CN203617947U

CN203617947U - Treadmill speed control device

Info

Publication number: CN203617947U
Application number: CN201320829187.7U
Authority: CN
Inventors: 汪起富
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-17
Filing date: 2013-12-17
Publication date: 2014-05-28
Anticipated expiration: 2023-12-17

Abstract

Disclosed is a treadmill speed control device including a power supply module, a power switch IGBT, a sampling resistor and a motor, wherein the power switch IGBT, the sampling resistor and the motor are sequentially connected to the power supply module. The negative electrode of the motor is connected to a low-voltage output end of the power supply module. The treadmill speed control device further comprises a sampled signal processing circuit, a control circuit, a control signal power supply and a drive circuit which are electrically connected to an output end of the power switch IGBT. According to the utility model, the sampling resistor is arranged between the motor and the power switch IGBT, so that affects of the switch-on of the power switch IGBT on the load change sampling of a treadmill are avoided and the accuracy of sampling is ensured; meanwhile, one end of the control circuit is connected with the output end of the power switch IGBT, a reference ground wire of the control circuit is connected to the positive electrode of the motor, an output end of the control circuit is connected to an input end of the power switch IGBT via the drive circuit, and therefore low-voltage control of the power switch IGBT is achieved; and the control of the on-off time ratio of the power switch IGBT enables constant control of the motor speed .

Description

Treadmill speed-regulating control device

Technical field

The utility model relates to a kind of treadmill speed-regulating control device.

Background technology

Because direct current machine detent torque is large, speed governing is simple, therefore in treadmill industry, is generally applied.At present, general treadmill all adopts 180V brush direct current motor, and in theory, direct current machine voltage is from 0V to 180V linear change time, and motor speed is also linear variation from slow to fast.But under actual conditions, in the time that motor coil winding has electric current to flow through, some power consumption, on the resistance of coil, has been done idle work.Particularly add that after load, current of electric is larger, this situation becomes clearly.For example: motor coil winding resistance is 4R, when rotor constant is 30 (rotor constant is a fixed data of coil magnetization voltage and rotating speed), the voltage to motor for 10V.This time empty load of motor, electric current is 0.2A。Motor speed is so: [10-(0.2*4)] * 30=276rpm/Min, if add load to motor, makes its electric current reach 2A.Voltage is constant, and rotating speed is [10-(2*4)] * 30=60rpm/Min; Turn and dropped to 60 and turn from 276, rotation speed change is too large, and in treadmill application, in running process, when human body is and step down in to run and bring, time and leave and run band, i.e. load is to diminish greatly in continuous change, therefore, if do not controlled, velocity variations is too large, and human body adapts to not come, will fall down, cause potential safety hazard.

For above-mentioned technical problem, in adjusting motor speed, must be controlled, the variation (being the variation of electric current) that the moment is detected motor load is compensated the voltage of winding resistance consumption, and the rotating speed making meets the demands.And the speed regulating device of existing running motor, on the one hand, although it can play certain speed-regulating function, it still can not be realized in load variations completely, keeps the function of constant airspeed; On the other hand, its circuit structure complexity, manufacturing cost is high.

Summary of the invention

For solving the problems of the technologies described above, the purpose of this utility model be to provide a kind of circuit structure simple, cheap for manufacturing cost and can realize the treadmill speed-regulating control device that guarantees the constant airspeed of treadmill along with load variations on treadmill.

For achieving the above object, a kind of treadmill speed-regulating control device of the utility model, it comprises supply module, the power switch IGBT being connected with described supply module order, sample resistance, motor, described motor negative pole is connected with the low-voltage output of this supply module, it is characterized in that: described treadmill speed-regulating control device also comprises the sampled signal treatment circuit being electrically connected with power switch IGBT output, control circuit, control signal power supply and drive circuit, the input of described control circuit is connected with the output of sampled signal treatment circuit, its output is connected with the input of described drive circuit, the reference ground wire of described control circuit is connected with the positive pole of motor, and described control signal power supply is electrically connected with the negative pole of described control circuit and motor respectively.

On the basis of such scheme, preferably, described supply module comprises the current rectifying and wave filtering circuit that the output of power supply input port and described power supply input port is electrically connected.

On the basis of such scheme, preferably, between described power supply input port and described current rectifying and wave filtering circuit, be provided with a fuse.

On the basis of such scheme, preferably, described control signal power supply also comprises a bleeder circuit, and the output of this bleeder circuit is connected with described control circuit, and its one end is connected with described motor negative pole.

On the basis of such scheme, preferably, described power switch IGBT is N raceway groove IGBT.

On the basis of such scheme, preferably, described drive circuit comprises a driving chip, and the input of this driving chip is connected with the output of described control circuit, and its output is connected with described power switch IGBT.

On the basis of such scheme, preferably, described driving chip is integrated IGBT/MOS pipe driving chip.

On the basis of such scheme, preferably, described drive circuit comprises a dual operational amplifier LM358.

Compared with prior art, its beneficial effect is the utility model:

Supply module of the present utility model is connected with the motor of treadmill by power switch IGBT, for providing voltage, it drives, and between motor and power switch IGBT, a sample resistance is set, be connected with the output of power switch IGBT by control circuit one end, and the reference ground wire of control circuit is connected with the positive pole of motor, and the output of this control circuit is connected with the input of power switch IGBT by drive circuit, thereby realize, the fast conducting of power switch IGBT is turn-offed and controlled, make the different high voltage direct current of IGBT output ratio with the time ratio turn-offing by power ratio control switch I GBT conducting, thereby realize the constant control to motor speed.

Because the utility model will be put on power switch IGBT, before being arranged on sample resistance by power switch IGBT, the no matter power switch IGBT authenticity that the current signal of the sample resistance that conducting does not all affect gathers, thereby guarantee the variation of load on accurate monitoring of moment treadmill, to make correct response, guarantee the constant airspeed of treadmill; Meanwhile, because there is no the isolation of power switch IGBT between sample resistance and motor, so sampling is also simpler; Adopted is control circuit power supply floatingly, be connected together by the reference ground wire of control circuit and the positive pole of motor, the pattern of low side control of mediating a settlement in the control of power switch IGBT is like this same, i.e. the control of power switch IGBT adopts low voltage control, can effectively prevent that control circuit from burning.

Accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram of treadmill speed-regulating control device of the present utility model.

Fig. 2 is the circuit theory diagrams of treadmill speed-regulating control device of the present utility model.

Fig. 3 is the first control circuit figure of the treadmill speed-regulating control device of prior art.

Fig. 4 is the second control circuit figure of the treadmill speed-regulating control device of prior art.

Fig. 5 is the control circuit figure of treadmill speed-regulating control device of the present utility model.

Fig. 6 is the drive circuit figure of treadmill speed-regulating control device of the present utility model.

Embodiment

By describe in detail the utility model technology contents, structural feature, reached object and effect, below hereby exemplify embodiment and coordinate accompanying drawing to be explained in detail.

Refer to Fig. 1, and in conjunction with consulting shown in Fig. 2 to 6, the utility model provides a kind of treadmill speed-regulating control device, comprise supply module 10, power switch IGBT20 with these supply module 10 order electric connections, sample resistance 30 and motor 70, wherein, these running motor 70 speed regulating device also comprise a sampled signal treatment circuit 40, control circuit 50, control signal power supply 80 and drive circuit 60, the negative pole 72 of this motor 70 is electrically connected with the low-voltage output of supply module 10, the output of the input of described sampled signal treatment circuit 40 and described power switch IGBT20 is electrical connected, the output of this sampled signal treatment circuit 40 is connected with the input of control circuit 50, the input of described drive circuit 60 is connected with the output of control circuit 50, its output is connected with the input of power switch IGBT20, for control and the conducting of driving power switch I GBT20 with close, and the reference ground wire of this control circuit 50 is connected with the positive pole 71 of motor 70, described control signal power supply 80 is electrical connected with described control circuit 50 and the negative pole 72 of motor 70 respectively, wherein, this supply module 10 comprises for electrical input mouth 11, the current rectifying and wave filtering circuit 13 being connected for the protection of the fuse 12 of circuit and with described fuse 12.

When work, civil power 220V voltage is after the access of the mains electricity input end of supply module 10 mouth, input to current rectifying and wave filtering circuit 13 through fuse 12, under the effect of current rectifying and wave filtering circuit 13, the Rectified alternating current of 310V will be become after the line voltage rectification of 220V, and under the effect of filter circuit, reduce pulsation direct voltage in alternating component, thereby it is low to obtain output voltage ripple coefficient, and the direct current that waveform is level and smooth, the 310V direct current of output is electrical connected by power switch IGBT20 and motor 70, by the ON time of power ratio control switch I GBT20, control running machine motor 70 rotating speeds and keep constant when the treadmill load variations to regulate, wherein, due to treadmill in use, the active force that human body step acts on motor 70 is ceaselessly to change, the load that is treadmill is along with the motion of human body paces is changing, in order to overcome the variation of load, institute causes motor 70 rotation speed change excessive, cause the inadaptable security incident that causes of human body, the utility model arranges sample resistance 30 between motor 70 and power switch IGBT20, by sample resistance 30, gather the caused current changing signal of variation because of load on motor 70, thereby obtain load variations information, and after current signal is processed by sampled signal treatment circuit 40, be sent to control circuit 50, by the comparative analysis of control circuit 50, can monitor in real time the load variations on treadmill on the one hand, on the other hand, also can be by the variation of electric current on real-time dynamic monitoring sample resistance 30, the time ratio that regulating power switch I GBT conducting is turn-offed makes the different high voltage direct current of IGBT output ratio, thereby realize the constant control to motor speed, and work as very large that electric current becomes suddenly, when chip sampling has little time reflection, turn off in time drive circuit 60, thereby disconnect power switch IGBT20, to guarantee that circuit can not burn.

For better explanation operation principle of the present utility model, below by contrast prior art control circuit 50 to explain, refer to shown in Fig. 2 and Fig. 3, Fig. 2 is that tradition is by the control circuit 50 of pwm signal control IGBT, this circuit also can obtain the Output rusults identical with this circuit, regulate motor 70 rotating speeds of treadmill in the time that load changes, to keep constant, but because this circuit only could form pressure drop in IGBT conducting on sample resistance 30, when turn-offing, IGBT just sample resistance 30 and motor 70 are disconnected, like this in the time that IGBT disconnects, its current signal sampling not is real signal, particularly when PWM accounting is very little, such as general motor 70 is controlled the PWM carrier wave of use 15K to 20K, when PWM accounting is 1%, actual ON time only has 0.6US, so sort circuit need to add very complicated synchronous circuit in the back, thereby realize the accurate sampling of signal, to guarantee to monitor in real time the variation of load on treadmill.And in Fig. 3, this circuit is because will put on IGBT, so, on the control signal of IGBT and the ground wire of control signal, to add that the voltage exceeding just can make IGBT conducting, the general upper brachium pontis control that adopts use IR2103, the drawback connecting is like this on IR2103, to have born high pressure, once IR2103 goes wrong, what burn is whole control circuits.

Shown in Fig. 4, control circuit 50 of the present utility model comprises a dual operational amplifier LM358, this dual operational amplifier LM358 is provided with 1.2.3.4.5.6.7.8 pin, wherein, 2 pin are connected with sampled signal treatment circuit 40 respectively with 5 pin, 4 pin ground connection, 8 pin are connected with control signal power supply 80, and the cold end of this dual operational amplifier LM358 is connected with the positive pole 71 of motor 70, like this, compare with the traditional control circuit 50 shown in Fig. 2, due to before sampled signal treatment circuit 40 is arranged on the output and sample resistance 30 and motor 70 of power switch, therefore, no matter whether conducting of IGBT, all do not affect the information of load variations on the treadmill that sample resistance 30 gathers, can effectively guarantee the accuracy of sampled data, simultaneously, the cold end of dual operational amplifier is connected with the positive pole 71 of motor 70, so, in the control of power switch IGBT20, adopt the way of putting on the IGBT taking in Fig. 3, power switch IGBT20 is adopted to base pressure control.

Shown in Fig. 6, because line voltage fluctuates, the voltage that the input port 11 of powering is inputted not is 220V all the time, and the output of IGBT reflection is accounting relation, therefore in the time there is fluctuation in line voltage, the output accounting of IGBT is constant, the real work voltage of motor 70 also there will be variation so, for the fluctuation of getting rid of supply power voltage changes the impact on motor 70 rotating speeds, described control signal power supply 80 also comprises a bleeder circuit, the output of this bleeder circuit is connected with described control circuit 50, its one end is connected with described motor 70 negative poles.

As the preferred version of this case, described power switch IGBT20 is N raceway groove IGBT, and due to N raceway groove IGBT, it manufactures simple, stable performance and with low cost, therefore, can guarantee, under the prerequisite of its performance, to effectively reduce manufacturing cost.

Shown in Fig. 5, described drive circuit 60 comprises a driving chip, its input is connected with the output of described control circuit 50, its output is connected with described power switch IGBT20, described driving chip is integrated IGBT/MOS pipe driving chip, the IGBT/MOS pipe driving chip of this drive circuit 60 not only can amplify signal voltage, increase driving force, and, the former transistor drive circuit 60 of comparing, adopt IGBT/MOS pipe driving chip, and integrated level is higher, signal lag and distortion are also less.

In sum, be only the preferred embodiment of the utility model, do not limit protection range of the present utility model with this, all equivalences of doing according to the utility model the scope of the claims and description change and modify, within being all the scope that the utility model patent contains.

Claims

1. treadmill speed-regulating control device, it comprises supply module, the power switch IGBT being connected with described supply module order, sample resistance, motor, described motor negative pole is connected with the low-voltage output of this supply module, it is characterized in that: described treadmill speed-regulating control device also comprises the sampled signal treatment circuit being electrically connected with power switch IGBT output, control circuit, control signal power supply and drive circuit, the input of described control circuit is connected with the output of sampled signal treatment circuit, the output of this control circuit is connected with the input of described drive circuit, the reference ground wire of described control circuit is connected with the positive pole of motor, and described control signal power supply is electrically connected with the negative pole of described control circuit and motor respectively.

2. speed regulating device for running machine as claimed in claim 1, is characterized in that: described supply module comprises the current rectifying and wave filtering circuit that the output of power supply input port and described power supply input port is electrically connected.

3. speed regulating device for running machine as claimed in claim 2, is characterized in that: between described power supply input port and described current rectifying and wave filtering circuit, be provided with a fuse.

4. speed regulating device for running machine as claimed in claim 1, is characterized in that: described control signal power supply also comprises a bleeder circuit, and the output of this bleeder circuit is connected with described control circuit, and its one end is connected with described motor negative pole.

5. speed regulating device for running machine as claimed in claim 1, is characterized in that: described power switch IGBT is N raceway groove IGBT.

6. speed regulating device for running machine as claimed in claim 1, is characterized in that: described drive circuit comprises a driving chip, and the input of described driving chip is connected with the output of this control circuit, and its output is connected with described power switch IGBT.

7. speed regulating device for running machine as mutual in claim 6, is characterized in that: described driving chip is integrated IGBT/MOS pipe driving chip.

8. speed regulating device for running machine as claimed in claim 1, is characterized in that: described drive circuit comprises a dual operational amplifier LM358.