TWM346217U - Fly back converting device having single-stage power factor correction circuit - Google Patents

Description

M346217 VIII. New Description·· 【New Technical Fields】 n ΐ(5) is a kind of single-stage power factor correction circuit for back-off, especially, especially in the field of power electronics, and the factors and output power are quickly adjusted. The return-to-back conversion device. . Li Yang [formerly known as the street] Currently widely used (four) power factor correction circuit is the traditional positive technology 'but its circuit components are more, the cost is higher, and the road is not noisy' is not applicable to the middle ^ gentleman Xuan Ri x ^, Qian Qian Mai Ji. In order to reduce the cost of the two-stage power factor, in recent years, a variety of single-stage power factor nr discontinuous conduction modes have been proposed, which automatically realize power factor correction = ',, and only the input input wheel power balance, while ensuring the protection of the power supply. Protection: Ancient needs a low frequency capacitor to store energy. Since the input current does not have two rounded current ripples, it is necessary to add: interference suppression circuit at the input end, and the whole circuit is more complicated. In the material level (four) number correction circuit, through the single circuit The same is true for the correction of the input current waveform, the electrical isolation, and the fast output _. Since the control of the storage capacitor 传统 is removed in the traditional two-stage mode, it is necessary to ensure that the above functions are The capacitor house is within the proper range (usually below 400v). Most of the single-stage circuits consist of an input section similar to the booster (Booster), and a forward converter or a reverse converter. Converting the DC/DC part of the Flyback Converter. Generally, the single-stage circuit is not as good as the two-stage power M346217 in terms of power factor and Gu wave content. Usually the power factor (PF) is between 0 8 and 0.95. The wave content (thd) is in the range of 20 to 75%. As shown in the first figure, it is the US patent "AC/DC Flyback Converter" filed by M. Jonanovic and L. Huber (patent number: J| .S)Pat. No.6 , 950, 319), proposes a simple, low-cost, high-efficiency and good-rounding characteristic of a flyback converter with a single-stage power factor correction circuit. In the first figure, two rectified diodes The body (10), D4, and the transformer τΓ are connected between the center taps of the primary windings N1 and N2, and the inductor H' is calibrated by the filter circuit 110 to achieve the correction of the input current, π, and the other two. The rectifying diodes w and (10) are passed through the EMI filter circuit 110, and the input voltage is formed when the thunderbolt of the hall capacitors falls below the input voltage Vin. The second charging circuit of the capacitor C1 is And can reduce the input current; , , , , Wenbo. The storage inductor Lppc and the rectifying diode D3, D4 cry

Tr's primary winding N1, N2 intermediate 拙 y ′, soil 00 electric Xuan 〇 甲 抽 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联 串联For a range of input voltage Vin's f-storage capacitor voltage can be maintained below 4 〇〇V. 7 候 = test the first picture 'When the switch Q1 is turned on (turn〇n): the primary winding N2 of the history transformer Tr is connected with the energy storage inductor w: 1, the primary winding, the group N2 can feed back the energy storage The capacitor is:: the rising slope of the inductor ceramic flow, _ "the voltage value of 丨C1. In addition, when switching the primary winding N1 ▲ of the valley thief Tr; "=rn〇ff), the windings are changed Dancing crying Tr female (four) ^ b Inductive W phase series, primary and n human side side of the output of the reflected electricity, can increase the storage M346217 energy inductance Lm: current drop slope, and thus inhibit the voltage value of the storage capacitor a. Regardless of whether the switch Q1 is turned on or off, the voltage of the capacitor C1 can be suppressed by the induced voltage of the primary windings N1 and N2 of the transformer Tr. 丨 储 储 匕 参考 参考 第 第 第 , , , , , , , , , input power house... The excitation energy of the transformer Tr can be increased by the primary winding N2. When the switch Q1 is turned off, the stored energy of the energy storage inductor Lppc> is directly transmitted to the secondary side of the transformer Tr through the shoulder winding N1. Can increase the efficiency of the entire converter. Optimized The ratio of the windings is to improve the performance of the whole converter, and to optimize the power factor, storage voltage and efficiency. Jade π, text, and later early-stage topology, and the number of polar bodies In order to reduce the guidance of the uncle, the second "efficiency" in the mouth of the two in the mouth. However, when the current is switched, the current flowing through the primary 1 and the primary winding are switched off, thereby causing a large current. And in the I ίπ 1 ^ 5 N2 ^ switch Q1, the stagnation of the Jinji 曰 is under pressure, thus increasing the switching loss between the switching gates ^% causing a large spike s switching 阙w. [New content] In view of this, the switch-to-peach converter of your own circuit should have the advantages of single-stage power factor correction and high efficiency. , 糸 /, 鬲 power factor, low conduction loss loss created by the single-stage power factor correction circuit of the flyback conversion M346217 device, including a first rectifier, a storage capacitor, a second rectifier, an energy storage Inductor, a switch and a transformer. The first rectifier rectifies an input AC voltage to generate a first full-wave DC voltage. The storage capacitor is coupled between the first rectifier and a ground, and filters the first full-wave DC voltage. The second rectifier rectifies the input AC voltage to produce a second full-wave DC voltage. The energy storage inductor is coupled to the second rectifier to store the second full-wave DC voltage. The switch is coupled to the ground. The transformer has a primary winding, a secondary winding and a coupled winding, wherein the primary winding is coupled in parallel with the switching-on relationship to the energy storage capacitor, and the coupling winding is coupled in series with the switching inductor to the energy storage inductor, and the secondary winding is transmitted through A rectifier diode is coupled to an output capacitor. In summary, the fly-back conversion device of the present invention suppresses the voltage of the storage capacitor by connecting a coupled winding of a transformer in a loop of the PFC inductor current. At the same time, part of the energy in the energy storage inductor and the coupled winding will be transmitted to the secondary winding through the primary winding of the transformer, and the other part will charge the storage capacitor to reduce the leakage inductance loss caused by the I-horse winding and reduce After the switch is turned off, the generated peak voltage and switching loss increase the overall efficiency of the converter. [Embodiment] Please refer to the second figure, which is a schematic diagram of the device circuit of the first embodiment of the present invention. The flyback converter 200 having a single-stage power factor correction circuit includes a first rectifier 201, a storage capacitor C1, a second rectifier 202, an energy storage inductor Lm: a switch Q1 and A transformer Tr. The first rectifier 201 rectifies an input AC voltage Vin through an EMI filter circuit 210 to generate a first full-wave DC M346217 voltage VI. The storage capacitor C1 is coupled between the first rectifier 201 and a ground terminal G to filter the first full-wave DC voltage VI. The first rectifier 201 rectifies the input AC voltage Vin to generate a first full-wave DC voltage VI to charge the storage capacitor C1 when the input AC voltage Vin is greater than the voltage on the storage capacitor C1. In addition, the second rectifier 202 also rectifies the input AC voltage Vin through the EMI filter circuit 210 to generate a second full-wave DC voltage V2. The energy storage inductor Lpk is coupled to the second rectifier 202 for storing the second full-wave DC voltage V2. The switch Q1 is coupled to the ground terminal G and a primary winding N1 and a coupling winding N2 of the transformer Tr. The primary winding N1 of the transformer Tr and the switching switch Q1 are coupled in series, and then coupled in parallel to the storage capacitor C1, and the coupling winding N2 of the transformer Tr and the switching switch Q1 are coupled in series to the energy storage inductor Lm: . Referring to the second figure, the first rectifier 2〇1 includes rectifying diodes D1, D2, D5 and D6, and the second rectifier 202 comprises rectifying diodes D3, D4, D5 and D6, wherein the rectifying diode D5 and D6 are diodes common between the first rectifier 201 and the second rectifier 202. At the same time, the transformer Tr further includes a secondary winding N3 coupled to an output capacitor C2 via a rectifying diode D7. In addition, the flyback conversion device 200 further includes a controller 204. The controller 204 is coupled to the output storage capacitor C2, and outputs a control signal SW to control the switch according to the output voltage on the output capacitor C2. The switching period of Q1. Referring back to the second figure, the flyback conversion device 200 retains the advantages and results of the circuit in the first figure, but in the flyback conversion device 200 of the present invention, the coupled winding N2 of the transformer Tr is connected in series with the energy storage inductor. Lpfc Μ3462Ϊ7 in the energy storage power reduction ί :::, the primary side of the variable room can be used to pass and cut off, and its control Fang Qing or discontinuous guidance; mold change 'dust: 10: in Even and continuous conduction can be 1 ^ fruit type. The aforementioned 'control' mode is also (ie 鸠), in this critical mode ^ / = the mode of the boundary mode. To reduce the switching switch Q1 under light load, the 'can be limited by the limit of the switching time of the switching switch Q1. The rectifying diode (4) 7 can be (10) ^ one pole two (Schottky Diode) or synchronous diode.

- The first A picture to the second d picture show the operation of the circuit of the creation - the fourth picture is a schematic diagram of the operation waveform of the sword. Coordination, two J △ map and third B map. In this creation, the switch is switched off:; can be divided into four stages. Use the off period. Refer to the third A diagram, the second R闰, —_ ^ ^ to turn on, and store ft two or six. /n - The picture is in afd again, the switch Q1 VI stores the electric thief C1 through the primary winding 忏 of the transformer 耵 and the „Q1 to the magnetizing inductance in the transformer Tr. At the same time, the AC voltage Vin is passed through Two rectifiers 2 〇 2, transformers: planting group N2 and switching switch Q1 to the energy storage inductor - energy storage. And, ::: Passing through the transformer Tr and winding the N2 to the transformer ^ internal energy storage. Electric salty

Assume that the turn-in of the AC power supply is the formula (D '=c4sin cut··· (1) When the switch Q1 is turned on, the current equation of the energy storage inductor and Lppc (2) M346217 (2) is

dL

The current equation of the LpFC magnetizing inductor is (3)

♦ A (3) where UcB is the voltage of the storage capacitor C1, 匕 is the transformer h ΐ, the magnetic inductance, Lppc is the inductance of the energy storage inductor LPFC, “the excitation current of the transformer Tr, ippc is the energy storage inductance” "The current." Assume that the current flowing from the energy storage power m is ieB, kB (4) is obtained: lCB=lm+im··· (4) Guard', middle person] N1 is the ideal current of the primary winding N1 in the transformer Tr. This 4 ' ♦ Ma He winding N2 only flows through the storage of the Shanghai Emperor $ cry τ, occupies his π 丄 1 / melon 尥 stored this inductance of the current ipFC, ipp value can be obtained by the formula (5): (5) lN2 = ipFC · ·. According to the principle of the balance of the ampoule, the formula (6) Μχ^+ΝχΚ)···· (6) According to the two upper formulas (5), (6), the formula (7) is obtained.

^=~17XiPFC 1...(7)

So 'according to the two equations (4), (7)', the equation Q lm = lCB-lNl ^ Β Β ^ + ^ 1 χ ί ρ ^ ^ (8) can be seen from the 'when the switch Q1 is turned on, the transformer ^ M346217 The excitation energy comes from the storage capacitor C1 and the input AC voltage vin. McCaw. In the C diagram and the third circle D, in the b phase, the switching switch 卯 is turned off, and the rectifying diode D7 on the secondary side of the transformer Tr is turned on. At this time, the exciting energy stored in the transformer Tr passes through the rectifying diode D7. Output capacitor C2 is released. At the same time, the input AC voltage Vin passes through the second rectifier 202, the primary winding N1 of the transformer Tr, the coupling of the transformer, and the electric energy storage path of the energy storage inductor lpfc. At this time, the energy of the energy storage inductor Lpfc and the coupling winding N2 is directly transmitted to the secondary side of the transformer Tr, and the other part of the energy is charged to the capacitor C1 until the current of the energy storage inductor Lpfc drops to ' ^. In this way, the energy in the coupling winding N2 can be returned to reduce the peak voltage of the energy 1 of the even 5 winding N2 between the drain terminal and the source terminal of the switching switch Q1, thereby reducing the leakage inductance of the coupling winding N2. The resulting consumption, as well as the switching loss of the switch Q1. When the beta switch Q1 is turned off, the current equation (9) of the energy storage inductor Lpfc is -% ... (9) - the current equation (10) of the magnetizing inductance is: di τη (10) • (11) dt again, according to The principle of ampoule balance, the formula (12) N2xlPFc+N\xim+NsxiD^〇(^|2) then 'M346217 储, the energy storage inductor Lpfc and the excitation inductor current are not interrupted, / melon The current of the rectifying diode D7 on the secondary side of the double-pressed Tr can be expressed by the equation (13): · iD = JtipFc~,, '

N2 . N ^X^c+^(iPFC+im) (13) After the formula (13) is collated, the equation (14 kf, -1, π iipFc+j; xir (14) is transmitted to the transformer; Tr times In addition to the energy on the level side

The =11Γ part is also directly transferred from the energy storage inductor l(4) to I ΓΓ/ normally, the current of the energy storage inductor ^ will be sold, and the shape of the κ '仗 waveform, the shape of the rectifying diode D7 . ^ Continue 'in the e-stage, the excitation energy of the transformer k; the body/7 charges the wheel-out capacitor C2 until the excitation frequency is too high: with t=, in order to prevent the power supply from being present on both the light and secondary sides. The circuit diagram of the device circuit of the second embodiment is based on the primary side R of the (four) 11 Tr. In the present invention, the first embodiment of the 笫一杏# η丄衣13⁄4 tower does not intend to achieve the effect t, the circuit operation example of the brother's consistent example of the flyback type conversion device 3 (10) is the second, the difference, in the second implementation The diode D8 is coupled to the ''one set of clamps, wherein the first-positioner, the first-shun; the % of the capacitor C3 and the resistor R1 form a U-direction diode, 9 is connected in parallel The capacitor core M346217 M n constitutes a second clamp. The first clamp is coupled to the switch opening ϋ # is used to limit the oscillating voltage caused by the transformer leakage inductance across the switch Q1 after the switch Q1 is turned off. Among them, the first forward i-heart: D8 will switch the oscillating voltage generated by the two ends of the switch, and the mountain capacitor a and the resistor Ri are guided to hide. In addition, the diode's crying money can be clamped to the terminal voltage of the storage capacitor state ci through the diodes D1 and D2. m test fifth diagram, the second clamp is coupled to the second rectifier 202, and the generated surger ^ 将 voltage of the second rectifier 202 is guided to the parallel capacitor C3 and the resistor Ri = ', system Switching „ Qi cutoff, the energy storage inductor “and the two poles: oscillating electricity: inter-electrode capacitor vibration” caused by two (four) 罔 + f / /, the circuit of the device of the third embodiment of the creation: = "4 Qiao ^ principle fish, bang # Γ 7 " not a brother and the second embodiment of the circuit action principle, the achievement of the ancestors' main difference is: the third 歹 change device 400 The clamp includes a forward diode D8, a resistor R1, and a capacitor C3. Diode D8, D10, Resistor: The two-capacitor C3 is used to limit the (10) L voltage peak value _ called € ft circuit transformer _ winding, to suppress the voltage of the capacitor M346217 capacitor. At the same time, the energy in the energy storage inductor and the coupled winding will pass through the primary of the f-stage, to the secondary winding, and the other part will charge the capacitor to reduce the coupling winding consumption and reduce the switch. After the cutoff, the leakage inductance is consumed, which in turn improves the overall efficiency of the inverter. Only the switch is the above, only for the best description and week style of this creation, any familiar with the 2 =, [simple description of the diagram] The first picture is a schematic diagram of the traditional device circuit; - The schematic diagram of the device circuit of the embodiment · The younger-A to the first picture is the second creation, the fourth picture is the schematic diagram of the creation operation waveform 4; and the fifth picture is the second embodiment of the creation k 'Setting circuit diagram [Main component symbol description] '(1), schematic diagram of the device circuit: Descending converter 1 〇〇 EMI filter circuit u 〇 wheel-in voltage Vin wheel-in current Ii diode D1 ~ D7 energy storage Capacitor C1 M346217 Output Capacitor C2 Energy Storage Inductor Lpfc Transformer Tr Winding Nl, N2, N3 Ground Terminal G Switching Switch Q1 This Creation: Flyback Conversion Device 200, 300, 400 First Rectifier 201 Energy Storage Capacitor C1 Second Rectifier 202 Energy storage inductor Lpfc switch Q1 transformer Tr EMI filter circuit 210 rectifier diode D Bu D7 input voltage V i η output capacitor C2 primary winding N1 coupling winding N2 secondary winding N3

Ground terminal G switch Q1 M346217

Controller 204 first full-wave DC voltage VI second full-wave DC voltage V2 control signal SW forward diode D8, D9, D10 - resistor Rl, R2 - capacitor C3

> Output voltage VO

Claims (1)

M346217 IX. Patent application scope: 1. A flyback conversion device with a single-stage power factor correction circuit, comprising: a first rectifier for rectifying an input AC voltage to generate a first full-wave DC voltage; An energy storage capacitor is coupled between the first rectifier and a ground, the energy storage capacitor filters the first full-wave DC voltage; and a second rectifier rectifies the input AC voltage to generate a second full-wave DC voltage; a storage inductor coupled to the second rectifier, the energy storage inductor stores the second full-wave DC voltage; a switch is coupled to the ground; And a transformer having a primary winding and a coupled winding, wherein the primary winding is coupled to the storage capacitor in parallel with the switching-on relationship, and the coupling winding is coupled in series with the switching inductor to the energy storage inductor. 2. The flyback conversion device with a single-stage power factor correction circuit according to claim 1, wherein the transformer further includes a secondary winding coupled to the rectifier via a rectifying diode An output capacitor as described in claim 2, wherein the rectifying diode is a Schottky Diode or a synchronous device having a single-stage power factor correction circuit as described in claim 2 Diode. 4. The single-stage power factor correction Μ3462Ί7 directional diode is coupled to the parallel capacitor resistor group as described in claim 2, and the second forward diode generates the second rectifier The oscillating voltage is drawn to the parallel capacitor resistor group for venting.