CN113824495B - Circuit, method and device for calculating Q-Factor and electronic equipment - Google Patents
Circuit, method and device for calculating Q-Factor and electronic equipment Download PDFInfo
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- CN113824495B CN113824495B CN202111390539.9A CN202111390539A CN113824495B CN 113824495 B CN113824495 B CN 113824495B CN 202111390539 A CN202111390539 A CN 202111390539A CN 113824495 B CN113824495 B CN 113824495B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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Abstract
The embodiment of the application discloses a circuit, a method and a device for calculating a Q-Factor and electronic equipment, which are used for improving the accuracy of the Q-Factor. The embodiment of the application is as follows: the device comprises a filter circuit, a resonant network, a first detection circuit and a control circuit; the filter circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier and a comparator; the resonant network is respectively connected with the control circuit and a first end of a first resistor R1, and a second end of the first resistor R1 is connected with the amplifier; the amplifier is respectively connected with the first end of the second resistor R2 and the first end of the third resistor R3; a second end of the second resistor R2 is respectively connected with a first end of the first capacitor C1 and a first input port of the comparator; the second end of the third resistor R3 is respectively connected with the second end of the first capacitor C1, the first end of the second capacitor C2 and the second input port of the comparator; a second end of the second capacitor C2 is grounded; the comparator is connected with the first detection circuit; the first detection circuit is connected with the control circuit.
Description
Technical Field
The embodiment of the application relates to the field of information processing, in particular to a circuit, a method and a device for calculating a Q-Factor and electronic equipment.
Background
Q-Factor, also called Q Factor, is commonly used in Optical communication systems including Dense Wavelength Division Multiplexing (WDM), where Optical Signal Noise Ratio (OSNR) is an important index for measuring Optical path performance, and the nonlinear effect of the current high-speed transmission system (single channel 10G and above) is very strong, which has a very important influence on the system. The magnitude of the nonlinear effect can cause significant changes in the system under the same OSNR. That is, high speed systems at 10G and above cannot more accurately measure system performance by means of OSNR alone, so Q-Factor is introduced to measure system performance.
The Q-Factor can be applied to a charging circuit, in particular to a wireless charging coil circuit, besides being applied to an optical communication system. Since the wireless charging coil is equivalent to an inductor, in the process of wireless charging, the magnetic field on the coil is changed by applying alternating current to the coil, the change of the magnetic field can affect the magnetic change of another receiving coil, and simultaneously, the same alternating current is generated in the receiving coil, and then the receiving coil end circuit processes the generated alternating current to charge. In the wireless charging coil circuit, Q-Factor refers to the quality Factor of the inductor.
In the wireless charging process, if a metal foreign body exists in the two coils, the metal foreign body can generate an eddy current effect due to an alternating magnetic field, and the metal foreign body can be heated due to the eddy current effect, so that the insecurity of the charging process is increased. The approach of the foreign metal absorbs a part of the magnetic energy, so that the inductance is reduced. The inductance of the coil is reduced because the magnetic energy is absorbed by the metal foreign body, thus resulting in a reduction in the Q-Factor in both coils.
That is, whether a metal foreign object exists in the magnetic field region of the wireless charging coil can be judged by calculating the Q-Factor. The Q-Factor is also calculated in relation to frequency, voltage, etc. Self-oscillation can be generated through a resonant network in the wireless charging coil circuit, and in the self-oscillation process, a quality Factor Q-Factor is calculated: the voltage at the highest point at the beginning of oscillation, a predetermined voltage value and the time of the node reaching the predetermined voltage value are calculated. In the self-oscillation process, the initial voltage can be easily detected by the built-in ADC, and at the moment, only one voltage value needs to be specified, so that the voltage value has sufficient time to reach the preset voltage value through the self-oscillation attenuation. However, there is more measurement interference on the measurement of the node time, and the larger interference directly causes the increase of the measurement error of the node time, which results in the reduction of the accuracy of the Q-Factor. Another method for calculating the Q-Factor currently is to multiply the node time in the formula by a fixed frequency, that is, to calculate the number of cycles, i.e., the Q-Factor can be directly calculated by calculating the number of cycles, but the calculation of the number of cycles requires accurate detection, otherwise, the measurement error of the number of cycles becomes large, which results in reducing the accuracy of the Q-Factor.
Disclosure of Invention
The first aspect of the embodiments of the present application provides a circuit for calculating a Q-Factor, which is used to improve the accuracy of the Q-Factor, and the circuit for calculating a Q-Factor includes:
the device comprises a filter circuit, a resonant network, a first detection circuit and a control circuit;
the filter circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier and a comparator;
the resonant network is respectively connected with the control circuit and a first end of a first resistor R1, a second end of the first resistor R1 is connected with the amplifier, and the resonant network is used for forming a self-oscillation signal under the control of the control circuit;
the amplifier is respectively connected with a first end of the second resistor R2 and a first end of the third resistor R3;
a second end of the second resistor R2 is connected to a first end of the first capacitor C1 and a first input port of the comparator, respectively;
a second end of the third resistor R3 is connected to a second end of the first capacitor C1, a first end of the second capacitor C2, and a second input port of the comparator, respectively;
the second end of the second capacitor C2 is grounded;
the comparator is connected with the first detection circuit, and the first detection circuit is used for receiving a signal output by the self-oscillation signal of the resonant network after being processed by the filter circuit and transmitting a waveform diagram after being processed by the filter circuit to the control circuit;
the first detection circuit is connected with the control circuit, and the control circuit is further used for analyzing and calculating the node time T when the medium voltage of the oscillogram reaches a preset voltage value by using the signal transmitted by the first detection circuit, and calculating the Q-Factor by using the node time T.
Optionally, the resonant network includes a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, an inductor Lp, a capacitor Cp, a diode D1, a first diode, a second diode, a third diode, and a fourth diode;
the MOS tube Q1 is connected with the first diode through a source electrode and a drain electrode;
the MOS tube Q2 is connected with the second diode through a source electrode and a drain electrode;
the MOS tube Q3 is connected with a third diode through a source electrode and a drain electrode;
the MOS tube Q4 is connected with a fourth diode through a source electrode and a drain electrode;
the first end of the inductor Lp is respectively connected with the control circuit and the grid electrode of the MOS tube Q1;
a first end of the capacitor Cp is respectively connected with the source electrode of the MOS transistor Q2 and the drain electrode of the MOS transistor Q3;
the drain electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, and then is connected with the control circuit;
the source electrode of the MOS tube Q3 is grounded;
the source electrode of the MOS tube Q4 is grounded;
after the second end of the inductor Lp is connected with the second end of the capacitor Cp, the connection point of the second end of the inductor Lp and the second end of the capacitor Cp is connected with the diode D1;
the diode D1 is connected with a first resistor R1 of the filter circuit;
the control circuit is respectively connected with the grid of the MOS transistor Q1, the grid of the MOS transistor Q2, the grid of the MOS transistor Q3 and the grid of the MOS transistor Q4, and the control circuit is used for controlling the on and off of the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3 and the MOS transistor Q4 so as to control the working mode of the resonant network.
Optionally, the circuit further includes an external power interface, the external power interface is connected to a connection point between the drain of the MOS transistor Q1 and the drain of the MOS transistor Q2, and the control circuit, and the external power interface is used for accessing an external power supply.
Optionally, the control circuit includes a micro control unit control chip, the micro control unit control chip is used for controlling the on and off of the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3, and the MOS transistor Q4, and the micro control unit control chip is used for calculating the Q-Factor.
Optionally, the control circuit further includes an analog-to-digital converter, and the analog-to-digital converter is configured to analyze the waveform transmitted by the first detection circuit and transmit an analysis result to the micro control unit control chip.
Optionally, the control circuit further includes a storage module, and the storage module is configured to store data.
Optionally, the circuit further includes a second detection circuit, the second detection circuit is respectively connected to the resonant network and the control circuit, and the second detection circuit is configured to receive and process a signal output by self-oscillation of the resonant network, and transmit an unfiltered waveform to the control circuit.
A second aspect of the embodiments of the present application provides a method for calculating a Q-Factor, which is used to improve accuracy of the Q-Factor, and the method for calculating the Q-Factor includes:
enabling the resonant network to self-oscillate through the control circuit;
the self-oscillation signal of the resonant network is filtered through a filter circuit, so that the generated waveform pattern has a gradually descending trend, the filter circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier and a comparator, the resonant network is respectively connected with a control circuit and a first end of a first resistor R1, a second end of a first resistor R1 is connected with the amplifier, the amplifier is respectively connected with a first end of a second resistor R2 and a first end of a third resistor R3, a second end of a second resistor R2 is respectively connected with a first end of a first capacitor C1 and a first input port of the comparator, a second end of a third resistor R3 is respectively connected with a second end of the first capacitor C1, a first end of a second capacitor C2 and a second input port of the comparator, a second end of the second capacitor C2 is grounded, and the comparator is connected with a first detection circuit, the first detection circuit is connected with the control circuit;
the filtered self-oscillation signal is converted by the first detection circuit and then transmitted to the control circuit;
analyzing the converted self-oscillation signal through a control circuit, and calculating the node time T of the waveform pattern of the self-oscillation signal reaching a preset voltage;
and calculating the Q-Factor through a control circuit according to the node time T.
A second aspect of the embodiments of the present application provides a device for calculating a Q-Factor, configured to improve accuracy of the Q-Factor, the device for calculating a Q-Factor, including:
the self-oscillation unit is used for enabling the resonance network to carry out self-oscillation through the control circuit;
a filter processing unit, configured to filter the self-oscillation signal of the resonant network through a filter circuit, so that the generated waveform pattern has a gradually decreasing trend, where the filter circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier, and a comparator, the resonant network is connected to the control circuit and a first end of the first resistor R1, respectively, a second end of the first resistor R1 is connected to the amplifier, the amplifier is connected to a first end of the second resistor R2 and a first end of the third resistor R3, respectively, a second end of the second resistor R2 is connected to a first end of the first capacitor C1 and a first input port of the comparator, a second end of the third resistor R3 is connected to a second end of the first capacitor C1, a first end of the second capacitor C2, and a second end of the comparator, a second end of the second capacitor C2 is grounded, and the comparator is connected to the first detection circuit, the first detection circuit is connected with the control circuit;
the conversion unit is used for converting the filtered self-oscillation signal through the first detection circuit and transmitting the converted self-oscillation signal to the control circuit;
the analysis unit is used for analyzing the converted self-oscillation signal through the control circuit and calculating the node time T when the waveform pattern of the self-oscillation signal reaches the preset voltage;
and the computing unit is used for computing the Q-Factor through the control circuit according to the node time T.
A third aspect of the present application provides an electronic device, comprising:
the device comprises a processor, a memory, an input and output unit and a bus;
the processor is connected with the memory, the input and output unit and the bus;
the memory holds a program that is called by the processor to perform the method of calculating the Q-Factor as well as any optional method of the second aspect.
A fourth aspect of the present application provides a computer readable storage medium having a program stored thereon, the program, when executed on a computer, performing the method of calculating Q-Factor as described in the second aspect and any of the alternatives to the second aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
in this embodiment, the circuit for calculating the Q-Factor includes a filter circuit, a resonant network, a first detection circuit, and a control circuit. The filter circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier and a comparator. The resonant network is respectively connected with the control circuit and a first end of the first resistor R1, a second end of the first resistor R1 is connected with the amplifier, and the resonant network is used for forming a self-oscillation signal under the control of the control circuit. The amplifier is connected to a first terminal of the second resistor R2 and a first terminal of the third resistor R3, respectively. The second end of the second resistor R2 is connected to the first end of the first capacitor C1 and the first input port of the comparator, respectively. The second end of the third resistor R3 is connected to the second end of the first capacitor C1, the first end of the second capacitor C2, and the second input port of the comparator, respectively. The second terminal of the second capacitor C2 is connected to ground. The comparator is connected with the first detection circuit, and the first detection circuit is used for receiving a signal output by the self-oscillation signal of the resonant network after being processed by the filter circuit and transmitting a waveform diagram after being processed by the filter circuit to the control circuit. The first detection circuit is connected with the control circuit, and the control circuit is further used for analyzing and calculating the node time T when the medium voltage of the oscillogram reaches a preset voltage value by using the signal transmitted by the first detection circuit, and calculating the Q-Factor by using the node time T. The filter circuit can generate a oscillogram of an electric signal of the resonant network in the self-oscillation process, the oscillogram reduced between the generation of the amplifier and the comparator can be indirectly determined until the actual voltage value in the oscillogram reaches a preset voltage value, the current node time can be indirectly determined, and then the quality Factor Q-Factor can be calculated according to the voltage of the highest point when the self-oscillation starts and the preset voltage value, so that the measurement error of the node time is reduced, and the accuracy of the quality Factor Q-Factor is improved.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a circuit for calculating a Q-Factor according to the present application;
FIG. 2 is a schematic diagram of one embodiment of a resonant network in a circuit for calculating a Q-Factor according to the present application;
FIG. 3 is a schematic diagram of one embodiment of a method for computing Q-Factor according to the present application;
FIG. 4 is a schematic diagram of an embodiment of an apparatus for computing Q-Factor according to the present application;
fig. 5 is a schematic diagram of an embodiment of an electronic device of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In the prior art, the Q-Factor is a parameter for measuring the efficiency of a system, and can generate self-oscillation through a resonant network, and in the self-oscillation process, the quality Factor Q-Factor can be calculated through the voltage of the highest point at the beginning of the self-oscillation, a preset voltage value and the node time reaching the preset voltage value. In the self-oscillation process, only one preset voltage value needs to be specified, and the preset voltage value is reached through the attenuation of the self-oscillation in sufficient time. In the measurement process, the initial voltage can be easily detected by a built-in digital-to-analog converter (ADC), however, the measurement of the node time is difficult to increase, and if the measurement error of the node time is increased, the accuracy of the Q-Factor is reduced.
Based on this, the embodiment of the application discloses a circuit, a method and a device for calculating a Q-Factor and electronic equipment, which are used for improving the accuracy of the Q-Factor.
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The method of the present application may be applied to a server, a device, a terminal, or other devices with logic processing capability, and the present application is not limited thereto. For convenience of description, the following description will be given taking the execution body as an example.
Referring to fig. 1-2, the present application provides an embodiment of a circuit for calculating Q-Factor, comprising:
the device comprises a filter circuit 1, a resonant network 2, a first detection circuit 3 and a control circuit 4;
the filter circuit 1 comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier 5 and a comparator 6;
the resonant network 2 is respectively connected with the control circuit 4 and a first end of a first resistor R1, a second end of the first resistor R1 is connected with the amplifier 5, and the resonant network 2 is used for forming a self-oscillation signal under the control of the control circuit 4;
the amplifier 5 is respectively connected with a first end of the second resistor R2 and a first end of the third resistor R3;
a second end of the second resistor R2 is connected to a first end of the first capacitor C1 and a first input port of the comparator 6, respectively;
a second end of the third resistor R3 is connected to the second end of the first capacitor C1, the first end of the second capacitor C2 and the second input port of the comparator 6, respectively;
the second end of the second capacitor C2 is grounded;
the comparator 6 is connected with the first detection circuit 3, and the first detection circuit 3 is used for receiving a signal output by the self-oscillation signal of the resonant network 2 after being processed by the filter circuit 1 and transmitting a waveform diagram after being filtered into the control circuit 4;
the first detection circuit 3 is connected with the control circuit 4, and the control circuit 4 is further configured to analyze and calculate a node time T when the medium voltage of the waveform diagram reaches a preset voltage value by using the signal transmitted by the first detection circuit 3, and calculate Q-Factor by using the node time T.
The control circuit 4 is a set of all sub-control circuits 4 including a micro control unit control chip (MCU control chip). In the calculation process of the Q-Factor, the main function is to control the resonant network 2 to generate resonance, and after the control circuit 4 disconnects the control of the resonant network 2, the resonant network 2 starts to self-oscillate, and since the frequency is the self-oscillation frequency, the energy in the resonant network 2 is totally consumed on the internal resistance, and the energy is converted into heat energy. The filter circuit 1 is used for filtering the self-oscillation electric signal of the resonant network 2, transmitting the filtered electric signal into the voltage detection circuit for conversion, and transmitting the converted electric signal to the processing element in the control circuit 4 for voltage analysis by the detection circuit.
The filter circuit 1 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier 5, and a comparator 6, and the connection mode is: the resonant network 2 is respectively connected with the control circuit 4 and a first end of a first resistor R1, a second end of the first resistor R1 is connected with the amplifier 5, the amplifier 5 is respectively connected with a first end of a second resistor R2 and a first end of a third resistor R3, a second end of the second resistor R2 is respectively connected with a first end of a first capacitor C1 and a first input port of the comparator 6, a second end of the third resistor R3 is respectively connected with a second end of the first capacitor C1, a first end of the second capacitor C2 and a second input port of the comparator 6, and a second end of the second capacitor C2 is grounded.
The filter circuit 1 amplifies the self-oscillation signal of the resonant network 2 through the amplifier 5, and then the comparator 6 compares the self-oscillation voltage, two ports of the comparator 6 can be compared according to the small difference between the two signals, when the amplitude of the differential mode signal exceeds the preset range, the comparator 6 outputs a corresponding level signal, and if the amplitude of the differential mode signal does not exceed the preset range, the level signal is not output. The first capacitor C1 and the second capacitor C2 have different capacitance values, the first capacitor C1 and the second capacitor C2 are used for filtering signals, so that the amplitudes of common mode signals are different, the output of the comparator 6 is a positive level, even if the input waveform is negative, the output waveform is positive, and when the oscillation continuously approaches 0, the compared waveform approaches 0. And then the first detection circuit 3 is used for conversion, and the voltage can be transmitted to a processing element in the control circuit 4 by the detection circuit for voltage analysis. The filter circuit 1 has a main function of comparing the voltage in the waveform diagram with a preset voltage value and retaining the electric signal greater than the preset voltage value, so that the control circuit 4 can accurately determine the node time T when the voltage in the waveform diagram reaches the preset voltage value.
The amplifier 5 in the filter circuit 1 may be a single independent amplifier 5, or the amplifier 5 may be formed by a circuit inside a chip in the control circuit 4, which is not limited herein.
The formula for calculating Q-Factor using node time T and its principle are as follows:
assuming that a resistor, a capacitor and an inductor are connected in series in the circuit, if there is alternating current in the circuit, the voltage relationship can be expressed as:
uCis the capacitor voltage uRIs a resistance voltage uLThe inductor voltage, C, L, R, and R are the capacitance, the current and voltage in the circuit can be expressed as:
i is the circuit current. Hypothesis constants
And assuming an angular velocity w associated with the self-oscillation frequency f0Then there is
Voltage u of capacitorCThe general solution of (A) can be defined as
Where A is a constant, p is an unknown, and t is time, then:
resonance, p, only occurs under underdamping1And p2A pair of conjugate complex roots, the resonance U in the circuit0(t) can be expressed as:
where k is an unknown number that needs to be solved, let us assume
，
For unknowns, the initial conditions are determined
,
,U0The value of the capacitor voltage at the beginning of the self-oscillation of the resonant network 2, which can be measured by means of a digital-to-analog converter in the control circuit 4,
the capacitance voltage integral value at the self-oscillation starting time of the resonant network 2 is the resonance U in the circuit0(t) may be further expressed as:
due to the fact that
，
And the quality Factor Q-Factor can be expressed as
Then, there are:
wherein the content of the first and second substances,
since we only need to count the wave crest, we can get the envelope, and then let the voltage uCComprises the following steps:
due to the fact that
F is the self-oscillation frequency, T is the node time, then:
due to u in the above figureC、U0And f can be calculated or measured according to the circuit, pi is a constant, so that:
at this moment, the Q-Factor can be calculated only by analyzing the oscillogram processed by the filter circuit 1 through the control circuit 4 and accurately calculating the node time T.
Referring to fig. 2, optionally, the resonant network 2 includes a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, an inductor Lp, a capacitor Cp, a diode D1, a first diode, a second diode, a third diode, and a fourth diode;
the MOS tube Q1 is connected with the first diode through a source electrode and a drain electrode;
the MOS tube Q2 is connected with the second diode through a source electrode and a drain electrode;
the MOS tube Q3 is connected with a third diode through a source electrode and a drain electrode;
the MOS tube Q4 is connected with a fourth diode through a source electrode and a drain electrode;
the first end of the inductor Lp is respectively connected with the control circuit 4 and the gate of the MOS transistor Q1;
a first end of the capacitor Cp is respectively connected with the source electrode of the MOS transistor Q2 and the drain electrode of the MOS transistor Q3;
the drain of the MOS transistor Q1 is connected to the drain of the MOS transistor Q2, and then connected to the control circuit 4;
the source electrode of the MOS tube Q3 is grounded;
the source electrode of the MOS tube Q4 is grounded;
after the second end of the inductor Lp is connected with the second end of the capacitor Cp, the connection point of the second end of the inductor Lp and the second end of the capacitor Cp is connected with the diode D1;
the diode D1 is connected to the first resistor R1 of the filter circuit 1;
the control circuit 4 is respectively connected with the gate of the MOS transistor Q1, the gate of the MOS transistor Q2, the gate of the MOS transistor Q3, and the gate of the MOS transistor Q4, and the control circuit 4 is configured to control on and off of the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3, and the MOS transistor Q4, so as to control the operating mode of the resonant network 2.
The main function of the control circuit 4 is to control the on and off of the 4 MOS transistors, namely the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3 and the MOS transistor Q4. When Q1 and Q4 are on and Q2 and Q3 are off, a forward current is generated in Lp and Cp in the resonant network 2; when Q1 and Q4 are turned off and Q2 and Q3 are turned on, a reverse current is generated in Lp and Cp in the resonant network 2, and the AC signal generated by this alternating on process causes the resonant network 2 to start resonating (Ping phase). When the generation of the alternating signal is stopped, the resonant network 2 starts to self-oscillate, and since the frequency is the self-oscillation frequency f, the energy in the resonant network 2 is totally consumed on the internal resistance and is converted into heat energy.
Optionally, the circuit further includes an external power interface 7, the external power interface 7 is connected to a connection point between the drain of the MOS transistor Q1 and the drain of the MOS transistor Q2, and the control circuit 4, respectively, and the external power interface 7 is used for accessing an external power supply.
The external power interface 7 is used to supply power to the entire resonant network 2 and the control circuit 4, i.e. for operation of the control circuit 4 and for resonating the resonant network 2 by means of electrical energy.
Optionally, the control circuit 4 includes a micro control unit control chip, the micro control unit control chip is used for controlling the on and off of the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3, and the MOS transistor Q4, and the micro control unit control chip is used for calculating the Q-Factor.
Optionally, the control circuit 4 further includes an analog-to-digital converter, and the analog-to-digital converter is configured to analyze the waveform transmitted by the first detection circuit 3 and transmit an analysis result to the mcu control chip.
Optionally, the control circuit 4 further includes a storage module, and the storage module is configured to store data.
Optionally, the circuit further includes a second detection circuit, the second detection circuit is respectively connected to the resonant network 2 and the control circuit 4, and the second detection circuit is configured to receive and process a signal output by self-oscillation of the resonant network 2, and transmit an unfiltered waveform to the control circuit 4.
The micro control unit control chip is an MCU and is used for controlling the operation of the whole circuit and analyzing and calculating data. The control circuit 4 is mainly used for storing data through a storage module, analyzing the waveform diagram transmitted by the first detection circuit 3 through an analog-to-digital converter, and transmitting the analysis result to the micro control unit control chip.
The circuit also comprises a second detection circuit, the purpose of which is to receive and process the signal of the self-oscillation output of the resonant network 2 and to transmit the waveform pattern without filtering processing to the control circuit 4, for giving a reference waveform pattern to the micro-control unit control chip, reducing the occurrence of calculation errors.
Referring to fig. 3 and fig. 1, the present application provides an embodiment of a method for calculating a Q-Factor, including:
301. the resonant network 2 is self-oscillated by the control circuit 4;
302. the self-oscillation signal of the resonant network 2 is filtered through a filter circuit 1, so that the generated waveform pattern has a gradually descending trend, the filter circuit 1 comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier 5 and a comparator 6, the resonant network 2 is respectively connected with a control circuit 4 and a first end of a first resistor R1, a second end of the first resistor R1 is connected with the amplifier 5, the amplifier 5 is respectively connected with a first end of a second resistor R2 and a first end of a third resistor R3, a second end of a second resistor R2 is respectively connected with a first end of a first capacitor C1 and a first input port of the comparator 6, a second end of a third resistor R3 is respectively connected with a second end of the first capacitor C1, a first end of a second capacitor C2 and a second input port of the comparator 6, a second end of the second capacitor C2 is grounded, the comparator 6 is connected with the first detection circuit 3, and the first detection circuit 3 is connected with the control circuit 4;
303. the filtered self-oscillation signal is converted by the first detection circuit 3 and then transmitted to the control circuit 4;
304. analyzing the converted self-oscillation signal through the control circuit 4, and calculating the node time T of the waveform pattern of the self-oscillation signal reaching a preset voltage;
305. and the Q-Factor is calculated by the control circuit 4 according to the node time T.
Referring to fig. 4 and fig. 1, the present application provides an embodiment of an apparatus for calculating Q-Factor, including:
a self-oscillation unit 401 for self-oscillating the resonant network 2 by the control circuit 4;
a filter processing unit 402, configured to perform filter processing on the self-oscillation signal of the resonant network 2 through a filter circuit 1, so that the generated waveform pattern has a gradually decreasing trend, where the filter circuit 1 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier 5, and a comparator 6, the resonant network 2 is connected to the control circuit 4 and a first end of the first resistor R1, respectively, a second end of the first resistor R1 is connected to the amplifier 5, the amplifier 5 is connected to a first end of the second resistor R2 and a first end of the third resistor R3, respectively, a second end of the second resistor R2 is connected to a first end of the first capacitor C1 and a first input port of the comparator 6, a second end of the third resistor R3 is connected to a second end of the first capacitor C1, a first end of the second capacitor C2, and a second input port of the comparator 6, respectively, and a second end of the second capacitor C2 is grounded, the comparator 6 is connected with the first detection circuit 3, and the first detection circuit 3 is connected with the control circuit 4;
a conversion unit 403, configured to convert the filtered self-oscillation signal by using the first detection circuit 3, and transmit the converted self-oscillation signal to the control circuit 4;
the analysis unit 404 is configured to analyze the converted self-oscillation signal through the control circuit 4, and calculate a node time T when a waveform pattern of the self-oscillation signal reaches a preset voltage;
and a calculation unit 405 for performing Q-Factor calculation by the control circuit 4 according to the node time T.
Referring to fig. 5, the present application provides an electronic device, including:
a processor 501, a memory 502, an input-output unit 503, and a bus 504.
The processor 501 is connected to a memory 502, an input-output unit 503, and a bus 504.
The memory 502 holds a program that the processor 501 calls to perform the method of calculating the Q-Factor as in fig. 3.
The present application provides a computer readable storage medium having a program stored thereon, which when executed on a computer performs a method of calculating a Q-Factor as in fig. 3.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
Claims (10)
1. A circuit for calculating a Q-Factor, comprising:
the device comprises a filter circuit, a resonant network, a first detection circuit and a control circuit;
the filter circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier and a comparator;
the resonant network is respectively connected with the control circuit and a first end of the first resistor R1, a second end of the first resistor R1 is connected with the amplifier, and the resonant network is used for forming a self-oscillation signal under the control of the control circuit;
the amplifiers are respectively connected with a first end of the second resistor R2 and a first end of the third resistor R3;
a second end of the second resistor R2 is connected to a first end of the first capacitor C1 and a first input port of the comparator, respectively;
a second end of the third resistor R3 is connected to a second end of the first capacitor C1, a first end of the second capacitor C2, and a second input port of the comparator, respectively;
a second end of the second capacitor C2 is grounded;
the comparator is connected with the first detection circuit, and the first detection circuit is used for receiving a signal output by the self-oscillation signal of the resonant network after being processed by the filter circuit and transmitting a waveform diagram after being processed by the filter circuit to the control circuit;
the first detection circuit is connected with the control circuit, and the control circuit is further used for analyzing and calculating the node time T when the medium voltage of the oscillogram reaches a preset voltage value and the peak voltage at the beginning of self-oscillation by using the signal transmitted by the first detection circuit, and calculating the Q-Factor by using the node time T, the peak voltage and the preset voltage value.
2. The circuit of claim 1, wherein the resonant network comprises a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, an inductor Lp, a capacitor Cp, a diode D1, a first diode, a second diode, a third diode, and a fourth diode;
the MOS tube Q1 is connected with the first diode through a source electrode and a drain electrode;
the MOS tube Q2 is connected with the second diode through a source electrode and a drain electrode;
the MOS tube Q3 is connected with the third diode through a source electrode and a drain electrode;
the MOS tube Q4 is connected with the fourth diode through a source electrode and a drain electrode;
the first end of the inductor Lp is respectively connected with the control circuit and the gate of the MOS transistor Q1;
a first end of the capacitor Cp is respectively connected with a source electrode of the MOS transistor Q2 and a drain electrode of the MOS transistor Q3;
the drain electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, and then is connected with the control circuit;
the source electrode of the MOS tube Q3 is grounded;
the source electrode of the MOS tube Q4 is grounded;
after the second end of the inductor Lp is connected with the second end of the capacitor Cp, a connection point between the second end of the inductor Lp and the second end of the capacitor Cp is connected with the diode D1;
the diode D1 is connected with the first resistor R1 of the filter circuit;
the control circuit is respectively connected with the gate of the MOS transistor Q1, the gate of the MOS transistor Q2, the gate of the MOS transistor Q3 and the gate of the MOS transistor Q4, and is used for controlling the on and off of the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3 and the MOS transistor Q4 so as to control the working mode of the resonant network.
3. The circuit of claim 2, further comprising an external power interface, wherein the external power interface is connected to a connection point of the drain of the MOS transistor Q1 and the drain of the MOS transistor Q2 and the control circuit, respectively, and is configured to access an external power source.
4. The circuit of claim 2, wherein the control circuit comprises a mcu control chip for controlling the on and off of the MOS transistor Q1, the MOS transistor Q2, the MOS transistor Q3, and the MOS transistor Q4, and wherein the mcu control chip is configured to calculate the Q-Factor.
5. The circuit of claim 4, wherein the control circuit further comprises an analog-to-digital converter for analyzing the waveform pattern transmitted by the first detection circuit and transmitting the analysis result to the MCU control chip.
6. The circuit of any one of claims 1 to 5, wherein the control circuit further comprises a storage module for data storage.
7. The circuit according to any one of claims 1 to 5, further comprising a second detection circuit, the second detection circuit being connected to the resonant network and the control circuit, respectively, the second detection circuit being configured to receive and process a signal output by the self-oscillation of the resonant network and to transmit an unfiltered waveform to the control circuit.
8. A method of calculating a Q-Factor, comprising:
enabling the resonant network to self-oscillate through the control circuit;
filtering the self-oscillation signal of the resonant network by a filter circuit, so that the generated waveform pattern has a gradually decreasing trend, wherein the filter circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier and a comparator, the resonant network is respectively connected with the control circuit and the first end of the first resistor R1, the second end of the first resistor R1 is connected with the amplifier, the amplifier is respectively connected with the first end of the second resistor R2 and the first end of the third resistor R3, the second end of the second resistor R2 is respectively connected with the first end of the first capacitor C1 and the first input port of the comparator, the second end of the third resistor R3 is respectively connected with the second end of the first capacitor C1, the first end of the second capacitor C2 and the second input port of the comparator, a second end of the second capacitor C2 is grounded, the comparator is connected with a first detection circuit, and the first detection circuit is connected with the control circuit;
the filtered self-oscillation signal is converted by a first detection circuit and then transmitted to the control circuit;
analyzing the converted self-oscillation signal through the control circuit, and calculating the node time T when the waveform pattern of the self-oscillation signal reaches a preset voltage and the highest point voltage when self-oscillation starts;
and calculating the Q-Factor through the control circuit according to the node time T, the highest point voltage and a preset voltage.
9. An apparatus for computing a Q-Factor, comprising:
the self-oscillation unit is used for enabling the resonance network to carry out self-oscillation through the control circuit;
a filter processing unit, configured to filter the self-oscillation signal of the resonant network through a filter circuit, so that a generated waveform pattern has a gradually decreasing trend, where the filter circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, an amplifier, and a comparator, the resonant network is connected to the control circuit and the first end of the first resistor R1, respectively, the second end of the first resistor R1 is connected to the amplifier, the amplifier is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the second end of the second resistor R2 is connected to the first end of the first capacitor C1 and the first input port of the comparator, respectively, and the second end of the third resistor R3 is connected to the second end of the first capacitor C1, the first end of the second capacitor C2, and the second input port of the comparator, respectively, a second end of the second capacitor C2 is grounded, the comparator is connected with a first detection circuit, and the first detection circuit is connected with the control circuit;
the conversion unit is used for converting the filtered self-oscillation signal through a first detection circuit and then transmitting the converted self-oscillation signal to the control circuit;
the analysis unit is used for analyzing the converted self-oscillation signal through the control circuit and calculating the node time T when the waveform pattern of the self-oscillation signal reaches a preset voltage value and the highest point voltage when self-oscillation starts;
and the calculation unit is used for calculating the Q-Factor through the control circuit according to the node time T, the highest point voltage and the preset voltage value.
10. An electronic device, comprising:
the device comprises a processor, a memory, an input and output unit and a bus;
the processor is connected with the memory, the input and output unit and the bus;
the memory holds a program that the processor calls to perform a method of computing a Q-Factor as claimed in claim 8.
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| JPH07267733A (en) * | 1994-03-28 | 1995-10-17 | Daishinku Co | Piezoelectric porcelain composition |
| JP3562892B2 (en) * | 1996-01-26 | 2004-09-08 | 三菱電機株式会社 | Electromagnetic actuator drive circuit, electromagnetic actuator device, video tape recorder, and projection type video display device |
| US5924670A (en) * | 1997-12-09 | 1999-07-20 | Applied Power Inc. | Adaptively tuned elastomeric vibration absorber |
| JP3481213B2 (en) * | 2001-03-22 | 2003-12-22 | 日本電子株式会社 | Sample observation method and atomic force microscope in atomic force microscope |
| DE10235217A1 (en) * | 2002-08-01 | 2004-02-19 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit device for operating lamp, especially low pressure discharge lamp has current limiter that can drive control electrode of at least one transistor switching unit in inverter to limit current |
| BR122019016154B8 (en) * | 2007-12-31 | 2021-06-22 | Deka Products Lp | infusion pump set |
| US8610501B2 (en) * | 2009-11-16 | 2013-12-17 | Covidien Lp | Class resonant-H electrosurgical generators |
| CN107204699B (en) * | 2016-03-15 | 2021-05-07 | 恩智浦美国有限公司 | Determination of the Q-factor of a resonant tank network |
| CN106787675B (en) * | 2016-12-28 | 2019-04-23 | 成都芯源***有限公司 | Resonant converter with power factor correction function and controller thereof |
| FR3071618B1 (en) * | 2017-09-28 | 2020-07-10 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | METHOD FOR DETERMINING THE QUALITY FACTOR OF AN OSCILLATOR |
| CN108631407B (en) * | 2018-05-31 | 2019-09-03 | 华智机器股份公司 | A kind of wireless charging circuit and system |
| CN110649821B (en) * | 2019-10-24 | 2021-11-26 | 湖南大学 | Bidirectional SCC type LLC resonant converter, circuit therein and control method |
| CN112928825A (en) * | 2019-12-06 | 2021-06-08 | 恩智浦美国有限公司 | Method for determining quality factor and wireless charger |
| CN111211598B (en) * | 2020-02-12 | 2022-11-22 | 华为数字能源技术有限公司 | Wireless charging circuit, wireless charging method, wireless charging equipment and wireless charging system |
| CN111812408B (en) * | 2020-05-27 | 2022-04-08 | 华为数字能源技术有限公司 | Quality factor detection circuit and method based on oscillation circuit and electronic equipment |
| CN112260715B (en) * | 2020-12-23 | 2021-06-08 | 深圳市汇顶科技股份有限公司 | Antenna circuit, communication chip, terminal device and feedback tuning method |
| CN113452254B (en) * | 2021-05-27 | 2023-03-31 | 华为数字能源技术有限公司 | Resonance transformation system and control method |
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