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GTAKE | Understanding DC Power Supply:

Specifications & Applications

Advances in technology have brought comfort and convenience to human life. Still, environmental protection and the regeneration, efficient use, and recycling of energy resources have become issues that must be emphasized and addressed for the sustainable development of human society.

As the automotive industry evolves, the traditional internal combustion engine drive is gradually replaced by the electric drive, enhancing the vehicle power system performance while reducing fossil energy dependence and carbon emissions. Therefore, the bidirectional DC power supply emerged, with a growing range of applications and occasions. By virtue of its advantages in accuracy, cost, efficiency, and reliability, the bi-directional DC power supply plays an increasing role in the testing system of electric vehicle motors, motor controllers, the powertrain, and the testing of the batteries or battery packs for the performance verification in the progress of R&D, as well as the final off-line charge and discharge test.

Bidirectional DC Power Supply Overview

Bidirectional DC Power Supply

A bidirectional DC power supply is a system that does not only convert from one power source to another, but also focuses on energy recycling. It also largely focuses on DC power in particular. The idea behind these power supplies is to exchange between different sources. Commercial power supply in the form of AC is sent to a bidirectional controller, where it then passes through a DC/DC converter. The direction of the pathway can be reversed, too, allowing power to pass from the DC/DC converter back to the AC/DC converter. These devices are most commonly used for testing purposes, as they are often seen as battery simulators. With this said, there are also other usage cases for bidirectional DC power supply systems. A bidirectional DC source may be used in power transmission and power storage systems, for example, which you can see with options like the GTAKE DC power supply.

Main Performance Characteristics Of Bidirectional DC Power Supply

There are numerous performance characteristics that are associated with a bidirectional DC power supply. Whether looking at the GTAKE DC power supply or an alternative, understanding these characteristics makes it easier to find the right power supply for your situation while also ensuring you know what to expect.

These systems generally feature a wide voltage range and the ability for energy to flow in both directions. With this said, both DC/DC and AC/DC power supply options are available with a bidirectional flow of energy.

Fast response times are also a crucial characteristic when it comes to the performance of these power supplies. As with the GTAKE DC power supply, you’ll notice that precision and reliability are two important components in the performance of these devices.

Apart from these factors, the main capabilities of an option like the GTAKE DC power supply are to serve as a two-in-one structure – to assist with supplying energy, as well as to produce a regenerative load.

Basic Outputs Or Modes Of DC Power Supply Fits Into Various Applications

Numerous use cases for GTAKE DC power supply and similar equipment exist. We’ll talk about some of these applications below.

  • Constantvoltage power supply: A very common operating mode that is used in various power supplies. There is a set output voltage that applies to the entire operation of the power supply.
  • Constant current power supply: Similar to the previous, this power supply retains a consistent current supply throughout the entire system.
  • Current limit power supply: A protective option that can be used when connecting the DC power source, which limits the maximum current that can flow through the system.
  • Power limit supply: The power limit option also puts a restriction on the maximum amount of power that can run through the device.

DC Power Supply Specifications

There are a couple of specifications that you should understand when looking at a DC power supply. This includes standard options and bidirectional DC power supplies.

  • AC Input: The AC input requirements depend on your project and differ from one power supply to another. Larger and higher quality options will often offer support for an AC input between 24 and 1000 volts, such as with the GTAKE DC power supply.
  • DC Output Regulation: The output regulation affects both voltage and currents. It should ideally be 0.1% FS or lower.
  • Accuracy: Greater accuracy can lead to a more reliable system, with the accuracy often measured in percentage. A 96% or higher accuracy is generally desirable.
  • Temperature: DC power supplies are considered temperature sensitive, so consider the components and the recommended operating temperatures. Professional options will usually provide support for an ambient temperature between -10 degrees Celsius and 50 degrees Celsius, but this still differs between various models.


GTAKE has been a top-rated manufacturer of DC power supplies, as well as numerous other power devices, since 2009. If you’re looking for a highly effective bidirectional DC power supply, then head over to our website to see how we can facilitate your project. Our PBDS Series Bidirectional DC Power Supply is a popular option, but we have other GTAKE DC power supply options and related devices available.

A well-known bus manufacturer in China successfully secured an order of one hundred 18-meter hybrid electric buses recently from a Karachi company. GTAKE, as a premium supplier of electric vehicle (EV) motor controller, supplied integrated solutions of EV motor controllers for this batch of buses.

These buses, powered by GTAKE controllers, will be operated in Karachi, the largest city of Pakistan, which further adds GTAKE’s global presence in the field of EV motor controllers.
Karachi, the economic center of Pakistan, is a metropolitan with a population of 20 million. With such a large population base, the issues of road congestion and citizen travel demand are becoming more and more prominent, and there is an urgent need to establish a comprehensive network for public transportation. Two BRT special lines, the orange line and the green line, came into being in Karachi under this circumstance.

BRT ( Bus Rapid Transit), as a new operating system, uses modern bus technology with intelligent traffic management, enabling the traditional bus transportation system basically to reach the level of service of rail transportation, while its investment and operating costs are lower than rail transit and close to conventional buses. With the previous in-depth survey, the customer decided to adopt hybrid system solution for the buses. Models G03 and G04 motor controllers are utilized in the system, according to the proposal presented by GTAKE. The core components of the two controllers are from leading companies, not only guaranteeing the performance,

but also providing quick dynamic response for the operation. GTAKE persists in providing high-quality products by virtue of optimal software system, as well as automotive grade components to ensure safe operation of the vehicle, and provide a comfortable bus travel experience for passengers.

Based on the terrain characteristics of Karachi, this batch of electric buses select to adopt lightweight solution. The controller developed by GTAKE has the advantage of high space utilization, playing a significant role in reducing the weight of the vehicle.

·G03 external dimensions: 488mm × 244mm × 110mm; weight: 13.5kg
·G04 external dimensions: 600mm × 300mm × 142.8mm; weight: 22kg

The GTAKE controllers are able to meet the climbing demand easily. Under the constant power mode, the output torque can be maintained to be stable and sufficient. Through an optimized torque control tactic, the vehicle can run on slopes smoothly and stop comfortably without sliding backward.

·G03 rated voltage: 540V; rated power: 132 kW; peak power: 198 kW
·G04 rated voltage: 540V; rated power: 200 kW; peak power: 300 kW

Energy saving and environmental protection are regarded as two important indexes for a hybrid electric vehicle. During low-speed or decelerating driving, the controller can automatically recognize the operating status of the vehicle, and shift to the mode of electric power supply for the vehicle in order to reduce exhaust emissions. The G03 controller is equipped with the mechanism of energy recycling. It stores regenerating energy dynamically, and monitors the battery capacity at all times, ensuring the vehicle is always in a balanced status and increase the mileage remarkably.

Bus, as a way of transportation to serve the public, is endowed with properties of frequent-use, and prone to go through complex city roads and weather conditions. The safety of the vehicle system, therefore, must be treated as the paramount criterion. The models G03 and G04 motor controllers in the bus are programmed with all-round protections, such as quick protection on short-circuit, overcurrent, overvoltage, over-temperature, overload, encoder disconnection, etc., also their IP grade meets the standard IP67.
These hybrid electric buses are expected to run in Karachi Orange & Green BRT pass in the near future, a beautiful landscape of the city. It will bring convenient travels to local citizens, and significantly contribute to the environmental protection as well. It is also believed it will provide reproducible experience to more cities in Pakistan to carry out the settlement of BRT.

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