A control circuit and a method for an energy based pulse skipping mode in a DC/DC converter
A control circuit and pulse skipping technology, applied in the direction of adjusting electrical variables, control/regulation systems, converting DC power input to DC power output, etc.
Inactive Publication Date: 2016-07-13
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology
[0008] The problem associated with the prior art solutions is that the DCM entering the SMPS during the PSM of operation
Method used
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[0025] In the following, different aspects are described in more detail with reference to certain embodiments and figures. For purposes of explanation and not limitation, specific details are given, such as specific scenarios and techniques, in order to provide a thorough understanding of the various embodiments. However, other embodiments exist that depart from these specific details.
[0026] The basic idea of the invention is to use a charge / energy calculator that calculates the value of the energy in each pulse. This energy value is stored in an accumulator. The output current flowing to the connectable load is subtracted from the energy value stored in the accumulator. When the energy value stored in the accumulator is below zero, the mode controller enables the switches of the power train to charge the output capacitor with a new pulse from the inductor and add the corresponding energy value to the accumulator. Figure 9 The resulting form factor for one cycle is il...
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The present invention relates to a control circuit for a switched mode power supply (101), and to a related method for controlling the switching elements (201, 202) in a power train of a switched mode power supply. The control circuit comprises a mode controller (107) configured to monitor the output current (lout) to determine whether the output current exceeds a current threshold. The mode controller is configured to control the switching controller (105) to generate the switch control signals such that, when the current exceeds the current threshold, the power train operates in a continuous conduction mode, and upon determining that the output current has fallen to or below the current threshold the operation of the power train is changed from the continuous conduction mode to a pulse skipping mode such that the pulse skipping mode is entered from the continuous conduction mode, wherein the pulse skipping mode involves determining the amount of energy stored in a secondary circuit (204) of the power train. The secondary circuit is operatively connected to the output terminal and when the amount of energy stored in the secondary circuit has fallen to or below an energy threshold the mode controller instructs the switching controller to enable energy transfer from the primary circuit to the secondary circuit by means of the switch control signals. When the amount of energy stored in the secondary circuit exceeds the energy threshold, the energy transfer from the primary circuit to the secondary circuit is disabled by means of the switch control signals.
Description
technical field [0001] The present invention relates to control circuits and methods for switch mode power supplies. More particularly, the present invention relates to a control circuit and method for a switched mode power supply operable to control a pulse skipping mode. Background technique [0002] A switched-mode power supply (SMPS) is a well-known type of power converter that plays a vital role in supplying power to modern electronic circuits. Several SMPS improvements have envisioned ways to increase switching efficiency during high load conditions. An example of such an improvement is the synchronous rectification concept used in modern SMPSs. Synchronous rectification causes SMPS to achieve high power efficiency at higher current levels. But synchronous rectification suffers from increased switching activity in the powertrain of the SMPS, which results in reduced efficiency at light load conditions compared to standard diode rectification traditionally used in co...
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IPC IPC(8): H02M3/335H02M1/00
CPCH02M3/33576Y02B70/10H02M1/0035H02M3/33507
Inventor M·卡尔森O·珀森
Owner TELEFON AB LM ERICSSON (PUBL)