I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
john larkin <[email protected]> wrote:
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
Class E through G, iirc. Class H makes the supply rail approximately track >the output. (We use that for TEC controllers. )
Cheers
Phil Hobbs
On 1/7/25 20:19, john larkin wrote:
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
class-G (or H) depending on who you ask
https://sound-au.com/articles/class-g.htm
On Tue, 7 Jan 2025 22:27:37 +0100, Lasse Langwadt <[email protected]> wrote:
On 1/7/25 20:19, john larkin wrote:
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
class-G (or H) depending on who you ask
https://sound-au.com/articles/class-g.htm
Cool. Thanks.
I need a power amp that runs near ground most of the time but spikes
to higher output voltage occasionally. And runs 4 quadrant.
I have a switcher design that looks good, but it's slow.
john larkin <[email protected]> wrote:
On Tue, 7 Jan 2025 22:27:37 +0100, Lasse Langwadt <[email protected]> wrote:
On 1/7/25 20:19, john larkin wrote:
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
class-G (or H) depending on who you ask
https://sound-au.com/articles/class-g.htm
Cool. Thanks.
I need a power amp that runs near ground most of the time but spikes
to higher output voltage occasionally. And runs 4 quadrant.
I have a switcher design that looks good, but it's slow.
Our TEC controller is like that, 4-quadrant asymmetric bridge, but current >mode. Too slow for audio, but that�s mostly parts values.
Cheers
Phil Hobbs
On Wed, 8 Jan 2025 00:09:51 -0000 (UTC), Phil Hobbs <[email protected]> wrote:
john larkin <[email protected]> wrote:
On Tue, 7 Jan 2025 22:27:37 +0100, Lasse Langwadt <[email protected]> wrote:
On 1/7/25 20:19, john larkin wrote:
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
class-G (or H) depending on who you ask
https://sound-au.com/articles/class-g.htm
Cool. Thanks.
I need a power amp that runs near ground most of the time but spikes
to higher output voltage occasionally. And runs 4 quadrant.
I have a switcher design that looks good, but it's slow.
Our TEC controller is like that, 4-quadrant asymmetric bridge, but current >> mode. Too slow for audio, but thats mostly parts values.
Cheers
Phil Hobbs
My current design uses a TI DRV8962, which is a quad halfbridge. I'm
using two sections to make a full-bridge bipolar class-D amp. It's a
very cool chip, with lots of current limits and suppy lockouts and
stuff.
One of those chips would make a nice 200 watt stereo amp.
But they only recommend running it at 200 KHz max. I could go a lot
faster with a class G/H linear amp, of course at the cost of a heap of complexity.
Why does a TEC driver run in the goofy quadrants? Does the cooler ever
act as a generator?
I'm designing a dummy load that looks resistive+inductive, like a
solenoid, so it usually runs in the odd quadrants, where the user is
pushing power into us. Sometimes we pretend that we stored some energy
and have to return it.
I recall that there was an audio power amp topology that used two
transistors and two power supplies for each polarity output. Low
voltage swings used a low voltage supply but it cut over to a HV
supply for big swings, with diodes or something.
What was that called?
Class E through G, iirc. Class H makes the supply rail approximately track >>the output. (We use that for TEC controllers. )
Looks like G or H. Thanks.
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