PW301 Modular power supply YOKOGAWA

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Essential details：PW301 Modular power supply YOKOGAWA

YOKOGAWA Yokogawa Communication Module Features:

Features and applications of power modules

1. The operating frequency of the power module is high, ranging from 300KHz to 1 MHZ.

2. The power module is small in size and ultra-thin with a thickness less than 10cm and light in weight less than 2kg.

3. The power density of the power module is high, generally 5~10W/ cc.

Manufacturer: Yokogawa Electric Co.
Yokogawa power module PW301. Yokogawa Power module PW301 Dimensions Weight

A power supply module is a power supply that can be mounted directly onto a printed circuit board. It is characterized by the ability to provide power for specific application integrated circuits (ASics), digital signal processors (DSPS), microprocessors, memory, field programmable gate arrays (FPgas), and other digital or analog loads.

PW301

Thyristor structure drawing

Thyristor circuit symbol
Two, the thyristor is like two transistors
Four layers of transistors work like two transistors, they are connected together (as shown below), the output of one forms the input of the other, and the gate acts as a kind of “starting motor” to activate them.

A single thyristor (SCR) is a combination of a pnp transistor (Q 1) and an npn transistor (Q 2). Here, Q1’s emitter is the anode terminal of the SCR, and Q2’s emitter is its cathode. In addition, the base of Q1 is connected to Q2’s collector, the collector of Q1 is connected to Q’s base, and the gate terminal of the thyristor is also connected to Q2’s base.

Thyristor structure drawing
Three, three states of thyristor
So how does a thyristor work? We can put it in one of three possible states, in which it is either completely off or fully on, meaning that it is essentially a binary digital device.

1. Thyristor forward blocking mode
Usually, the thyristor is turned off when no current flows into the grid: no current can flow from the anode to the cathode.

Here you can think of the thyristor as two diodes connected together, with both the upper and lower diodes forward-biased. However, this means that the junction at the center is reverse biased, so the current cannot flow from the top all the way to the bottom. This state is called forward blocking. Although it is similar to the forward bias in conventional diodes, no current flows.

Here, positive bias is applied to the thyristor by connecting the positive terminal (A) to the positive terminal of the battery and the negative terminal (K) to the negative terminal of the battery, as shown below. In this case, junction J 1 and J 3 get a forward bias, while junction J 2 gets a reverse bias.

Here, electric current cannot pass through the thyristor either, except for the tiny current that flows as saturated current, as shown by the blue curve in the characteristic curve below.

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