Non-contact induction safety protection circuit of microwave radar human sensing module

Abstract

The utility model discloses a non-contact induction safety protection circuit of a microwave radar human sensing module. The non-contact induction safety protection circuit comprises a radar sensing module (1), an external UART communication circuit (2), an analog switch circuit (3), a PWM control lamp circuit (4) and a power supply circuit (5), according to the utility model, the circuit can achieve two functions of saving power and energy and safely protecting the human body by means of a program matched with the mainboard, the radar sensing module has the function of sensing the human body and then sending a signal to the mainboard, and the two functions are respectively achieved through the program; the induction switch mainly plays a role of an induction switch. The water dispenser can be controlled to start to work when a person gets close to a radar detection range, and the water dispenser is controlled to enter a dormant state after the person leaves the radar detection range and the set time is met at the same time; the disinfection function of the water dispenser can be controlled to stop working when a person gets close to a radar detection range, and the water dispenser is controlled to perform disinfection work again after the person leaves the radar detection range and the set time is met at the same time.

Description

Technical Field

[0001] This utility model relates to the field of water dispenser sensing circuit technology, specifically a microwave radar human sensing module non-contact sensing safety protection circuit. Background Technology

[0002] Water dispensers can be broadly categorized into three types: warm and hot, ice and hot, and ice, warm and hot. Ice and hot dispensers are further divided into semiconductor refrigeration water dispensers and compressor refrigeration water dispensers.

[0003] Patent (CN215777345U) discloses a water dispenser with hot water disinfection pipes and timed emptying of the heating tank. It includes a chassis, a heating unit, a water purification unit, a first water outlet, a second water outlet, a control unit, a water outlet valve unit, a pressure storage tank, a heat exchanger, and an additional piping unit. The pressure storage tank is located inside the chassis, the control unit is located on the chassis, the heat exchanger is connected to the pressure storage tank, the water outlet valve unit is connected to the inner pipe of the heat exchanger, and the first and second water outlets are connected to the water outlet valve unit. This utility model belongs to the technical field of drinking water equipment products, specifically referring to a water dispenser that reduces the water flow rate in the pressure storage tank, preventing excessive water flow and splashing from the water outlet, preventing backflow of hot water during heating by the heating unit, facilitating high-temperature disinfection of the water dispenser pipes, and draining overnight water from the heating tank, thus benefiting the health of the user.

[0004] In the aforementioned patented water dispenser, during timed pipe disinfection, the disinfection and water outlet solenoid valves automatically open simultaneously to discharge boiling water for pipe disinfection. This poses a safety hazard, as passersby could easily be scalded if they unknowingly approach the water dispenser's outlet while boiling water is being discharged. Utility Model Content

[0005] The purpose of this invention is to provide a contactless sensing safety protection circuit for a microwave radar human sensing module, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A contactless sensing safety protection circuit for a microwave radar human sensing module includes a radar sensing module, an external UART communication circuit, an analog switch circuit, a PWM control lamp circuit, and a power supply circuit. The power supply circuit, the external UART communication circuit, the analog switch circuit, and the PWM control lamp circuit are electrically connected to the radar sensing module.

[0008] The analog switch circuit includes a connector J1, whose 3rd interface is connected to the OUT terminal, and the OUT terminal is connected to the 6th interface of the radar sensing module through a resistor R2.

[0009] An external resistor R1 is connected between the 3rd pin and the OUT pin of the connector J1. The resistor R1 is connected to the 19th pin of the radar sensing module through the FILT_VO pin.

[0010] An external capacitor C3 is connected between the FILT_VO terminal and the 19 interface of the radar sensing module, and the capacitor C3 is grounded.

[0011] Furthermore, the VLODIN terminal is externally connected to interface 1 of the connector J1, and an external resistor R20 is connected between the connection between interface 3 of the connector J1 and the OUT terminal.

[0012] The resistor R20, the base of the NPN transistor Q8, the collector of the NPN transistor Q8, the LED1 indicator, the resistor R21, and the VLDOIN terminal are connected in series.

[0013] The emitter of the NPN transistor Q8 is connected to an external resistor R22. The resistor R22 is electrically connected between the resistor R20 and the base of the NPN transistor Q8. The connection between the emitter of the NPN transistor Q8 and the resistor R22 is grounded.

[0014] The 32 interface of the radar sensing module is connected to the VLDOOUT terminal through resistor R5. A capacitor C7 is connected between the 32 interface of the radar sensing module and resistor R5, and capacitor C7 is grounded.

[0015] Furthermore, the power supply circuit includes a resistor R7, one end of which is externally connected to the VLDOIN terminal, and the other end of which is externally connected to the VLDOOUT terminal.

[0016] Furthermore, the power supply circuit includes a voltage regulator, the VIN interface of the voltage regulator is externally connected to the VLDOIN terminal, the VOUT interface of the voltage regulator is externally connected to the VLDOOUT terminal, and an external capacitor C6 is connected between the VIN interface and the VLDOIN terminal of the voltage regulator. Both the capacitor C6 and the GND interface of the voltage regulator are grounded.

[0017] Furthermore, the external UART communication circuit includes an RXO / P11 terminal and a TXO / P10 terminal. The 4th interface of the connector J1 is connected to the TXO / P10 terminal, the 5th interface of the connector J1 is connected to the RXO / P11 terminal, the TXO / P10 terminal is connected to the 5th interface of the radar sensing module, and the RXO / P11 terminal is connected to the 4th interface of the radar sensing module.

[0018] Furthermore, the PWM control lamp circuit includes a control lamp U4. One end of the control lamp U4 is connected to the V_ANA terminal through a resistor R10, and the other end of the control lamp U4 is grounded. A capacitor C11 and the PWM0 / P4 terminal are connected between the control lamp U4 and the resistor R10, and the capacitor C11 is grounded.

[0019] The PWM0 / P4 terminal is connected to the 31 interface of the radar sensing module;

[0020] The V_ANA terminal is connected to interface 29 of the radar sensing module, and interface 28 of the radar sensing module is connected between the V_ANA terminal and interface 29 of the radar sensing module via a capacitor.

[0021] Furthermore, it also includes antenna U2, wherein interface 1 of antenna U2 is externally connected to the TX_ANT terminal, and interface 2 of antenna U2 is externally connected to the RX_ANT terminal;

[0022] The RX_ANT terminal is connected to interface 25 of the radar sensing module via a capacitor, and the TX_ANT terminal is connected to interface 16 of the radar sensing module via a capacitor.

[0023] An external capacitor C14 is connected between the capacitor and the 25 interface of the radar sensing module. The capacitor C14 is grounded through an inductor L1. An external inductor L2 is connected between the capacitor and the 16 interface of the radar sensing module. The inductor L2 is grounded.

[0024] Furthermore, it also includes a crystal oscillator, with its X1 interface connected to the OSC_P terminal, its X2 interface connected to the OSC_N terminal, its GND interface grounded, its OSC_P terminal connected to the 13 interface of the radar sensing module, and its OSC_N terminal connected to the 14 interface of the radar sensing module.

[0025] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0026] The circuit in this invention, relying on the program of the motherboard, can achieve two functions: one is power saving and energy saving, and the other is safety protection against human injury. The radar sensing module has the function of sensing the human body and then sends a signal to the motherboard, which performs the two functions through the program. It mainly acts as a sensor switch. It can be set to control the water dispenser to start working when a person approaches the radar detection range, and to control the water dispenser to enter sleep mode after the person leaves the radar detection range and meets the set time. In addition, it can also be set to control the water dispenser to pause the disinfection function when a person approaches the radar detection range, and to control the water dispenser to resume disinfection after the person leaves the radar detection range and meets the set time. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is the overall circuit block diagram of this utility model;

[0029] Figure 2 This is a circuit diagram of the entire utility model;

[0030] Figure 3 This is a circuit diagram of the radar sensing module of this utility model;

[0031] Figure 4 This is a circuit diagram of the analog switch circuit and the external UART communication circuit of this utility model;

[0032] Figure 5 This is a circuit diagram of the PWM control lamp circuit of this utility model;

[0033] Figure 6 This is a circuit diagram of the power supply circuit of this utility model. Figure 1 ;

[0034] Figure 7 This is a circuit diagram of the power supply circuit of this utility model. Figure 2 ;

[0035] Figure 8 This is a circuit diagram of the antenna of this utility model;

[0036] Figure 9 This is a circuit diagram of the crystal oscillator of this utility model;

[0037] In the diagram: 1. Radar sensing module; 2. External UART communication circuit; 3. Analog switch circuit; 4. PWM control lamp circuit; 5. Power supply circuit; 6. Antenna; 7. Crystal oscillator. Detailed Implementation

[0038] 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.

[0039] like Figures 1-9As shown, this utility model provides a technical solution: a contactless sensing safety protection circuit for a microwave radar human sensing module, including a radar sensing module 1, an external UART communication circuit 2, an analog switch circuit 3, a PWM control lamp circuit 4, and a power supply circuit 5. The power supply circuit 5, the external UART communication circuit 2, the analog switch circuit 3, and the PWM control lamp circuit 4 are electrically connected to the radar sensing module 1. The analog switch circuit 3 includes a connector J1. The 3-pin connector of the connector J1 is connected to the OUT terminal. The OUT terminal is connected to the PWM2_5V / P6 interface of the radar sensing module 1 through a resistor R2. An external resistor R1 is connected between the 3-pin connector of the connector J1 and the OUT terminal. The resistor R1 is connected to the 19-pin connector of the radar sensing module 1 through the FILT_VO terminal. An external capacitor C3 is connected between the FILT_VO terminal and the 19-pin connector of the radar sensing module 1. The capacitor C3 is grounded. The connector J1 has its interface 1 connected to the VLODIN terminal. An external resistor R20 is connected between the connector J1's interface 3 and the OUT terminal. The resistor R20, the base (B) and collector (C) of the NPN transistor Q8, the indicator LED1, the resistor R21, and the VLODIN terminal are connected in series. The emitter (E) of the NPN transistor Q8 is connected to an external resistor R22. The resistor R22 is electrically connected between the resistor R20 and the base (B) of the NPN transistor Q8. The connection between the emitter (E) of the NPN transistor Q8 and the resistor R22 is grounded. The radar sensing module 1's VRAT_A interface is connected to the VLOOUT terminal via a resistor R5. An external capacitor C7 is connected between the radar sensing module 1's VRAT_A interface and the resistor R5. The capacitor C7 is grounded. The radar sensing module 1 uses a 5.8GHz microwave radar human detection module IC: 58S32-2128BC.

[0040] In one embodiment, the power supply circuit 5 includes a resistor R7, one end of which is externally connected to the VLDOIN terminal, and the other end of which is externally connected to the VLDOOUT terminal.

[0041] In one embodiment, the power supply circuit 5 includes a voltage regulator. The VIN interface of the voltage regulator is connected to the VLDOIN terminal, and the VOUT interface of the voltage regulator is connected to the VLDOOUT terminal. An external capacitor C6 is connected between the VIN interface and the VLDOIN terminal of the voltage regulator. Both the capacitor C6 and the GND interface of the voltage regulator are grounded.

[0042] In one embodiment, the external UART communication circuit 2 includes an RXO / P11 terminal and a TXO / P10 terminal. Interface 4 of the connector J1 is connected to the TXO / P10 terminal, and interface 5 of the connector J1 is connected to the RXO / P11 terminal. The TXO / P10 terminal is connected to interface 5 of the radar sensing module 1, and the RXO / P11 terminal is connected to interface 4 of the radar sensing module 1. Note: TXO / P10 and RXO / P11 are 3.3V ports; please ensure proper matching when designing the peripheral circuit.

[0043] In one embodiment, the PWM control lamp circuit 4 includes a control lamp U4. One end of the control lamp U4 is externally connected to the V_ANA terminal through a resistor R10, and the other end of the control lamp U4 is grounded. A capacitor C11 and a PWM0 / P4 terminal are externally connected between the control lamp U4 and the resistor R10, and the capacitor C11 is grounded. The PWM0 / P4 terminal is connected to the 31 interface of the radar sensing module 1. The V_ANA terminal is connected to the LDO_ANA interface of the radar sensing module 1, and the RST interface of the radar sensing module 1 is connected between the V_ANA terminal and the LDO_ANA interface of the radar sensing module 1 through a capacitor.

[0044] In one embodiment, an antenna U2 is further included. Interface 1 of the antenna U2 is externally connected to the TX_ANT terminal, and interface 2 of the antenna U2 is externally connected to the RX_ANT terminal. The RX_ANT terminal is connected to the RX interface of the radar sensing module 1 via a capacitor, and the TX_ANT terminal is connected to the PA_OUT interface of the radar sensing module 1 via a capacitor. An external capacitor C14 is connected between the capacitor and the RX interface of the radar sensing module 1, and the capacitor C14 is grounded via an inductor L1. An external inductor L2 is connected between the capacitor and the PA_OUT interface of the radar sensing module 1, and the inductor L2 is grounded.

[0045] In one embodiment, the system further includes a crystal oscillator 7, wherein the X1 interface of the crystal oscillator 7 is externally connected to the OSC_P terminal, the X2 interface of the crystal oscillator 7 is externally connected to the OSC_N terminal, the GND interface of the crystal oscillator 7 is grounded, the OSC_P terminal is connected to the SOC_P interface of the radar sensing module 1, and the OSC_N terminal is connected to the SOC_N interface of the radar sensing module 1.

[0046] Specific working principle:

[0047] In the circuit of this utility model, connector J1 is the external interface part, RX0 and TX0 are the external communication interfaces, and the OUT terminal is a single-channel control output, such as turning on the main power supply.

[0048] When no one is nearby, only this radar sensing module 1 operates with extremely low power consumption. When a human body is detected, the OUT terminal will be turned on, the main power supply will be turned on, and the high power consumption circuit will be turned on, so as to extend the life or save energy and reduce consumption.

[0049] The NPN transistor Q8 circuit section serves as a digital output current amplifier, providing a larger drive current to drive external circuits.

[0050] ANT stands for antenna;

[0051] For the power supply, you can choose either 5V or 3.3V; Figure 7 It is an LDO linear regulator unit that can convert the input voltage to 3.3V; Figure 6 0 ohms means soldering uses 5V, no soldering means using Figure 7 LDO in;

[0052] This circuit, relying on the program of the motherboard, can perform two functions: one is to save power and energy, and the other is to protect the human body from harm. The radar sensing module 1 has the function of sensing the human body, and then sends a signal to the motherboard, which performs the two functions through the program.

[0053] The circuit in this invention mainly functions as a sensor switch. It can be set to turn on the water dispenser when a person approaches the radar detection range, and to put the water dispenser into sleep mode after a set time has elapsed since the person leaves the radar detection range. Alternatively, it can be set to pause the disinfection function of the water dispenser when a person approaches the radar detection range, and to restart the disinfection function after a set time has elapsed since the person leaves the radar detection range.

[0054] When this circuit is used as an automatic energy-saving system of microwave radar human detection module, after the water dispenser has finished working and no moving object is detected within the sensing range of microwave radar human detection module, the system will automatically enter a sleep state after a set time. All electrical components of the water dispenser will operate at the lowest power consumption. When someone approaches or uses the water dispenser, the microwave radar human detection module circuit will immediately wake up the main system of the water dispenser, thereby achieving the automatic energy-saving effect of the water dispenser and improving the service life of electrical components.

[0055] When this circuit is used as an automatic proximity safety protection system for the microwave radar human detection module, it acts as a sensor switch during the water dispenser's disinfection process. When a passerby approaches the 5.8GHz microwave radar human detection module's sensing range and the water dispenser system is automatically disinfecting and discharging water, the system will immediately shut off the voltage to the disinfection valve and all water outlet solenoid valves, closing the disinfection and water outlet valves. Simultaneously, the system will issue a voice prompt: "Do not approach during high-temperature disinfection," thus providing protection against burns from close proximity. The system will resume disinfection after 60 seconds once the passerby leaves the safe range of the 5.8GHz microwave radar human detection module.

[0056] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A contactless sensing safety protection circuit for a microwave radar human-sensing module, comprising a radar sensing module (1), an external UART communication circuit (2), an analog switch circuit (3), a PWM control lamp circuit (4), and a power supply circuit (5), characterized in that: The power supply circuit (5), external UART communication circuit (2), analog switch circuit (3) and PWM control lamp circuit (4) are electrically connected to the radar sensing module (1) respectively; The analog switch circuit (3) includes a connector J1, whose 3-pin interface is connected to the OUT terminal, and the OUT terminal is connected to the 6-pin interface of the radar sensing module (1) through a resistor R2. An external resistor R1 is connected between the 3rd interface and the OUT terminal of the connector J1. The resistor R1 is connected to the 19th interface of the radar sensing module (1) through the FILT_VO terminal. An external capacitor C3 is connected between the FILT_VO terminal and the 19 interface of the radar sensing module (1), and the capacitor C3 is grounded.

2. The contactless sensing safety protection circuit for a microwave radar human detection module according to claim 1, characterized in that: The connector J1 has a VLODIN terminal connected to its 1st interface, and an external resistor R20 is connected between the connector J1's 3rd interface and the OUT terminal. The resistor R20, the base of the NPN transistor Q8, the collector of the NPN transistor Q8, the LED1 indicator, the resistor R21, and the VLDOIN terminal are connected in series. The emitter of the NPN transistor Q8 is connected to an external resistor R22. The resistor R22 is electrically connected between the resistor R20 and the base of the NPN transistor Q8. The connection between the emitter of the NPN transistor Q8 and the resistor R22 is grounded. The 32 interface of the radar sensing module (1) is connected to the VLDOOUT terminal through resistor R5. A capacitor C7 is connected between the 32 interface of the radar sensing module (1) and resistor R5. The capacitor C7 is grounded.

3. The contactless sensing safety protection circuit for a microwave radar human detection module according to claim 2, characterized in that: The power supply circuit (5) includes a resistor R7, one end of which is connected to the VLDOIN terminal and the other end of which is connected to the VLDOOUT terminal.

4. The contactless sensing safety protection circuit for a microwave radar human detection module according to claim 2, characterized in that: The power supply circuit (5) includes a voltage regulator. The VIN interface of the voltage regulator is connected to the VLDOIN terminal, and the VOUT interface of the voltage regulator is connected to the VLDOOUT terminal. An external capacitor C6 is connected between the VIN interface and the VLDOIN terminal of the voltage regulator. Both the capacitor C6 and the GND interface of the voltage regulator are grounded.

5. The contactless sensing safety protection circuit for a microwave radar human detection module according to claim 2, characterized in that: The external UART communication circuit (2) includes an RXO / P11 terminal and a TXO / P10 terminal. The 4th interface of the connector J1 is connected to the TXO / P10 terminal, the 5th interface of the connector J1 is connected to the RXO / P11 terminal, the TXO / P10 terminal is connected to the 5th interface of the radar sensing module (1), and the RXO / P11 terminal is connected to the 4th interface of the radar sensing module (1).

6. The contactless sensing safety protection circuit for a microwave radar human detection module according to claim 2, characterized in that: The PWM control lamp circuit (4) includes a control lamp U4. One end of the control lamp U4 is connected to the V_ANA terminal through a resistor R10. The other end of the control lamp U4 is grounded. A capacitor C11 and the PWM0 / P4 terminal are connected between the control lamp U4 and the resistor R10. The capacitor C11 is grounded. The PWM0 / P4 terminal is connected to the 31 interface of the radar sensing module (1); The V_ANA terminal is connected to the 29 interface of the radar sensing module (1), and the 28 interface of the radar sensing module (1) is connected between the V_ANA terminal and the 29 interface of the radar sensing module (1) through a capacitor.

7. The contactless sensing safety protection circuit for a microwave radar human detection module according to claim 2, characterized in that: It also includes an antenna (6), wherein interface 1 of the antenna (6) is connected to the TX_ANT terminal and interface 2 of the antenna (6) is connected to the RX_ANT terminal; The RX_ANT terminal is connected to the 25 interface of the radar sensing module (1) via a capacitor, and the TX_ANT terminal is connected to the 16 interface of the radar sensing module (1) via a capacitor. An external capacitor C14 is connected between the capacitor and the 25 interface of the radar sensing module (1). The capacitor C14 is grounded through an inductor L1. An external inductor L2 is connected between the capacitor and the 16 interface of the radar sensing module (1). The inductor L2 is grounded.

8. The contactless sensing safety protection circuit for a microwave radar human detection module according to claim 2, characterized in that: It also includes a crystal oscillator (7), the X1 interface of the crystal oscillator (7) is connected to the OSC_P terminal, the X2 interface of the crystal oscillator (7) is connected to the OSC_N terminal, the GND interface of the crystal oscillator (7) is grounded, the OSC_P terminal is connected to the 13 interface of the radar sensing module (1), and the OSC_N terminal is connected to the 14 interface of the radar sensing module (1).

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