Zivan High-Frequency chargers
Zivan High-Frequency chargers
Optimal performance with Zivan high-frequency chargers!
HF chargers first transform the alternating current to an inaudible higher frequency between 30,000 and 60,000 hertz and then convert up to 98 percent of the offered alternating voltage into a virtually ripple-free direct current. HF chargers use control electronics instead of large and heavy thyristors and transformers. This makes them smaller and lighter in size and suitable for wall mounting.
High-frequency charger testing is not easy because everything is controlled by a microprocessor (battery voltage, capacity, time, etc.).
Depending on the battery voltage, the charger will supply current according to the charging curve.
If battery voltage is too high charger will not charge with maximum current and so it will be difficult to check if charger delivers full current. (If possible test with sufficiently empty battery with ampere clamp.
Zivan high-frequency chargers are an advanced type of battery charger that uses high-frequency alternating current (AC) to charge batteries more efficiently and effectively than traditional chargers. These chargers are widely used in various applications, from consumer electronics to industrial equipment.
High-frequency chargers offer numerous advantages over traditional chargers, making them the preferred choice for industrial applications. Their efficiency, speed, compactness and smart features not only improve the charging process, but also contribute to sustainability efforts. High-frequency chargers help reduce energy costs through their optimal charging.
Advantages of High-frequency charging over conventional
Characteristics High-frequency
All Zivan high-frequency chargers work in accordance with the principle of SMPS (Switching Mode Power Supply)
Principle: the 220 volt AC or 3 x 380VAC of the network comes to an EMI filter. The filter is located behind the diode bridge. The mains voltage is rectified and then sufficiently smoothed (= AC / DC conversion). This high DC voltage arrives at the primary side of the transformer. The transformer for its part is switched by one or more mosfet(s) or power transistor(s). At the gate or base of the power components, a pulse-counting signal (PWM = Pulse Width Modulation) arrives. This PWM signal causes the cutting of the high input voltage with a high-frequency. The PWM signal is supplied by the control stage which is on its part controlled by the control logic, which gets the information at the battery side. By switching the power component on the primary side of the transformer, there’s a pulse shaped signal at the secondary side, which is rectified backward to a much lower voltage (V) than those at the primary side but with a higher current value (A). Before this current is brought to the battery it passes again through an EMI filter which eliminates the last differences of tension and suchlike
Result: There’s always a constant current to the battery, independent of the variations on the mains voltage.
Chargers repair
Our electronics department is Europe’s largest, best-equipped and most diverse service centre for the repair of electronic parts for lift trucks, mobile elevating work platforms and other industrial vehicles.
All types of chargers – including high-frequency chargers – are repaired in our workshop and then tested on a dedicated power test bench. The tester can simulate any type of battery, regardless of voltage or amperage. Using internally developed software, we can print the charging curve.
