JP2000333861A - Power source circuit for jet bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shut off the power source circuit of a DC motor and an AC power source line immediately when there is a shorting fault of the DC motor by shutting off the AC power source line by activating a circuit breaker, thereby stopping the DC motor in case pump voltage falls down to reference voltage or below. SOLUTION: If the shorting of a coil of the DC motor 5 occurs at the time of current supply to a DC pump 5, overcurrent flows instantaneously to the DC motor 5 but the switching operation is instantaneously stopped by an overcurrent protection circuit 25 disposed at a switching power source 2 and, therefore, the voltage impressed to the DC motor 5 turns to 0. Then, the voltage drop is detected by a pump voltage drop detecting circuit 35 and the signal of the motor voltage zero is sent to a shutting section 63 of the circuit breaker 6, by which the power source circuit 10 and the AC power source line are shut off and the supply of the current to the DC motor 5 may be stopped. Since both are shut off immediately without the continuation of the operation until abnormality occurs and, therefore, safety is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for a jet bath for supplying a driving current to a DC pump for pumping pressurized bath water together with air into a bathtub.

[0002]

2. Description of the Related Art In recent years, a bubble jet generating mechanism for circulating water in a bathtub, forcing the bathwater into the bathtub together with air, and for feeding a jet stream containing air bubbles into the bathtub has been widely used. ing. This is achieved by accelerating the circulating water using a drive pump (hereinafter referred to as a DC pump) 5 installed in a circulating water path 12 of a bathtub 11 and driven by a DC motor, as shown in FIG. The air sent from 13 is mixed with the accelerated bath water and injected into the bathtub 11 as a bubble jet from the injection port of the jet valve 14. By hitting this bubble jet on a predetermined part of the body,
It is said that an appropriate acupressure interval can be obtained and a feeling of fatigue can be reduced.

FIG. 4 is a schematic block diagram showing an example of a configuration of a jet bath power supply circuit 10A which is a drive circuit of the DC pump 5. The jet bath power supply circuit 10A
A power supply switch 1 connected to an AC power supply line via an earth leakage breaker 6, a switching power supply 2 for outputting a predetermined DC voltage, and a current supplied to the DC pump 5 according to ON / OFF of a bubble jet generating switch 3S. And a control circuit 3 having a relay 3R for supplying or shutting off. The earth leakage breaker 6 includes a detection unit 61 that outputs an earth leakage signal by detecting earth leakage of an AC power supply line, a test unit 62 that is activated by an earth leakage check switch 64 and outputs a test signal, And a power cutoff unit 63 that cuts off the AC power supply line by inputting a signal, and cuts off the AC power supply line at the time of leakage of the AC power supply line or at the time of a leakage test.

Next, the jet bath power supply circuit 10A
Will be described. When the bubble generation switch 3S is turned on while the power switch 1 is turned on, the contact of the relay 3R of the control circuit 3 is connected, and the switching power supply 2
, A predetermined drive voltage is applied to the DC pump 5, and the DC pump 5 is driven to pressurize the bath water in the circulating water path 12. The pressurized bath water is supplied to the air introduction pipe 13 in the jet valve 14.
From the jet valve 14 and jetted into the bathtub 11 as a jet stream (bubble jet) accompanied by bubbles (bubbles). Further, when the bubble generation switch 3S is turned off, the contact of the relay 3R of the control circuit 3 is opened, the current supply to the DC pump 5 is stopped, and the jet flow is stopped. Further, regardless of whether the DC pump 5 is operating or not, the earth leakage breaker 6 immediately shuts off the AC power line when the earth leakage of the AC power line is detected, and a device (hereafter) of the earth leakage breaker 6 is provided. Then, the connection between the input line of the jet bath power supply circuit 10) and the AC power supply line is cut off.

[0005]

However, the earth leakage breaker 6 has only a function of interrupting the supply of AC power to the jet bus power supply circuit 10A only when the earth leakage of the AC power supply line occurs. Therefore, a means for detecting an abnormality of the jet bath power supply circuit 10A such as an overturn of the apparatus, an abnormality of the bath water temperature, or an abnormal current of the DC motor, and a safety device for disconnecting the connection with the AC power supply line are provided. There has been proposed a method of interrupting connection to an AC power supply line when an abnormality is detected (Japanese Patent Laid-Open No. 5-212222). Although the abnormal current of the DC motor is not described in detail in the above publication, it is considered that the abnormal current indicates a current value equal to or higher than a standard value due to an increase in load due to entry of foreign matter into the circulation path or the like. Can be However, in the above-described conventional example, no measures have been taken against a short-circuit failure of the DC motor 5 which causes an abnormality of the jet bath power supply circuit 10A. The circuit 10A has a problem that the operation is continued until some abnormality occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and is intended for a jet bus capable of immediately cutting off the power supply circuit of a DC motor and an AC power supply line when a short-circuit failure of the DC motor occurs. It is an object to provide a power supply circuit.

[0007]

According to a first aspect of the present invention, there is provided a jet bath power supply circuit for controlling a voltage applied to a DC pump for driving a bubble jet for carrying bath water together with air into a water tank and a predetermined reference voltage. A means for comparing is provided, and when the pump voltage becomes equal to or lower than the reference voltage, an earth leakage breaker provided between an AC power supply line and an input portion of a switching power supply is operated to cut off the AC power supply line. Thus, the DC motor is stopped.

According to a second aspect of the present invention, there is provided a power supply circuit for a jet bus, wherein an overcurrent protection circuit is provided in the switching power supply, and when an overcurrent flows through the DC pump, the switching operation is stopped. .

According to a third aspect of the present invention, there is provided a jet bath power supply circuit, wherein the switching power supply is a two-output power supply for outputting two different voltages, and a pump strength switching circuit is provided to reduce the ejection pressure of the bubble jet. It can be switched.

[0010] The power supply circuit for a jet bath according to claim 4 is provided with means for detecting a water level in the bathtub and means for detecting rotation of the DC pump, and when the DC pump is idling, the DC pump is provided. A pump idling prevention circuit for stopping the current supply to the motor is provided.

According to a fifth aspect of the present invention, there is provided a jet bath power supply circuit, wherein pump current detecting means for detecting a current flowing through the DC pump is provided, and rotation of the DC pump is detected by the pump current detecting means. Things.

According to a twelfth aspect of the present invention, a power supply circuit for a jet bath uses a relay to turn on and off a current supplied to a DC pump, and performs a series of operations for connecting and opening or opening or releasing and connecting the contacts of an input switch. A switch unit for connecting or disconnecting the relay when the switch is turned on.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a jet bus power supply circuit 10 according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an AC power supply line (household power supply; AC 100 V) via the following earth leakage breaker 6. A power switch 2 connected to the power supply, a switching power supply for converting an input AC voltage into a predetermined DC voltage and outputting the DC voltage;
3 is a relay 3 for supplying or interrupting current to the DC pump 5
This is a control circuit provided with R. The earth leakage breaker 6 detects an earth leakage of the AC power supply line and outputs an earth leakage signal.
A power supply circuit for a jet bus, comprising: a test section 62 that outputs a test signal by being activated by a leakage check switch 64; and a power cutoff section 63 that cuts off the AC power line by inputting the leak signal or the test signal. 10
And the AC power supply line.

The switching power supply 2 is a well-known DC-DC
The converter type switching power supply rectifies the AC voltage input on the primary side 2A, generates a pulse of a predetermined chopping frequency (for example, 20 kHz) by the switching circuit 22, and converts the pulse to a predetermined voltage by the high frequency transformer 23. The voltage is stepped down, transferred to the secondary side 2B, converted into a desired DC voltage by the constant voltage control circuit 24, and output. The overcurrent protection circuit 25 is provided on the primary side 2A, acts on the switching circuit 22 when an abnormal current flows through the switching circuit 22, and stops the switching operation. Acts on the switching circuit 22 when an overvoltage occurs,
This is an overvoltage protection circuit that stops the switching operation.

The control circuit 3 includes a remote control switch input circuit 31 for inputting a bubble generation signal and a bubble stop signal from the remote control switch 7, and a relay 3R. Based on the signal from the remote control switch input circuit 31, the relay 3R A pump output on / off circuit 32 for supplying or stopping the current to the DC pump 5 by connecting or disconnecting the contacts of the above, and a predetermined time (for example, 15 minutes) from the occurrence of a bubble.
Has elapsed, the pump output on / off circuit 3
2, a timer circuit 33 for outputting a signal for shutting off the contact point of the relay 3R, and a circuit provided between the output side of the switching power supply 2 and the pump output on / off circuit 32. A pump current detecting circuit 34 for detecting a value of the pump voltage and a pump for detecting a voltage supplied to the DC pump 5 and comparing the detected pump voltage with a preset reference voltage to detect a drop in the pump voltage. A voltage drop detection circuit 35 is provided to open or close the relay 3R of the pump output on / off circuit 32 in response to the bubble generation signal or the bubble stop signal to supply or stop the current to the DC pump 5. Reference numeral 36 indicates whether the DC pump 5 is running idle based on the output of the water level sensor 8 mounted inside the bathtub (not shown) or the DC pump 5 or the detected current value from the pump current detection circuit 34. When the DC pump 5 is idling, a pump idling prevention circuit for controlling the pump output on / off circuit 32 to stop the DC pump. This is a pump strength switching circuit that outputs a voltage switching signal for switching the voltage value applied to the DC pump 5 to the constant voltage control circuit 24 of the switching power supply 2 based on the voltage.

When the drop in the voltage applied to the DC pump 5 is detected by the pump voltage drop detection circuit 35 of the control circuit 3, a motor failure signal is sent to the cut-off section 63 of the leakage breaker 6, so that the leakage is detected. Activate breaker 6,
The power supply circuit 10 and the AC power supply line are cut off.

The remote controller switch input circuit 31 sets or resets the flip-flop 3F for setting or resetting the timer circuit 33, and sets or resets the flip-flop 3F when a series of operations of connecting and opening contacts are performed. An input switch 3Z is provided to operate the timer circuit 33 in response to a bubble generation signal or a bubble stop signal from the remote control switch 7 to connect or open the relay 3R.

Next, the operation of the jet bus power supply circuit 10 having the above configuration will be described with reference to the time chart of FIG. At the time t with the power switch 1 turned on,
_In FIG. 2, when a bubble generation signal is input by the remote control switch 7, in the remote control switch input circuit 31, as shown in FIG. 2A, the input switch 3Z connects the contact (time t ₁ ) and opens (time t ₁ ). After a series of operations at t ₂ ), the flip-flop 3F is set as shown in FIG. This set signal, as shown in FIG. 2 (c), along with the timer circuit 33 timer is set to a period T _0, the connection instruction signal is sent to the pump output on and off circuit 32, FIG. 2 (d) As shown in FIG. 2, the relay 3R is connected, and as shown in FIG. 2E, a pump current flows, and the DC pump 5 is driven to pressurize bath water in a circulating water path (not shown).

Here, when a bubble stop signal is input from time t ₂ at time t ₃ when a period T ₁ shorter than the timer set period T ₀ has elapsed, the connection and opening of the contact of the input switch 3Z are opened. after a series of operations, the flip-flop 3F is reset at time t _4, the timer is reset. At this time, an opening command signal is sent from the timer circuit 33 to the pump output on / off circuit 32, the relay 3R is opened, the supply of the pump current is stopped, and the DC pump 5 is stopped. In addition, the bubble generation signal is input at time t _5,
At time t ₆ , the timer is set to period T ₀ , and if no bubble stop signal is input during the period of T ₀ , time t ₇ = t ₆ +
At T ₀ , the timer stops, and the timer circuit 33 sends a time-up signal (opening command signal) connection command signal to the pump output on / off circuit 32. As a result, the relay 3R is opened, the supply of the pump current is stopped, and the DC pump 5
Stops.

In the above-mentioned normal operation, the pump idling prevention circuit 36 detects whether the water level sensor 8 detects that the water level in the bathtub is low or the pump current detection circuit 34 detects that the pump current has decreased. , DC pump 5
Is determined to be idling, and the pump output on / off circuit 3
By sending a pump stop signal to the DC pump 2, the DC pump 5 is stopped to prevent the pump from running idle. When the jet flow strength switching signal is input to the strength switching circuit 35, the strength switching circuit 35 controls the constant voltage control circuit 24 of the switching power supply 2 to switch the voltage value applied to the DC pump 5. This switches the strength of the jet stream injected into the bathtub.

Here, when the current is supplied to the DC pump 5,
When the coil of the DC motor 5 is short-circuited, an overcurrent flows into the DC motor 5 instantaneously, but the switching operation is instantaneously stopped by the overcurrent protection circuit 25 provided in the switching power supply 2. , The voltage applied to the DC motor 5 becomes zero. Therefore, the above-mentioned voltage drop is detected by the pump voltage drop detection circuit 35, and the 0 signal (failure signal) of the motor voltage is supplied to the cut-off section 63 of the earth leakage breaker 6.
, The power supply circuit 10 and the AC power supply line are cut off, and the supply of current to the DC motor 5 can be stopped. If the power supply circuit 10 and the AC power supply line are not interrupted, the switching power supply 2 operates again,
The operation in which an overcurrent flows in the DC motor 5 and the stop of the switching operation by the overcurrent protection circuit 25 are repeated, which may cause a failure of the switching power supply 2 itself.

As described above, in the present embodiment, the pump voltage drop detection circuit 35 is provided, and when the voltage applied to the DC pump 5 becomes lower than the reference voltage, the earth leakage breaker 6 is operated, and the power supply circuit 10 And the AC power supply line, and when a short circuit fault occurs in the DC motor 5, the power supply circuit 10 and the AC power supply line are immediately disconnected without continuing the operation until an abnormality occurs. Therefore, the safety of the power supply circuit 10 can be improved.

[0023]

As described above, according to the first aspect of the present invention, the voltage applied to the DC pump that drives the bubble jet that conveys bath water together with air to the water tank and the predetermined reference voltage are determined. A means for comparing is provided, and when the pump voltage becomes equal to or lower than the reference voltage, an earth leakage breaker provided between an AC power supply line and an input portion of a switching power supply is operated to cut off the AC power supply line. Thus, when the coil of the DC motor is short-circuited, the power supply circuit and the AC power supply line can be immediately cut off, and the safety of the power supply circuit can be improved.

According to the second aspect of the present invention, since an overcurrent protection circuit is provided in the switching power supply, when an overcurrent flows in the DC pump, the switching operation is stopped and each of the switching power supplies is stopped. The element can be protected.

According to the third aspect of the present invention, the switching power supply outputs two different voltages from each other.
In addition to providing an output power source, a pump strength switching circuit is provided, so that the ejection pressure of the bubble jet can be switched as needed, and a suitable finger pressure can be obtained.

According to the fourth aspect of the present invention, a means for detecting the water level of the bathtub and a means for detecting the rotation of the DC pump are provided. Since the pump idling prevention circuit for stopping the current supply is provided, unnecessary pump rotation can be avoided.

According to the fifth aspect of the present invention, the pump current detecting means for detecting the current flowing through the DC pump is provided, and the rotation of the DC pump is detected by the pump current detecting means. The rotation of the DC pump can be detected with a simple configuration.

According to the sixth aspect of the present invention, when a current supplied to the DC pump is turned on / off by a relay and a series of operations of connection and opening or opening and connection of a contact of an input switch are performed. Is provided with a switch unit to connect or open the relay, so that even if the contacts of the input switch are always in contact, the bubble generation signal is not continuously output, and the temperature of the DC motor rises. Unnecessary failure due to the above can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a jet bus power supply circuit according to an embodiment of the present invention.

FIG. 2 is a time chart for explaining an operation of the jet bath power supply circuit according to the embodiment of the present invention.

FIG. 3 is a diagram showing an outline of a jet bath.

FIG. 4 is a diagram showing a configuration of a conventional jet bus power supply circuit.

[Explanation of symbols]

Reference Signs List 1 power switch, 2 switching power supply, 2A primary side of switching power supply, 2B secondary side of switching power supply, 3 control circuit, 3R relay, 5 DC pump, 6
Earth leakage breaker, 7 remote control switch, 8 water level sensor, 10 jet bath power supply circuit, 22 switching circuit, 23 high frequency transformer, 24 constant voltage control circuit, 25 overcurrent protection circuit, 26 overvoltage protection circuit, 3
1 Remote control switch input circuit, 32 pump output on / off circuit, 33 timer circuit, 34 pump current detection circuit, 35 pump voltage drop detection circuit, 36 pump idling prevention circuit, 37 pump strength switching circuit, 61 detection section, 62 test section , 63 power cut-off section, 64 switch for leakage detection.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (6)

[Claims] A switching power supply connected to the AC power supply line via a leakage breaker for detecting a leakage of the AC power supply line and shutting off the power supply line, and outputting a predetermined DC voltage; In a jet bath power supply circuit for supplying a current to a DC pump for driving a bubble jet conveyed with air, a power supply circuit for a jet bath includes means for comparing a voltage applied to the DC pump with a predetermined reference voltage, wherein the pump voltage is A power supply circuit for a jet bus, wherein when the voltage becomes equal to or lower than the reference voltage, the earth leakage breaker is operated to cut off the AC power supply line. 2. The jet bus power supply according to claim 1, wherein an overcurrent protection circuit is provided in the switching power supply, and the switching operation is stopped when an overcurrent flows in the DC pump. circuit. 3. The switching power supply according to claim 2, wherein the switching power supplies are different from each other.
2. The jet bath power supply circuit according to claim 1, wherein a two-output power supply for outputting two voltages and a pump strength switching circuit are provided so that the ejection pressure of the bubble jet can be switched. 4. A pump idling prevention circuit for providing a means for detecting a water level in a bathtub and a means for detecting rotation of a DC pump, and stopping a current supply to the DC pump when the DC pump is idling. The power supply circuit for a jet bath according to claim 1, further comprising: 5. The jet according to claim 5, further comprising pump current detecting means for detecting a current flowing through said DC pump, and detecting rotation of said DC pump by said pump current detecting means. Power supply circuit for bus. 6. A relay for turning on and off the current supplied to the DC pump and connecting or opening the relay when a series of operations of connecting and opening or opening and connecting and connecting the contacts of the input switch are performed. The jet bus power supply circuit according to claim 1, further comprising a switch unit.