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Parts explanation
of the electric power controller



TRIAC (TB12B6C)


This is the bidirectional triode thyristor(TRIAC) which I am using this time. It is made by THOABO, but I don't know the detailed data.
    Peak Repetitive Off-State Voltage(VDRM)
      : 600V

    RMS On-State Current(IT(RMS))
      :12A


As for TB12B6C, the heatsink installation part is insulated by the mold. Because it is, the insulation sheet is unnecessary.
When the heatsink installation part uses the type which isn't insulated, you use the insulation sheet(Silicon rubber) according to the necessity.



The main electricity characteristic of the bidirectional triode thyristor
ParameterSymbolMeaning
Peak Repetitive Off-State VoltageVDRM The peak value with the OFF-state voltage which can be repeatedly applied in the condition which opened the gate.
Generally, it shows at the peak value of the commercial frequency sine half wave.
RMS On-State CurrentIT(RMS) The effective value of the ON-state current which can be continuously passed.
Generally, it shows at the effective value of the commercial frequency sine full wave ON-state current.
Peak Repetitive Gate VoltageVGMThe peak value with the gate voltage which can be applied between the gate and the T1 terminal.
Peak Repetitive Gate CurrentIGMThe peak value of the gate electric current which can be applied between the gate and the T1 terminal.
Max On-State VoltageVTM The voltage drop when applying the rated electric current among the main terminals.
Generally, it shows at the peak value of the voltage drop when passing the commercial frequency sine half wave electric current.
Gate Trigger VoltageVGTThe minimum value with the DC gate voltage which is necessary to switch over from the OFF state to the ON state.
Gate Trigger CurrentIGTThe minimum value of the DC gate electric current which is necessary to switch over from the OFF state to the ON state.







Heatsink

I used the heatsink which I had.



The following is written as the reference with the heatsink size at the manual which is attached to the "Light dimmer kit using TRIAC" of the Akizuki Denshi Tsusho.
    The heat value of the TRIAC
      It calculates in the product between VTM (the ON-state voltage = 1.5 V) and the load current of the triac.
    The maximum consumption electric current and the heatsink of the load
      (The heatsink is the aluminum board with the 2-mm thickness)
      8A:12W5 x 5cm
      10A:15W6 x 6cm
      16A:24W7 x 7cm
      20A:30W9 x 9cm

When putting the electric power controller in the case of the metals such as the aluminum, the case becomes the heatsink if installing the triac at the case.



Silicon grease

The silicon grease is put in the thermal conductivity to improve theheat conduction between the triac and the heatsink. The silicon grease is the compounding of the white grease. The metallic oxide is mixed in it to improve the thermal conductivity. The silicon grease is painted to the back of the triac. You don't need to paint a lot of it. There is not an effect in the part which was stuck out of the triac.




Trigger diode ( N413 )

This time, the trigger diode which I am using is N413 which is made by NEC.
The breakover voltage (VBO) of N413 is up to 40 V from a minimum of 26 V according to the data sheet.
Because there is not polarity, it is OK even if you install in any direction.




Diode bridge ( W02G )


I used the diode bridge for the diode of the hysteresis prevention circuit.
I used the one of the maximum voltage of 200 V, and the maximum forward direction electric currents of 1.5 A. As for the flowing electric current, because it is little, the one with the smaller capacity is OK.
It is necessary to be careful so as not to make a mistake in the connection of the pole.
The four diodes can be used instead of the diode bridge, too.




Trigger circuit resistor

This is the variable resistor which controls the electric power.
The 2.2k-ohm fixed resistor is put in series with the variable resistor. When minimizing the variable resistor, this resistor is to prevent that the phase of the pulse which is applied to the gate of the triac becomes below the 0 degrees.
The 1/2-W resistor is used.




Hysteresis prevention circuit resistor


When the polarity with the input voltage changes, the electric charge of the timing capacitor is making discharge with the hysteresis prevention circuit.
These are the resistors to apply the electric current to the diodes for the electric charge of the capacitor to make discharge.
The 1/2-W resistor is used.





Timing capacitor


This is the capacitor to shift the phase of the pulse to apply to the gate of the triac.
I am using the polyester film capacitor of 0.1 F 50 V.
There is not polarity.






Universal printed board



I used the one of 15 halls x 25 halls.

The universal printed board





Cable terminal



This is the terminal to connect the cable of the input and the output. It is not necessary to use the one of this shape. Also, if connecting the wire with direct to the printed board, it is not necessary to use this terminal.





Metallic stud



I use this to install the printed board to the case. There is not necessity of the metal.
I used the one with the 5-mm height for the 3-mm screw.