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Illustrated Cooker Troubleshooting Supor (a)

In Electronic Infomation Category: I | on March 19,2011

1. Supor C19S01 cooker without electricity, power fuse (12 A/25O V) were charred and TL7705ACDR datasheet and blown like

Inspection and TL7705ACDR price and analysis: First, check IGBT full-bridge rectifier tube and TL7705ACDR suppliers and found that the breakdown has been damaged. After the replacement, repair outlet through the self-discharge test, the lamp is not lit, it can explain the primary high-voltage circuit and the IGBT control circuit is normal. But the machine switched on all the lines, place the iron pot test machine, the lamp light the issue, is in the standby state protection, so that there are still whole circuit fault components. At this time should focus on examination of the circuit board.

Board the plane in the physical assembly of circuit components shown in Figure 1. The printed circuit is shown in Figure 2. Circuit shown in Figure 3 (see Fig period) is shown.

After further examination, ultimately ZD201 (20 V Zener diode) Reverse leakage, the reverse resistance of about 520 k. 18 V voltage regulator with a diode (20 V voltage regulator for hand-free diode) replacement, the fault is ruled out.

Circuit shown in Figure 4 (see Fig period).

Summary: In Figure 4, ZD201 (20 V) Zener diodes from the main limiting effect. Work in the circuit, IGBT emitter tube between the gate and there are large parasitic capacitance, and can be up to several thousand picofarads. Therefore, in the driving pulse voltage of the rising and falling on the need to provide some security when the charge and discharge current, to meet the turn-on and off the dynamic requirements, which makes the drive circuit to output a certain degree of peak current.

When IC202 (LM339N) output control signals to Q7 (S8050) turns on, +18 V voltage through R29 (18 ) of the IGBT control gate and the parasitic capacitance between the emitter charging, the charging voltage is greater than IGBT control gate threshold voltage, IGBT turn-on control; control signal when the IC202 to Q6 turns on, IGBT control gate and emitter parasitic capacitance between the charging voltage through R30 (18 ), Q6 and R31 discharge, the discharge voltage is less than the threshold voltage, IGBT tube closed. However, the IGBT turn-on and cut-off control the on / off process, if the pulse duty cycle control signal increase, added to the IGBT gate control voltage will rise, when the elevated voltage exceeds 20 V when ZD201 reverse breakdown conduction, thus preventing the breakdown IGBT tube is damaged.

In the circuit, ZD201 major protective effect. Therefore, when ZD201 reverse leakage, added to the IGBT gate control voltage pipe will drop, and lower than the threshold voltage, so that always is off IGBT tube to form a standby protection.

In addition, there is also worth mentioning that: after the repair of the appliance outlet row of self-made test, if the selection of 100 W bulbs (resistance about 36 ) when the boot, light bulbs flashing about, the induction cooker enter shutdown state; if the choice of 200 W bulbs (resistance about 18 ) when the boot, light bulbs flashing, but the digital display shows E1 (for the under-voltage protection).

Figure 1 Induction motherboard components Supor C19S01 physical map (Click here to see the big picture)

Supor C19S01 Figure 2 Induction of printed circuit board physical map

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