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Power supply with tickle pulse injection

A technology of pulse and power supply, applied in amplifiers with semiconductor devices/discharge tubes, electrical components, and adjusting electrical variables, etc., can solve problems such as poor control

Active Publication Date: 2014-01-22
BOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This switching is poorly controlled and can cause undesirable audible artifacts or holes in the amplifier's performance

Method used

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  • Power supply with tickle pulse injection
  • Power supply with tickle pulse injection
  • Power supply with tickle pulse injection

Examples

Experimental program
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Embodiment Construction

[0017] Such as figure 1 As shown in , the power supply 10 includes a tickle pulse generator 12 that periodically injects a "ticker" signal into a pulse width modulator (PWM) controller 14 to provide a pulse width modulator (PWM) controller 14 when the power supply 10 is lightly loaded (e.g. , the load draws 10% or less of the full power capacity of the power supply) to trigger a switching event. The PWM controller 14 includes four terminals: (i) PWM output terminal 14a, (ii) current sense input terminal 14b, (iii) clock input terminal 14c, and (iv) current command input terminal 14d.

[0018] The power supply 10 also includes an alternating current (A / C) line input 16 that is fed through a rectification and filtering stage 18 and delivered to a power switch 20 . The output of the power switch 20 is passed to a transformer 22 and finally to another rectification and filtering stage 24 where it is passed to an output node 23 . The output node 23 is connected to a variable load...

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PUM

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Abstract

A power supply injects a series of 'tickle' pulses into a pulse width modulated (PWM) controller to induce the controller to generate PWM pulses at a minimum switching frequency, preferably one that is super-sonic (especially for audio applications). The switching frequency may also be selected or controlled such that it avoids resonances in the power supply. The 'tickle' pulses may be clocked by the same clock that times the PWM controller, and they may be shaped to help ensure that the power supply maintains some regulation during low-load conditions.

Description

technical field [0001] This disclosure relates to switching power supplies. Background technique [0002] Switching power supplies are commonly used in a variety of applications including audio applications. In audio applications, there are often times when a mains powered audio amplifier draws little or no power. For example, brief silences during the rendering of a song or other audio cause the amplifier to draw relatively little power. This low load condition can cause the switching power supply to switch its power switches at a reduced frequency or to stop switching altogether. This switching is poorly controlled and can cause undesirable audible artifacts or holes in the performance of the amplifier. Contents of the invention [0003] In one aspect, a power supply uses a method for injecting a series of "tickle" pulses into a pulse width modulation (PWM) controller to induce the controller to generate PWM at a minimum switching frequency Pulse, which is preferably...

Claims

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Application Information

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IPC IPC(8): H03F3/20H02M3/156H02M3/335H02M1/00H02M1/44
CPCH02M1/44H02M3/3387H03F3/20Y02B70/10H02M1/0032H02M3/24H03F1/0216H03F3/00
Inventor K·B·德尔帕帕M·纽斯鲍姆A·费伦兹
Owner BOSE CORP
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