- Difference between “DC power supply” and “DC power supply unit for embedding equipment” of PSE
- DC power supply
- DC power supply unit for embedding equipment
Difference between “DC power supply” and “DC power supply unit for embedding equipment” of PSE
First, I will explain the DC power supply.
DC power supply
There is a “DC power supply” in PSE specific electrical equipment.
However, few general switching power supplies are PSE compliant. Why? Isn’t the switching power supply a “DC power supply”?
Since PSE regulates final products (finished products), products incorporated into equipment are treated as “parts”, and general switching power supplies are not regulated by PSE.
In the first place, switching power supplies are rarely used by themselves and are made on the assumption that they will be incorporated into devices and equipment. Evidence of this is that switching power supplies are mounted on a single board or on a chassis with screw holes for mounting to devices and equipment.
A PSE-regulated product, a “DC power supply,” is a single power supply that is sold as a final product in the market. A typical product is a PSE-regulated product because AC adapters for laptop computers and game consoles are used externally and can be bought and sold by the power supply alone. By the way, the AC adapter has a diamond-shaped PSE mark.
DC power supply unit for embedding equipment
The PSE has a power supply called a “power supply unit for embedding equipment“.
Inquiries about whether switching power supplies are subject to PSE or not are increasing, and in 2015, the Ministry of Economy, Trade and Industry notified that general switching power supplies are not PSE-targeted products as “DC power supply units for embedding equipment”. Did.
The Ministry of Economy, Trade and Industry’s “DC power supply unit for embedding equipment” can be summarized as one of the following power supplies. Most common switching power supplies meet this requirement and are not subject to PSE.
①Board type switching power supply
It is a switching power supply for a general board alone. There are connector and terminal block types for input and output. Certainly, the board type cannot be used unless it is incorporated into the device.
②Board-type power supply with chassis and unit power supply
It is a type with a chassis (L sheet metal) attached to the upper board type power supply. In PSE, the chassis is called a “bracket”. The bracket makes it easier to attach to the device.
The unit type power supply is originally equipped with a chassis (without cover).
③Unit power supply with input terminal block cover
A cover is attached to the unit power supply, and the input unit is a terminal block type. Generally, the unit power supply has many input / output terminal blocks.
④Board-type power supply with chassis cover for output connector
It is a board type power supply with a chassis and a cover attached, and the output is a connector type. Generally, for board type power supplies, connectors are the mainstream for input and output.
In summary, the board type power supply and unit power supply are all “DC power supply units for embedding equipment” regardless of whether the chassis cover is removed or attached, and are not subject to PSE.
On the other hand, switching power supplies that do not meet the above conditions ① to ④ are PSE-targeted “DC power supplies.” In other words, it is a board type power supply or a unit type power supply covered with a chassis and a cover, and either the input or output is a cable (harness).
An easy-to-understand example is the SPLFA series made by Cosel. This is a PSE-targeted “DC power supply” of the LFA series of board-type power supplies. The SPLFA series has been discontinued.