Ultraviolet ballast high-frequency signal measuring circuit

Abstract

The utility model discloses an ultraviolet ballast high-frequency signal measuring circuit, which comprises a first voltage dividing module, a second voltage dividing module and an ADC (analog to digital converter) detection module, and is characterized in that the first voltage dividing module is connected with the second voltage dividing module, and the second voltage dividing module is connected with the ADC detection module; the first voltage division module is used for receiving a first signal output by an ultraviolet ballast and performing voltage division on the first signal to obtain a second signal, the first signal is a non-sinusoidal alternating current signal, and the voltage of the second signal is smaller than that of the first signal; the second voltage dividing module is used for receiving the second signal and converting the second signal into a third signal, the third signal is direct-current positive voltage, and the voltage of the third signal is smaller than that of the second signal; and the ADC detection module is used for detecting and analyzing the third signal to finally obtain an accurate detection result.

Description

Technical Field

[0001] The utility model relates to a high-frequency signal measuring circuit, in particular to a high-frequency signal measuring circuit for an ultraviolet ballast. Background Art

[0002] According to electromagnetic theory, the size and weight of an electrical product are inversely proportional to the square root of its power supply frequency. Therefore, increasing the switching frequency can significantly reduce the size and weight of a power supply, making it more compact. High-frequency operation also reduces switching losses, especially through soft-switching techniques that achieve zero-voltage or zero-current switching, further improving energy efficiency.

[0003] As a switching power conversion technology product, UV ballasts have a high switching frequency. However, the UV ballast output is a high-frequency, non-sinusoidal AC signal. The control circuit needs to be able to accurately measure this high-frequency signal to reflect the output change and use it for control system adjustment. However, the speed of current digital signal processors, combined with the processing time after sampling, makes it impossible to accurately measure the high-frequency, non-sinusoidal AC information output by UV ballasts. Therefore, a solution that can accurately measure UV non-sinusoidal high-frequency signals is urgently needed. Utility Model Content

[0004] In view of the above problems, the present invention provides a measurement circuit that can accurately measure the high-frequency signal of an ultraviolet ballast, including: a first voltage divider module, a second voltage divider module and an ADC detection module, the first voltage divider module is connected to the second voltage divider module, and the second voltage divider module is connected to the ADC detection module; the first voltage divider module is used to receive a first signal output by the ultraviolet ballast and divide the first signal to obtain a second signal, the first signal is a non-sinusoidal AC signal, and the voltage of the second signal is less than the voltage of the first signal; the second voltage divider module is used to receive the second signal and convert it into a third signal, the third signal is a DC positive voltage and the voltage of the third signal is less than the voltage of the second signal; the ADC detection module is used to detect and analyze the third signal to obtain a final detection result.

[0005] In some embodiments, the first voltage divider module is a capacitor voltage divider network, and the capacitor voltage divider network includes a capacitor and a transformer.

[0006] In some embodiments, the second voltage divider module is a resistor voltage divider network and an amplitude conversion module, the resistor voltage divider network is used to divide the second signal, and the amplitude conversion module is used to bias the positive and negative polarity of the voltage of the divided second signal into a DC positive signal, and the DC positive signal is the third signal.

[0007] In some embodiments, the capacitor voltage divider network includes at least a plurality of first capacitors connected in series and a plurality of second capacitors connected in series, the plurality of first capacitors are connected in parallel with the plurality of second capacitors and in series with a third capacitor, a fourth capacitor is connected in series with a coil on one side of a transformer, and a branch formed by the fourth capacitor and the coil on one side of the transformer is connected in parallel with the third capacitor.

[0008] In some embodiments, the resistor divider network includes at least a first resistor, a second resistor, and a third resistor, which are connected in series and are connected to the other side coil of the transformer.

[0009] In some embodiments, the amplitude conversion module includes an operational amplifier, the negative input port of the operational amplifier is connected to the output port, the positive input port of the operational amplifier is connected to the connection point of the second resistor and the third resistor, one end of the operational amplifier is grounded, and the other end is connected to the positive power supply, the side connected to the positive power supply is connected to the fifth capacitor, the fifth capacitor is grounded, the operational amplifier is connected to the fourth resistor and the sixth capacitor, the sixth capacitor is grounded, and the connection point between the fourth resistor and the fifth capacitor outputs the third signal.

[0010] In some embodiments, the voltage of the forward power supply is 5V.

[0011] In some embodiments, the third signal is a DC positive voltage with a voltage less than 3.3V.

[0012] The technical solution of the embodiment of the utility model uses two voltage-dividing and step-down circuits and converts the level to a DC positive level, which is biased to a DC level to ensure that no negative voltage is generated, so as to adapt to the detection of the ADC detection module, and ultimately obtains an accurate detection result of the high-frequency signal of the ultraviolet ballast. This measurement circuit not only enables the high-frequency signal to be accurately measured, but also has a simple and stable measurement circuit structure.

[0013] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0015] Figure 1This is a circuit structure diagram of a high-frequency signal measurement circuit for an ultraviolet ballast in some embodiments of the present invention.

[0016] The accompanying drawings in the specific implementation manner are as follows:

[0017] A first capacitor 11, a second capacitor 12, a third capacitor 13, a fourth capacitor 14, and a transformer 15;

[0018] A first resistor 21, a second resistor 22, and a third resistor 23;

[0019] Operational amplifier 31 , fifth capacitor 32 , fourth resistor 33 , and sixth capacitor 34 . DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this invention; the terms "including" and "having" and any variations thereof in the specification and claims of this invention and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0022] In the description of the embodiments of the present invention, technical terms such as "first," "second," etc. are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it mean that it is an independent or alternative embodiment that is mutually exclusive with other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein may be combined with other embodiments. In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two)

[0024] In view of the above problems, the present application provides a measurement circuit that can accurately measure the high-frequency signal of an ultraviolet ballast, including: a first voltage divider module, a second voltage divider module and an ADC detection module, the first voltage divider module is connected to the second voltage divider module, and the second voltage divider module is connected to the ADC detection module; the first voltage divider module is used to receive a first signal output by the ultraviolet ballast, and divide the first signal to obtain a second signal, the first signal is a non-sinusoidal AC signal, and the voltage of the second signal is less than the voltage of the first signal; the second voltage divider module is used to receive the second signal and convert it into a third signal, the third signal is a DC positive voltage, and the voltage of the third signal is less than the voltage of the second signal; the ADC detection module is used to detect and analyze the third signal to obtain a final detection result.

[0025] In some embodiments, the voltage signal output from the UV lamp ballast is divided by a voltage divider network consisting of a capacitor and a transformer 15, reducing the high voltage to a high-frequency AC voltage of approximately 40V. The voltage is then further divided and level-converted to a positive DC voltage (less than 3.3V) by a resistor divider network, and biased to a DC level to prevent negative voltages, thereby facilitating detection by the ADC detection module.

[0026] In some embodiments, the first voltage divider module is a capacitor voltage divider network, and the capacitor voltage divider network includes a capacitor and a transformer 15 .

[0027] In some embodiments, the second voltage divider module is a resistor voltage divider network and an amplitude conversion module, the resistor voltage divider network is used to divide the second signal, and the amplitude conversion module is used to bias the positive and negative polarity of the voltage of the divided second signal into a DC positive signal, and the DC positive signal is the third signal.

[0028] By scaling the voltage signal output from the UV lamp ballast to a low voltage, it is convenient for subsequent circuit detection. At the same time, the low voltage positive and negative polarity signals are biased into DC positive polarity signals, which are suitable for the ADC sampling voltage range.

[0029] In some embodiments, as Figure 1 As shown, the capacitor voltage divider network includes at least a plurality of first capacitors 11 connected in series and a plurality of second capacitors 12 connected in series. The plurality of first capacitors 11 are connected in parallel with the plurality of second capacitors 12 and in series with the third capacitor 13. The fourth capacitor 14 is connected in series with the coil on one side of the transformer 15. The branch formed by the fourth capacitor 14 and the coil on one side of the transformer 15 is connected in parallel with the third capacitor 13.

[0030] In some embodiments, the resistor divider network includes at least a first resistor 21, a second resistor 22 and a third resistor 23, the first resistor 21, the second resistor 22 and the third resistor 23 are connected in series, and the first resistor, the second resistor 22 and the third resistor 23 are connected to the other side of the coil of the transformer 15.

[0031] In some embodiments, the amplitude conversion module includes an operational amplifier 31, the negative input port of the operational amplifier 31 is connected to the output port, the positive input port of the operational amplifier is connected to the connection between the second resistor 22 and the third resistor 23, one end of the operational amplifier 31 is grounded, and the other end is connected to the positive power supply. The side connected to the positive power supply is connected to the fifth capacitor 32, the node of the second capacitor 12, the fourth resistor 33 and the sixth capacitor 34 of the operational amplifier 31, the sixth capacitor 34 is grounded, and the connection between the fourth resistor 33 and the fifth capacitor 32 outputs the third signal.

[0032] In some embodiments, the voltage of the forward power supply is 5V.

[0033] In some embodiments, the third signal is a DC positive voltage with a voltage less than 3.3V.

[0034] The technical solution of the embodiment of the utility model uses two voltage-dividing and step-down circuits and converts the level to a DC positive level, which is biased to a DC level to ensure that no negative voltage is generated, so as to adapt to the detection of the ADC detection module, and ultimately obtains an accurate detection result of the high-frequency signal of the ultraviolet ballast. This measurement circuit not only enables the high-frequency signal to be accurately measured, but also has a simple and stable measurement circuit structure.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A high-frequency signal measurement circuit for an ultraviolet ballast, characterized in that: include: a first voltage divider module, a second voltage divider module and an ADC detection module, wherein the first voltage divider module is connected to the second voltage divider module, and the second voltage divider module is connected to the ADC detection module; The first voltage divider module is configured to receive a first signal output by the ultraviolet ballast and divide the first signal to obtain a second signal, wherein the first signal is a non-sinusoidal AC signal, and a voltage of the second signal is smaller than a voltage of the first signal; The second voltage divider module is configured to receive the second signal and convert the second signal into a third signal, wherein the third signal is a DC positive voltage and the voltage of the third signal is lower than the voltage of the second signal; The ADC detection module is used to detect and analyze the third signal to obtain a final detection result.

2. The ultraviolet ballast high-frequency signal measurement circuit according to claim 1, characterized in that: The first voltage dividing module is a capacitor voltage dividing network, and the capacitor voltage dividing network includes a capacitor and a transformer.

3. The ultraviolet ballast high-frequency signal measurement circuit according to claim 2, characterized in that: The second voltage divider module is a resistor voltage divider network and an amplitude conversion module. The resistor voltage divider network is used to divide the second signal. The amplitude conversion module is used to bias the positive and negative polarity of the voltage of the divided second signal into a DC positive signal. The DC positive signal is the third signal.

4. The ultraviolet ballast high-frequency signal measurement circuit according to claim 3, characterized in that: The capacitor voltage divider network includes at least a plurality of first capacitors connected in series and a plurality of second capacitors connected in series. The plurality of first capacitors are connected in parallel with the plurality of second capacitors and in series with a third capacitor. A fourth capacitor is connected in series with a coil on one side of a transformer. The branch formed by the fourth capacitor and the coil on one side of the transformer is connected in parallel with the third capacitor.

5. The ultraviolet ballast high-frequency signal measurement circuit according to claim 4, characterized in that: The resistor divider network includes at least a first resistor, a second resistor and a third resistor, the first resistor, the second resistor and the third resistor are connected in series, and the first resistor, the second resistor and the third resistor are connected to the other side coil of the transformer.

6. The ultraviolet ballast high-frequency signal measurement circuit according to claim 5, characterized in that: The amplitude conversion module includes an operational amplifier, the negative input port of the operational amplifier is connected to the output port, the positive input port of the operational amplifier is connected to the connection point of the second resistor and the third resistor, one end of the operational amplifier is grounded, the other end is connected to the positive power supply, the side connected to the positive power supply is connected to the fifth capacitor, the fifth capacitor is grounded, the operational amplifier is connected to the fourth resistor and the sixth capacitor, the sixth capacitor is grounded, and the connection point between the fourth resistor and the fifth capacitor outputs the third signal.

7. The ultraviolet ballast high-frequency signal measurement circuit according to claim 6, characterized in that: The voltage of the forward power supply is 5V.

8. The ultraviolet ballast high-frequency signal measurement circuit according to claim 1, characterized in that: The third signal is a DC positive voltage with a voltage less than 3.3V.

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