Variable-frequency and one-cycle control method for high-power switched capacitor converter
A capacitive converter, single-cycle control technology, applied to output power conversion devices, conversion equipment without intermediate conversion to AC, electrical components, etc., can solve the problems of slow dynamic response speed and insufficient output voltage modulation accuracy, and achieve Improve the dynamic response speed, good linearity and load modulation effect, and the effect of robust control ability
Active Publication Date: 2018-01-19
XIAN UNIV OF TECH
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However, its output voltage modulation accuracy is not high enough, and its dynamic response to external disturbances is slow
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[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0046] A switched capacitor converter that boosts a switched capacitor converter with three times higher power, such as figure 1 Take the example shown as an example to illustrate a frequency conversion single-cycle control method for high-power switched capacitor converters of the present invention, which is specifically implemented according to the following methods:
[0047] Based on the real-time ampere-second balance law of capacitor charging and discharging, in one cycle (T s = t on +t off ), the capacitor C 1b The charging capacity and discharging capacity of are conserved, and the expression is as follows:
[0048] Q charge +Q discharge =I ch(t t on +I o(t (t on +t off (1);
[0049] In formula (1): I ch(t) is the capacitance C 1b The real-time charge current, I o(t) is the real-time output current of the switched capac...
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The invention discloses a variable-frequency and one-cycle control method for a high-power switched capacitor converter. Control on a high-power double-switch boost switched capacitor converter can beachieved. According to the control method, turn-on time ton of a switch tube S1 is fixed, one-cycle time TS of the switch tube S1 is variable, input voltage Vin, one-cycle time [TS=ton+toff] and output voltage Vo of the double-switch boost switched capacitor converter all are included in a core control algorithm, and external interference in the input voltage Vin and output load can be transiently suppressed through changing a switching frequency; and in addition, overlapping of different control signals can be avoided through setting the turn-on time ton, smaller than a fixed time constant tau of a switched capacitor charging circuit, of the switch tube S1, and due to the action of a resettable integrator, a state variable of a current cycle is irrelevant to that of a historical cycle, thereby achieving a fast dynamic response.
Description
technical field [0001] The invention belongs to the technical field of nonlinear control methods, and in particular relates to a frequency conversion single-cycle control method for a high-power switched capacitor converter. Background technique [0002] Switched capacitor converter is an important branch of switching power supply. Its circuit is only composed of capacitors and switch tubes. Compared with traditional inductive power converters, it has the advantages of light weight, small size, high power density and low EMI. Compared with the inductive switching power converter, its integration is easier to realize, and it has been widely used as the power supply of LED lighting systems, tablet computers, mobile phones, electric vehicles, solar power generation systems and medical implantable devices. However, an important factor that limits the wider application of switched capacitor converters and even replaces traditional inductive switching converters is the limitation ...
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IPC IPC(8): H02M3/07H02M1/08
Inventor 杨磊吴斌同向前宋辉刘普
Owner XIAN UNIV OF TECH