Active load for burn-in test of buck-type DC-DC converter with ultra-low output voltage

A Low-Cost Programmable High-Frequency AC Electronic Load with Energy Recycling for Battery Module Diagnostics

“…However, if the initial charge value determined by the open-circuit voltage method has an error with the actual SOC, the correctness of the calculation result will be affected [20]. In addition, the state of health (SOH) used to indicate the degree of battery aging is generally defined as the ratio of the maximum available capacity of the battery to the rated capacity, and is usually expressed as a percentage [21,22].Nowadays, some research concentrates on SOC and SOH for power batteries, which is an important research topic [21][22][23][24][25][26] because the lithium battery is the most popular power source for electric vehicles (EVs). Yang et al [23] has developed a battery testing system to capture the related information of the battery by a capturing circuit and a loading circuit which is used to release battery energy by various constant currents (CC).…”

“…Currently, there are two battery test techniques that are widely used in industry applications. The simplest is to transfer the extracted electrical energy from the tested battery to the designated backup battery [24]. Additionally, the electrical energy extracted from the tested battery is converted into alternating current (AC) form and then returns to the power grid by connecting with an inverter [25].…”

“…First, the voltage, current, and temperature of all battery cells need to be detected and made sure to be normal. The second part concerns SOC/SOH, which are two critical performance indicators of batteries; many estimation techniques have been proposed in [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] for SOC/SOH. Battery diagnostic techniques can also be combined with chargers, battery analyzers, or monitoring equipment, and suitable diagnostic algorithms and interfaces can be applied according to the type of battery to fully to grasp the electrical characteristics of the battery.Recently it has been recognized that in order to obtain dynamic characteristics for calculating the SOC/SOH of a power battery and to recycle the extracted electrical energy from a tested power battery, a programmable AC electronic load is essential to emulate a variety of dynamic load behaviors, and sequence control is also required [27][28][29][30].…”

“…Nowadays, some research concentrates on SOC and SOH for power batteries, which is an important research topic [21][22][23][24][25][26] because the lithium battery is the most popular power source for electric vehicles (EVs). Yang et al [23] has developed a battery testing system to capture the related information of the battery by a capturing circuit and a loading circuit which is used to release battery energy by various constant currents (CC).…”

Design and implementation of a battery test system with energy recycling technique

“…The first is additional battery scheme [5], the discharge energy from test battery is charged to another chargeable battery by designated charger. The second is by way of grid-tied DC/AC inverter [6,7], it returns the discharge energy from test battery to the power grid. However, there still exists a power loss in those two solutions.…”