A composite multi-channel demodulation circuit and demodulation method

Abstract

The present invention belongs to the field of wireless charging technology, and specifically relates to a composite multi-channel demodulation circuit and a demodulation method. It discloses a composite multi-channel demodulation circuit, including a processing chip, the processing chip is electrically connected to a power supply and a first ground wire, the input port of the processing chip is electrically connected to a first capacitor and a second capacitor respectively, the first capacitor is electrically connected to a first signal source connection terminal, the second capacitor is electrically connected to a second signal source connection terminal, a resistor is connected between the first capacitor and the second capacitor, the first capacitor is electrically connected to a first switch, the second capacitor is electrically connected to a second switch, and the first switch and the second switch are both electrically connected to a second ground wire. The present invention can select and process signals from two signal sources with one processing chip, and is particularly suitable for demodulation of modulation signals such as wireless chargers, and has the advantages of simple circuit, few original components, low cost, convenient layout, and reduced placement space.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless charging, and in particular relates to a composite multi-channel demodulation circuit and a demodulation method. Background Art

[0002] With the increasing requirements of electrical equipment for power supply quality, safety, reliability, convenience, immediacy, special occasions, special geographical environments, etc., the contact power transmission method is increasingly unable to meet actual needs; wireless chargers are devices that use the principle of electromagnetic induction for charging. Its principle is similar to that of transformers. By placing a coil at the sending and receiving ends, the sending coil sends an electromagnetic signal to the outside world under the action of electricity, and the receiving coil receives the electromagnetic signal and converts it into current, thereby achieving the purpose of wireless charging. Wireless charging technology is a special power supply method. It does not require a power cord to transmit energy between it and the load. It relies on electromagnetic wave propagation, and then converts the electromagnetic wave energy into electrical energy, ultimately achieving wireless charging.

[0003] The current wireless charger has two communication modulation signals, such as Figure 1 As shown, the usual technology is that each operational amplifier or comparator only processes one signal, and two signals need two independent operational amplifiers or comparators to process; this leads to many components, large space occupation, high cost and other problems; therefore, it is necessary to design a composite multi-channel demodulation circuit, which can reduce electronic devices, simplify circuit layout, reduce costs, etc. Summary of the invention

[0004] In view of the problems raised by the above background technology, the purpose of the present invention is to provide a composite multi-channel demodulation circuit and a demodulation method.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A composite multi-channel demodulation circuit comprises a processing chip, wherein the processing chip is electrically connected to a power supply and a first ground line, an input port of the processing chip is electrically connected to a first capacitor and a second capacitor respectively, the first capacitor is electrically connected to a first signal source connection terminal, the second capacitor is electrically connected to a second signal source connection terminal, a resistor is connected between the first capacitor and the second capacitor, the first capacitor is electrically connected to a first switch, the second capacitor is electrically connected to a second switch, and the first switch and the second switch are both electrically connected to a second ground line.

[0007] As a preferred solution of the present invention, the processing chip is a comparator or an operational amplifier.

[0008] As a preferred solution of the present invention, the resistor is connected in parallel with a third capacitor.

[0009] As a preferred solution of the present invention, the first ground wire and the second ground wire are connected together.

[0010] As a preferred solution of the present invention, the first switch and the second switch are of the same model.

[0011] As a preferred solution of the present invention, the first switch is a MOS switch, a BJT switch or an MCU switch.

[0012] A demodulation method for a composite multi-channel demodulation circuit comprises the following steps:

[0013] S1: connecting to a first signal source through the first signal source connection terminal, and connecting to a second signal source through the second signal source connection terminal;

[0014] S2: Turn on the first switch and turn off the second switch. At this time, the 3rd pin of the processing chip is grounded, the first signal source is short-circuited to the ground, and the second signal source is isolated by the second capacitor and sent to the 2nd pin input end of the input port of the processing chip. After comparison by the processing chip, the processed signal is obtained at the 1st pin output end of the processing chip, and the signal is sent to the microprocessor for identification and then the corresponding operation is executed;

[0015] S3: Turn on the second switch and turn off the first switch. At this time, pin 2 of the processing chip is grounded, the second signal source is short-circuited to the ground, and the first signal source is isolated by the first capacitor and sent to the input terminal of pin 3 of the input port of the processing chip. After comparison by the processing chip, the processed signal is obtained at the output terminal pin 1 of the processing chip; and the signal is sent to the microprocessor for identification and then the corresponding operation is executed.

[0016] Beneficial effects of the present invention:

[0017] The present invention can complete the selection and processing of two-way signals with one processing chip, and is particularly suitable for demodulating modulation signals of wireless chargers. It has the advantages of simple circuit, few original components, low cost, convenient layout, and reduced placement space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0019] Figure 1 A circuit diagram of the prior art;

[0020] Figure 2 It is a circuit diagram of a composite multi-channel demodulation circuit embodiment 1 of the present invention;

[0021] Figure 3 It is a circuit diagram of a composite multi-channel demodulation circuit embodiment 2 of the present invention;

[0022] Figure 4 It is a circuit diagram of a composite multi-channel demodulation circuit embodiment 3 of the present invention;

[0023] Figure 5 It is a circuit diagram of a composite multi-channel demodulation circuit embodiment 3 of the present invention; DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components. The terms "ground" and "ground wire" should be understood in a broad sense here. They can be one or more reference points in an electronic circuit, a power supply terminal, two or more component connection points, or a common point of a local circuit. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Example 1

[0027] like Figure 2 As shown, a composite multi-channel demodulation circuit includes a processing chip IC1A, the processing chip IC1A is electrically connected to a power supply VCC and a first ground line GND1, the input port of the processing chip IC1A is electrically connected to a first capacitor C1 and a second capacitor C2 respectively, the first capacitor C1 is electrically connected to a first signal source connection terminal S1, the second capacitor C2 is electrically connected to a second signal source connection terminal S2, a resistor R1 is connected between the first capacitor C1 and the second capacitor C2, the first capacitor C1 is electrically connected to a first switch K1, the second capacitor C2 is electrically connected to a second switch K2, and the first switch K1 and the second switch K2 are both electrically connected to the second ground line GND2;

[0028] The demodulation method of this embodiment includes the following steps:

[0029] S1: connect the first signal source through the first signal source connection terminal S1, and connect the second signal source through the second signal source connection terminal S2;

[0030] S2: Turn on the first switch K1 and turn off the second switch K2. At this time, the 3rd pin of the processing chip IC1A is grounded, the first signal source is short-circuited to the ground, and the second signal source is isolated by the second capacitor C2 and sent to the 2nd input end of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the 1st pin of the output end of the processing chip IC1A, and the signal is sent to the microprocessor for identification and then the corresponding operation is executed;

[0031] S3: Turn on the second switch K2 and turn off the first switch K1. At this time, pin 2 of the processing chip IC1A is grounded, the second signal source is short-circuited to the ground, and the first signal source is isolated by the first capacitor C1 and sent to the input terminal of pin 3 of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the output terminal pin 1 of the processing chip IC1A; and the signal is sent to the microprocessor for identification and then the corresponding operation is executed.

[0032] In this embodiment, the resistor R1 provides a DC path. Since the internal resistance of the two input terminals of the processing chip IC1A is relatively large and the input current is relatively small, the DC voltage drop across the resistor R1 is very small. For the signal source, the resistor R1 is much larger than the internal resistance of the signal source. The signal source generates a relatively large signal voltage on the resistor R1. After the voltage is compared by the processing chip IC1A, the required signal can be output.

[0033] This embodiment has the advantages of using only one processing chip IC1A to complete the selection and processing of two signals, and is particularly suitable for demodulating the modulated signal of a wireless charger. It has the advantages of simple circuit, few original components, low cost, convenient layout, and reduced placement space.

[0034] Embodiment 2:

[0035] like Figure 3 As shown, a composite multi-channel demodulation circuit includes a processing chip IC1A, the processing chip IC1A is electrically connected to a power supply VCC and a first ground line GND1, the input port of the processing chip IC1A is electrically connected to a first capacitor C1 and a second capacitor C2 respectively, the first capacitor C1 is electrically connected to a first signal source connection terminal S1, the second capacitor C2 is electrically connected to a second signal source connection terminal S2, the first capacitor C1 is electrically connected to a first switch K1, the second capacitor C2 is electrically connected to a second switch K2, the first switch K1 and the second switch K2 are both electrically connected to a second ground line GND2, the first switch K1 is connected in parallel to a first resistor RA, and the second switch K2 is connected in parallel to a second resistor RB;

[0036] The demodulation method of this embodiment includes the following steps:

[0037] S1: connect the first signal source through the first signal source connection terminal S1, and connect the second signal source through the second signal source connection terminal S2;

[0038] S2: Turn on the first switch K1 and turn off the second switch K2. At this time, the 3rd pin of the processing chip IC1A is grounded, the first signal source is short-circuited to the ground, and the second signal source is isolated by the second capacitor C2 and sent to the 2nd input end of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the 1st pin of the output end of the processing chip IC1A, and the signal is sent to the microprocessor for identification and then the corresponding operation is executed;

[0039] S3: Turn on the second switch K2 and turn off the first switch K1. At this time, pin 2 of the processing chip IC1A is grounded, the second signal source is short-circuited to the ground, and the first signal source is isolated by the first capacitor C1 and sent to the input terminal of pin 3 of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the output terminal pin 1 of the processing chip IC1A; and the signal is sent to the microprocessor for identification and then the corresponding operation is executed.

[0040] Compared with Example 1, in this embodiment, the resistor R1 is replaced by a first resistor RA connected in parallel with the first switch K1 and a second resistor RB connected in parallel with the second switch K2. In the circuit, two resistors can also perform the same function as one resistor, but the circuit is simpler with one resistor. Using one resistor is the simplest and best circuit; therefore, this solution is not recommended.

[0041] Embodiment 3:

[0042] like Figure 4 As shown, a composite multi-channel demodulation circuit includes a processing chip IC1A, the processing chip IC1A is electrically connected to a power supply VCC and a ground line GND, the input port of the processing chip IC1A is electrically connected to a first capacitor C1 and a second capacitor C2 respectively, the first capacitor C1 is electrically connected to a first signal source connection terminal S1, the second capacitor C2 is electrically connected to a second signal source connection terminal S2, a resistor R1 is connected between the first capacitor C1 and the second capacitor C2, the first capacitor C1 is electrically connected to a first switch K1, the second capacitor C2 is electrically connected to a second switch K2, and the first switch K1 and the second switch K2 are both electrically connected to the ground line GND;

[0043] The demodulation method of this embodiment includes the following steps:

[0044] S1: connect the first signal source through the first signal source connection terminal S1, and connect the second signal source through the second signal source connection terminal S2;

[0045] S2: Turn on the first switch K1 and turn off the second switch K2. At this time, the 3rd pin of the processing chip IC1A is grounded, the first signal source is short-circuited to the ground, and the second signal source is isolated by the second capacitor C2 and sent to the 2nd input end of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the 1st pin of the output end of the processing chip IC1A, and the signal is sent to the microprocessor for identification and then the corresponding operation is executed;

[0046] S3: Turn on the second switch K2 and turn off the first switch K1. At this time, pin 2 of the processing chip IC1A is grounded, the second signal source is short-circuited to the ground, and the first signal source is isolated by the first capacitor C1 and sent to the input terminal of pin 3 of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the output terminal pin 1 of the processing chip IC1A; and the signal is sent to the microprocessor for identification and then the corresponding operation is executed.

[0047] Compared with Embodiment 1, in this embodiment, the ground wire connected to the processing chip IC1A is connected with the ground wires connected to the first switch K1 and the second switch K2, so that the entire circuit has only one ground wire connected, which is more convenient to use.

[0048] Embodiment 4:

[0049] like Figure 5 As shown, a composite multi-channel demodulation circuit includes a processing chip IC1A, the processing chip IC1A is electrically connected to a power supply VCC and a first ground line GND1, the input port of the processing chip IC1A is electrically connected to a first capacitor C1 and a second capacitor C2 respectively, the first capacitor C1 is electrically connected to a first signal source connection terminal S1, the second capacitor C2 is electrically connected to a second signal source connection terminal S2, a resistor R1 is connected between the first capacitor C1 and the second capacitor C2, the resistor R1 is connected in parallel with a third capacitor C3, the first capacitor C1 is electrically connected to a first switch K1, the second capacitor C2 is electrically connected to a second switch K2, and the first switch K1 and the second switch K2 are both electrically connected to the second ground line GND2;

[0050] The demodulation method of this embodiment includes the following steps:

[0051] S1: connect the first signal source through the first signal source connection terminal S1, and connect the second signal source through the second signal source connection terminal S2;

[0052] S2: Turn on the first switch K1 and turn off the second switch K2. At this time, the 3rd pin of the processing chip IC1A is grounded, the first signal source is short-circuited to the ground, and the second signal source is isolated by the second capacitor C2 and sent to the 2nd input end of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the 1st pin of the output end of the processing chip IC1A, and the signal is sent to the microprocessor for identification and then the corresponding operation is executed;

[0053] S3: Turn on the second switch K2 and turn off the first switch K1. At this time, pin 2 of the processing chip IC1A is grounded, the second signal source is short-circuited to the ground, and the first signal source is isolated by the first capacitor C1 and sent to the input terminal of pin 3 of the input port of the processing chip IC1A. After comparison by the processing chip IC1A, the processed signal is obtained at the output terminal pin 1 of the processing chip IC1A; and the signal is sent to the microprocessor for identification and then the corresponding operation is executed.

[0054] Compared with Embodiment 1, in this embodiment, when the noise of the first signal source and the second signal source is relatively large, the third capacitor C3 connected in parallel with the resistor R1 can filter out the noise in the circuit, thereby improving the anti-interference capability of the demodulation circuit.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A demodulation method for a composite multi-channel demodulation circuit, characterized in that: The composite multi-channel demodulation circuit comprises a processing chip (IC1A), the processing chip (IC1A) is electrically connected to a power supply (VCC) and a first ground line (GND1), the input port of the processing chip (IC1A) is electrically connected to a first capacitor (C1) and a second capacitor (C2), the first capacitor (C1) is electrically connected to a first signal source connection terminal (S1), the second capacitor (C2) is electrically connected to a second signal source connection terminal (S2), a resistor (R1) is connected between the first capacitor (C1) and the second capacitor (C2), the first capacitor (C1) is electrically connected to a first switch (K1), the second capacitor (C2) is electrically connected to a second switch (K2), and the first switch (K1) and the second switch (K2) are both electrically connected to a second ground line (GND2); The demodulation method of the composite multi-channel demodulation circuit comprises the following steps: S1: connecting to the first signal source through the first signal source connection terminal (S1), and connecting to the second signal source through the second signal source connection terminal (S2); S2: Turn on the first switch (K1) and turn off the second switch (K2). At this time, the 3rd pin of the processing chip (IC1A) is grounded, the first signal source is short-circuited to the ground, and the second signal source is isolated by the second capacitor (C2) and sent to the 2nd input end of the input port of the processing chip (IC1A). After comparison by the processing chip (IC1A), the processed signal is obtained at the 1st pin of the output end of the processing chip (IC1A), and the signal is sent to the microprocessor for identification and then the corresponding operation is executed; S3: Turn on the second switch (K2) and turn off the first switch (K1). At this time, pin 2 of the processing chip (IC1A) is grounded, the second signal source is short-circuited to the ground, and the first signal source is isolated by the first capacitor (C1) and sent to the input end of pin 3 of the input port of the processing chip (IC1A). After comparison by the processing chip (IC1A), the processed signal is obtained at the output end pin 1 of the processing chip (IC1A); and the signal is sent to the microprocessor for identification and then the corresponding operation is executed.

2. The demodulation method of a composite multi-channel demodulation circuit according to claim 1, characterized in that: The processing chip (IC1A) is a comparator or an operational amplifier.

3. The demodulation method of a composite multi-channel demodulation circuit according to claim 1, characterized in that: The resistor (R1) is connected in parallel with a third capacitor (C3).

4. The demodulation method of a composite multi-channel demodulation circuit according to claim 1, characterized in that: The first ground line (GND1) and the second ground line (GND2) are connected together.

5. The demodulation method of a composite multi-channel demodulation circuit according to claim 1, characterized in that: The first switch (K1) and the second switch (K2) are of the same model.

6. The demodulation method of a composite multi-channel demodulation circuit according to claim 5, characterized in that: The first switch (K1) is a MOS switch, a BJT switch or an MCU switch.

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