Multi-level photon inverter based on liquid crystal module and inversion method thereof

Abstract

The invention discloses a multi-level photon inverter based on a liquid crystal module and an inversion method, and the inverter controls the luminous flux between an LED and a PV through adjusting the liquid crystal module to change the permeability of the inverter, thereby achieving the inversion output of the PV. According to the inversion method, no switching device is arranged on a main circuit, and compared with a traditional switching power supply, the multi-level photon inverter based on the liquid crystal module and the inversion method thereof have the advantages of being simple in design, wide in application field, excellent in electrical isolation performance, small in electromagnetic interference, low in output ripple, low in element power consumption and the like. According to the alternating current multi-level photon power converter, electric energy conversion from direct current to alternating current is completed, the input and output mode and the application range of the photon power converter are widened, and a multi-level generation technology fusing liquid crystal electro-optical characteristics is introduced.

Description

Technical Field

[0001] The present invention relates to the field of electric energy conversion, and in particular to a multi-level photon inverter based on a liquid crystal module and an inversion method thereof. Background Art

[0002] Traditional switching converters have problems such as large size, large output ripple and electromagnetic interference, making them difficult to use in situations requiring high-quality output; photonic transformers have high-quality power output, but can only achieve DC-DC power conversion, and cannot achieve DC input and AC output. The input and output forms are single, so they can only be used in DC situations of step-up or step-down, and it is difficult to meet the working requirements of AC output, and its scope of application is limited.

[0003] The present invention discloses a multi-level photon inverter based on a liquid crystal module and an inversion method thereof. Aiming at the problems of the existing DC-AC difficulty and high control requirements of the photon electric energy converter, a photon electric energy converter capable of realizing DC input and AC output is proposed by combining the characteristics of photoelectric materials and electrical output characteristics and the photoelectric characteristics of liquid crystal materials, and the AC form is multi-level, and a variety of levels are obtained by changing the permeability of the liquid crystal module, thereby providing a method for generating multi-levels, expanding the input and output forms of the photon electric energy converter and its application field, and having the advantages of small size, low electromagnetic interference, low output ripple, etc.

[0004] With the continuous optimization and development of light emitting diode (LED) devices and photo-electric thermal (PET) theory, photon converters convert and transmit energy through LEDs and photovoltaic elements (PV), output high-quality electric energy, and suppress harmonic distortion. They can be used in medical equipment, modern communication technology and other occasions that require high-isolation power conversion, and solve the problems of traditional switching converters such as large size, large output ripple and electromagnetic interference. In a world with energy shortages, photon power converters will become a new energy conversion technology with potential application in various fields.

[0005] The present invention discloses a multi-level photon inverter based on a liquid crystal module and an inversion method thereof. Aiming at the problems of low output voltage levels, output voltage distortion, electromagnetic interference, etc. of a traditional inverter, the multi-level photon inverter based on a liquid crystal module and an inversion method thereof combine the properties of optoelectronic materials, the optoelectronic properties of the liquid crystal module and the electrical output characteristics. Summary of the invention

[0006] The present invention discloses a multi-level photon inverter based on a liquid crystal module and an inversion method thereof. c1 , control voltage source U c2The voltage changes, changing the light flux passing through the liquid crystal module, thereby changing the illuminance of the photovoltaic element PV. It is used in the occasion of DC-AC conversion. The multi-level photon inverter based on the liquid crystal module and its inversion method combine the characteristics of photoelectric materials and electrical output characteristics, and the photoelectric characteristics of liquid crystal materials to realize the DC-AC power conversion of the photon power converter; when the control voltage of the TN liquid crystal material is V 90 c <V 10 When the voltage changes, its permeability curve tends to change linearly; it performs energy conversion and coupling, and has the advantages of small size, low electromagnetic interference, and low output ripple, thereby solving the problems of large size, large output ripple, and electromagnetic interference of traditional switching converters, and will expand the input and output forms of photon power converters and their application fields, while providing a new method for generating multi-levels. Different from traditional switching inverters, a multi-level photon power converter performs energy conversion and transmission through photons, and has the advantages of simple structure, low electromagnetic interference, low output ripple, and low component power consumption. It aims to solve the problems of traditional inverters with complex structures, low output levels, and can only achieve multi-levels by adding switching tubes, and expand the application fields of photon power converters;

[0007] The circuit unit includes: a direct current power supply DC, a first LED 1, a second LED 2, a first liquid crystal module 1, a second liquid crystal module 2, a control voltage source U c1 , control voltage source U c2 , photovoltaic element PV1, photovoltaic element PV2;

[0008] The main circuit unit includes: a direct current power supply DC, a first LED1, a second LED2, a photovoltaic element PV1, and a photovoltaic element PV2;

[0009] The auxiliary control unit includes: a first liquid crystal module 1, a second liquid crystal module 2, a control voltage source U c1 , control voltage source U c2 ;

[0010] The specific inversion method of the multi-level photon inverter based on the liquid crystal module and its inversion method is:

[0011] S1: The DC power supply DC supplies power to the first LED and the second LED, and the control voltage source U c1 , control voltage source U c2 The output voltage is V 10 , the first liquid crystal module 1 and the second liquid crystal module 2 are both in the light blocking state, the outputs of the photovoltaic elements PV1 and PV2 are both 0V, and the output voltage U oc (t) is 0 V;

[0012] ​S2: The DC power supply DC powers the first LED and the second LED, and the output voltage of the control voltage source U c1 is V 10 , and the output voltage of the control voltage source U c2 is:

[0013]

[0014] The second liquid crystal module 2 is in a light-transmitting state, and the transmittance (0 < t < π). The first liquid crystal module 1 is in a light-blocking state, and the transmittance T1(t) ≈ 0. The output voltage of the photovoltaic element PV2 is Asint, (0 < t < π), and the output of the photovoltaic element PV1 is 0V. The output voltage is

[0015] U oc (t) = Asint, (0 < t < π);

[0016] S3: The DC power supply DC powers the first LED1 and the second LED2, and the control voltage source U c1 , the control voltage source U c2 outputs a voltage of V 10 . Both the first liquid crystal module 1 and the second liquid crystal module 2 are in a light-blocking state. The outputs of the photovoltaic element PV1 and the photovoltaic element PV2 are both 0V, and the output voltage U oc (t) is 0V;

[0017] S4: The DC power supply DC powers the first LED1 and the second LED2, and the output voltage of the control voltage source U c2 is V 10 , and the output voltage of the control voltage source U c1 is:

[0018]

[0019] The second liquid crystal module 1 is in a light-transmitting state, and the transmittance (π < t < 2π). The first liquid crystal module 2 is in a light-blocking state, and the transmittance T2(t) ≈ 0. The output voltage of the photovoltaic element PV1 is Asint, (π < t < 2π), and the output of the photovoltaic element PV2 is 0V. The output voltage is

[0020] U oc (t) = Asint, (π < t < 2π);

[0021] S5: The DC power supply DC powers the first LED1 and the second LED2, and the control voltage source U c1 , the control voltage source U c2 outputs a voltage of V 10, the first liquid crystal module 1 and the second liquid crystal module 2 are both in the light blocking state, the outputs of the photovoltaic elements PV1 and PV2 are both 0V, and the output voltage U oc (t) is 0 V;

[0022] The photon energy emitted by the first LED1 and the second LED2 is a fixed value Φ v The alternating operation of the first liquid crystal module 1 and the second liquid crystal module 2 changes their own transmittance, and the photovoltaic element PV1 and the photovoltaic element PV2 alternately receive the changing photon energy, so that the output voltage produces a sinusoidal change.

[0023] It can be seen from the above technical methods that the implementation of the case of the present invention has the following beneficial effects:

[0024] The present invention discloses a multi-level photon inverter based on a liquid crystal module and an inversion method thereof, and proposes a corresponding control strategy, which changes the transmittance of the light flux transmission space by controlling the voltage at both ends of the liquid crystal module, thereby changing the received light flux of the output side PV, and is applied to the occasion of DC-AC conversion. The photon power converter uses photons as the energy transmission medium, and has the advantages of simple structure, low electromagnetic interference, low device power consumption, etc. compared with the traditional switching converter; the multi-level photon inverter based on the liquid crystal module and the inversion method thereof combine the characteristics of photoelectric materials, the electro-optical characteristics of TN liquid crystal materials and the electrical output characteristics, and use the liquid crystal module to realize the theoretical N-level output of the DC-AC power conversion of the photon power converter, where N is any positive integer greater than 1, which expands the application field of the photon power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. The technical solutions in the embodiments of the present invention will be clearly and completely described in combination with the drawings of the present invention. Obviously, the described embodiments are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the topological structure of the multi-level photon inverter based on liquid crystal module and the inversion method thereof of the present invention;

[0027] Figure 2 Schematic diagram of the working principle of a multi-level photon inverter based on a liquid crystal module and an inversion method thereof in an embodiment of the present invention;

[0028] Figure 3 It is a curve diagram of the transmittance variation of a TN liquid crystal module under different voltages of a multi-level photon inverter based on a liquid crystal module and an inversion method thereof in an embodiment of the present invention;

[0029] Figure 4 It is an inversion flow chart and input and output waveform schematic diagram of a multi-level photon inverter based on a liquid crystal module and an inversion method thereof in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to clearly illustrate the purpose, technical solutions and features of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be further described below in combination with the prior art and the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] Please refer to Figure 1 , Figure 1 The topological structure diagram of the multi-level photon inverter based on liquid crystal module and the inversion method thereof of the present invention comprises: a main circuit unit and a main control unit;

[0032] The main circuit unit includes: a direct current power supply DC, a first LED1, a second LED2, a photovoltaic element PV1, and a photovoltaic element PV2, and the specific connection method is:

[0033] The positive electrode of the direct current power supply DC is connected to the positive electrodes of the first LED 1 and the second LED 2;

[0034] The cathode of the direct current power supply DC is connected to the cathodes of the first LED 1 and the second LED 2;

[0035] The first LED1 and the second LED2 are connected in parallel;

[0036] The photovoltaic elements PV1 and PV2 are both composed of N PV elements connected in series;

[0037] The output side photovoltaic PV1 includes photovoltaic elements: photovoltaic element PV 11 、Photovoltaic elements PV 12 、...、Photovoltaic element PV 1n ;

[0038] The output side photovoltaic PV2 includes photovoltaic elements: photovoltaic element PV 21 、Photovoltaic elements PV 22 、...、Photovoltaic element PV 2n ;

[0039] The photovoltaic element PV 11 The positive electrode and the photovoltaic element PV 21 The negative connection of

[0040] The photovoltaic element PV 11 The negative electrode and the photovoltaic element PV 12 The positive connection of the photovoltaic element PV 12 The negative electrode and the photovoltaic element PV 13 The positive electrode of the photovoltaic element PV 1(n-1) The negative electrode and the photovoltaic element PV 1n The positive connection of

[0041] The photovoltaic element PV 1n The negative electrode and the photovoltaic element PV 2n The positive connection of

[0042] The photovoltaic element PV 21 The positive electrode and the photovoltaic element PV 22 The negative pole of the photovoltaic element PV 22 The positive electrode and the photovoltaic element PV 23 The negative pole of the photovoltaic element PV 2(n-1) The positive electrode and the photovoltaic element PV 2n The negative connection of

[0043] The auxiliary control unit includes: a first liquid crystal module 1, a second liquid crystal module 2, a control voltage source U c1 , control voltage source U c2 ;

[0044] The control voltage source U c1 The first end is connected to the positive electrode of the first liquid crystal module 1, and the control voltage source U c1 The second end is connected to the negative electrode of the first liquid crystal module 1;

[0045] The control voltage source U c2 The first end is connected to the positive electrode of the second liquid crystal module 2, and the control voltage source U c2 The second end is connected to the negative electrode of the second liquid crystal module 2 .

[0046] Preferably, the liquid crystal module is a TN type liquid crystal module;

[0047] Preferably, the first LED1 and the second LED2 are 845nm infrared light LEDs;

[0048] Please refer to Figure 1 , Figure 1 The schematic diagram of the working principle of the multi-level photon inverter based on liquid crystal module and the inversion method thereof of the present invention is combined with Figure 3 TN liquid crystal electro-optical characteristic curve, Figure 4Flowchart and working waveform analysis of the DC-AC photon power converter described in this article. The specific inverter method is as follows:

[0049] S1: Figure 2 (a) The DC power supply DC supplies power to the first LED1 and the second LED2. The output voltages of the control voltage source U c1 and the control voltage source U c2 are both V 10 . The first liquid crystal module 1 and the second liquid crystal module 2 are both in the light-blocking state. The outputs of the photovoltaic elements PV1 and PV2 are both 0V, and the output voltage U oc (t) is 0V;

[0050] S2: Figure 2 (b) The DC power supply DC supplies power to the first LED1 and the second LED2. The output voltage of the control voltage source U c1 is V 10 . The output voltage of the control voltage source U c2 is:

[0051]

[0052] The second liquid crystal module 2 is in the light-transmitting state, and the transmittance (0 < t < π). The first liquid crystal module 1 is in the light-blocking state, and the transmittance T1(t) ≈ 0. The output voltage of the photovoltaic element PV2 is Asint, (0 < t < π), and the output of the photovoltaic element PV1 is 0V. The output voltage is

[0053] U oc (t) = Asint, (0 < t < π);

[0054] S3: Figure 2 (a) The DC power supply DC supplies power to the first LED1 and the second LED2. The output voltages of the control voltage source U c1 and the control voltage source U c2 are V 10 . The first liquid crystal module 1 and the second liquid crystal module 2 are both in the light-blocking state. The outputs of the photovoltaic elements PV1 and PV2 are both 0V, and the output voltage U oc (t) is 0V;

[0055] S4: Figure 2 (c) The DC power supply DC supplies power to the first LED1 and the second LED2. The output voltage of the control voltage source U c2 is V 10 . The output voltage of the control voltage source U c1 is:

[0056]

[0057] The second liquid crystal module 1 is in a light-transmitting state, and the light transmittance (π < t < 2π), the first liquid crystal module 2 is in a light-blocking state, the light transmittance T2(t) ≈ 0, the output voltage of the photovoltaic element PV1 is Asint, (π < t < 2π), the output of the photovoltaic element PV2 is 0V, and the output voltage is

[0058] U oc (t) = Asint, (π < t < 2π);

[0059] S5: Figure 2 (a) The DC power supply DC supplies power to the first LED1 and the second LED2, and the control voltage source U c1 and the control voltage source U c2 outputs a voltage of V 10 . The first liquid crystal module 1 and the second liquid crystal module 2 are both in a light-blocking state, the outputs of the photovoltaic element PV1 and the photovoltaic element PV2 are both 0V, and the output voltage U oc (t) is 0V.

Claims

1. A multi-level photon inverter topology based on a liquid crystal module, characterized in that: include: Main circuit unit and main control unit; The circuit unit includes: a direct current power supply DC, a first LED 1, a second LED 2, a first liquid crystal module 1, a second liquid crystal module 2, a control voltage source U c1 , control voltage source U c2 , photovoltaic element PV1, photovoltaic element PV2; The positive electrode of the direct current power supply DC is connected to the positive electrodes of the first LED 1 and the second LED 2; The cathode of the direct current power supply DC is connected to the cathodes of the first LED 1 and the second LED 2; The first LED1 and the second LED2 are connected in parallel; The photovoltaic elements PV1 and PV2 are both composed of N PV elements connected in series; The output side photovoltaic PV1 includes photovoltaic elements: photovoltaic element PV 11 、Photovoltaic elements PV 12 、...、Photovoltaic element PV 1n ; The output side photovoltaic PV2 includes photovoltaic elements: photovoltaic element PV 21 、Photovoltaic elements PV 22 、...、Photovoltaic element PV 2n ; The photovoltaic element PV 11 The positive electrode and the photovoltaic element PV 21 The negative connection of The photovoltaic element PV 11 The negative electrode and the photovoltaic element PV 12 The positive connection of the photovoltaic element PV 12 The negative electrode and the photovoltaic element PV 13 The positive electrode of the photovoltaic element PV 1(n-1) The negative electrode and the photovoltaic element PV 1n The positive connection of The photovoltaic element PV 1n The negative electrode and the photovoltaic element PV 2n The positive connection of The photovoltaic element PV 21 The positive electrode and the photovoltaic element PV 22 The negative pole of the photovoltaic element PV 22 The positive electrode and the photovoltaic element PV 23 The negative pole of the photovoltaic element PV 2(n-1) The positive electrode and the photovoltaic element PV 2n The negative connection of The control voltage source U c1 The first end is connected to the positive electrode of the first liquid crystal module 1, and the control voltage source U c1 The second end is connected to the negative electrode of the first liquid crystal module 1; The control voltage source U c2 The first end is connected to the positive electrode of the second liquid crystal module 2, and the control voltage source U c2 The second end is connected to the negative electrode of the second liquid crystal module 2 .

2. The multi-level photon inverter based on liquid crystal module and its inversion method and inversion method according to claim 1, characterized in that: Using the topology of the multi-level photon inverter based on the liquid crystal module and the inversion method thereof as claimed in claim 1, the modulation method includes the following steps: S1: the first liquid crystal module 1 and the second liquid crystal module 2 are both in a completely light-blocking state, and the photovoltaic elements PV1 and PV2 are both not working; S2: The first liquid crystal module 1 is in a light-blocking state, the second liquid crystal module 2 is in a light-transmitting state, and the transmittance of the input-side liquid crystal module 2 changes with the control voltage source U c2 The photovoltaic element PV1 does not work, and the photovoltaic element PV2 works; S3: the first liquid crystal module 1 and the second liquid crystal module 2 are both in a completely light-blocking state, and the photovoltaic elements PV1 and PV2 are both not working; S4: The second liquid crystal module 2 is in a light-blocking state, the first liquid crystal module 1 is in a light-transmitting state, and the transmittance of the first liquid crystal module 1 changes with the control voltage source U c1 The photovoltaic element PV2 does not work, and the output side photovoltaic element PV1 works; S5: The first liquid crystal module 1 and the second liquid crystal module 2 are both in a completely light-blocking state, and the photovoltaic elements PV1 and PV2 are not working.

3. The output mode of the multi-level photon inverter and the inversion method based on the liquid crystal module according to claim 2, characterized in that: S1: The output result is 0; S2: The photovoltaic element PV2 works and outputs an AC multi-level positive half cycle. The number of levels changes according to the change of the transmittance of the second liquid crystal module 2. The output voltage is an AC multi-level positive half cycle, U oc (t) The output sine wave of the first half cycle is: Where T emp is the absolute temperature, q is the elementary charge, K is the Boltzmann constant, I a is the reverse saturation current of photovoltaic element PV1 and photovoltaic element PV2, T1(t) is the transmittance of liquid crystal module 1, k ph is the photocurrent coefficient; S3: The output result is 0; S4: The photovoltaic element PV1 works and outputs an AC multi-level negative half cycle. The number of levels changes according to the sinusoidal change of the transmittance of the input-side liquid crystal module 1. The output voltage AC multi-level negative half cycle U oc (t) The output sine wave in the second half cycle is: Where T emp is the absolute temperature, q is the elementary charge, K is the Boltzmann constant, I a is the reverse saturation current of output side PV1 and output side PV2, T2(t) is the transmittance of liquid crystal module 2, k ph is the photocurrent coefficient; S5: The output result is 0.

4. The liquid crystal module modulation method of the multi-level photon inverter and the inversion method based on the liquid crystal module according to claim 3, characterized in that: S1: The output result of the transmittance T(t) of the liquid crystal module 1 and the liquid crystal module 2 is 0; S2: The transmittance T1(t) of the liquid crystal module 1 is 0, and the transmittance T2(t) of the liquid crystal module 2 is expressed as follows: Where T emp is the absolute temperature, q is the elementary charge, K is the Boltzmann constant, I a is the reverse saturation current of output side PV1 and output side PV2, k ph is the photocurrent coefficient, S is the surface area of ​​an LED unit; S3: The output result of the transmittance T(t) of the liquid crystal module 1 and the liquid crystal module 2 is 0; S4: The transmittance T1(t) of the liquid crystal module 2 is 0, and the transmittance T1(t) of the liquid crystal module 1 is as follows: Where T emp is the absolute temperature, q is the elementary charge, K is the Boltzmann constant, I a is the reverse saturation current of output side PV1 and output side PV2, k ph is the photocurrent coefficient, S is the surface area of ​​an LED unit; S5: The transmittance T(t) output result of the liquid crystal module 1 and the liquid crystal module 2 is 0.

5. The control voltage source U of the multi-level photon inverter and the inversion method based on the liquid crystal module according to claim 4 c Modulation mode, when V 90 c <V 10 When the permeability T1(t) is proportional to the control voltage U c A linear relationship is characterized by:​ S1: The control voltage source U c1 , control voltage source U c2 The output results are V 10 ; S2: The control voltage source U c1 V 10 , the control voltage source U c2 The formula is: Where V 90 is the voltage value when the transmittance of the liquid crystal module reaches 90%, V 10 is the voltage value when the transmittance of the liquid crystal module reaches 10%; S3: The control voltage source U c1 , control voltage source U c2 The output results are V 10 ; S4: The control voltage source U c2 V 10 , the control voltage source U c1 The formula is: Where V 90 is the voltage value when the transmittance of the liquid crystal module reaches 90%, V 10 is the voltage value when the transmittance of the liquid crystal module reaches 10%; S5: The control voltage source U c1 , control voltage source U c2 The output results are V 10 .

Images