background image

1.6 Output ripple and ripple noise

¡

Output ripple noise may be influenced by  measurement environ-
ment, measuring method fig.1.1 is recommended.

+Vout

-Vout

Load

150mm

C

2

C

1

Osilloscope/

Ripple noise meter

Bw:20MHz

Differential probe

+

C

1 : 

Film capacitor 0.1μF

C

2 : 

Aluminum electrolytic capacitor 22μF

Fig.1.1 Measuring method of Ripple and Ripple Noise

Remarks :

 

When GND cable of probe with flux of magnetic force from power 
supply are crossing, ripple and ripple noise might not measure 
correctly.

  Please note the measuring environment.

Bad example

Good example

Fig.1.2. Example of measuring output ripple and ripple noise

1.7 Isolation

¡

For a receiving inspection, such as Hi-Pot test, gradually increase 
(decrease) the voltage for the start (shut down). Avoid using Hi-
Pot tester with the timer because it may generate voltage a few 
times higher than the applied voltage, at ON/OFF of a timer.

¡

When you test units for isolation between the input and output, or 
between output and terminal FG, short-circuit between output and 
remote ON/OFF connector.

1.8 Reducing standby power

¡

Burst operation at light loading, the internal switch element is in-
termittent operated, and the switching loss is decreased.

  The specification of the Ripple/Ripple Noise changes by this in-

termittent operation. The value of the Ripple / Ripple Noise when 
intermittent operates changes in the input voltage and the output 
current.

¿ 

LHA100F, LHA150F, LHA300F

¡

In option -R2, standby power with remote OFF is lower than the 
one with no load.

  Please refer to instruction manual 6.1.

2   Series Operation and 

Parallel Operation

2.1 Series Operation

¡

You can use a power supply in series operation.  The output cur-
rent in series operation should be lower than the rated current of a 
power supply with the lowest rated current among power supplies 
that are serially connected.  Please make sure that no current ex-
ceeding the rated current flows into a power supply.

(a) 

 

 

      (b)

Load

Power 

Supply

+

-

+

-

Power 

Supply

Load

Load

Power 

Supply

+

-

+

-

Power 

Supply

Fig.2.1 Examples of connecting in series operation

2.2 Parallel Operation

¡

Parallel operation is not possible.

¡

Redundancy operation is available by wiring as shown below.

I

2

I

1

I

3

-

+

+

-

Load

Power

Supply

Power

Supply

Fig.2.2 Example of redundancy operation

¡

Even a slight difference in output voltage can affect the balance 
between the values of I

1

 and I

2

.

Please make sure that the value of I

3

 does not exceed the rated 

current of a power supply.

I

3

 

[

 the rated current value

AC-DC Power Supplies Open Frame

Instruction Manual

LHA-26

May 26, 2022

Содержание LHA100F

Страница 1: ...age adjustment range LHA 25 1 6 Output ripple and ripple noise LHA 26 1 7 Isolation LHA 26 1 8 Reducing standby power LHA 26 6 1 Outline of options LHA 32 6 2 Output side attaching external capacitor...

Страница 2: ...n If you need to use a switch on the input side please select one that can withstand an input inrush current Thermistor is used in the inrush current limiting circuit When you turn the power ON OFF re...

Страница 3: ...switching loss is decreased The specification of the Ripple Ripple Noise changes by this in termittent operation The value of the Ripple Ripple Noise when intermittent operates changes in the input vo...

Страница 4: ...o 100 77 77 Io 40 85 83 15 24V A 50 Io 100 77 77 Io 50 85 83 B 70 Io 100 80 80 Io 70 85 83 C 50 Io 100 80 80 Io 50 85 83 D 70 Io 100 78 80 Io 70 84 83 E 50 Io 100 77 80 Io 50 83 83 F 50 Io 100 77 77 I...

Страница 5: ...3 3 5V A 20 Io 100 76 78 Io 20 85 77 B 20 Io 100 76 72 Io 20 88 76 C 20 Io 100 74 81 Io 20 84 80 D Io 100 75 71 E 10 Io 100 76 84 Io 10 87 77 F 10 Io 100 75 78 Io 10 85 81 12 48V A 20 Io 100 83 73 Io...

Страница 6: ...5 91 82 Forced air 12 48V A B C D E F 70 Io 100 75 75 Io 70 75 75 Table 3 7 Maximum temperature of measurement points LHA150F O Cooling Method Voltage Mounting Method Load factor Maximum temperature C...

Страница 7: ...ion 3 3 5V A B C Ta 30C or less 10years or more 8years Ta 40C 10years or more 4years D E F Ta 25C or less 10years or more 6years Ta 35C 9years 3years 12 48V A B C Ta 40C or less 10years or more 7years...

Страница 8: ...tage Mounting Method Average ambient temperature year Warranty Io 75 75 Io 100 Convection 3 3 5V A B C Ta 30C or less 5years 5years Ta 40C 5years 3years D E F Ta 25C or less 5years 5years Ta 35C 5year...

Страница 9: ...23722 5 Chain 1123721 1 Loose 1318912 1 CN2 1 1123723 2 1 1123722 2 Chain 1123721 1 Loose 1318912 1 Mfr TE Conncectivity LHA30F LHA50F Connector Mating connector Terminal CN1 1 1123724 3 1 1123722 5 C...

Страница 10: ...ting resistor R To calculate a current limiting resistance value please use the fol lowing equation R W Vcc 1 1 RiX0 005 0 005 Please wire carefully If the wire incorrect the internal components may b...

Страница 11: ...temperature of measurement points LHA30F 3R3 SNY LHA30F O SN Cooling Method Voltage Mounting Method Load factor Maximum temperature C 1 Capacitor 2 Capacitor Convection 3 3 12 15 24V A 75 Io 100 77 6...

Страница 12: ...o 25 83 87 Forced air 3 3 48V A B C D E F 70 Io 100 75 75 Io 70 75 75 Table 6 7 Maximum temperature of measurement points LHA75F 3R3 SNY LHA75F O SN Cooling Method Voltage Mounting Method Load factor...

Страница 13: ...84 78 Forced air 5 48V A B C D E F 70 Io 100 75 75 Io 70 75 75 Table 6 9 Maximum temperature of measurement points LHA150F O SN Cooling Method Voltage Mounting Method Load factor Maximum temperature...

Страница 14: ...a 30C or less 10years or more 7years Ta 40C 10years or more 3years 15 24V Ta 30C or less 10years or more 10years or more Ta 40C 10years or more 7years Forced air 3 3 24V A B C D E F Ta 40C or less 5ye...

Страница 15: ...less 5years 5years Ta 50C 5years 3years 15 24V A C E Ta 40C or less 5years 5years Ta 50C 5years 3years B D Ta 45C or less 5years 5years Ta 55C 5years 3years Forced air 3 3 24V A B C D E F Ta 60C or le...

Страница 16: ...s 3years T LHA300F Option T units has changed the I O interface from the connec tor to the terminal block M3 5 Type Refer to fig 6 3 for terminal arrangement The size specification is different from s...

Страница 17: ...6 Connecting method of Stranded wire How to release the Ferrule terminal Solid wire and Stranded wire Step1 Insert a flat blade screwdriver into the release hole Refer to the fig 6 7 a Step2 Remove th...

Страница 18: ...s can adjust the output voltage by attached poten tiometer Refer to the adjustable range to the table 6 30 and table 6 31 LHA10F LHA15F LHA30F LHA50F LHA75F LHA100F Table 6 30 Output voltage adjustmen...

Страница 19: ...3V 0 to 9200 5V 0 to 9200 0 to 240000 12V 0 to 4200 0 to 8700 0 to 6300 0 to 5600 15V 0 to 4200 0 to 8700 24V 0 to 2800 0 to 6300 0 to 2800 0 to 4900 36V 0 to 1600 0 to 1600 0 to 1600 48V 0 to 1200 0...

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