Nursing alarm circuit and device

Abstract

The utility model provides a nursing alarm circuit and device, the circuit comprises a power supply part, a light control part and a sound control part, the power supply part comprises a voltage conversion unit, a filtering unit and an electromagnetic compatibility unit; the sound control part comprises a stereo audio power amplifier unit and a loudspeaker interface unit; the light control part comprises a signal isolation unit and a relay unit. The device comprises a PCB (Printed Circuit Board), and the nursing alarm circuit is arranged on the PCB. Through more flexible and diversified alarm control functions, the scheme overcomes the problems of single control function, fixed alarm form and the like, ensures timely monitoring and effective warning of vital sign abnormity of the old people, and improves the safety of places such as nursing homes and the like and the health protection level of the old people.

Description

Technical Field

[0001] This application relates to the field of circuits, and particularly to an alarm circuit and corresponding device for indoor personnel caretaking. Background Art

[0002] An alarm controller is a device used for real-time monitoring and response to abnormal situations, and is widely applied in various security and protection systems. Especially in the elderly vital signs caretaking system, the alarm controller plays a key role, capable of promptly emitting sound and light signals to remind the caretaking personnel to pay attention to the elderly's condition and conduct emergency treatment.

[0003] Traditional alarm controllers often have some limitations, such as single control functions, fixed alarm forms, etc. To overcome these problems, we designed an alarm circuit for indoor personnel caretaking, providing more flexible and diverse alarm control functions. Summary of the Invention

[0004] This application provides an alarm circuit and device for caretaking, which solves the problem of single alarm in the prior art, provides multi-functional and flexible variable alarm control, ensures timely monitoring and effective warning of abnormal vital signs of the elderly, and improves the safety level of places such as nursing homes and the health protection level of the elderly.

[0005] To solve the above technical problems, the embodiments of this application disclose the following technical solutions:

[0006] In a first aspect, this application provides an alarm circuit for caretaking, including a power supply part, a lighting control part, and a sound control part. The power supply part includes:

[0007] A voltage conversion unit for providing 5V0 voltage to the sound control part and the lighting control part;

[0008] A filtering unit for filtering out AC signals;

[0009] An electromagnetic compatibility processing unit for isolating electromagnetic interference from the external environment to the voltage part;

[0010] The sound control part includes:

[0011] A stereo audio power amplifier unit for receiving control instructions and generating audio signals;

[0012] A speaker interface unit for connecting to audio devices and playing audio signals;

[0013] The lighting control part includes:

[0014] A signal isolation unit, using an optocoupler as the core device, while receiving and outputting control instructions, realizing isolation between the input signal and the output signal;

[0015] A relay unit for receiving the output signal of the signal isolation unit and performing lighting control.

[0016] In a possible implementation, the buck chip of the voltage conversion unit is MORNSUN's URB2405YMD-10WR3. The buck chip includes an input pin Vin, a ground pin GND, an output pin +Vo, an output pin 0V, and a control pin Crtl.

[0017] In a possible implementation, the filtering unit includes a polarized capacitor C1, capacitors C2, C4, C5, a polarized capacitor C6, capacitors C7, and an inductor L1. The positive electrode of the polarized capacitor C1 is connected to the 24V DC voltage, and the negative electrode of the polarized capacitor C1 is connected to HGND. The two ends of the capacitor C2 are respectively connected to the 24V DC voltage and HGND. The positive electrode of the polarized capacitor C4 is connected to the 24V DC voltage, and the negative electrode of the polarized capacitor C4 is connected to HGND. The two ends of the capacitor C5 are respectively connected to the 24V DC voltage and HGND. The positive electrode of the polarized capacitor C6 is connected to the input pin Vin of the buck chip, and the negative electrode of the polarized capacitor C6 is connected to HGND. The two ends of the capacitor C7 are respectively connected to the output pin +Vo and GND of the buck chip. One end of the inductor L1 is connected to the 24V DC voltage, and the other end of the inductor L1 is connected to the input pin Vin of the buck chip.

[0018] In a possible implementation, the electromagnetic compatibility processing unit includes a self-recovery fuse F1, capacitors C3, C8, and a resistor R7. One end of the self-recovery fuse F1 is connected to the IN 24V input, and the other end of the self-recovery fuse F1 is connected to the positive electrode of the polarized capacitor C1. The two ends of the capacitor C3 are respectively connected to the input pin Vin of the buck chip and the output pin +Vo of the buck chip. The two ends of the capacitor C8 are respectively connected to the ground pin GND of the buck chip and the output pin 0V of the buck chip. The two ends of the resistor R7 are respectively connected to GND and PGND.

[0019] In a possible implementation, the signal isolation unit includes:

[0020] A first optocoupler OC1. The first pin of the first optocoupler OC1 is connected to the 5V0 voltage through a resistor R1. The second pin of the first optocoupler OC1 is connected to the positive electrode of the light-emitting diode LED1. The third pin of the first optocoupler OC1 outputs a control signal Ctrl-1. The fourth pin of the first optocoupler OC1 is connected to the 5V0 voltage. The negative electrode of the light-emitting diode LED1 is connected to the 5V0 voltage through a resistor R3, and the negative electrode of the light-emitting diode LED1 serves as the input end for obtaining the control signal Ctrl-1.

[0021] The second optocoupler OC2, the first pin of the second optocoupler OC2 is connected to the 5V0 voltage through the resistor R4, the second pin of the second optocoupler OC2 is connected to the positive electrode of the light-emitting diode LED2, the third pin of the second optocoupler OC2 outputs the control signal Ctrl-2, and the fourth pin of the second optocoupler OC2 is connected to the 5V0 voltage; the negative electrode of the light-emitting diode LED2 is connected to the 5V0 voltage through the resistor R6, and the negative electrode of the light-emitting diode LED2 is used as the input terminal for obtaining the control signal Ctrl-2;

[0022] The third optocoupler OC3, the first pin of the third optocoupler OC3 is connected to the 5V0 voltage through the resistor R8, the second pin of the third optocoupler OC3 is connected to the positive electrode of the light-emitting diode LED3, the third pin of the third optocoupler OC3 outputs the control signal Ctrl-3, and the fourth pin of the third optocoupler OC3 is connected to the 5V0 voltage; the negative electrode of the light-emitting diode LED3 is connected to the 5V0 voltage through the resistor R10, and the negative electrode of the light-emitting diode LED3 is used as the input terminal for obtaining the control signal Ctrl-3.

[0023] In a possible implementation, the relay unit includes:

[0024] The first relay K1, the output terminal of the first relay K1 is connected to the interface J3, and the two input terminals of the first relay K1 are respectively connected to the collector of the triode Q1 and GND; the collector of the triode Q1 is connected to the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected to GND; the emitter of the triode Q1 is connected to the 5V0 voltage, and the base of the triode Q1 is connected to the third pin of the first optocoupler OC1 through the resistor R2;

[0025] The second relay K2, the output terminal of the second relay K2 is connected to the interface J4, and the two input terminals of the second relay K2 are respectively connected to the collector of the triode Q2 and GND; the collector of the triode Q2 is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected to GND; the emitter of the triode Q2 is connected to the 5V0 voltage, and the base of the triode Q2 is connected to the third pin of the second optocoupler OC2 through the resistor R5;

[0026] The third relay K3, the output terminal of the third relay K3 is connected to the interface J6, and the two input terminals of the third relay K3 are respectively connected to the collector of the triode Q3 and GND; the collector of the triode Q3 is connected to the negative electrode of the diode D3, and the positive electrode of the diode D3 is connected to GND; the emitter of the triode Q3 is connected to the 5V0 voltage, and the base of the triode Q3 is connected to the third pin of the third optocoupler OC3 through the resistor R9.

[0027] In a possible implementation, the stereo audio power amplifier unit includes a stereo audio amplification chip U3, a linear potentiometer U2, resistors R11, R12, capacitors C9, C11, C12, C14, C10, C13, C15. The VDD pin of the stereo audio amplification chip U3 is connected to GND through capacitor C12, the VREF pin of the stereo audio amplification chip U3 is connected to GND through capacitor C14, both PVDD pins of the stereo audio amplification chip U3 are connected to the MUTE pin of the stereo audio amplification chip U3, both GND pins of the stereo audio amplification chip U3 are connected to GND, both PGND pins of the stereo audio amplification chip U3 are connected to PGND, the -OUT_L and +OUT_L pins of the stereo audio amplification chip U3 output the left-channel audio, the -OUT_R and +OUT_R pins of the stereo audio amplification chip U3 output the right-channel audio, the INL pin of the stereo audio amplification chip U3 is connected to the 5th pin of the linear potentiometer U2 through the sequentially connected capacitor C13 and resistor R11, the INR pin of the stereo audio amplification chip U3 is connected to the 2nd pin of the linear potentiometer U2 through the sequentially connected capacitor C15 and resistor R12; the 1st pin of the linear potentiometer U2 is used to obtain the right-channel input signal, the 4th pin of the linear potentiometer U2 is used to obtain the left-channel input signal, the 3rd and 6th pins of the linear potentiometer U2 are both connected to GND, the 8th pin of the linear potentiometer U2 is connected to the 5V0 voltage, the 7th pin of the linear potentiometer U2 is connected to the MUTE pin of the stereo audio amplification chip U3; both ends of capacitor C9 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND; both ends of capacitor C10 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND; both ends of capacitor C11 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND.

[0028] In a second aspect, the present application provides a care alarm device, including:

[0029] A PCB board, on which the above-mentioned care alarm circuit is provided.

[0030] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0031] The alarm controller circuit of the present utility model combines multiple settings such as filtering, electromagnetic compatibility, and signal isolation, enabling the circuit to have good signal isolation performance, effectively resisting external interference signals, and ensuring the accuracy and stability of alarm signals. This feature is particularly important for the elderly vital sign care system, ensuring that the system can reliably detect the abnormal conditions of the elderly and promptly send out alarm signals to remind the caregivers to take corresponding measures.

[0032] By designing a proprietary lighting control section and a sound control section, where the lighting control is divided into three paths and the sound control can also generate stereo sound, it provides multifunctional and flexible variable alarm control, ensuring timely monitoring and effective warning of abnormal vital signs of the elderly, and enhancing the safety of places such as nursing homes and the level of health protection for the elderly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments in accordance with the present application, and are used together with the specification to explain the principles of the present application.

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 Schematic diagram of the principle of a nursing alarm circuit provided by an embodiment of the present application;

[0036] Figure 2 Schematic diagram of the circuit principle of the power supply part;

[0037] Figure 3 Schematic diagram of the circuit principle of the lighting control part;

[0038] Figure 4 Schematic diagram of the circuit principle of the sound control part;

[0039] Figure 5 Schematic diagram of the layout of the top layer of the PCB board;

[0040] Figure 6 Schematic diagram of the layout of the bottom layer of the PCB board;

[0041] Figure 7 Schematic diagram of the wiring of the top layer of the PCB board;

[0042] Figure 8 Schematic diagram of the wiring of the bottom layer of the PCB board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0044] To better understand the present application, the following will combine with the attached drawings to explain in detail the implementation manner of the present application.

[0045] Embodiment 1

[0046] See Figure 1 , the present application provides a nursing alarm circuit, including a power supply part, a lighting control part and a sound control part. The power supply part includes:

[0047] A voltage conversion unit for providing a 5V0 voltage to the sound control part and the lighting control part;

[0048] A filtering unit for filtering out AC signals;

[0049] An electromagnetic compatibility processing unit for isolating the electromagnetic interference of the external environment on the voltage part;

[0050] The sound control part includes:

[0051] A stereo audio power amplifier unit for receiving control instructions and generating audio signals;

[0052] A speaker interface unit for connecting to an audio device and playing the audio signal;

[0053] The lighting control part includes:

[0054] A signal isolation unit, using an optocoupler as the core device, while receiving and outputting control instructions, realizing the isolation of input signals and output signals;

[0055] A relay unit for receiving the output signal of the signal isolation unit and performing lighting control.

[0056] See Figure 2 , the circuit principle of the power supply part is:

[0057] To ensure the stability and reliability of the power supply, the voltage conversion unit uses an adapter with a specification of 24V / 2A for power supply, and then converts the 24V power supply into a 5V power supply through a power conversion chip to supply each functional module.

[0058] The DC / DC buck chip of the voltage conversion unit uses MORNSUN's URB2405YMD-10WR3, which has an ultra-wide voltage input range of 4:1, an efficiency as high as 88%, a maximum output current of 2A, an output voltage of 5V, and has input voltage protection, output overvoltage, overcurrent, and short-circuit protection functions. The buck chip includes an input pin Vin, a ground pin GND, an output pin +Vo, an output pin 0V, and a control pin Crtl.

[0059] The filtering unit includes polarized capacitor C1, capacitor C2, polarized capacitor C4, capacitor C5, polarized capacitor C6, capacitor C7, and inductor L1. Capacitor C1 is the CA45-C035K106T of Xiangyee, capacitor C2 is the GRM188B31H104KA92D of Murata Manufacturing, capacitors C4 and C6 are the EEEFT1H331AP of Panasonic, capacitor C5 is the GRM32RR71H105KA01L of Murata Manufacturing, inductor L1 is the CMH160808B4R7MT of Guangdong Fenghua Hi-Tech Co., Ltd., and capacitor C7 is the CC0603MRX5R6BB106 of YAGEO.

[0060] The electromagnetic compatibility processing unit includes self-resetting fuse F1, capacitor C3, capacitor C8, and resistor R7. Self-resetting fuse F1 is the SMD050F-2 of Littelfuse, capacitors C3 and C8 are the CK45-B3DD102KYNNA of TDK, and resistor R7 is the ERJ3GEY0R00V of Panasonic.

[0061] See Figure 3 , and the circuit principle of the lighting control part is as follows:

[0062] The control signals Ctrl-1, Ctrl-2, and Ctrl-3 are obtained through interface J1. The signal isolation unit includes:

[0063] The first optocoupler OC1. The first pin of the first optocoupler OC1 is connected to the 5V0 voltage through resistor R1, the second pin of the first optocoupler OC1 is connected to the positive electrode of light-emitting diode LED1, the third pin of the first optocoupler OC1 outputs the control signal Ctrl-1, and the fourth pin of the first optocoupler OC1 is connected to the 5V0 voltage; the negative electrode of light-emitting diode LED1 is connected to the 5V0 voltage through resistor R3, and the negative electrode of light-emitting diode LED1 serves as the input terminal for obtaining the control signal Ctrl-1;

[0064] The second optocoupler OC2. The first pin of the second optocoupler OC2 is connected to the 5V0 voltage through resistor R4, the second pin of the second optocoupler OC2 is connected to the positive electrode of light-emitting diode LED2, the third pin of the second optocoupler OC2 outputs the control signal Ctrl-2, and the fourth pin of the second optocoupler OC2 is connected to the 5V0 voltage; the negative electrode of light-emitting diode LED2 is connected to the 5V0 voltage through resistor R6, and the negative electrode of light-emitting diode LED2 serves as the input terminal for obtaining the control signal Ctrl-2;

[0065] The third optocoupler OC3, the first pin of the third optocoupler OC3 is connected to the 5V0 voltage through the resistor R8, the second pin of the third optocoupler OC3 is connected to the positive electrode of the light-emitting diode LED3, the third pin of the third optocoupler OC3 outputs the control signal Ctrl-3, and the fourth pin of the third optocoupler OC3 is connected to the 5V0 voltage; the negative electrode of the light-emitting diode LED3 is connected to the 5V0 voltage through the resistor R10, and the negative electrode of the light-emitting diode LED3 is used as the input terminal to obtain the control signal Ctrl-3.

[0066] Among them, OC1, OC2, and OC3 use PC817B of HXYMOSFET, R1, R4, and R8 use SY0603BD1KP of Sanyear, R3, R6, and R10 use SY0603BD1KP of Sanyear, and LED1, LED2, and LED3 use 19-217 / BHC-ZM1N2TY / 3T of EVERLIGHT.

[0067] The relay unit includes:

[0068] The first relay K1, the output terminal of the first relay K1 is connected to the interface J3, and the two input terminals of the first relay K1 are respectively connected to the collector of the triode Q1 and GND; the collector of the triode Q1 is connected to the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected to GND; the emitter of the triode Q1 is connected to the 5V0 voltage, and the base of the triode Q1 is connected to the third pin of the first optocoupler OC1 through the resistor R2;

[0069] The second relay K2, the output terminal of the second relay K2 is connected to the interface J4, and the two input terminals of the second relay K2 are respectively connected to the collector of the triode Q2 and GND; the collector of the triode Q2 is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected to GND; the emitter of the triode Q2 is connected to the 5V0 voltage, and the base of the triode Q2 is connected to the third pin of the second optocoupler OC2 through the resistor R5;

[0070] The third relay K3, the output terminal of the third relay K3 is connected to the interface J6, and the two input terminals of the third relay K3 are respectively connected to the collector of the triode Q3 and GND; the collector of the triode Q3 is connected to the negative electrode of the diode D3, and the positive electrode of the diode D3 is connected to GND; the emitter of the triode Q3 is connected to the 5V0 voltage, and the base of the triode Q3 is connected to the third pin of the third optocoupler OC3 through the resistor R9.

[0071] Among them, K1, K2, and K3 use 1721150-5 of TE CONNECTIVITY, R2, R5, and R9 use SY0603BD1KP of Sanyear, and the freewheeling diodes D1, D2, and D3 use 1N5817W of TWGMC.

[0072] See Figure 4 , the circuit principle of the sound control part is as follows:

[0073] The left and right channel signals are obtained through interface J5. The stereo audio power amplifier unit includes a stereo audio amplifier chip U3, a linear potentiometer U2, a resistor R11, a resistor R12, a capacitor C9, a capacitor C11, a capacitor C12, a capacitor C14, a capacitor C10, a capacitor C13, and a capacitor C15. The VDD pin of the stereo audio amplifier chip U3 is connected to GND through capacitor C12. The VREF pin of the stereo audio amplifier chip U3 is connected to GND through capacitor C14. The two PVDD pins of the stereo audio amplifier chip U3 are both connected to the MUTE pin of the stereo audio amplifier chip U3. The two GND pins of the stereo audio amplifier chip U3 are both connected to GND. The two PGND pins of the stereo audio amplifier chip U3 are both connected to PGND. The -OUT_L and +OUT_L pins of the stereo audio amplifier chip U3 output the left-channel audio. The -OUT_R and +OUT_R pins of the stereo audio amplifier chip U3 output the right-channel audio. The INL pin of the stereo audio amplifier chip U3 is connected to the 5th pin of the linear potentiometer U2 through a series connection of capacitor C13 and resistor R11 in sequence. The INR pin of the stereo audio amplifier chip U3 is connected to the 2nd pin of the linear potentiometer U2 through a series connection of capacitor C15 and resistor R12. The 1st pin of the linear potentiometer U2 is used to obtain the right-channel input signal. The 4th pin of the linear potentiometer U2 is used to obtain the left-channel input signal. The 3rd and 6th pins of the linear potentiometer U2 are both connected to GND. The 8th pin of the linear potentiometer U2 is connected to the 5V0 voltage. The 7th pin of the linear potentiometer U2 is connected to the MUTE pin of the stereo audio amplifier chip U3. The two ends of capacitor C9 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND. The two ends of capacitor C10 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND. The two ends of capacitor C11 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND.

[0074] In real life, the above circuit exists as a subordinate execution circuit. The entire care system consists of a PC, a Doppler radar detection device, a Raspberry Pi data processing device (hereinafter referred to as Raspberry Pi), and an alarm device.

[0075] The Doppler radar detection device uses a non-contact detection method of Doppler radar to detect the vital sign signals of the elderly and transmits the vital sign signal data to the PC. After the data is processed by the processor, it can effectively judge the current state of the elderly. Once an abnormality occurs, such as an emergency situation where the elderly's breathing stops or the elderly gets out of bed for a long time at night, the Raspberry Pi data processing device will receive the instruction transmitted from the PC and drive the alarm device to emit a sound or light alarm signal to obtain emergency assistance from the nursing staff.

[0076] The Doppler radar detection device communicates with the Raspberry Pi directly, and the Raspberry Pi communicates with the alarm device directly.

[0077] During communication, the following parameter configurations are written to the TF card of the Raspberry Pi to configure the network connection (example):

[0078] SSID: {wifi_name}

[0079] PASSWORD: {012345678}

[0080] eth0: {192.168.0.120}

[0081] wlan0: {192.168.0.121}

[0082] PORT: {1680}

[0083] The Raspberry Pi receives instructions from the PC and executes corresponding actions to drive the alarm device according to the instructions. The setting principle is as follows:

[0084] (1) Set instruction requirements

[0085] Set instruction (Central PC → Alarm device)

[0086]

[0087] Set instruction identification code: "W" (0x57);

[0088] Instruction content: The set instruction is represented by a 1-byte bit string;

[0089] For the instruction content, please refer to (3) Instruction code requirements;

[0090] Instruction response (Alarm device → Central PC);

[0091] · Normal response

[0092]

[0093] · Abnormal response

[0094]

[0095] (2) Alarm device status query instruction

[0096] Query the current status of the alarm device (Central PC → Alarm device)

[0097]

[0098] Instruction identification code: "R" (0x52)

[0099] Instruction Response (Alarm Device → Central PC)

[0100]

[0101] Set Instruction Identification Code: "R" (0x52);

[0102] Instruction Content: The set instruction is represented by a 1-byte bit string;

[0103] For the instruction content, please refer to the requirements of (3) Instruction Codes;

[0104] (3) Instruction Code Requirements

[0105] The instruction content is represented by ON: 1, OFF: 0 of a 1-byte bit string

[0106]

[0107] Example: The instruction for the central PC to control the red and green lights of the alarm device to be always on and the speaker to play music 2 is: 0101011100001101 (0x570D), where 01010111 is the identification code and 00001101 is the instruction code.

[0108] Examples of alarm execution are as follows:

[0109] The green alarm indicator light is connected to J3, the yellow alarm indicator light is connected to J4, and the red alarm indicator light is connected to J6.

[0110] The GPIO_9, GPIO_10, and GPIO_11 pins of the Raspberry Pi are respectively connected to the ctrl-1, ctrl-2, and ctrl-3 pins of the alarm device, and the audio output of the Raspberry Pi is connected to the audio input interface J5 of the alarm device.

[0111] When there is an alarm, the Raspberry Pi plays the audio file in the TF card through the built-in software; the Raspberry Pi issues a light alarm by controlling the level states of the GPIO_9, GPIO_10, and GPIO_11 pins.

[0112] Illustrative example:

[0113] When GPIO_9 is connected to ctrl-1, when GPIO_9 is at a low level (0V), ctrl-1 is also at a low level. At this time, the voltage between pins 1 and 2 of OC1 causes the transistor to conduct, the 3-pin of PC817 outputs a high level, Q1 turns off, and the LED alarm indicator light connected to J3 goes out; conversely, when GPIO_9 is at a high level, the LED alarm indicator light connected to J3 lights up, emitting an alarm. The same applies to the LED alarm indicator lights connected to J4 and J6.

[0114] The present application also provides a nursing alarm device, including a PCB board, on which the above-mentioned nursing alarm circuit is provided.

[0115] More specifically, the PCB board adopts a double-layer stacked structure, which are the top layer and the bottom layer in sequence. Among them, both the top layer and the bottom layer are used for signal wiring of the nursing alarm device circuit board, and at the same time, they are also used for laying the GND network.

[0116] Both the top layer and the bottom layer are copper-clad for the GND network, which is used for heat dissipation and enhancing the anti-interference ability of the board.

[0117] As Figure 5 shown, in the circuit layout, the voltage conversion unit is set on the top layer, and the polarized capacitors C4, C5, C6, C7, inductor L1, electromagnetic compatibility processing unit, lighting control unit, and U2, C11, C13 of the stereo audio power amplifier unit of the filtering unit. The actual wiring design can refer to Figure 7 .

[0118] As Figure 6 shown, in the circuit layout, the polarized capacitors C1, C2 of the filtering unit, signal isolation unit, U3, C9, C10, C12, C14, C15 of the stereo audio power amplifier unit are set on the bottom layer. The actual wiring design can refer to Figure 8 .

[0119] Furthermore, the performance of the circuit board can be enhanced by the following methods:

[0120] 1) Both the top layer and the bottom layer are copper-clad for heat dissipation and enhancing the anti-interference ability of the board.

[0121] 2) Further on the basis of 1), the copper cladding on the top layer is divided into digital partition copper cladding and analog partition copper cladding, which is used to reduce the crosstalk between high-frequency and low-frequency signals.

[0122] 3) The circuit board uses FR4-TG150 material and immersion gold process, which has better physical properties and better signal transmission performance than ordinary FR4 material.

[0123] 4) In the circuit, by copper-cladding the board and placing a via array, the loop area of the signal is reduced to enhance the anti-interference ability of the board.

[0124] 5) The analog part and the digital part of the circuit board are reasonably partitioned, so that high-frequency digital signals and low-frequency analog signals are separated, further enhancing the anti-interference ability of the circuit board.

[0125] 6) Teardrops are added to the board to prevent the circuit board pads from falling off and smooth the impedance, enhancing the signal transmission performance of the circuit board.

[0126] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nursing alarm circuit, characterized in that, The described nursing alarm circuit includes a power supply part, a lighting control part, and a sound control part. The power supply part includes: A voltage conversion unit for providing a 5V0 voltage to the sound control part and the lighting control part; A filtering unit for filtering out AC signals; An electromagnetic compatibility processing unit for isolating electromagnetic interference from the external environment to the voltage part; The sound control part includes: A stereo audio power amplifier unit for receiving control instructions and generating audio signals; A speaker interface unit for connecting to audio devices and playing audio signals; The lighting control part includes: A signal isolation unit using an optocoupler as the core device to isolate the input signal and the output signal while receiving and outputting control instructions; A relay unit for receiving the output signal of the signal isolation unit and performing lighting control; The signal isolation unit includes: The first optocoupler OC1. The first pin of the first optocoupler OC1 is connected to the 5V0 voltage through the resistor R1. The second pin of the first optocoupler OC1 is connected to the positive electrode of the light-emitting diode LED1. The third pin of the first optocoupler OC1 outputs the control signal Ctrl-1. The fourth pin of the first optocoupler OC1 is connected to the 5V0 voltage. The negative electrode of the light-emitting diode LED1 is connected to the 5V0 voltage through the resistor R3, and the negative electrode of the light-emitting diode LED1 is used as the input end to obtain the control signal Ctrl-1; The second optocoupler OC2. The first pin of the second optocoupler OC2 is connected to the 5V0 voltage through the resistor R4. The second pin of the second optocoupler OC2 is connected to the positive electrode of the light-emitting diode LED2. The third pin of the second optocoupler OC2 outputs the control signal Ctrl-2. The fourth pin of the second optocoupler OC2 is connected to the 5V0 voltage. The negative electrode of the light-emitting diode LED2 is connected to the 5V0 voltage through the resistor R6, and the negative electrode of the light-emitting diode LED2 is used as the input end to obtain the control signal Ctrl-2; The third optocoupler OC3. The first pin of the third optocoupler OC3 is connected to the 5V0 voltage through the resistor R8. The second pin of the third optocoupler OC3 is connected to the positive electrode of the light-emitting diode LED3. The third pin of the third optocoupler OC3 outputs the control signal Ctrl-3. The fourth pin of the third optocoupler OC3 is connected to the 5V0 voltage. The negative electrode of the light-emitting diode LED3 is connected to the 5V0 voltage through the resistor R10, and the negative electrode of the light-emitting diode LED3 is used as the input end to obtain the control signal Ctrl-3; The relay unit includes: The first relay K1. The output end of the first relay K1 is connected to the interface J3. The two input ends of the first relay K1 are respectively connected to the collector of the triode Q1 and GND. The collector of the triode Q1 is connected to the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected to GND. The emitter of the triode Q1 is connected to the 5V0 voltage. The base of the triode Q1 is connected to the third pin of the first optocoupler OC1 through the resistor R2; The second relay K2, the output terminal of the second relay K2 is connected to the interface J4, and the two input terminals of the second relay K2 are respectively connected to the collector of the triode Q2 and GND; the collector of the triode Q2 is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected to GND; the emitter of the triode Q2 is connected to the 5V0 voltage, and the base of the triode Q2 is connected to the 3rd pin of the second optocoupler OC2 through the resistor R5; The third relay K3, the output terminal of the third relay K3 is connected to the interface J6, and the two input terminals of the third relay K3 are respectively connected to the collector of the triode Q3 and GND; the collector of the triode Q3 is connected to the negative electrode of the diode D3, and the positive electrode of the diode D3 is connected to GND; the emitter of the triode Q3 is connected to the 5V0 voltage, and the base of the triode Q3 is connected to the 3rd pin of the third optocoupler OC3 through the resistor R9; The stereo audio power amplifier unit includes a stereo audio amplification chip U3, a linear potentiometer U2, resistors R11, R12, capacitors C9, C11, C12, C14, C10, C13, C15. The VDD pin of the stereo audio amplification chip U3 is connected to GND through the capacitor C12, the VREF pin of the stereo audio amplification chip U3 is connected to GND through the capacitor C14, the two PVDD pins of the stereo audio amplification chip U3 are both connected to the MUTE pin of the stereo audio amplification chip U3, the two GND pins of the stereo audio amplification chip U3 are both connected to GND, the two PGND pins of the stereo audio amplification chip U3 are both connected to PGND, the -OUT_L and +OUT_L pins of the stereo audio amplification chip U3 output the left-channel audio, the -OUT_R and +OUT_R pins of the stereo audio amplification chip U3 output the right-channel audio, the INL pin of the stereo audio amplification chip U3 is connected to the 5th pin of the linear potentiometer U2 through the capacitor C13 and the resistor R11 connected in series in turn, the INR pin of the stereo audio amplification chip U3 is connected to the 2nd pin of the linear potentiometer U2 through the capacitor C15 and the resistor R12 connected in series once; the 1st pin of the linear potentiometer U2 is used to obtain the right-channel input signal, the 4th pin of the linear potentiometer U2 is used to obtain the left-channel input signal, the 3rd and 6th pins of the linear potentiometer U2 are both connected to GND, the 8th pin of the linear potentiometer U2 is connected to the 5V0 voltage, the 7th pin of the linear potentiometer U2 is connected to the MUTE pin of the stereo audio amplification chip U3; both ends of the capacitor C9 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND; both ends of the capacitor C10 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND; both ends of the capacitor C11 are respectively connected to the 7th pin of the linear potentiometer U2 and PGND.

2. The nursing alarm circuit according to claim 1, wherein The buck chip of the voltage conversion unit includes an input pin Vin, a ground pin GND, an output pin +Vo, an output pin 0V, and a control pin Crtl.

3. The nursing alarm circuit according to claim 2, characterized in that, The filtering unit includes a polarized capacitor C1, a capacitor C2, a polarized capacitor C4, a capacitor C5, a polarized capacitor C6, a capacitor C7, and an inductor L1. The positive electrode of the polarized capacitor C1 is connected to the 24V DC voltage, and the negative electrode of the polarized capacitor C1 is connected to HGND; both ends of the capacitor C2 are respectively connected to the 24V DC voltage and HGND; the positive electrode of the polarized capacitor C4 is connected to the 24V DC voltage, and the negative electrode of the polarized capacitor C4 is connected to HGND; both ends of the capacitor C5 are respectively connected to the 24V DC voltage and HGND; the positive electrode of the polarized capacitor C6 is connected to the input pin Vin of the buck chip, and the negative electrode of the polarized capacitor C6 is connected to HGND; both ends of the capacitor C7 are respectively connected to the output pin +Vo and GND of the buck chip; one end of the inductor L1 is connected to the 24V DC voltage, and the other end of the inductor L1 is connected to the input pin Vin of the buck chip.

4. The nursing alarm circuit according to claim 3, characterized in that, The electromagnetic compatibility processing unit includes a self - reset fuse F1, a capacitor C3, a capacitor C8, and a resistor R7. One end of the self - reset fuse F1 is connected to the IN 24V input, and the other end of the self - reset fuse F1 is connected to the positive electrode of the polarized capacitor C1; both ends of the capacitor C3 are respectively connected to the input pin Vin of the buck chip and the output pin +Vo of the buck chip; both ends of the capacitor C8 are respectively connected to the ground pin GND of the buck chip and the output pin 0V of the buck chip; both ends of the resistor R7 are respectively connected to GND and PGND.

5. A nursing alarm device, characterized in that, The device includes: A PCB board, on which the care - taking alarm circuit described in claim 1 is provided.

6. The nursing alarm device according to claim 5, characterized in that, The PCB board includes a top layer and a bottom layer. The top layer is provided with a voltage conversion unit, the polarized capacitor C4, the capacitor C5, the polarized capacitor C6, the capacitor C7, the inductor L1 of the filtering unit, the electromagnetic compatibility processing unit, the lighting control unit, U2, C11, C13 of the stereo audio power amplifier unit; the bottom layer is provided with the polarized capacitor C1, the capacitor C2 of the filtering unit, the signal isolation unit, U3, C9, C10, C12, C14, C15 of the stereo audio power amplifier unit.

7. The nursing alarm device according to claim 6, wherein Both the top layer and the bottom layer of the PCB board are copper - clad for the GND network, and the copper - clad on the top layer is divided into digital partition copper - clad and analog partition copper - clad.

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