resonant converter control

This has contributed to limiting such power switches to low power applications during high frequency operation. 3,4,5, the operational modal analysis of carrying out solid frequency pulse-width regulated control model as Fig. [6, 7, 19] have been used to optimise LLC resonant converters because of strict efficiency requirement for power converters. The template and the circuit are shown below. This paper proposes a new Bang-Bang Charge Control (BBCC) method for resonant converters. But for the slight hysteresis, it may be assumed that at the zero current V6 is high and when current flows V6 is low. It is assumed in Baker, supra, that the current flowing through the resonant tank circuit is zero during this dead time interval and, hence, that switching operation of the power switches will not dissipate energy. Resonant inverters are electrical inverter based on resonant current oscillation. The converter employs a pair of power switches each, when on, completing a series resonant circuit from the source to a resonant tank circuit including the primary winding of a transformer coupled to the output circuit. This book provides a comprehensive, single-source on resonant switched-capacitor converters. Having briefly described the operation of a power supply in conjunction with FIG. The simulation and the Steady State Solver results are shown at the minimum input voltage (320V) and rated output voltage (48V). As Figure 1-5, this LLC controlled resonant converter underload control device comprises controller, for making controlled resonant converter be operated in the frequency modulation module under the frequency adjustment control model and determine the wide module of tune under frequency pulse width control pattern for controlled resonant converter is operated in, the output voltage signal of nursing one's health for the hardware circuit that detects respectively the LLC controlled resonant converter and voltage detection unit and the current detecting unit of output current signal, described controller also is connected with the feedback compensation error amplifier, described voltage detection unit and reference voltage power supply are connected respectively the input of feedback compensation error amplifier, described current detecting unit connects the input of controller, the output of described controller is connected with the operational module switch unit, described frequency modulation module is connected respectively controller and operational module switch unit with the wide module of tune, described operational module switch unit connects controlled resonant converter switch controlled end, the output current signal that the error voltage signal that the output voltage that described controller detects according to voltage detection unit is exported after the feedback compensation error amplifier and current detecting unit detect judges whether the LLC controlled resonant converter works in light-load state, if be not operated in underload, by the operational module switch unit, select the work of frequency modulation module, carry out the frequency adjustment control model, if be operated in underload, by the operational module switch unit, select to adjust wide module work, carry out determining frequency pulse width control pattern, realize the duty cycle adjustment voltage gain, and export corresponding switch controlled signal to the switch controlled end through the operational module switch unit.Described in determining the processing of frequency pulse width control pattern cycle, fixed switching frequency is resonance frequency, and, according to different load output voltage voltage stabilizing requirements, calculates PWM duty ratio D.PWM is pulse-width regulated, and the application's the frequency pulse width control pattern of determining is the pulse-width regulated control mode that is fixed frequency.Here determine that fixed switching frequency and load output voltage stabilizing require the relation existed with PWM duty ratio D, have the effect of optimizing the resonant network parameter. 4/13/2013 3. LLC controlled resonant converter underload control device according to claim 5, is characterized in that, described PWM duty ratio is for regulating the gain of controlled resonant converter interior resonance network voltage, and described underload resonant network voltage gain computing formula is. Sliding-mode control has been widely used in both nonlinear and linear systems. In above-mentioned LLC controlled resonant converter underload control device, described duty cycle range is, In above-mentioned LLC controlled resonant converter underload control device, described PWM duty ratio is for regulating the gain of controlled resonant converter interior resonance network voltage, and described underload resonant network voltage gain computing formula is. Consequently, the dead time between current pulses flowing through the resonant circuit is variable, depending on the power load requirements. It can be achieved by changing the control frequency in a specified range (86 kHz to 205 kHz - resonant frequency is 150 kHz). power factor correction or reduction of losses in power supplies or efficient standby modes, CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS, Climate change mitigation technologies for sector-wide applications, Efficient use of energy, e.g. Each time the output voltage V3 of AND gate 134 goes high, it clocks a D-type flip-flop 140 in the driver control 30. Introduction & Device Overview 2. In the series resonant converter the output i s connected in series with the resonating elements which are comprised of the resonant inductor and capacitor. Otherwise, no change is made to the magnitude of the error signal. analog-control chip is selected to regulate the output voltage of the LLC resonant converter. This book is devoted to resonant energy conversion in power electronics. 3C. Two resonant converter configurations of third order have been studied namely the LCC-type parallel resonant converter also popularly known as series-parallel resonant converter (SPRC) and the hybrid parallel-series resonant converter ... converter is composed of two parts, a boost converter and a CLL resonant converter. Supply 10 includes a series resonant power converter 20 which receives the unregulated DC voltage from the low-pass filter 18 and provides the regulated DC voltage at output terminal 14. G_dc_min = Minimum value of DC gain required Each pulse has a rise time and fall time dependent on the components in the resonant tank circuit and appears in the form of a sinusoidal pulse. Consequently, as positive going pulses are supplied to the clock input, the Q and Q outputs alternately provide high or binary 1 signals to AND gates 142 and 144. Although a very high starting frequency can effectively suppress the inrush, it will also increase the output current demand of the driving ICs. It is found that using the Steady State Solver tool and the Design Curve tool, K_ind in between 5 to 6 and Q_rated in between 0.3 to 0.4 will give us a narrow range of frequency for voltage regulation with a lower RMS current over a wide range of load for this example. Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims. The converter employs a pair of power switches each, when on, completing a series resonant circuit from the voltage source to a resonant tank circuit including the primary winding of a power transformer coupled to the load. When the voltage V6 goes low, it supplies a second low input to gate 160 to maintain its output voltage V5 high to keep the power switch turned on. If the average current is considered too high for proper usage of the FETS, then the frequency of supplying current pulses through the resonant circuit will be decreased to prevent destruction of the FETS. Reliance Electric Company (Cleveland, OH), 323/235, 323/319, 363/17, 363/17, 363/56, 363/79, 363/80, 363/98, 363/28, 323/235, 323/319. The Power Supply Design Suite in PSIM provides a quick and convenient solution for resonant LLC converter design. Found inside – Page 195CONTROL. OF. THE. SERIES. RESONANT. CONVERTER. A4.1 INTRODUCTION In pulse-width-modulated switch-mode converters, ... The output quantities are regulated by the direct control of the voltage or current applied to the output filter. 2 as being an unregulated DC voltage 50 which is representative of the output of the low-pass filter 18 in FIG. The other important output calculations can be seen at the output parameter in the left bottom panel. 4.2.2 Parallel resonant converter The schematic of parallel resonant converter is shown in Figure 4.4 [B14]-[B17]. Chinese patent literature discloses a kind of LLC controlled resonant converter control method and the device that application number is 200910221471.4, this device judges load condition by input switch pipe turn-on frequency, carry out respectively frequency conversion, adjust wide control according to load condition again, reduced to a certain extent circuit loss, but this frequency conversion adjusts wide control without any constraints, can make the switch tube zero voltage switch of LLC controlled resonant converter and the soft switch environment of rectifying tube Zero Current Switch lose, thereby make the cavity voltage gain uncertain. This flip-flop has its Q output inverted and fed back to the D input thereof so that the flip-flop acts as a divide-by-two counter. Found inside – Page 44Resonant converters can overcome these restrictions by using zero current and/or voltage switching [9]. AC-AC converters are ... This phenomenon makes the control of resonant converters more complex than pulse width modulation (PWM) ... 5D, and thereby remove the enabling input to AND gate 134. Pwm and pfm hy- brid control method for llc resonant converters in high switching frequency operation. The sensed output voltage VO is received by control 28 and is amplified by an amplifier 100, which may suitably take the form of an operational amplifier, with the amplified output then being supplied as a positive input to a summing node 102. This will permit operation even if the resonant current detector circuit fails. The full wave recitified current may take the form as shown by the pulsating waveform in FIG. STNRG011. Consequently at full power, current flows only for 8 microseconds out of a 12 microsecond cycle, or for only 2/3 of a cycle. Found inside – Page 286[36] O. Lucıa, J.M. Burdıo, I. Millán, J. Acero, D. Puyal, Load-adaptive control algorithm of halfbridge series resonant inverter for domestic induction heating, IEEE Trans. Ind. Electron. 56 (8) (2009) 3106–3116. To achieve operation without the FETS 52 and 54 being on at the same time, then the frequency of supplying the current pulses must be held to be somewhat less than that of a maximum resonant frequency FM which is determined by the components of the resonant tank circuit. The Q_rated is 0.3 and K_ind = 6 with the required G_dc = 1.2005. The major objectives of the proposed SMC are to improve the converter dynamics and to achieve a tight output voltage regulation with respect to any parameter variations and external disturbances. This is achieved by first rectifying the AC voltage by means of a full wave bridge rectifier 16 and this rectified voltage is then filtered by a low-pass filter (LPF) 18 providing at the output of the filter an unregulated DC voltage. Introduction Main task of power semiconductor converter is transfer of electrical energy from its input to the output and to the load. This is the final volume in a four-volume series concerning POWER ELEC TRONIC CONVERTERS. The first volume studies AC/DC conversion, the second studies AC/ AC conversion, and the third DC/DC conversion. An additional inductor is incorporated in secondary for resonance . In such case, the variable impedance is continuously varied in its impedance magnitude in order to maintain a constant voltage or current at the load circuit. Resonant converters are usually controlled by variation of switching frequency. This commutation strategy achieves a drastic re- The peak values of the switch current are also provided for proper switch calculation based on power or voltage rating. In a soft-switching converter, switching occurs when voltage and/or current values are zero, thus significantly improving converter's efficiency.

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