NL2017409B1

NL2017409B1 - An electrical converter, a method and a computer program product

Info

Publication number: NL2017409B1
Application number: NL2017409A
Authority: NL
Inventors: Anatol’Evic Guzyeyev Valeriy
Original assignee: Dutch Infinity Energy D I E B V
Priority date: 2016-09-02
Filing date: 2016-09-02
Publication date: 2018-03-09

Description

Octrooicentrum

Nederland

Θ 2017409

BI OCTROOI (51) Int. CL:

H02M 1/00 (2017.01) H02M 7/48 (2017.01) H02M 7/497 (2017.01) (21) Aanvraagnummer: 2017409 © Aanvraag ingediend: 02/09/2016

Aanvraag ingeschreven:	(73) Octrooihouder(s):
09/03/2018	Dutch Infinity Energy (D.I.E.) B.V.
	te Noordwijk.
(43) Aanvraag gepubliceerd:
	(72) Uitvinder(s):
(47) Octrooi verleend:	Valeriy Anatol’evic Guzyeyev te Noordwijk.
09/03/2018
(45) Octrooischrift uitgegeven:	θ Gemachtigde:
19/03/2018	ir. C.M. Jansen c.s. te Den Haag.

54) An electrical converter, a method and a computer program product

The invention relates to an electrical converter, comprising a DC-AC converter provided with a DC input port, an AC output port and a controller controlling a frequency of an electric signal provided at the AC output port. Further, the electrical converter comprises a source coil connected to the AC output port, and a reversely oriented load coil positioned in proximity to the source coil such that the source coil and the load coil are coupled via a resonance capacitor.

NL BI 2017409

Dit octrooi is verleend ongeacht het bijgevoegde resultaat van het onderzoek naar de stand van de techniek en schriftelijke opinie. Het octrooischrift komt overeen met de oorspronkelijk ingediende stukken.

P112812NL00

Title: An electrical converter, a method and a computer program product

The invention relates to an electrical converter.

Electrical converters are generally known for a wide area of applicants, e.g. for converting electrical DC energy towards electrical AC energy or vice versa. Further, AC to AC converters are known, also known as transformers, for increasing or reducing AC levels.

It is an object of the invention to provide an electrical converter that may generate a specific electrical output signal, e.g. an electrical AC signal having a desired frequency. Thereto, an electrical converter is provided, comprising a DC-AC converter provided with a DC input port, an AC output port and a controller controlling a frequency of an electric signal provided at the AC output port, further comprising a source coil connected to the AC output port, and a reversely oriented load coil positioned in proximity to the source coil such that the source coil and the load coil are coupled via a resonance capacitor.

By including a DC-AC converter generating an AC signal that is transferred from a source coil to a reversely oriented load coil positioned in proximity to the source coil such that the source coil and the load coil are coupled via a resonance capacitor, a desired electrical output signal can be provided.

The invention also relates to a method.

Further, the invention relates to a computer program product. A computer program product may comprise a set of computer executable instructions stored on a data carrier, such as but not limited to a flash memory, a CD or a DVD. The set of computer executable instructions, which allow a programmable computer to carry out the method as defined above, may also be available for downloading from a remote server, for example via the Internet, e.g. as an app.

Other advantageous embodiments according to the invention are described in the following claims.

By way of example only, embodiments of the present invention will now be described with reference to the accompanying figures in which

Fig. 1 shows a system view of a first embodiment of an electrical converter according to the invention;

Fig. 2a shows a system view of a second embodiment of an electrical converter according to the invention;

Fig. 2b shows a system view of a third embodiment of an electrical converter according to the invention, and

Fig. 3 shows a schematic view of a source coil and a load coil of an electrical converter according to the invention.

The figures merely illustrate a preferred embodiments according to the invention. In the figures, the same reference numbers refer to equal or corresponding parts.

Figure 1 shows a system view of a first embodiment of an electrical converter 1 according to the invention. The converter 1 includes a DC-AC converter 2, a source coil 3 and a load coil 4.

The DC-AC converter 2 has a DC input port 5, an AC output port 20 6 and a controller 7 controlling a frequency of an electric signal that is generated at the AC output port 6. In the shown embodiment, the DC input port 5 has a first input terminal 5a and a second input terminal 5b. Similarly, the AC output port 6 has a first output terminal 6a and a second output terminal 6b.

The source coil 3 is connected to the AC output port 6. In the shown embodiment, the source coil 3 has a first terminal 3a and a second terminal 3b. The first source coil terminal 3a is connected to the first output terminal 6a of the DC-AC converter 2 and the second source coil terminal 3b is connected to the second output terminal 6b of the DC-AC converter 2.

The load coil 4 is reversely oriented relative to the orientation of the source coil 3. Further, the load coil 4 is positioned in proximity to the source coil such that the source coil 3 and the load coil 4 are coupled via a resonance capacitor 8. The load coil 4 has a first terminal 4a and a second terminal 4b.

The source coil 3, the load coil 4 and the resonance capacitor 8 form a resonance circuit. During operation, voltage and current signals in the resonance spectrum of said resonance circuit are dominant over signals in a spectrum outside said resonance spectrum. Then, the electrical signal that is generated by the DC-AC converter 2 is controlled such that its frequency is within the resonance spectrum of the resonance circuit, and preferably matches a resonance frequency of the resonance circuit. In practice, the frequency of the electric signal can be automatically controlled by generating a signal having a broad spectrum including said resonance spectrum determined by the resonance circuit. Then, the resonance circuit acts as a bandpass filter so that electric signals within the resonance spectrum dominate signals having a frequency outside said resonance spectrum. The combination of the DC-AC converter 2 and the resonance circuit then control the frequency of the generated signal.

In the shown embodiment, the load coil 4 is implemented as a first load coil Lxl that is connected with a load 9 having a low impedance such as a heater, e.g. an immersion heater or cooker. The impedance can be mainly resistive. In the shown embodiment, the first terminal 4a of the load coil 4 is connected to a first terminal 9a of the load 9, while the second terminal 4b of the load coil 4 is connected to a second terminal 9b of the load

9.

In Fig. 1 it is also shown that the load coil 4 can be implemented as a second load coil Lx2, also connected with a load, similar to the load connected to the first load coil Lxi. Here, the load is implemented as a light source 10.

It is noted that, in principle, multiple loads can be applied, e.g. by connected multiple loads to the load coil 4, in series and/or in parallel. Further, multiple load coils could be used, each load coil being connected to a single or multiple number of loads.

The resonance capacitor has a capacitance value in a range from circa 1000 pF to circa 10.000 pF, preferably in a range from circa 1000 pF to circa 4700 pF.

During operation of the electrical converter 1 an electrical DC signal is provided to the DC-AC converter 2, e.g. using a 12 V or 24 V, 10 A signal. Generally, the electrical DC signal is variable. In particular, the voltage of the electrical DC signal can then be set to a desired voltage level. The DC-AC converter 2 converts the DC signal into an electrical AC signal having a controlled frequency, and feeds said AC signal towards the source coil 3 that interacts with the load coil 4. Then, an electrical signal is provided to a load 9, 10.

Generally, the capacitance value of the resonance capacitor 8 may depend on the mutual position and orientation of the source coil 3 and the load coil 4, the frequency of the electrical AC signal that is generated by the DC-AC converter 2, a frequency of the electrical AC signal at the load 8 and/or a type of load 8.

Generally, the resonance capacitor 8 may have a capacitance value in a range from circa 1000 pF to circa 10.000 pF. Further, the controller of 7 the DC-AC converter 2 may be arranged for setting the frequency of the electric signal provided at the AC output port 6 in a range from circa 10 kHz to circa 200 kHz.

Figure 2a shows a system view of a second embodiment of an electrical converter 1 according to the invention. Here, the converter 1 includes an AC-DC converter 11 for converting electrical AC mains energy into electrical DC energy for feeding the DC-AC converter 2. The AC-DC converter 11 includes an input port 12 and an output port 13. In the shown embodiment, the input port 12 includes a first input terminal 12a and a second input terminal 12b. Similarly, the output port 13 includes a first output terminal 13a and a second input terminal 13b. The first output terminal 13a is connected to the first input terminal 5a of the DC-AC converter 2, and the second output terminal 13b is connected to the second input terminal 5b of the DC-AC converter 2. The input terminal 12a,b can be connected to mains terminals of an AC electrical energy source e.g. 230 VAC.

It is noted that the embodiment shown in Fig. 1 can also be provided with an AC-DC converter 11 as shown in Fig. 2a.

Further, the embodiment shown in Fig. 2a has another load configuration. Here, the converter 1 comprises a load transformer 14 and a mains transformer 15. Both the load transformer 14 and the mains transformer 15 have an input port 16; 18 and an output port 17; 19. The input port 16 of the load transformer 14 has a first and second input terminal 16a,b, while the output port 17 of the load transformer 14 also has a first and a second terminal 17a,b.

In the shown embodiment, the first input terminal 16a of the load transformer 14 is connected to the first terminal 4a of the load coil 4, and the second input terminal 16b of the load transformer 14 is connected to the second terminal 4b of the load coil 4. Then, the input port 16 of the load coil 4 is connected to the load coil 4. Further, in the shown embodiment, the first output terminal 17a of the load transformer 14 is connected to the first output terminal 19a of the main transformer 15. Then, the output port 17 of the load transformer 14 is connected to the output port 19 of the mains transformer 15 for setting a frequency of an electrical signal at the output port 17 of the load transformer 14.

The input terminals 18a,b of the mains transformer 15 can be connected to mains terminals of an AC electrical energy source e.g. 230

VAC. Further, the mains transformer 15 can be arranged for transforming the input voltage and current to a same level, i.e. also to 230 VAC.

In the shown embodiment, the second output terminal 17b of the load transformer 17 forms a first AC output terminal 22b of the electrical converter 1, while the second output terminal 19b of the mains transformer 15 forms a second AC output terminal 22a of the electrical converter 1.

Further, in the shown embodiment, the converter 1 further includes a load capacitor 20 arranged parallel to the first and second AC output terminals 17b, 19b. As an example, the load capacitor 20 has a capacitance value of circa 22 microF arranged for being subjected to a voltage of circa 400 VAC. It is noted that the load capacitor 20 may have other characteristics, e.g. depending on a desired load type.

Figure 2b shows a system view of a third embodiment of an electrical converter 1 according to the invention. Again, the DC-AC converter 2 is fed by a DC source, at the first and second input terminals 5a,b. Further, the system 1 includes a DC-AC converter 21 having a first input terminal 5e and a second input terminal 5f, and a first output terminal 19a and a second output terminal 19b. The DC-AC converter 21 is fed by the DC source, at its first and second input terminals 5e,f, and generates an AC signal, at its first and second output terminals 19a,b that replace the output terminals 19a,b of the mains transformer 15 in the embodiment shown in Fig. 2a.

Figure 3 shows a schematic view of a source coil 3 and a load coil 4 of an electrical converter 1 according to the invention. As shown, the orientation of the source coil 3 and the load coil 4 is opposite. Further, the resonance capacitor 8 between the coils 3, 4 may have a parasitic character. Then, there is no discrete or integrated capacitor element included in the structure of the converter 1. However, in principle, a discrete resonance capacitor may be added to contribute to the capacitance between the coils 3,

4. Generally, the source coil 3 and the load coil 4 are located such that they are coupled via said resonance capacitor 8. The capacitance value of the capacitor 8 can be influenced by setting a specific location of the coils 3, 4 relative to each other. In the shown embodiment, the source coil 3 and the load coil 4 have substantially coinciding rotational symmetry axes.

However, the load coil 4 might have another position and/or orientation, e.g. shifted along the symmetry axis of the source coil 3 or shifted in a direction transverse to said source coil symmetry axis. The source coil 3 and the load coil 4 may have a specific inductance, preferably less than circa 200 micro Henry.

According to an aspect of the invention, a method is provided for controlling operation of an electrical converter comprising a DC-AC converter provided with a DC input port, an AC output port, a source coil connected to the AC output port, and a reversely oriented load coil positioned in proximity to the source coil such that the source coil and the load coil are coupled via a resonance capacitor. The method comprises a step of controlling a frequency of an electric signal provided at the AC output port.

The method for controlling operation of an electrical converter can be performed using dedicated hardware structures, such as FPGA and/or

ASIC components. Otherwise, the method can also at least partially be performed using a computer program product comprising instructions for causing a controller, a processor of a computer system or a control unit to perform the above described step of the method according to the invention, or at least a sub-step of receiving feedback data from a measured resonance capacitor voltage.

All steps can in principle be performed on a single processor. However, it is noted that at least one sub-step can be performed on a separate processor. A processor can be loaded with a specific software module. Dedicated software modules can be provided.

The invention is not restricted to the embodiments described herein. It will be understood that many variants are possible.

These and other embodiments will be apparent for the person skilled in the art and are considered to fall within the scope of the invention as defined in the following claims. For the purpose of clarity and a concise description features are described herein as part of the same or separate embodiments. However, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features described.

Claims

Conclusies

1. Elektrische omzetter, omvattende een gelijkstroom naar wisselstroom omzetter voorzien van een gelijkstroom invoeraansluiting, een wisselstroom uitvoeraansluiting en een regelaar die een frequentie van een elektrisch signaal regelt die bij de wisselstroom uitvoeraansluiting wordt

5 verschaft, voorts omvattende een bronspoel die is verbonden met de wisselstroom uitvoeraansluiting, en een omgekeerd georiënteerde belastings-spoel die in de nabijheid van de bronspoel is opgesteld zodanig dat de bronspoel en de belastings-spoel via een resonantiecondensator zijn gekoppeld.

10 2. Elektrische omzetter volgens conclusie 1, waarbij de belastingsspoel is verbonden met een lage impedantie belasting.

3. Elektrische omzetter volgens conclusie 1, voorts omvattende een belastingstransformator en een voedingstransformator, waarbij elke transformator is voorzien van een invoeraansluiting en een

15 uitvoeraansluiting, waarbij de invoeraansluiting van de belastingstransformator is verbonden met de belastings-spoel en de uitvoeraansluiting van de belastingstransformator is verbonden met de uitvoeraansluiting van de voedingstransformator voor instelling van een frequentie van een elektrisch signaal bij de uitvoeraansluiting van de

20 belastingstransformator.

4. Elektrische omzetter volgens conclusie 3, waarbij de uitvoeraansluiting van de belastingstransformator en de uitvoeraansluiting van de voedingstransformator elk een eerste uitvoeraansluitpunt en een tweede uitvoeraansluitpunt, waarbij het eerste uitvoeraansluitpunt van de

25 belastingstransformator is verbonden met een eerste aansluitpunt van de uitvoeraansluiting van de belastingstransformator en het tweede uitvoeraansluitpunt van de belastingstransformator een eerste wisselstroom uitvoeraansluitpunt van de elektrische omzetter, en waarbij het tweede uitvoeraansluitpunt van de voedingstransformator een tweede wisselstroom uitvoeraansluitpunt van de elektrische omzetter vormt.

5 5. Elektrische omzetter volgens één der voorgaande conclusies, waarbij de resonantiecondensator een capaciteitswaarde heeft in een bereik van ongeveer 1000 pF tot ongeveer 10.000 pF.

6. Elektrische omzetter volgens één der voorgaande conclusies, voorts omvattende een gelijkstroom naar wisselstroom omzetter voor het omzetten

10 van elektrische wisselstroom voedingsenergie in elektrische gelijkstroom energie voor voeding van de gelijkstroom naar wisselstroom omzetter.

7. Elektrische omzetter volgens één der voorgaande conclusies, waarbij de bronspoel, de belastings-spoel en de resonantiecondensator een resonantieschakeling vormen.

15 8. Elektrische omzetter volgens één der voorgaande conclusies, waarbij de regelaar van de gelijkstroom naar wisselstroom omzetter is ingericht voor het instellen van de frequentie van het elektrische signaal dat bij de wisselstroom uitvoeraansluiting wordt verschaft in een bereik van ongeveer 10 kHz tot ongeveer 200 kHz.

20 9. Werkwijze voor het regelen van de werking van een elektrische omzetter omvattende een gelijkstroom naar wisselstroom omzetter voorzien van een gelijkstroom invoeraansluiting, een wisselstroom uitvoeraansluiting, een bronspoel die is verbonden met de wisselstroom uitvoeraansluiting, en een omgekeerd georiënteerde belastings-spoel die in

25 de nabijheid van de bronspoel is opgesteld zodanig dat de bronspoel en de belastings-spoel via een resonantiecondensator zijn gekoppeld, waarbij de werkwijze de stap omvat van het regelen van een frequentie van een elektrisch signaal dat bij de wisselstroom uitvoeraansluiting wordt verschaft.

10. Werkwijze volgens conclusie 9, waarbij de frequentie wordt geregeld door een spanning op de resonantiecondensator als invoer te

5 gebruiken.

11. Computer programma product voor het regelen van de werking van een elektrische omzetter omvattende een gelijkstroom naar wisselstroom omzetter voorzien van een gelijkstroom invoeraansluiting, een wisselstroom uitvoeraansluiting, een bronspoel die is verbonden met de

10 wisselstroom uitvoeraansluiting, en een omgekeerd georiënteerde belastings-spoel die in de nabijheid van de bronspoel is opgesteld zodanig dat de bronspoel en de belastings-spoel via een resonantiecondensator zijn gekoppeld, waarbij het computer programma product voor een computer leesbare code omvat dat een processor in staat stelt een stap uit te voeren

15 van het regelen van een frequentie van een elektrisch signaal dat bij de wisselstroom uitvoeraansluiting wordt verschaft.

1/4 ,+ I
2/4

Fig. 2A
3/4

Fig. 2B
4/4