TWI330926B - Llc series resonant converter output voltage regulation apparatus with automatic frequency-shifting technique - Google Patents

Description

1330926 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a linear high-resonance power supply for a linear series resonant converter (LLC-SRC). . Heart & [Previous Technology] Pulse Width Modulation (PWM) is currently used in power electronic control, in order to achieve thin, short and high efficiency. Many new circuit architectures are available. Towards the direction of increasing the frequency of work. However, the frequency of the operation will increase the number of switching of power components per unit time. == The cost is that switching loss (SwitchingLosses) and electromagnetic interference (EMI) become larger. In order to understand the above problems, there have been quite a lot of techniques for miscellaneous conversion H that have been proposed to improve: and reliability, while achieving small, lightweight and reduced £;]^11/{^1 Converter (Series Reso Fine Converter, SRC), parallel resonant converter 4 famllel Resonant Converter (PRC) and series-parallel resonant converter ^ = r = onverter). The series spectral converter maintains high efficiency at light loads. The voltage regulation is poor and there is a high output current ripple. ί联土振转换 Jay has a narrow frequency variation range / low can be applied to a wide range of input relays: Voltage simple 'wider load range zero converter has quite superior characteristics although ^LLC series spectrum The vibration is turned into a fx circuit, and the analysis and control (4) is very 设计 ϊ 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 属于 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本The circuit makes the LLC series harmonic output stable, except that the complexity of the control can be simplified and the 1330926 is improved. In the embodiment, the converter is also proved to be in the full load range. [Inventive content] It is shown as the LLC of the present invention. System architecture, divided into m 2 composition, switching off 32 of 1 Can 2 crystal composition, voltage divider capacitor κΐ^ΐί-symmetric, high-frequency inverter, DC input power supply 3 cut. The high-frequency exchange money is constructed by the isolator and the capacitor c" constitutes the Wei network to generate the spectrum. The second === circuit 36 r is replaced by the straight specification. The jade and the money about the 2nd and 2nd Γ are analyzed as follows: Equation: as shown in Figure 2(8), when, =,. , switch open _ and second line 2 plus. In this mode of operation, the 'drain slave' and capacitor Q are terminated. A sine wave current. When the switch 2ι is turned off, this working mode?) working mode II (w is called: as shown in Fig. 2(b), the current contains two poles of vibration, and the period of vibration (/>Λ) When ta is cut off, the spectrum is passed. At this time, the current of the chick is reduced, so that the secondary side rectifying diode continues to be replaced by the zero-power i-conductor; when the second is 2, the switching switch a-cut rectifying diode A is cut off. Time, 夂 'secondary side · secondary side (4) working mode 1W called): as shown in Figure 2 (d), when, . When the amount of red is less than the excitation current, the secondary side rectifies linearly and the magnetizing inductance 4 is clamped at both ends by a voltage. The magnetoelectric force will discharge: n / r. This interval leakage inductance 4 resonates with the capacitance Q. When the switch (4) cuts the cylinder to the wire. S for ϊί二('4<,/5): as shown in Figure 2(e), 'When the call' toggle switch & cut-off voltage cut Ϊϊ ι ί ί toggle switch, contains the diode (bGdy diQde) to generate zero The itch is found, the leakage inductance of the 匕 interval is resonating with the capacitor Q, the secondary diode is 2 temples, and the shell is kept conducting, and the resonant current is rapidly decreased. (P working mode νι〇5 When 丨, the switching switch Q is switched to zero voltage conduction, = the secondary side diode z> 2 remains conductive. When called, Bu &, the secondary side rectifying diode A is cut off. After the end of the working mode, the next cycle begins. B_DC characteristic analysis In order to discuss the DC characteristics of the circuit, the AC equivalent circuit needs to be analyzed first. Assuming that the LLC series resonant converter mentioned in the present invention has a high q value, the LLC resonant network The resonant current in the current will approximate the sine wave'. Therefore, the fundamental network can be analyzed by Fundamental Component Simplification (FES). The AC equivalent circuit is shown in Figure 3. From Figure 3, the AC can be derived. The AC voltage gain is as follows

KJIH__ jwLr+jaRac//j〇Lm

(1) (2) wherein the invention defines

2π4ϊ^Γ (3) 1330926

Q

π

A (4) If the output square wave of the inverter is expanded by using the Fourier series, the fundamental wave is taken and the wave components are ignored. Then the basic wave maximum is as follows: (5) (6) r 4 1 2 Εκ^)=~- ~νίη=-νίη π ^ π The effective value can be written as follows: The fundamental wave RMS of the primary side of the transformer is as follows (7) Therefore, the DC voltage gain of the LLC series resonant converter (dc v〇k can be derived from equations (5)-(7) (8)-(9): Heart-.

Vin 2n Ein 2n

G ac (8)

Gdc 2n [l + /ox ^2 q,:7).i] (9) Figure 4 shows the circuit gain versus switching = different 2 values for steel according to equation (9). The load of 3 amps in the Q value of 6 frequency and the ability to work ^I eye f mine f principle is to make the switching frequency of the power crystal as far away as possible from the spectral point: the overall decline: Figure 4 shows that when the circuit switching frequency 1 In the adoption of the self-rate is low / τ ^ this age, the present invention in the graph characteristics to complete the output power is willing to return to (4) A Q c series spectrum converter action and converted to controller feedback: signal;, m features The controller will reduce the switching frequency by the _ output power controller, and the invention is improved when the field is heavily loaded (high current). The overall control strategy is to operate the switching frequency (small current) controller to raise the frequency of the switching frequency. Chest (Zero Voltage plus extinguish in ^ = Fan = converters have zero power rate. When the load is operating in heavy load, the system is crying needs to be ^ ^ month ^ amplitude boost circuit conversion effect Μ series _ provide dynamic control ^ control The device must increase the switching frequency to make the transmission "3 drop U change: the operation is to make the switching frequency automatically shift and adjust the output voltage to "η. That is the system realized by the lion self-touch technology of the present invention. , the unit block f private λ button circuit 1, back to the road 2 and the coffee series miscellaneous conversion piano 3, and into. Therefore, the focus of each part of the hair duck system is given. '. 振荡. Oscillation circuit vibration Wei Road contains - current (four) solution (four) E u (c_t (five) such as coffee ^equency 〇Scillator, CCF 〇) and pulse width modulation generator called卩side enerator). The current controlled frequency oscillator produces a variable frequency mineral tooth wave and provides it to the pulse width modulation generator. The pulse width modulation generator is a well-known technique, and the main tooth is compared with the - reference voltage level to output the pwM ^' The load changes and goes to the sawtooth input of the PWM generator to change the PWM output frequency. The gastric signal is inverted to output two sets of inverted pulse width modulation signals 13, 14. The two sets of pulse width modulation signals will pass through the dead time circuit 15 (Dead time drcuit) to produce a suitable dead time. The signal is sent to the switch drive circuit 16. The drive circuit is mainly for power isolation and has sufficient current to switch the power switch elements. 1330926 FIG. 7 is an embodiment of a current controlled frequency oscillator 11, which has the advantages of simple circuit, low cost, and wide frequency range. It works by using a comparator. The constant current generated by the power supply ί 5 plus the feedback current component z/ is charged to the capacitor c. After the sawtooth wave signal on the electric grid device C is sent to the pulse width modulation generator, it becomes a wide range of _ fresh vibration ill. Figure 8 shows the schematic diagram of the sub-sections ^, , and a in the load deuteration range I. As is clear from Fig. 8, the LLC series vibration converter output voltage is feedback processing to generate a feedback voltage 々. * The post feedback voltage is converted to a corresponding /7 by a voltage/Current converted circuit to charge the capacitor. When the voltage is at a lower level, the charging current (smaller, so the switching frequency of β: i (9 〇 KHZ). When the 々 voltage changes to a higher level, the ζ / component also increases The electric current & becomes larger, and the switching frequency of Q gradually increases to i (1〇2KHz). Among them, the charging current can be as shown in equation (10): (10)

h - h + V

The resulting capacitor voltage V + /

C

C (Π) and the state of charge on capacitor C can be analyzed as follows: Mode 1: Positive slope charge state (/L~/&quot;) In addition to the constant current generated by the original ^, the feedback current is also injected into the capacitor c charging. In this mode, 々 is raised by the low potential, and the corresponding current is always increased. Therefore, the switching frequency quickly deviates from the original operation and changes to A. Therefore, in this (4) system will quickly increase the output power voltage and stabilize the requirements of the specifications. (4) Material rise 'Enable transmission mode 2: Negative slope variable current charging state (△~yj f This mode is decremented by high potential drop ^. Therefore, the switching frequency of the total current system is thus rapidly deviated from the original operating frequency, and gradually becomes 1330926 Λ 所以 所以 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 A stable switching frequency is generated by the modulation capacitor. When %, the current control frequency oscillator will output 2RC\n(\ + ^l (12) feedback to obtain the fresh offset / have the following relationship: f' ^Os+ly)' From (12) The value will be ^ (13) The effect is the time constant ^This, this field 7; when the value is too large, the range of the frequency modulation will be limited. 回. Feedback network 2: voltage , and it will increase. The feedback network can be used in addition to the second temple = the lower: because the output voltage is through the sampling resistor network == to;; the amplification of the benefits of the input end of the @@ this reference Under the conditions of electricity and finance, changing the partial pressure = can change the output of the sculpt. In addition, ~ with the variable electric 2 constitutes the network, change ~ The value can adjust the output voltage to the voltage division ratio when controlling the weaving path, and then adjust the output voltage. C. The dead zone circuit 15 and the switch drive circuit 16 send the mineral tooth wave signal to the pulse width modulation generator, Comparing the two sets of pulse wave 1330926 width modulation shouting 'the function of generating the appropriate dead circuit 16 through the leg circuit 15 is to provide sufficient power to push the force and also have the function of isolation. Mode: The invention adopts the analyzed linear series resonance conversion of the linear filament 1 as the high-shock-type electric hybrid (10) (four)' and the experimental waveform is shown in Fig. 10. The advantages from Fig. 1 . In addition, when the load changes from half load to heavy load, the control strategy is correct. The conversion ^ meets the requirements of the specification, and verifies the output voltage waveform of the UA of the changed production and the brother change. If the condition of 'output light voltage regulation is still in the efficiency curve of ± 5% 2 researcher, the most efficient in the full working load range. And Figure 13 shows the LLC series hybrid conversion developed by the invention. The core of the text is deep, and it is used in the market. Related products and pre-ordered ? Find a special request, please ask for details. Ruifa proposes a special fund, please ask for a review. I Changchang, a spouse worker, 4, and also a long-term team, staying up late, looking for a magazine, please The iri iri patent "to ensure the rights and interests of the applicant. However, the present invention is only a preferred embodiment of the present invention, and the invention of the invention is not limited thereto. Ξ ί ί Γ 等效 等效 等效 等效 等效 等效 等效 等效 等效Covered in this [simplified description] system architecture of f1 LLC series resonant converter 2 circuit operation mode of LLC series resonant converter series tilting oscillator converter ^ < Figure 2 (b) LLC series resonant converter Guard mode (5) Κ ί 联 谐振 谐振 谐振 谐振 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 LLC series spectrum converter ' (: 5 Figure 3 AC equivalent circuit t5 &lt; t &lt; t, the system block diagram achieved = diagram of the load variation range Figure 9 feedback regulator ί 谐振 resonance conversion 11 half load Experimental waveform ϋ _ converter full-load experimental waveform Figure 11 output voltage with load variation waveform Figure 12 conversion efficiency Figure 13 Developed LLC series resonant converter Table 1 circuit specification ° [Main component symbol description] 1: Oscillation and drive circuit 11: Current control frequency oscillator 12: Pulse width modulation generator 13: Group 1 pwm 14: 2 sets of pwm 15: dead zone circuit 16: switch drive circuit 2: feedback network 21: electric bunker to current conversion circuit 22: feedback regulator 3: LLC series resonant converter 30: input voltage 31: voltage dividing capacitor 32 ·Switch 33: Resonant capacitor 34: Integrated magnetic element 35: Rectifier diode 36: Filter circuit 37 · Automatic frequency offset controller

Claims (1)

1330926 X. Patent application scope: A DC input power supply is used to provide a stable DC voltage. The input frequency of the ΐ ΐ frequency inverter is electrically connected to the DC input power supply, and the two sets of driving signals are sent to Converting the stable DC voltage into a stable high-frequency AC voltage in the form of a square wave; - a 'the input end is electrically connected to the - symmetrical half-bridge high-frequency commutation benefit: "Stable wave form of stable high-frequency AC The voltage is converted into a stable high-frequency AC voltage in the form of a sine wave; a rectifying and filtering circuit includes a pair of rectifying diodes and a resistor that extinguishes its output terminal and is connected to the load to stabilize the high-frequency voltage in the form of a wave Converted to a stable DC voltage, and then output to the load; a feedback regulator, whose input is electrically connected to the load, to obtain the DC voltage of the load 'and obtain a voltage signal of a suitable level; a current conversion circuit, the input end of which is electrically connected to the feedback regulator to convert the voltage signal of the appropriate level into a current signal of a suitable level; 11 a current control frequency oscillation The circuit is electrically connected to the voltage-to-current conversion circuit, and includes a comparator. The comparator negative terminal is respectively connected with a resistor to the ground and the comparator output terminal. The comparator positive terminal is respectively connected to the capacitor and grounded and connected. a resistor to the output of the comparator, the current control frequency oscillating circuit receives the current signal of the appropriate voltage generated by the voltage to the current conversion circuit, and generates a stable switching frequency oscillation signal; a pulse width modulation generator, The sawtooth input terminal is electrically connected to the positive terminal of the comparator of the current control frequency oscillating circuit, and the output is two sets of inverted pulse width modulation signals; a dead zone circuit 'the input end is electrically connected to the pulse width modulation generation The device is configured to shift the two sets of inverted pulse width modulation signals to generate a two-group driving signal for driving the symmetric half-bridge high-frequency inverter. 2. The conversion device according to claim 1 The half bridge type high frequency inverter includes a pair of upper and lower arm switching switches and a pair of voltage dividing capacitors, and the voltage dividing capacitor is connected in parallel with the switching opening 1330926, and the two ends are connected in parallel. Connected to a DC input power supply, the switch is controlled by a group drive signal of a pulse width modulation signal. 3. The conversion device of claim 1, wherein the integrated magnetic component comprises an isolation transformer and an isolation transformer. The input end of the side is connected to the connection of the two switching switches via a capacitor, and the other end is connected to the junction of the two-divided capacitor. For example, the conversion device of the third application of the patent application, wherein the isolation transformer is rotated twice The two end terminals are respectively connected to the positive terminal of the rectifying diode, and the negative ends of the two rectifying diodes are connected to one end of the resistor-capacitor filter circuit; the middle tap of the isolation transformer is connected to the other end of the resistor-capacitor filter circuit. In the fine conversion device of the first item, the adjustment device comprises: the lightning resistor consists of a solid resistor and a variable resistor, and the divided pendant reaches the error amplifier to be converted into the required feedback voltage. 6: The conversion device according to the first item of the patent scope, wherein the voltage to the production voltage is converted into a current signal 'to send the current to control the frequency of the vibration of the electrical and electrical frequency. 8. If the special _ delete two production 4 Two =,, 5 signals ° Comparison of frequency vibration ship roads ^ The reading device "where the current is controlled to the positive terminal of the comparator | | charging ^ constant current ' this constant current and feedback current tooth wave signal. The published feedback current size produces mines of different frequencies