A communication system based on DCDC voltage reduction

Abstract

The utility model discloses a kind of communication system based on DCDC voltage reduction, including the transmission end, receiving end of being connected;Transmission end includes MCU module, DCDC voltage reduction circuit, switch module;Switch module is connected with the feedback sampling circuit of DCDC voltage reduction circuit, MCU module respectively, MCU module controls the on-off of switch module, switch module passes feedback signal of feedback sampling circuit to DCDC voltage reduction circuit, DCDC voltage reduction circuit is used to adjust the output voltage of transmission end and exports output voltage to receiving end;Receiving end includes the voltage division circuit, ADC detection circuit of being connected;Voltage division circuit is connected with DCDC voltage reduction circuit, voltage division circuit is used to divide voltage output voltage, ADC detection circuit is used to collect voltage division voltage value and according to voltage division voltage value conversion data bit encoding.The utility model does not need special communication pin, and data transmission can be realized by DCDC voltage reduction circuit regulation output voltage makes access power voltage variation.

Description

Technical Field

[0001] This utility model relates to the field of power management technology, and in particular to a communication system based on DC-DC step-down. Background Technology

[0002] Currently, traditional data transmission methods mainly rely on serial communication, parallel communication, or wireless communication technologies such as UART, I2C, and SPI. These communication methods generally require dedicated communication pins and are often accompanied by high hardware complexity and power consumption during implementation. Specifically, serial and parallel communication methods typically require multiple pins to complete data transmission and control, increasing the complexity of circuit design and also raising system power consumption. Furthermore, while wireless communication technology can reduce the number of pins, it still requires additional radio frequency circuitry and antenna design, further increasing system cost and power consumption.

[0003] In certain specific application scenarios, such as low-power devices or systems with simple data transmission requirements, only a small amount of data transmission is needed to meet the requirements. In these cases, designers typically do not want to introduce additional dedicated communication circuits or an excessive number of communication pins. Existing technologies often struggle to achieve data transmission by varying the power supply voltage without adding dedicated communication pins. Utility Model Content

[0004] The main purpose of this invention is to propose a communication system based on DC-DC step-down, which aims to solve the problem that it is often difficult to achieve data transmission by changing the power supply voltage without adding a dedicated communication pin in the existing technology.

[0005] To achieve the above objectives, this utility model proposes a communication system based on DC-DC step-down, comprising a connected transmitter and receiver.

[0006] The transmitter includes an MCU module, a DC-DC step-down circuit, and a switching module;

[0007] The switching module is connected to the feedback sampling circuit of the DC-DC step-down circuit and the MCU module respectively. The MCU module is used to control the switching module to turn on and off. The switching module is used to transmit the feedback signal of the feedback sampling circuit to the DC-DC step-down circuit. The DC-DC step-down circuit is used to adjust the output voltage of the transmitter and output the output voltage to the receiver.

[0008] The receiving end includes a connected voltage divider circuit and an ADC detection circuit;

[0009] The voltage divider circuit is connected to the DC-DC step-down circuit. The voltage divider circuit is used to divide the output voltage. The ADC detection circuit is used to collect the divided voltage value and convert it into a data bit code based on the divided voltage value.

[0010] In one embodiment, the DC-DC step-down circuit includes a step-down chip, an inductor, and a first capacitor. One end of the inductor is connected to the step-down chip, and the other end of the inductor is connected to one end of the first capacitor, with the other end of the first capacitor grounded.

[0011] In one embodiment, the transmitter is provided with a charging interface, and the transmitter is connected to the receiver through the charging interface. The charging interface is used to charge the receiver and transmit the data bit encoding.

[0012] In one embodiment, the charging interface is provided with an adapter chip, which is connected to the MCU module.

[0013] In one embodiment, the adapter chip is of model CH343P.

[0014] In one embodiment, the voltage divider circuit includes a first resistor and a second resistor connected together, and the connection point between the first resistor and the second resistor is connected to the MCU module.

[0015] In one embodiment, the feedback sampling circuit includes a third resistor, a fourth resistor, and a fifth resistor. One end of the third resistor is connected to the switching module, one end of the fourth resistor is connected to the other end of the third resistor and one end of the fifth resistor, the other end of the fourth resistor is connected to the other end of the inductor, and the other end of the fourth resistor is grounded.

[0016] In one embodiment, the switching module includes a transistor, the collector of which is connected to the third resistor.

[0017] In one embodiment, the transmitting end includes a filtering circuit, which is connected to the MCU module.

[0018] In one embodiment, the filtering circuit includes a second capacitor and a third capacitor, one end of the second capacitor and one end of the third capacitor are respectively connected to the MCU module, and the other ends of the second capacitor and the third capacitor are both grounded.

[0019] This invention controls the switching module's on / off state via an MCU module and transmits feedback signals from a feedback sampling circuit to a DC-DC step-down circuit. The DC-DC step-down circuit adjusts the output voltage and transmits it to the receiving end. The receiving end divides the output voltage using a voltage divider circuit and collects the divided voltage value using an ADC detection circuit. The received end then converts the divided voltage value into data bit encoding. No dedicated communication pin is required; data transmission can be achieved by adjusting the output voltage of the DC-DC step-down circuit to change the input power supply voltage. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the communication system modules.

[0022] Figure 2 This is the circuit diagram for the MCU module.

[0023] Figure 3 This is the circuit diagram for the charging interface.

[0024] Figure 4 Circuit diagram of the adapter chip;

[0025] Figure 5 Diagram of DC-DC step-down circuit;

[0026] Figure 6 This is a voltage divider circuit diagram;

[0027] Figure 7 This is a test diagram for data modulation.

[0028] Explanation of icon numbers:

[0029] 1. Transmitter; 2. Receiver; 11. MCU module; 12. DC-DC step-down circuit; 13. Switching module; 121. Feedback sampling circuit; 21. Voltage divider circuit; 22. ADC detection circuit; U13. Step-down chip; L1. Inductor; C16. First capacitor; 14. Charging interface; U2. Adapter chip; R56. First resistor; R57. Second resistor; R16. Third resistor; R17. Fourth resistor; R18. Fifth resistor; Q6. Transistor; 15. Filtering circuit; C8. Second capacitor; C9. Third capacitor.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] This invention proposes a communication system based on DC-DC step-down.

[0035] In the embodiments of this utility model, such as Figure 1As shown, the communication system includes a transmitter 1 and a receiver 2 connected together. The transmitter 1 includes an MCU module 11, a DC-DC step-down circuit 12, and a switch module 13. The switch module 13 is connected to the feedback sampling circuit 121 of the DC-DC step-down circuit 12 and the MCU module 11. The MCU module 11 controls the switching on and off of the switch module 13. The switch module 13 transmits the feedback signal from the feedback sampling circuit 121 to the DC-DC step-down circuit 12. The DC-DC step-down circuit 12 adjusts the output voltage of the transmitter 1 and outputs the output voltage to the receiver 2. The receiver 2 includes a voltage divider circuit 21 and an ADC detection circuit 22 connected together. The voltage divider circuit 21 is connected to the DC-DC step-down circuit 12 and is used to divide the output voltage. The ADC detection circuit 22 collects the divided voltage value and converts it into data bit encoding based on the divided voltage value.

[0036] This invention controls the switching of the switching module 13 via the MCU module 11 and transmits the feedback signal from the feedback sampling circuit 121 to the DC-DC step-down circuit 12. The DC-DC step-down circuit 12 adjusts the output voltage and transmits it to the receiving end 2. The receiving end 2 divides the output voltage through the voltage divider circuit 21 and collects the divided voltage value through the ADC detection circuit 22, converting the divided voltage value into data bit encoding. No dedicated communication pin is required. Data transmission can be achieved by adjusting the output voltage of the DC-DC step-down circuit 12 to change the input power supply voltage, which simplifies the hardware design, reduces power consumption, and is suitable for short-distance data transmission scenarios.

[0037] Transmitter 1 sends data through MCU module 11 to control the GPIO port of MCU module 11 to generate a high or low level to switch module 13 to control the on / off state of switch module 13. The on / off state of switch module 13 will affect the potential change of feedback sampling circuit 121. Feedback sampling circuit 121 sends a feedback signal to Fb feedback pin of DC-DC step-down circuit 12. The output voltage is adjusted according to the feedback signal to achieve the purpose of modulation.

[0038] like Figure 5As shown, the DC-DC step-down circuit 12 includes a step-down chip U13, an inductor L1, and a first capacitor C16. One end of the inductor L1 is connected to the step-down chip U13, and the other end of the inductor L1 is connected to one end of the first capacitor C16. The other end of the first capacitor C16 is grounded. The step-down chip U13 is responsible for converting the high input voltage (e.g., a higher voltage from a battery or power source) into the required lower output voltage. The step-down chip U13 controls the changes in current and voltage to ensure stable output. The inductor L1 can smooth the current, reduce current fluctuations, and ensure a more stable output voltage. The first capacitor C16 is used to store charge and regulate voltage fluctuations, smoothing the current output, reducing voltage fluctuations and noise, and providing a more stable voltage output. The other end of the first capacitor C16 is grounded to ensure that the first capacitor C16 can discharge normally and stabilize the operation of the circuit.

[0039] like Figure 3 As shown, the transmitter 1 is equipped with a charging interface 14, which connects to the receiver 2. The charging interface 14 is used to charge the receiver 2 and transmit the data bit encoding. Data transmission can be achieved simply by using the positive and negative terminals of the charging interface 14. Connecting the transmitter 1 to the receiver 2 via the charging interface 14 simplifies the connection between devices, combining charging and data transmission onto a single interface, reducing additional connection ports, and making the device design more concise and space-saving.

[0040] like Figure 4 As shown, the charging interface 14 is equipped with an adapter chip U2, which is connected to the MCU module 11. The adapter chip U2 is of model number CH343P. The adapter chip U2 bridges signal and protocol conversions between different circuits.

[0041] like Figure 6 As shown, the voltage divider circuit 21 includes a first resistor R56 and a second resistor R57 connected together. The connection point between the first resistor R56 and the second resistor R57 is connected to the MCU module 11. The receiving end 2 divides the output voltage to the detection range (within 3.3V) of the MCU module 11 through the first resistor R56 and the second resistor R57. The ADC detection circuit 22 periodically obtains the voltage value from the EN terminal, and determines the data to be transmitted based on the range of the voltage value.

[0042] The output voltage is divided into two voltage levels, each level representing a specific number of data bits. The data encoding method uses a voltage range mapping binary data bits.

[0043] For example: Voltage range A is the voltage value where the voltage change is lower than the set threshold during normal or long-term acquisition, which represents data bit 0; voltage range B is the voltage value where the voltage change exceeds the set threshold, which represents data bit 1; according to the order of voltage change, receiver 2 parses the transmitted data stream.

[0044] The transmitting end controls the output voltage of the DC-DC step-down circuit and transmits the output voltage according to the data bit encoding; the receiving end samples the voltage and determines the voltage range to parse out the data bits. The output voltage waveform after binary data encoding and transmission is shown below, with a period of 5ms. Figure 7 As shown, the transmitter 1 and receiver 2 agree on the following data format: 1 bit of data is sent every 5ms, for a total of 16 bits. Receiver 2 uses the voltage value detected over a long period as a reference voltage. When the voltage fluctuation exceeds a set value, it is considered that a signal has arrived. Small or slow voltage fluctuations will not affect the decoding effect. A 1-bit high level is used as the start signal, and 16 bits of data are sent to receiver 2. Subsequent data reception involves periodically detecting ADC data, such as once every 5ms, and sequentially determining whether the current voltage value's data bit is 0 or 1. Parsing is performed according to the agreed data length of 16 bits. The transmitter retransmits data 3-5 times each time for data verification by receiver 2. This eliminates the need for a dedicated communication pin, simplifying hardware design; reduces power consumption, making it suitable for low-power applications; and improves communication reliability, making it suitable for short-distance, low-speed data transmission.

[0045] The feedback sampling circuit 121 includes a third resistor R16, a fourth resistor R17, and a fifth resistor R18. One end of the third resistor R16 is connected to the switching module 13. One end of the fourth resistor R17 is connected to the other end of both the third resistor R16 and the fifth resistor R18. The other end of the fourth resistor R17 is connected to the other end of the inductor L1 and is grounded. In the feedback sampling circuit 121, the third resistor R16 is used to monitor or limit the current or voltage passing through the switching module 13 and to provide a signal for subsequent voltage feedback. The feedback sampling circuit 121 samples the voltage through the third resistor R16, the fourth resistor R17, and the fifth resistor R18 and feeds the sampling results back to the communication system.

[0046] The switching module 13 includes a transistor Q6, the collector of which is connected to the third resistor R16. The transistor Q6 is used as a switching element to control the opening and closing of the circuit. By controlling the base current, the transistor Q6 can switch between the saturation region (conduction) and the cutoff region (turn-off), thereby realizing the switching function.

[0047] like Figure 2As shown, the transmitting end 1 includes a filtering circuit 15, which is connected to the MCU module 11. The filtering circuit 15 includes a second capacitor C8 and a third capacitor C9. One end of the second capacitor C8 and one end of the third capacitor C9 are respectively connected to the MCU module 11, and the other ends of the second capacitor C8 and the third capacitor C9 are both grounded. The second capacitor C8 and the third capacitor C9 are used to smooth high-frequency noise in the power supply or signal. The filtering circuit 15 can eliminate pulsations and fluctuations in the power supply or signal, providing a smoother and more stable voltage or signal to the MCU module 11, ensuring the normal operation of the MCU module 11.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, this utility model can have various modifications, combinations, and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A communication system based on DC-DC step-down converter, characterized in that, Including the connected transmitter and receiver; The transmitter includes an MCU module, a DC-DC step-down circuit, and a switching module; The switching module is connected to the feedback sampling circuit of the DC-DC step-down circuit and the MCU module respectively. The MCU module is used to control the switching module to turn on and off. The switching module is used to transmit the feedback signal of the feedback sampling circuit to the DC-DC step-down circuit. The DC-DC step-down circuit is used to adjust the output voltage of the transmitter and output the output voltage to the receiver. The receiving end includes a connected voltage divider circuit and an ADC detection circuit; The voltage divider circuit is connected to the DC-DC step-down circuit. The voltage divider circuit is used to divide the output voltage. The ADC detection circuit is used to collect the divided voltage value and convert it into a data bit code based on the divided voltage value.

2. The communication system as described in claim 1, characterized in that, The DC-DC step-down circuit includes a step-down chip, an inductor, and a first capacitor. One end of the inductor is connected to the step-down chip, and the other end of the inductor is connected to one end of the first capacitor. The other end of the first capacitor is grounded.

3. The communication system as described in claim 1, characterized in that, The transmitter is equipped with a charging interface, which is connected to the receiver. The charging interface is used to charge the receiver and transmit the data bit encoding.

4. The communication system as described in claim 3, characterized in that, The charging interface is equipped with an adapter chip, which is connected to the MCU module.

5. The communication system as described in claim 4, characterized in that, The adapter chip model includes CH343P.

6. The communication system as described in claim 1, characterized in that, The voltage divider circuit includes a first resistor and a second resistor connected together, and the connection point between the first resistor and the second resistor is connected to the MCU module.

7. The communication system as described in claim 2, characterized in that, The feedback sampling circuit includes a third resistor, a fourth resistor, and a fifth resistor. One end of the third resistor is connected to the switching module. One end of the fourth resistor is connected to the other end of the third resistor and one end of the fifth resistor. The other end of the fourth resistor is connected to the other end of the inductor and is grounded.

8. The communication system as described in claim 7, characterized in that, The switching module includes a transistor, and the collector of the transistor is connected to the third resistor.

9. The communication system as described in claim 1, characterized in that, The transmitter includes a filtering circuit, which is connected to the MCU module.

10. The communication system as described in claim 9, characterized in that, The filtering circuit includes a second capacitor and a third capacitor. One end of the second capacitor and one end of the third capacitor are respectively connected to the MCU module, and the other ends of the second capacitor and the third capacitor are both grounded.

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