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A multiple-output DC-DC converter

A DC converter and multi-output technology, applied in the direction of output power conversion devices, instruments, DC power input conversion to DC power output, etc., can solve the problem that DC-DC converters are not suitable for multiple individually regulated output voltages, etc. question

Inactive Publication Date: 2006-01-11
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This prior art DC-DC converter is not suitable for providing multiple individually regulated output voltages

Method used

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  • A multiple-output DC-DC converter
  • A multiple-output DC-DC converter
  • A multiple-output DC-DC converter

Examples

Experimental program
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Embodiment Construction

[0034] Like numbers in various figures refer to like signals or like elements performing similar functions 1 .

[0035] figure 1 A circuit diagram of a prior art single output DC-DC converter with dual duty cycle control is shown. figure 1 The DC-DC converter as the boost converter 1 includes an inductor L arranged in series and a first switch S1 (main switch) arranged between the first input terminal 2 and the second input terminal 3 to receive the input Voltage Vin. A diode D and a second switch S2 (output switch) arranged in parallel are arranged between the junction of the main switch S1 and the inductor L and the first output terminal 4 . The second input 3 and the second output 5 are interconnected. A smoothing capacitor C is provided between the first output terminal 4 and the second output terminal 5 . A load 12 is connected between the first output terminal 4 and the second output terminal 5 . The comparator 9 compares the output voltage Vout at the first output ...

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PUM

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Abstract

The multiple-output DC-DC converter comprises an inductor (L) and a main switch (S0) which periodically couples a DC-input voltage (Vin) to the inductor (L). Each one of a multitude of loads (L1, L2 ,L3) is coupled to the inductor (L) via one of a multitude of output switches (S1, S2, S3). One of a multitude of output voltages (V1, V2, V3) is present across each of the loads (L1, L2 ,L3). A controller (CO) controls the main switch (S0) and the output switches (S1, S2, S3) in sequences (SE) of cycles (CY). Each one of the cycles (CY1, CY2, CY3) contains an on-phase of the main switch (S0) followed by an on-phase of one of the multitude of output switches (S1, S2, S3). The cycles (CY1, CY2, CY3) have either a predetermined first (minimum) duty cycle (D1) or a second (maximum) duty cycle (D2) which is larger than the first duty cycle (D1). The controller (CO) comprises a multitude of comparators (10, 11, 12) which each compare one of the multitude of output voltages (V1, V2, V3) with an associated one of a multitude of reference voltages (VR1, VR2, VR3). The controller (CO) further checks whether the number of the multitude of output voltages (V1, V2, V3) which have a value above their associated reference voltage (VR1, VR2, VR3) is larger than, smaller than, or equal to the number of the multitude of output voltages (V1, V2, V3) which have a value below their associated reference voltage (VR1, VR2, VR3). The duty cycles are selected such that the number of cycles (CY1, CY2, CY3) with the minimal duty cycle (D1) are larger than, smaller than, or equal to the number of cycles with the maximum duty cycle (D2), respectively.

Description

technical field [0001] The present invention relates to a multiple output DC-DC converter, an electronic device comprising such a multiple output DC-DC converter and a method of controlling a multiple output DC-DC converter. Background technique [0002] Patent WO 02 / 058220-A1 discloses a single output DC-DC converter in which a main switch periodically couples a DC input voltage to an inductor for storing energy in the inductor during the conduction period of the main switch. During the off-period of the primary switch, the secondary switch couples the load to the inductor to transfer energy from the inductor to the load. The subsequent on and off periods of the main switch are referred to as switching periods or cycles. The ratio of the on time to the cycle duration is called the duty cycle. [0003] The output voltage of the DC-DC converter is regulated by comparing the output voltage across the load with a reference level. If the output voltage is higher than the refe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M3/335
CPCH02M3/33561H02M3/155
Inventor F·J·斯鲁伊斯
Owner NXP BV