JP2585381Y2 - Fan motor drive power supply for combustion equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive power supply for an AC motor and a DC motor used for driving a fan for blowing combustion air of a combustion device such as a water heater.

[0002]

2. Description of the Related Art There are two types of fan motors generally used for water heaters: an AC motor and a DC motor.
AC motors and DC motors are selectively used depending on the capacity, size and cost of the water heater. Further, the drive power supply device for these motors is a device dedicated to each of an AC motor and a DC motor, and is generally composed of a power supply unit, a drive unit, a control unit, and the like, and is generally mounted on the same substrate.

[0003]

In such a conventional fan motor drive power supply, when changing the capacity and dimensions of the fan by changing the model of the water heater, the change from the AC motor to the DC motor, or Whenever a change from a DC motor to an AC motor occurs, it is necessary to change the circuit configuration of the fan motor drive power supply device and the design of the board each time, which requires time and expense.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a common circuit unit that can be used for either an AC motor or a DC motor, and to change from an AC motor to a DC motor or to use a DC motor. An object of the present invention is to provide a motor drive power supply device for a fan such as a water heater that can minimize a change in circuit and board design when changing from a motor to an AC motor.

[0005]

In order to solve the above-mentioned problems, a motor drive power supply device for a fan of a combustion apparatus according to the present invention comprises a common circuit section comprising a control section and an AC voltage phase control circuit. A voltage output section for outputting a voltage controlled by the AC voltage phase control circuit is provided in the common circuit section, and when the AC motor is driven, the AC motor is connected to the voltage output section, and when the DC motor is driven, A DC switching power supply circuit is connected to the voltage output section, and the DC motor is connected to the DC switching power supply circuit.

[0006] The output unit is provided for driving the AC motor.
Switching means for switching between DC motor drive
And features.

[0007]

When driving an AC motor, the AC motor is directly connected to a common circuit unit including a control unit and an AC voltage phase control circuit to perform drive control.
A DC switching power supply circuit is connected to the voltage output section of the common circuit section, and the DC motor is driven and controlled by the DC switching power supply circuit.

[0008] Also, the AC motor drive is provided to the output unit.
And the DC motor drive Switching means
Free to drive AC motor or DC motor
Can be selected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a motor drive power supply for a fan of a combustion device corresponding to an AC single-phase motor (hereinafter, referred to as an AC motor) as an AC motor for a fan and a DC three-phase brushless motor (hereinafter, referred to as a DC motor) as a DC motor. 1 shows a block configuration of an apparatus.

[0010] Motor drive power supply 1 for a fan of a combustion apparatus
00 is a common circuit section 7, a DC switching power supply circuit 10
Is provided. The common circuit unit 7 includes the control unit 1, the AC voltage phase control circuit 5, and the voltage output unit 6. Further, the control unit 1 includes an input unit 2, a calculation unit 3, and an output unit 4.

The control unit 1 comprises a microprocessor (microcomputer) with a built-in program, or a logic circuit or various dedicated control circuits.

The AC voltage phase control circuit 5 comprises a bidirectional thyristor (triac) or the like.

The voltage output unit 6 includes switching means 6a such as a two-circuit interlocking changeover switch, and outputs an AC voltage controlled by the AC voltage phase control circuit 5 for driving the AC motor 8.
Alternatively, switching is performed by the switching means 6a so as to supply the DC switching power supply circuit 10 connected for driving the DC motor 21. This switching means 6a is operated by the user.

[0014] On the other hand, the DC switching power supply circuit 10,
Rectifier circuit 11, smoothing circuit 12, transformer circuit 13, smoothing circuit 14, switching circuit 15, feedback circuit 16
, A drive circuit 18 comprising a diode / transistor array, and a DC three-phase brushless motor drive circuit 20 comprising an excitation switching circuit 19, and are mounted on the same substrate.

[0015] Next, the operation of the fan motor driving power supply apparatus 100 of the combustion equipment. First, when an AC motor is used, the AC motor 8 is connected to the voltage output unit 6, and a rotation speed signal 9 a of a rotation speed sensor 9 such as an encoder or a resolver built in or directly connected to the AC motor 8 is transmitted to the control unit 1. Is connected to the input unit 2.

The arithmetic unit 3 issues a control command to control the number of revolutions of the fan according to the combustion amount of the water heater, and this control command is input to the AC voltage phase control circuit 5 by the output unit 4 as a control signal 4b. Is done.

FIG . 2 is an explanatory diagram of the control by the AC voltage phase control circuit 5. The AC voltage phase control circuit 5 controls the AC voltage energization timing so that the AC voltage is turned ON from the zero cross point of the commercial AC voltage (AC 100 V) for a time t and turned OFF until the next zero cross point. By adjusting the energization timing, the rotation speed of the AC motor 8 connected to the voltage output unit 6 is controlled.

The rotation speed of the AC motor 8 detected by the rotation speed sensor 9 is fed back to the control unit 1 as a rotation speed signal 9a.
The energization time t is adjusted.

[0019] Next When using DC motor, the voltage supplied to the DC switching power source circuit 10 switches the switching means 6a of the voltage output portion 6 of the common circuit section 7.

[0020] The position detection signal 21a from the DC motor 21
The target rotation speed command signal 4a for sending the rotation speed signal 19a of the DC motor detected by the excitation switching circuit 19 to the input unit 2 and the predetermined rotation speed command from the arithmetic unit 3 to the DC switching power supply circuit 10 based on Feedback circuit 16
, Respectively.

Although the DC switching power supply circuit 10 is suitable for large power control due to its characteristics, it is not suitable for low power control. Therefore, in this embodiment, a large power, for example, D
When controlling in the range of C50V to 20V, AC10
0V voltage is not controlled by the AC voltage phase control circuit 5;
The 00V voltage is supplied as it is to the rectifier circuit 11 on the primary side of the DC switching power supply circuit 10, and the switching circuit 15
A predetermined number of revolutions control is performed only by the above.

The applied voltage is, for example, DC 20 V to 5 V
Is relatively small, the DC switching power supply circuit 10
Since the control performance is reduced at low efficiency with only the control, the control is performed using both the AC voltage phase control circuit 5 and the switching circuit 15.

The present invention can be applied to a case where the voltage of a commercial AC power supply is subjected to pulse width modulation (PWM) to control the rotation of the motor.

[0024]

As described above, the motor drive power supply device for a fan of a combustion apparatus according to the present invention comprises an AC motor or a DC motor by forming a common circuit unit including a control unit and an AC voltage phase control circuit. Circuits and substrates corresponding to the motor can be easily changed in design, thereby reducing costs by reducing the number of processes. For a DC motor, by combining the control of the AC voltage phase control circuit and the control of the DC switching power supply circuit, highly efficient control over a wide range is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a motor drive power supply device for a fan of a combustion device according to the present invention.

FIG. 2 is an explanatory diagram of a control example of an AC voltage phase control circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control part 2 Input part 3 Calculation part 4 Output part 4a Target rotation speed command signal 5 AC voltage phase control circuit 6 Voltage output part 6a Switching means 7 Common circuit part 8 AC (AC) motor 9 Revolution sensor 9a, 19a Revolution Signal 10 DC switching power supply circuit 21 Direct current (DC) motor 100 Motor drive power supply for fan of combustion equipment

──────────────────────────────────────────────────続 き Continued on the front page (56) References Japanese Utility Model Showa 60-143250 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23N 3/08

Claims (2)

(57) [Scope of request for utility model registration] 1. An AC motor comprising: a common circuit section including a control section and an AC voltage phase control circuit; and a voltage output section for outputting a voltage controlled by the AC voltage phase control circuit in the common circuit section. When driving the DC motor, the AC motor is connected to the voltage output unit, and when the DC motor is driven, a DC switching power supply circuit is connected to the voltage output unit, and the DC motor is connected to the DC switching power supply circuit. A motor drive power supply device for a fan of a combustion apparatus, characterized by the following. 2. An output unit for driving the AC motor.
Switching means for switching between the DC motor drive and
The fan module for a combustion apparatus according to claim 1, wherein
Data drive power supply.