NOVELTY - The charger has transformer (5), low-frequency capacitors (6) and medium polyethylene capacitor (7) that are arranged at front end of circuit board (9) of outer casing (14). A power switch (2), indicator lights (3), radiating holes (4) and a power supply line (1) are arranged at one end of the outer casing surface. A fan cover (18) and positive and negative power supply wire (20) are arranged at the other end of outer casing surface. Several radiating holes (19) are arranged on two sides of outer casing surface. A handle (17) is arranged on the upper portion of the outer casing.    USE - Charger for charging storage battery used in large agricultural machinery, automobile and marine engine.    ADVANTAGE - The working stability of the charger is improved. The anti-interference performance of the charger is improved. The heating productivity of the charger is reduced. The current output power of the charger is increased. The output accuracy of the charger is improved.    DETAILED DESCRIPTION - One cooling fin is provided with rectifying tube (10), while other two cooling fins are provided with high-power and high-back-pressure FETs (13). Two relays (11) and frequency modulation and pulse width modulation drivers (15) with constant voltages and currents are arranged among cooling fins (8) respectively. Two high-frequency output electrolytic capacitors (12) are arranged in front of a fan (16) on tail portion of the circuit board.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the charger.    Power supply line (1)    Power switch (2)    Indicator light (3)    Radiating hole (4)    High-frequency transformer (5)    Low-frequency capacitor (6)    High-frequency medium polyethylene capacitor (7)    Cooling fin (8)    Circuit board (9)    Large-current high frequency rectifying tube (10)    Large-power contactless relay (11)    High-frequency output electrolytic capacitor (12)    High-power and high-back-pressure FET (13)    Outer casing (14)    Frequency modulation and pulse width modulation driver (15)    Fan (16)    Handle (17)    Fan cover (18)    Radiating hole (19)    Power supply wire (20)