JP3531052B2 - Heater power supply - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a heater, and more particularly to a power supply device for a heater, which includes three types of power sources: a power storage area, an external DC power supply, and an external AC power supply. It is possible to stabilize the DC supplied to the heater when operating with an external AC power supply, and to stabilize in response to a wide range of input voltage when operating with an external DC power supply, The present invention relates to a heater power supply device that can function as a post-discharge charger when operating on a power storage area, can reduce the power supply capacity, and can achieve miniaturization. 2. Description of the Related Art Some heaters for burning and heating fuel are operated by a DC power supply. Some of the heaters include, for example, a pump for pumping fuel, an ignition transformer for igniting fuel, and a fan motor for feeding combustion heat. The heater supplies a direct current to a pump, an ignition transformer, and a fan motor by a power supply device. [0003] The power supply unit operates by supplying a direct current to the pump, the ignition transformer, and the fan motor when the heater is ignited, and ignites the fuel pumped by the pump by the ignition transformer. In addition, the power supply device stops the operation of the ignition transformer while continuing the operation of the pump and the fan motor during the heater operation after the ignition. Some of such heater power supply devices have a built-in storage battery as a DC power supply, and operate by supplying a DC from the storage battery. Some power supply devices for heaters do not incorporate a storage battery as a DC power supply, but input power from an external AC power supply such as a commercial power supply, convert the power to DC, and supply the DC to operate. [0005] However, the heater power supply device having a built-in storage battery as the DC power supply has a fixed output voltage and current, and therefore has a large voltage and current required by the heater specifications. Generally, the current is set. For this reason, such a power supply device has to select a power supply having a large power supply capacity, and there is a problem that the power supply device becomes large. [0006] The heater power supply device having a built-in storage battery as a DC power supply has a problem that power cannot be input from an external AC power supply such as a commercial power supply. Similarly, a heater power supply device that inputs power from an external AC power supply such as a commercial power supply has a problem that an external DC power supply cannot be input. For this reason, there has been a problem that the conventional heater power supply device cannot cope with the three types of power supplies of the external DC power supply, the external AC power supply, and the storage battery as the power supply of the heater operated by DC. In order to eliminate the above-mentioned disadvantages, the present invention provides a heater having a pump, an ignition transformer, and a fan motor, and the pump, the ignition transformer, and the fan of the heater are provided. A heater control unit for controlling a motor and an internal power supply circuit for supplying a direct current from the built-in storage battery to the heater control unit; an external DC power input unit and an external AC power input unit; An external power supply circuit is provided that adjusts the DC input to the DC and the DC converted and input to the external AC power input unit to a set voltage and outputs the voltage to the heater control unit via the internal power supply circuit. The output DC voltage setting is switched between a set voltage for heater operation and a set voltage for heater stop by the heater operation signal of the heater control unit. A voltage setting switching circuit for setting a DC current output from the external power supply circuit to a setting current for operating the ignition transformer and a setting current for stopping the ignition transformer according to an ignition transformer operation signal of the heater control unit. A setting switching circuit is provided, and it is determined whether or not the DC voltage input to the external DC power supply input section exceeds a set voltage, and if not, the external power supply circuit is bypassed and the internal power supply circuit is bypassed. An input voltage determination circuit is provided for inputting the voltage to the heater control unit via the controller and for inputting the voltage to the external power supply circuit when the voltage exceeds the input voltage to adjust the voltage to the set voltage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heater power supply device according to the present invention comprises:
An internal power supply circuit that supplies DC from a built-in storage battery to a heater pump, an ignition transformer, and a fan motor via a heater control unit, and adjusts DC from an external DC power supply and an external AC power supply to a set voltage to set an internal power supply circuit An external power supply circuit that outputs to the heater control unit through the power supply is provided, so that a direct current is supplied to the heater from three types of power sources, a power storage ground, an external DC power source, and an external AC power source, as a power source for the heater operated by DC. be able to. The power supply apparatus further includes a voltage setting switching circuit for switching a DC voltage output from an external power supply circuit between a heater operation setting voltage and a heater stop setting voltage by a heater operation signal. Since a current setting switching circuit is provided for switching the setting of the DC current output from the power supply circuit to the setting current for ignition transformer operation and the setting current for ignition transformer stop according to the ignition transformer operation signal,
Using the heater operation signal and the ignition transformer operation signal, the voltage and current settings can be switched and output depending on when the heater is ignited, when the heater is operating after the end of ignition, and when the storage battery is charged after the heater is stopped. Accordingly, it is not necessary to hold the power capacity of the maximum capacity for a short period of time as in the case of the ignition of the heater, and the power capacity can be determined in the state of the continuous load as in the heater operation after the end of the ignition. Further, the power supply apparatus determines whether or not the DC voltage input to the external DC power supply input section exceeds a set voltage, and if not, bypasses the external power supply circuit and sets a heater control section. DC voltage can be supplied to the heater without being affected by a change in the input voltage by providing an input voltage determination circuit for adjusting the set voltage by inputting the voltage to an external power supply circuit when the input voltage exceeds the input voltage. . Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 1, 2 is a heater, 4 is a pump, 6 is an ignition transformer, and 8 is a fan motor. The heater 2 includes a pump 4 for pumping the fuel and an ignition transformer 6 for igniting the fuel.
And a fan motor 8 for supplying combustion heat. The heater 2 ignites the fuel pumped by the pump 4 by an ignition transformer 6, supplies combustion heat by a fan motor 8, and supplies hot air to the object to be dried. The operation of the heater 2 is controlled by a heater control unit 10. The heater control unit 10 outputs a heater operation signal and an ignition transformer operation signal, and controls operations of the pump 4, the ignition transformer 6, and the fan motor 8. A power supply 1 for supplying power to the heater 2
2 includes an internal power supply circuit 14, an external power supply circuit 16, a voltage setting switching circuit 18, a current setting switching circuit 20, and an input voltage determination circuit 22. The internal power supply circuit 14 includes a built-in storage battery 24.
Are connected to the heater control unit 10, respectively.
A changeover switch 26 and a voltage detection switch 64 of a voltage detection relay 62 described later are provided on the positive electrode side of the storage battery 24, and a diode 28 is provided on the input side of the changeover switch 26 and the voltage detection switch 64. The internal power supply circuit 14 supplies a direct current to the pump 4, the ignition transformer 6, and the fan motor 8 through the heater control unit 10 from the built-in storage area 24 by the changeover switch 26 and the voltage detection switch 64. The external power supply circuit 16 has an external DC power input section 30 and an external AC power input section 32. An external DC power supply and an external AC power supply (not shown) are selectively connected to the external DC power supply input section 30 and the external AC power supply input section 32, respectively. The external DC power supply input section 30 has a positive electrode connected to an input voltage determination switch 76 of an input voltage determination relay 74 described later.
Is connected to the diode 28 of the internal power supply circuit 14, and the negative electrode is connected to the negative electrode of the storage battery 24 of the internal power supply circuit 14. A transformer 34 and a rectifier 36 are connected to the external AC power supply input section 32. External power supply circuit 1
The output of No. 6 has its positive electrode connected to the diode 28 of the internal power supply circuit 14 via the input voltage determination switch 76,
The negative electrode is connected to the negative electrode of the storage battery 24 of the internal power supply circuit 14. The external AC power supply input section 32 includes a rectifier 3
The positive electrode of the external DC power supply input section 30 is connected to the positive electrode of the power supply 6 via a diode 38. The external AC power input unit 32 has a transistor 40 and a coil 42 interposed between the positive electrode of the rectifier 36 and the input voltage determination switch 76, and has a capacitor 44, a diode 46, The voltage detection relay 62 is connected, and a resistor 48 is provided between the negative electrode of the rectifier 36 and the voltage detection relay 62. The external power supply circuit 16 converts the DC input to the external DC power input 30 and the DC input to the external AC power input 32 and converted by the transformer 34 and the rectifier 36 by a capacitor 44 and a diode 46. The voltage is adjusted to the set voltage, and the heater controller 1 is controlled via the internal power supply circuit 14.
Output to 0. The voltage setting switching circuit 18 includes a voltage setting switch 50 that is turned on / off by a heater operation signal from the heater control unit 10, a voltage setting unit 52 that sets a determination voltage using the voltage setting switch 50, and a rectifier. A voltage detection unit 54 is provided between the positive and negative electrodes 36, and a comparator 56 that compares a set voltage of the voltage setting unit 52 with a detection voltage of the voltage detection unit 54 and outputs a signal to the transistor 40 is provided. The voltage setting switching circuit 18 includes the heater control unit 1
The voltage setting switch 50 is turned on / off by a heater operation signal indicating operation / stop of the heater 2 of 0, and a control signal is output from the comparator 56 to the transistor 40 by turning on / off of the voltage setting switch 50. Is ON, the heater operation set voltage (for example, 12 V) is set, and when the voltage setting switch 50 is OFF, the heater stop set voltage (for example, 14 V) is set. Thus, the voltage setting switching circuit 18 converts the DC voltage output from the external power supply circuit 16 into a heater operation set voltage and a heater stop set voltage by the heater operation signal of the heater control unit 10. Switch. The current setting switching circuit 20 includes a current setting switch 58 that is turned on / off by an ignition transformer operation signal of the heater control unit 10, and a current setting unit 60 that sets a determination current by the current setting switch 58. A voltage detection relay 62 is provided between the positive and negative electrodes of the rectifier 36 as a current detection unit.
And the voltage detection switch 6 of the voltage detection relay 62
4 is provided in the internal power supply circuit 14, and a comparator 66 that compares a set current of the current setting unit 60 with a detection current of the voltage detection relay 62 serving as a current detection unit and outputs a signal to the transistor 40 is provided. The current setting switching circuit 20 includes a heater control unit 1
The current setting switch 58 is turned on / off by an ignition transformer operation signal indicating operation / stop of the ignition transformer 6 of 0,
When the current setting switch 58 is turned on and off, the voltage detection switch 64 of the voltage detection relay 62 is switched, and a control signal is output from the comparator 66 to the transistor 40. A set current for ignition transformer operation (for example, 6 A or more), and a set current for ignition transformer stop (for example, 3 A) for constant load operation in which the current is limited when the current setting switch 58 is off. And Thus, the current setting switching circuit 20 sets the DC current output from the external power supply circuit 16 based on the ignition transformer operation signal of the heater control unit 10 for the ignition transformer operation setting current and the ignition transformer stop setting. And the current switch 64 is switched. The input voltage determination circuit 20 includes a voltage setting section 68 for setting a determination voltage.
A voltage detection unit 70 connected to the positive electrode of 0 is provided, and a comparator 72 for comparing a set voltage of the voltage setting unit 68 with a detection voltage of the voltage detection unit 70 and outputting a signal is provided. An input voltage determination relay 74 is provided, and the input voltage determination switch 76 of the input voltage determination relay 74 is connected to the positive output terminal of the external DC power input unit 30 and the positive output terminal of the rectifier 36 of the external AC power input unit 32. And the diode 28 of the internal power supply circuit 14. The input voltage determination circuit 20 includes a voltage setting section 68
And the detected voltage of the voltage detecting unit 70 is compared and determined by the comparator 72, and based on the determination result of the comparator 72, the input voltage determining relay 74 is turned on and off, and the input voltage determining switch 76 is switched to operate. The voltage of the power supply (for example, 12 V) is directly used as the internal power supply circuit 1
4 and when the voltage of the external DC power supply (for example, 24 V) is high, the voltage is adjusted to a set voltage by the capacitor 44 and the diode 46 and output to the internal power supply circuit 14. Thus, the input voltage determination circuit 20 determines whether or not the DC voltage input to the external DC power supply input section 30 exceeds the set voltage, and if not, bypasses the external power supply circuit 16. Then, the voltage is input to the heater control unit 10 via the internal power supply circuit 14, and when it exceeds the threshold, the data is input to the external power supply circuit 16 to adjust the voltage to the set voltage. FIG. 2 shows a specific circuit of the voltage setting switching circuit 18. 3 and 4 show more specific examples of the current setting switching circuit 20, respectively. Next, the operation will be described. The power supply device 12 of the heater 2 switches the changeover switch 26 of the internal power supply circuit 14 so that the direct current of the built-in storage battery 24 is passed through the heater control unit 10 to the pump 4 of the heater 2, the ignition transformer 6 and the fan. It is supplied to the motor 8. When an external DC power supply (not shown) is connected to the external DC power supply input section 30 of the external power supply circuit 16, the power supply 12 applies the DC of the external DC power supply to the heater 2 via the heater control section 10. The power is supplied to the pump 4, the ignition transformer 6, and the fan motor 8. At this time, the power supply circuit 12 determines whether or not the DC voltage input to the external DC power supply input section 30 by the input voltage determination circuit 20 exceeds the set voltage, and switches the input voltage determination switch 76. If it does not exceed, the external power supply circuit 16 is bypassed and input to the heater control unit 10 via the internal power supply circuit 14, and if it exceeds, it is input to the external power supply circuit 16 and adjusted to the set voltage. The data is input to the heater control unit 10 via the circuit 14. The power supply device 12 includes an external power supply circuit 16.
External AC power supply (not shown)
Is connected, the external AC power is converted into DC by the transformer 34 and the rectifier 36, and this DC is
The voltage is adjusted to a set voltage by the diode 46 and the pump 4 of the heater 2 and the ignition transformer 6 via the heater control unit 10.
And the fan motor 8. The power supply unit 12 inputs a heater operation signal of the heater control unit 10 and an ignition transformer operation signal to an external DC power supply and an external AC power supply, and supplies the pump 4 of the heater 2, the ignition transformer 6 and the fan motor. 8 and the power storage location 24 are set to the required voltage and current, and output to the heater control unit 10 via the internal power supply circuit 14. The power supply unit 12 starts the operation of the heater 2, and when a heater operation signal indicating the operation of the heater 2 of the heater control unit 10 is input to the voltage setting switching circuit 18, the power supply unit 12 outputs the heater operation signal from the external power supply circuit 16. When a DC voltage setting is set to a heater operation setting voltage (for example, 12 V), and an ignition transformer operation signal indicating the operation of the ignition transformer 6 of the heater control unit 10 is input to the current setting switching circuit 20, an external The setting of the DC current output from the power supply circuit 16 is the set current for ignition transformer operation (for example, 6 A or more).
And Thus, the power supply unit 12 supplies the maximum amount of power to the ignition transformer 6 to ignite the fuel pumped by the pump 4. When the heater control unit 10 detects that the fuel has been ignited by combustion detection means (not shown), the operation of the ignition transformer 6 is stopped. When a heater operation signal indicating the operation of the heater 2 of the heater control unit 10 is input, the power supply device 12
The DC voltage output from the external power supply circuit 16 is set as a heater operation setting voltage (for example, 12 V), and an ignition transformer operation signal indicating the stop of the ignition transformer 6 of the heater control unit 10 is output from the current setting switching circuit 20. Is entered into
The DC current output from the external power supply circuit 16 is set as the ignition transformer stop current (for example, 3 A). Thus, the power supply device 12 supplies power for constant load operation to the pump 4 and the fan motor 8 of the heater 2 to continue combustion. When the operation of the heater 2 is stopped, the power supply unit 12 sets the DC voltage output from the external power supply circuit 16 to the heater by inputting a heater operation signal indicating that the heater 2 is stopped by the heater control unit 10. A set voltage for stop (for example, 14 V), an ignition transformer operation signal indicating stop of the ignition transformer 6 of the heater control unit 10 is input to the current setting switching circuit 20, and a direct current output from the external power supply circuit 16 is output. The current is set to a set current for stopping the ignition transformer (for example, 3 A). As a result, when the operation of the heater 2 is stopped, the power supply unit 12 sets the heater stop set voltage (for example, 14 V).
V) and set current for stopping the ignition transformer (for example, 3 A)
, The storage battery 24 can be charged. As described above, the power supply device 12 of the heater 2
Is provided with an internal power supply circuit 14 for supplying DC from a built-in storage battery to the pump 4 of the heater 2, the ignition transformer 6, and the fan motor 8 via the heater control unit 10, and sets DC by an external DC power supply and an external AC power supply. By providing an external power supply circuit 14 which adjusts the voltage and outputs the voltage to the heater control unit 10 via the internal power supply circuit 12, the power storage 24, an external DC power supply and an external AC power supply are used as power supplies for the heater 2 operated by DC. DC can be supplied to the heater 2 from the three types of power sources. For this reason, the power supply device 12 can correspond to three types of power supply of the storage battery 24, an external DC power supply, and an external AC power supply as the power supply of the heater 2 operated by DC. Further, the power supply device 12 includes a voltage setting switching circuit 18 for switching the DC voltage output from the external power supply circuit 16 between a heater operating setting voltage and a heater stopping setting voltage in accordance with a heater operation signal. A current setting switching circuit 2 for switching the setting of the DC current output from the external power supply circuit 16 to a setting current for operating the ignition transformer and a setting current for stopping the ignition transformer according to an ignition transformer operation signal.
0, the voltage and current are set using the heater operation signal and the ignition transformer operation signal at the time of ignition by the ignition transformer 6 of the heater 2, at the time of heater operation after the end of ignition, and at the time of storage battery 24 after the heater is stopped. The output can be switched depending on when the battery is charged, so that it is not necessary to hold the power capacity of the maximum capacity for a short time as when the heater 2 is ignited. The power supply capacity can be determined in the state of the continuous load, and the power supply capacity can be reduced. Therefore, the power supply device 12 can stabilize the DC supplied to the heater 2 when operating with an external DC power supply or an external AC power supply, and can reduce the discharge after discharging when operating with a storage battery. The battery can function as a charger, the power supply capacity can be reduced, and downsizing can be achieved. Further, when the DC voltage input to the external DC power supply input section 32 does not exceed the set voltage, the power supply apparatus 12 allows the external power supply circuit 16 to be bypassed and input to the heater control section 10 and to exceed the set voltage. In this case, since the input voltage determination circuit 20 for inputting the voltage to the external power supply circuit 16 and adjusting the voltage to the set voltage is provided, the direct current can be supplied to the heater 2 without being affected by the change in the input voltage. Therefore, the power supply device 12 can support a wide range of the input voltage input to the external DC power supply input section 32 and can supply a stable DC to the heater 2. As described above, the heater power supply device according to the present invention supplies direct current to the heater from three types of power sources, namely, a storage battery, an external DC power source, and an external AC power source, as the power source for the heater operated by DC. In addition, the voltage and current can be set and output by using the heater operation signal and the ignition transformer operation signal depending on when the heater is ignited, when the heater is operated, and when the battery is charged after the heater is stopped. This eliminates the need to maintain the maximum rated power capacity for a short period of time, as when the heater is ignited, and allows the power capacity to be determined in a continuous load state, such as when the heater is operating after the end of ignition. In addition, a direct current can be supplied to the heater without being affected by a change in the input voltage. For this reason, the power supply device for the heater can correspond to three types of power sources, that is, a storage battery, an external DC power supply, and an external AC power supply, as a power supply for the heater operated by DC. In the case of operation by the power source, the direct current supplied to the heater can be stabilized, and in the case of the operation by the power storage area, it can function as a charger after discharging, and the power supply capacity can be made small, and the size can be reduced. In addition, when operating with an external DC power supply, stabilization can be achieved corresponding to a wide range of input voltage.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a heater power supply device according to an embodiment of the present invention. FIG. 2 is a specific circuit diagram of a voltage setting switching circuit. FIG. 3 is a specific circuit diagram of a current setting switching circuit. FIG. 4 is another specific circuit diagram of the current setting switching circuit. [Description of Signs] 2 Heater 4 Pump 6 Ignition transformer 8 Fan motor 10 Heater control unit 12 Power supply device 14 Internal power supply circuit 16 External power supply circuit 18 Voltage setting switching circuit 20 Current setting switching circuit 22 Input voltage determination circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/24 110 F23Q 7/22 610 G05F 1/56 310 H02J 1/00 304

Claims (1)

(57) [Claim 1] A heater provided with a pump, an ignition transformer, and a fan motor is provided, and a heater control unit for controlling the pump, the ignition transformer, and the fan motor of the heater is provided,
An internal power supply circuit for supplying DC from the built-in storage battery to the heater control unit is provided, and an external DC power input unit and an external AC power input unit are provided, and the DC and external AC power input units input from these external DC power input units are provided. An external power supply circuit that adjusts the DC input and converted to a set voltage and outputs the voltage to the heater control unit via the internal power supply circuit, and sets the DC voltage output from the external power supply circuit to the heater control A voltage setting switching circuit for switching between a set voltage for heater operation and a set voltage for heater stop according to a heater operation signal of the heater, and sets a DC current output from the external power supply circuit to an ignition transformer operation of the heater control unit. A current setting switching circuit for switching between a setting current for operating the ignition transformer and a setting current for stopping the ignition transformer according to a signal; It is determined whether or not the DC voltage input to the power input unit exceeds a set voltage, and if not, the external power supply circuit is bypassed and input to the heater control unit via the internal power supply circuit. A power supply unit for a heater, further comprising an input voltage determination circuit for inputting the voltage to the external power supply circuit and adjusting the voltage to a set voltage when the voltage exceeds the voltage.