An electric clothes drying machine drive integrated system and its resistance control method

Abstract

The present invention discloses an electric clothes drying machine drive integrated system and its resistance control method, the drive integrated system includes an AC conversion power supply unit, a control unit MCU, a brushless drive unit MCU, a driving circuit, a power amplifier circuit, a current detection circuit, an operational amplifier circuit, a DC brushless motor and a rope reel, the present invention uses a current detection circuit to monitor the working current of the DC brushless motor in real time, when the working current suddenly decreases or increases to reach a set value, the DC brushless motor is controlled to stop and reverse, when the upward resistance is encountered, it can avoid excessive force on the wire rope on the rope reel, and when the downward resistance is encountered, it can avoid the wire rope disorder and cause failure. Compared with the conventional mechanical structure, there is no mechanical failure, the assembly requirements are low, and it can be realized by adding a current detection circuit, which reduces the cost.

Description

Technical Field

[0001] The invention relates to an electric clothes drying machine drive integrated system and an obstacle control method thereof. Background Art

[0002] Currently, the clothes drying machines on the market all stop (protect) when encountering downward obstacles through a set of mechanical structures, including: switch seat, switch, swing arm, shaft mounting bracket, guide wheel, reset spring, etc. This structure has the following defects: 1. It cannot stop for protection when encountering upward obstacles to prevent the wire rope from being subjected to excessive tension and affecting its lifespan; 2. The structure is complex, with high production requirements and a high probability of failure. Summary of the invention

[0003] In response to the above problems, the present invention provides an electric clothes drying machine drive integrated system and a method for controlling the same when encountering resistance. The current of the motor is monitored by a current monitoring module, and the motor is controlled according to the sudden change of the current when encountering resistance, thereby effectively solving the problems pointed out in the background technology.

[0004] The technical solution adopted by the present invention is:

[0005] An electric clothes drying machine drive integrated system comprises an AC conversion power supply unit, a control unit MCU, a brushless drive unit MCU, a driving circuit, a power amplifier circuit, a current detection circuit, an operational amplifier circuit, a DC brushless motor and a rope winder. The control unit MCU, the brushless drive unit MCU, the driving circuit and the power amplifier circuit are all electrically connected to the AC conversion power supply unit. The control unit MCU is electrically connected to the DC brushless motor via the driving circuit and the power amplifier circuit in turn. The power amplifier circuit is electrically connected to the control unit MCU via the current detection circuit and the operational amplifier circuit in turn. The DC brushless motor is connected to the rope winder.

[0006] Preferably, the AC conversion power supply unit includes a DC36V switching power supply circuit and a DC12V switching power supply circuit, the DC36V switching power supply circuit is electrically connected to the DC15V power supply circuit and the DC5V power supply circuit in sequence, the DC12V switching power supply circuit is electrically connected to the DC5V power supply circuit and the DC3.3V power supply circuit in sequence, the DC3.3V power supply circuit is electrically connected to the control unit MCU, the DC5V power supply circuit electrically connected to the DC15V power supply circuit is electrically connected to the brushless drive unit MCU, the DC15V power supply circuit is electrically connected to the driving circuit, and the DC36V switching power supply circuit is electrically connected to the power amplifier circuit.

[0007] Preferably, it further comprises an external output amplifier circuit, and the external output amplifier circuit is electrically connected to the lighting module, the disinfection module, the drying module and the air-drying module.

[0008] Preferably, it further comprises a remote controller and a buzzer, wherein the remote controller is electrically connected to the control unit MCU via a remote controller receiving circuit, and the buzzer is electrically connected to the control unit MCU.

[0009] Preferably, the brushless DC motor is electrically connected to the brushless drive unit MCU via a speed detection circuit and a position detection circuit.

[0010] At the same time, the present invention also provides an obstacle control method for an electric clothes drying machine drive integrated system, comprising the following steps:

[0011] 1) When the electric clothes dryer is in the process of descending, if the current detection circuit detects that the working current of the brushless DC motor suddenly decreases and exceeds the set value a, the brushless drive unit MCU performs the following control according to the position of the rope reel connected to the brushless DC motor detected by the position detection circuit:

[0012] a) When the rope reel is opened more than or equal to 3 / 4 turns, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse 3 / 4 turns;

[0013] b) When the rope reel is opened less than 3 / 4 of a turn, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse until the rope reel is tightened;

[0014] 2) When the electric clothes dryer is in the upward process, if the current detection circuit detects that the working current of the brushless DC motor suddenly increases and exceeds the set value a, the brushless drive unit MCU performs the following control according to the position of the rope reel connected to the brushless DC motor detected by the position detection circuit:

[0015] a) When the rope reel is less than 3 / 4 of a turn from being fully opened, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse until the rope reel is fully opened;

[0016] b) When the rope reel is opened more than or equal to 3 / 4 turn, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse the rope reel 3 / 4 turn.

[0017] Preferably, the set value a is 8%.

[0018] The present invention adopts a current detection circuit to monitor the working current of the DC brushless motor in real time. When the working current suddenly decreases or increases to reach a set value, the DC brushless motor is controlled to stop and reverse. When encountering an upward obstacle, it can avoid excessive stress on the wire rope on the rope winder. When encountering a downward obstacle, it can avoid malfunctions caused by disorder of the wire rope. Compared with conventional mechanical structures, there is no mechanical failure, and the assembly requirements are low. It can be achieved by adding a current detection circuit, which reduces the cost.

[0019] The present invention adopts an operational amplifier circuit to amplify the current detected by the current detection circuit, thereby improving the monitoring accuracy and the accuracy of the resistance control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the system principle of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. Example

[0022] An electric clothes drying machine drive integrated system comprises an AC conversion power supply unit, a control unit MCU, a brushless drive unit MCU, a driving circuit, a power amplifier circuit, a current detection circuit, an operational amplifier circuit, a DC brushless motor and a rope winder. The control unit MCU, the brushless drive unit MCU, the driving circuit and the power amplifier circuit are all electrically connected to the AC conversion power supply unit. The control unit MCU is electrically connected to the DC brushless motor via the driving circuit and the power amplifier circuit in turn. The power amplifier circuit is electrically connected to the control unit MCU via the current detection circuit and the operational amplifier circuit in turn. The DC brushless motor is connected to the rope winder.

[0023] The AC conversion power supply unit includes a DC36V switching power supply circuit and a DC12V switching power supply circuit. The DC36V switching power supply circuit is electrically connected to the DC15V power supply circuit and the DC5V power supply circuit in sequence. The DC12V switching power supply circuit is electrically connected to the DC5V power supply circuit and the DC3.3V power supply circuit in sequence. The DC3.3V power supply circuit is electrically connected to the control unit MCU. The DC5V power supply circuit electrically connected to the DC15V power supply circuit is electrically connected to the brushless drive unit MCU. The DC15V power supply circuit is electrically connected to the driving circuit. The DC36V switching power supply circuit is electrically connected to the power amplifier circuit.

[0024] It also includes an external output amplifier circuit, which is electrically connected to the lighting module, the disinfection module, the drying module and the air-drying module.

[0025] It also includes a remote controller and a buzzer. The remote controller is electrically connected to the control unit MCU via a remote controller receiving circuit, and the buzzer is electrically connected to the control unit MCU.

[0026] The brushless DC motor is electrically connected to the brushless drive unit MCU via a speed detection circuit and a position detection circuit.

[0027] The present invention also provides an obstacle control method for an electric clothes drying machine driving integrated system, comprising the following steps:

[0028] 1) When the electric clothes dryer is in the process of descending, if the current detection circuit detects that the working current of the brushless DC motor suddenly decreases and exceeds the set value a, the brushless drive unit MCU performs the following control according to the position of the rope reel connected to the brushless DC motor detected by the position detection circuit:

[0029] a) When the rope reel is opened more than or equal to 3 / 4 turns, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse 3 / 4 turns;

[0030] b) When the rope reel is opened less than 3 / 4 of a turn, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse until the rope reel is tightened;

[0031] 2) When the electric clothes dryer is in the upward process, if the current detection circuit detects that the working current of the brushless DC motor suddenly increases and exceeds the set value a, the brushless drive unit MCU performs the following control according to the position of the rope reel connected to the brushless DC motor detected by the position detection circuit:

[0032] a) When the rope reel is less than 3 / 4 of a turn from being fully opened, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse until the rope reel is fully opened;

[0033] b) When the rope reel is opened more than or equal to 3 / 4 turn, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse the rope reel 3 / 4 turn.

[0034] The set value a is 8%.

[0035] Working principle of the present invention:

[0036] The present invention uses a remote controller to send a control signal to a control unit MCU through a remote controller receiving circuit for control:

[0037] When uplinking: the remote control sends an uplink command to the control unit MCU through the remote control receiving circuit, and the control unit MCU transmits the uplink command to the brushless drive unit MCU. The brushless drive unit MCU controls the start of the DC brushless motor through the push circuit and the power amplifier circuit. The rope winder tightens the wire rope driven by the DC brushless motor. When the DC brushless motor starts, the current detection circuit monitors the working current of the DC brushless motor in real time, and amplifies the monitored current signal through the operational amplifier circuit. When encountering resistance, the working current of the DC brushless motor will suddenly increase by more than 8%. At this time, operate according to step 2);

[0038] When downlinking: the remote control sends a downlink command to the control unit MCU through the remote control receiving circuit, and the control unit MCU transmits the downlink command to the brushless drive unit MCU. The brushless drive unit MCU controls the start of the DC brushless motor through the push circuit and the power amplifier circuit. The rope winder unwinds the wire rope driven by the DC brushless motor. When the DC brushless motor starts, the current detection circuit monitors the working current of the DC brushless motor in real time, and amplifies the monitored current signal through the operational amplifier circuit. When encountering resistance, the working current of the DC brushless motor will suddenly decrease by more than 8%. At this time, operate according to step 1).

[0039] When lighting, disinfection, drying or air-drying is required, the corresponding signal is transmitted to the control unit MCU through the remote control, and the control unit MCU controls the operation of the lighting module, disinfection module, drying module and air-drying module.

[0040] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. An obstacle control method for an electric clothes drying machine drive integrated system, characterized in that: The following steps are involved: 1) When the electric clothes dryer is in the downward process, if the current detection circuit detects that the working current of the brushless DC motor suddenly decreases and exceeds the set value a, the brushless drive unit MCU performs the following control according to the position of the rope reel connected to the brushless DC motor detected by the position detection circuit: a) When the rope reel is opened more than or equal to 3 / 4 turns, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse 3 / 4 turns; b) When the rope reel is opened less than 3 / 4 of a turn, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse until the rope reel is tightened; 2) When the electric clothes dryer is in the upward process, if the current detection circuit detects that the working current of the brushless DC motor suddenly increases and exceeds the set value a, the brushless drive unit MCU performs the following control according to the position of the rope reel connected to the brushless DC motor detected by the position detection circuit: a) When the rope reel is less than 3 / 4 of a turn from being fully opened, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse until the rope reel is fully opened; b) When the rope reel is opened more than or equal to 3 / 4 turn, the brushless drive unit MCU controls the brushless DC motor to stop and then reverse the rope reel 3 / 4 turn.

2. The method for controlling the electric clothes drying machine driving integrated system according to claim 1, characterized in that: The set value a is 8%.

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