Precision heat stabilizer. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Precision heat stabilizer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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The book "Power Semiconductors International Rectifier", irf.com (Voronezh, 1999, run, buy, indispensable book) on page 275 describes in detail the applications of discrete MIS in low-drop voltage regulators. This circuit, with minor (but necessary for a filament circuit) changes, is made in metal (well, I love it - it has many advantages over integral stabilizers).

Input voltage (AC) 11...24 V

The output voltage is adjustable from 6.0V (R4, R5 as in the diagram) or from 2.5V up (R4=0)

The minimum voltage drop depends only on the channel resistance (up to 0.07 V / A with IRFP150. However, this is no longer a stabilization mode)

The maximum load current - practically, depends only on the heat sink.

DC output impedance (including 30cm of 0.5mm0.01 wiring) XNUMX ohm

Stable for any real load

Soft start (turn-on delay 0.5s + smooth increase to 12V in 1s)

Output noise - could not detect (load current 1A, transistor drop 0.5V, multimeter 200mV, 4 digits).

(click to enlarge)

In the real circuit, the ratings are changed: C03, C04 1000uF 35V, C05 2200uF 25V, R2 1kOm 1W. Both the 0V output and + 12V, and the middle point of the filaments, and the output (not power!) + 6V can be grounded. As with the noise in the circuit, the cards will fall, and ground. Main bridge diodes - KD213, multiplier diodes - any 100V, 1A minimum. By the way - the IRFP150 in the photo is not native IR, but Harris - it is easy to distinguish, in IR the contact piece of iron is polished to a shine. Well, okay, they don’t shine, but they work.

Precision filament stabilizer

The board with two independent channels (95*110mm) is attached directly to the chassis. The chassis must be insulated from circuit board tracks. It is possible not to isolate the transistors, but then you automatically ground the +12V outputs, losing other grounding options. The filament current must not be shorted through the chassis! Use twisted pairs.

Precision filament stabilizer

This is of course a simulation, but it reflects reality. Please note - due to the idling of the source in the first second, the voltage on C01-C02 may exceed 16V, so use 25V capacitors.

Publication: klausmobile.narod.ru

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