Triple-level DC-DC converter double-closed-loop control
A dual closed-loop control, converter technology, applied in the direction of regulating electrical variables, control/regulating systems, high-efficiency power electronic conversion, etc., can solve the problems of loss of secondary side duty cycle, difficult to maintain a constant output voltage, etc.
Inactive Publication Date: 2014-10-22
SHAANXI REGIONAL ELECTRIC POWER GROUP
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[0012] It should be pointed out that the above control method is an open loop. When the input voltage fluctuates or the load is switched, it is difficult to ensure a constant output voltage. Moreover, due to the existence of phenomena such as driving pulse dead zone and secondary duty loss, Calculated by formula (2) It is not necessarily accurate, so that there is a deviation between the output voltage in the steady state and the set voltage
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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0032] as attached figure 1 The topology of the shown zero-voltage switching half-bridge three-level DCDC converter is mostly controlled by open-loop phase-shift PWM at present. exist figure 1 Among them, T1 and T4 tubes are leading tubes, T2 tube and T3 tube are lagging tubes, T1 tube and T4 tube are complementary conduction, T2 tube and T3 tube are complementary conduction, T1 tube leads the angle of T2 tube and T4 tube leads The angles of the T3 tubes are the same, which is called the phase shift angle. When the phase shift angle is larger, the corresponding output voltage is smaller, and the smaller the phase shift angle is, the larger the output voltage is. Therefore, the magnitude of the output voltage can be changed by adjusting the phase-shift angle. This control method is called phase-shift PWM control.
[0033] Next, a simulation example is used to veri...
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The invention discloses triple-level DC-DC converter double-closed-loop control comprising following steps of: acquiring a reference value of output filter inductor current according to voltage outer loop adjustment; acquiring a phase shift angle according to current inner loop adjustment; calculating the phase shift angles of switching tubes; calculating delay time according to the phase shift angles; and acquiring the driving pulses of the switching tubes according to the delay time in order to control a DC-DC converter to operate. The method acquires the phase shift angle by means of the output voltage outer loop and the output filter inductor current inner loop, then converts the phase shift angle into the delay time, and finally acquires the driving pulses of the switching tubes be means of phase shift PWM so as to control the converter to operate. Compared with a conventional an open-loop control method, the method may perform closed-loop control on output DC voltage such that the output voltage may track a set value and maintain constant in dynamic processes such as load switching and input voltage fluctuation. Therefore, a zero-voltage switching half-bridge triple-level DC-DC converter may operate more stable and high efficient.
Description
technical field [0001] The invention relates to an automatic control technology, in particular to a double closed-loop control of a three-level DC-DC converter. Background technique [0002] High-power high-frequency switching power supply is generally three-phase AC 380V input, and the DC bus voltage after rectification is usually as high as 760-800VDC, or even as high as 1000VDC, which brings great difficulties to the selection of switching tubes in the subsequent DC converter. Since the voltage stress on each switching tube of the three-level DCDC converter is half of that of the two-level DCDC converter, the withstand voltage level of the DCDC converter can be significantly improved. In order to reduce the volume and weight of the DCDC converter, it is necessary to achieve high frequency. To increase the switching frequency and improve the conversion efficiency of the converter, it is necessary to reduce the switching loss. The way to reduce the switching loss is to real...
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IPC IPC(8): H02M3/335
CPCY02B70/10
Inventor 盛成玉陈增发孙振权刘炜陈来军田伟帅
Owner SHAANXI REGIONAL ELECTRIC POWER GROUP