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A controller

A controller and control signal technology, applied in instruments, control/regulating systems, regulating electrical variables, etc., can solve problems such as the integral control loop is not closed, the voltage drift of the integral capacitor, etc.

Inactive Publication Date: 2007-08-29
NXP BV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It was also disclosed that this prior art solution has the disadvantage that the actual value to which the inductor current is limited depends on the slope compensation
However, the disadvantage of this solution is that the integral control loop is not closed during limiting action, so the voltage of the integral capacitor will drift

Method used

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Embodiment Construction

[0050] Figure 1 shows a block diagram of a prior art current mode controlled DC / DC converter. Especially in telecommunication systems where handhelds manage transmit power economically to increase battery life, the supply voltage of the transmit output amplifier should be controlled so as to be optimally adapted to the actual transmit power. A current-mode DC / DC converter (also known as a power converter or converter) supplying the supply voltage should be able to regulate its output voltage quickly and accurately. Hereinafter, a current-mode DC / DC converter is also called a power converter or even a converter. In this application, in a handheld device, the load LO represents the circuit of the handheld device, such as an output amplifier.

[0051]The power converter comprises a current mode controller 1 (also referred to as controller) which provides a control signal ICO which depends on the difference between the converter output voltage Vo and a reference voltage Vr. The ...

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Abstract

A controller (1) comprises a comparator (10) which compares an input signal (Vo) with a reference signal (Vr) to obtain an error signal (ER). An integrator (11) applies an integrating action on the error signal (ER) to obtain a control signal (ICO). The integrator (11) allows influencing the integrating action. A copy circuit (81) supplies a copy control signal (ICOC) being proportional to the control signal (ICO). A determination circuit (85) determines whether the copy control signal (ICOC) reaches a limit value (IMIN, IMAX). An influencing circuit (83) influences the integrating action to limit the control signal (ICO) when the copy control signal (ICOC) reaches the limit value (IMIN, IMAX).

Description

technical field [0001] The present invention relates to a controller, a current mode control DC / DC converter including the controller, a device including the current mode control DC / DC converter, and a control method. Background technique [0002] In a current mode controlled direct current / direct current (DC / DC) converter, a controllable switch is connected to the inductor to generate a periodically varying inductor current through the inductor. The outer voltage regulation loop includes a current mode controller that subtracts the output voltage of the converter from a reference voltage to provide an error signal that is processed to obtain a control signal. This control signal can be used as a set level for the peak current in the inductor. Processing typically includes a proportional-integral (PI) or proportional-integral-derivative (PID) controller that receives an error signal and provides a control signal. Therefore, the process is also often referred to as a contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/575H02M3/156H02M3/335
CPCH02M3/33507H02M3/156G05F1/10
Inventor 皮埃特·G·布兰肯
Owner NXP BV
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