CN106253689A - IPT system high-gain energy injection type push-pull topology circuit, control system and control method - Google Patents

Abstract

The present invention proposes a kind of IPT system high-gain energy injection type push-pull topology circuit, control system and control method, IPT system is made up of primary circuit and secondary circuit, primary circuit is also in series with at least one switching tube, by adjusting conducting and the cut-off of switching tube, it is achieved inverter circuit and the break-make of resonant network.The present invention is by connecting at least one switching tube in primary circuit, the break-make of converter bridge switching parts pipe S1 and S2, the energy injection of control system is controlled, it is achieved high-gain exports by regulating the turn-on cycle of this switching tube, improve the range of accommodation of input and output gain, and realize voltage stabilizing regulatory function.

Description

IPT system high-gain energy injection push-pull topology circuit, control system and control method

technical field

The invention relates to an IPT (Inductively Power Transfer, inductive power transfer) system energy injection push-pull topology circuit technology, in particular to an IPT system high-gain energy injection push-pull topology circuit, a control system and a control method.

Background technique

In the IPT system, the system realizes the wireless power transmission through the loose coupling of the magnetic field, so that the overall gain of the system is limited. The output gain of the existing topological compensation structure is generally low, and the power adjustment of the system needs to be realized with an external control or auxiliary circuit, which increases the complexity of the system to a certain extent. How to design the topology circuit of the IPT system in order to achieve high-gain output, improve the power adjustment range, and the voltage regulation function has important practical significance.

Contents of the invention

In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a high-gain energy injection push-pull topology circuit, control system and control method for an IPT system.

In order to achieve the above object of the present invention, according to the first aspect of the present invention, the present invention provides a high-gain energy injection push-pull topology circuit of an IPT system. The IPT system is composed of a primary side circuit and a secondary side circuit. The side circuit is provided with an inductance L _DC , one end of the inductance L _DC is connected to one pole of a DC power supply, and the other end is connected to an inverter bridge circuit, the inverter bridge circuit includes two bridge arms, and the first bridge arm includes a first The phase-splitting inductance L ₁ and the first switching tube S ₁ , the second bridge arm includes the second phase-sharing inductance L ₂ and the second switching tube S ₂ connected in series, and the output terminal of the primary side circuit is connected to the primary side resonant inductor Lp and the primary side respectively The compensation capacitor Cp is connected, wherein, the primary side resonant inductance Lp is connected in parallel with the primary side compensation capacitor Cp, and the secondary side circuit includes a secondary side resonant inductor Ls, a secondary side compensation capacitor Cs, a rectifier bridge and a load R, and the secondary side The resonant inductance Ls is connected in parallel with the secondary side compensation capacitor Cs, and the current output by the secondary side resonant inductance Ls is rectified by the rectifier bridge and transmitted to the load R to supply power for the load R; the high-gain energy injection push-pull topology circuit in the original At least one switch tube is also connected in series in the side circuit, and the on-off of the inverter circuit and the resonant network is realized by adjusting the conduction and cut-off of the switch tube.

The high-gain energy injection push-pull topology circuit connects at least one switch tube in series on the primary side circuit, controls the on-off of the inverter bridge switch tubes S1 and S2 by adjusting the conduction period of the switch tube, and controls the energy injection of the system to realize High-gain output, improving the adjustment range of input and output gain, and realizing the voltage regulation function.

In a preferred embodiment of the present invention, two switch tubes S ₃ and S ₄ are connected in series on the primary side circuit, the switch tube S ₃ and the switch tube S ₄ are turned on and off at the same time, and the switch When the tube S3 and the switch tube _S4 are turned _on , _one and only one of the switch tube S1 and the switch tube S2 is turned _on . By arranging two switch tubes, the stability of the circuit is improved.

_In another preferred embodiment of the present invention, the duty cycle of the switch tubes S1 and S2 is D, and 0.5≦D< ₁ , and the duty cycle of the switch tubes S3 and S4 is _{1 -} D. By adjusting the duty ratio of the switching tube to adjust the input and output gain, the stable adjustment of the output voltage is realized.

In another preferred embodiment of the present invention, the secondary circuit further includes a filter circuit, the filter circuit includes a filter capacitor C _f and a filter inductor L _f , the filter capacitor C _f is connected in parallel with the load R, The filter inductor L _f is connected in series on the power supply line from the rectifier bridge to the load R. Filter out the stray signal in the power supply to ensure the stable operation of the load.

In another preferred embodiment of the present invention, the input-output gain is:

$<span\; class="notranslate">\; |</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&omega;MR</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; )</span>\sqrt{{<span\; class="notranslate">\; \&lsqb;</span>{\mathrm{<span\; class="notranslate">\; \&omega;L</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&alpha;\&omega;C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}<span\; class="notranslate">\; \&rsqb;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ,</span>$

Among them, α＝R _p Z _S +ω ² M ² , resonant frequency Ls is the resonant inductance of the secondary side, Cs is the compensation capacitor of the secondary side, M is the mutual inductance, R _eq = π ² R/8 is the impedance before the load is equivalent to rectification, D is the duty cycle of the switch tubes S1 and S2, and Lp is The resonant inductance of the primary side, the total impedance of the secondary side is:

Neglecting the internal resistance of the coil, it simplifies to:

${\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; \&omega;L</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&omega;\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; .</span>$

By adjusting the duty ratio D of the switch tube, the input and output gain can be adjusted to realize the stable adjustment of the output voltage.

In order to achieve the above object of the present invention, according to the second aspect of the present invention, the present invention provides a control system of an IPT system high-gain energy injection type push-pull topology circuit, which includes the IPT system high-gain energy injection type of the present invention A push-pull topology circuit and a control unit, the output terminals of the control unit are connected to the control terminals of the switch tube S ₁ , the switch tube S ₂ , the switch tube S ₃ and the switch tube S ₄ , and the control unit controls the switch tube S ₃ and the switch tube S 4 _The switch S4 is turned _on and off at the same time, and when the switch S3 and the switch S4 are turned _on , the control unit controls the switch S1 and the switch _S2 to have _one and only one conduction.

Through the control unit, the switch tube S ₁ , switch tube S ₂ , switch tube S ₃ and switch tube S ₄ are turned on and off, control the energy injection of the system, realize high gain output, improve the power adjustment range, and regulate voltage Features.

In order to achieve the above object of the present invention, according to a third aspect of the present invention, the present invention provides a control method for a high-gain energy injection type push-pull topology circuit of an IPT system, which includes the following modes:

(1), the control unit controls the switch tubes S ₂ , S ₃ , and S ₄ to turn on, and S ₁ to turn off. The energy stored in the inductor L ₁ is transferred to the primary side resonant network through the switch tubes S ₄ and S ₃ , and the inductor L ₂ In the energy storage state, the inductor L ₁ discharges;

(2), the control unit controls the switching tubes S ₃ and S ₄ to be cut off, and controls the switching tubes S ₁ and S ₂ to be turned on, the inductors L ₁ and L ₂ are both working in the energy storage state, and the primary side resonant network is disconnected from the inverter circuit On, the primary side resonant network enters the free oscillation mode;

(3), the control unit controls the switch tubes S ₁ , S ₃ , and S ₄ to turn on, and S ₂ to turn off, and the energy stored in the inductor L ₂ is transferred to the primary side resonant network through the switch tubes S ₃ and S ₄ , and the inductor L ₁ is in the energy storage state, and the inductor L ₂ is discharged;

(4), the control unit controls the switching tubes S ₁ and S ₂ to be turned on, the switching tubes S ₃ and S ₄ are turned off, the inductors L ₁ and L ₂ are both working in the energy storage state, and the primary side resonant network is disconnected from the inverter circuit , the primary resonant network enters the free oscillation mode.

The present invention controls the conduction and cut-off of the switch tube S ₁ , the switch tube S ₂ , the switch tube S ₃ and the switch tube S ₄ through the control unit, realizes the energy injection of the system, realizes the high-gain output, improves the adjustment range of the power, and stabilizes the pressure adjustment function.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural view of an IPT system high-gain energy injection type push-pull topology circuit in a preferred embodiment of the present invention;

Fig. 2 is the timing diagram of switching tube drive of the circuit shown in Fig. 1;

FIG. 3 is a working mode diagram of the circuit shown in FIG. 1 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two The internal communication of each element may be directly connected or indirectly connected through an intermediary. Those skilled in the art can understand the specific meanings of the above terms according to specific situations.

The present invention provides a high-gain energy injection push-pull topology circuit for an IPT system. As shown in Figure 1, the IPT system is composed of a primary side circuit and a secondary side circuit. The primary side circuit is provided with an inductance L _DC and one end of the inductance L _DC Connect the positive pole of the DC power supply V _in , the other end is connected to the inverter bridge circuit, the inverter bridge circuit is connected to the negative pole of the DC power supply V _in , the inverter bridge circuit includes two bridge arms, the first bridge arm includes the first phase sharing inductance connected in series L ₁ and switch tube S ₁ , the second bridge arm includes the second phase-sharing inductance L ₂ and switch tube S ₂ connected in series, and the output terminals of the primary side circuit are respectively connected to the primary side resonant inductor L _p and the primary side compensation capacitor C _p , Among them, the primary side resonant inductance L _p and the primary side compensation capacitor C _p are connected in parallel, the secondary side circuit includes the secondary side resonant inductor L _s , the secondary side compensation capacitor Cs, the rectifier bridge and the load R, the secondary side resonant inductor Ls and the secondary side compensation capacitor C _s in parallel. The current output by the secondary resonant inductor Ls is rectified by the rectifier bridge and then transmitted to the load R to supply power for the load R.

The secondary circuit further includes a filter circuit, the filter circuit includes a filter capacitor C _f and a filter inductor L _f , the filter capacitor C _f is connected in parallel with the load R, and the filter inductor L _f is connected in series with the rectifier bridge to the On the power supply line of the above load R. Filter out the stray signal in the power supply to ensure the stable operation of the load.

The primary side is the energy transmitter, and the DC power supply Vin is connected in series with the inductor L _DC to form a quasi-current source. During steady-state operation, the two input inductors L ₁ and L ₂ divide the input current evenly, so that the input of the resonant network is a current-type Square wave, the amplitude is half of the current of the power supply I _d , two phase-sharing inductors L ₁ and L ₂ and the switching tubes S ₁ and S ₂ form an inverter bridge. The current square wave forms a high-frequency alternating magnetic field through the primary-side resonant network L _P and C _P , and transmits energy to the secondary-side pickup circuit through the transmitting coil L _P. The secondary side is a parallel resonant network L _S , C _S . The secondary side resonant network completes energy conversion to supply energy to the load after the rectifier bridge formed by diodes D1~D4 and the filter circuit of inductance L _f and capacitor C _f .

The high-gain energy injection type push-pull topology circuit also has at least one switch tube in series on the primary side circuit, and realizes the on-off of the inverter circuit and the resonant network by adjusting the conduction and cut-off of the switch tube.

In this embodiment, two switch tubes S ₃ and S ₄ are connected in series on the primary circuit, the switch tube S ₃ and the switch tube S ₄ are turned on and off at the same time, and when the switch tube S ₃ and the switch tube S ₄ are turned on , and only _one of the switch tube S1 and the switch tube S2 is turned _on . By arranging two switch tubes, the stability of the circuit is improved.

_In this embodiment, the duty cycle of the switch tubes S1 and S2 is D, and 0.5≦D< ₁ , and the duty cycle of the switch tubes S3 and S4 is _{1 -} D. By adjusting the duty cycle to adjust the input and output gain, the stable adjustment of the output voltage is realized.

The present invention also provides a control system for an IPT system high-gain energy injection type push-pull topology circuit, which includes the IPT system high-gain energy injection type push-pull topology circuit of the present invention and a control unit, the output of the control unit is connected to the The control terminals of the switch tube S ₁ , the switch tube S ₂ , the switch tube S ₃ and the switch tube S ₄ are connected, the control unit controls the switch tube S ₃ and the switch tube S ₄ to be turned on and off at the same time, and the switch tube S When the switching tube S3 and the switching tube _S4 are turned _on , the control unit controls the switching tube S1 and the switching tube _S2 to have _one and only one conducting.

Through the control unit, the switch tube S ₁ , switch tube S ₂ , switch tube S ₃ and switch tube S ₄ are turned on and off, control the energy injection of the system, realize high gain output, improve the power adjustment range, and regulate voltage Features.

The present invention also provides a control method for a high-gain energy injection push-pull topology circuit of an IPT system, which includes the following modes:

(1), the control unit controls the switch tubes S ₂ , S ₃ , and S ₄ to turn on, and S ₁ to turn off. The energy stored in the inductor L ₁ is transferred to the primary side resonant network through the switch tubes S ₄ and S ₃ , and the inductor L ₂ In the energy storage state, the inductor L ₁ discharges;

(2), the control unit controls the switching tubes S ₃ and S ₄ to be cut off, and controls the switching tubes S ₁ and S ₂ to be turned on, the inductors L ₁ and L ₂ are both working in the energy storage state, and the primary side resonant network is disconnected from the inverter circuit On, the primary side resonant network enters the free oscillation mode;

(3), the control unit controls the switch tubes S ₁ , S ₃ , and S ₄ to turn on, and S ₂ to turn off, and the energy stored in the inductor L ₂ is transferred to the primary side resonant network through the switch tubes S ₃ and S ₄ , and the inductor L ₁ is in the energy storage state, and the inductor L ₂ is discharged;

(4), the control unit controls the switching tubes S ₁ and S ₂ to be turned on, the switching tubes S ₃ and S ₄ are turned off, the inductors L ₁ and L ₂ are both working in the energy storage state, and the primary side resonant network is disconnected from the inverter circuit , the primary resonant network enters the free oscillation mode.

Figure 2 shows the switching tube driving sequence of the circuit shown in Figure 1 controlled by the control method of the present invention. The role of the anti-series switch tubes S3 and S4 connected to the resonant network is to control the on-off of the inverter circuit and the resonant network, thereby controlling the flow of energy. It can be seen from Fig. 2 that the driving waveforms of the switching tubes S1 and S2 are not complementary. In one switching cycle, as shown in Fig. 3, the operation of the system can be divided into the following four modes.

Mode I (t0~t1): This stage is the energy release mode, as shown in Figure 3(a). The switches S2, S3, and S4 are turned on, and S1 is turned off, and the energy stored in the inductor L1 is transferred to the resonant network through S4 and S3. While S2 is turned on, the inductor L2 is short-circuited, and the inductor L2 is in an energy storage state at this time. The inductor L1 discharges, the current iL1 gradually decreases, the inductor L2 is in the energy storage state, and the current iL2 gradually increases.

Mode II (t1~t2): This stage is the energy storage mode, as shown in Figure 3(b). The switch tubes S1 and S2 are turned on, the inductors L1 and L2 are both working in the energy storage state, and the current is in the rising state; S3 and S4 are turned off, the resonant network is disconnected from the inverter part, and the parallel resonant network enters the free oscillation mode.

Mode III (t2~t3): This stage is similar to mode I, and the energy is in the release mode, as shown in Figure 3(c). The switches S1, S3, and S4 are turned on, and S2 is turned off. The energy stored in the inductor L2 is transferred to the resonant network through S3 and S4, and the inductor current iL2 gradually decreases. While S1 is turned on, the inductor L1 is short-circuited. At this time, the inductor L1 is in an energy storage state, and the inductor current iL1 gradually rises.

Mode IV (t3~t4): This stage is the energy storage mode, as shown in Figure 3(d). The switch tubes S1 and S2 are turned on, the inductors L1 and L2 are both working in the energy storage state, and the current is in the rising state; S3 and S4 are turned off, the resonant network is disconnected from the inverter part, and the parallel resonant network enters the free oscillation mode.

The system repeats the above four modes, and controls the on-off of S1 and S2 by adjusting the conduction period of the switch tubes S3 and S4, so as to control the energy injection of the system and achieve the function of output voltage regulation.

Assuming that the resonance period of the system is T, the duty cycle of the switching tubes S1 and S2 is D, and correspondingly the duty cycle of the switching tubes S3 and S4 is (1-D). When the system works in a steady state, the currents flowing through the phase-sharing inductors L1 and L2 are equal in size, so the energy storage of the phase-sharing inductors is equal. The input and output gain of the system is analyzed based on the energy storage and release in a single phase-sharing inductor L1.

In steady state operation, the power supply current is I _d , so the current flowing through the phase-shared inductance is I _d /2, assuming that the effective value of the voltage at the input port of the resonant network is U _AB , the energy stored and released by the inductor in a period T are equal, that is:

${\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; D.</span>}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; )</span>\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; ,</span>$

Available:

${\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0.5</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

The effective value of the resonant current IP on the primary transmitting coil is:

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; /</span>\sqrt{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&omega;L</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>$

The secondary pickup voltage VS is:

V _s =ωMI _p ,

Under the resonance condition ω ² L _s C _s =1, the output voltage can be expressed as:

${\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; j\&omega;C</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}\frac{{\mathrm{<span\; class="notranslate">\; j\&omega;MU</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; B</span>}}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; j\&omega;L</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&omega;</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>$

The input and output gains are:

$<span\; class="notranslate">\; |</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&omega;MR</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; )</span>\sqrt{{<span\; class="notranslate">\; \&lsqb;</span>{\mathrm{<span\; class="notranslate">\; \&omega;L</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&alpha;\&omega;C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}<span\; class="notranslate">\; \&rsqb;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ,</span>$

Among them, α＝R _p Z _S +ω ² M ² , resonant frequency Ls is the resonant inductance of the secondary side, Cs is the compensation capacitor of the secondary side, M is the mutual inductance, R _eq = π ² R/8 is the impedance before the load is equivalent to rectification, D is the duty cycle of the switch tubes S1 and S2, and Lp is The resonant inductance of the primary side, the total impedance of the secondary side is:

Neglecting the internal resistance of the coil, it simplifies to:

${\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; \&omega;\; L</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&omega;\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; q</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; .</span>$

The input and output gain can be adjusted by adjusting the duty ratio D to realize the stable adjustment of the output voltage.

According to the input and output gain expressions, the factors affecting the system gain are resonance frequency f, resonance parameters, mutual inductance M, load impedance R, and switch duty cycle D. When a system is determined, the resonant frequency f and the load R are usually constant, so the system can adjust the input and output gains by adjusting the duty cycle D of the switch tubes S1 and S2, and also realize the regulation of the output voltage.

The most important factor of the output gain of the system lies in the load R and the duty cycle D control of the switch tube. Under different load conditions, the output gain Gain of the system increases with the increase of the duty cycle D of the switch tube. The larger the duty cycle of the switch tube, the more obvious the change rate of the output gain. When the duty cycle of the switching tubes is the same, the greater the load, the greater the output gain.

In the case of different coupling coefficients, the output gain Gain of the system increases with the increase of the duty cycle D of the switch tube. The larger the duty cycle of the switch tube, the more obvious the change rate of the output gain. When the duty cycle of the switching tubes is the same, the larger the coupling coefficient, the larger the output gain. When the coupling coefficient changes, the system can achieve higher output gain by adjusting the duty cycle, and the efficiency of the system can maintain high-efficiency operation in a larger load range, and the whole system is more suitable for light-load operation.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (9)

1. an IPT system high-gain energy injection type push-pull topology circuit, IPT system is by primary circuit and secondary circuit group Becoming, described primary circuit is provided with inductance L_DC, described inductance L_DCOne end connect DC source one pole, the other end connect inversion Bridge circuit, described inverter bridge circuit includes two brachium pontis, and the first brachium pontis includes that the first phase of series connection divides inductance L₁With switching tube S₁, Second brachium pontis includes that the second phase of series connection divides inductance L₂With switching tube S₂, primary circuit outfan respectively with former limit resonant inductance Lp Compensating electric capacity Cp with former limit to be connected, wherein, it is in parallel that described former limit resonant inductance Lp and former limit compensate electric capacity Cp, described secondary circuit Compensate electric capacity Cs, rectifier bridge and load R, described secondary resonant inductance Ls compensate with secondary including secondary resonant inductance Ls, secondary Electric capacity Cs is in parallel, is transferred to load R after the electric current rectified bridge rectification of described secondary resonant inductance Ls output, powers for load R；

It is characterized in that: in described primary circuit, be also in series with at least one switching tube, by adjust switching tube conducting with Cut-off, it is achieved inverter circuit and the break-make of resonant network.

2. IPT system high-gain energy injection type push-pull topology circuit as claimed in claim 1, it is characterised in that: described former Two switching tube S it are in series with on the circuit of limit₃And S₄, described switching tube S₃With switching tube S₄Simultaneously turn on and end, and described switch Pipe S₃With switching tube S₄During conducting, switching tube S₁With switching tube S₂Have and only one of which conducting.

3. IPT system high-gain energy injection type push-pull topology circuit as claimed in claim 2, it is characterised in that: switching tube S₁ And S₂Dutycycle be D, and 0.5≤D < 1, switching tube S₃And S₄Dutycycle be 1-D.

4. IPT system high-gain energy injection type push-pull topology circuit as claimed in claim 1, it is characterised in that: described pair Limit circuit also includes that filter circuit, described filter circuit include filter capacitor C_fWith filter inductance L_f, described filter capacitor C_fWith institute State load R in parallel, described filter inductance L_fIt is series at described rectifier bridge in the supply line of described load R.

5. IPT system high-gain energy injection type push-pull topology circuit as claimed in claim 1, it is characterised in that: input defeated Going out gain is:

$\left|\frac{V_O}{V_{in}}\right|=\frac{{\mathrm{\&omega;MR}}_{eq}}{(1-D)\sqrt{{\&lsqb;{\mathrm{\&omega;L}}_p{Z}_S+{\mathrm{\&alpha;\&omega;C}}_s{R}_{eq}\&rsqb;}^2+{(\mathrm{\&alpha;}-{\mathrm{\&omega;}}^2{L}_p{C}_s{Z}_S{R}_{eq})}^2}},$

Wherein, α=R_pZ_S+ω²M², resonant frequencyLs is secondary resonant inductance, and Cs is that secondary compensates electric capacity, and M is Mutual inductance, R_eq=π²R/8 is the impedance that load equivalent arrives before rectification, and D is the dutycycle of switching tube S1 and S2, and Lp is former limit resonance Inductance, secondary total impedance is:

Ignoring Coil resistance, abbreviation is:

$Z_s=\frac{1/R_{eq}+j(\frac{{\mathrm{\&omega;L}}_s}{R_{eq}^2}-{\mathrm{\&omega;C}}_s+{\mathrm{\&omega;}}^3{L}_s{C}_s^2)}{{\mathrm{\&omega;}}^2{C}_s^2+1/R_{eq}^2}.$

6. a control system for IPT system high-gain energy injection type push-pull topology circuit described in claim 1, its feature exists In: include the IPT system high-gain energy injection type push-pull topology circuit described in claim 1 and control unit, described control The outfan of unit and switching tube S₁, switching tube S₂, switching tube S₃With switching tube S₄Control end be connected, described control unit control Switching tube S processed₃With switching tube S₄Simultaneously turn on and end, and described switching tube S₃With switching tube S₄During conducting, described control unit Control switching tube S₁With switching tube S₂Have and only one of which conducting.

7. control system as claimed in claim 6, it is characterised in that: described switching tube S₁And S₂Dutycycle be D, and 0.5≤ D < 1, switching tube S₃And S₄Dutycycle be 1-D.

8. a control method for IPT system high-gain energy injection type push-pull topology circuit described in claim 1, its feature exists In: include following pattern:

(1), control unit controls switching tube S₂、S₃、S₄Conducting, S₁Turn off, inductance L₁The energy of middle storage passes through switching tube S₄With S₃It is delivered to former limit resonant network, inductance L₂It is in energy storage state, inductance L₁Electric discharge；

(2), control unit controls switching tube S₃、S₄Cut-off, and control switching tube S₁、S₂Conducting, inductance L₁And L₂All it is operated in energy Amount storing state, former limit resonant network disconnects with inverter circuit, former limit resonant network freedom of entry Oscillatory mode shape；

(3), control unit controls switching tube S₁、S₃、S₄Conducting, S₂Turn off, inductance L₂The energy of middle storage passes through switching tube S₃With S₄Be delivered to former limit resonant network, inductance L₁It is in energy storage state, inductance L₂Electric discharge；

(4), control unit controls switching tube S₁、S₂Conducting, switching tube S₃、S₄Turn off, inductance L₁And L₂All it is operated in energy storage State, former limit resonant network disconnects with inverter circuit, former limit resonant network freedom of entry Oscillatory mode shape.

9. control method as claimed in claim 8, it is characterised in that: described switching tube S₁And S₂Dutycycle be D, and 0.5≤ D < 1, switching tube S₃And S₄Dutycycle be 1-D.