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In industrial equipment, there are systems equipped with AC/DC isolated power supplies with large power capacity to drive large loads such as motors. In addition to supplying power to the motor, power is supplied to the control circuit board, etc., from the same AC/DC power supply, or from a separate discrete AC/DC power supply.
From module adoption to discrete design
If you are designing a drive system that uses a motor, etc., you will probably incorporate a large-capacity AC/DC isolated power supply module and use it as a power source for the motor. In that case, I think power is also supplied to the control board from the power supply used by the motor.
I don't think there will be any problems with power supply to the control boards and I/O boards that are included in the system from the beginning, but how about power supply to option boards?
In the case of an option board, it would be difficult to have it supplied from the main power supply, so wouldn't it be necessary to design a separate AC/DC power supply? In such cases, you may not need a large capacity power supply for the option board, so you may want to design it with small discrete components instead of the same module.
AC/DC Discrete Designs Growing in Demand
In conventional motor control applications, as shown in Figure 1-(A), a system is constructed in which a main AC/DC isolated power supply is prepared to supply power to the motor and control board. However, with this configuration, if a problem occurs in the motor-related circuit of the drive system, the main AC/DC will shut down, and the control circuit of the system that should continue to operate will also be shut down, ensuring system safety. Sexuality may be affected.
To avoid this, it is necessary to disconnect the control circuit power from the main AC/DC and supply it from another AC/DC as shown in Figure 1-(B). In this case, you will need to prepare a separate AC/DC power module.
Power supplies for control boards are often low-power, and it is inefficient to incorporate high-power AC/DC modules into the system. The same applies when incorporating an AC/DC power supply for an option board, and there may be constraints on the development schedule when designing a small AC/DC, or there may be AC/DC design assets that can be reused. Isn't there a problem such as not having one?
AC/DC power supply reference board using LT8315
This time, we have developed Macnica original reference board for industrial equipment using a 24V output AC/DC power supply circuit using the LT8315. This enables a system with the power supply configuration shown in Figure 1-(B).
The power that can be output is approximately 3 watts. We believe this is the power capacity that can be used as a power supply for control boards and option boards.
For design information such as circuit diagrams and board layout, please refer to "24V Output Isolated AC/DC Board with LT8315".
Additionally, this article, "Flyback regulator "LT830X" that can use a general-purpose transformer," contains an example of a flyback regulator that uses a general-purpose transformer. Please use this as a reference when designing an isolated power supply circuit.
At the end
In this article, we introduced a reference board for a 24V output AC/DC power supply circuit developed by our company. If you would like more information about the products we have introduced, please contact us here.
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