TW200843315A - Full-bridge phase shift type series resonance controlling circuit and its method - Google Patents

Abstract

A full-bridge phase shift type series resonance controlling circuit comprises a full-bridge phase shift type series resonance voltage converting circuit, detecting voltage unit and switch controlling unit. The detecting voltage unit collects a voltage from the output of the series resonance voltage converting circuit for the switch controlling unit providing switch controlling signals to control the series resonance voltage converting circuit. The switch controlling signals are used to control the frequency and duty of the switches of the series resonance voltage converting circuit. Therefore, the full-bridge phase shift type series resonance voltage converting circuit can output a stable voltage in the situation of under loading.

Description

200843315 IX. Invention description: [Technical field to which Mingming belongs] - A kind of support vibration control circuit, especially related to Liwangqiao phase shift series spectrum control circuit. [Prior Art] The road diagram of the figure is a conventional full-bridge series resonant converter. The electric-to-vibration converter 1 includes input power, QC, fourth transistor switch QD, and: TQB f factory a switch screen crying T1 tastes exhausted 卯 white vibration inductance LR, resonant capacitor CR, variable ΐ Co: diode D1, second rectifying diode D2 and output parasitic" t = 曰-曰 body (4) has the first body diode DA And the first and second: t-year-two body QB system has a second body diode _ and a viable valley CB, a third transistor qc DC and a third scented emperor six ΓΓ... One pole, butterfly ηη β - Xun CC, Le Siyi crystal system has the fourth body two 々 々 limbs DD and the fourth four parasitic capacitance cd 〇 pole #, 1 = crystal open 汲 _ 接 人 人 电源 电源The source of the grounding transistor QB is infinite, and the source of the second transistor (10) is coupled to the input fine η, := 接 is connected to the fourth transistor QD, and The fourth transistor = = ground. The first transistor switch QA, the second transistor switch 卯, the first: the body switch QC and the fourth transistor switch QD between the pole Received separately: interpole control (four) SA, second closed-pole control signal SB, closed-pole control signal, turn-on and turn-off of the Qing body switch (10). A switch team and the fourth four-crystal resonant capacitor (3) and spectrum vibration and transformer T1-secondary inductance 200843315

Ll · 联, and the end of the resonant inductor CR is connected to a node β between the first electric QA and the second transistor switch QB, and the spectral inductance ι is closed: coupled to the third transistor switch qc With the fourth transistor switch - node A. Transmitting the first transistor switch QA and the second transistor through the first gate control signal SA, the second gate control SB SB, the third gate control signal sc, and the fourth interpole control signal 汕The duty cycle of the switch QB, the third body switch QC and the fourth transistor switch is set to be such that the transistor switch QA and the fourth transistor switch are simultaneously turned on and the second transistor switch QB and the third transistor switch are simultaneously turned on. Q c is turned on and off at the same time, so that a series resonant circuit can be achieved, and the transformer Η can be a 50% positive and negative half cycle voltage waveform. Then, please refer to the second picture, which is the closed side of the switching frequency and the output voltage of the full bridge type series resonance. As shown in the figure, the f-signal can be °°. The bridge-type series resonant converter only adjusts the _ rate and the output voltage when it is heavy-loaded, which is what the general circuit calls the series turtle. However, when the full-bridge series is connected When the vibration converter is lightly loaded, the second diagram shows that the curve of the relationship diagram is very smooth at light load, so it is possible to adjust to the required voltage specification at a non-f high switching frequency. In the past, in order to set the voltage, the on-rate must be adjusted to a very high frequency. Therefore, the switching loss may be too large due to the high switching frequency. On the other hand, the circuit architecture cannot be idling. The required false load is also quite large, which will result in loss of efficiency and cost. Further, 'the impedance of the vibration-increasing cavity is changed by changing the frequency of the input resonators VA, VB', and the resonance impedance generated by the resonance will share the input voltage Vm with the load; therefore, the adjustment of the transmission frequency stabilizes the output voltage. 200843315 [Summary of the Invention] Since the current series resonant circuit is often too high because of the switching frequency, it satisfies the light load/no load condition under light load or even no load. The present invention provides an output circuit, including a full-bridge phase-to-phase phase-shifted series spectrum oscillator, by means of each switching, which can not be used for the above purposes. Switching on and off, , 々搌 turtle sense and a transformer, output voltage; an output voltage detecting unit to achieve series resonance to output a series resonant voltage conversion circuit: Second, coupled to the full bridge phase The shift switch control unit is connected to the second to operate the output voltage; - the shifting series resonant voltage conversion ^= ^ the compacting unit and the output voltage detected by the full bridge phase, the rim, 曰 according to the output The voltage detection unit switches between the _ rate and the target ^ control money to control the insect _ batch board emperor two aunt from the two-point value 'by this to make the full bridge Xiangming + _τ frequency, some = change frequency ^ comparison; Wherein, when the switching switches are cut "at the preset switching frequency, the _ control money element adjusts the opening/changing frequency to the pre-rib changing frequency, and transmits the switches = (4) the « X fairy, sigh the whole age = voltage conversion circuit output Output voltage. PD self-vibration electrical connection i!fi stated, the present invention further provides a full-bridge phase-shifting rate spectroscopy Ί: voltage control method's steps include first providing - full bridge phase series ear vibration voltage conversion circuit, It outputs a output voltage through a plurality of switching modes = 200843315, and then provides a voltage detecting unit to detect the output voltage; and then provides a switching control unit to detect the output voltage according to the voltage detecting unit. Controlling the switches of the full-bridge phase-shifting series resonant voltage conversion circuit; when the full-bridge phase-shifting series resonant voltage conversion circuit operates at a heavy load, the switch control unit adjusts the full-bridge phase-shifted series resonant voltage Converting the frequency of the switches of the circuit to output the output voltage; detecting the frequency of the switches to compare with a preset frequency; and when the frequency of the switches exceeds the preset switching frequency, the switch controls The unit sets the frequency of the switches to the preset switching frequency, and adjusts the working phases of the switches to control the full bridge phase shift series resonant voltage conversion circuit The output voltage is taken out. In order to further understand the techniques, means and functions of the present invention for achieving the intended purpose, refer to the following detailed description of the invention and the accompanying drawings. The present invention is to be understood as being limited and not to limit the invention. [Embodiment] The present invention divides the control feedback mechanism into two types depending on the output load. Modulation mode; when the output is a heavy load, the series resonance characteristic of the circuit is utilized, and the switching frequency of the control circuit corresponds to different switching frequencies due to different output loads, thereby obtaining the same output voltage. For light load, since the switching rate is gradually increased, the maximum switching frequency of the circuit will be limited on the circuit. If the output voltage is still high, another feedback signal will be generated to the compensator, 'trigger another type. The mechanism of the mechanism is to use the phase shift ratio of the circuit to generate positive and negative half cycles of less than 50%, and then pass through the turns ratio of the transformer. Output Regulations to Circuit Requirements 9 200843315 That is, the circuit operates its switching frequency at the duty cycle at light load, :::: The characteristic of the full bridge phase shift controls its output specifications, and the other side 2 Make its circuit get good circuit when it is light load...^ It is also quite easy to complete in the no-load of the circuit. For the road shirt, you only need to add a lw dummy load.烕 r Control unit:: Construction = = = Ming full bridge phase shift series spectrum phase Includes full bridge phase series diagram. Wangqiao phase-shifting series resonance control circuit 2 μ and switch control unit factory voltage conversion circuit 21, voltage_unit type series age voltage detection unit 22 is to draw the full bridge phase control unit] 3 firm, two road 21 The wheel voltage ν〇 is turned back to the switch control signal changing circuit 21. The full-bridge phase-shifting series riding electric ink switch control unit 23; _, ^ type series spectral voltage conversion circuit 21 is connected to blow, the full-bridge phase-shifting series of the load state V is included + source Vin, the first - The transistor switch circuit 21 includes a turn-in transistor switch Q3 and a fourth transistor: 'off, third capacitor CR, transformer T2, m-khan' Q4, insect oscillator LR, resonant power (10), and turn-off capacitor c The second body D1, the second rectifying diode m and the first-parasitic capacitance ^1 crystal milk system have a first body bulk implant. The polar body D2 and the second parasitic capacitance ^^ crystal system have a second body two body The diode D3 and the third female body ♦ two music diode Q3 have a third body four body diode D4 and a fourth power crystal to have a second harmonic capacitance C4. , a transistor switch Q] is connected to the second transistor Q2: and 桎: Ϊ input power Vin, its source and pole, and the source of the second transistor Q2 10 200843315: ground. The third transistor switch (10) is lightly connected to the input power supply shirt, and the hybrid is connected to the fourth electronic crystal, and the source of the fourth transistor Q4 is grounded. The first transistor switch Q1, the second transistor switch, the second crystal switch Q3, and the fourth transistor switch Q4 (4) (4) The first switch control signal, the second switch control signal edge, the second change The switch control signal S3 and the fourth switch off control signal are used to control the turn-on and turn-off of the Q3 and the fourth transistor switch q4. , vibrating electricity (four) system and resonant inductor LR and transformer T2 - secondary side inductance) ^ white vibration inductance (3) - the end is coupled to the first - transistor switch, di Guangdian crystal f switch Q2 - node _ Chen fine - 糸 ^ 祸 接 接 接 接 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二 二_Private compression early 70 22 series connected to the output end of the full-bridge phase-shifting series spectrum voltage voltage circuit, taking the output voltage %; and then taking the voltage, Vo, which is taken, to the open_23, for The switch control unit 23 adjusts the switch control signals Sr, S2, S3, and S4 to control the output voltage ν 全 of the full-bridge phase shift type string-vibration conversion circuit 21. The switch control unit it 23 facilitates the use of the frequency control unit 231 and the phase control unit 233 to control the output of the switch control signal 81, the slave, and the 33 according to the output voltage V〇 measured by the voltage sensing unit 22. The switching frequency and the working phase of the transistor-transistor_, the second transistor switch Q2, the third transistor switch, and the fourth transistor (4)4. When the full, phase-shifting (four) ft-oscillation voltage conversion circuit 21 operates at the output heavy load, the first-electro-strictor switch Q, the second transistor switch Q2, the third transistor switch Q3, and the fourth transistor switch Q4 are The duty cycle is set to (10), the first power 11 200843315 crystal switch Ql and μ transistor switch Q2 Π transistor switch Q4 are simultaneously turned on and off, the second transformer T2 can be; the second transistor is turned on (4) Q3 is simultaneously turned on and off, then Obtaining the loss of each degree is 5 positive and negative half cycles, and then through the number ratio and S rate transistor open _, Q2, Q3, and the working phase series resonance surface turn #振之之性' to make the full bridge phase shift Voltage Vo. The electric conversion circuit 21 can still be turned out under heavy load; the output is switched out, and in order to avoid the light load, the circuit is turned on and the private symmetry resonance voltage conversion circuit 21 is large, and the present (4) high switching Fresh, exhaustive switching loss over seven, a modulation mechanism to stabilize the output voltage v〇. Switch Q3 and fourth power::. ::曰:, the effect of closing Q2, the third transistor voltage. And η:; ^ Λ change ¥, to achieve stable output 232 detection full strict phase two: system early 23 series utilization - frequency detection unit rate: and frequency detection unit 232 is equipped with a pre-Γ ^ ^;;: Γ ';1ΐ ° If the frequency & test list 7 " 232 detection full bridge phase shift type ear " white vibration switching circuit 21 switching frequency exceeds the preset switching frequency, but failed to stabilize (four) out voltage VQ , the frequency switching unit 231 is notified to set the switching frequency of the first transistor switch Q1, the third transistor off Q2, the third transistor switch Q3, and the fourth transistor switch q4 to a preset switching frequency; The phase control unit 233 utilizes the characteristics of the full bridge phase shift to adjust the working phases of the first transistor switch Q1, the second transistor switch Q2, the third transistor switch Q3, and the fourth transistor switch, thereby completing the full bridge phase. ^式12 200843315 The series resonant voltage conversion circuit 2 can obtain good output specifications at light loads. By the above working mode, the full-bridge phase-shifting series resonant voltage conversion circuit 2, at light load, the first transistor switch Q1, the second transistor switch Q2, the third transistor switch Q3, and the fourth transistor switch Q4 will have a dead-time between the switches, so the zero-voltage switching condition of the circuit can be easily reached, so the efficiency of the circuit at light load will be higher than that of the general circuit. The fourth figure is a relationship diagram between the current waveform and the switch control signal of the full-bridge phase-shifting series resonant voltage conversion circuit of the present invention at light load, which is a current waveform ip of the transformer T2 - the secondary side inductor L21 when the circuit is lightly loaded. And each switch control signal SI, S2, S3, S4, respectively, describes each working state. 1 · Energy transmission interval.) The third transistor switch Q3 and the second transistor switch Q2 in this interval are turned on, and the output current is The third transistor switch Q3 and the second transistor switch Q2 continue to flow in the forward direction. At this time, the secondary rectifying diode D1 for output rectification of the secondary side of the transformer T2 is turned on, and the second rectifying diode D2 is turned off. At this time, the energy is transmitted to the secondary side via the transformer T2 - the secondary side, and the output capacitor is output. Co is charged, so this interval is defined as the energy transfer interval. 2. First resonance interval (, 2 < α3) Sound * > * At t = t2, the third transistor switch Q3 is turned off, and the primary side current ip 睿 stops rising. According to Lenz's law, the current of the inductor must remain connected. The current on the resonant inductor LR continues to flow in the same direction. At this time, the current 13 200843315 charges the third parasitic capacitor C3, and discharges the fourth parasitic capacitor C4 until the voltage across the third parasitic capacitor C3. To Vin, the voltage across the fourth parasitic capacitor C4 is set to zero. The fourth body diode D4 is turned on. At this time, t=t3 ' can be regarded as the equivalent resonant inductor and the equivalent resonant capacitor Crl. The resonant capacitor Crl is composed of a third parasitic capacitor C3, a fourth parasitic capacitor C4, and a resonant capacitor CR. In this interval, the energy is transmitted to the secondary side through the primary side, and the first rectifying diode D1 can be kept turned on, and the second rectifying diode D2 is kept turned off, so that the output capacitor Co continues to be charged. In this interval, we can subdivide into two stages of charging and discharging of resonant inductor LR. When it is greater than |, the spectral inductance LR is charged and increased. When %W is less than 匕, the resonant inductor LR discharges and ζ» decreases.

N 3 · linear discharge interval 〇3 yq ) After the first resonance interval ends, the fourth transistor switch Q4 is turned on again, and the fourth transistor switch Q4 is turned on again, so zero voltage switching can be reduced. Switching loss, node A and node B are grounded via the fourth transistor switch Q4 and the second transistor switch Q2, respectively, and the resonant inductor LR linearly releases energy to the secondary side via the transformer T2. We define this region as a linear discharge. Area. 4 · Di two resonance interval (ί4 ^ ί < ί5) The second resonance state starts from the second transistor switch Q2 cutoff 14 200843315 (t two t4), at this time zp (,) life ^, the first parasitic capacitance The two parasitic capacitances (2) charge 'and the first parasitic power, the second parasitic electricity = charge one L ^ ^ α to take C1 discharge to zero, and the first transistor switches Q1, ^^ Dl are turned on to complete the impurity. In this interval, due to: the private side of the dead side::〆'): sufficient to provide the energy required for the secondary side, so the first-pole group second rectifying diode D2 is in the state of the flywheel (Free-Wheeling) : λ ^ Lenz's law, the current must be Τ2 as if the short-circuit effect 'according to the second rectifying diode m continuity, 0 the first rectifying diode di output voltage V 〇 · 1 · is simultaneously turned on, The output capacitance Co is maintained at the resonant inductance Lr) 'years old', [as the temple effect resonant inductor Lr 2 (the first parasitic capacitance cf, etc. / the resonant capacitor Cr2 resonance, which is formed by the second resonance region ^Two parasitic capacitance C2 and resonant capacitor CR are set down. When the political score is reached, the voltage of node A will be its maximum value in sine wave mode. When the resonance period Tres, the sine wave voltage will reach here. The interval, in order to satisfy the ^, the rear switch can reach zero voltage conduction, must be 2", CRxV.2 2 (7)' in order to ensure that all stored in the resonance month is sufficient to charge / discharge the resonant capacitor Cr, the first transistor The dead zone between switch Q2 must be set to P (mi„) > energy body switch Q1 on inductor lr Qe of t '2

Cr II c XFMR c 3 . Rong. {%/, where resonance. Equivalent electric solution is the equivalent of electricity between the primary winding of the voltage regulator. 15 200843315 5· Turning interval (after the second miscellaneous, in the fourth body, the second bell can be put The first transistor switch Q1 is turned on, and the switching after + is zero voltage switching. In the =Λ "the voltage of the body of the body switch 91 (10) is fixed to _LR, the linearity is reduced, and the correction is _Wei_ difficult to cut Equal to the current reflected from the output inductance of the second side, the transformer T2 resumes the function of the escape, and enters the energy of the second side of the energy transfer to the secondary side, so that the first-complex The pole body m is turned on, and then the output capacitor c is turned on because the current φ flows in the opposite direction, so the interval between the half cycle of the zone and the half cycle of the above is defined, and the other is not described again. Next, please refer to the fifth figure, which is a flow chart of the steps of the output voltage control method of the full bridge phase shift of the present invention. The first type string is like #振移式串_振电(四)(四)路21, the handle ^=^全=phase Q2 The switching of Q3 and Q4 forms a series resonant spectrum of the inductor and capacitor, and the output voltage Vo (as in the fifth step, the dip is 1). The output unit voltage 22 is used to detect the output voltage v〇' for switching control; and the single-shift series resonant voltage conversion circuit 21 is tested (for example, the second bridge phase control switch unit 23 according to the voltage detection unit returns = S503). The voltage control controls the opening, Q2, Q3, and Q4 (if the output power detected by ^ is the full bridge berth series resonant voltage conversion circuit ^ step S505). The control unit .23 side is used to solve the financial element In the domain, the H Q3, _ rate is turned on so that the switch circuit 21 stabilizes the output voltage, such as the fifth step, 16, 200843315, the detection unit 23, 23, the 04 sweat frequency of the switches n, ' Switch control ==: phase shift r yuan 233 intensively on the basis of (2) people's hometown S511) 〇 principle, Sheming system through the feedback mechanism to match the iL switch to perform zero voltage switching, down = phase shift control error This solves the conventional string _ control off switching loss, the object: ί 'only for the present invention: ΐ:: Γ missing. : ί林 invention implementation age is: two cases, not equal changes and Modifications are all for the purpose of the invention and the scope of patents is sought for by the scope of the patent. [Simplified illustration] The second diagram of the full bridge type series is a circuit diagram of the full bridge type series vibration conversion ^; the relationship diagram of the voltage; the switching frequency and the third diagram of the wheel is the circuit structure of the full bridge phase shift type of the invention Figure; A, such as the resonant phase control unit, the voltage and voltage conversion circuit, and the output of the bending vibration, the electric four-phase system is the full-bridge phase-shifting series furnace of the present invention. ★ Compared with the light load, the current waveform and the switch control signal sharp relationship ^ 4 The figure is a flow chart of the steps of the full bridge phase shifting enthalpy control method of the present invention. Ear outside 17 200843315 [Description of main component symbols] [Authentic] Input power supply Ήη

First transistor switch QA first body diode DA first parasitic capacitance CA

Second transistor switch QB Second body diode DB Second parasitic capacitor CB Resonant inductor LR 'Resonant capacitor CR Transformer Τ1 Primary side inductor L1 First rectifying diode D1 Second rectifying diode D2 Output capacitor Co ' Three transistor switch QC output voltage V〇

Third body diode DC third parasitic capacitance CC

Fourth transistor switch QD fourth body diode DD

First gate control signal SA second gate control signal SB third gate control signal SC fourth gate control signal SD

Fourth parasitic capacitance CD

[Invention] Full-bridge phase-shifting series resonance control circuit 2 Full-bridge phase-shifting series resonance voltage conversion circuit 21 Voltage detecting unit 22 Switching control unit 23, . Frequency control unit 231 * Frequency detecting unit 232 Phase control unit 233 Current ip 18 200843315 Node voltage Vab Input power V i η Resonant inductance LR First transistor switch Q1 Resonant capacitor CR First body diode D1 Transformer T2 First parasitic capacitor C1 Primary side inductor L21 Second transistor switch Q2 A rectifying diode D1 second body diode D2 second rectifying diode D2 second parasitic capacitor C2 output capacitor Co third t crystal switch Q3 output voltage Vo' third body diode D3 first switching switch control Signal S1 third parasitic capacitance C3 second switching switch control signal S2 fourth transistor switch Q4 third switching switch control signal S3 fourth body diode D4 fourth parasitic capacitance C4 fourth switching switch control signal S4 19

Claims (1)

200843315 X. Patent application scope: Bu-type full-bridge phase-shifting string_vibration control circuit,-full-bridge phase-shifting string-riding voltage conversion conversion. Switch, a resonant capacitor, a cymbal, a series of multiple switches Na's conduction and cutoff 咱 = and - transformer, by each voltage; violates series resonance to output a loss.% An output power _ measuring unit, is missing (four) voltage conversion circuit output, with bridge phase shift The serial resonant electric house conversion circuit gate earth /, the early and the detection unit detects the output voltage, the round output = the output power of the output signal to control the switching control of the switch The bridge phase shifting series spectrum is electrically connected, and the voltage is borrowed; and the 彳 and 甩 roads take out the round-fresh _ unit, and the system is provided with a set of early reduction elements to measure the switching of the switches. Frequency and the preset switching frequency: the switching rate is higher than the two-way switching switch _ preset ON = if the threshold control signal is used to control the secret switching:::y. to make the full bridge phase shifting String, both vibrating _ Xia circuit output the wheel voltage. · $. ^Application for the special Wei _ 丨 之 之 全 胄 胄 胄 胄 胄 胄 胄 胄 胄 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关 开关3. Switching frequency of 阙... == Range The full-bridge phase-shifting series vibration control two-switch control unit described in item 1 further includes - phase control unit 2, and the working phase of the switching switches. Repeatedly: change the R-head control early 70 series control the switch to perform zero 5, i °: please: = two = the full bridge depends on the resonant power for the full-bridge phase-shifting series 6, r Full-bridge phase-shifting series resonance output power repeated control method, step package 2 2=2: Spectral voltage conversion circuit 'passing through multiple 趄: detecting early detection of the wheel voltage; μ, - switch control unit according to The electric=the full-bridge phase-shifting braiding electric=When the two-conversion circuit works _ the pressure-switching t-path secret opening==phase-shifting series, please vibrate to detect the Haifa & The turn-off voltage; when the frequency of the switches, the preset switching frequency are compared, and the elements are opened: ::= switching frequency 'the switch control list: some open working phase, frequency, and Adjusting the A & the full bridge phase shifting series resonant power 200843315 voltage conversion circuit outputs the output voltage. 7. The output voltage control method for full-bridge phase-shifting series resonance according to claim 6, wherein the switch control unit adjusts a working phase of the switches by using a phase control and a unit, so that the switching switches are executed. Zero voltage switching. 8. The output voltage control method for full-bridge phase-shifted series resonance according to claim 7, wherein the phase control unit controls the switching of the switch to perform zero voltage switching. 9. The output voltage control method for full-bridge phase-shifted series resonance according to claim 6 of the patent application scope, wherein the switch control unit adjusts the frequencies of the switches by using a frequency control unit. 10. The output voltage control method for full-bridge phase-shifting series resonance according to claim 6, wherein the frequency of the switches is detected by a frequency detecting unit to perform with the preset switching frequency. Comparison. twenty two