由买买提看人间百态

boards

本页内容为未名空间相应帖子的节选和存档,一周内的贴子最多显示50字,超过一周显示500字 访问原贴
EE版 - something wrong with 2843 chip.
相关主题
问个flyback电源设计问题最近形势惨不忍睹...
a very weird no-load loss在半导体公司做PE方面的Applications Engineering前途如何?
选课请教,Power Electronics,很急,多谢!!~各位前辈给我这个普通电子类毕业生指条路
有做solar microinverter的吗?实验室用小功率低压直流电源哪儿有卖的?? (转载)
发一个Georgia的工作Vcc vs. Vdd
Would you show me a good gate driver chip for 100% duty cycle?请教-保护电路设计问题
哪些地区EE比较好找工作一些如何设计一个INVERTER???
大公司,小公司?如何提高数字电路的输出驱动电流?
相关话题的讨论汇总
话题: chip话题: 2843话题: discharged话题: fan7529话题: something
进入EE版参与讨论
1 (共1页)
g******u
发帖数: 3060
1
抱歉,原来发在英文论坛上的,就直接转贴了。
I built a power-factor-corrected battery charger using Fairchild's
FAN7529 PFC chip and Onsemi's UC2843 constant frequency PWM chip. Basically
it's a boost converter driven by FAN7529 followed by 2843 chip driven
flyback.
It worked fine on my bench for hours. But the customer made a test on a
very deeply discharged battery set (somehow discharged to 8V for 24V
batteries, near dead ones to me) and they said something was not ideal.
When I re-test the returned unit,
E*****a
发帖数: 757
2
你的Ct有没有温度或者电压derating的问题??
换个好的Ct看看?

Basically
up

【在 g******u 的大作中提到】
: 抱歉,原来发在英文论坛上的,就直接转贴了。
: I built a power-factor-corrected battery charger using Fairchild's
: FAN7529 PFC chip and Onsemi's UC2843 constant frequency PWM chip. Basically
: it's a boost converter driven by FAN7529 followed by 2843 chip driven
: flyback.
: It worked fine on my bench for hours. But the customer made a test on a
: very deeply discharged battery set (somehow discharged to 8V for 24V
: batteries, near dead ones to me) and they said something was not ideal.
: When I re-test the returned unit,

j***j
发帖数: 324
3
1 , change to a new chip to see if it is because of that.
2, if same performance, check that if not in the deep discharged cases, it
still behave weird...( i guess not)...which means that it is only the
problem when output voltage is low...
3, not sure how you generate the Vcc, if Vcc comes from the output voltage,
that may be the problem of UVLO (not sure). Anyway, you can try to connect
Vcc with a constant external power supply to see if it helps...
if every setup is ok, but problem is still

【在 g******u 的大作中提到】
: 抱歉,原来发在英文论坛上的,就直接转贴了。
: I built a power-factor-corrected battery charger using Fairchild's
: FAN7529 PFC chip and Onsemi's UC2843 constant frequency PWM chip. Basically
: it's a boost converter driven by FAN7529 followed by 2843 chip driven
: flyback.
: It worked fine on my bench for hours. But the customer made a test on a
: very deeply discharged battery set (somehow discharged to 8V for 24V
: batteries, near dead ones to me) and they said something was not ideal.
: When I re-test the returned unit,

g******u
发帖数: 3060
4
你是个天才。
确实那个timing电容坏了。现在一切正常。
奇怪的是它的电压和温度rating都挺高的,不至于坏。
也排除了污染的问题。

【在 E*****a 的大作中提到】
: 你的Ct有没有温度或者电压derating的问题??
: 换个好的Ct看看?
:
: Basically
: up

E*****a
发帖数: 757
5
谢谢褒奖。
焊接的时候温度高就可能坏。而且根本看不出来。或者在周围吹过热风

【在 g******u 的大作中提到】
: 你是个天才。
: 确实那个timing电容坏了。现在一切正常。
: 奇怪的是它的电压和温度rating都挺高的,不至于坏。
: 也排除了污染的问题。

1 (共1页)
进入EE版参与讨论
相关主题
如何提高数字电路的输出驱动电流?发一个Georgia的工作
DC/DC converterWould you show me a good gate driver chip for 100% duty cycle?
清教下怎么用ADC测量电阻?哪些地区EE比较好找工作一些
有人用过linear的片子么大公司,小公司?
问个flyback电源设计问题最近形势惨不忍睹...
a very weird no-load loss在半导体公司做PE方面的Applications Engineering前途如何?
选课请教,Power Electronics,很急,多谢!!~各位前辈给我这个普通电子类毕业生指条路
有做solar microinverter的吗?实验室用小功率低压直流电源哪儿有卖的?? (转载)
相关话题的讨论汇总
话题: chip话题: 2843话题: discharged话题: fan7529话题: something