- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364679 > AN4870 The effect of temperature on thyristor performance PDF資料下載
參數(shù)資料
| 型號(hào)： | AN4870 |
| 英文描述： | The effect of temperature on thyristor performance |
| 中文描述： | 對(duì)晶閘管高溫性能的影響 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 76K |
| 代理商： | AN4870 |
4/5
www.dynexsemi.com
AN4870 Application Note
P1
P2
P3
P4
P5
T
1
= O
6
T
2
T
3
T
4
T
5
Time
T
j(1)
T
j(2)
T
j(3)
T
j(4)
T
j(5)
T
j(6)
Junction temperature
T
6
Fig.6
These three input items are then used to calculate instantaneous
power and temperature rise at specified time intervals, e.g. 1ms.
the procedure using the superposition thereom is as follows:
1. Take the initial T
j
at the start of the first 1ms period as T
j
(1).
2. Use this in the
“
surge loop
”
equation to calculate average
power in the first interval. (P1).
3. From the average period power and transient thermal
resistance at 1ms calculate temperature rise in the first
period and hence starting temperature for second period,
T
j
(2) where T
j
(2) = T
j
(1) + T rise (1).
4. Proceed to the second time period and use T
(2) to calculate
appropriate volt drop values and power in this period.
5. Use the average power in period 2 (P2) and the change in
thermal resistance between 1ms and 2ms to calculate the rise
in the second interval. This then gives the temperature at the
end of the second interval, T
j
(3).
6. Continue this procedure for as many intervals as necessary.
The procedure is more clearly explained by considering a
waveform with 5 intervals.
T
j(6)
= P1 [ Z (T
6
-T
1
) - Z( T
6
-T
2
) ]
+ P2 [ Z (T
6
-T
2
) - Z( T
6
-T
3
) ]
+ P3 [ Z (T
6
-T
3
) - Z( T
6
-T
4
) ]
+ P4 [ Z (T
6
-T
4
) - Z( T
6
-T
5
) ]
+ P5 [ Z (T
6
-T
5
) ]
We are using the calculated results as a measure of device
survivability so how reliable are the results
The main assumption is that current flow is uniform across the
device area so that temperature is also assumed uniform. This
means that current pulses must be wide enough to allow the
thyristor to reach full conduction. For small thyristors of a few mm
diameter this is easily achievable for pulses of less than 1ms.
With larger diameter devices e.g. 30 to 100mm, pulses of several
milliseconds are required. For most converter applications this
presents no restriction.
Another possible source of error is the potential inaccuracy of the
transient thermal impedance curve, particularly at times of 1 to
10ms. It is very difficult to measure this part of the curve so
calculation is used. A transmission line model is assumed but
since it is difficult to assign accurate values to the various contact
thermal resistances between metallic parts conservative values
are used. Values depend on surface finishes and clamping
forces.
For times longer than about 100ms heat generated at the
junction starts to pass into the cooling fin. This is not accounted
for in this particular model.
Calculation of temperature rise for short pulses requires more
complex 2 and 3 dimensional analysis, possibly involving finite
element analysis techniques. Device turn-on behaviour and its
dependency on voltage, temperature, di/dt and gate drive has to
be taken into account.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AN4999 | Turn-on of thyristors in parallel |
| AN5001 | Use of the VTO. rT on-state characteristic model |
| AN5111 | TV Sound and Video Receiver Circuit |
| AN5112 | Analog IC |
| AN5120N | TV Video Receiver Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AN48800A | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Low current consumption, high sensitivity CMOS Hall IC One-way magnetic field operation |
| AN48800A-NL | 功能描述:IC HALL SENSOR UNIDIRECT MINI-3 RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數(shù)字式，PWM，8.5 位串行 特點(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
| AN48810B | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Low current consumption, high sensitivity CMOS Hall IC One-way magnetic field operation |
| AN48810B-NL | 功能描述:IC HALL SENSOR UNIDIRECT SMINI-5 RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數(shù)字式，PWM，8.5 位串行 特點(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
| AN48820A-NL | 功能描述:IC HALL SENSOR UNIDIRECT MINI-3 RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數(shù)字式，PWM，8.5 位串行 特點(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。