1. Features:

① Low coupling capacitance makes it have high anti-interference ability;

② Small leakage inductance ensures better output pulse waveform;

③ No switching delay, high instantaneous transmission power;

④ High electric strength, safe and reliable;

⑤ Fully enclosed, good mechanical and environmental resistance;

⑥ Small size, compact structure, beautiful appearance, pin-hole installation, easy to use.

2. Ambient Conditions:

① Ambient temperature: -40 ℃ ~+85 ℃;

② Relative humidity: ≤ 90% at 40 ℃;

③ Atmospheric pressure: 860~1060mbar (about 650~800mmHg).

3. Insulation and heat resistance grade : Class B (130 ℃ )

4. Safety features:

① Insulation resistance: greater than 1000MΩ under normal conditions;

② Flame retardancy: in line with UL94-V0 level.

5. Comparison table of typical characteristics of various models of DRT series high withstand voltage drive transformers:

Note:

① The parameters given in the above table are typical values measured at room temperature.

② The meaning of each parameter:

u— transformation ratio = Ⅰ:Ⅱ:Ⅲ

V_P — the effective value of the dielectric strength test voltage applied between each winding, and the duration is 60s

∫udt— Rated volt-microsecond product ≈V₁ ·t_n ( its value basically remains unchanged within a certain frequency range )

L_P —coil primary inductance f=1000Hz V=0.3V

L_S —Leakage inductance (measured after the secondary winding is short-circuited) f=1000Hz V=1V

C_K —distributed capacitance f=1000Hz V=1V

6. Selection Guide:

① First according to the operating voltage V of the system. ( effective value ) to determine the required dielectric strength Vp, which can be selected according to the recommendation in Table 1 :

    Table 1 :

② Select the transformation ratio according to the power supply voltage of the control stage and the driving voltage required by the IGBT.

For example: if the primary pulse amplitude is 15V, in order to drive the IGBT reliably, it is necessary to select a driving transformer with a transformation ratio of 1:1, such as DRT801/101A, DRT801/111B or DRT802/101A. If the primary pulse amplitude is 24-30V, in order to drive the IGBT reliably, it is necessary to select a driving transformer with a transformation ratio of 2:1, such as DRT801/201A, DRT801/211B or DRT802/201A.

③ According to the volt-microsecond product (∫udt) and the frequency of the driving pulse ( f p), the type selection is based on the principle that the volt-microsecond product of the known driving pulse should be less than or equal to the rated volt-microsecond product of the DRT drive transformer within the frequency range.

For example: if the frequency of the modulating pulse is 20k Hz, the pulse amplitude is 15V, and the pulse width is 20μs, then its volt-microsecond product ∫udt=15×20=300 μVs, according to the known volt-microsecond product of the driving pulse The principle selection should be less than or equal to the rated volt-microsecond product of the DRT drive transformer in the frequency range, and the DRT802 series products can be selected. If the frequency of the modulated pulse is 50kHz, the pulse amplitude is 24V, and the pulse width is 10μs, then its volt-microsecond product ∫udt=24×10=240μVs, according to the known driving pulse, the volt-microsecond product should be less than or equal to this frequency The principle selection of the rated volt-microsecond product of the DRT drive transformer within the range, the DRT801 series products can be selected.