CN114884467A - Signal demodulation device and wireless charging equipment - Google Patents
Signal demodulation device and wireless charging equipment Download PDFInfo
- Publication number
- CN114884467A CN114884467A CN202210763988.1A CN202210763988A CN114884467A CN 114884467 A CN114884467 A CN 114884467A CN 202210763988 A CN202210763988 A CN 202210763988A CN 114884467 A CN114884467 A CN 114884467A
- Authority
- CN
- China
- Prior art keywords
- circuit
- pass filter
- alternating current
- resistor
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/02—Details
- H03D1/04—Modifications of demodulators to reduce interference by undesired signals
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The application provides a signal demodulation device and wireless charging equipment, belongs to signal processing technology field. The signal demodulating apparatus includes: the circuit comprises at least two voltage clamping circuits, a common mode bias circuit, a low-pass filter circuit and a shaping circuit, wherein the common mode bias circuit, the low-pass filter circuit and the shaping circuit are all active circuits; the voltage clamping circuit is used for limiting the voltage value of an input alternating current signal; the common mode bias circuit is used for carrying out common mode on alternating current signals of at least two voltage clamping circuits; the low-pass filter circuit is used for performing integrated filtering processing on the alternating current signals output by the at least two voltage clamping circuits; the shaping circuit is used for shaping and demodulating the alternating current signal after the integrated filtering processing and outputting the alternating current signal to an alternating current receiving end. The method and the device can reduce the complexity of the circuit structure and improve the integration level of the circuit.
Description
Technical Field
The application relates to the technical field of signal processing, in particular to a signal demodulation device and wireless charging equipment.
Background
In the process of wirelessly charging the terminal equipment, the interaction of alternating current signals is realized between the wireless power supply equipment and the terminal equipment through electromagnetic induction. In order to better realize the transmission of the alternating current signals, the alternating current signals need to be modulated when being transmitted, and correspondingly, the alternating current signals need to be demodulated after being received.
In the prior art, when demodulation of an alternating current signal is realized, a passive device or a passive circuit is generally used for realizing the demodulation process.
However, when a passive device or a passive circuit is used, power supply during demodulation is provided by power supply equipment, however, different voltages are required by different terminal equipment, and therefore the power supply equipment needs to provide different voltages for different terminal equipment, and therefore a large number of devices such as a capacitor and a resistor need to be used to ensure normal operation of the passive device or the passive circuit under the condition of providing different voltages, so that the complexity of the whole circuit is high, and the integration level is low.
Disclosure of Invention
An object of the present application is to provide a signal demodulation device and a wireless charging apparatus, which can reduce the complexity of a circuit structure and improve the integration of a circuit.
The embodiment of the application is realized as follows:
in one aspect of the embodiments of the present application, a signal demodulating apparatus is provided, including: the circuit comprises at least two voltage clamping circuits, a common mode bias circuit, a low-pass filter circuit and a shaping circuit, wherein the common mode bias circuit, the low-pass filter circuit and the shaping circuit are all active circuits;
the input end of each voltage clamping circuit is connected with an external alternating current signal, the output end of each voltage clamping circuit is connected with the input end of the low-pass filter circuit, and the voltage clamping circuits are used for limiting the voltage value of the input alternating current signal;
one end of the common mode bias circuit is grounded, the other end of the common mode bias circuit is connected with the input end of the low-pass filter circuit, and the common mode bias circuit is used for carrying out common mode on alternating current signals of at least two voltage clamping circuits;
the output end of the low-pass filter circuit is connected with the input end of the shaping circuit, and the low-pass filter circuit is used for performing integrated filtering processing on alternating current signals output by the at least two voltage clamping circuits;
the output end of the shaping circuit is connected with the alternating current receiving end, and the shaping circuit is used for shaping and demodulating the alternating current signal after the integrated filtering processing and outputting the alternating current signal to the alternating current receiving end.
Optionally, the low pass filter circuit comprises: a first-order low-pass filter circuit and a resistance-capacitance low-pass filter circuit;
the input end of the first-order low-pass filter circuit is connected with the output end of each voltage clamping circuit and the other end of the common mode bias circuit, the output end of the first-order low-pass filter circuit is connected with the input end of the resistor-capacitor low-pass filter circuit, and the first-order low-pass filter circuit is used for carrying out envelope detection on the alternating current signals;
the output end of the resistance-capacitance low-pass filter circuit is connected with the shaping circuit, and the resistance-capacitance low-pass filter circuit is used for filtering high-frequency carriers of alternating current signals.
Optionally, the first order low pass filter circuit comprises: the circuit comprises a first operational amplifier, a first resistor, a first capacitor and a first power supply;
the input end of the first operational amplifier is connected with the output end of each voltage clamping circuit and the other end of the common mode bias circuit;
the power end of the first operational amplifier is connected with a first power supply;
the first resistor is connected between the input end and the output end of the first operational amplifier in parallel, and the first capacitor is connected between the input end and the output end of the first operational amplifier in parallel.
Optionally, the common mode bias circuit comprises: a second resistor, a second power supply;
the first end of the second power supply is grounded, the second end of the second power supply is connected with the first end of the second resistor, and the second end of the second resistor is connected with the first operational amplifier.
Optionally, the resistor-capacitor low-pass filter circuit comprises: the second operational amplifier, a third power supply, a third resistor and a second capacitor;
the first input end of the second transporting and placing device is connected with the output end of the first transporting and placing device, and the second input end of the second transporting and placing device is connected with the output end of the second transporting and placing device;
the power supply end of the second operational amplifier is connected with a third power supply;
the first end of the third resistor is connected with the output end of the second operational amplifier, and the second end of the third resistor is connected with the shaping circuit;
the first end of the second capacitor is connected with the second end of the third resistor, and the second end of the second capacitor is grounded.
Optionally, the shaping circuit comprises: a third operational amplifier, a fourth power supply and a fifth power supply;
the first input end of the third operational amplifier is connected with the output end of the resistance-capacitance low-pass filter circuit, the second input end of the third operational amplifier is connected with a fourth power supply, and the output end of the third operational amplifier is connected with an alternating current receiving end;
and the power supply end of the third operational amplifier is connected with a fifth power supply.
Optionally, the voltage clamping circuit comprises: a fourth resistor and a first diode;
the first end of the fourth resistor is connected with an external alternating current signal, and the second end of the fourth resistor is connected with the input end of the first-order low-pass filter circuit;
the input end of the first diode is grounded, and the output end of the first diode is connected with the second end of the fourth resistor.
In another aspect of the embodiments of the present application, there is provided a wireless charging apparatus, including: the device comprises a signal demodulation device, a charging coil and an alternating current receiving end;
the charging coil is connected with the input end of the signal demodulation device, and the output end of the signal demodulation device is connected with the alternating current receiving end;
the charging coil is used for providing alternating current, and the alternating current receiving terminal is used for carrying out identification processing according to the demodulated alternating current signal output by the signal demodulation device.
Optionally, the wireless charging device is a wireless charger.
Optionally, the ac receiving end is specifically configured to analyze and identify communication data in the demodulated ac signal.
The beneficial effects of the embodiment of the application include:
in the signal demodulation device and the wireless charging equipment provided by the embodiment of the application, the voltage value of an input alternating current signal can be limited through a voltage clamping circuit; common-mode biasing circuit to common-mode the AC signal of the voltage clamping circuit; the alternating current signal output by the voltage clamping circuit is subjected to integrated filtering processing through a low-pass filtering circuit; and shaping and demodulating the AC electric signal subjected to the integrated filtering processing by a shaping circuit, and outputting the AC electric signal to an AC receiving end. The common mode bias circuit, the low-pass filter circuit and the shaping circuit are all active circuits, power supply work can be achieved through a power supply in the circuits, a large number of devices such as capacitance and resistance are not needed, complexity of the whole circuit is reduced, integration level of the whole circuit is improved, and circuit cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a signal demodulation apparatus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another signal demodulation apparatus according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first-order low-pass filter circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a common mode bias circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a voltage clamp circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a resistor-capacitor low-pass filter circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a shaping circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic overall structure diagram of a signal demodulation apparatus according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a wireless charging device according to an embodiment of the present application.
Icon: 100-voltage clamp circuit; 200-common mode bias circuit; 300-a low-pass filter circuit; 310-a first order low pass filter circuit; 320-resistor-capacitor low-pass filter circuit; 400-a shaping circuit; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; c1 — first capacitance; c2 — second capacitance; x1-first handler; x2-second handler; x3-third op amp; a V1 first power supply; a V2 second power supply; v3 — third power supply; v4 — fourth power supply; v5 fifth power supply; d1 — first diode; d2 — second diode; 10-signal demodulation means; 20-a charging coil; 30-alternating current receiving terminal.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is noted that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.
In the prior art, when demodulating an alternating current signal, a passive device or a passive circuit is generally used to implement the demodulation process.
However, when a passive device or a passive circuit is used, power supply during demodulation is provided by a power supply device, however, different voltages are required by different terminal devices, and therefore the power supply device needs to provide different voltages for different terminal devices, and therefore a large number of devices such as capacitance and resistance need to be used, so that normal operation of the passive device or the passive circuit is guaranteed under the condition of providing different voltages, and the whole circuit is high in complexity and low in integration level.
The specific structure and connection relationship of the signal demodulating apparatus provided in the embodiment of the present application are specifically explained below.
Fig. 1 is a schematic structural diagram of a signal demodulation apparatus according to an embodiment of the present application, and referring to fig. 1, the signal demodulation apparatus includes: the circuit comprises at least two voltage clamping circuits 100, a common mode bias circuit 200, a low pass filter circuit 300 and a shaping circuit 400, wherein the common mode bias circuit 200, the low pass filter circuit 300 and the shaping circuit 400 are all active circuits.
The input end of each voltage clamp circuit 100 is connected to an external ac signal, the output end of each voltage clamp circuit 100 is connected to the input end of the low-pass filter circuit 300, and the voltage clamp circuit 100 is configured to limit the voltage value of the input ac signal.
Optionally, there may be two or more voltage clamp circuits 100 in the actual operation process, and the voltage clamp circuits may be correspondingly configured according to actual requirements, and two are taken as examples in fig. 1 for corresponding explanation, which is not limited thereto.
The external ac signal received by the voltage clamp circuit 100 may be an ac signal input through a charging coil during a wireless charging process, and the ac signal may have related data stored therein, for example: protocol data, authentication data, and the like.
One end of the common mode bias circuit 200 is grounded, and the other end is connected to the input end of the low pass filter circuit 300, and the common mode bias circuit 200 is used for common-mode coupling of the ac signals of the at least two voltage clamp circuits 100.
Alternatively, the common mode bias circuit 200 may common-mode the ac signals of the voltage clamp circuits 100, that is, make the voltages input to the low pass filter circuit 300 by different voltage clamp circuits 100 be common-mode input voltages.
The specific circuit structure of the common mode bias circuit 200 may be correspondingly configured according to the number of the voltage clamp circuits 100, but is not limited thereto.
The output end of the low-pass filter circuit 300 is connected to the input end of the shaping circuit 400, and the low-pass filter circuit 300 is configured to perform integrated filtering processing on the ac electrical signals output by the at least two voltage clamping circuits 100.
Optionally, the low-pass filter circuit 300 may perform multiple filtering processes on the input ac electrical signal, remove the noise and other influences generated during the transmission process, obtain a more accurate ac electrical signal, and specifically may perform multiple different filtering processes according to actual requirements.
The output end of the shaping circuit 400 is connected to the ac receiving end, and the shaping circuit 400 is configured to perform shaping demodulation processing on the integrated filtered ac electrical signal and output the integrated filtered ac electrical signal to the ac receiving end.
Optionally, the shaping circuit 400 may shape and demodulate the filtered circuit, and since the circuit needs to modulate the ac power signal in the process of sending the ac power signal, the ac power signal may be shaped and demodulated to obtain the ac power signal before modulation, so as to obtain the demodulated ac power signal.
The ac receiving end may be a device or a circuit that is provided in the wireless charging device and reads the content in the ac signal, and may obtain, based on the demodulated ac signal, protocol data, authentication data, and the like that are specifically transmitted therein.
The following specifically explains the overall working flow of the signal demodulation apparatus in the embodiment of the present application, specifically as follows:
firstly, ac electrical signals transmitted by the charging coil may be received by the plurality of voltage clamping circuits 100, and may be input to the low-pass filter circuit 300 as a common mode input voltage by the common mode bias circuit 200, the input ac electrical signals are filtered by the low-pass filter circuit 300, and then the filtered ac electrical signals are input to the shaping circuit 400, the shaping circuit 400 shapes and demodulates the ac electrical signals, and finally the required ac electrical signals are obtained, and the required ac electrical signals are sent to the ac receiving end for corresponding identification.
In the signal demodulation device provided by the embodiment of the application, the voltage value of an input alternating current signal can be limited through a voltage clamping circuit; common-mode biasing circuit to common-mode the AC signal of the voltage clamping circuit; the alternating current signal output by the voltage clamping circuit is subjected to integrated filtering processing through a low-pass filtering circuit; and shaping and demodulating the AC electric signal subjected to the integrated filtering processing by a shaping circuit, and outputting the AC electric signal to an AC receiving end. The common mode bias circuit, the low-pass filter circuit and the shaping circuit are all active circuits, power supply work can be achieved through a power supply in the circuits, a large number of devices such as capacitance and resistance are not needed, complexity of the whole circuit is reduced, integration level of the whole circuit is improved, and circuit cost is saved.
The following specifically explains a specific structure of a low-pass filter circuit in the signal demodulating apparatus provided in the embodiment of the present application.
Fig. 2 is a schematic structural diagram of another signal demodulation apparatus according to an embodiment of the present application, and referring to fig. 2, a low-pass filter circuit 300 includes: a first order low pass filter circuit 310 and a resistor-capacitor low pass filter circuit 320.
The input end of the first-order low-pass filter circuit 310 is connected to the output end of each voltage clamping circuit 100 and the other end of the common mode bias circuit 200, the output end of the first-order low-pass filter circuit 310 is connected to the input end of the resistor-capacitor low-pass filter circuit 320, and the first-order low-pass filter circuit 310 is used for performing envelope detection on the alternating current signal.
Optionally, the first-order low-pass filter circuit 310 may perform envelope detection processing on the input ac electrical signal during actual operation, and particularly, the filtering may be implemented by an operational amplifier in the first-order low-pass filter circuit 310, which may filter most of noise signals, but may still retain a small portion of high-frequency signals.
The output end of the resistor-capacitor low-pass filter circuit 320 is connected to the shaping circuit 400, and the resistor-capacitor low-pass filter circuit 320 is used for filtering the high-frequency carrier of the alternating current signal.
Optionally, the ac signal after being filtered by the first-order low-pass filter circuit 310 may be further filtered by the resistor-capacitor low-pass filter circuit 320, and the resistor-capacitor low-pass filter circuit 320 may filter the high-frequency carrier, so as to remove a small portion of the high-frequency signal, and obtain a good low-frequency fundamental wave signal.
In the signal demodulating equipment that this application embodiment provided, can loop through first-order low pass filter circuit and resistance capacitance low pass filter circuit and carry out filtering to alternating current signal, can obtain the less alternating current signal of noise, and this alternating current signal is the good low frequency fundamental wave signal of signal, can improve the validity of filtering.
The following specifically explains a specific structure of a first-order low-pass filter circuit in the signal demodulating apparatus provided in the embodiment of the present application.
Fig. 3 is a schematic structural diagram of a first-order low-pass filter circuit according to an embodiment of the present application, and referring to fig. 3, the first-order low-pass filter circuit 310 includes: the circuit comprises a first operational amplifier X1, a first resistor R1, a first capacitor C1 and a first power supply V1; the input end of the first operational amplifier X1 is connected to the output end of each voltage clamp circuit 100 and the other end of the common mode bias circuit 200; the power supply end of the first operational amplifier X1 is connected with a first power supply V1; the first resistor R1 is connected in parallel between the input terminal and the output terminal of the first operational amplifier X1, and the first capacitor C1 is connected in parallel between the input terminal and the output terminal of the first operational amplifier X1.
Optionally, during operation, the ac electrical signal may be envelope-detected by the first operational amplifier X1.
During operation of the first-order low-pass filter circuit 310, filtering may be implemented based on the circuit structure of the common mode bias circuit 200.
The following specifically explains a specific structure of a first-order low-pass filter circuit in the signal demodulating apparatus provided in the embodiment of the present application.
Fig. 4 is a schematic structural diagram of a common mode bias circuit according to an embodiment of the present application, and referring to fig. 4, the common mode bias circuit 200 includes: a second resistor R2, a second power supply V2; a first end of the second power source V2 is grounded, a second end of the second power source V2 is connected to a first end of a second resistor R2, and a second end of the second resistor R2 is connected to the first operational amplifier X1.
Referring to fig. 3 and 4, the first power supply V1 and the second power supply V2 are both dc power supplies, the first operational amplifier X1 may include two input terminals, a first input terminal P may be connected to one voltage clamp circuit 100 and the common mode bias circuit 200, respectively, the first input terminal P may be a positive terminal, the second input terminal N may be connected to the other voltage clamp circuit 100, and the second input terminal N may be a negative terminal. The first input terminal P of the first operational amplifier X1 may be pulled up to the second power supply V2 through the second resistor R2 in the common mode bias circuit 200, and the voltage of the first input terminal P may be close to the voltage value of the second power supply V2, and due to the virtual short nature of the operational amplifier, the voltage of the second input terminal N of the first operational amplifier X1 may also be close to the voltage value of the second power supply V2, so that the input voltages of the plurality of voltage clamping circuits 100 are the common mode input voltage.
The specific structure of the voltage clamp circuit in the signal demodulating apparatus provided in the embodiment of the present application is specifically explained below.
Fig. 5 is a schematic structural diagram of a voltage clamp circuit according to an embodiment of the present application, and referring to fig. 5, the voltage clamp circuit 100 includes: a fourth resistor R4, a first diode D1; a first end of the fourth resistor R4 is connected to the external ac signal, and a second end of the fourth resistor R4 is connected to the input end of the first-order low-pass filter circuit 310; the input terminal of the first diode D1 is grounded, and the output terminal of the first diode D1 is connected to the second terminal of the fourth resistor R4.
When the voltage is too large, the first diode D1 is broken down, the current flows through the fourth resistor R4 and then flows from the first diode D1 to the ground, and since the breakdown voltage of the first diode D1 is a constant voltage VD1, the voltage after the circuit is clamped at VD 1.
The first diode D1 may be a zener diode (zener diode).
The following specifically explains a specific structure of the resistor-capacitor low-pass filter circuit in the signal demodulating apparatus provided in the embodiment of the present application.
Fig. 6 is a schematic structural diagram of a rc low-pass filter circuit according to an embodiment of the present application, please refer to fig. 6, in which the rc low-pass filter circuit 320 includes: the second operational amplifier X2, a third power supply V3, a third resistor R3 and a second capacitor C2; a first input end of the second operational amplifier X2 is connected with an output end of the first operational amplifier X1, and a second input end of the second operational amplifier X2 is connected with an output end of the second operational amplifier X2; the power supply end of the second operational amplifier X2 is connected with a third power supply V3; a first end of the third resistor R3 is connected with the output end of the second operational amplifier X2, and a second end of the third resistor R3 is connected with the shaping circuit 400; the first end of the second capacitor C2 is connected to the second end of the third resistor R3, and the second end of the second capacitor C2 is grounded.
Optionally, the second input terminal of the second operational amplifier X2 is connected to the output terminal, so that the influence of the load of the next stage on the filtering effect of the previous stage can be prevented.
Wherein the first input of the second op amp X2 may be a positive terminal and the second input of the second op amp X2 may be a negative terminal.
The following specifically explains a specific structure of a shaping circuit in the signal demodulating apparatus provided in the embodiment of the present application.
Fig. 7 is a schematic structural diagram of a shaping circuit according to an embodiment of the present application, and referring to fig. 7, the shaping circuit 400 includes: a third op amp X3, a fourth power supply V4, and a fifth power supply V5; a first input end of the third operational amplifier X3 is connected with an output end of the resistor-capacitor low-pass filter circuit 320, a second input end of the third operational amplifier X3 is connected with a fourth power supply V4, and an output end of the third operational amplifier X3 is connected with an alternating current receiving end; the power source terminal of the third op amp X3 is connected to a fifth power source V5.
Alternatively, the third opamp X3 may be a single limit comparator. The shaping circuit 400 can shape the signal after the low-pass filtering of the resistor and the capacitor, apply a suitable dc voltage to the second input terminal to shape the waveform of the signal provided by the previous stage, and demodulate a baseband signal, which is an ac signal after shaping and demodulation, and send the ac signal to an ac receiving terminal.
Wherein the first input of the third opamp X3 may be a positive terminal and the second input of the third opamp X3 may be a negative terminal.
The overall structure of the signal demodulating apparatus provided in the embodiment of the present application is explained below by way of an overall circuit diagram.
Fig. 8 is a schematic diagram of an overall structure of a signal demodulation apparatus according to an embodiment of the present application, please refer to fig. 8, and fig. 8 is an overall circuit of the signal demodulation apparatus, and a specific structure thereof is explained above and is not repeated herein.
Alternatively, fig. 8 illustrates two voltage clamp circuits 100, wherein the first voltage clamp circuit 100 includes the fourth resistor R4 and the first diode D1 shown in fig. 5; the second voltage clamp 100 includes a fifth resistor R5 that functions in the same way as the fourth resistor R4, and a second diode D2 that functions in the same way as the first diode D1.
Accordingly, the second diode D2 may be specifically a zener diode (zener diode).
In an actual circuit, the fourth resistor R4 and the fifth resistor R5 may be different, and the first diode D1 and the second diode D2 may also be different.
Referring to fig. 8, after having the common mode base, two signals are input to the positive and negative ends of the first operational amplifier X1, and the external portion of the operational amplifier, the first resistor R1 and the first capacitor C1 form a negative feedback circuit. The transfer function of the circuit structure of the part is calculated in a frequency domain by using the laplace transform, and the direct current path is not calculated any more in the alternating current path, so that the direct current path is directly short-circuited, namely the first power supply V1 is short-circuited. The following equation can be derived using kirchhoff's current law:
wherein the content of the first and second substances,
the input voltage of the voltage clamping circuit is connected with a first input end (positive end) of the first operational amplifier;
the voltage of a first input end (positive end) of the first operational amplifier;
the input voltage of the voltage clamping circuit is connected with the second input end (negative end) of the first operational amplifier;
the voltage of the second input end (negative end) of the first operational amplifier;
is the resistance value of the first resistor and is,
is the resistance value of the second resistor and is,
is the resistance value of the fourth resistor;
is the resistance value of the fifth resistor;
the current flowing into the first diode D1 in the voltage clamp circuit connected with the first input end of the first operational amplifier;
the current flowing into the second diode D2 in the voltage clamp circuit connected with the first input end of the first operational amplifier;
is the capacitance value of the first capacitor;
is the output voltage of the first operational amplifier;
is the complex frequency in the laplace transform.
In addition, the total impedance based on the circuit of R1 and C1
The calculation formula of (2):
it is possible to obtain:
based on the formula, the current total impedance can be obtained
The larger the output voltage amplitude is, the smaller the output voltage amplitude is, so that part of the signal can be filtered out, but some noise still exists, and secondary filtering is needed.
When the resistance-capacitance low-pass filter circuit 320 performs the filtering operation, the following calculation can be performed through the transfer function:
wherein the content of the first and second substances,
the output voltage of the resistance-capacitance low-pass filter circuit;
the output voltage of the second operational amplifier;
is a resistance value of the third resistor, and,
is the capacitance value of the second capacitor.
Based on the above formula, one can obtain:
wherein the content of the first and second substances,
is the amplitude of the output of the resistor-capacitor low-pass filter circuit,
is the input of the resistor-capacitor low-pass filter circuit,
is the output of the resistor-capacitor low-pass filter circuit.
Since the second input of the second opamp X2 is connected to the output of the second opamp X2, the input and output of the second opamp X2 are the same.
Based on the formula, the higher the complex frequency is, the smaller the output amplitude is, and the high-frequency carrier can be completely filtered through twice filtering.
The specific structure of the wireless charging device provided in the embodiment of the present application is specifically explained below.
Fig. 9 is a schematic structural diagram of a wireless charging device according to an embodiment of the present application, and referring to fig. 9, a wireless charging device is provided, which includes: signal demodulation device 10, charging coil 20 and alternating current receiving terminal 30; the charging coil 20 is connected with the input end of the signal demodulation device 10, and the output end of the signal demodulation device 10 is connected with the alternating current receiving end 30; the charging coil 20 is used for supplying alternating current, and the alternating current receiving terminal 30 is used for performing identification processing according to the demodulated alternating current signal output by the signal demodulating device 10.
Optionally, the wireless charging device may specifically be a wireless charger. Accordingly, the signal demodulating device may be a demodulating device in the wireless charger, and the charging coil may be a charging coil in the wireless charger.
It should be noted that, because when alternating current signals are interacted, devices transmit to each other, the present application is mainly applied to a charging side, that is, a wireless charging device, and in an actual use process, the charging side may also be a power utilization side, for example: the terminal devices such as a mobile phone, a watch, a tablet computer and the like that are wirelessly charged by the wireless charging device are not limited herein.
Optionally, the ac receiving end 30 is specifically configured to analyze and identify communication data in the demodulated ac signal.
For example: the ac receiving terminal 30 may analyze and identify data such as a communication protocol or a communication policy in the ac signal.
In an actual implementation process, the wireless charging protocol may be acquired based on the ac receiving terminal 30, and then the wireless charging protocol therein may be authenticated.
In the embodiments provided in the present invention, it should be understood that the disclosed device structure can be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, 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.
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 invention 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, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. 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 other various media capable of storing program codes.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A signal demodulating apparatus, comprising: the circuit comprises at least two voltage clamping circuits, a common mode bias circuit, a low-pass filter circuit and a shaping circuit, wherein the common mode bias circuit, the low-pass filter circuit and the shaping circuit are all active circuits;
the input end of each voltage clamping circuit is connected with an external alternating current signal, the output end of each voltage clamping circuit is connected with the input end of the low-pass filter circuit, and the voltage clamping circuits are used for limiting the voltage value of the input alternating current signal;
one end of the common mode bias circuit is grounded, the other end of the common mode bias circuit is connected with the input end of the low-pass filter circuit, and the common mode bias circuit is used for carrying out common mode on alternating current signals of at least two voltage clamping circuits;
the output end of the low-pass filter circuit is connected with the input end of the shaping circuit, and the low-pass filter circuit is used for performing integrated filtering processing on alternating current signals output by at least two voltage clamping circuits;
the output end of the shaping circuit is connected with an alternating current receiving end, and the shaping circuit is used for shaping and demodulating the alternating current signal after the integrated filtering processing and outputting the alternating current signal to the alternating current receiving end.
2. The signal demodulating apparatus according to claim 1, wherein the low-pass filter circuit comprises: a first-order low-pass filter circuit and a resistance-capacitance low-pass filter circuit;
the input end of the first-order low-pass filter circuit is connected with the output end of each voltage clamping circuit and the other end of the common mode bias circuit, the output end of the first-order low-pass filter circuit is connected with the input end of the resistor-capacitor low-pass filter circuit, and the first-order low-pass filter circuit is used for carrying out envelope detection on an alternating current signal;
the output end of the resistance-capacitance low-pass filter circuit is connected with the shaping circuit, and the resistance-capacitance low-pass filter circuit is used for filtering high-frequency carriers of alternating current signals.
3. The signal demodulating apparatus according to claim 2, wherein the first-order low-pass filter circuit includes: the circuit comprises a first operational amplifier, a first resistor, a first capacitor and a first power supply;
the input end of the first operational amplifier is connected with the output end of each voltage clamping circuit and the other end of the common mode bias circuit;
the power end of the first operational amplifier is connected with the first power supply;
the first resistor is connected between the input end and the output end of the first operational amplifier in parallel, and the first capacitor is connected between the input end and the output end of the first operational amplifier in parallel.
4. The signal demodulation apparatus of claim 3 wherein said common mode bias circuit comprises: a second resistor, a second power supply;
the first end of the second power supply is grounded, the second end of the second power supply is connected with the first end of the second resistor, and the second end of the second resistor is connected with the first operational amplifier.
5. The signal demodulation apparatus of claim 3 wherein said resistor-capacitor low pass filter circuit comprises: the second operational amplifier, a third power supply, a third resistor and a second capacitor;
the first input end of the second transporting and placing device is connected with the output end of the first transporting and placing device, and the second input end of the second transporting and placing device is connected with the output end of the second transporting and placing device;
the power end of the second operational amplifier is connected with the third power supply;
the first end of the third resistor is connected with the output end of the second operational amplifier, and the second end of the third resistor is connected with the shaping circuit;
and the first end of the second capacitor is connected with the second end of the third resistor, and the second end of the second capacitor is grounded.
6. The signal demodulation apparatus of claim 2 wherein said shaping circuit comprises: a third operational amplifier, a fourth power supply and a fifth power supply;
a first input end of the third operational amplifier is connected with an output end of the resistor-capacitor low-pass filter circuit, a second input end of the third operational amplifier is connected with the fourth power supply, and an output end of the third operational amplifier is connected with the alternating current receiving end;
and the power end of the third operational amplifier is connected with the fifth power supply.
7. The signal demodulation apparatus of claim 2 wherein said voltage clamp circuit comprises: a fourth resistor and a first diode;
the first end of the fourth resistor is connected with the external alternating current signal, and the second end of the fourth resistor is connected with the input end of the first-order low-pass filter circuit;
the input end of the first diode is grounded, and the output end of the first diode is connected with the second end of the fourth resistor.
8. A wireless charging device, comprising: the signal demodulating apparatus, the charging coil and the alternating current receiving terminal according to any one of claims 1 to 7;
the charging coil is connected with the input end of the signal demodulation device, and the output end of the signal demodulation device is connected with the alternating current receiving end;
the charging coil is used for providing alternating current, and the alternating current receiving end is used for carrying out identification processing according to the demodulated alternating current signal output by the signal demodulation device.
9. The wireless charging device of claim 8, wherein the wireless charging device is a wireless charger.
10. The wireless charging device according to claim 8, wherein the ac receiving terminal is specifically configured to perform the analysis and identification of the communication data in the demodulated ac signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210763988.1A CN114884467B (en) | 2022-07-01 | 2022-07-01 | Signal demodulation device and wireless charging equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210763988.1A CN114884467B (en) | 2022-07-01 | 2022-07-01 | Signal demodulation device and wireless charging equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114884467A true CN114884467A (en) | 2022-08-09 |
| CN114884467B CN114884467B (en) | 2022-09-27 |
Family
ID=82683415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210763988.1A Active CN114884467B (en) | 2022-07-01 | 2022-07-01 | Signal demodulation device and wireless charging equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114884467B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1502996A (en) * | 2002-11-20 | 2004-06-09 | 伟 吴 | Detection isolation and transmission device for voltage and current signal |
| US20050186935A1 (en) * | 2004-02-23 | 2005-08-25 | Sharp Kabushiki Kaisha | Wireless receiving circuit and wireless portable device |
| US20050260965A1 (en) * | 2004-04-27 | 2005-11-24 | Broadcom Corporation | Method and system for DC offset cancellation from a modulated signal |
| US20100163631A1 (en) * | 2008-12-25 | 2010-07-01 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor Device, Electronic Appliance Using Semiconductor Device, and Document Using Semiconductor Device |
| JP2010157096A (en) * | 2008-12-26 | 2010-07-15 | Sony Corp | Communication interface circuit and communication equipment |
| US20140253229A1 (en) * | 2013-03-05 | 2014-09-11 | Wanfu Ye | Bask demodulator and method for demodulating bask modulated signal |
| CN104091194A (en) * | 2014-07-07 | 2014-10-08 | 华中科技大学 | Demodulation circuit used for passive ultrahigh frequency RFID label chip |
| CN104200260A (en) * | 2014-08-22 | 2014-12-10 | 合肥宁芯电子科技有限公司 | Demodulator circuit |
| CN105956647A (en) * | 2016-04-27 | 2016-09-21 | 湘潭大学 | Demodulation circuit used in a passive ultrahigh frequency radio-frequency identification label chip |
| CN112653444A (en) * | 2020-12-18 | 2021-04-13 | 施镇乾 | Signal transmission circuit, power line and equipment |
| CN112968621A (en) * | 2021-02-17 | 2021-06-15 | 青岛大学 | Single-stage composite active clamping push-pull flyback inverter |
| US11233501B1 (en) * | 2020-12-18 | 2022-01-25 | Chun Kuen Sze | Signal transmission circuit and power supply line |
| WO2022099483A1 (en) * | 2020-11-10 | 2022-05-19 | 深圳市豪恩智能物联股份有限公司 | Illumination driver power source circuit, illumination driver apparatus, and lamp tube |
| US20220196741A1 (en) * | 2020-12-17 | 2022-06-23 | Nxp Usa, Inc. | Apparatus and method for determining electrical characteristics of an electric motor |
-
2022
- 2022-07-01 CN CN202210763988.1A patent/CN114884467B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1502996A (en) * | 2002-11-20 | 2004-06-09 | 伟 吴 | Detection isolation and transmission device for voltage and current signal |
| US20050186935A1 (en) * | 2004-02-23 | 2005-08-25 | Sharp Kabushiki Kaisha | Wireless receiving circuit and wireless portable device |
| US20050260965A1 (en) * | 2004-04-27 | 2005-11-24 | Broadcom Corporation | Method and system for DC offset cancellation from a modulated signal |
| US20100163631A1 (en) * | 2008-12-25 | 2010-07-01 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor Device, Electronic Appliance Using Semiconductor Device, and Document Using Semiconductor Device |
| JP2010157096A (en) * | 2008-12-26 | 2010-07-15 | Sony Corp | Communication interface circuit and communication equipment |
| US20140253229A1 (en) * | 2013-03-05 | 2014-09-11 | Wanfu Ye | Bask demodulator and method for demodulating bask modulated signal |
| CN104091194A (en) * | 2014-07-07 | 2014-10-08 | 华中科技大学 | Demodulation circuit used for passive ultrahigh frequency RFID label chip |
| CN104200260A (en) * | 2014-08-22 | 2014-12-10 | 合肥宁芯电子科技有限公司 | Demodulator circuit |
| CN105956647A (en) * | 2016-04-27 | 2016-09-21 | 湘潭大学 | Demodulation circuit used in a passive ultrahigh frequency radio-frequency identification label chip |
| WO2022099483A1 (en) * | 2020-11-10 | 2022-05-19 | 深圳市豪恩智能物联股份有限公司 | Illumination driver power source circuit, illumination driver apparatus, and lamp tube |
| US20220196741A1 (en) * | 2020-12-17 | 2022-06-23 | Nxp Usa, Inc. | Apparatus and method for determining electrical characteristics of an electric motor |
| CN112653444A (en) * | 2020-12-18 | 2021-04-13 | 施镇乾 | Signal transmission circuit, power line and equipment |
| US11233501B1 (en) * | 2020-12-18 | 2022-01-25 | Chun Kuen Sze | Signal transmission circuit and power supply line |
| CN112968621A (en) * | 2021-02-17 | 2021-06-15 | 青岛大学 | Single-stage composite active clamping push-pull flyback inverter |
Non-Patent Citations (3)
| Title |
|---|
| BESSIE DE ASSUMPCAO RIBEIRO等: ""Novel Optimization Algorithm to Demodulate a PZT-FBG Sensor in AC High Voltage Measurements"", 《IEEE SENSORS JOURNAL》 * |
| JAE JIN LEE等: ""A 60GHz Low Power CMOS Demodulator for Multi-Gigabit Wireless Receiver Systems"", 《2007 ASIA-PACIFIC MICROWAVE CONFERENCE》 * |
| 张路: ""包络调制无线电能传输系统关键问题研究"", 《中国博士学位论文全文数据库•工程科技Ⅱ辑》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114884467B (en) | 2022-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103916146B (en) | Receiver and method for near-field communication | |
| US10078362B2 (en) | Power delivery information over data interface | |
| CN102340358B (en) | Apparatus applied for detection and transmission of low frequency signal | |
| CN101359933B (en) | Dc line carrier communication device | |
| CN103916164B (en) | Process the method for the baseband signal in direct current suppression system, system and smart card | |
| US20130225070A1 (en) | Communication device and near field communication circuit thereof | |
| CN205385307U (en) | A wireless radio frequency energy charging device for cell -phone | |
| CN103390303B (en) | Based on financial key and the control method thereof of audio frequency and USB data transmission | |
| EP3185398A1 (en) | Wireless power receiver, charging arrangement and method for operating a wireless power receiver | |
| CN114884467B (en) | Signal demodulation device and wireless charging equipment | |
| US11038553B2 (en) | EMC inductor-free RF front-end method and topology with power by field function for an inductively coupled communication system | |
| CN104935424B (en) | For removing the device of carrier signal | |
| CN106909865B (en) | Near-field communication front end hardware circuit, terminal, reader, system and method | |
| CN217116077U (en) | Signal demodulation circuit and signal receiving module | |
| CN112653444B (en) | Signal transmission circuit, power line and electronic equipment | |
| CN103493071B (en) | Signal handling equipment, signal processing method and receiving device | |
| CN206164545U (en) | Supplementary design device of human communication transceiver of electric current coupling type | |
| CN211086428U (en) | Network cable detection circuit | |
| CN210202037U (en) | Power protection circuit and bluetooth headset | |
| CN205945755U (en) | Supersound communication decoding circuit and electromagnetic heating equipment | |
| CN206226433U (en) | A kind of capacitively coupled human body communication transceiver aided design apparatus | |
| CN217693070U (en) | Power supply system and electronic device | |
| Morris et al. | A 90nm CMOS 13.56 MHz NFC transceiver | |
| CN215991190U (en) | High noise suppression audio signal transmission circuit | |
| CN209514641U (en) | A kind of radio frequency decoding circuit and decoding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20220809 Assignee: Shenzhen Anrui Microelectronics Technology Co.,Ltd. Assignor: Zhejiang core Gravity Technology Co.,Ltd. Contract record no.: X2023980033320 Denomination of invention: A signal demodulation device and wireless charging device Granted publication date: 20220927 License type: Common License Record date: 20230308 |