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參數(shù)資料
| 型號： | MR2940 |
| 廠商： | Shindengen Electric Manufacturing Company, Ltd. |
| 英文描述： | Provision for Standby mode operation Partial Resonance Power Supply IC Module |
| 中文描述： | 撥備待機模式操作局部共振電源IC模塊 |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 226K |
| 代理商： | MR2940 |
Shindengen Electric MFG.CO.,LTD
- 7 -
3.2 On-trigger Circuit
The MR2000 Series employs current-critical operation to
detect energy bursts at the secondary side of the main
transformer and switch on the main switching device.
Energy discharge timing is detected at the negative edge
of the control coil voltage waveform (0.2V in the diagram at
right), and the main switching device switched on for
current-critical operation.
The on-trigger detection voltage (0.2V) incorporates a
50mV hystersis to increase noise resistance.
3.3 Partial Resonance
In current-critical switching power supplies (RCC), damping
begins at the resonance frequency (determined by the
primary inductance L
P
of the main transformer and the
resonating condenser C) when the secondary current in the
circuit formed by connecting the resonating condenser
between the collector and GND of the main switching
device reaches 0A.
The discharge current of the resonating condenser flows
through the primary coil and returns energy to the input.
Adjustment of the CR time constant applied to the Z/C pin
(see diagram at right) allows the main switching device to
be turned on at the trough of the damping voltage
waveform, thus permitting a reduction in turn-on losses.
In a circuit using partial resonance, the energy stored in the
resonating condenser during the OFF period of the main
switching device is returned to the input, thus permitting a
reduction in turn-on losses. This allows the connection of a
large-capacity condenser between the collector and GND
of the main switching device, and thus permits a reduction
in noise.
The use of partial resonance is effective in permitting a
simple circuit configuration with improved efficiency and
noise reduction.
Fig.3.3 On-trigger Operation Sequence
Fig.3.4 Partial Resonance
【
V
Z/C
】
0.2V
【
I
C
】
【
Secondary rectification diode current
】
【
V
CE
】
【
Control coil voltage
】
【
I
C
】
【
Secondary rectification diode current
】
【
V
CE
】
Turn-on delay
Damping begins at the
resonance frequency
determined by LP and C.
7
1
3
Z/C pin
Collector
pin
GND pin
C
R
Resonating
condenser
On timing delayed with
CR time constant.
6
Emitter/OCL
pin
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