An oxygen generator abnormal working alarm method and alarm system

Abstract

The present invention discloses an alarm system, comprising a control unit, a power grid voltage detection unit and a power supply current detection unit electrically connected to an input end of the control unit, and also comprising a driving unit for controlling whether the power supply current detection unit is working; and also comprising an oxygen concentrator working abnormality alarm method. Compared with the prior art, the present invention has the following beneficial effects: the present invention has a simple structure, and the present invention adds an input power supply voltage detection circuit, which can detect whether the power grid is abnormal in time, and prompt the user to prepare oxygen cylinders in advance for backup, and can distinguish whether the working current is abnormal due to the compressor or the power grid, and more accurately guide the user on how to deal with a fault when the machine is used.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and in particular to an alarm system and an oxygen concentrator operation abnormality alarm method. Background Art

[0002] At present, the application of small molecular sieve oxygen concentrators is very extensive, and they are mainly sold for home and medical use. Due to the special nature of hospitals, municipal power supply will be given priority, and hospitals will also have backup generators to prevent sudden power outages. However, ordinary household users do not have such countermeasures. Some users of small molecular sieve oxygen concentrators will buy one and use it at home. In some remote areas, the power grid is unstable, and users cannot get early warning. They may not realize it until the power outage occurs, which will greatly affect the treatment of customers. Therefore, it is very important to obtain an alarm system and an abnormal alarm method for oxygen concentrators to solve the problem of oxygen concentrators being unusable due to power outages. Summary of the invention

[0003] To solve the above technical problems, on the one hand, the present invention provides an alarm system, including a control unit, a grid voltage detection unit and a power supply current detection unit electrically connected to the input end of the control unit, and also including a drive unit for controlling whether the power supply current detection unit is working.

[0004] The grid voltage detection unit includes a first voltage transformer, the two ends of the primary coil of the first voltage transformer are respectively connected to the live wire and the neutral wire of the grid, the secondary coil of the first voltage transformer is connected to the input end of the control unit, the primary side of the first voltage transformer generates an AC voltage division, and the secondary coil induces a voltage of the same magnitude. It also includes a seventh resistor connected in parallel to the two ends of the secondary side of the first voltage transformer, the seventh resistor is connected in parallel with a twelfth capacitor, the secondary side of the first voltage transformer is also connected to a first clamping diode, and the first voltage transformer is connected to the input end of the control unit through a fifth resistor.

[0005] The secondary coil induces a voltage of the same magnitude, thereby forming an AC voltage divider on the resistor R7. The first clamping diode is used to protect the IO port of the control unit from being damaged by high-voltage spikes. The fifth resistor and the thirteenth capacitor form an RC filter circuit. The twelfth capacitor is used to filter out high-frequency interference signals and finally output a voltage signal to the control unit.

[0006] The power supply current detection unit includes a second voltage transformer, the two ends of the primary coil of the second voltage transformer are respectively connected to the live wire of the power grid and the positive electrode of the oxygen concentrator, the negative electrode of the oxygen concentrator is connected to the neutral line of the power grid, and the secondary coil of the second voltage transformer is connected to the input end of the control unit. It also includes an eleventh resistor connected in parallel to the two ends of the secondary side of the second voltage transformer, the eleventh resistor is connected in parallel with the sixteenth capacitor, the secondary side of the second voltage transformer is also connected to a second clamping diode, and the second voltage transformer is connected to the input end of the control unit through the tenth resistor. The ratio of the number of primary coils and secondary coils of the second voltage transformer is 1:2000.

[0007] The primary side of the second voltage transformer is connected in series to the main circuit of the power supply. A current I will pass through the primary coil. The turns ratio of the primary coil to the secondary coil is 1:2000. The secondary coil will induce a current of I / 2000, and an AC voltage signal of 100*I / 2000 will be generated on the eleventh resistor. The second clamping diode is to protect the IO port of the control unit from being damaged by high-voltage spikes. The tenth resistor and the seventeenth capacitor form an RC filter circuit. The sixteenth capacitor is to filter out high-frequency interference signals and finally output the current signal to the control unit.

[0008] The driving unit includes a relay connected between the positive electrode of the oxygen concentrator and the primary coil of the second voltage transformer, and also includes a driving chip, the input end of the driving chip is connected to the output end of the control unit, and the output end of the driving chip is connected to the relay. When the relay needs to be controlled to close, the control unit will output a high-level signal to the seventh pin of the driving chip, and the seventh pin of the driving chip will output a low-level signal, at which time the relay is turned on and the contacts are closed.

[0009] It also includes a liquid crystal screen communication circuit, including a connecting chip and a display screen, wherein the connecting chip is connected to a control unit for converting level signals, and the connecting chip is connected to the display screen. The third capacitor, the fourth capacitor, the seventh capacitor and the eleventh capacitor electrically connected to the connecting chip are used for energy storage and filtering high-frequency noise at the same time, the eleventh pin and the twelfth pin of the connecting chip are respectively connected to the control unit, wherein the first resistor and the first capacitor, the second resistor and the second capacitor, the third resistor and the fifth capacitor, the fourth resistor and the sixth capacitor respectively form an RC filter circuit, the eighth capacitor and the ninth capacitor are used for power supply filtering, the connecting chip model is MAX3232, and the input signal and output signal of the control unit can be converted from TTL level to 232 level signal, and the connecting chip is connected to the display screen to realize communication with the display screen.

[0010] The control unit includes a single-chip minimum system STM32F103VCT6 and its external auxiliary circuits. The twelfth resistor, the first crystal oscillator, the eighteenth capacitor and the nineteenth capacitor constitute a crystal oscillator circuit for providing an external clock source to the control unit.

[0011] On the other hand, the present invention provides an abnormal working alarm method for an oxygen concentrator, wherein a control unit reads voltage signals and current signals of a grid voltage detection unit and a power supply current detection unit, and the control unit converts the above voltage signals and current signals into actual voltage and actual current currently input to the whole machine, and the control unit collects a set of actual voltage and actual current every 10 seconds.

[0012] When the grid voltage fluctuates, the actual voltage increases abnormally. When the control unit detects multiple abnormal actual voltages, it outputs an alarm signal and then prompts the user to prepare oxygen cylinders in advance as backup on the display screen. At the same time, the control unit determines whether to alarm based on whether the current actual voltage is abnormal, that is, the control unit detects whether the fluctuation of the voltage signal is within ±10%. When the control unit detects that the voltage signal continues to fluctuate by more than ±10%, it alarms. When the control unit detects that the working current exceeds 1.2 times the rated current of the compressor in the oxygen concentrator, if the grid voltage is also abnormally high at this time, the alarm prompts that the grid is unstable, and the user is prompted to prepare oxygen cylinders in advance as backup. If the grid voltage is normal at this time and the current of the compressor is abnormally high, the control unit prompts that the compressor is working abnormally, and the user is prompted to prepare oxygen cylinders in advance as backup and contact the after-sales supplier as soon as possible.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a simple structure, the addition of an alarm system, the ability to detect grid stability, the voltage and current of the input grid on the oxygen concentrator, and early warning to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a circuit diagram of a control unit of the present invention;

[0015] Figure 2 The circuit diagram of the grid voltage detection unit, the power supply voltage detection unit and the driving unit of the present invention;

[0016] Figure 3 It is a circuit diagram of the LCD communication circuit; DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of the protection claimed in the present invention, the present invention is described in detail with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific implementations of the present invention, which are only some embodiments of the present invention, wherein the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention.

[0018] Referring to the accompanying drawings, on the one hand, the present invention adopts the following technical solution, an alarm system, including a control unit, a grid voltage detection unit and a power supply current detection unit electrically connected to the input end of the control unit, and also including a drive unit for controlling whether the power supply current detection unit is working.

[0019] The grid voltage detection unit includes a first voltage transformer, the two ends of the primary coil of the first voltage transformer are respectively connected to the live wire and the neutral wire of the grid, the secondary coil of the first voltage transformer is connected to the input end of the control unit, the primary side of the first voltage transformer generates an AC voltage division, and the secondary coil induces a voltage of the same magnitude. It also includes a seventh resistor connected in parallel to the two ends of the secondary side of the first voltage transformer, the seventh resistor is connected in parallel with a twelfth capacitor, the secondary side of the first voltage transformer is also connected to a first clamping diode, and the first voltage transformer is connected to the input end of the control unit through a fifth resistor.

[0020] The secondary coil induces a voltage of the same magnitude, thereby forming an AC voltage divider on the resistor R7. The first clamping diode is used to protect the IO port of the control unit from being damaged by high-voltage spikes. The fifth resistor and the thirteenth capacitor form an RC filter circuit. The twelfth capacitor is used to filter out high-frequency interference signals and finally output a voltage signal to the control unit.

[0021] The power supply current detection unit includes a second voltage transformer, the two ends of the primary coil of the second voltage transformer are respectively connected to the live wire of the power grid and the positive electrode of the oxygen concentrator, the negative electrode of the oxygen concentrator is connected to the neutral line of the power grid, and the secondary coil of the second voltage transformer is connected to the input end of the control unit. It also includes an eleventh resistor connected in parallel to the two ends of the secondary side of the second voltage transformer, the eleventh resistor is connected in parallel with the sixteenth capacitor, the secondary side of the second voltage transformer is also connected to a second clamping diode, and the second voltage transformer is connected to the input end of the control unit through the tenth resistor. The ratio of the number of primary coils and secondary coils of the second voltage transformer is 1:2000.

[0022] The primary side of the second voltage transformer is connected in series to the main circuit of the power supply. A current I will pass through the primary coil. The turns ratio of the primary coil to the secondary coil is 1:2000. The secondary coil will induce a current of I / 2000, and an AC voltage signal of 100*I / 2000 will be generated on the eleventh resistor. The second clamping diode is to protect the IO port of the control unit from being damaged by high-voltage spikes. The tenth resistor and the seventeenth capacitor form an RC filter circuit. The sixteenth capacitor is to filter out high-frequency interference signals and finally output the current signal to the control unit.

[0023] The driving unit includes a relay connected between the positive electrode of the oxygen concentrator and the primary coil of the second voltage transformer, and also includes a driving chip, the input end of the driving chip is connected to the output end of the control unit, and the output end of the driving chip is connected to the relay. When the relay needs to be controlled to close, the control unit will output a high-level signal to the seventh pin of the driving chip, and the seventh pin of the driving chip will output a low-level signal, at which time the relay is turned on and the contacts are closed.

[0024] It also includes a liquid crystal screen communication circuit, including a connecting chip and a display screen, wherein the connecting chip is connected to a control unit for converting level signals, and the connecting chip is connected to the display screen. The third capacitor, the fourth capacitor, the seventh capacitor and the eleventh capacitor electrically connected to the connecting chip are used for energy storage and filtering high-frequency noise at the same time, the eleventh pin and the twelfth pin of the connecting chip are respectively connected to the control unit, wherein the first resistor and the first capacitor, the second resistor and the second capacitor, the third resistor and the fifth capacitor, the fourth resistor and the sixth capacitor respectively form an RC filter circuit, the eighth capacitor and the ninth capacitor are used for power supply filtering, the connecting chip model is MAX3232, and the input signal and output signal of the control unit can be converted from TTL level to 232 level signal, and the connecting chip is connected to the display screen to realize communication with the display screen.

[0025] The control unit includes a single-chip minimum system STM32F103VCT6 and its external auxiliary circuits. The twelfth resistor, the first crystal oscillator, the eighteenth capacitor and the nineteenth capacitor constitute a crystal oscillator circuit for providing an external clock source to the control unit.

[0026] On the other hand, the present invention provides an abnormal working alarm method for an oxygen concentrator, wherein a control unit reads voltage signals and current signals of a grid voltage detection unit and a power supply current detection unit, and the control unit converts the above voltage signals and current signals into actual voltage and actual current currently input to the whole machine, and the control unit collects a set of actual voltage and actual current every 10 seconds.

[0027] When the grid voltage fluctuates, the actual voltage increases abnormally. When the control unit detects multiple abnormal actual voltages, it outputs an alarm signal and then prompts the user to prepare oxygen cylinders in advance as backup on the display screen. At the same time, the control unit determines whether to alarm based on whether the current actual voltage is abnormal, that is, the control unit detects whether the fluctuation of the voltage signal is within ±10%. When the control unit detects that the voltage signal continues to fluctuate by more than ±10%, it alarms. When the control unit detects that the working current exceeds 1.2 times the rated current of the compressor in the oxygen concentrator, if the grid voltage is also abnormally high at this time, the alarm prompts that the grid is unstable, and the user is prompted to prepare oxygen cylinders in advance as backup. If the grid voltage is normal at this time and the current of the compressor is abnormally high, the control unit prompts that the compressor is working abnormally, and the user is prompted to prepare oxygen cylinders in advance as backup and contact the after-sales supplier as soon as possible.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has a simple structure, and the addition of an alarm system can detect the stability of the power grid, detect the voltage and current of the input power grid on the oxygen concentrator, and warn the user in advance. The present invention adds an input power supply voltage detection circuit, which can detect whether the power grid is abnormal in time, prompt the user to prepare oxygen cylinders in advance as a backup, and can distinguish whether the abnormal working current is caused by the compressor or the power grid, and more accurately guide the user on how to deal with the machine when it encounters a fault.

[0029] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An oxygen concentrator abnormality alarm method, characterized in that: The method comprises the following steps: a control unit reads the voltage signal and the current signal of the grid voltage detection unit and the power supply current detection unit, and the control unit converts the voltage signal and the current signal into the actual voltage and the actual current currently inputted by the whole machine. When the grid voltage fluctuates, the actual voltage increases abnormally. When the control unit detects multiple abnormal actual voltages, it outputs an alarm signal, and then prompts the user to prepare oxygen cylinders in advance as a backup on the display screen; At the same time, the control unit determines whether to alarm based on whether the current actual voltage is abnormal, that is, the control unit detects whether the fluctuation of the voltage signal is within ±X%, and alarms when the control unit detects that the voltage signal continues to fluctuate by more than ±X%; when the control unit detects that the working current exceeds Y times the rated current of the compressor in the oxygen concentrator, if the grid voltage is also abnormally high at this time, the alarm prompts that the grid is unstable, and prompts the user to prepare oxygen cylinders in advance as a backup; if the grid voltage is normal at this time, and the current of the compressor is abnormally high, the control unit prompts that the compressor is working abnormally, and prompts the user to prepare oxygen cylinders in advance as a backup, and contact the after-sales supplier as soon as possible; It includes a control unit, a grid voltage detection unit and a power supply current detection unit electrically connected to an input end of the control unit, and also includes a driving unit for controlling whether the power supply current detection unit works; The grid voltage detection unit includes a first voltage transformer, and also includes a seventh resistor connected in parallel to both ends of the secondary side of the first voltage transformer, the seventh resistor is connected in parallel to a twelfth capacitor, the secondary side of the first voltage transformer is also connected to a first clamping diode, and the first voltage transformer is connected to the input end of the control unit through a fifth resistor; The two ends of the primary coil of the first voltage transformer are respectively connected to the live wire and the neutral wire of the power grid, and the secondary coil of the first voltage transformer is connected to the input end of the control unit. The primary side of the first voltage transformer generates an AC voltage division, and the secondary coil induces a voltage of the same magnitude; The power supply current detection unit includes a second voltage transformer, two ends of the primary coil of the second voltage transformer are respectively connected to the live wire of the power grid and the positive electrode of the oxygen generator, the negative electrode of the oxygen generator is connected to the neutral wire of the power grid, and the secondary coil of the second voltage transformer is connected to the input end of the control unit; It also includes an eleventh resistor connected in parallel to both ends of the secondary side of the second voltage transformer, the eleventh resistor is connected in parallel with a sixteenth capacitor, the secondary side of the second voltage transformer is also connected to a second clamping diode, and the second voltage transformer is connected to the input end of the control unit through the tenth resistor; The driving unit includes a relay connected between the positive pole of the oxygen generator and the primary coil of the second voltage transformer, and also includes a driving chip, the input end of the driving chip is connected to the output end of the control unit, and the output end of the driving chip is connected to the relay.

2. The oxygen concentrator abnormal operation alarm method according to claim 1, characterized in that: The control unit collects a set of actual voltage and actual current every 10 seconds; the X value is 10 and the Y value is 1.

2.

3. The oxygen concentrator abnormal operation alarm method according to claim 1, characterized in that: The ratio of the number of turns of the primary coil to the secondary coil of the second voltage transformer is 1:2000.

4. The oxygen concentrator abnormal operation alarm method according to claim 1, characterized in that: It also includes a liquid crystal screen communication circuit, including a connecting chip and a display screen, wherein the connecting chip is connected to the control unit for converting level signals, and the connecting chip is connected to the display screen.

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