PWM pulse width type constant current charging type capacitor energy storage welding charging control system
A charging control and capacitive energy storage technology, applied in battery circuit devices, current collectors, electric vehicles, etc., to achieve the effect of eliminating magnetization
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Embodiment 1
[0039] Such as Figure 1-3 As shown, the PWM pulse width constant current charging type capacitor energy storage welding charging control system includes three-phase charging transformer TR1, single-phase charging transformer TR2, rectification circuit, DC_LINK filter circuit, PWM charging control part, charging current detection part, Welding transformer W.TR, discharge circuit, discharge shutdown circuit, discharge current detection part, discharge control part and capacitor bank.
[0040] The W terminal, U terminal and V terminal of the primary coil of the three-phase charging transformer TR1 are respectively connected to the first phase, the second phase and the third phase of the three-phase electricity, and the two ends of the primary coil of the single-phase charging transformer TR2 Connect the neutral and live wires of the single-phase AC respectively.
[0041] The rectification circuit includes six diodes, wherein the output ends of the fourth diode D4, the fifth dio...
Embodiment 2
[0054] The rectification circuit is provided with four rectification diodes.
Embodiment 3
[0056] The control method of the control system includes the following steps:
[0057] 1. Increase the voltage to the voltage required for charging through a three-phase charging transformer or a single-phase charging transformer;
[0058] 2. Use six (or four) rectifier diodes to form a rectification circuit to convert alternating current into direct current and charge the DC_LINK filter; during initial charging, since the capacitor bank of DC_LINK is in a virtual short circuit state, it is necessary to protect the capacitor bank and charging transformer And the rectification circuit, using the seventh resistor for current-limited charging;
[0059] 3. When the capacitor voltage in the DC_LINK circuit reaches a certain voltage, close the contactor;
[0060] 4. When the contactor is detected to be closed, the charging of the PWM charging control part in the circuit starts to work;
[0061] 5. During the PWM pulse width modulation process, the PWM charging control part uses th...
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