VALUE = BYTE VALUE x RESOLUTION

FPS1000 Instruction Manual

7.4.3 Analog functions

Analog functions are provided by a single PCF8591, 4-channel 8-bit A/D converter. When this device is read by the serial buscontroller it provides an 8-bit word with the following information:

Channel 1: Output voltage,

channel 2: Output current,

channel 3: Internal temperature.

The PCF8591 slave address is:

Bit Value

7

6

5

4

3

2

1

0

1

0

0

1

A2

A1

A0

R/W

The PCF8591 device initially requires a control byte to be written to the configuration register. The control byte is as follows:

Bit

Value

7

6

5

4

3

2

1

0

0

A

0

0

0

B

C

D

When a single channel is to be read, A,B,C and D should be determined as follows:

A/D channel

A

B

C

D

Voltage

0

0

0

0

Current

0

0

0

1

Temperature

0

0

1

0

To read all channels with a single control byte, A and B have to be "1", C and D have to be "0". This control byte sets the device so that on each successive read the data from the next A/D is read.Thus, the first result from a sequence of reads should not be considered.

Note that on each read, a conversion is started for a particular channel and the result will be read from the previous channel.

7.4.4 A/D Scaling

The A/D readback has to be scaled to obtain a correct value for the voltage, current and the temperature. Note that the voltage reading is made inside the power supply unit before the "Oring" diode and is typically 0.5V higher than the actual output voltage.

The following scaling should be employed:

Refer to the following table for the scaling of the A/D channels:

FPS1000-12/S

 

0~15V

0.0586 V/Bit

0~80A

0.312 A/Bit

0~100°C

0.391°C/Bit

FPS1000-32/S

FPS1000-24/S

FPS1000-48/S

The measurement range is from 0 to the maximum value listed in the range column. The resolution or scale of reading is linear over the entire range and provides a linear output on the A/D converter.

7.5 Measurements and calculation examples 7.5.1 Output voltage readback

The voltage before the "Oring" diode is measured and can be read from the A/D converter. This voltage is higher than the voltage at the output terminals by 0.5V typically.

Model: FPS 1000-48/S

1.Output voltage (at the output terminals): 48.0V

2.Voltage before the "Oring" diode: 48.0V+0.5V=48.5V

3..Hex readback: CE (1100 1110).

4.Convert the hex readback to decimal: 206

5.Calculate measured Vout: Vout=206*0.2344=48.286V

7.5.2 Output current readback

The output current is sensed by an internal shunt and measured by an A/D converter. Refer to the following examplefor current readback calculation.

1.Actual output current: 21.0A

2.Hex readback: E0 (1110 0000).

3.Convert the hex readback to decimal: 224

4.Calculate measured Iout: Iout=224*0.0977=21.884A.

21

Page 24
Image 24
TDK FPS-T1U, FPS1000-12, FPS-S1U, FPS1000-48, FPS1000-32, FPS1000-24 Analog functions, 4 A/D Scaling, Output current readback

FPS1000-32, FPS-S1U, FPS1000-48, FPS1000-12, FPS-T1U specifications

TDK has established itself as a leading innovator in power supply solutions with its range of FPS series products, specifically designed for various demanding applications. Among these, the FPS1000-24, FPS-T1U, FPS1000-12, FPS1000-48, and FPS-S1U models stand out due to their advanced features, robust technologies, and versatile characteristics.

The FPS1000-24, catering to a voltage output of 24V, is ideal for both industrial and commercial applications. It delivers a notable output power of 1000 watts while boasting high efficiency, making it a reliable option for systems that require consistent power with minimal energy loss. The model incorporates advanced protection features including over-voltage, over-current, and short-circuit protection, ensuring that connected devices are safeguarded against potential electrical faults.

Similarly, the FPS1000-12 offers a 12V output with equivalent power ratings, making it suitable for applications such as telecommunications and medical devices where stability and reliability are paramount. This model also emphasizes thermal management, utilizing integrated cooling technologies to maintain optimal performance even under demanding conditions.

The FPS1000-48 distinguishes itself with a 48V output, which is increasingly prevalent in high-density computing environments and server applications. With enhanced scalability, this model allows for multiple unit configurations to support higher load demands while maintaining exceptional efficiency levels.

In addition to the standard offerings, TDK’s FPS-T1U and FPS-S1U models provide intelligent power management solutions. The FPS-T1U, being a compact version, is tailored for space-constrained environments, ensuring high performance without compromising on size. It features built-in monitoring capabilities that allow users to track power usage and efficiency metrics in real-time.

The FPS-S1U is particularly notable for its modular design, enabling easy integration into various systems. This flexibility allows users to adapt the power supply to specific system requirements, enhancing functionality across diverse applications. Both models leverage cutting-edge technology to ensure low standby power consumption, reducing the overall energy footprint.

Overall, TDK’s FPS series exemplifies a commitment to quality, performance, and adaptability, making them ideal candidates for modern power supply needs across industries. With their comprehensive protection mechanisms, efficiency, and innovative designs, they stand as reliable choices for engineers and designers looking to optimize their systems.