TCM1030P 查看數據表（PDF） - Power Innovations Ltd

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TCM1030P

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS

Power Innovations Ltd 

TISP61060D, TISP61060P

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS

PROGRAMMABLE OVERVOLTAGE PROTECTORS

SEPTEMBER 1995 - REVISED SEPTEMBER 1997

10

0

-10

-20

-30

-40

-50

-60

0

750

500

250

0

-250

-500

-750

0

VG

5

VK

10

Time - ms

15

IG

IK

5

10

15

Time - ms

Figure 3. IC PROTECTOR POWER CROSS WAVE FORMS

20

100

75

50

25

0

-25

-50

-75

-100

20

AI6XAG

thyristor to switch into the low-voltage on-state condition. At the end of the negative half cycle, the thyristor

switches off when the current falls below the holding current value (300 mA). Switch-off and re-clipping at

-52 V causes a second pulse of gate current. The wire current drawn by the protector is quasi-sinusoidal

During the positive a.c. voltage period (diode clipping) there is no gate current. During the negative a.c.

voltage period there are two triangular pulses of gate current, which peak at about 80 mA. This is current

which flows into the gate terminal as indicated by the IG current arrow in Figure 2. This direction of current

charges the VBAT supply. This would not be a problem if the VBAT supply was a rechargeable battery.

However, often the supply is generated from a switching mode power supply or the SLIC supply feed has a

series diode which blocks reverse (charging) current flow to the battery. In these cases the supply can only

sink current in the direction shown by the IBAT arrow in Figure 2. Unless the SLIC current, ISLIC, is equal or

greater than IG the value of VBAT will increase, possibly to a level which causes destruction of the SLIC.

The maximum average value of IG occurs when the thyristor only clips the voltage and the peak cathode

current is just beginning to approach the switching (IS) value, see Figure 4. The average current is maximised

under high source impedance conditions (e.g. 600 Ω). In the case of the LB1201AB, it is recommended that

the supply should be able to absorb 700 mA of “wrong way” current. If the supply cannot absorb the current

then a shunt breakdown diode is recommended to provided a path for the gate current to ground (D2 in

Figure 2). High power diodes are expensive, so diode D2 is usually low power, purposely selected to fail

under this a.c. condition and protect the SLIC.

PRODUCT INFORMATION

7

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