Power supply for a measuring device on microcircuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The power supply of simple measuring instruments (avometers, generators, etc.) can be carried out from the proposed simple power source.
The peculiarity of this power supply is that the mains transformer, together with the R3C1 and R1C2 ballast circuits, operates in the current generator mode, i.e., it has a large internal resistance. This made it possible to turn on the zener diode V2 directly after the rectifier (V5-V1) and thus implement the first stage of voltage stabilization. Further stabilization takes place in the electronic stabilizer on transistors V6-V9. The emitter junction of the transistor V8 is used as a reference source.
The control stage is assembled on transistors V6, V7, V9, connected according to the scheme of a composite emitter follower. Ceramic capacitor C6 is designed to reduce the output impedance of the stabilizer at high frequencies.
Transformer T1 has a magnetic circuit W10 x 15. Winding I contains 2600 turns, and winding II - 1300 turns of PEL-2 wire - 0,08.
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| Random news from the Archive Infineon MIPAQ Pro Intelligent Power Builds
04.10.2018
Infineon's MIPAQ Pro family is a fully tested and qualified power assembly consisting of IGBT modules located on a liquid or air cooler, power switch drivers, sensors, digital controls and Modbus communications. The configuration of the connection of power switches inside the assemblies - half-bridge, operating voltage 1200 V and 1700 V. At the moment, versions are available with a rated current of 2400 A, with air and liquid cooling. It is also planned to expand the MIPAQ Pro line with 1800 A assemblies with two cooling options.
The concept of MIPAQ Pro intelligent power assemblies allows you to easily connect up to 4 units in parallel, thus simplifying the scalability of the converter. In parallel operation, the Master-Slave concept is applied, which greatly simplifies the implementation of such a connection. In this case, only Master MIPAQ Pro is connected to the control system. The assemblies have a relatively low weight and a simple system for connecting to the control and diagnostic interface (the connector is horizontally oriented and located inside the unit dimensions, which allows efficient use of space when building the converter), so the installation of the power unit can be done by just one person.
The basis for the reliability of the power blocks are the 4th generation IGBT chips, as well as TIM (Thermal Interface Material) and PressFIT technologies from Infineon. Power assemblies are equipped with a wide range of protection and diagnostic functions. With the help of sensors, current, voltage and data from NTC are controlled. Based on this data, the static and dynamic losses for the IGBT and the diode are calculated. Further, using this information, as well as the matrix of time-dependent values Zth, the temperature of the pn junction of the IGBT and the diode is calculated. This innovative method of monitoring the parameters of the converter allows you to expand the area of safe operation, including operation at its very borders at TVJ=150 °C. Protection levels can be configured by the user.
Features of the MIPAQ Pro line:
high integration (completed power assembly);
a wide range of diagnostic functions and protections;
calculation of TVJ temperature in real time;
control and diagnostics via Modbus;
the possibility of parallel operation of up to 4 assemblies;
security chip to identify the OPTIGA Trust family.
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