JP2019088916A - Hand dryer - Google Patents

Abstract

To provide a hand dryer whose power consumption is low on standby.SOLUTION: A hand dryer comprises an air blower comprising a motor for blowing air to a hand insertion part, a hand detection sensor for detecting a hand in the hand insertion part, and a control circuit for controlling operation of the motor depending on detection of the hand detection sensor. The control circuit comprises a rectification smoothing circuit for converting AC power inputted from the outside into high-voltage DC power, a switching regulator for converting the high-voltage DC power converted by the rectification smoothing circuit into first low-voltage DC power, and voltage stabilization means for stabilizing voltage of the first low-voltage DC power. The low-voltage DC power having the voltage stabilized by the voltage stabilization means is used as power for the hand detection sensor.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a circuit for suppressing power consumption during standby of a hand dryer that dries wet hands.

DESCRIPTION OF RELATED ART Conventionally, the hand drier which dries a hand by applying a warm hand air or high speed air to the wet hand is known. For example, JP-A-7-79881 discloses a hand dryer including a fan, a DC brushless motor for driving the fan, and a controller, wherein the DC brushless motor is a synchronous motor having a permanent magnet type rotor, and a transistor. It has a commutator and a control IC, and the control IC and controller are connected to a low voltage DC power supply for control, the controller outputs a control signal to the control IC, and the transistor commutator operates under the control of the control IC There is disclosed a hand dryer which operates a DC brushless motor to blow warm air from an air outlet and dry the hand.
Further, JP-A-2-83487 includes a fan motor driven at 100 V AC, a control circuit for driving the fan motor, a power supply unit, and a step-down circuit for supplying driving power to the control circuit. The hand dryer is a step-down circuit that steps down the voltage of AC 100 V with the transformer of the power supply unit and then reduces the voltage by the step-down circuit and rectifies the DC drive power supply to the control circuit, and based on the signal of the control circuit A hand dryer is disclosed that operates to supply AC 100 V to a fan motor to drive the fan motor to blow warm air from the outlet.
Further, as a power supply device of an electronic device for reducing power consumption at the time of standby in Japanese Patent Application Laid-Open No. 2001-169552, a main power supply unit to which an AC power supply is input and a second power supply unit sequentially have a predetermined capacity. Rectifying means for rectifying a voltage dividing means in which a first capacitor, a second capacitor and a third capacitor are connected in series, and a terminal diode of a second capacitor constituting the voltage dividing means by a rectifier diode connected in a bridge type And a standby power supply unit supplied with a DC voltage rectified by the rectification unit, and switching for controlling the AC power supply supplied to the main power supply unit by a control signal output from the control circuit driven by the standby power supply unit. A power supply device comprising: means is disclosed.

JP-A-7-79881 (paragraphs "0006" to "0007", Figs. 1 and 2) JP-A-2-83487 (lower page 2 to upper page 3, FIG. 3) JP 2001-169552 A (claims 1, 4 and 1)

However, in the hand dryer disclosed in Japanese Patent Laid-Open No. 7-79881, since a direct current motor driven by a DC power source is used, energization of each phase winding of the stator of the direct current motor (synchronous motor) is required. A control IC for controlling the switching transistor commutator and the transistor commutator is required, and the control IC is always energized so that the DC motor can be driven to blow out air from the air outlet as soon as the user puts a hand Since it is in the standby state, there is a problem that power is always consumed even when the DC motor is stopped.
Further, in the hand dryer disclosed in Japanese Patent Laid-Open No. 2-83487, since an AC motor driven at AC 100 V is used, a control IC for switching energization of each phase winding of the stator is unnecessary. However, there is a problem that the transformer always consumes a large amount of power because the power supply circuit steps down using the transformer.

  Also, even if the technique of the power supply device of the electronic device for reducing power consumption at the time of standby disclosed in Japanese Patent Application Laid-Open No. 2001-169552 is applied to a hand dryer, the wiring of the power supply wiring of the facility where the hand dryer is installed Since the situation differs depending on the installation facility, the voltage drop in the power supply wiring is large in equipment with high input power (power consumption) such as hand dryer and large current consumption, and the difference in power supply wiring situation in the facility is a significant difference in voltage drop As a result, the voltage input to the voltage dividing capacitor may vary depending on the installation location. In addition, variations in the voltage division ratio also occur due to variations in the capacitance of the voltage dividing capacitor itself. As a result, there is a problem that the voltage input to the voltage regulator of the standby power supply unit is varied and unstable.

  In addition, under the current situation where commercial AC power supplies of countries in the world are largely different from country to country in the range of AC85V to AC265V, in the step-down method using capacitor voltage division, the voltage generated is largely changed by the input voltage Therefore, there is also a problem that a power supply device in which a capacitor voltage division ratio is set specifically for each country is required.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a hand dryer with low standby power consumption.

  The hand drier according to the present invention includes a blower having a motor for blowing air to the hand insertion portion, a hand detection sensor for detecting a hand of the hand insertion portion, and an operation of the motor according to the detection of the hand detection sensor. A hand dryer comprising: a control circuit for controlling, the control circuit comprising: a rectifying and smoothing circuit for converting an AC power source input from the outside into a high voltage DC power source; and a high voltage DC power source converted by the rectifying and smoothing circuit And a voltage regulator for stabilizing the voltage of the first low-voltage DC power supply, and the low-voltage DC power supply whose voltage is stabilized by the voltage stabilization means is It is used as a power source of the detection sensor.

  The hand dryer according to the present invention can reduce power consumption during standby.

It is a perspective view which shows the external appearance of the hand dryer which concerns on Embodiment 1 of this invention. It is side surface sectional drawing of the hand dryer which concerns on Embodiment 1 of this invention. It is a perspective view which shows the external appearance of the state which opened the cover 16 of the hand dryer which concerns on Embodiment 1 of this invention. It is a circuit block configuration of the hand dryer according to Embodiment 1 of the present invention. It is explanatory drawing explaining the light emission timing of the infrared rays of the hand detection sensor 106 of the hand dryer which concerns on Embodiment 1 of this invention. It is a circuit block configuration of the hand dryer according to Embodiment 2 of the present invention. It is a circuit block configuration of the hand dryer according to Embodiment 3 of the present invention.

Embodiment 1
FIG. 1 is a perspective view showing the appearance of the hand dryer according to Embodiment 1 of the present invention, FIG. 2 is a side sectional view, and FIG. 3 is a perspective view showing the appearance of the hand dryer with the cover 16 opened. . As shown in FIG. 1 and FIG. 2, the casing 1 forming the outer shell of the hand dryer has a hand insertion port 2 on the front and is provided with a hand insertion portion 3 as a processing space following the hand insertion port 2 It is made to be able to insert and remove. The hand insertion portion 3 is formed in the front lower portion of the casing 1 as an open sink-like concave portion in which the front surface and both side surfaces are open, and the water receiving portion 4 forming the lower portion and the curved surface configuration at its back edge The anti-barrier structure 5 is provided by the rise of the water so as to prevent the water from scattering to the side or the front. The bottom of the water receiving portion 4 is inclined downward toward the front, and a drain 6 is provided at the lower end of the inclined portion. Below the water receiving portion 4, a drain container 7 for storing water dropped from the drainage port 6 is detachably provided. In addition, the inner surface of the manual insertion portion 3 is impregnated with a water repellent coating such as silicon or fluorine, a coating having hydrophilicity such as titanium oxide, or an antibacterial agent to reduce adhesion of dirt to the inner surface, or , To reduce the breeding of bacteria. A nozzle 12 for blowing high-speed air downward toward the hand insertion part 3 is provided at the upper part of the hand insertion part 3.

  An AC motor (AC motor) 9a, which is a commutator motor, is disposed in a box-like space formed of the casing 1 and the base 8 that forms the outer shell of the hand dryer on the back side above the hand insertion portion 3; High-pressure air flow generator 9, which is a blower including a turbo fan 9b fixed to the rotation shaft of AC motor 9a and rotated, and an intake port 18 provided on the intake side of high-pressure air flow generator 9 and the side of casing 1 And an exhaust passage 13 communicating the exhaust side of the high pressure air flow generator 9 with the nozzle 12. A heater 111 is provided near the upstream side of the nozzle 12 in the middle of the exhaust passage 13 for heating the air sent from the high-pressure air flow generating device 9 to warm it. Inside the casing 1 on the rear side of the nozzle 12, a circuit board 114b provided with a hand detection sensor 106 and an illumination LED 128 is provided. The light emission direction and the light reception direction of the hand detection sensor 106 and the light emission direction of the illumination LED 128 are both directed toward the hand insertion portion 3 and visible light or light provided in a part of the casing 1 on the upper surface of the hand insertion portion 3 The hand detection sensor 106 detects the presence or absence of the hand of the hand insertion unit 3 through the light transmitting window 1a that transmits infrared light, and the illumination LED 128 as illumination means illuminates the hand insertion unit 3 and makes it bright.

  In the vicinity of the front face of the casing 1, inside the casing 1, a control circuit 150, an energizing LED 129 as a display means for energizing indicating that power is supplied and is being energized in a standby state, and an LED 128 for illumination A circuit board 114 a is provided with a changeover switch 130 as a switching means capable of independently switching ON / OFF of the lighting of the energizing LED 129. The light emission direction of the energization display LED 129 and the operation surface of the changeover switch 130 are provided toward the front side. The changeover switch 130 is, for example, a dip switch.

  Further, as shown in FIG. 3, openings 1 b and 1 c are partially provided in the vicinity of the energizing LED 129 and the changeover switch 130 in the front of the casing 1 so as to face the openings 1 b and 1 c. Since the energizing LED 129 and the changeover switch 130 are provided, the light of the energizing LED 129 can be visually recognized from the outside of the casing 1, and the changeover switch 130 can be operated from the outside of the casing 1. Since switching on / off of the illumination LED 128 and the energizing LED 129 can be independently selected by switching the changeover switch 130, the power is turned on by selecting the illumination LED 128 with the changeover switch 130. When the illumination LED 128 is turned on and the illumination LED 128 is turned off by the changeover switch 130, the illumination LED 128 remains turned off without being turned on even when the power is turned on. Similarly, if the lighting of the energizing LED 129 is selected by the changeover switch 130, the energizing LED 129 is turned on when the power is turned on, and if the lighting of the energizing LED 129 is selected by the changeover switch 130, the electricity is turned on even when the power is turned on. The LED 129 remains off without being lit.

  Further, on the outside of the front of the casing 1, a power switch 21 is provided as a main power switch that switches ON / OFF the connection between the external commercial AC power supply and the control circuit 150. Further, the front side of the casing 1 is covered with the upper part of the hand insertion portion 3 and the front side of the casing 1 is covered to form an outer shell of the hand dryer, and the left end is rotatably supported by the casing 1 A cover 16 which can be opened and closed and which can be detached from the casing 1 is attached to the front side. A light transmitting window 16 a is provided on the cover 16 so that the light of the energizing LED 129 can be viewed from the outside of the cover 16.

  Next, the operation at the time of use in which the hands are dried will be described. When the cover 16 is opened and the power switch 21 is turned on (ON), the external commercial AC power supply is energized to the control circuit 150, and the cover 16 is closed to be in a usable state where hand drying is possible (hereinafter referred to as standby state) . When the AC power supply is energized in the control circuit 150, the illumination LED 128 is turned on when the switching of the illumination LED 128 of the changeover switch 130 is ON, and the switching of the energization LED 129 of the changeover switch 130 is ON. The energizing LED 129 lights up. Then, when the user puts the wet hand into the hand insertion part 3 from the hand insertion opening 2 to the vicinity of the wrist, the hand detection sensor 106 detects the insertion of the hand and the control circuit 150 activates the high pressure air flow generating device 9 Do.

  When the high pressure air flow generator 9 operates, air outside the hand dryer is drawn from the air inlets 18 provided on both sides of the casing 1. The air taken in from the air inlet 18 passes through the air intake passage 11, passes above the high pressure air flow generator 9, travels backward, moves downward, and is drawn from the suction side of the high pressure air flow generator 9 . The high pressure air flow generator 9 converts the air sucked from the intake side into high pressure air from the exhaust side and exhausts it, and the exhausted high pressure air passes through the exhaust air passage 13 from the nozzle 12 into a high speed air flow having high kinetic energy. It is converted and blown downward into the hand insertion unit 3. The high-speed air flow blown out from the nozzle 12 contacts the wet hand inserted in the hand insertion part 3, and the moisture adhering to the hand can be peeled off from the surface of the hand and blown off to dry the hand. Furthermore, by moving the hand in the hand insertion portion 3, all the water droplets adhering to the entire hand are eliminated, and the hand is subjected to a drying process. When the heater switch (not shown) provided in the casing 1 is turned on, the heater 111 is energized and the high pressure air passing through the exhaust air passage 13 is heated. It can be blown out and used without feeling of cold wind even in winter.

  After the hand is dried, when the hand is pulled out of the hand insertion unit 3, the hand detection sensor 106 detects that the hand has been pulled out, and the high-pressure air flow generation device 9 is stopped. The water droplets blown off from the hand flow down toward the drainage port 6 in the water receiving unit 4 of the forward tilt structure, and are accommodated in the drainage container 7 from the drainage port 6.

  Next, details of the control circuit 150 will be described. FIG. 4 is a circuit block configuration of the hand dryer according to the first embodiment of the present invention. In the following description, although the case where the external commercial AC power supply 100 is AC 230 V will be described, as long as it is a commercial AC power supply used in the world, the external commercial AC power supply 100 may be AC 100 V, AC 200 V, etc. For example, the voltage is not limited to 230 V AC.

  As shown in FIG. 4, the control circuit 150 connected to the external AC 230 V commercial AC power supply 100 is connected to the inrush protection circuit 101 for suppressing the rush current at the time of power on and the output side of the rush protection circuit 101. Rectifying and smoothing circuit 102 for converting AC 230 V AC power input from the outside into DC 322 V high voltage DC power supply, and DC 322 V high voltage DC power supply connected to rectifying and smoothing circuit 102 and converted by rectifying and smoothing circuit 102 to low voltage DC power supply Of the isolated type, a motor drive circuit 110 using a triac to drive the AC motor 9a of the high-pressure air flow generator 9, a heater drive circuit 109 for controlling energization to the heater 111, and hand detection The motor drive circuit 110 and the heater drive circuit 109 operate in response to the signal from the sensor 106 Other comprises a microcomputer 107 for outputting a command for stopping. The AC motor 9a of the high pressure air flow generator 9 is a motor operated by a single phase AC power supply, and is a commutator motor capable of high speed rotation. When high speed rotation is not required, an induction motor operated by single-phase AC power supply may be used, or an induction motor driven by three-phase AC power supply may be used.

  The low voltage DC power supply converted by the switching regulator 103 is used as a power supply of the microcomputer 107, the hand detection sensor 106, the heater drive circuit 109, and the motor drive circuit 110. When the hand detection sensor 106 detects the presence of a hand, the microcomputer 107 outputs an operation command to the motor drive circuit 110 to operate the AC motor 9a of the high-pressure air flow generator 9 connected to the motor drive circuit 110. When the presence of the hand is not detected by the detection sensor 106, the microcomputer 107 outputs a stop command to the motor drive circuit 110 to stop the AC motor 9a.

  Further details will be described. The power supply circuit is an isolated flyback converter. Between the AC 230 V external commercial AC power supply 100 and the rush protection circuit 101, a current fuse (not shown) for protecting the control circuit 150 is generally provided. The rectifying and smoothing circuit 102 is composed of a diode bridge (not shown) and an electrolytic capacitor (not shown), full-wave rectifies AC 230 V AC power with a diode bridge (not shown) and converts it to DC. It is smoothed by a capacitor (not shown) to generate a high voltage DC power supply of DC 322 V. Because of the capacitor input type power supply circuit configuration, a rush current (charging current) flows to the electrolytic capacitor (not shown) when the power is turned on, and between the diode bridge (not shown) and the rush protection circuit 101 and the commercial AC power supply 100 Since there is a risk of damaging the provided current fuse (not shown), a rush protection circuit 101 is provided for the purpose of suppressing the rush current.

The switching regulator 103 is composed of a switching power supply IC (not shown) and a switching transformer (not shown), and is of an isolated type. A high-voltage DC power supply of DC 322 V generated by conversion by the rectifying and smoothing circuit 102 is input to the switching regulator 103. In the switching regulator 103, high-speed switching of 100 kHz is performed by a power MOSFET (field effect transistor) (not shown) incorporated in the switching power supply IC (not shown). In the switching transformer (not shown), the input and output are insulated, and the power MOSFET built in the switching power supply IC (not shown) is turned on to make magnetic energy to the primary coil of the switching transformer (not shown) Then, the power MOSFET built in the switching power supply IC (not shown) is turned off to output the energy to the secondary side of the switching transformer. The switching transformer (not shown) is a two-output type, and on the secondary side, a low voltage DC power supply of DC12V and DC5V is generated by being isolated from a high voltage DC power supply of DC322V. The DC5V generated by step-down by the switching regulator 103 is used as a power source for the microcomputer 107 and the hand detection sensor 106. The DC12V is a phototriac (not shown) of the motor drive circuit 110 and a phototriac of the heater drive circuit 109 (FIG. Not used for power supply). Since DC12V and DC5V generated by the switching regulator 103 are insulated, there is a risk of an electric shock even if the water seal function is broken by the changeover switch 130 or the heater switch (not shown) that can perform switching operation from the outside of the casing 1 Absent.
Note that the switching regulator 103 is a non-insulation type in which the primary side and the secondary side are not insulated unless there is a risk of electric shock with a changeover switch 130 or a heater switch (not shown) that can switch from outside the casing 1. The voltage value of the low voltage DC power supply generated by the switching regulator 103 may be appropriately set according to the characteristics of the microcomputer 107 and the hand detection sensor 106 to be used.

  The AC motor 9a is driven by energizing AC 230 V of the commercial AC power supply 100, and the motor drive circuit 110 is mainly composed of a triac (not shown) and a photo triac (not shown), and the hand detection sensor 106 When a hand is detected, the microcomputer 107 outputs a Hi signal to a photo triac (not shown) and the photo triac (not shown) is turned on to become a trigger signal for the triac (not shown), and the triac (not shown). ) Is turned on, and AC 230 V is supplied to the AC motor 9a.

  Similarly, the heater drive circuit 109 is mainly composed of a triac (not shown) and a photo triac (not shown), and the heater switch (not shown) of the heater 111 provided in the casing 1 is in the ON state. Only when the hand detection sensor 106 detects a hand, the microcomputer 107 outputs a Hi signal to a photo triac (not shown), and the photo triac (not shown) is turned on to trigger the triac (not shown). As a signal, a triac (not shown) is turned on to energize the heater 230 with AC 230 V.

  Further, the rush protection circuit 101 is configured by a fixed resistor (not shown), and aims to suppress a rush current flowing to an electrolytic capacitor (not shown) of the rectifying and smoothing circuit 102 when the power is turned on. The rush protection circuit 101 may be configured by an NTC thermistor. Further, the current value suppressed by the rush protection circuit 101 is the surge current tolerance of the diode bridge (not shown) of the rectifying and smoothing circuit 102 and the protection of the control circuit 150 provided between the external commercial power supply 100 and the rush protection circuit 101. It is determined by the rush current withstand capacity of the current fuse (not shown) for this purpose, or the current withstand capacity of the power switch 21 provided externally, and these parts have sufficiently high rush current withstand capacity and it is necessary to suppress the rush current at power on. If there is not, the rush protection circuit 101 may be omitted.

  Next, the light emission timing of the hand detection sensor 106, the display LED 128, and the energizing LED 129 will be described. FIG. 5 is an explanatory view for explaining an infrared light emission timing of the hand detection sensor 106 of the hand dryer according to the first embodiment of the present invention. The hand detection sensor 106 is configured by a pair of a light emitting element (not shown) that emits infrared light and a light receiving element (not shown) that receives infrared light emitted from the light emitting element. A light receiving element (not shown) is provided on the circuit board 114b. As shown in FIG. 5, the infrared light emission of the light emitting element (not shown) is turned on for 20 ms with 100 ms as one cycle, and the remaining 80 ms is turned off, regardless of the standby state or operating state of the hand dryer. The hand detection sensor 106 is always pulsed. Further, since the pulse drive is performed to the extent that the display LED 128 and the energizing LED 129 do not feel flickering, the average current flowing to the illumination LED 128 and the energizing LED 129 is reduced, which leads to the reduction of power consumption.

  Although the circuit board 114a and the circuit board 114b are separately provided in the present embodiment and connected to each other by a plurality of lead wires, the control circuit is divided into three or more pieces and the lead wires are shown. It may be connected in one circuit board by changing the arrangement position of LED128 for lighting, LED129 for electricity supply, hand detection sensor 106, and changeover switch 130.

  In the power saving of the hand dryer having more standby time than the usage time, it is a matter of course to reduce the power consumption during the operation of driving the high-pressure air flow generator 9, but to reduce the power consumption at the standby time. Things are also very important. In such a hand dryer, according to the above configuration, the high-pressure air flow generating device 9 for blowing air to the hand insertion portion 3 is constituted by the AC motor 9a, and a low-voltage DC power supply is generated by the rectifying and smoothing circuit 102 and the switching regulator 103. Since it is generating, it is unnecessary to use an inverter circuit for switching the energization of each phase winding of the stator like a direct current motor or a control IC for switching each switching element of the inverter circuit. As soon as a hand is detected, the control IC is always energized to consume power without being able to consume power during standby so that the high-pressure air flow generator 9 can be operated immediately. 107, the motor drive circuit 110 and the hand detection sensor 106. Since the low-voltage DC power supply of is generated, it is possible to reduce the power loss at the time of generation compared to the generation of a low-voltage power supply with a conventional transformer, so the power consumption at the time of use is reduced as well as at the time of use. You can get a hand dryer.

  In addition, since an auxiliary power supply circuit including a voltage dividing capacitor or a relay is not necessary, voltage drop in the power supply wiring causes variations in the voltage supplied to the voltage dividing capacitor depending on the power supply wiring condition of the installation facility. There is no case that the voltage input to the voltage regulator of the part is not stable, and the voltage balance is broken due to the electrostatic capacitance variation of the voltage dividing capacitor itself, so the voltage dividing ratio is not stable. In addition, since the TRIAC is used without using a relay, there is no concern about the life associated with the repetition of the ON-OFF operation, even with a device such as a hand dryer that repeats the standby state and the operating state frequently. In addition, there is no increase in substrate size or cost for a voltage dividing capacitor or relay.

  Further, since the step-down is performed by using the switching regulator 103, the same control circuit can be used for the input voltage from AC85V to AC265V, and it is possible to widely cope with commercial AC power supplies different in countries of the world.

  In addition, since the illumination LED 128 for illuminating the hand insertion portion 3 is provided, and the changeover switch 130 such as a dip switch capable of arbitrarily switching ON / OFF of lighting of the illumination LED 128 from the outside is provided, the installation location is always In the case of an installation environment where the illumination of the hand insertion part 3 is unnecessary in a bright place, etc., the switch 130 can be turned OFF to always turn off the illumination LED 128 according to the installation environment. It can be reduced.

  Similarly, a changeover switch 130 such as a dip switch is provided which is provided with an energizing LED 129 that lights up when energized and represents the energized state, and can switch ON-OFF of lighting up when energized for that energizing LED 129 from outside. Since it is provided, when it is desired to reduce the power consumption, particularly in the standby mode, the switch 130 can be turned off to turn off the energizing LED 129 all the time, and in particular to reduce the standby mode power consumption. it can.

  In addition, since the DC 12 V and DC 5 V generated by the switching regulator 103 are insulated from the high voltage DC power supply 322 V using the insulating switching regulator 103, the switch 130 or the heater switch (switching operation can be performed from the outside of the casing 1) There is no risk of electric shock even if the water seal function is broken due to (not shown).

Second Embodiment
FIG. 6 is a circuit block configuration of a hand dryer according to Embodiment 2 of the present invention. The difference from the first embodiment is that the DC 5 V power source used in the microcomputer 107 and the hand detection sensor 106 is configured by the series regulator 104, and the other parts are the same as or similar to those in the first embodiment And a detailed explanation is omitted. In FIG. 6, a general three-terminal regulator or a low saturation regulator IC (LDO: Low Drop Out) is used as the series regulator 104, and the loss due to the series regulator 104 can be further reduced by using an LDO. The switching regulator 103 generates a low-voltage DC power of 12 V DC, inputs the 12-V DC power supply to the three-terminal regulator constituting the series regulator 104, and further steps down the three-terminal regulator to generate a low-voltage DC power of 5 V DC. The output voltage generated by the series regulator 104 may be set in accordance with the characteristics of the microcomputer 107 and the hand detection sensor 106 to be used.

  According to the above configuration, the same effects as those of the first embodiment can be obtained, and the voltage accuracy of the low voltage DC power supply can be improved by using the series regulator 104, and the voltage accuracy of the microcomputer 107 and the hand detection sensor 106 can be improved. Can provide a stable high voltage DC power supply. In addition, the use of a low saturation regulator IC (LDO) can further reduce power consumption during standby.

Third Embodiment
FIG. 7 is a circuit block configuration of a hand dryer according to Embodiment 3 of the present invention. The difference from the first embodiment is that a power factor improvement circuit 120 is added between the rectifying and smoothing circuit 102 and the switching regulator 103, and the other configuration is the same as or similar to that of the first embodiment and the same. It attaches a code | symbol and abbreviate | omits detailed description. In FIG. 7, a power factor correction circuit 120 is provided between the rectifying and smoothing circuit 102 and the switching regulator 103. Since the switching regulator 103 is equipped with a capacitor input type rectifying and smoothing circuit, the input current does not become a sine wave, and the peak current becomes high and current harmonics are generated. The generation of harmonics is a factor to increase power supply infrastructure equipment and energy consumption, and harmonic reduction is important for improving the efficiency of the power supply. What is needed for harmonic reduction is power factor correction (PFC) that brings the input current close to a sine wave. Since the peak of the harmonic current can be lowered, the load on the power plant can be reduced and a high energy saving effect can be expected. The PFC circuit is classified into an active type that performs high-speed switching using a power semiconductor and a passive type configured with a capacitor and a reactor, and either one may be selected according to the cost and the size according to the device to be used.

  According to the above configuration, since the power factor improvement circuit is provided with the same effect as the first embodiment, it is possible to lower the peak of the harmonic current, and the energy saving effect by the load reduction of the power plant is expected. it can.

DESCRIPTION OF SYMBOLS 1 Casing 1a Translucent window 1b Opening part 1c Opening part 2 Hand insertion port 3 Hand insertion part 4 Water receiving part 5 Barrier structure 6 Drainage port 7 Drain container 8 Base 9 High pressure air flow generating device (fan)
9a AC motor 9b Turbo fan 11 intake passage 12 nozzle 13 exhaust passage 16 cover 16a translucent window 18 intake port 21 power switch 100 commercial AC power supply 101 rush protection circuit 102 rectification smoothing circuit 103 switching regulator 104 series regulator 106 hand detection sensor 107 microcomputer 109 Heater drive circuit 110 Motor drive circuit 111 Heater 114a Control board 114b Control board 120 Power factor improvement circuit 128 LED for illumination (illumination means)
129 LED for energization (energization display means)
130 Switch (switching means)
150 control circuit

Claims (4)

A blower having a motor for blowing air to a hand insertion portion, a hand detection sensor for detecting a hand of the hand insertion portion, and a control circuit for controlling the operation of the motor according to the detection of the hand detection sensor Hand dryer,
The control circuit includes a rectifying and smoothing circuit that converts an AC power source input from the outside into a high voltage DC power source;
A switching regulator for converting the high voltage DC power supply converted by the rectifying and smoothing circuit into a first low voltage DC power supply;
Voltage stabilizing means for stabilizing the voltage of the first low voltage DC power supply;
Equipped with
A hand dryer using a low voltage DC power supply whose voltage is stabilized by the voltage stabilization means as a power supply of the hand detection sensor. The control circuit includes a microcomputer that outputs a command for operating or stopping the motor according to the detection state of the hand detection sensor.
The hand dryer according to claim 1, wherein a low voltage DC power supply whose voltage is stabilized is used as a power supply of the hand detection sensor and the microcomputer. The control circuit includes a motor drive circuit that operates the motor according to a command from the microcomputer,
The hand dryer according to claim 2, wherein the first low-voltage DC power supply is used as a power supply of the motor drive circuit. The hand dryer according to any one of claims 1 to 3, wherein the motor is an AC motor operated by an AC power supply.

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