JPH08200216A - Drive control circuit - Google Patents

Abstract

PURPOSE: To dispense with a correction means such as a volume for correction and realize an efficient control of a drive control circuit for driving a solenoid pump used for a kerosene fan heater and the like by correcting a specified reference pump frequency data of the solenoid pump based on electric voltage data. CONSTITUTION: A solenoid pump drive circuit 1 is provided with a constant- voltage circuit 4 which outputs contant voltage based on DC power outputted by a full wave rectification circuit 3 converting AC power from an AC power source 2 to DC. It is also provided with an applied voltage measuring circuit 5 which measures the actual applied voltage of the solenoid pump MP and outputs it as a first voltage data VD1. The reference pump frequency data of the solenoid pump MP corresponding to the loaded condition is corrected by a controller 8 following a second voltage data VD2, which is based on the output of the first voltage data VD1 and the constant-voltage circuit 4, and the solenoid pump MP is controlled by outputting a correction pump frequency data (control pulse signal) CP to a drive transistor 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control circuit,
In particular, it relates to a drive control circuit for driving an electromagnetic pump or a proportional valve used for an oil fan heater, a gas fan heater, or the like.

[0002]

2. Description of the Prior Art Forced circulation type hot air heaters such as oil fan heaters and gas fan heaters have been known. In these hot air heaters, kerosene or gas as fuel is supplied into the combustion device by an electromagnetic pump (in the case of an oil fan heater) or a proportional valve (in the case of a gas fan heater). The proportional valve is controlled by a drive control circuit so that optimum combustion can be performed.

Here, the drive control circuit of the oil fan heater will be described. The electromagnetic pump uses a biasing force of an electromagnetic force induced in an exciting coil by a spring to linearly reciprocate a plunger to perform a pumping action, and is driven by a constant voltage drive circuit.

FIG. 6 shows a conventional electromagnetic pump drive circuit.
The electromagnetic pump drive circuit 50 is configured to include a constant voltage circuit 51. The constant voltage circuit 51 converts the AC power from the AC power supply 52 into a DC by the full-wave rectification circuit 53,
Electromagnetic pump MP 'through bipolar transistor Q'
When the voltage is supplied to the exciting coil L1 'of the R, the operational amplifier 54 obtains a difference voltage VDIF' which is a difference between the resistor R'and the divided voltage VACT 'of the volume VR and the reference voltage VREF' from the three-terminal regulator 55. Voltage VDIF to resistor R2
It is applied to the base terminal of the bipolar transistor Q'via '.

As a result, a high base voltage is applied to the base terminal of the bipolar transistor Q'in order to increase the applied voltage of the exciting coil L1 'when the applied voltage of the exciting coil L1' drops, so that the exciting coil L1 ' When the applied voltage rises, a low base voltage is applied to lower the applied voltage of the exciting coil L1 '.

[0006]

In the above-mentioned conventional electromagnetic pump drive circuit, the output voltage of the constant voltage circuit has a voltage tolerance of about ± 4% due to the tolerance of the reference voltage and the temperature characteristic. Therefore, it is necessary to adjust the voltage tolerance by the volume VR so that the voltage tolerance is about ± 1%.

Similarly, in the constant current circuit provided in the proportional valve drive circuit of the gas fan heater, since there is a large individual difference in the current-proportional valve opening characteristic, the feedback control of the proportional valve current is performed by the correction volume. It was necessary to adjust the amount of feedback.

An object of the present invention is to provide a drive control circuit capable of performing optimum voltage control or optimum current control without providing a correction means such as a correction volume.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 outputs a constant DC voltage in a drive control circuit having a drive control means for controlling the drive of the electromagnetic pump. Constant voltage output means for
First voltage measuring means for measuring the DC constant voltage and outputting first voltage data, and second voltage data by measuring an actual voltage applied to the electromagnetic pump or a voltage proportional to the actual voltage. A second voltage measuring means for outputting,
The drive control means includes the first voltage data and the second voltage data.
Pump frequency correction means for correcting predetermined reference pump frequency data of the electromagnetic pump corresponding to the load state based on the voltage data and outputting corrected pump frequency data is configured.

According to a second aspect of the present invention, in a drive control circuit having a proportional valve and a drive control means for controlling the drive of the proportional valve, constant current output means for outputting a DC constant current,
First current measuring means for measuring the DC constant current and outputting first current data, and measuring an actual current flowing through the proportional valve or a current proportional to the actual current and outputting second current data. A second current measuring means, and the drive control means corrects predetermined reference proportional valve opening data of the proportional valve corresponding to a load state based on the first current data and the second current data. And a proportional valve opening correction means for outputting opening correction data.

[0011]

According to the first aspect of the invention, the constant voltage output means outputs a constant DC voltage to the electromagnetic pump. The first voltage measuring means measures the DC constant voltage and outputs the first voltage data to the drive control means. In parallel with the output of the first voltage data, the second voltage measuring means measures the actual voltage applied to the electromagnetic pump or a voltage proportional to the actual voltage and outputs the second voltage data to the drive control means. To do. The pump frequency correction means of the drive control means corrects predetermined reference pump frequency data of the electromagnetic pump corresponding to the load state based on the first voltage data and the second voltage data and outputs corrected pump frequency data. As a result, the drive control means drives the electromagnetic pump based on the corrected pump frequency data, and control can be performed while reducing the influence of load fluctuation and temperature characteristic fluctuation.

According to the second aspect of the invention, the constant current output means outputs a direct current constant current to the proportional valve. The first current measuring means measures the DC constant current and outputs first current data to the drive control means. The second current measuring means measures an actual current flowing through the proportional valve or a current proportional to the actual current and outputs second current data to the drive control means. The proportional valve opening correction means of the drive control means corrects predetermined reference proportional valve opening data of the proportional valve corresponding to the load state based on the first current data and the second current data and outputs the opening correction data. To do. As a result, the drive control means controls the opening degree of the proportional valve based on the corrected pump frequency data, and can control by reducing the influence of load fluctuation and temperature characteristic fluctuation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings.

(II) First Embodiment FIG. 1 shows an electromagnetic pump drive circuit. The electromagnetic pump drive circuit 1 includes a full-wave rectifier circuit 3 that converts the AC power from the AC power supply 2 into DC, and a constant voltage circuit 4 that outputs a constant voltage based on the DC power output from the full-wave rectifier circuit 3. Measure the actual applied voltage of the electromagnetic pump MP and measure the first voltage data VD1
Applied voltage measuring circuit 5 for outputting as a signal, a communication interface section 6 for performing an interface operation between the applied voltage measuring circuit 5 and a controller described later, and the first voltage data VD1 input via the communication interface section 6.
And a controller 8 that outputs a control pulse signal CP based on the second voltage data VD2 obtained by converting the output voltage of the constant voltage circuit 4 by the built-in analog / digital converter 7, and an electromagnetic wave based on the control pulse signal CP. And a drive transistor 9 for driving a plunger (not shown) of the pump MP.

The constant voltage circuit 4 receives resistors R3 and R4 for obtaining the divided voltage VACT, a three-terminal regulator 10 for generating and outputting the reference voltage VREF, a divided voltage VACT and the reference voltage VREF, It comprises an operational amplifier 11 which outputs the difference voltage VDIF, and a bipolar transistor Q1 which sets the output voltage to a predetermined constant voltage by applying the difference voltage VDIF to the base terminal via a resistor R2.

The controller 8 is an EEPROM (Electric) for storing the first voltage data and the second voltage data.
aly Erasable and Programmable Read Only Memory) 1
2 is provided.

Next, the operation will be described with reference to the operation flowcharts of FIGS.

First, the controller 8 shifts its operation to a communication processing subroutine (step S1). Then, the controller 8 determines whether or not it is the communication mode (step S11).

If it is determined in step S11 that the controller 8 is not in the communication mode, the process proceeds to step S2. If the communication mode is determined in the determination in step S11, the applied voltage measuring circuit 5 measures the actual applied voltage of the electromagnetic pump MP, and the first voltage data VD1 is sent via the communication interface unit 6.
Communication processing to take in as (step S12), EE
The data is written in the PROM 12 (step S13).

Further, the controller 8 outputs the second voltage data VD2 obtained by converting the output voltage of the constant voltage circuit 4 by the built-in analog / digital converter 7.
The EPROM 12 is written (step S14), and the process proceeds to step S2.

Subsequently, the controller 8 calculates the pump frequency according to the load (step S2).

Next, the controller 8 controls the first voltage V1
The (corrected first voltage data VD1) is corrected by the ratio of the second voltage V2 (corresponding to the second voltage data VD2) to the predetermined constant voltage Vconst to be output by the constant voltage circuit, and the corrected first voltage data DVC1 is obtained (step S3).

Then, from the reference voltage VREF corresponding to the pump frequency calculated in step S2, the corrected first voltage V (first
By subtracting the voltage data VD1 equivalent), the difference voltage V
DEL is calculated (step S4).

The controller 8 refers to the data table based on the obtained differential voltage VDEL, reads the frequency correction data (step S5), and corrects the pump frequency based on the read frequency correction data to respond to the load. The pump is driven (step S6).

With the above configuration, it is possible to obtain the pump frequency corresponding to the change in the voltage applied to the constant voltage circuit due to the load change and the temperature characteristic change, and it is possible to perform more precise control. .

In the above description, the case where the pump frequency is controlled has been described, but it is also possible to change the duty ratio (ON time) for control.

(II) Second Embodiment In the first embodiment, the applied voltage measuring circuit measures the actual applied voltage of the electromagnetic pump and outputs it as the first voltage data. However, as shown in FIG. First, the voltage across the voltage correction resistor R connected in series to the exciting coil L1 in the electromagnetic pump MP is directly measured by the controller 8 '.
It can be configured so that it is handled as the voltage data VD1.

The voltage compensating resistor R is usually incorporated in the electromagnetic pump MP and is unique to each electromagnetic pump so that a desired pump flow rate can be obtained in conformity with the drive voltage output from the constant voltage circuit 4. This is a resistance for correcting variations in the inductance of the exciting coil and mechanical loss (for example, spring force).

(III) Third Embodiment In the above first and second embodiments, the fuel is supplied by using the electromagnetic pump like the oil fan heater, but the third embodiment is as follows. This is an embodiment in the case of supplying fuel using a proportional valve like a gas fan heater.

FIG. 5 shows a proportional valve drive circuit. The proportional valve drive circuit 20 includes a full-wave rectifier circuit 22 that converts AC power from an AC power supply 21 into DC, and a constant-current circuit 2 that outputs a constant current based on the DC power output from the full-wave rectifier circuit 22.
3, a current measuring circuit 24 that measures the current actually flowing through the proportional valve PV and outputs it as the first current data AD1, and a communication interface section 25 that performs an interface operation between the current measuring circuit 24 and a controller described later. An analog / digital converter 30 having a built-in output voltage corresponding to the first current data AD1 input through the communication interface section 25 and the output current of the constant current circuit 23.
And a controller 26 which outputs a control pulse signal CP2 based on the second current data AD2 obtained by the conversion.

In the constant current circuit 23, the control pulse signal CP2 corresponding to the reference current is input to one terminal, and the measurement voltage VMEAS2 corresponding to the current actually flowing in the proportional valve PV is input to the other terminal. The operational amplifier 27 that generates and outputs the control voltage VCNT2 and the drive transistor 28 that is applied with the gate voltage of the control voltage VCNT2 and that sets the current flowing through the proportional valve PV to a predetermined constant current are configured.

The controller 26 uses the first current data AD
EEPR for storing 1 and second current data AD2
Equipped with OM29.

Next, the operation will be described. First, the controller 26 shifts the operation to the communication processing subroutine and determines whether or not it is in the communication mode. When the controller 26 determines that the communication mode is not set, the process proceeds to the normal proportional valve opening adjustment process.

On the other hand, when the controller 26 determines that the communication mode is set, the controller 26 causes the current measuring circuit 24 to determine the proportional valve PV.
The actual current is measured, a communication process for fetching it as the first current data AD1 via the communication interface section 25 is performed, and the data is written in the EEPROM 29. Further, the controller 26 EEPRO the second current data AD2 obtained by converting the output voltage corresponding to the output current of the constant current circuit 23 by the built-in analog / digital converter 30.
M29 is written, and the process proceeds to the normal proportional valve opening adjustment process.

Subsequently, the controller 26 calculates the proportional valve opening degree according to the load.

Next, the controller 26 outputs the first current (corresponding to the first current data AD1) to the second current (second current data AD) corresponding to the predetermined constant current which the constant current circuit 23 should output.
2) to obtain the corrected first current, and subtract the corrected first current from the previously calculated reference current corresponding to the proportional valve opening to obtain the difference current.

The controller 26 refers to the data table on the basis of the obtained differential current, reads out the opening correction data, and corrects the proportional valve opening based on the read opening correction data, thereby responding to the load. Performs proportional valve control.

With the above configuration, it is possible to obtain the proportional valve opening corresponding to the change in the output current of the constant current circuit due to the load change and the temperature characteristic change, and it is possible to perform more accurate control. Becomes

[0039]

According to the first aspect of the present invention, the pump frequency correction means of the drive control means has a predetermined reference pump frequency of the electromagnetic pump corresponding to the load state based on the first voltage data and the second voltage data. Since the data is corrected and the corrected pump frequency data is output, the drive control means drives the electromagnetic pump based on the corrected pump frequency data, and controls by reducing the influence of load fluctuation and temperature characteristic fluctuation. Therefore, efficient and reliable electromagnetic pump control can be performed without providing a correction unit such as a correction volume.

According to the second aspect of the present invention, the proportional valve opening correction means of the drive control means includes the first current data and the second current data.
Since the predetermined reference proportional valve opening data of the proportional valve corresponding to the load state is corrected based on the current data and the opening correction data is output, the drive control means opens the proportional valve based on the opening correction data. Control, and control can be performed while reducing the effects of load fluctuations and temperature characteristic fluctuations.
Efficient and reliable proportional valve control can be performed without providing correction means such as a correction volume.

[Brief description of drawings]

FIG. 1 is a block diagram of an electromagnetic pump drive circuit according to a first embodiment.

FIG. 2 is a main operation flowchart of the first embodiment.

FIG. 3 is a sub-operation flowchart of the first embodiment.

FIG. 4 is a block diagram of an electromagnetic pump drive circuit according to a second embodiment.

FIG. 5 is a block diagram of a proportional valve drive circuit according to a third embodiment.

FIG. 6 is a block diagram of a conventional electromagnetic pump drive circuit.

[Explanation of symbols]

 1 Electromagnetic Pump Drive Circuit 2 AC Power Supply 3 Full Wave Rectifier Circuit 4 Constant Voltage Circuit 5 Applied Voltage Measurement Circuit 6 Communication Interface 7 Analog / Digital Converter 8, 8'Controller 9 Drive Transistor 10 3 Terminal Regulator 11 Op Amp Operational Amplifier 11 12 EEPROM 20 Proportional valve drive circuit 21 AC power supply 22 Full-wave rectifier circuit 23 Constant current circuit 24 Current measurement circuit 25 Communication interface section 26 Controller 27 Operational amplifier 28 Drive transistor 29 EEPROM 30 Analog / digital converter AD1 1st current data AD2 2nd current data CP control Pulse signal CP2 Control pulse signal MP Electromagnetic pump PV Proportional valve R1 Resistance R2 Resistance VD1 First voltage data VD2 Second voltage data VACT Divided voltage VREF Reference voltage VDIF Differential voltage VMEAS measurement voltage VCNT2 control voltage

Claims (2)

[Claims] 1. A drive control circuit having an electromagnetic pump and a drive control means for controlling the drive of the electromagnetic pump, a constant voltage output means for outputting a constant DC voltage, and the first constant voltage data for measuring the constant DC voltage. And a second voltage measuring means for measuring the actual voltage applied to the electromagnetic pump or a voltage proportional to the actual voltage and outputting second voltage data. The drive control means includes the first voltage data and the second voltage data.
A drive control circuit comprising pump frequency correction means for correcting predetermined reference pump frequency data of the electromagnetic pump corresponding to a load state based on voltage data and outputting corrected pump frequency data. 2. A drive control circuit having a proportional valve and a drive control means for controlling the drive of the proportional valve, a constant current output means for outputting a DC constant current, and the DC constant current for measuring the first current data. And a second current measuring unit that outputs a second current data by measuring an actual current that flows through the proportional valve or a current that is proportional to the actual current. The control means includes the first current data and the second current data.
A drive control circuit comprising proportional valve opening correction means for correcting predetermined reference proportional valve opening data of the proportional valve corresponding to a load state based on current data and outputting opening correction data. .