current-logic's blog

DIN rail mount DC-DC Converters

Current Logic now introduce a new series of DIN rail DC-DC Converter. They can quickly snap onto a DIN rail with built-in DIN rail clips that require no additional brackets.

First made converter in din rail mountable enclosure is a 24V to 12V converter with rated power at 100W (120W max). It is for industrial use and is more tightly regulated than former 24V to 12V converter. The module also has an adjustable output from 11~13V. This give user more convenience in designing their own system.

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48V to 24V converter

Current Logic now has a new converter add to non-isolated dc-dc converter family.

48v to 24v converter. This dc-dc converter step down a input of 42-56VDC to 24V output. Like other non-isolated converters from current logic, this switching mode converter have 90%+ effeciency and waterproof casing. Robust and clean design of this module help users to easily plug into their applications.

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Water-cooled DC-DC Power Converter for EV/HEV

Last year we were asked several times whether we have a water-cooled high power dc-dc solution. Current Logic have been providing air-cooled and fan-cooled dc-dc power supply for years, but didn't have water-cooled units.

After some research, we find many EV/HEV projects have a water-cooled solution for power supply. And we decided to explore the ideas. With help of local institute and talented engineers from partner companies, we came to a dc-dc power solution that is for EV/HEV indeed.

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High Power DC-DC Converters, Isolated and waterproof

Current Logic has much experience in making High Power DC-DC Converters

These converters ranges from 500W to 2000W, they were mostly used in mining and energy industry. Recently, as EV and hybrid powered vehicles drawing more and more attention, they begin to appear in vehicles.

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12V to 24V Step-up DC-DC Converter, 72W to 360W

Current-logic.com set up online shop at the beginning of this year, and it seemed working well. More and more products will become 'online' in coming days.

Some typical types available now:

12V to 24V step up converter, 360W max
12v to 48V step up, 150W max
24v to 12v step down converter, 720W max
12/24V to 5V step down, 100W max
36V to 12V step down, 180W max
48V to 12V step down, 120W max

dc-dc converter

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Adjustable Constant Current DC-DC Converter For Solar LED Applications

The current adjustable DC-DC converterin my last post has come out this month. It takes more time to develop than we expected.

The most charming feature of this module is that users can control the output current with potentiometer on board. Current can be set at any number between 750mA ~ 3A, power 2W ~ 100W. This means that user will have most elastic options in different power/current level designs.

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Constant Current DC-DC Converter

The -40~80 degree working temperature DC-DC converter I mentioned last time(12v to 24v, 500W), results in a piece of 220*165*75mm, 4.5 kg rock. Water-proof, shock resistant and other protection like short-circuit, lack input voltage etc.

The client couldn't agree to compromise on the temperature, and the unit price finally come to about $260 for 100 pcs quantity.

I'd like to post the picture of the device, however, it may bother the buyer since it was an OEM product. And it doesn't look very nice. Looking is not that important, right?

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Step Up, Boost DC-DC Converter for Car

dc-dc converter for car

Days ago I received an enquiry asking for a step up dc-dc converter, converting 12v to 24v with 25A output. That is up to 600 Watts. The client was going to use it for radio in Ford cars.

There are plenty company making step down (buck) dc-dc converters, usually reduce 24v/48v to 12v, with maximum 500W output. But a step up (boost) one is not that easy to find, needless to say a 600W one.

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Miniature Power DC/DC Converter for Serial Communication

Origin: Current-logic.com

Serial communication bus transmit data through physical network such as the RS-232, RS-485 and Controller Area Network (CAN) . The applications cover industrial process control, power supply regulation (regulators), as well as point-to-point communications between computers.

These interconnected systems are equipped with their own power supply, and the distance between the systems are often far away. For this reason, we often need to take electrical isolation measures to ensure the physical security of the system, and the need to cut off the ground loop to protect system from high voltage surge impact and reduce signal distortion.

Isolation can protect the system from surge or high voltage and high current damage caused by ground loop, which is most likely to occur when there are a number of ground access in the system . The system is connected by a long cable, and their potential to may not be the same, so current will occur between the two systems. If not isolated, this current will cause noise in the system to reduce the measurement accuracy and even destroy system components.

In industrial environment, the motor start-up and shut down, electrostatic discharge or lightning strikes will generate current through the inductive coupling in the long-distance cables, causing potential rapid change. Such changes can be up to hundreds of kilovolts. If there is no isolation measures taken, the signal or even the system will be damaged. If all the devices connected to bus share the same reference ground, then the system will be free from the impact of this destructive energy, and the isolation between devices can prevent ground loops and the occurrence of surge.

CAN bus typically uses a working voltage of 3V or 5V. In certain areas of industrial control, due to the complexity of the situation, there is high common-mode voltage between each node. Although the CAN bus has a certain anti-interference ability of common interference. However, when the common-mode voltage is higher than the threshold voltage of the receiver, the receiver can not work on, or even chips and equipments will be burned.

In order to achieve complete isolation of systems, all signal lines and power supplies must be isolated. Using isolated DC / DC converter can provide power supply isolation. Current-logic.com offers a wide selection of low cost miniature power DC-DC Converter from 0.1 watt to 2 watts.

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DC / DC Converter Power Supply Selection

DC / DC Converter Supply Selection

origin: www.current-logic.com
DC / DC power module with its compact size, outstanding performance, a notable feature of easy-to-use, has been increasingly widely used in communications, networking, industrial control, railways, military and other fields. Many engineers have been aware of: choosing a suitable DC / DC power modules can save design, debugging problems, and focus more in their field. This can not only improve the overall system reliability, and more importantly, shorten the entire product development cycle. So as to win business opportunities in the fierce market competition. So, how to choose correct DC / DC power modules?

In addition to the most basic functions of voltage conversion, you also need to consider the following aspects:

1. Rated Power
General recommendations of the actual use of power is 30 ~ 80% rated power of the power module(the ratio is also related to other factors, will be discussed latter.). Too low loads lead to waste, too high will product too much heat and are relatively not so stable. A waste of resources to load too light, too heavy on the temperature rise, the negative reliability. Most modules have overload protection, like current-logic.com's products usually provide 120 to 150% bearing, but it is not recommended to work long hours under the over load conditions. After all, this is only a short-term protection measure.

2. Package
Power modules are packaged in a variety of forms. Some are in line with international standards, others are non-standard. The same rated power modules may have different packaging, or the same package have different rated power. So how to choose letters loaded form of it?
There are three major criteria: ①size should be as small as possible in order to save more space for other parts; ② choose types in line with international standards package as far as possible.Because compatibility will be better, and more easy to find replacing supplier; ③ should have the scalability, ease of system expansion and upgrading.
Take current-logic.com's high-power line as an example, they are fully in line with international standards of widely used semi-brick, full brick package, are fully compatible with VICOR, LAMBDA and other well-known brands. The half brick products cover power 50 ~ 200W, full bricks cover 100 ~ 300W.

3. Derating temperature range
Power module manufacturers usually have a few temperature range available: Commodity-grade, industrial-grade, military rank, etc. When choosing module power must take into account the actual needs of the operating temperature range. Different temperature level use different materials and processes, so prices vary greatly. There are two choosing method: One is based on the use of power and package, if the use of power are close to the actual rated power, then the nominal temperature range modules must strictly meet the actual needs with even a slight margin. Second, choose in accordance to the temperature range. If a smaller temperature range is chosen as a result of considering the cost, but the temperature approaches now and then the limits of the situation, what should we do? Derating use. Choose higher power or greater package products, to lower the temperature rise. Thus can be alleviated this contradiction to some extent. Derating ratio of different grades vary with the power, generally is 3 ~ 10W / ℃ above 50W. In short, choice of wide temperature range, the power can be used more fully and smaller package, but higher prices; choice of temperature range or products, lower prices, larger power margin and package.

4. Operating frequency
Generally speaking the higher the frequency, the smaller output ripple noise, the better dynamic response. But the cost will increase, particularly the magnetic components. In the market, power module switching frequency are mostly under 300kHz, or even about 100kHz. They will be difficult to meet dynamically response requirements. User should consider the use of high switching frequency products inapplications of strict requirements . The other hand, when the power module switch frequency is close to the signal frequency, syntonic oscillation will easily occur. User should also take this into account. Current-logic.com power modules have witching frequency up to 500kHz, with excellent output characteristics.

5. Isolation voltage
In general occasions, very high isolation voltage requirements are not needed. However, a higher isolation voltage can ensure power supply module has a smaller leakage current, higher reliability, and better EMC characteristics. Isolation voltage of 1500VDC or above is the level generally accepted.

6. Fault protection
Relevant statistical data shows that, if the power modules in effective life-time out of work, the main reasons for failure is damage caused by external fault conditions. The normal probability of failure is very low. Therefore, to extend of the power module life and improve system reliability, it is important to choose products with comprehensive protection functions. That is to choose products that will automatically protect themselves when external circuit failed to work, and recover to normal automatically after the correction of an external fault. Power module protection function should include at least input over-voltage, under-voltage, soft-start protection, output overvoltage, overcurrent, short circuit protection. High-power products should have the over-temperature protection.

7. Efficiency
For a given output power under certain conditions, the smaller loss of consumption, the higher the efficiency, lower temperature rise, and longer life. In addition normal loss under full load, there are two noteworthy loss: loss of no-load and loss of short circuit (the smaller loss when output short-circuit the higher efficiency is the module). And of course, the smaller the loss is also more in line with the requirements of energy conservation.

www.current-logic.com

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