TW200832883A - Power supply and charger for series-parallel loosely coupled inductive power transfer system - Google Patents

Abstract

A power supply and charger for series-parallel loosely coupled inductive power transfer system are provided. The power supply includes a DC-AC converter, capable of converting a DC voltage and/or current into a AC voltage and/or current, a transformer, a first capacitor, a second capacitor, a full-wave rectifier, a filter, a load and a phase-locked circuitry that output a variable frequency signal into a PWM control circuitry, said phase-locked circuitry controlling the output frequency of said DC-AC converter in order to achieve the output voltage and output current of said DC-AC converter is in-phase.

Description

200832883 ^ IX. Description of the Invention: [Technical Field] The present invention relates to a power supply system for weakly coupled inductive power transmission, and more particularly to a power supply and a charger for series-parallel weakly coupled inductive power transmission. [Prior Art] The Loosely Coupled Inductive Power Transfer System (LCIPTS) can transfer electrical energy from one device to another without direct transmission through the power line. Therefore, it has the advantage of avoiding the risk of sparking or electric shock. In addition, because there is no contact, it is beneficial to the life of the device. @此已相#_Airtight instrument equipment internal power supply or wheel environment "Weiqian Shiqi fresh place _ power supply system of potentially dangerous environment where electric shock occurs. Typical _ inductive power transmission power supply wire or charging ϋ, by The structure consisting of three parts of the resonant inverter 10, the detachable isolation (four) 20 and the controllable rectifier 30 is as shown in Fig. 1. It is mainly a detachable high frequency transformer with a pre-reactor to The power is transmitted from the power supply terminal to the system load side. However, because the leakage inductance of the weak and light non-contact type changer is very large, and the switching loss of the front inverter is inevitable, the typical weak light combined induction power transmission is The electric wire or charger has a very low power transmission scale. In order to solve the problem of poor transmission efficiency of the non-contact power transmission system, the switch technology uses the zero voltage or zero current switching method to take care of the weak induction sensor. In the power transmission system, to reduce the vibration of the vibrating inverter __ to improve the overall efficiency of the system, and due to the defects of the congenital transformer, the overall efficiency of the system is quite limited. 832883 or shunt capacitor on one or the secondary side of the transformer, using impedance matching method for system compensation, can solve the problem of inconsistent coupling failure of isolated transformer in a more direct way. Generally speaking, 'using series or parallel (Parallel) can achieve the expected efficiency on either the primary side or the secondary side. On the other hand, the system reduces the cost of the system to obtain the maximum output power at the minimum input volt-ampere capacity. 'The input side must satisfy the zero phase angle. (zer〇phase angie). However, when the system load changes, there is more than one solution that satisfies the zero phase frequency of the input side, and the frequency of this branching point is related to the system load and the coupling coefficient, and the corresponding branching point frequency corresponds. The output power is also different, which increases the difficulty of system design and control. At the same time, because the feedback signal of the control circuit design is obtained from the secondary side of the weakly coupled transformer, it cannot accurately meet the weakness of the non-contact power transmission system. The detachable characteristic of the primary and secondary side core windings of the coupling transformer. Accordingly, the present invention discloses that the primary side is controlled by the primary side. The power supply of the parallel weakly coupled inductive power transmission is either charged or charged, and the overall transmission efficiency of the power supply or charger of the series-parallel weak I-inductive power transmission is improved. [Invention] In an embodiment Providing a power supply for series-parallel weakly coupled inductive power transmission, comprising: a constant AC converter for converting a DC voltage source into an AC voltage source; and a transformer having a primary side and a secondary side, the primary The side has a first self-inductance, the second side has a second self-inductance, a first capacitor, a primary side of the transformer and an output side of the direct current converter, a second capacitor, and a second parallel transformer a secondary wave; a full-wave rectifier, paralleling the second capacitor; a filter circuit, paralleling the full-wave rectifier; a load, paralleling the filter circuit; a phase-locked control circuit, outputting a frequency-modulated frequency signal to a PWM control circuit, The phase lock control circuit controls the 6200832883 of the direct current converter, so that the voltage on the output side of the direct current conversion 11 and a current = zero =; the PWM control circuit , including: "value", a triangular wave to generate a mouth ^, , by · crying in a /, a comparator; an error controller, the direct AC conversion ratio; the second voltage and the set value error And the triangular wave is switched by the comparator: the voltage of at least the switching element of the converter is nearly equal to the set value. In another embodiment, the stencil includes a charger that has been contending for parallel coupled weakly coupled inductive power transmission, a transformer: stream: change; and is used to convert the dc source to an ac secondary side. The second self-inductance; _ flute _ + - person n brothers ad Φ ^ λ ^ brother one electric valley, the first side of the transformer and the straight wave IV wide: the output side; - the second capacitor, parallel to the transformer two Secondary side; - all two capacitors; - wave circuit, parallel to the full wave rectifier; a wave circuit; - phase lock control circuit, output - modulation frequency signal (four) 13 shop her circuit control the output side of the stream converter The frequency is such that the output side of the (four) direct-to-AC converter is - and the current is zero phase; the PWM control circuit includes two set values, - a triangular wave generator, a generated - triangular wave; - a comparison ϋ; _ error control, The error of the voltage on the output side of the direct current converter and the set value is compared with the three oscillating-comparator to control at least one off component of the direct current conversion II, so that the output side of the direct current converter The voltage is approximately equal to this setting. In a further embodiment, a power supply provider of a series-parallel weakly integrated inductive power transmission is provided, which includes a direct parental flow conversion II for converting a DC voltage source into an AC current source; - the transformer 'has a secondary side and a secondary side, the primary side has a first self-inductance 'the secondary side has a m _ _ capacitor' series connected to the primary side of the transformer and the straight parent flow is converted to the output side; _ second capacitor, parallel to the secondary 7 200832883 side of the transformer; a full-wave rectifier 'parallel to the mth road, parallel the full-wave rectified m parallel wave circuit; - phase-locked (four) circuit, output a frequency-modulated frequency signal to a PWM (four) circuit, the phase lock control circuit controls a frequency of the output side of the direct current conversion, such that a voltage of one of the output sides of the direct current converter is zero phase; the PWM control circuit includes: _ set value , a triangular wave generator 'generating-triangular wave; _ comparator; - error control, the output of the direct current converter, the error of the current and the set value is compared with the triangular wave after the comparator is controlled (four) direct AC conversion ^ at least _ switching components, so The stream converter parent whom the direct current output side of the nearly equal to the set value. In still another embodiment, a charger for series-parallel weakly coupled inductive power transmission is provided, comprising: a constant AC converter for converting a DC voltage source into an AC current source; and a transformer having a primary side and a second a secondary side, the primary side has a first self-inductance, the secondary side has a second self-inductance; a first capacitor is connected in series with the primary side of the transformer and the output side of the direct current converter; a second capacitor, Parallel to the secondary side of the transformer; a full-wave rectifier mushroom, paralleling the second capacitor; a filter circuit, paralleling the full-wave rectifier; a load, paralleling the filter circuit; outputting a modulated frequency signal to a PWM control circuit, An error control is that the phase lock control circuit controls a frequency of an output side of the direct current converter such that a voltage of one side of the output side of the direct current converter is zero phase with a current; the PWM control circuit includes: a setting Value, a triangular wave generator, generating a triangular wave; a comparator; - an error controller, an error of the current on the output side of the direct current converter and the set value and the triangular wave Comparison of the comparator controlling at least one switching element of the DC to AC converter, such that the output of the linear 8200832883 AC side of the converter - this current nearly equal to the set value. The features and advantages of the embodiments of the present invention are apparent from the following detailed description. [Embodiment] Hereinafter, preferred embodiments of the present invention will be described. Although the present invention is also preferred, it should be understood that the present invention is not limited to the embodiments. Rather, the invention is intended to cover all alternatives, modifications, and equivalents, which are within the spirit and scope defined by the scope of the invention. In addition, well known methods, procedures, components, and circuits have not been described herein in order to avoid unnecessarily obscuring the innovations of the present invention. T Drink 1 shows an example block diagram. Among them, a series connection in series can be used to improve the non-contact power transmission of the detachable isolation transformer 20 The power transmission wheel. The invention is based on the preferred embodiment - the same as the second embodiment. It is understood that the invention is not limited to the embodiments. On the contrary, the present invention covers all the alternatives, the spirit of the definition of the definition and the (4) & some are included in the attached application, the first assumption is that the components of the system are the rational components, ah, this fine power According to the age of the 贞, the load is simultaneously charged and the power is repeated 9 200832883 is the AC voltage of pure sine wave. The symbols in Figure 2 are defined as follows: Clever: represents the input voltage phasor of the separable isolation transformer 20: represents the input current phasor of the separable isolation transformer 20: represents the separable isolation transformer 20 - secondary side self-inductance L2: represents the secondary side self-inductance of the separable isolation transformer 20: represents the detachable isolation transformer 20 mutual inductance C; represents the separable isolation transformer 20 - the secondary side series compensation capacitor C2: represents the separable isolation transformer 20 Secondary side shunt compensation capacitor core: represents the load of the system 40 Z2: represents the separable isolation transformer 20 secondary side impedance A: represents the equivalent impedance of Z2 reflected to the primary side via the separable isolation transformer 20 A: represents the system input impedance It can be found that 1/J must be (the parallel impedance of 2:7 and 7^ is as follows. 2 2 RJ = Rac = Rac - jRac2〇) C2 2 — Rac+Vjo?C2 A 1 + wind ^ 2 ai +

=K · K \ + {RccdC2)2 Jl + (R^C2Y three n (1) Secondly, we can use the basic principle of circuit to find the equivalent impedance of Z2 reflected to the primary side via the cocoa separation transformer 20: z (—ο2 rj〇^L2 + Z2 200832883 (ωΜ)2 A R2+j(〇)H) _{ωΜ)2[Κ2-]{ωΙ^ΧΊ)-\——~~^2+(ωΐ2^χ2γ~ ~ (2) =_^〇2· and -+ .p (^m)2.(^i2~x2) Κ22+(ω12-Χ2)2 -R+jXr

Finally, by equation (2), we can find the input impedance A of the system of Figure 2.

Zlr)=Zr+J^Ll +—

Rr + j[wLx + ^] (3) K +, since Figure 2 New Zealand assumes that the power is older, the power will be equal to the input real power. And input the complex power; ζ can be obtained as follows·· 曰 V=%

—► 2 VP

Z/” Rin-jXin — RJTX %

R

VP

X

K ^, 2+xPp+jQP (4) Because of the energy reduction law, you can lose money _ negative power "PS (^AA)

R above (5) 11 200832883

R (ωΜ)2 ? Xin=1〇)Ll J___(ωΜ)2(ω12-Χ2)S Fly 2+« - Z2 )2 The object of the present invention is to first determine C; and C2i optimal parameter value 俾 get the maximum The output power A, which can be obtained by calculus to find the extremum, is solved by the following three necessary conditions: ^Ps _ dC' " =0 (6a) Dead · dC2 =0 (6b) 9PS. 8ω : 0 ( 6c) Substituting equation (5) into (6) yields the following three equations: dc, => d

R ac^, 2+x ") = 〇 => d

R dC^R^X:) V in in / in , /^r m ifi 9Cj dC} 5C] => (X 2 - R 2)^-- 27? Xr^ = 0 dCx

dC (7) da => d

R ac/i?, 2+x => a R, dC2(R2^Xin2) 12 200832883

1 ^·(RJ + Xm2) — 2Rit^ — 2IL ·X^ dX da v/;7 夂m (8) =>(X 2-R 2)^-2R X ^ = 0 \ !H ΠΊ ^ in in , / oC, oC, 0 dPs_ δω => a

R =>

d R ;) = 〇θω(Κιη2+Χιη2) 0 dR'-2R.jd〇δω in in δω =>(X 2-R 2)&-2RX ^ = 0 \ in in / ^ in in οω οω (9) Calculate the equations (7), (8) and (9) with the commercial software MATLAB, and rearrange the results to obtain dPs= ^LxL2k2Rac (Α6ω6 + Α4ω4 + Α, ω2 + Rj) dc, " ς3.[ {l2c2rJ . +(l22 -il2c2rc^2+Rjf where A6=Lf, L22C22Rj{k2-\)4 = (Z2C9)2 + like CVC ·(2- P) A^-ILARJ-L'C' IC dPs _ -2LxL22k2Rj · ω2 · (Ββω6 + ΒΑωΑ + Β2ω2 -1) δς = Q2 -[{L2C2RJ - ωΑ + (L22 - 2L2C2RJ)^ + RJ]2 (10) 0 (ii) B^L 'W/iJc4 - 2k2+l) 13 (12)200832883 B^LxCr{2L2C2+LxC,)\k2 B2 = L2C2 + LXCX -(2-k2) d(° in the above formula +/

A = A ^\2^22C22Rac2 * (2A:4 - 4^2 + 2^A = (2Ac^ca/)(AC1+i2c2).(^ D2 = -L22 + (L2c2 + LC,)· 2RJ ” +(Ας!2)2·(ρ -2^2+i) and by equations (10), (11) and (12), we can get Ci and c as follows: Q_"_= 11 must be -1) (Moxibustion +1) _^1^c2 = ^r ω212 where moxibustion is a separable isolation transformer 20, which is defined as follows: (13) (14) k =

, 〇 < moxibustion < 1 (15) In fact, in the above director process, it is assumed that the components in Figure 2 are ideal components, there is no other loss, so we can also solve from the perspective of engineering design (^ and. 2 as follows : Firstly, to obtain the minimum round-turn volt-ampere capacity to reduce the cost, we can obtain the virtual power ^ in equation (4) to obtain q. --- 2 Let 0X, C2) == 〇一 14 =0 ^ ^ = 0200832883 3 coL'--- 1 ωΟλ {ωΜ)\ωΙ^ΧΊ) R22+^L2-X2)2 ^ — = co2 L· — ς ω^Μ\ω11-Χ1)

Rl^L2-X2f (16) --±1^— (Ζ2+Ζ3)·ΐ4

Zi = 〇/L22C22Rj - 2o?2L22C2RJ + Rj + ων2 χ2 = - ω4Σ22α22Καο2) χ3 = (^2L22k2C2Rac2 + ω%^2 - Rj - ω2Σ22 + ω2^2) X, = c〇2Lx Next, then (5) Substituting (6b) can get _21 L' k6Rj (ω2L2C2 __ (^%2C22RJ - 2^l2c2rj+RJ+c〇\y = 0 (17) Therefore, we can get the same result as (6b) from equation (17) Then, the obtained devaluation value is substituted into (16), and the best value is obtained. The result is exactly the same as (14). So far we can know the results of equations (6a), (6b) and (6c), under the assumption Under ideal component conditions, the input volt-ampere capacity is required to be the minimum value. Because it is 0 or equivalent to zero in equation (4) under the optimal parameter value, ie X丨„=〇)L"

(ωΜ)2(ωΣ?-ΧΊ) Κ22+(ω12^Χ^ =0 (18) 15 200832883 The equation (18) can be rearranged to obtain the following 7V〇) polynomial equation Ν{ω) - Ε6ω6 + Ε, ω4 + Ε2ω2 - R2ac = 0 (19) In the above formula, £6^(Z1CΛ2C2X^L1L22^C1C23⁄4c2)

Ea = (^eC^Rj-^L.qL, 2 ^L22C22Rac2 ^C^C.RJ-LxL22k2Cx) E2=^L22 + 1L2C2RJ+L^RJ) Since (14) know that the best C2 value must be satisfied still 2 = 1/(Z2C2) relationship, so we can express state >) to the following form Ν{ω) = (ω2

LA -)χ (αω2 + Βω + ο)χ(άω2 +βω + /) = 0 (20) Comparing the coefficients of the equations (19) and (20), we can get ad^{L:-C^Rj ) ae + bd = 0 (af + be + cd ad, L22.C22.Rj.(k2-2) l2c2 l_k2 +l23c2-l2

R bf + ce-^^ = o ce — l2c2 af + be+ cd l2c2 [-L22+2L2.C2.RJHL’^^)] bf + ce Z2C2 cf l2c2

R (21)(22) (23) (24) (25) (26) (27) 16 (28)200832883 Therefore, by equation (20), we can find other solutions αω2 +δω + ο = 0 from the factor of decomposition. Dco + + = 0 The positive real solution from equation (28) can be called the following * (^2 V^") )=-^--- L 2.L,C2.Rac.(l - k2) From the equation (29), the positive real number solution can be obtained as follows, such as 'such as 2 - stone 3' C〇=----- H 2.L2.C2.Ra, (l-k2) The definition is as follows (2^ = Z>2 * (^2 - 1) a2={L2-L2-k2 -2-C^Rj +C2-RJ -k1) a3 = ^Ja'· oc2 cc'=mk, C, Ram a2 = (L2-L2-k2-4-C2-Rc2+3-C2-Rc^k2) (29) (30) (31) From the above results, we can see that: (1) The series-parallel type separable The isolated inductive power transmission system power transmission system has three operating frequencies that can operate at a minimum input volt-ampere capacity under sufficient conditions of maximum output power, ie, %=-^=1= and %. Where ^ and % are related to the AC resistance load I and the coupling 17 200832883, but the % remains relatively constant. (-) General rule 峨 峨 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四The electric μ is a sine wave and the frequency is '吟 and ' as the theory · «Entering the human god | s| is indeed equal to the power phase difference θ = 0) 〇, on the other hand, the equation obtained by the equation (16) The formula is substituted into the system's input impedance. We can get d (32). From equation (13), we can get "°=1/mad formula, and let 彳να all input the impedance &

Ll (33) (7)" formulas obtained by the formula (Π) are substituted into the system input impedance & we can get H (34). From equations (32), (33) and (34), we know that w ς, C2 and (4) When the value is: 1 · Listening ^ When the heart is inversely proportional to the heart 2 · When & is proportional to the heart 3 · 妒 ^ ζ ί ί ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ The secondary side of the wheel 18 (35) 200832883 power is equal to the input power Pp

Vp 2 lz, J Ip Z,

Ps

R

• H (36) When the system is in the voltage source and or the current source, the circuit has the following six operation modes: when the above three resonant frequencies are called, must be 0 and called. Α·Transformer input power supply form is a constant voltage source (A is a ten-day-style “--called the time center is inversely proportional to 40%, and the output characteristic of the circuit can be derived as a constant current source (Is is a fixed value), and C2 Α· (Acupuncture 2) (37) The constant voltage pull type 2. (four)" is proportional to the output characteristic of the circuit can be converted to a source (vs is a fixed value), and k

V. Mode 3 · still & inversely proportional to the heart, is the fixed value), and (38) can push the wheel specials of the f road _ ^ current source

VP C2 丨V(u) β. Transformer input power supply is a constant current source (f| is constant) 19 (39) 200832883 Mode 4· ” is inversely proportional to the heart, and the output characteristic of the circuit can be derived as a certain voltage source ( |5| is a fixed value), and V(u) (40) c2 nucleus 5· ω must be 27 与 and (in proportion to, the output characteristic of the circuit can be derived as a constant current source (Is is a fixed value), Moreover, (41) '弋(7)" When Z~ is inversely proportional to &, the output characteristic of the circuit can be derived as _ constant voltage source (redundancy is fixed), and .V(u) (42) circuit characteristics and mathematical relationship V ~ξ~~ Finally, we have reorganized the above six operating modes in the case of AC output in Table 1. As shown in the above description, when the system operating frequency _, , hand feng outside and 咚牯, can Meet the minimum input volt = ... face, Jing Shanna Xie electric calendar source or 疋) handle 'can be hungry _ fine _- ^ Laiyuan slave electrical surface, virtual output resistance has nothing to do. So when the load is out and the movement is stopped, People can _ frequency conversion rnmm system input side zero phase frequency outside, at the same time use pulse wave source or constant current source, you can... μ input person Wei form for the light cup Mingke, reach the control system round out for the fixed cake (fixed The purpose of current). Therefore, on the primary side of the transformer, it is easy to realize the single-circuit circuit, and it can improve the sense of shafting. See the early work. Overall transmission of power supply or charger for transmission 20 200832883 Efficiency. To further clarify the implementation architecture of the present invention, FIG. 4 illustrates a simplified block diagram of an exemplary power supply embodiment of a series-parallel type weakly coupled inductive power transmission; FIG. 5 illustrates an exemplary series-parallel type weakly coupled inductive power. A simplified block diagram of a transport charger embodiment. The techniques and wording used in this article are descriptive rather than limited terms, and the Society uses this ❺鲁丁立辞〗 to not exclude other features (or features - (10) Temple with the features disclosed and described here. It should be appreciated that the present invention is exemplified within the scope of the patent application. This "financial" is in other materials, _ and plunging.

200832883 [Simple diagram of the diagram] Figure 1 shows the basic architecture of a typical detachable isolated inductive power transmission system. 2 is a series-parallel contactless power transmission system of the present invention. Figure 3 is a diagram showing the variation of the frequency β versus apparent power |S|, output power, and phase difference (9). Figure 4 is an embodiment of the present invention. Figure 5 is another embodiment of the present invention. Description] 10: Resonant inverter 20: separable isolation transformer 30: controllable rectifier 40: load 50: full-wave rectifier 60: voltage source 70: voltage divider 80: current sensor 90: filter circuit 100: straight AC converter 200: PWM control circuit 210: Switch driver 220: Comparator 270: Phase lock control circuit 280: Error controller 290: Triangle wave generator 22

Claims (1)

200832883 X. Patent application scope: 1. A power supply for series-parallel weakly coupled inductive power transmission, comprising: a constant AC converter for converting a DC voltage source into an AC voltage source; a transformer with a primary side And the secondary side, the primary side has a first self-inductance, the secondary side has a second self-inductance; a first capacitor is connected in series with the primary side of the transformer and the output side of the direct current converter; Capacitor, parallel to the secondary side of the transformer; a full-wave rectifier, parallel to the second capacitor; a filter circuit, parallel to the full-wave rectifier; a load, parallel to the filter circuit; a phase-locked control circuit, output a modulation frequency The signal is connected to a PWM control circuit, and the phase lock control circuit controls the frequency of the output side of the direct current converter such that a voltage on the output side of the direct current converter is zero phase with a current; the PWM circuit includes: a set value; a triangular wave generator generating a triangular wave; a comparator; an error controller, the voltage on the output side of the direct current converter The error of the set value after comparing the triangular wave comparator controlling at least one switching element of the DC to AC converter such that the voltage set value approximately equal to the output of the inverter section of the side. 2. If the power supply of the first application of the patent scope is applied, the primary side and the secondary side of the transformer can be separated. 3. If the power supply of claim 1 is applied, the PWM control circuit includes a switch driver. 4. If the power supply of the first application of the patent range is applied, the voltage on the output side of the direct current converter is taken out by a voltage divider. 5. As in the power supply of claim 1, the current on the output side of the direct current converter is taken out by a current sensor. 6. A charger for series-parallel weakly coupled inductive power transmission, comprising: a constant AC converter for converting a DC voltage source into an AC voltage source; a transformer having a primary side and a secondary side, the primary side Having a first self-inductance, the secondary side has a second self-inductance; a first capacitor connected in series with the primary side of the transformer and the output side of the direct current converter; a second capacitor connected in parallel with the transformer a full-wave rectifier, parallel to the second capacitor; a filter circuit, parallel to the full-wave rectifier; a load, parallel to the filter circuit; a phase-locked control circuit, outputting a modulation frequency signal to a PWM control circuit, a phase lock control circuit controls a frequency of an output side of the direct current converter such that a voltage of the output side of the direct current converter is zero phase with a current; the PWM control circuit includes: a set value; a triangular wave generator a triangular wave; a comparator; an error controller, the voltage on the output side of the direct current converter and the set value error and the triangular wave After the comparison in the comparator controlling the DC to AC converter of the at least one switching element, such that the electrical output of the DC to AC converter and the pressure side of 24200832883 approximately equal to the set value. 7. If the charger of claim 6 is applied, the primary side and the secondary side of the transformer may be separated. 8. The charger of the sixth application of the patent scope, the PWM control circuit further comprising a switch driver. 9. If the charger of claim 6 is applied, the voltage on the output side of the direct current converter is taken out by a voltage divider. 10. As claimed in claim 6, the current of one of the output sides of the direct current converter is taken out by a current sensor. 11· A power supply for series-parallel weakly coupled inductive power transmission, comprising: a constant AC converter for converting a DC voltage source into an AC current source; and a transformer having a primary side and a secondary side, The first side has a first self-inductance, the second side has a second self-inductance; a first capacitor is connected in series with the primary side of the transformer and the output side of the direct current converter; a second capacitor is connected in parallel with the transformer a secondary wave; a full-wave rectifier, paralleling the second capacitor; a filter circuit, paralleling the full-wave rectifier; a load 'parallel to the filter circuit; a phase-locked control circuit, outputting a frequency-modulated frequency signal to a PWM control circuit, The phase lock control circuit controls the frequency of the output side of the direct current converter so that a voltage of one of the output sides of the direct current converter is zero phase with a current; the PWM control circuit includes a set value; An angular wave generator that generates a triangular wave; 25 200832883 a comparator; - an error port controller 'the current on the output side of the direct current converter and the setting, M after a difference between comparator which compares the DC to AC converter controls & matter > n member, such that the far current setpoint output of the DC to AC converter side of the nearly equal. 12. 13. 14. 15. 16. For the power supply of paragraph u of the patent scope, the secondary side of the transformer can be separated. The PWM control circuit further includes a switch actuator, such as the power supply H of claim 11 of the patent application. For example, the Shenzhou Patent Model 'u's Wei supplier, the voltage on the output side of the direct AC converter is taken out by a voltage divider. For example, the power supply of the Shenqing Patent Model '11', the current on the output side of the DC converter is taken out by the _ current sensor. A series-parallel weak-inductive power transmission charging port, comprising: a direct AC converter for converting a DC voltage source into an -AC current-transformer, with a secondary side and a secondary side, the primary side device - a first self-inductance, the second side has a second self-inductance; a first capacitor, connected in series with the transformer H - the secondary side and the output side of the direct current converter; a second capacitor connected in parallel with the transformer a full-wave rectifier, parallel to the second capacitor; a filter circuit, parallel to the full-wave rectifier; a load, parallel to the filter circuit; a variable frequency signal to a PWM control circuit, an error controller, shackle The phase control circuit controls the frequency of the output side of the direct current converter such that a voltage of one of the output sides of the direct current converter is zero phase with a current; the PWM control circuit includes: a set value; a triangular wave generation a triangular wave; a comparator; 1 an error controller, the error of the current on the output side of the direct current converter and the set value is compared with the triangular wave after the comparator At least one switching element is made of the DC to AC converter, such that the current set value of the output side of the DC to AC converter of nearly equal. 17. If the charger of claim 16 is applied, the primary side and the secondary side of the transformer may be separated. 18. The charger control circuit further includes a switch driver as claimed in claim 16 of the patent scope. 19. For the charger of claim 16 of the patent scope, one of the voltages on the output side of the direct current converter is taken out by a voltage divider. 20. As claimed in claim 16 of the patent scope, one of the currents on the output side of the direct current converter is taken out by a current sensor. 27