JP2016123169A - Power supply device and hot-water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a power supply device capable of suppressing inrush current without a controller including an output terminal dedicated to open/close control of a relay contact.SOLUTION: A power supply device 6 includes: a rectifying/smoothing circuit 62 for rectifying and smoothing supplied AC power to generate DC voltage; a voltage level conversion circuit 63 for converting a voltage level of the generated DC voltage to a predetermined voltage level; and an inrush current prevention circuit 61 that is provided for suppressing inrush current and is constituted by a parallel circuit composed of a resistor TH1 and a normally open relay contact 65a. The power supply device generates, on the basis of a control signal output from a controller 51, power for operating electric equipment; and comprises a relay drive circuit that is provided on the output side from the voltage level conversion circuit and opens/closes the relay contact and a power consumption suppression circuit provided on the output side from the voltage level conversion circuit. The relay drive circuit opens/closes the relay contact in cooperation with the power consumption suppression circuit switching whether or not to suppress power consumption of the electric equipment.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply device and a hot water supply device including the power supply device.

  2. Description of the Related Art Conventionally, an electric device having a built-in power supply device that generates electric power for driving each electrical component is known. In order to suppress the inrush current from the main power source such as a commercial power supply, the power supply device built in the electrical equipment has an inrush current prevention circuit configured by a parallel circuit of a resistor and a relay contact that bypasses the resistor. Some are provided (see, for example, Patent Document 1). In the electric water heater according to Patent Literature 1, the relay contact opening / closing control is performed in accordance with a signal from the control device.

JP 2011-196589 A

  However, the conventional technology as described above has a problem that the control device must be provided with an output terminal dedicated to the switching control in order to perform switching control of the relay contacts.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to control the opening and closing of a relay contact without suppressing the inrush current without providing a control device with an output terminal dedicated to the opening and closing control of the relay contact. An object of the present invention is to provide a power supply apparatus capable of achieving the above and a hot water supply apparatus including the power supply apparatus.

  In order to solve the above-described problems, a power supply device according to the present invention rectifies and smoothes supplied AC power to generate a DC voltage, and a DC generated by the rectifying and smoothing circuit. A voltage level conversion circuit for converting a voltage level to a predetermined voltage level, and a resistor and a normally open relay provided on the input side of the rectification / smoothing circuit to suppress an inrush current generated when the power is turned on An inrush current prevention circuit composed of a parallel circuit with contacts, and a power supply device that generates electric power for operation of electrical components based on a control signal output from the control device, the power level device of the voltage level conversion circuit A relay driving circuit provided on the output side for opening and closing the relay contact, and provided on the output side of the voltage level conversion circuit, depending on whether a predetermined control signal output from the control device is output or not A power consumption suppression circuit that switches whether or not to suppress the power consumption of the electrical component, and in conjunction with switching whether or not to suppress the power consumption of the electrical component by the power consumption suppression circuit The relay drive circuit opens and closes the relay contact.

  Here, the electrical component means an electric device equipped in a product incorporating a power supply device.

  According to the said structure, the inrush current prevention circuit comprised from the parallel circuit of resistance and a normally open type relay contact is provided. Here, since the relay contact is open when the power is turned on, even if an inrush current occurs, the inrush current flows through the resistance side of the inrush current prevention circuit. For this reason, inrush current can be suppressed.

  Also, a relay drive circuit and a power consumption suppression circuit are provided on the output side of the voltage level conversion circuit, and the amount of power consumption of the electrical component is suppressed by the power consumption suppression circuit depending on whether a predetermined control signal is output. Can be switched. Further, in conjunction with this switching, the relay drive circuit can open and close the relay contact. Here, when the power consumption of the electrical component is suppressed by the power consumption suppression circuit, the relay contact opens and the input current flows through the resistance side, but the power consumption of the electrical component is suppressed and the input current Is suppressed compared to the normal time. Therefore, the power consumed by the resistor is acceptable.

  Therefore, the power supply device has an effect of controlling the opening / closing of the relay contact and suppressing the inrush current without the control device having an output terminal dedicated to the switching control of the relay contact.

  Further, in the power supply device according to the present invention, in the configuration described above, as the operation mode, the normal operation operation mode in which the normal operation operation is performed, and the power consumption in the electrical component operated by the operation power are suppressed. The power consumption suppression circuit suppresses the power consumption of the electrical component by receiving an output of a predetermined control signal from the control device or by stopping the received output. Then, it may be configured to switch from the normal operation mode to the power saving mode.

  Further, in the power supply device according to the present invention, in the configuration described above, the power consumption suppression circuit transfers to a predetermined electrical component in response to an output of a first control signal that is a predetermined control signal output from the control device. A voltage cut-off circuit that cuts off the output voltage may be used.

  Further, in the power supply device according to the present invention, in the configuration described above, the power consumption suppression circuit is configured to change to a predetermined electrical component in response to a stop of a second control signal that is a predetermined control signal output from the control device. It may be a constant voltage control circuit that switches the target voltage of the voltage so as to drop the output voltage.

  Moreover, the hot water supply device according to the present invention includes the above-described power supply device. For this reason, the hot water supply device according to the present invention has an effect of controlling the opening and closing of the relay contact and suppressing the inrush current without the control device having an output terminal dedicated to the opening and closing control of the relay contact.

  According to the present invention, the power supply device and the hot water supply device including the power supply device control the opening and closing of the relay contact and suppress the inrush current without the control device having an output terminal dedicated to the opening and closing control of the relay contact. There is an effect that can be.

It is a figure which shows an example of schematic structure of the hot water supply apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the power supply device shown in FIG. FIG. 3 is a circuit diagram illustrating a configuration example of the power supply device illustrated in FIG. 2. 4 is a table showing a correspondence relationship between ON and OFF of a switching element Q2, a second output voltage, and RL1 in the power supply device shown in FIG. It is a circuit diagram which shows the structural example of the power supply device with which the hot water supply apparatus which concerns on the modification 1 of embodiment of this invention is provided. 6 is a table showing a correspondence relationship between ON and OFF states of a switching element Q3, a second output voltage, and RL1 in the power supply device shown in FIG. It is a circuit diagram which shows the structural example of the power supply device with which the hot water supply apparatus which concerns on the modification 2 of embodiment of this invention is provided. It is a table | surface which shows the correspondence of the ON or OFF state of each of transistor Q4, switching element Q5, switching element Q3, and RL1 in the power supply device shown in FIG.

  Hereinafter, a hot water supply device will be described as an example of the electrical apparatus of the present invention, and will be described below with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted.

(Configuration of hot water supply system)
First, with reference to FIG. 1, the principal part structure of the hot water supply apparatus 1 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a diagram illustrating an example of a schematic configuration of a hot water supply apparatus 1 according to an embodiment of the present invention. The hot water supply device 1 is a multifunction hot water supply device having a hot water supply function and a bath retreat function.

  As shown in FIG. 1, the hot water supply device 1 includes a combustion device 2 that burns fuel gas, a fuel gas supply path 21 that supplies fuel gas to the combustion device 2, a blower 22 that supplies air to the combustion device 2, A hot water supply channel 3, a reheating channel 4, a bath water pump 41 provided in the reheating channel 4, and a controller unit 5 are provided. The blower 22 and the bath water pump 41 include a DC motor as a drive unit.

  The combustion device 2 is provided with a burner portion 24, and fuel gas is supplied to the burner portion 24 from the fuel gas supply path 21. The fuel gas supply path 21 is provided with a source gas solenoid valve 25 that switches between supply and cutoff of the fuel gas, and a gas proportional valve 26 that adjusts the supply amount of the fuel gas. Further, the burner unit 24 is provided with a bath gas electromagnetic valve 30, a plurality of hot water supply capacity switching gas electromagnetic valves 28, and a hot water supply gas electromagnetic valve 29.

  The hot water supply flow path 3 exchanges heat between the water supplied from the water supply or the like from the water supply inlet 31 to the hot water supply side heat exchanging section 33 described later, and the combustion gas generated by the combustion device 2. It consists of piping that forms a hot water supply side heat exchange section 33 that heats and a return path section 35 that sends hot water from the hot water supply side heat exchange section 33 to the hot water supply outlet 34. The return path section 35 is provided with a hot water supply amount adjustment valve 36 for adjusting the hot water supply amount and a mixing valve 37 for adjusting the mixing ratio of water and hot water in order to adjust the amount and temperature of the hot water supply. As shown in FIG. 1, the forward path section 32 is provided with a bypass path that branches in the middle of the hot water supply side heat conversion section 33 and is connected to the mixing valve 37. It is configured so that a part of the water flowing in from the water can be guided to the mixing valve 37.

  The reheating channel 4 sends the bath water from the return port 42 to the reheating side heat exchanging unit 44 to be described later, and heats the return water 43 and the bath water by exchanging heat with the combustion gas generated by the combustion device 2. It is composed of a piping that forms a reheating side heat exchanging part 44 and a forward part 46 that sends heated bath water from the reheating side heat exchanging part 44 to the outgoing port 45. The bath water pump 41 is provided in the return portion 43 of the reheating channel 4.

  The controller unit 5 includes a control device 51 and a power supply device 6. The control device 51 includes a CPU, a ROM, a RAM, and the like, and can be realized by an integrated circuit such as a microcontroller. A signal path for controlling each electrical component 7 (see FIG. 2) such as the blower 22 and the bath water pump 41 is connected to the control device 51. In the controller unit 5, the control device 51 can execute various controls of the hot water supply device 1 by, for example, reading a control program stored in the ROM into the RAM and executing it. The control program includes, for example, various programs related to operation control of each electrical component 7.

  The controller unit 5 is supplied with electric power from an unillustrated main power supply (commercial power supply), and the power supply device 6 generates electric power used in the hot water supply device 1. It is converted into a voltage as required by the power supply device 6 and supplied to each electrical component 7 such as the control device 51, the combustion device 2, the blower 22, the bath water pump 41, various electromagnetic valves, and various sensors.

  The hot water supply device 1 having the above-described configuration includes a normal operation mode in which water is heated by heat exchange with the combustion gas generated in the combustion device 2, and standby electric power for a predetermined electrical component 7. It is configured to be able to switch between two operation modes: a power saving mode for performing an operation for suppressing consumption. Details of the power saving mode will be described later.

(Configuration of power supply)
Next, the structure of the power supply device 6 with which the hot water supply apparatus 1 which concerns on embodiment of this invention is provided is demonstrated with reference to FIG. FIG. 2 is a block diagram illustrating a configuration example of the power supply device 6 illustrated in FIG. 1. As shown in FIG. 2, the power supply device 6 includes an inrush current prevention circuit 61, a rectification / smoothing circuit 62, a voltage level conversion circuit 63, and an output circuit 64.

  The inrush current prevention circuit 61 is a circuit that suppresses an inrush current generated when the power is turned on. In the hot water supply device 1, an instantaneous inrush current is generated when the power is turned on, and may flow into the smoothing capacitor C <b> 1 of the rectifying / smoothing circuit 62. Therefore, in order to suppress the influence of the inrush current, the inrush current prevention circuit 61 is provided on the input side of the power supply device 6, more specifically, between the AC power supply and the rectifying / smoothing circuit 62.

  The inrush current prevention circuit 61 is configured by a parallel circuit of a resistor (resistor) TH1 and a relay contact 65a that bypasses the resistor TH1. As the resistor TH1, for example, a resistance element, a thermistor, or the like can be used. When the resistor TH1 is a thermistor, the thermistor is preferably an NTC thermistor whose resistance value decreases as the temperature rises. That is, when the power loss occurs in the thermistor, the resistance value decreases as the temperature rises, so that further power loss can be suppressed.

  Relay contact 65a constitutes relay RL1 together with exciting coil 65b. The relay contact 65a is a so-called normally open contact that is in an open state (non-contact state) when the excitation coil 65b is not energized. In the present embodiment, the exciting coil 65 b is provided in the primary side output circuit 64 a that outputs electric power to the electrical component 7.

  The rectifying / smoothing circuit 62 is a circuit that rectifies the AC voltage received from the main power supply (commercial power supply) and smoothes the fluctuation component (ripple) included in the rectified DC voltage. It is composed of C1. The rectifier circuit 70 is a full-wave rectifier circuit configured by, for example, a diode bridge.

  The voltage level conversion circuit 63 is a circuit that converts the voltage level of the DC voltage rectified and smoothed by the rectification / smoothing circuit 62 into a predetermined voltage level, and is a DC− that uses a so-called transformer (a switching transformer ST1 described later). It is a DC conversion power supply (switching DC power supply). In the voltage level conversion circuit 63, the commercial high voltage side on the primary side and the secondary side voltage supplied to the control device 51, the remote controller and the like are electrically insulated and separated by the switching transformer ST1.

  The voltage converted to a predetermined voltage level by the voltage level conversion circuit 63 is adjusted to a voltage corresponding to each power load by an output circuit 64 provided on the output side of the switching transformer ST1 of the voltage level conversion circuit 63, and output. Is done. Here, as the power load, the electrical components 7 such as the blower 22 and the bath water pump 41 that operate using the voltage output from the primary side output circuit 64a and the voltage output from the secondary side output circuit 64b are used. For example, a remote controller (not shown) that operates by using it. The voltage output from the secondary output circuit 64b is also supplied to the control device 51. As described above, the output circuit 64 includes the primary side output circuit 64a that outputs a voltage to the primary side power load and the secondary side output circuit 64b that outputs a voltage to the secondary side power load. . Hereinafter, the voltage output on the secondary side is referred to as a first output voltage, and the voltage output on the primary side is referred to as a second output voltage.

  The primary side output circuit 64a is provided with a power shut-off circuit 67 as a power consumption suppression circuit, and the bath water pump according to the Low signal of the first control signal output from the control device 51 in the power saving mode. Power supply to 41 and the blower 22 and the like can be cut off, and standby power consumption of the bath water pump 41 and the blower 22 and the like can be suppressed.

  The secondary output circuit 64b is provided with a constant voltage control circuit 68 as a power consumption suppression circuit, and responds to a second control signal (High signal) that stops output from the control device 51 in the power saving mode. Thus, the target voltage of the voltage can be switched so that the voltage output to the predetermined electrical component 7 is lowered. Thereby, it is possible to suppress the standby power consumption of the electrical component 7 that operates using the voltage output from the secondary output circuit 64b in the power saving mode.

  Here, the power saving mode implemented in the hot water supply apparatus 1 according to the embodiment will be specifically described. In the hot water supply device 1, when the control device 51 detects that various operations executed in the normal operation mode are not performed for a predetermined time, the control device 51 determines that the hot water supply device 1 is in the “standby state”. When it is determined that the hot water supply device 1 is in the standby state, the control device 51 outputs a first control signal (Low signal) to the power cutoff circuit 67 provided in the primary side output circuit 64a. In response to the first control signal, the power cut-off circuit 67 cuts off the power supply to the bath water pump 41, the blower 22, and the like. Thereby, in the hot water supply apparatus 1, the consumption of the standby power in the bath water pump 41, the blower 22, and the like can be reduced.

  Moreover, in the hot water supply device 1 according to the embodiment, when the Low signal of the first control signal is output from the control device 51 to the power cut-off circuit 67, the power supply to the bath water pump 41 and the blower 22 is cut off. The At this time, the exciting coil 65b is not energized, and as a result, the relay contact 65a constituting the inrush current preventing circuit 61 is opened.

  Further, when the control device 51 determines that the hot water supply device 1 is in the “standby state”, the control device 51 switches the control target voltage in the constant voltage control circuit 68 by outputting the High signal of the second control signal, and sets the first output voltage. Lower. Thereby, in the hot water supply apparatus 1, it is possible to reduce standby power consumption in the electrical component 7 that is driven using the first output voltage, such as a remote controller (not shown).

(Relay contact open / close)
In the following, in addition to FIG. 2 described above, a circuit configuration relating to the opening and closing of the relay contact 65a will be described with reference to FIG. FIG. 3 is a circuit diagram showing a configuration example of the power supply device 6 shown in FIG.

  As shown in FIG. 3, on the input side of the power supply device 6, the AC voltage of the original power supply (commercial power supply) is converted into DC by a rectifier circuit 70 formed of a diode. A smoothing capacitor C1 is connected between the rectifier circuit 70 and the ground, and the smoothing capacitor C1 smoothes the fluctuation component included in the rectified DC voltage (rectifier / smoothing circuit 62).

  On the input side of the rectifying / smoothing circuit 62, an inrush current preventing circuit 61 configured by a parallel circuit of a resistor TH1 and a relay contact 65a that bypasses the resistor TH1 is provided. Although the relay contact 65a is normally open, when the hot water supply apparatus 1 performs the normal operation mode, the exciting coil 65b is excited and the relay contact 65a is closed. For this reason, even if an inrush current occurs when the power is turned on, the relay contact 65a is in an open state, so the inrush current flows toward the resistor TH1. Thereby, the circuit of the power supply device 6 can be protected from the inrush current. On the other hand, in the normal operation mode, the relay contact 65a is closed, so that a voltage can be output via the relay contact 65a. For this reason, in the normal operation mode, power consumption by the resistor TH1 can be prevented. Details of the opening / closing timing of the relay contact 65a will be described later.

  The voltage level conversion circuit 63 provided in the subsequent stage of the rectifying / smoothing circuit 62 has a flyback type switching circuit configuration in which the primary side and the secondary side are insulated by the switching transformer ST1 as shown in FIG. Yes. The switching transformer ST1 has a first winding P1, a second winding S, and a third winding P2.

  One end of the first winding P1 is connected to the rectifying circuit 70 and the smoothing capacitor C1 constituting the rectifying / smoothing circuit 62, and the other end is connected to the switching element Q1. The switching element Q1 is ON / OFF controlled by an output pulse from a switching control circuit (not shown). The switching element Q1 can be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), for example. Here, an example is shown in which the switching element Q1 is configured by a MOSFET, but the switching element Q1 may be a bipolar transistor or the like. That is, the switching control circuit sets the duty ratio of the control pulse for turning on or off the switching element Q1. The switching control circuit changes the duty ratio based on the feedback voltage applied from the output side of the switching transformer ST1, thereby changing the voltage on the output side of the switching transformer ST1 (the second winding S and the third winding P2). The feedback control is performed so that the voltage becomes a desired voltage.

One end of the second winding S is connected to the first output terminal T _out 1 that outputs the first output voltage via the diode D2 and the smoothing capacitor C4, and the other end is connected to the ground. In the power supply device 6 according to the embodiment, the commercial high voltage generated by the commercial power source is passed through the primary side first winding P1 and the secondary side second winding S of the switching transformer ST1, the diode D2, and the smoothing capacitor C4. A DC voltage stepped down to a predetermined voltage (for example, 15V) is output to the first output terminal T _out 1.

  The third winding P2 has one end connected to the switching element Q1 via the resistor R1, and the other end connected to the switching element Q2 constituting the power cutoff circuit 67 of the secondary output circuit 64b, the diode D1, and the capacitor C3. Connected through. The switching element Q2 may be composed of a MOSFET like the switching element Q1, or may be a bipolar transistor, for example.

  The gate terminal of the switching element Q2 is connected to an output terminal that outputs a High / Low signal of the first control signal of the control device 51 via the photocoupler IC1. The first control signal is a signal for switching ON or OFF of the second output voltage. In the present embodiment, the High signal of the first control signal is in a period during which the second output voltage is turned ON. The voltage is applied from the control device 51 to the gate terminal of the switching element Q2.

The source terminal of the switching element Q2 is connected to the third winding P2, and the drain terminal is connected to the IC 2 that adjusts the voltage of the second output voltage output from the second output terminal T _out 2. IC2 can be, for example, a three-terminal regulator. In addition, a bypass capacitor C2 is provided between the second output terminal _Tout2 and the ground in order to avoid voltage fluctuations when the circuit operates.

In addition, the second output terminal T _out 2 is provided with an exciting coil 65b of the relay RL1 and a resistor R5 that is a current adjusting resistor for energizing the exciting coil 65b, and constitutes a relay driving circuit. ing. When the switching element Q2 is turned on and the second output voltage is output from the second output terminal T _out 2, a current flows through the exciting coil 65b, and the relay contact 65a is closed. Although not particularly shown in FIG. 3, the relay drive circuit further includes a diode for preventing current backflow so as to be connected to the input side and output side of the excitation coil 65b and bypass the excitation coil 65b. It may be.

  Here, the opening / closing timing of the relay contact 65a in the power supply device 6 having the above-described configuration will be described with reference to FIG. FIG. 4 is a table showing a correspondence relationship between ON and OFF of the switching element Q2, the second output voltage, and RL1 in the power supply device 6 shown in FIG.

  As shown in FIG. 4, when the power is turned on, the second output voltage is OFF and no current flows through the exciting coil 65b. Therefore, the relay contact 65a remains open (the relay RL1 is OFF). Further, since the first output voltage does not rise and the first control signal is not output from the control device 51 to the switching element Q2, the switching element Q2 is in an OFF state. Therefore, even if an inrush current occurs when the power is turned on, the inrush current flows toward the resistor TH1. Therefore, the influence of the inrush current can be suppressed in the power supply device 6 and, for example, a protection element such as a fuse can be prevented from being blown.

After the power supply to the hot water supply device 1 is turned on, a first output voltage and a second output voltage are output when a current flows through the power supply device 6. Here, when the first output voltage is output to the control device 51, the control device 51 outputs the High signal of the first control signal to the switching element Q2. When the High signal of the first control signal is applied to the gate terminal of the switching element Q2, the switching element Q2 is turned on. As a result, the second output voltage is output from the second output terminal T _out 2 to the electrical component 7 (second output voltage ON). At this time, a current flows through the exciting coil 65b, and the relay contact 65a is closed (relay RL1 is turned on). Thus, in the normal operation mode after the power is turned on, a current flows through the rectifying / smoothing circuit 62 via the relay contact 65a.

  In the power saving mode, the control device 51 stops outputting the High signal of the first control signal and outputs the Low signal. As a result, the High signal of the first control signal applied to the gate terminal of the switching element Q2 is switched to the Low signal, so that the switching element Q2 is turned OFF and the output of the second output voltage is shut off (the second output voltage Output is OFF). Along with this, the current flowing through the exciting coil 65b is also stopped, and the relay contact 65a is opened (the relay RL1 is turned off).

  As described above, the switching element Q2 provided in the power cutoff circuit 67 switches whether or not to cut off the output of the second output voltage according to the first control signal, and whether or not to energize the relay drive circuit. It can be said that it serves both as a function to switch between.

  Therefore, in the hot water supply device 1 according to the embodiment, the relay contact 65a can be opened when the power is turned on, so that the inrush current generated when the power is turned on can be prevented from flowing into the power supply device 6 as it is. The influence of can be suppressed.

  Further, in the power saving mode in which a large amount of electric power is not required for each electrical component 7, a large current does not flow through the power supply device 6, so that the loss at the resistor TH 1 does not increase even when a current is passed through the resistor TH 1. For this reason, there is no need to close the relay contact 65a (relay RL1 is ON). Therefore, in the power saving mode, power consumption consumed by the relay drive circuit can be suppressed by opening the relay contact 65a without energizing the exciting coil 65b.

  Conversely, in the normal operation mode, power is consumed in each electrical component 7, and thus a large current flows through the power supply device 6. For this reason, in the normal operation mode, the exciting coil 65b can be energized to close the relay contact 65a (the relay RL1 is in the ON state).

  Further, the opening and closing of the relay contact 65a described above can be executed in accordance with a first control signal output from the control device 51, which is a signal for switching the second output voltage ON or OFF. For this reason, in order to perform opening / closing control of the relay contact 65a, the control device 51 does not need to include an output terminal dedicated to opening / closing control.

(Modification 1)
In the power supply device 6 of the hot water supply device 1 according to the above-described embodiment, the relay output circuit provided with the exciting coil 65b in the subsequent stage of the second output terminal T _out 2 in the primary side output circuit 64a is provided. It is not limited to. For example, the relay drive circuit may be provided in the secondary output circuit 64b for the following reason.

  That is, when the operation of the electrical component 7 driven by the first output voltage is stopped, for example, when the electrical component 7 such as the blower 22 driven by the second output voltage is operated in preparation for combustion in the hot water supply device 1. There is. In other words, the load of the first output voltage may be small and the load of the second output voltage may be large. In such a case, the winding voltage of the switching transformer ST1 becomes low due to the regulation.

  Further, when the IC 2 provided in the primary side output circuit 64a is a constant voltage circuit composed of a three-terminal regulator, the difference between the input voltage and the voltage to be output is consumed as heat in the three-terminal regulator. In this way, the voltage is stabilized. For this reason, the relationship between the input voltage and the output voltage must always be higher on the input side by the voltage drop in the three-terminal regulator. Therefore, when the winding voltage of the switching transformer ST1 becomes low, the output voltage from the IC 2 may be smaller than the voltage necessary for operating the blower 22 and the like.

  Therefore, in order to balance the load of the first output voltage and the load of the second output voltage, the relay drive circuit provided in the primary output circuit 64a is moved to the secondary output circuit 64b. It is possible. That is, when the blower 22 and the like are driven by the second output voltage, a current also flows through the excitation coil 65b that constitutes the relay drive circuit, and the relay contact 65a is closed. For this reason, when the blower 22 or the like is driven, a predetermined current (for example, 70 mA) is consumed by the exciting coil 65b in addition to the electrical component 7 such as the blower 22 or the like. Therefore, instead of providing the relay drive circuit having the exciting coil 65b in the primary output circuit 64a, the difference between the load of the first output voltage and the load of the second output voltage is provided in the secondary output circuit 64b. To make it smaller.

  With reference to FIG. 5, the structural example of the power supply device 6 with which the hot water supply apparatus 1 which concerns on the modification 1 of embodiment is provided is demonstrated. FIG. 5 is a circuit diagram illustrating a configuration example of the power supply device 6 included in the hot water supply device 1 according to the first modification of the embodiment of the present invention.

  As shown in FIG. 5, the circuit configuration of the power supply device 6 included in the hot water supply device 1 according to Modification 1 is such that the relay drive circuit provided in the primary output circuit 64 a is provided in the secondary output circuit 64 b. Is different. The rest is the same as the circuit configuration of the power supply device 6 according to the embodiment. For this reason, description of similar components is omitted, and the configuration of the secondary output circuit 64b provided with the relay drive circuit will be described.

  In the power supply device 6 according to the modified example 2, when the relay drive circuit is provided in the secondary output circuit 64b, the relay drive circuit is provided with a switching element Q3 in addition to the excitation coil 65b and the resistor R5. To do. The first control signal output from the control device 51 is branched and applied to the switching element Q3. The switching element Q3 may be composed of a MOSFET as with the switching element Q1, or may be a bipolar transistor, for example.

  That is, the first control signal output from the control device 51 is branched in the middle, and one side is directed to the power cutoff circuit 67 of the primary side output circuit 64a via the photocoupler IC1, and the other side is the secondary side output. In the circuit 64b, it goes to the switching element Q3 provided in the previous stage (inlet side) of the exciting coil 65b. When the High signal of the first control signal is applied to the gate terminal of the switching element Q3, the switching element Q3 is turned on and a current flows through the exciting coil 65b. As a result, the exciting coil 65b is excited and the relay contact 65a is closed.

  Here, the opening / closing timing of the relay contact 65a in the power supply device 6 having the above-described configuration will be described with reference to FIG. FIG. 6 is a table showing the correspondence between the ON or OFF states of the switching element Q3, the second output voltage, and RL1 in the power supply device 6 shown in FIG.

  As shown in FIG. 6, when the power is turned on, the first output voltage and the second output voltage are OFF, and no current flows through the exciting coil 65b. Therefore, the relay contact 65a is open (the relay RL1 is OFF). Remains. Further, since the first output voltage has not risen, the first control signal is not output from the control device 51 to the switching element Q3, so that the switching element Q3 is also turned off.

  For this reason, even if an inrush current occurs when the power is turned on, the inrush current flows toward the resistor TH1. Therefore, the influence of the inrush current can be suppressed and, for example, a protection element such as a fuse can be prevented from being blown.

After the power supply to the hot water supply device 1 is turned on, a first output voltage and a second output voltage are output when a current flows through the power supply device 6. Here, when the first output voltage is output to the control device 51, the control device 51 outputs the High signal of the first control signal to the switching element Q3. When the High signal of the first control signal is applied to the gate terminal of the switching element Q3, the switching element Q3 is turned on. As a result, a current flows through the exciting coil 65b, the relay contact 65a is closed, and the relay RL1 is turned on. Thus, in the normal operation mode after the power is turned on, a current flows through the rectifying / smoothing circuit 62 via the relay contact 65a. Further, the High signal of the first control signal is also applied to the gate terminal of the switching element Q2, and the switching element Q2 is turned on. As a result, the second output voltage is output from the second output terminal T _out 2 to the electrical component 7.

  In the power saving mode, the control device 51 stops outputting the High signal of the first control signal and switches to the Low signal. As a result, the switching element Q3 is turned off. As a result, the current flowing through the exciting coil 65b is also stopped, and the relay contact 65a is opened (the relay RL1 is turned off). In addition, since the High signal of the first control signal applied to the gate terminal of the switching element Q2 is stopped and switched to the Low signal, the output of the second output voltage is cut off.

  As described above, in accordance with the first control signal output from the control device 51, the switching element Q2 provided in the power shutoff circuit 67 has a function of switching whether or not to shut off the second output voltage. It can be said that the switching element Q3 provided in the output circuit 64b has a function of switching whether or not to energize the relay drive circuit.

  As described above, when the winding voltage of the switching transformer ST1 becomes low, a decrease in the winding voltage can be suppressed by moving the exciting coil 65b from the primary side output circuit 64a to the secondary side output circuit 64b. In addition, when the exciting coil 65b is provided in the primary side output circuit 64a, the load on the primary side output circuit 64a increases by the amount of current consumed by the exciting coil 65b. When the temperature increase of IC2 exceeds the reference due to the increase in the load, the excitation coil 65b is moved from the primary side output circuit 64a to the secondary side output circuit 64b to suppress the load on the primary side output circuit 64a. The temperature rise of IC2 can also be suppressed.

  However, in the power supply device 6 according to the modified example 1, since the switching element Q3 is separately required in the secondary output circuit 64b, the circuit configuration is increased accordingly. Therefore, in consideration of the layout of the circuit configuration of the power supply device 6, it is preferable to appropriately determine whether the excitation coil 65b is provided in the primary output circuit 64a or whether the excitation coil 65b is provided in the secondary output circuit 64b.

(Modification 2)
In the hot water supply apparatus 1 according to the above-described embodiment and the hot water supply apparatus 1 according to the first modification of the embodiment, inrush current prevention is performed according to switching between the High signal and the Low signal of the first control signal output from the control device 51. In this configuration, the opening and closing of the relay contact 65a constituting the circuit 61 is controlled. However, the output signal from the control device 51 that can be used for opening / closing control of the relay contact 65a is not limited to the first control signal. Below, the structure which performs the opening / closing control of the relay contact 65a with control signals other than the 1st control signal output from the control apparatus 51 is demonstrated as the modification 2. FIG.

As described above, the power supply device 6 included in the hot water supply device 1 is configured to save power by stopping the output of the second output voltage to the electrical component 7 by the power cut-off circuit 67 in the power saving mode. Further, in the power saving mode, the control target voltage in the constant voltage control circuit 68 can be switched to reduce the first output voltage. That is, when the power saving mode is performed in the operation stop state or standby state of the hot water supply device 1, the first output voltage output from the first output terminal T _out 1 is lowered and the voltage supplied to the electrical component 7 such as a remote controller. The power can be saved by reducing the function of the remote control to stop some functions of the remote control. The voltage drop is executed in accordance with the second control signal output from the control device 51.

  Therefore, the power supply device 6 included in the hot water supply device 1 according to the modified example 2 is configured to open and close the relay contact 65a in response to the output of the High signal or Low signal of the second control signal from the control device 51. . In such a configuration, the relay drive circuit for driving opening and closing of the relay contact 65a is provided in the constant voltage control circuit 68 in the secondary output circuit 64b.

  Hereinafter, with reference to FIG. 7, the structure of the power supply device 6 with which the hot water supply apparatus 1 which concerns on the modification 2 of embodiment is provided is demonstrated. FIG. 7 is a circuit diagram illustrating a configuration example of the power supply device 6 included in the hot water supply device 1 according to Modification 2 of the embodiment of the present invention.

As shown in FIG. 7, the constant voltage control circuit 68 includes a shunt regulator IC3 and voltage dividing resistors R6 to R9 for setting a voltage input to the reference terminal of the shunt regulator IC3 as main parts. The voltage dividing resistors R6 to R9 are provided in series between the power line of the first output terminal T _out 1 and the ground, and are divided by the voltage dividing resistors R6 and R7 and the voltage dividing resistors R8 and R9. The voltage is input to the reference terminal of the shunt regulator IC3.

  A switching element Q5 is connected to both ends of the ground-side voltage dividing resistor R9, and the voltage dividing resistor R9 can be short-circuited by turning on the switching element Q5. In other words, the voltage dividing ratio of the voltage dividing resistor of the shunt regulator IC3 can be changed by short-circuiting the voltage dividing resistor R9, whereby the control target voltage of the shunt regulator IC3 can be switched. Note that the transistor Q4 controlled by the control device 51 is connected to the gate terminal of the switching element Q5 through the capacitor C5, the resistor R12, and the resistor R13, and the switching element Q5 is turned on by turning off the transistor Q4. It is configured.

That is, the control device 51 is connected to the first output terminal T _out 1 and configured to monitor the first output voltage. And it controls so that a 1st output voltage may be switched according to the operation mode (normal operation operation mode and power saving mode) of the hot water supply apparatus 1. Specifically, the control device 51 is connected to the base terminal of the transistor Q4, and by applying the High signal of the second control signal to the transistor Q4, the transistor Q4 is turned on, and the High signal of the second control signal is output. The transistor Q4 is turned off by stopping and switching to the Low signal.

Further, as shown in FIG. 7, voltage dividing resistors R10 and R11 are provided between the power supply line of the first output terminal _Tout1 and the ground, and are switched with the transistor Q4 at a node A between R10 and R11. It is connected to a line connecting the element Q5. Therefore, when the transistor Q4 is OFF, the voltage at the node A divided by the voltage dividing resistor R10 and the voltage dividing resistor R11 is input to the gate terminal of the switching element Q5, and the switching element Q5 is turned ON. On the other hand, when the transistor Q4 is ON, the current goes to the ground through the resistors R12 and R13 and the transistor Q4 via the node A, so that the voltage at the node A decreases and the switching element Q5 is turned OFF.

Here, the control target voltage in the constant voltage control circuit 68 when the voltage dividing resistor R9 is short-circuited by turning on the switching element Q5 is the nominal output voltage of the first output terminal T _out 1 (that is, the normal operation operation mode). 1st output voltage (for example, 15V). On the other hand, the control target voltage when the voltage dividing resistor R9 is not short-circuited (that is, when the switching element Q5 is OFF) is the lower limit of the voltage allowed as the first output voltage of the first output terminal _Tout1 in the power saving mode. Set to a value (eg, 9.2V). Then, the first output voltage is switched between the voltage in the normal operation mode and the voltage in the power saving mode by turning on or off the switching element Q5.

Although not shown in FIG. 7, a photodiode of a photocoupler is connected to the power supply line of the first output terminal T _out 1, and the voltage of the power supply line is converted to a voltage level via this photodiode. The circuit 63 is configured to be fed back to a switching control circuit provided in the circuit 63.

  Here, in the constant voltage control circuit 68 described above, a relay drive circuit including an exciting coil 65b, a resistor R5, and a switching element Q3 is provided between the transistor Q4 and the switching element Q5. When the voltage divided by the voltage dividing resistor R10 and the voltage dividing resistor R11 is input to the gate terminal of the switching element Q5, this voltage is also input to the gate terminal of the switching element Q3. For this reason, the switching element Q3 is also turned on simultaneously with the switching element Q5 being turned on. When the switching element Q3 is turned on, a current flows through the exciting coil 65b via the switching element Q3. Then, the exciting coil 65b is excited and the relay contact 65a is closed (RL1 is in an ON state).

  Here, the opening / closing timing of the relay contact 65a in the power supply device 6 having the above-described configuration will be described with reference to FIG. FIG. 8 is a table showing the correspondence between the ON or OFF states of the transistor Q4, the switching element Q5, the switching element Q3, and RL1 in the power supply device 6 shown in FIG.

  As shown in FIG. 8, when the power is turned on, the first output voltage and the second output voltage are OFF, and no current flows through the exciting coil 65b. Therefore, the relay contact 65a is open (the relay RL1 is OFF). Remains. Further, since the first output voltage has not risen and the second control signal is not output from the control device 51 to the transistor Q4, the transistor Q4, the switching element Q5, and the switching element Q3 are also turned off. For this reason, even if an inrush current occurs when the power is turned on, the inrush current flows toward the resistor TH1. Therefore, the influence of the inrush current can be suppressed and, for example, a protection element such as a fuse can be prevented from being blown.

  After the power supply to the hot water supply device 1 is turned on, a first output voltage and a second output voltage are output when a current flows through the power supply device 6. At this time, since the control device 51 does not output the High signal of the second control signal to the transistor Q4, the transistor Q4 is in the OFF state. Since the transistor Q4 is in the OFF state, the switching element Q5 is in the ON state. At this time, the switching element Q3 is also simultaneously turned on. As a result, a current flows through the exciting coil 65b, the relay contact 65a is closed, and the relay RL1 is turned on. Thus, in the normal operation mode after the power is turned on, a current flows through the rectifying / smoothing circuit 62 via the relay contact 65a.

  When the control device 51 determines that the power saving mode has been switched, the High signal of the second control signal is output to the transistor Q4. As a result, the transistor Q4 is turned on. When the transistor Q4 is turned on, the switching element Q5 is turned off as described above, and the switching element Q3 is also turned off. As a result, the current flowing through the exciting coil 65b is stopped, and the relay contact 65a is opened (relay RL1 is OFF). For this reason, the electric power consumed by the relay drive circuit can be reduced. Further, since the switching element Q5 is turned OFF, the voltage dividing resistor R9 is not short-circuited, and the control target voltage drops from 15V in the normal operation mode to 9.2V. Thereby, power consumption in the power saving mode can be reduced.

  Thus, in response to switching of the High signal or Low signal of the second control signal output from the control device 51, the switching element Q5 switches the control target voltage of the shunt regulator IC3 constituting the constant voltage control circuit 68, It can be said that it bears the function of switching whether or not the voltage of the first output voltage is lowered, and the function of switching whether or not the switching element Q3 provided in parallel with the switching element Q5 is energized to the relay drive circuit.

  As described above, in the power supply device 6 according to the modified example 2, the relay contact 65a can be opened and closed in accordance with switching between the High signal and the Low signal of the second control signal used for instructing the voltage drop. For this reason, the control apparatus 51 can control opening and closing of the relay contact 65a, without providing the output terminal only for switching control of the relay contact 65a. Moreover, since the relay contact 65a is opened when the power is turned on, the inrush current can be suppressed.

  Further, in the power supply device 6 according to the modified example 2, since the opening / closing of the relay contact 65a can be controlled using the input of the High signal or the Low signal of the second control signal, the bath water pump 41 and the blower 22 are controlled. Even if the power supply device 6 according to the embodiment does not include the power cutoff circuit 67, the opening / closing of the relay contact 65a can be controlled.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely used in a hot water supply apparatus having a power saving mode that suppresses consumption of standby power of electrical components.

DESCRIPTION OF SYMBOLS 1 Hot-water supply apparatus 2 Combustion apparatus 3 Hot-water supply flow path 4 Reheating flow path 5 Controller unit 6 Power supply device 7 Electrical component 22 Fan 41 Bath water pump 51 Control apparatus 61 Inrush current prevention circuit 62 Rectification / smoothing circuit 63 Voltage level conversion circuit 64 Output Circuit 64a Primary side output circuit 64b Secondary side output circuit 65a Relay contact 65b Exciting coil 67 Power cut-off circuit 68 Constant voltage control circuit TH1 Resistor T _out 1 First output terminal T _out 2 Second output terminal

Claims (5)

A rectifying / smoothing circuit for rectifying and smoothing supplied AC power and generating a DC voltage; and a voltage level converting circuit for converting a voltage level of the DC voltage generated by the rectifying / smoothing circuit into a predetermined voltage level; An inrush current preventing circuit provided on the input side of the rectifying / smoothing circuit for suppressing an inrush current generated when the power is turned on, and configured by a parallel circuit of a resistor and a normally open relay contact. , A power supply device that generates electric power for operating electrical components based on a control signal output from the control device,
A relay drive circuit provided on the output side of the voltage level conversion circuit, for opening and closing the relay contact;
Power consumption suppression that is provided on the output side of the voltage level conversion circuit and switches whether to suppress the power consumption of the electrical component according to the presence or absence of a predetermined control signal output from the control device A circuit,
A power supply apparatus that causes the relay drive circuit to open and close the relay contact in conjunction with switching whether or not to suppress the power consumption of the electrical component by the power consumption suppression circuit. As the operation mode, at least a normal operation mode that performs a normal operation and a power saving mode that suppresses the amount of power consumed by the electrical component that operates by the operation power,
The power consumption suppression circuit suppresses the power consumption of the electrical component by accepting the output of a predetermined control signal from the control device or by stopping the accepted output, and thereby from the normal operation mode. The power supply device according to claim 1, wherein the power supply device is switched to the power saving mode.   The power consumption suppression circuit is a voltage cut-off circuit that cuts off a voltage output to a predetermined electrical component in response to an output of a first control signal that is a predetermined control signal output from the control device. Or the power supply device of 2.   The power consumption suppression circuit is configured to reduce a voltage output to a predetermined electrical component in response to a stop of a second control signal that is a predetermined control signal output from the control device. The power supply device according to claim 1, wherein the power supply device is a constant voltage control circuit that switches between the two. A hot water supply device comprising the power supply device according to any one of claims 1 to 4.

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