A warning light circuit

Abstract

The utility model discloses a kind of alarm indicator light circuit, including main control unit, drive module, LED display module and power module, the signal output end of main control unit is connected with the signal input end of drive module, the signal output end of drive module is connected with the signal input end of LED display module, the drive module is used to control the specified light color and the flicker frequency of controllable LED that the LED display module sends, the power module is used to power supply to LED display module.The utility model of a kind of alarm indicator light circuit is aimed at the singleness problem on color expression of current medical equipment alarm lamp, by introducing multicolor dynamic alarm, the intuitive display of alarm information is realized, and the judgment and response speed of medical staff to equipment state is improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to an alarm indicator circuit. Background Technology

[0002] In the medical field, blood purification equipment is a crucial treatment device, and its stability and reliability are essential for ensuring patient safety and improving treatment outcomes. During use, blood purification equipment may encounter various abnormal situations, such as abnormal blood flow rate, abnormal pressure, and dialysate concentration deviating from set values. If these abnormalities are not detected and addressed promptly, they can cause irreversible harm to patients. Therefore, blood purification equipment is typically equipped with a comprehensive alarm system to quickly alert medical staff in the event of abnormalities.

[0003] In alarm systems, alarm lights, as a crucial visual indicator, directly impact the speed at which medical staff can assess and respond to equipment status. Currently, most alarm lights for blood purification equipment on the market use monochrome LEDs or small modular designs. While these provide some alarm functionality, they suffer from shortcomings in terms of luminous intensity and uniformity. Monochrome LED alarm lights offer limited color representation, failing to intuitively reflect the specific state or type of malfunction of the equipment, increasing the difficulty for medical staff in making judgments. Furthermore, small modular alarm lights often exhibit uneven light distribution, easily creating bright spots or dark areas, affecting visual perception and making it difficult for medical staff to quickly and accurately identify alarm information. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, the purpose of this utility model is to provide an alarm indicator circuit that, by introducing a multi-color dynamic alarm, addresses the issue of the single color representation of alarm lights in current medical equipment, thereby enabling intuitive display of alarm information and improving the speed at which medical personnel can judge and respond to the equipment status.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an alarm indicator circuit, comprising: a main control unit, a drive module, an LED display module, and a power supply module;

[0006] The signal output terminal of the main control unit is connected to the signal input terminal of the drive module, and the signal output terminal of the drive module is connected to the signal input terminal of the LED display module. The drive module is used to control the LED display module to emit a specified light color and control the flashing frequency of the LED.

[0007] The power supply module is used to supply power to the LED display module.

[0008] As a further improvement of this utility model, the driving module includes a terminal block P2, an electrostatic and surge protection tube D2, and a first driving unit, a second driving unit, and a third driving unit connected in parallel. The first driving unit, the second driving unit, and the third driving unit are respectively connected to the signal input terminal of the LED display module.

[0009] Pin 1 of the terminal P2 is connected to the power module and the first drive unit, pin 2 is connected to pin 1 of the electrostatic discharge and surge protection tube D2 and the second drive unit, pin 3 is connected to pin 3 of the electrostatic discharge and surge protection tube D2 and the third drive unit, and pin 2 of the electrostatic discharge and surge protection tube D2 is grounded to GND.

[0010] The main control unit is connected to pins 1, 2 and 3 of terminal P2 respectively.

[0011] As a further improvement of this utility model, the first driving unit includes resistors R14, R15, R16, and R17, transistor Q1, and transistor Q2.

[0012] The base of transistor Q2 is connected to the input terminal of the LED display module through resistor R16. The collector of transistor Q2 is connected to one end of resistor R14 and one end of resistor R15. The other end of resistor R14 is connected between resistor R16 and the LED display module. The other end of circuit R15 is connected to one end of resistor R17 and the base of transistor Q1. The emitter of transistor Q2 is connected to the other end of resistor R17 and then grounded to GND.

[0013] Pin 1 of the terminal P2 is connected to the base of transistor Q2;

[0014] The collector of transistor Q1 is connected to the output terminal of the LED display module, and the emitter of transistor Q1 is grounded to GND.

[0015] The second and third driving units have the same circuit structure as the first driving unit.

[0016] As a further improvement of this utility model, the LED display module includes a first display module, a second display module, and a third display module, which are respectively connected to the first driving unit, the second driving unit, and the third driving unit. The first driving unit controls the first display module to display a red alarm light, the second driving unit controls the second display module to display a yellow alarm light, and the third driving unit controls the third display module to display a blue alarm light.

[0017] The first display module includes multiple first light-emitting diodes connected in parallel. The cathode of each first light-emitting diode is connected in series with a first protection resistor. The anode of each first light-emitting diode is connected to the other end of resistor R14 and resistor R16 respectively. The other end of each first protection resistor is connected to the collector of transistor Q1 respectively.

[0018] The second and third display modules have the same circuit structure as the first display module.

[0019] As a further improvement of this utility model, the alarm indicator circuit achieves a gap of 3.2~5.2mm between the central axes of two adjacent first light-emitting diodes on the PCB board.

[0020] As a further improvement of this utility model, the number of the first light-emitting diodes and the first protective resistors is eight or more.

[0021] As a further improvement of this utility model, the power module includes an electrostatic and surge protection tube D1, a current limiting chip U1, a resistor R18, a resistor R36, a capacitor C1, and a terminal block P1.

[0022] Pin 1 of the electrostatic discharge and surge protection tube D1 is connected between pin 1 of terminal P2 and the first drive unit. Pin 2 is grounded to GND. Pin 3 is connected to pin 2 of terminal P1, one end of capacitor C1 and pin 5 of current limiting chip U1 respectively. The other end of capacitor C1 is grounded to GND. Pin 1 of terminal P1 is grounded to GND.

[0023] Pin 1 of the current limiting chip U1 is connected to the first driving unit, the second driving unit and the third driving unit respectively. Pin 3 is grounded to GND through resistor R18, pin 2 is grounded to GND and pin 4 is grounded to GND through resistor R36.

[0024] Compared with the prior art, this utility model has the following advantages:

[0025] 1. This utility model and an alarm indicator circuit address the problem of the single color expression of alarm lights in current medical equipment. By introducing multi-color dynamic alarm, it realizes the intuitive display of alarm information and improves the judgment and response speed of medical staff on the equipment status.

[0026] 2. This utility model and an alarm indicator circuit optimize the design of the PCB board and adjust the spacing between each group of LEDs to achieve uniform light across the entire LED strip, thereby controlling the uniformity of light in the LED display module. Attached Figure Description

[0027] Figure 1 This is a block diagram of an alarm indicator circuit system according to the present invention;

[0028] Figure 2 This is a schematic diagram of an alarm indicator circuit according to the present invention;

[0029] Figure 3 This is a schematic diagram of a power supply module for an alarm indicator circuit according to this utility model;

[0030] Figure 4 This is a schematic diagram of an alarm indicator light circuit driver module according to the present invention;

[0031] Figure 5 This is a schematic diagram of an alarm indicator LED display module according to the present invention.

[0032] Figure 6 This is a simplified PCB diagram of an alarm indicator circuit according to the present invention. Detailed Implementation

[0033] 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.

[0034] Figures 1 to 6 The diagram shown is a structural schematic of an embodiment of an alarm indicator circuit according to the present invention. Its main body includes a main control unit, a drive module, an LED display module, and a power supply module.

[0035] The signal output terminal of the main control unit is connected to the signal input terminal of the drive module. By controlling the high and low levels of the signal input terminal of the drive module through the main control unit, the blood purification equipment can emit different indicator lights in different states.

[0036] The driver module controls the LED display module to emit a specified light color and controls the LED's flashing frequency. The signal output terminal of the driver module is connected to the signal input terminal of the LED display module. This alarm indicator PCB is a separate module, connected to the main body via a wiring harness. It is powered by a 5V DC power supply, and the signal lines interact with the main control unit to control the driver module, thereby causing the LED display module to emit the specified color. Figure 4As shown, the base of Q2 is pulled high by resistor R1610kΩ, turning on transistor Q2. This causes the base of transistor Q1 to be low, turning off transistor Q1. When the drive signal input is low, the base of transistor Q2 is low, turning off transistor Q2. At this time, the base of transistor Q1 is high, turning on transistor Q1, thus illuminating the subsequent LED. Different signal lines can control the corresponding LED to be on or off, thereby displaying different colors. Specifically, the driving unit includes a terminal block P2, an electrostatic discharge (ESD) and surge protection diode D2, and a first driving unit, a second driving module, and a third driving unit connected in parallel. The first driving unit, the second driving unit, and the third driving unit are respectively connected to the signal input terminal of the LED display module. Pin 1 of the terminal block P2 is connected to the power module and the first driving unit, pin 2 is connected to pin 1 of the ESD and surge protection diode D2 and the second driving unit, and pin 3 is connected to pin 3 of the ESD and surge protection diode D2 and the third driving unit. Pin 2 of the ESD and surge protection diode D2 is grounded to GND.

[0037] The first driving unit includes resistors R14, R15, R16, and R17, transistors Q1 and Q2. The base of transistor Q2 is connected to the LED display module via resistor R16. The collector of transistor Q2 is connected to one end of resistor R14 and one end of resistor R15. The other end of resistor R14 is connected between resistor R16 and the LED display module. The other end of resistor R15 is connected to one end of resistor R17 and the base of transistor Q1. The emitter of transistor Q2 is connected to the other end of resistor R17 and then grounded to GND. Pin 1 of terminal P2 is connected to the base of transistor Q2. The collector of transistor Q1 is connected to the LED display module, and the emitter of transistor Q1 is grounded to GND. The second and third driving units have the same circuit structure as the first driving unit and will not be described in detail.

[0038] An LED display module consists of multiple LED beads, such as Figure 2As shown, the LED display module uses multiple LEDs connected in parallel, which effectively prevents the damage of one LED from affecting other LEDs. In the circuit, a protective resistor is used to stabilize the current of the LED at 20mA, so that even a small voltage change will not burn out the LED. In this embodiment, after the alarm module detects an alarm signal, the main control unit processes and switches the first drive unit, the second drive unit, and the third drive unit, thereby controlling the first display module, the second display module, and the third display module to emit a specified light color and a corresponding flashing time. Specifically, the LED display module includes a first display module, a second display module, and a third display module, which are respectively connected to the first drive unit, the second drive unit, and the third drive unit. The first drive unit controls the first display module to display a red alarm light, the second drive unit controls the second display module to display a yellow alarm light, and the third drive unit controls the third display module to display a blue alarm light; the first display module includes multiple first light-emitting diodes connected in parallel, the cathode of each first light-emitting diode is connected in series with a first protective resistor, the anode of each first light-emitting diode is connected to the other end of resistor R14 and resistor R16 respectively, and the other end of each first protective resistor is connected to the collector of transistor Q1. The second and third display modules have the same circuit structure as the first display module and will not be described in detail. The alarm indicator circuit on the PCB board has a gap of 3.2~5.2mm between the central axes of two adjacent first LEDs, preferably 3.8~4.5mm, to ensure sufficient light intensity to prevent visually dark areas. Adjusting the spacing between each group of LEDs allows the entire light strip to achieve uniform light, thereby controlling the light uniformity of the LED display module. Preferably, in this embodiment, the number of first LEDs and first protective resistors is eight or more.

[0039] The power supply module is used to supply power to the LED display module. For example... Figure 5As shown, its working principle is as follows: after the external DC power supply is electrostatically discharged through the electrostatic discharge and surge protection tube D1, it reaches the current limiting chip U1. Pin 3 IADJ of the current limiting chip U1 is a current limiting setting resistor, which is 1.2kΩ and sets the current to 0.5A. Pin 4 is the chip switch control pin, which is connected to a 10kΩ resistor to pull down to a low level, so that the chip output current is limited to a maximum of 0.5A, preventing overcurrent from burning out the LED beads. Specifically, the power module includes the electrostatic discharge and surge protection tube D1, the current limiting chip U1, resistors R18 and R36, capacitor C1, and terminal P1. Among them, the current limiting chip U1 is model PW1515. Pin 1 of the electrostatic discharge and surge protection tube D1 is connected between pin 1 of terminal P2 and the first drive unit. Pin 2 is grounded to GND. Pin 3 is connected to pin 2 of terminal P1, one end of capacitor C1, and pin 5 of current limiting chip U1. The other end of capacitor C1 is grounded to GND. Pin 1 of terminal P1 is grounded to GND. Pin 1 of current limiting chip U1 is connected to the first drive unit, the second drive unit, and the third drive unit. Pin 3 is grounded to GND through resistor R18. Pin 2 is grounded to GND. Pin 4 is grounded to GND through resistor R36. Pin 5 is connected to one end of capacitor C1.

[0040] Combination Figures 1 to 6 The alarm indicator circuit of this embodiment is used in the following specific way:

[0041] The LED display module consists of red, yellow, and blue LEDs, representing different alarm levels and states. When the power module is powered on, by default, the bases of transistors Q2, Q4, and Q6 are pulled high by the 10kΩ resistors R16, R34, and R52, respectively, turning on transistors Q2, Q4, and Q6. This causes the bases of transistors Q1, Q3, and Q5 to be low, while turning them off. When the system cannot detect a GPIO signal, such as in cases of abnormal pressure, blood leakage, or air alarms (which are usually accompanied by strong audible and visual signals and require immediate response and action from medical personnel), a high-level alarm is triggered. The main control unit inputs a low-level signal with a frequency of 1.4Hz~2.8Hz and a duty cycle of 20%~60% to pin 1 of terminal P2. When the input to pin 1 of terminal P2 is low, the base of transistor Q2 is low, and transistor Q2 is cut off. At the same time, the base of transistor Q1 is high, and transistor Q1 is turned on. Current forms a closed loop flowing through the LED, causing the LED to emit red light. By controlling the frequency and duty cycle, the flashing speed and brightness of the red light can be controlled. When the system detects alarms such as abnormal fluid balance during treatment, deviation of treatment parameters, or consumable replacement reminders, which indicate that hospital personnel need to pay attention and take appropriate measures, but usually do not need to immediately interrupt treatment, a medium-level alarm is triggered. The main control unit inputs a low-level signal with a frequency of 1.4Hz~2.8Hz and a duty cycle of 20%~60% to pin 1 of terminal P2. A low-level signal with a frequency of 0.4Hz to 0.8Hz and a duty cycle of 20% to 60% is input to pin 2 of terminal P2. When pin 2 of terminal P2 is low, the base of transistor Q4 is low and Q4 is cut off. At this time, the base of transistor Q3 is high and Q3 is turned on, and current forms a closed loop flowing through the LED, causing the LED to emit yellow light. The flashing speed and brightness of the yellow light are controlled by controlling the frequency and duty cycle. When the system detects alarms such as preventive maintenance reminders, general system faults, and improper operation prompts, a low-level alarm is triggered. The main control unit inputs a low-level signal to pin 3 of terminal P2. When pin 3 of terminal P2 is low, the base of transistor Q6 is low and Q6 is cut off. At this time, the base of transistor Q5 is high and Q5 is turned on, and current forms a closed loop flowing through the LED, causing the LED to emit continuous blue light.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An alarm indicator circuit, characterized in that, include: Main control unit, drive module, LED display module, and power supply module; The signal output terminal of the main control unit is connected to the signal input terminal of the drive module, and the signal output terminal of the drive module is connected to the signal input terminal of the LED display module. The drive module is used to control the LED display module to emit a specified light color and control the flashing frequency of the LED. The power module is used to supply power to the LED display module; The drive module includes a first drive unit, a second drive unit, and a third drive unit connected in parallel. The LED display module includes a first display module, a second display module, and a third display module respectively connected to the first driving unit, the second driving unit, and the third driving unit; the first display module displays a red alarm light, the second display module displays a yellow alarm light, and the third display module displays a blue alarm light; the first display module includes multiple first light-emitting diodes connected in parallel; The alarm indicator circuit on the PCB board has a gap of 3.2 to 5.2 mm between the central axes of two adjacent first light-emitting diodes.

2. The alarm indicator circuit according to claim 1, characterized in that: The drive module includes a terminal block P2 and an electrostatic discharge and surge protection tube D2; Pin 1 of the terminal P2 is connected to the power module and the first drive unit, pin 2 is connected to pin 1 of the electrostatic discharge and surge protection tube D2 and the second drive unit, pin 3 is connected to pin 3 of the electrostatic discharge and surge protection tube D2 and the third drive unit, and pin 2 of the electrostatic discharge and surge protection tube D2 is grounded to GND. The main control unit is connected to pins 1, 2 and 3 of terminal P2 respectively.

3. The alarm indicator circuit according to claim 2, characterized in that: The first driving unit includes resistors R14, R15, R16, and R17, transistor Q1, and transistor Q2; The base of transistor Q2 is connected to the input terminal of the LED display module through resistor R16. The collector of transistor Q2 is connected to one end of resistor R14 and one end of resistor R15. The other end of resistor R14 is connected between resistor R16 and the LED display module. The other end of circuit R15 is connected to one end of resistor R17 and the base of transistor Q1. The emitter of transistor Q2 is connected to the other end of resistor R17 and then grounded to GND. Pin 1 of the terminal P2 is connected to the base of transistor Q2; The collector of transistor Q1 is connected to the output terminal of the LED display module, and the emitter of transistor Q1 is grounded to GND. The second and third driving units have the same circuit structure as the first driving unit.

4. An alarm indicator circuit according to claim 3, characterized in that: The cathode of each first light-emitting diode is connected in series with a first protection resistor, the anode of each first light-emitting diode is connected to the other end of resistor R14 and resistor R16 respectively, and the other end of each first protection resistor is connected to the collector of transistor Q1 respectively. The second and third display modules have the same circuit structure as the first display module.

5. An alarm indicator circuit according to claim 4, characterized in that: The number of the first light-emitting diode and the first protective resistor is eight or more.

6. An alarm indicator circuit according to claim 2, characterized in that: The power module includes an electrostatic discharge and surge protection tube D1, a current limiting chip U1, a resistor R18, a resistor R36, a capacitor C1, and a terminal block P1. Pin 1 of the electrostatic discharge and surge protection tube D1 is connected between pin 1 of terminal P2 and the first drive unit. Pin 2 is grounded to GND. Pin 3 is connected to pin 2 of terminal P1, one end of capacitor C1 and pin 5 of current limiting chip U1 respectively. The other end of capacitor C1 is grounded to GND. Pin 1 of terminal P1 is grounded to GND. Pin 1 of the current limiting chip U1 is connected to the first driving unit, the second driving unit and the third driving unit respectively. Pin 3 is grounded to GND through resistor R18, pin 2 is grounded to GND and pin 4 is grounded to GND through resistor R36.

Images