Efficient medical oxygen generator driver

Abstract

The utility model discloses a high-efficiency medical oxygen generator driver, which comprises a driving control board, a driving unit is arranged on the driving control board, the driving unit comprises a power supply input module, an MCU processing module, an inversion module and a synchronous motor, the power supply input module is used for supplying power to the MCU processing module, the inversion module and the synchronous motor, and the MCU processing module is used for supplying power to the inversion module and the synchronous motor. A power factor correction module is connected between the power supply input module and the MCU processing module, the MCU processing module is further electrically connected with the synchronous motor through an inversion module, the power factor correction module adopts a single-phase Boost PFC topology circuit to adjust the bus voltage of pulsating direct current to 380V, and when the inversion module outputs, the current phase is aligned with the voltage phase, so that the pulse direct current is output. The power supply input module comprises a power supply input interface and an EMI filtering and rectifying module which are connected in sequence. The structure improves the utilization rate of electric energy.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oxygen generator drive system, concretely is a kind of efficient medical oxygen generator driver. BACKGROUND

[0002] Molecular sieve oxygen production refers to the method for separating and producing oxygen from air at normal temperature by using the adsorption characteristics of molecular sieve. This method generally adopts pressure swing adsorption separation technology (PSA).

[0003] Specifically, the working principle of molecular sieve oxygen production is to compress air through a compression system, then cool it through a cooling system, and then remove impurities through a filtering system. The treated compressed air enters an adsorption tower containing molecular sieve, and nitrogen, carbon dioxide and other gases in the air are adsorbed by the molecular sieve, and the gas flowing out is high-purity oxygen. When the adsorption tower reaches a certain saturation degree, it will be washed and desorbed for regeneration, thus completing a cycle period and realizing continuous gas supply. This oxygen production method has the characteristics of fast oxygen production speed, safety, economy and convenience, and the oxygen concentration produced is usually between 90% and 96%.

[0004] Currently, the air compressor in the oxygen generator is mostly a single-phase motor. The single-phase motor has large torque ripple, uneven air output and low efficiency, and cannot effectively provide sufficient oxygen in urgent oxygen production occasions. The single-phase motor is generally directly connected to the power supply for use, and when used in EMI sensitive occasions (hospitals), it is easy to cause interference to the power supply of other medical equipment, and in some cases, it may cause the heart pacemaker to stop running. When the single-phase motor operates, mechanical impact caused by large torque ripple forms large running noise, and it cannot be applied in noise-sensitive occasions. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of efficient medical oxygen generator driver to solve the problems of unstable oxygen production, excessive noise and EMI interference to other devices caused by harmonic current when directly connected to the power supply for use in the single-phase motor of the existing oxygen generator driver in the above background technology due to torque ripple.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: an efficient medical oxygen generator driver, including drive control panel, drive unit is arranged on the drive control panel, drive unit includes power input module, MCU processing module, inverter module and synchronous motor, power input module is used for power supply for MCU processing module, inverter module and synchronous motor, power input module is connected with power factor correction module between MCU processing module, MCU processing module still passes through inverter module and synchronous motor electric connection, power factor correction module adopts single -phase Boost PFC topology circuit and realizes the pulse direct current bus voltage regulation to 380V, simultaneously when inverter module output, realizes the current phase alignment voltage phase, thereby improves active power, power input module includes power input interface, EMI filter rectifier module connected in proper order, power input module passes through EMI filter rectifier module and is connected with power factor correction module, inverter module adopts the intelligent power module (IPM) of internal integrated logic, control, detection and protection circuit.

[0007] As preferred, the EMI filter rectifier module includes the following units connected in proper order:

[0008] The slow fuse is matched with the pressure sensitive resistor to limit the surge voltage and prevent the surge protection unit from breaking down the subsequent circuit.

[0009] For common mode noise, the amorphous common mode inductor is used for interception, and the Y type capacitor is used for guiding the ground, and the X capacitor and the leakage inductance in the common mode inductor are used for eliminating the differential mode noise.

[0010] Finally, the full-bridge rectification of the pulse direct current like steamed buns is obtained.

[0011] As preferred, the MCU processing module is further connected with the PWM pulse speed regulation circuit and the LED state indicating lamp circuit.

[0012] As preferred, the MCU processing module is further connected with the RS485 serial communication circuit, the display interface and the program download interface.

[0013] As preferred, the MCU processing module is further connected with the V-phase current acquisition module for acquiring the V-phase current of the synchronous motor, the U-phase current acquisition module for acquiring the U-phase current of the synchronous motor and the voltage reference circuit.

[0014] As preferred, the power input module further includes the LDO voltage stabilizing circuit and the direct current DC-DC inverter circuit.

[0015] As preferred, the bottom of the drive control board is provided with a heat dissipation plate, and the bottom of the heat dissipation plate is provided with one or more heat dissipation fins extending downward.

[0016] As preferred, the heat dissipation plate and the drive control board are fixed by a plurality of screws.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] Energy saving: under the condition of AV220V power supply, when the rated output is 550W, the power factor is as high as 99.6%, and the power utilization rate can be greatly improved.

[0019] High efficiency and stability: high torque + low torque pulsation (achieved by inverter module 203), ensuring smooth and smooth compression air process, uniform air outlet, stable pressure, and fast reaching the required oxygen pressure.

[0020] Small installation volume: with advanced control technology, high integration and high power density, the performance is greatly improved, and the installation volume is greatly reduced, which is more convenient for installation and maintenance.

[0021] Low noise: the carrier of the motor control is 16K, which is difficult for human ears to detect, and the torque pulsation is low, so that the noise generated during the operation of the whole machine is lower than 60dB, and it is suitable for noise sensitive occasions. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure diagram of a high-efficiency medical oxygen generator drive in embodiment 1.

[0023] Figure 2 It is a circuit principle block diagram of a drive unit in a high-efficiency medical oxygen generator drive in embodiment 1.

[0024] Figure 3 It is a principle block diagram of a power input module in embodiment 1.

[0025] Figure 4 It is a circuit principle diagram of a power input module, an LDO voltage stabilizing circuit and a direct current DC-DC inverter circuit in embodiment 1.

[0026] Figure 5 It is a circuit principle block diagram of an MCU processing module, a display interface and a program download interface in embodiment 1.

[0027] Figure 6 It is a circuit principle diagram of an inverter module, a V-phase current collection module, a U-phase current collection module and a voltage reference circuit.

[0028] Figure 7The circuit principle diagram of the RS485 serial communication circuit, the PWM pulse speed regulation circuit and the LED state indicating lamp circuit.

[0029] In the figure: drive control board 1, drive unit 2, power input module 201, power input interface 2011, EMI filter rectifier module 2012, surge protection unit 2013, filter unit module 2014, full-bridge rectifier 2015, MCU processing module 202, inverter module 203, synchronous motor 204, power factor correction module 3, PWM pulse speed regulation circuit 4, LED state indicating lamp circuit 5, RS485 serial communication circuit 6, display interface 7, program download interface 8, LDO voltage stabilizing circuit 9, direct current DC-DC inverter circuit 10, heat sink 11, cooling fin 12, screw 13, V-phase current collection module 14, U-phase current collection module 15, voltage reference circuit 16. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and all other embodiments obtained by those skilled in the art based on the embodiments in the utility model without creative labor belong to the scope of protection of the utility model.

[0031] In addition, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly and specifically limited.

[0032] Embodiment 1

[0033] Please refer to Figures 1-7The utility model provides an embodiment: a kind of efficient medical oxygen generator driver, including drive control panel 1, drive unit 2 is provided on the drive control panel 1, the drive unit 2 includes power input module 201, MCU processing module 202, inverter module 203 and synchronous motor 204, the power input module 201 is used to power supply MCU processing module 202, inverter module 203 and synchronous motor 204, power factor correction module 3 is connected between the power input module 201 and MCU processing module 202, the MCU processing module 202 is also electrically connected by inverter module 203 with synchronous motor 204, power factor correction module 3 adopts single-phase Boost PFC topology circuit to realize that the bus voltage of pulsating direct current is regulated to 380V, simultaneously when inverter module 203 output, realize that current phase is aligned voltage phase, to improve active power, the power input module 201 includes power input interface 2011, EMI filter rectifier module 2012 connected in sequence, the power input module 201 is connected with power factor correction module 3 by EMI filter rectifier module 2012, inverter module 203 adopts intelligent power module (IPM) that logic, control, detection and protection circuit are integrated in its interior, the power input module 201 also includes LDO voltage stabilizing circuit 9 and direct current DC-DC inverter circuit 10.

[0034] As preferred, the EMI filter rectifier module 2012 includes the following units connected in sequence:

[0035] Use slow fuse safety fuse to match piezoresistance, limit surge voltage, prevent the surge protection unit 2013 of breaking down after stage circuit;

[0036] For common mode disturbance, use amorphous common mode inductance to intercept, part of amorphous common mode inductance cannot intercept, Y type capacitor is used to guide ground simultaneously, and X capacitor is used to eliminate differential mode disturbance with leakage inductance in common mode inductor Filter unit module 2014;

[0037] Finally get steamed bun wave like pulsating direct current full-bridge rectification 2015.

[0038] As preferred, when motor winding temperature reaches 120 DEG C, MCU processing module 202 gives stop signal, when motor temperature is lower than 80 DEG C, MCU processing module 202 restarts motor to continue running.

[0039] As preferred, the MCU processing module 202 is further connected with a PWM pulse speed regulation circuit 4 and an LED state indicator lamp circuit 5, the LED state indicator lamp circuit 5 is arranged to display the working state of the motor, and the PWM pulse speed regulation circuit 4 is arranged to pulse regulate the motor, thereby further improving the working efficiency and service life of the motor.

[0040] As preferred, the MCU processing module 202 is further connected with an RS485 serial communication circuit 6, a display interface 7 and a program download interface 8, in the embodiment, the program download interface 8 is arranged to facilitate the automatic program download of the controller in the later period, the display interface 7 is arranged to facilitate the connection of the display screen in the later period, and the RS485 serial communication circuit 6 is arranged to realize the communication connection with other devices in the later period.

[0041] As preferred, the MCU processing module 202 is further connected with a V-phase current acquisition module 14 for acquiring the V-phase current of the synchronous motor 204, a U-phase current acquisition module 15 for acquiring the U-phase current of the synchronous motor 204 and a voltage reference circuit 16.

[0042] As preferred, the bottom of the drive control board 1 is provided with a heat sink 11, the bottom of the heat sink 11 is provided with one or more heat dissipation fins 12 extending downward, and the heat sink 11 and the drive control board 1 are fixed through a plurality of screws 13, in the embodiment, the heat dissipation fins 12 are arranged to further improve the heat dissipation effect of the drive control board 1.

[0043] In the structure, the MCU processing module 202 is an industrial-grade electric drive special MCU, which has an ECCU drive interface, can more conveniently drive the inverter module, and provides an effective solution strategy for high-performance FOC control, in addition, the MCU is responsible for bus voltage sampling, temperature sampling, motor current sampling and the like, and provides effective protection for the stable operation of the synchronous motor;

[0044] The inverter module 203 uses an intelligent power module (IPM), which integrates logic, control, detection and protection circuits inside, is convenient to use, reduces the size and development time of the system, and greatly enhances the reliability of the system;

[0045] The excitation magnetic field of the synchronous motor 204 is provided by a permanent magnet, and the rotor does not need excitation current, thereby improving the efficiency of the motor, in addition, the motor can be designed as a multi-pole motor, and the torque pulsation is more stable when the air is compressed; in order to prevent the motor from overheating and demagnetizing when working under high pressure for a long time, a thermal probe is installed in the motor, when the temperature of the motor winding reaches 120℃, the MCU gives a stop signal, and when the temperature of the motor is lower than 80℃, the motor continues to run.

[0046] The effect of the structure is as follows:

[0047] Energy saving: under the condition of AV220V power supply, the power factor is as high as 99.6% when the rated output is 550W, which can greatly improve the utilization rate of electric energy;

[0048] High efficiency and stability: high torque + low torque ripple (achieved by inverter module 203), ensuring smooth and smooth compression air process, uniform air outlet, stable pressure, and fast reaching the required oxygen pressure;

[0049] Small installation volume: with advanced control technology, high integration and high power density, the performance is greatly improved, and the installation volume is greatly reduced, which is more convenient for installation and maintenance;

[0050] Low noise: the carrier controlled by the motor is 16K, which is difficult for human ears to detect, and the torque ripple is low, the noise generated during the operation of the whole machine is lower than 60dB, which is suitable for noise sensitive occasions. The structure is mainly applied to three-phase synchronous oxygen compressor drive, including FOC, PFC, RS485, etc.

[0051] 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 recorded in the foregoing embodiments or make equivalent replacement for part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A high-efficiency medical oxygen generator driver, comprising a drive control board (1), characterized in that: The drive control board (1) is provided with a drive unit (2), the drive unit (2) includes a power input module (201), an MCU processing module (202), an inverter module (203) and a synchronous motor (204), the power input module (201) is used for power supply for the MCU processing module (202), the inverter module (203) and the synchronous motor (204), a power factor correction module (3) is connected between the power input module (201) and the MCU processing module (202), the MCU processing module (202) is also electrically connected with the synchronous motor (204) through the inverter module (203), the power factor correction module (3) is realized by single-phase Boost PFC topology circuit, the pulsed DC bus voltage is regulated to 380V, and when the inverter module (203) outputs, the current phase is aligned with the voltage phase, so that the active power is improved, the power input module (201) includes a power input interface (2011) and an EMI filter rectifier module (2012) connected in sequence, the power input module (201) is connected with the power factor correction module (3) through the EMI filter rectifier module (2012), and the inverter module (203) adopts an intelligent power module (IPM) with integrated logic, control, detection and protection circuit.

2. The high-efficiency medical oxygen generator driver of claim 1, wherein: The EMI filter rectifier module (2012) includes the following units connected in sequence: A surge protection unit (2013) using a slow melting fuse matched with a pressure sensitive resistor limits the surge voltage and prevents breakdown of the subsequent circuit; A filter unit module (2014) using an amorphous common mode inductor intercepts common mode noise, and uses Y type capacitor to guide the ground, and uses X capacitor and leakage inductance in the common mode inductor to eliminate differential mode noise; Finally, a full-bridge rectifier (2015) of pulsed DC with steamed bun wave is obtained.

3. The high-efficiency medical oxygen generator driver of claim 1, wherein: The MCU processing module (202) is also connected with a PWM pulse speed regulation circuit (4) and an LED state indicating lamp circuit (5).

4. The high-efficiency medical oxygen generator driver of claim 2, wherein: The MCU processing module (202) is also connected with an RS485 serial communication circuit (6), a display interface (7) and a program download interface (8).

5. The high-efficiency medical oxygen generator drive of claim 1 or 2 or 3 or 4, characterized in that: The MCU processing module (202) is also connected with a V-phase current acquisition module (14) for acquiring V-phase current of the synchronous motor (204), a U-phase current acquisition module (15) for acquiring U-phase current of the synchronous motor (204) and a voltage reference circuit (16).

6. The high-efficiency medical oxygen generator drive of claim 1, wherein: The power input module (201) further includes an LDO voltage stabilizing circuit (9) and a direct current DC-DC inverter circuit (10).

7. The high-efficiency medical oxygen generator drive of claim 1 or 2 or 3 or 4, characterized in that: The bottom of the drive control board (1) is provided with a heat sink (11), and the bottom of the heat sink (11) is provided with one or more heat dissipation fins (12) extending downward.

8. The high-efficiency medical oxygen generator drive of claim 7, wherein: The heat sink (11) and the drive control board (1) are fixed by a plurality of screws (13).

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