JPH0449892A - Pump drive - Google Patents

Abstract

PURPOSE:To finely set the discharge of a pump by combining driving pulse voltages of different duties and generating the voltages one after another with a regular period to regulate the discharge of the pump. CONSTITUTION:The combinations of driving pulse voltages of different duties are programmed beforehand according to the discharge of a pump. A control circuit 4 selects a combination corresponding to the preset discharge from the program based on the select-set signal from a selector-setter 6 and generates and transmits pulse signals according to the selected combination. The pulse signals transmitted from the control circuit 4 with a regular period drive a photocoupler 3, a gate signal is transmitted to a MOSFET Q1, the MOSFET Q1 is turned on for a time corresponding to the duty of the pulse signals, and driving pulse voltage of the same duty as the pulse signals is applied to a pump driving motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a pump drive device for duty-driving a pump drive motor such as a gear pump.

[Prior Art] A pump drive device that controls the discharge amount of a pump by changing the rotational speed of a motor that drives a so-called gear pump for a washer installed in a toilet seat with a washer includes a system that continuously controls current. A duty drive system is adopted, which has a simpler circuit configuration than analog control, and can create pulse signals using a microcomputer that can be used for other signal processing.

This duty drive method uses a microcomputer to generate a pulse signal with a constant period, turns the drive circuit on and off using this pulse signal, and applies a drive pulse voltage to the pump drive motor, which controls the duty of the drive pulse voltage. By varying this, it is possible to control the rotation of the pump drive motor and set the discharge amount of the pump.

[Problems to be Solved by the Invention] In the case of a toilet seat with a washer, etc., the water supply hose connected to the washer pump may resonate and vibrate greatly depending on the cycle of duty control of the pump drive motor. Therefore, countermeasures such as reducing the cycle may be necessary.

However, the minimum duty of the drive pulse voltage is determined by the resolution of the microcombiner used, regardless of the cycle size.
If the period is 22 m5ee, then 1/22
~22/22. A device that can set the discharge amount in 22 steps at t, but if the cycle is reduced to 7 s+see, the pump can only set the discharge amount in 7 steps from 1/7 to 7/7, and the finer details of the pump There was a problem that the discharge amount could not be set.

The present invention was made in view of the above-mentioned problems.
The purpose is to provide a pump drive device that can finely set the pump discharge amount.

In order to achieve the above-mentioned object, the present invention applies a drive pulse voltage generated at a constant cycle to a motor for driving a pump, and changes the duty of the drive pulse voltage to increase the pump discharge amount. This pump drive device is equipped with means for adjusting the pump discharge amount by combining drive pulse voltages with different duties and sequentially generating them at a constant cycle.

[Function] According to the present invention, the pump discharge amount is adjusted by combining drive pulse voltages with different duties and sequentially generating them at a constant period. Even if the cycle is small, the rotation of the pump drive motor can be precisely controlled.
It becomes possible to finely set the pump discharge amount.

[Example] The present invention will be explained below using examples.

FIG. 1 shows a circuit according to an embodiment of the present invention, in which a pump driving motor 1 is a DC motor, and 5 drive circuits 2
It is connected to the DC power supply VDc via the MOS-FETQ. The gate of the MOS-FET Ql is connected to the emitter resistance of the phototransistor Q of the photocoupler 3.

The photocoupler 3 is driven by a signal from a control circuit 4 made up of a microcomputer, and the control circuit 4 generates a pulse signal of a constant period (for example, 7 m5ec) based on the tarok of a clock generation circuit 5 to output the photocoupler 3. It is designed to drive coupler 3.

Further, the duty of this pulse signal can be set, for example, in units of 1 ms, and pulse signals of different duties can be generated in combination alternately.

This combination is programmed in advance in accordance with the discharge amount of the pump, and the control circuit 4 selects a combination according to the set discharge amount from the program based on the selection setting signal of the selection setting section 5 and controls the combination according to the combination. Create and output a pulse signal.

Then, a pulse signal is generated from the control circuit 4 at a constant period, and the photocoupler 3 is driven by this pulse signal, and the M O
Give a gate signal to S F E T Q +, MOS
-FETQ is turned on for a period corresponding to the duty of the pulse signal, and a drive pulse voltage having the same duty as the pulse signal is applied to the pump drive motor 1.

Figure 2 shows an example of a combination of driving pulse voltage duties; in this case, the duty is 2-5ec and 35s.
This shows a state in which driving pulse voltages with ec are generated alternately.

By appropriately setting the combination of duties in this manner, the rotation of the motor 1 can be finely controlled and the pump discharge amount can be set in multiple stages.

[Effects of the Invention] The present invention provides a pump drive device that applies a drive pulse voltage generated at a constant cycle to a pump drive motor and changes the duty of the drive pulse voltage to vary the pump discharge amount. Equipped with a means to adjust the pump discharge amount by combining pulse voltages and sequentially generating them at a constant cycle.By appropriately combining drive pulse voltages with different duties, it is possible to finely control the rotation of the pump drive motor. Even if the resolution of the microcomputer is limited, it is possible to finely set the discharge amount of the pump, and as a result, it is possible to drive the pump in small cycles, and there are advantages in that it is possible to take measures against vibrations and the like.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and the second section is a waveform diagram showing an example of the same drive pulse signal. 1 is a motor for driving the pump, 2 is a drive circuit, 3 is a photocoupler, and 4 is a control circuit. Agent Patent Attorney Ishi 1) Chief Figure 7 2

Claims (1)

[Claims] (1) In a pump drive device that applies a drive pulse voltage generated at a constant cycle to a pump drive motor and changes the duty of the drive pulse voltage to vary the pump discharge amount, it is possible to combine drive pulse voltages with different duties. A pump drive device characterized by comprising means for adjusting the pump discharge amount by sequentially generating the discharge amount at a constant period.