ripple voltage superimposed on the output voltage has an approximately constant magnitude. For example, a power supply may include such a power-supply controller to maintain the magnitude of the output ripple voltage within a particular range during a pulse-frequency-modulation (PFM) mode despite variations in one or more parameters such as input voltage, output voltage, filter capacitance, phase inductance, and charging-current-sense impedance, from their respective nominal values.

Description

[0001] priority claim [0002] This application claims priority to U.S. Provisional Patent Application No. 61 / 922,259, filed December 31, 2013, and U.S. Provisional Patent Application No. 61 / 874,351, filed September 5, 2013; The entirety is incorporated herein by reference. technical field [0003] The present application relates generally to electronic circuits, and an embodiment disclosed in the present application particularly relates to a device configured to change a current pulse of a length during a pulse frequency modulated (PFM) mode of operation. Or a part of it maintains the controller of the power supply within a specific range. Background technique [0004] figure 1 is a circuit diagram of a power supply, here a boost converter (sometimes referred to as a boost regulator) 10, and a load 12 receiving power from the boost converter. The boost converter 10 converts an input signal (here an input voltage V in ) becomes a regulated output signal (here a regulated...

Claims

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Application Information

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IPC IPC(8): H02M3/07H02M1/08H02M1/00
CPCH02M3/157G06F1/26H02M2001/0032G09G3/3696H02M2001/0025H02M1/14H02M3/156H02M3/1588H02M1/0025H02M1/0032Y02B70/10
Inventor 尼可拉斯·亚曲柏德
Owner INTERSIL INC
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