High-precision wide-range isolated DC power supply
A DC power supply and wide-ranging technology, applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, electrical components, etc., can solve problems such as inability to achieve high-precision control of low voltage and small current, and achieve It is convenient for parallel expansion, fast response and large adjustment range
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Embodiment 1
[0039] see figure 1 , The high-precision and wide-range isolated DC power supply includes a three-phase power grid connected to the load through the main circuit, and the controller is connected to the main circuit. It is characterized in that: the main circuit is a mixed topology main circuit, which is composed of a three-phase filter circuit, a three-phase AC-DC converter, a single-phase DC-AC converter connected with a single-phase AC-DC converter; The controller is a programmable high-precision wide-range controller, which is composed of a main control unit connected with a driving circuit a and a driving circuit b, and connected with a voltage sensor and a current sensor through an A / D conversion module; the main control unit The unit adopts DSP chip TMS320F28335, the drive circuit a is connected to the three-phase AC-converter, the drive circuit b is connected to the single-phase DC-AC converter, and the voltage sensor and current sensor collect the AC in the current sou...
Embodiment 2
[0041] see figure 2 , the high-precision and wide-range isolated DC power supply is specifically a photovoltaic cell simulation system with a high-frequency isolation hybrid converter topology. According to the state of the switch on the AC side of the three-phase current source PWM converter, it can be known that the voltage on the AC side is applied to both ends of the DC inductance L. From the AC side, this voltage is based on the 6 voltage vectors generated by the AC switch, such as Figure 4 shown. Depend on image 3 The current space vector sum shown Figure 4 The voltage vectors shown are basically the same. According to the ON / OFF of the AC switch, the voltage on the AC side is applied to both ends of the DC inductance L. From the AC side, this voltage is 6 voltage vectors generated according to the ON / OFF switch, such as image 3 shown. can be seen, image 3 The current vector of Figure 4 The voltage interval vectors are exactly the same. Through analysis we...
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