CN109149979B - High-power voltage control type negative resistance for resonant circuit - Google Patents
High-power voltage control type negative resistance for resonant circuit Download PDFInfo
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- CN109149979B CN109149979B CN201811066873.7A CN201811066873A CN109149979B CN 109149979 B CN109149979 B CN 109149979B CN 201811066873 A CN201811066873 A CN 201811066873A CN 109149979 B CN109149979 B CN 109149979B
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- 238000010276 construction Methods 0.000 description 3
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a high-power voltage control type negative resistor for a resonant circuit, which comprises an alternating current controlled current source and a control circuit which are connected, wherein the alternating current controlled current source and the control circuit are respectively connected with the resonant circuit, the control circuit comprises a switch driving module, a zero-crossing comparison module, a phase compensation module and a voltage sampling module which are sequentially connected, the voltage sampling module samples the input voltage of the resonant circuit, the input voltage is converted into square waves which are completely opposite to the input voltage through the phase compensation module and the zero-crossing comparison module, a driving signal of a switching device is generated to the alternating current controlled current source through the switch driving module, and the alternating current controlled current source generates fundamental current between a positive output end and a negative output end according to the driving signal. The invention can realize different power levels, has the characteristics of flexible working characteristics and on-line adjustability, and provides references for the actual application of negative resistance in various power occasions.
Description
Technical Field
The invention relates to the technical field of negative resistance construction, in particular to a high-power voltage control type negative resistance for a resonant circuit.
Background
Negative resistance is a one-port active element that satisfies ohm's law. The existing negative resistance structure is mainly divided into three types: firstly, a semiconductor material is utilized to form an element with negative resistance effect; secondly, a nonlinear element (a diode, a transistor and the like) and a positive resistor are utilized to form negative resistance; and thirdly, adopting an operational amplifier and a positive resistor to form a negative impedance converter. Because the active power output by the construction method is limited, the method is generally used for a microwave radio frequency circuit to counteract positive resistance and improve the quality factor of the resonator; or used for researching dynamic behaviors such as bifurcation or chaos of a nonlinear system and the like of a nonlinear circuit. The learner has found that negative resistance is also a significant advantage for power applications, for example, the use of negative resistance can effectively improve the transmission characteristics of a wireless power transfer system. However, the existing negative resistance construction method mainly focuses on low-power negative resistance, which severely limits the application of negative resistance in high-power occasions of hundreds to kilowatts.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a high-power voltage control type negative resistor for a resonant circuit, can realize different power grades, has the characteristics of flexible working characteristics and on-line adjustability, and provides references for practical application of the negative resistor in various power occasions.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the high-power voltage control type negative resistor for the resonant circuit comprises an alternating current controlled current source and a control circuit which are connected, wherein the alternating current controlled current source and the control circuit are respectively connected with the resonant circuit, the control circuit comprises a switch driving module, a zero-crossing comparison module, a phase compensation module and a voltage sampling module which are sequentially connected, the voltage sampling module samples the input voltage of the resonant circuit, the input voltage is converted into square waves which are completely opposite to the input voltage through the phase compensation module and the zero-crossing comparison module, a driving signal of a switching device is generated to the alternating current controlled current source through the switch driving module, and fundamental wave current is generated between a positive output end and a negative output end of the alternating current controlled current source according to the driving signal.
Further, the ac controlled current source is constituted by a high-frequency current type inverter circuit capable of outputting a high-frequency ac current, which outputs a fundamental current 180 degrees out of phase with the input voltage, and outputs active power to the outside.
Furthermore, the phase compensation module can automatically adjust phase offset according to the external resonance circuit, and the voltage signal after phase compensation is always in phase with the input voltage.
Compared with the prior art, the invention has the following advantages and beneficial effects:
The high-power voltage control type negative resistance for the resonant circuit can work under the condition that the input voltage, namely the voltage at two ends of the negative resistance is high frequency, the relation between the input current and the input voltage meets the negative resistance relation at the resonant frequency of the resonant circuit, the power level of the negative resistance realized by the high-power voltage control type negative resistance power supply is determined by an alternating current controlled current source, and the efficiency of converting and outputting active power by a negative resistance active device is higher, so that the high-power voltage control type negative resistance power supply can be applied to high-efficiency application occasions with different power levels. The high-frequency current type inverter circuit is adopted as an alternating current controlled current source, and is characterized in that: firstly, high-frequency alternating voltage can be output, and the requirement of high-frequency operation of alternating negative resistance is met; secondly, the control circuits are all analog circuits, the control precision is high, the dynamic response speed is high, and a starting circuit is not needed for system vibration; thirdly, the power of the negative resistance is determined by the rated power of the high-frequency current type inverter circuit, and negative resistances with different power grades can be realized by designing the working parameters of the inverter circuit; fourth, the switching device in the high-frequency current type inverter circuit can realize zero-voltage on and off, so that the switching loss is reduced, and the overall efficiency of negative resistance operation is greatly improved; the characteristics provide references for the practical application of the negative resistance in various power occasions.
Drawings
Fig. 1 is a negative resistance model diagram provided in an embodiment.
Fig. 2 is a circuit diagram of a push-pull current type inverter for realizing negative resistance in an embodiment.
Fig. 3 is a waveform diagram of input current and control circuit signals when the circuit of fig. 2 is activated in accordance with an embodiment.
Fig. 4 is a waveform diagram of input voltage and input current at steady state of the circuit shown in fig. 2 according to an embodiment.
Detailed Description
To further illustrate the nature and the aspects of the invention, specific embodiments of the invention are described below with reference to the drawings. But the practice and protection of the invention is not limited thereto.
As shown in fig. 1, the basic principle of the high-power voltage control type negative resistance for a resonant circuit provided by the present embodiment is that the zero crossing information of the resonant voltage of the resonant circuit is used to control the output current of an ac controlled current source, so that the fundamental wave amount of the input current of the circuit is always opposite to the input voltage, the whole circuit is equivalent to a negative resistance 8, and includes an ac controlled current source 1 and a control circuit 3 connected to the resonant circuit 2, the ac controlled current source 1 and the control circuit 3 are respectively connected to the resonant circuit 2, the control circuit 3 includes a switch driving module 4, a zero crossing comparison module 5, a phase compensation module 6 and a voltage sampling module 7 connected in sequence, the voltage sampling module 7 samples the input voltage u in of the resonant circuit 2, the input voltage u in is converted into a square wave completely opposite to the input voltage u in through the phase compensation module 6 and the zero crossing comparison module 5, the drive signal of the switching device is generated to the ac controlled current source 1 through the switch driving module 4, and the ac controlled current source 1 generates the fundamental wave current i F at the port between the positive output terminal P and the negative output terminal N according to the drive signal.
In the negative resistance, the input voltage fundamental wave quantity and the input current fundamental wave quantity satisfy the following conditions as known from ohm's law:
The AC controlled current source is composed of a high-frequency current type inverter circuit capable of outputting high-frequency AC current, and can output active power outwards to meet the negative resistance characteristic. The basic working principle of the high-frequency current type inverter circuit is that an input voltage u in is converted into a switch driving signal with the same phase to drive a switch tube in the inverter circuit, so that the output fundamental wave current i F of the inverter circuit is controlled, and the input voltage u in is always opposite to the fundamental wave quantity of the input current i in at the resonance frequency of the resonant circuit.
The control circuit principle is that a voltage sampling module samples sinusoidal input voltage u in to obtain a sampled voltage signal u S, the voltage sampling module comprises an energy storage element, phases of u S and u in are offset, and u' S obtained after the phase compensation module performs phase compensation on the sampled voltage signal u S is always in phase with the input voltage u in. The sampling voltage signal u' S after phase compensation is converted into a square wave signal through a zero comparison module and is sent to a switch driving module, so that the high-frequency current type inverter circuit generates fundamental wave current i F at positive and negative output ports according to the driving signal.
In this example, the high-frequency current type inverter circuit adopts a push-pull current type inverter, as shown in fig. 2, wherein L 1、C1 and R 1 are parallel resonant circuits, S 1 and S 2 are alternately conducted 180 degrees each, The driving waveform of the switching tube S 1 is inverted to the input voltage u in, the driving waveform of the switching tube S 2 is in phase with the input voltage u in, That is, when the input voltage u in <0, the switching tube S 1 is turned on so that i in >0; When the input current u in >0, the switching tube S 2 is turned on to enable i in <0, and the switch driving module generates a sinusoidal pulse width modulation control signal according to the square wave signal u D inverted to the input voltage u in to drive the switching tube. Assuming that the inductance L dc is large enough, the current value flowing through the inductance L dc is approximately constant as I 0, the output current base quantity I F of the push-pull current type inverter is:
iF(t)＝MI0sin(ωt) (1)
Where M is the pulse width modulation ratio.
Assume that the input current fundamental wave i F is represented by phasorsThe input voltage phasors are expressed asThen there are:
The high-frequency current type inverter circuit switch tube is driven by the switch driving signal generated by the control circuit shown in fig. 1, so that the input voltage Always with input fundamental currentThe system is operated at the opposite phase, and the operating frequency is:
The corresponding negative resistance values at this time are:
RN＝-R1 (4)
As is clear from equations (3) and (4), the operating frequency and resistance of the negative resistance are related to the resonant circuit.
The basic principle of the control circuit of fig. 1 is described below in connection with a push-pull current type inverter as shown in fig. 2, which is mainly divided into four parts: the device comprises a voltage sampling module, a phase compensation module, a zero crossing comparison module and a switch driving module. When the circuit is started, a direct-current voltage source is applied to the capacitor C1, an initial driving signal u g1 of the switching tube S 1 is in positive level conduction, an initial driving signal u g2 of the switching tube S2 is in zero level disconnection, as shown in fig. 3, a loop is formed by the direct-current voltage source V dc, the inductor L dc, the L 1、C1 and the R 1 in parallel resonance branch, oscillating voltages are generated at two ends of the capacitor C 1, phase deviation exists in the voltage information u S after passing through the voltage sampling module, the voltage information u 'S after passing through the phase compensating module is always in phase with the input voltage u in, the voltage information u' S after passing through the zero comparing module is converted into square waves, and the switching driving module generates sine pulse width modulation control signals according to square wave signals and drives the switching tube of the inverter circuit.
Assuming that the input dc power voltage of the high-frequency inverter circuit is 50V, the dc inductance L dc =5mh, when the LRC parallel resonant branch is externally connected to both ends of the negative resistance, the parameters of the parallel resonant circuit are as follows: l 1＝300μH,C1＝211.11pF,R1 =100deg.C. The simulated input voltage and input current waveforms after the circuit enters steady state are shown in fig. 4. The working frequency of the negative resistance is f S =20 kHz, and the resistance value of the negative resistance is R N = -100 omega.
The embodiments described above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made in the equivalent manner, and are included in the scope of the present invention.
Claims (1)
1. A high power voltage controlled negative resistance for a resonant circuit, characterized by: the device comprises an alternating current controlled current source (1) and a control circuit (3) which are connected, wherein the alternating current controlled current source (1) and the control circuit (3) are respectively connected with a resonant circuit (2), the control circuit (3) comprises a switch driving module (4), a zero-crossing comparison module (5), a phase compensation module (6) and a voltage sampling module (7) which are sequentially connected, the voltage sampling module (7) samples the input voltage of the resonant circuit (2), the input voltage is converted into square waves which are completely opposite to the input voltage through the phase compensation module (6) and the zero-crossing comparison module (5), a driving signal of a switching device is generated by the switch driving module (4) to the alternating current controlled current source (1), and a fundamental wave current is generated between a positive output end (P) and a negative output end (N) according to the driving signal;
the alternating current controlled current source (1) is composed of a high-frequency current type inverter circuit capable of outputting high-frequency alternating current, and the high-frequency current type inverter circuit outputs fundamental wave current and input voltage which are 180 degrees different in phase and outputs active power outwards;
the phase compensation module (6) can automatically adjust phase offset according to the resonant circuit (2), and the voltage signal after phase compensation is always in phase with the input voltage;
The high-frequency current type inverter circuit adopts a push-pull current type inverter, wherein L 1、C1 and R 1 are inductance, capacitance and resistance of a parallel resonance circuit, the parallel resonance circuit is formed by connecting L 1、C1 and R 1 in parallel, The positive pole of the direct current voltage source V dc is respectively connected with one end of two inductors L dc, the negative pole is respectively connected with the source electrode of the switch tube S 1、S2, the other ends of the two inductors L dc are respectively connected with the drain electrode of the switch tube S 1、S2, The parallel resonant circuit is connected in parallel between the two inductors L dc and the switching tube S 1、S2, the switching tubes S 1 and S 2 are alternately conducted 180 degrees, The driving waveform of the switching tube S 1 is inverted to the input voltage u in, the driving waveform of the switching tube S 2 is in phase with the input voltage u in, That is, when the input voltage u in <0, the switching tube S 1 is turned on so that i in >0; When the input voltage u in is more than 0, the switching tube S 2 is turned on to enable i in to be less than 0, and the switching driving module generates a sine pulse width modulation control signal according to a square wave signal u D which is opposite to the input voltage u in so as to drive the switching tube; Assuming that the inductance L dc is large enough, the current value flowing through the inductance L dc is approximately constant as I 0, the output current base quantity I F of the push-pull current type inverter is:
iF(t)＝MI0sin(ωt) (1)
wherein M is a pulse width modulation ratio;
Suppose that the output current fundamental wave i F is represented by phasors The input voltage phasors are expressed asThen there are:
the switching tube of the high-frequency current type inverter circuit is driven by a switching driving signal generated by a control circuit, so that the input voltage phasor Always with input fundamental currentReversed phase, at this time:
At this time, the corresponding negative resistance R N is:
RN＝-R1 (4)
as can be seen from equations (3) and (4), the operating frequency and resistance of the negative resistance are related to the resonant circuit;
The control circuit is divided into four parts: the device comprises a voltage sampling module, a phase compensation module, a zero crossing comparison module and a switch driving module; when the circuit is started, a direct-current voltage source V dc is applied to a capacitor C 1, an initial driving signal u g1 of a switching tube S 1 is in positive level conduction, an initial driving signal u g2 of a switching tube S 2 is in zero level disconnection, a loop is formed by the direct-current voltage source V dc, an inductor L dc, an inductor L 1、C1 and an R 1 parallel resonance branch, two ends of the capacitor C 1 start to generate oscillating voltage, the voltage u S after passing through a voltage sampling module has phase offset, a voltage u 'S after passing through a phase compensation module is always in phase with an input voltage u in, the voltage u' S after passing through a zero comparison module is converted into square waves, and the switching driving module generates sine pulse width modulation control signals according to square wave signals and drives switching tubes of an inverter circuit.
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| CN113067465B (en) * | 2021-04-28 | 2024-05-07 | 华南理工大学 | Negative resistance based on DSP control |
| CN114696643B (en) * | 2022-03-15 | 2024-08-09 | 华南理工大学 | Negative resistance based on n-order harmonic and phase synchronous control |
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