What component suitable for this project ?

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What component suitable for this project ?

Postby shawntan » Wed Oct 30, 2013 10:46 am

Hi, I'm new here. Wanna ask is it possible to do this ?

Image

When AC supply failure, battery will supply power to a trip device (100 Vdc) to stop the machine.
What component is needed and suitable for this project ?
shawntan
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Re: What component suitable for this project ?

Postby ABSF » Wed Oct 30, 2013 7:45 pm

Assuming the battery voltage is 12V or 24V, that device is a DC/DC step-up converter. It would monitor the 100V DC from the power supply from the transformer. If the mains fails, it should step up the battery and supply voltage to the load. If the mains if good, it would step down the 100V to 12 or 24V to charge the battery. It is more or less a UPS (uninterrupted Power Supply).

Allen
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Re: What component suitable for this project ?

Postby shawntan » Thu Oct 31, 2013 10:31 am

ABSF WROTE:Assuming the battery voltage is 12V or 24V, that device is a DC/DC step-up converter. It would monitor the 100V DC from the power supply from the transformer. If the mains fails, it should step up the battery and supply voltage to the load. If the mains if good, it would step down the 100V to 12 or 24V to charge the battery. It is more or less a UPS (uninterrupted Power Supply).

Allen



Thanks Allen. My problem is will the UPS/battery provide constant supply to load ? Currently, the user may not notice main power supply failure due to battery will continue supply to load when main supply fail. But the load is very sensitive, as time goes by, the battery cannot give constant supply to load. This will damage the load.
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Re: What component suitable for this project ?

Postby ABSF » Thu Oct 31, 2013 3:13 pm

Basically there are two types of UPS.

One type is, the power from mains keeps on charging the battery. While the battery is supplying 100V DC to the load continuously. In this type of design, there would be no interruption when the mains fails. In a telephone exchange, we use this type of UPS. The rectifiers keep charging the 48V batteries, and the 48V DC is distributed to the exchange equipments so when the AC mains fails, the service is not interrupted, or else it would cause the CPU to restart.

In another type of UPS, the load is connected to the rectifiers and at the same time charging the battery. The load is connected to the DC/DC converter through a pair of relay contacts. The mains voltage was monitored and if there is a power failure. The converter would kick in and close the relay contacts and start supplying power to the load. But there is a disadvantage on this as there would be a breakage in between which may cause some sensitive equipments to fail. SO this type of system is seldom used in a places where there's a lot of electronics run by microprocessors or in critical places like a hospital.

Most UPS for PC use the first type so the battery condition has to be monitored and maintained closely. And the battery can only last for 10 to 20 minutes just for you to shut down the PC. In a telephone exchange, there are usually more than 2 sets of batteries and we take the SG and voltage readings weekly.

Allen
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Re: What component suitable for this project ?

Postby shawntan » Thu Oct 31, 2013 6:22 pm

ABSF WROTE:Basically there are two types of UPS.

One type is, the power from mains keeps on charging the battery. While the battery is supplying 100V DC to the load continuously. In this type of design, there would be no interruption when the mains fails. In a telephone exchange, we use this type of UPS. The rectifiers keep charging the 48V batteries, and the 48V DC is distributed to the exchange equipments so when the AC mains fails, the service is not interrupted, or else it would cause the CPU to restart.

In another type of UPS, the load is connected to the rectifiers and at the same time charging the battery. The load is connected to the DC/DC converter through a pair of relay contacts. The mains voltage was monitored and if there is a power failure. The converter would kick in and close the relay contacts and start supplying power to the load. But there is a disadvantage on this as there would be a breakage in between which may cause some sensitive equipments to fail. SO this type of system is seldom used in a places where there's a lot of electronics run by microprocessors or in critical places like a hospital.

Most UPS for PC use the first type so the battery condition has to be monitored and maintained closely. And the battery can only last for 10 to 20 minutes just for you to shut down the PC. In a telephone exchange, there are usually more than 2 sets of batteries and we take the SG and voltage readings weekly.

Allen


I think I found the component to monitor battery power level. I will use Voltage sensitive relay to monitor battery level, if lower than preset level, the battery only supply to certain load (to turn off the machine).
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