KR20120043484A - Heating pad for toilet seat - Google Patents

Abstract

PURPOSE: A heat generating pad for a toilet seat is provided to pre-heat for certain amount of time when a user gets close and heat when the user sits on the toilet. CONSTITUTION: A heat generating pad for a toilet seat(P) comprises a cover which equips a fixing tool in order to install in toilet, human body sensors which output switching signals for certain amount of time by detecting movement of the user, contact sensors which sense pressure by sitting of the user, a heat generating seat which comprises a first and a second carbon heaters, and a power supply controlling unit(50) which respectively controls supply and cut off of the power according to signals of the switch.

Description

Heating pad for toilet seat {Heating pad for toilet seat}

The present invention relates to a heating pad for the toilet seat, and more specifically, to warm and heat the surface of the toilet seat when the temperature is low, such as in winter to reduce the discomfort and heterogeneity caused by the use of comfort and comfortable to see the toilet The toilet seat cover is a heating pad.

Since the toilet seat of the toilet seat is usually made of synthetic resin material, when the user's skin comes in contact with the user, the user may feel discomfort and heterogeneity due to moisture or coldness. In addition, if the indoor temperature of the toilet is low, the user's body temperature drops sharply and the user feels cold due to the nature of viewing the toilet while lowering pants, underwear or stockings, and in severe cases, may cause various women's diseases. .

Accordingly, the toilet seat heating device and the toilet seat to increase the convenience of use, such as minimizing the discomfort and heterogeneity caused by the cold when the user sits on the toilet seat by providing a heating function by embedding various types of heating elements inside the toilet seat or seat Sheets have been proposed.

For example, Korean Patent Laid-Open Publication No. 10-2004-0012239 discloses a support plate heating device for a toilet seat in which a carbon yarn is sewn in a zigzag form on the bottom of a toilet seat to generate heat when power is applied to both ends of the carbon yarn.

In addition, Korean Patent Laid-Open Publication No. 10-2006-00117734 discloses a toilet seat seat seat which is capable of obtaining heat retention and sterilization by embedding a planar heating element using a conductive carbon paste inside the sheet.

However, such a conventional heating device and sheet has a problem in that unnecessary power was generated by consuming a lot of power even when not in use because it continuously supplies power to maintain a predetermined heating temperature.

In order to solve this problem, a sensor for detecting a user's seat is provided, and a method of heating the toilet seat by operating a heating element as a detection signal transmitted through this is known to be applied to a seat of a bidet, but this is when the user sits on the toilet seat. Due to the characteristic of heating the heating element by detecting the change of force applied to the sensor or the change in capacitance of the sensor, the heating element is not heated when the user is not seated on the toilet seat. There are bound to be limits.

Therefore, the present inventors put emphasis on solving the above-mentioned matters and problems, and when the user approaches a certain distance, only partially preheating is made, and when sitting on the toilet seat, a heating pad for the toilet seat is developed so that the whole heating can be made. While devising the present invention, the present invention was completed.

Therefore, an object of the present invention is to provide a heating pad for the toilet seat to be preheated and heated in stages, and to stop the preheating and heating according to the type of toilet.

Another object of the present invention is to provide a heating pad for the toilet seat to reduce the power consumption in the standby to minimize the waste of power.

The present invention and the cover is provided with a fixing means for mounting on the toilet seat to achieve the above object; A human body sensor mounted on the cover to detect a user's movement and output a signal for a predetermined time; A contact sensor mounted on the cover to sense a pressure according to a user's seating; A heat generating sheet having a first and a second carbon heating element embedded in the cover and arranged adjacent to each other in a specific pattern between upper and lower sheets facing each other and having terminals for connection with a power source at both ends; According to the switching signal of the human body sensor and the contact sensor provides a heating pad for the toilet seat including a power supply control unit for controlling the supply and shutdown of power to the first and second carbon heating element of the heating sheet, respectively.

In another aspect, the present invention provides a heating pad for the toilet seat further includes a position recognition sensor for outputting a switching signal for cutting the power supply to the heating sheet when the toilet seat is mounted in the cover in the vertical direction. do.

In addition, the present invention is mounted on the cover and the heating pad for the toilet seat further comprises a moisture sensor for outputting a switching signal for supplying power to the heat supply sheet when the moisture amount of the cover is detected in a predetermined range or more To provide.

The present invention may further include a temperature sensor mounted on the cover and further including a temperature sensor outputting a switching signal to the power supply controller to cut off power supply to the heating sheet when the temperature of the cover is detected to be higher than a predetermined temperature. Provide pads.

The present invention having the problem solving means and the configuration as described above is pre-heated to a relatively low temperature in the situation before the user sits on the toilet seat by the human body sensor, so when the user sits on the toilet seat to see the toilet, such as cold cold As a result, it is possible not only to feel instant discomfort or heterogeneity, but also to reduce power consumption when waiting for a certain period of time after the operation according to the detection of the human body or when the human body is not re-detected, thereby minimizing power consumption during standby. In addition, when the user sits on the toilet seat in the pre-heating state, the temperature of the toilet seat can be raised in a short time because the entire heating is performed evenly by the operation of the contact sensor.

In addition, according to the present invention, since the pendulum sensor detects this and automatically stops preheating and heating of the heating element in a state in which the toilet seat is lifted, such as when a man urinates, power supply to the heating sheet is cut off to prevent unnecessary power waste. Energy efficiency can be greatly improved by maximizing the power saving effect.

In addition, the present invention, when the moisture sensor detects moisture and humidity above a certain range, automatically supplies power to the heating element and heats it to a predetermined temperature, so that automatic drying and sterilization is possible to promote a more comfortable, comfortable and hygienic use environment. Can be.

1 is a plan view showing a heating pad for the toilet seat according to an embodiment of the present invention,
2 is an enlarged cross-sectional view of the main AA line of FIG.
Figure 3 is a perspective view showing a state in which the heating pad for the toilet seat according to an embodiment of the present invention installed on the toilet seat,
4 is a plan view showing a heating pad for the toilet seat according to another embodiment of the present invention,
5 is an enlarged cross-sectional view of a main portion BB of FIG. 4;

Hereinafter, embodiments according to the present invention will be described more specifically with reference to the accompanying drawings.

Prior to this, the following terms are defined in consideration of the functions in the present invention, which specifies that the concept should be construed as a concept consistent with the technical spirit of the present invention and commonly understood or commonly recognized in the art.

In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

1 is a plan view showing a heating pad for the toilet seat according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view of the main portion AA line of Figure 1, Figure 3 is a perspective view showing a use state in which the heating pad is installed on the toilet seat. 1 to 3, the heating pad P for the toilet seat according to the embodiment of the present invention is largely the cover 10, the human body sensor 20, the contact sensor 30, and the heating sheet 40. ) And a power supply control unit 50 is configured.

First, the cover 10 forms the outer shape of the heating pad (P) and wraps and protects the heating sheet 40, and the user is in contact with the user's skin when seated. It is a material that can stably surround or cover the material such as leather and toilet seat. It is formed in the form corresponding to the toilet seat by sewing, etc., and the side facing the toilet seat TC is quick and easy. In addition, the fixing means 12 is provided with a plurality of fixing means to maintain the mounted state is not easily detached by the external force and can be detachably mounted.

Here, the fixing means 12 can be fixed to the surface of the toilet seat TC and the bottom surface of the cover 10 opposite to each other, while elastically wrapping a Velcro fastener, a permanent magnet, or a toilet seat in which the shape and shape of the male and female correspond to each other. You can use a buckle, elastic band, ties, etc. to keep it fixed.

The human body sensor 20 detects a user's movement and outputs a switching signal to the power supply control unit 50 only for a predetermined time. It detects and checks in real time, and accordingly outputs a switching signal for controlling the power supply and shut-off of the first carbon heating element 43 embedded in the heating sheet to the power supply control unit 50 only for a predetermined time. By automatically adjusting whether the heating element 43 is heated or not, a control function of preheating the heating pad P is performed, and power consumption is minimized by cutting off and reducing power consumption when a human body is not detected, such as during standby. .

The human body sensor 20 stably outputs a signal for preheating the heating pad P when the user approaches a certain distance, and is easily mounted on the cover 10, and there is no contact interference due to use, even when washing. Any material can be applied as long as it is not easily damaged. For example, the presence of an object approaching the detection surface of a switch or an object present in the vicinity of the object detects the sensor while oscillating high frequency waves in the oscillation circuit. Approaching near the surface, the oscillation amplitude of the oscillation circuit is attenuated or stopped.The operating principle that detects the presence or absence of an object by converting this change into an electrical signal is turned on / off when the object comes within a specified sensing distance without mechanical contact. It is possible to apply a switch that emits an off output, and the infrared sensor which detects the infrared wavelength emitted by the human body And magnetic, eddy current, it is also possible to employ a Hall effect, optical, ultrasound, inductive, various types of proximity sensors, such as capacitance performance.

The touch sensor 30 detects physical contact or pressure according to a user's seat and outputs a switching signal to the power supply control unit 50. The touch sensor 30 is mounted at an appropriate position to facilitate surface contact such as the upper surface of the cover 10. It checks whether seating is performed by the load of the user, and accordingly outputs a switching signal for controlling the power supply and shut-off of the second carbon heating element 44 to the power supply control unit 50 of the second carbon heating element 44 By automatically controlling whether the heating is to perform a control function to evenly heat the heating pad (P) as a whole.

Like the above-described human body sensor 20, the touch sensor 30 is easy to be mounted on the cover 10, there is no contact interference due to use, and is not easily damaged even when washing, for example, physical contact The micro switch can be adopted to turn on or off, and the vibration of the upper film (PVDF) is changed when pressure is applied. A piezoelectric polyvinyl fluoride (PVDF) film can also be used.

Here, the contact sensor 30 is more preferably disposed evenly or evenly distributed on the cover 10 so as to effectively detect the user's seat even when the user sits only on a part of the toilet seat TC.

The heating sheet 40 is built in the cover 10 to be generated in a predetermined temperature range by the power supplied from the power supply control unit 50, corresponding to the toilet seat and the cover 10 so that heat can be evenly distributed. The first and second carbon heating elements 43/44 are formed in a shape, and are preferably adjacent to each other in a specific pattern such as a zigzag shape between the upper / lower sheets 41/42 that are coupled to face each other. At each end, a terminal having a function of supplying current is connected to the power supply control unit 50.

In addition, the upper and lower sheets 41 and 42 withstand the high temperature generated from the first and second carbon heating elements 43/44 and the insulation that electrically insulate the first and second carbon heating elements 43/44. It can be formed of glass fibers, synthetic fibers, natural fibers, synthetic leather, natural leather and synthetic resin having a heat resistance that can be.

In addition, the first and second carbon heating elements 43/44 have a constant resistivity and elasticity, and when external power is applied, the first and second carbon heating elements 43/44 can generate high temperature heat while being oxidized due to excellent durability. It is provided that a phenomenon does not occur. For example, a bundle of fine-thick carbon fibers in which conductive carbon black is adhered to a carbon fiber or polyester yarn or cotton yarn by a special method can be formed as one group.

Here, it is preferable that the number of heat wires per installation area is arranged at least multiples of the 2nd carbon heat generating body 44 of the heat generating sheet compared with the 1st carbon heat generating body 43. As shown in FIG.

The heating sheet 40 is arranged between the upper and lower sheets (41/42) and the first and second carbon heating element (43/44) and each terminal to form a predetermined pattern and then fixed by bonding to each other by applying an adhesive can do. At this time, the pressure-sensitive adhesive used is melted when the heat of about 100 ~ 150 ℃ is applied, and if it is dried for about 24 ~ 48 hours between 40 ~ 60 ℃ after processing, that is a gel state that is not completely cured, that is, while maintaining the flexibility and stable The adhesive which has the property to exhibit bonding strength is preferable.

On the other hand, the first and second carbon heating elements 43/44 of the heat generating sheet may be formed of a carbon yarn spirally wrapped around the outer circumferential surface of the screening and generated by electrical properties, and an insulated yarn spirally wrapping the outer circumferential surface of the carbon yarn. . This is because the carbon yarn and the insulated yarn are spirally wound on the outer circumferential surface of the screen to increase the electrical resistance, thereby improving the electrical efficiency, and to secure the flexibility to bend or bend naturally. There is an advantage that can be easily handled as well as improving the quality, such as can be prevented.

In addition, the upper / lower sheet (41/42) of the heat generating sheet may be a heat generating film having a high electrical resistance characteristics and a large amount of infrared radiation is emitted, wherein the first and second carbon heating element (43/44) is carbon The ink mixed with the powder, the adhesive resin, and the curing agent may be formed by printing on one of the upper and lower sheets 41/42 by a silk screen printing method.

The power supply control unit 50 controls supply and shut-off of power to the first and second carbon heating elements 43/44 of the heating sheet according to switching signals for supplying and cutting off power of the sensors, and adjacent to an outlet. It is installed at a certain distance from the cover 10 so that one side is electrically connected to the outlet through a plug or the like, and the other side is electrically connected to the terminals of the first and second carbon heating elements 43/44 to provide a human body monitoring sensor. It supplies and cuts electricity according to the signal of each sensor, and performs functions to control the overall operation such as operating time and temperature and to prevent malfunction through a microprocessor.

Here, the power supply control unit 50 preferably controls the electricity supply so that the heating sheet 40 is maintained at 30 to 40 ℃, provided in the form of a conventional controller for controlling the power supply to the heating sheet 40. Therefore, it can be connected through a medium such as an external power source, an outlet and a plug, and the user can freely adjust the range of the heating temperature step by step by operating a separate temperature selection switch.

The pendulum sensor 60 detects the state of use of the toilet seat TC through a pendulum movement and prevents unnecessary power consumption. When the pendulum sensor TC is mounted in the vertical direction, it is mounted at a place such as the front part of the cover 10. Heating of the first and second carbon heating elements 43/44 by outputting and / or controlling a switching signal for interrupting power supply of the first and second carbon heating elements 43/44 to the power supply control unit 50. It automatically adjusts and controls whether or not.

As the pendulum sensor 60, for example, in a state where the toilet seat TC is set up, the pendulum with a magnet is inclined obliquely, and when the toilet seat TC is horizontally lowered with respect to the upper surface of the toilet for the toilet, the pendulum is itself. As the pendulum motion is restored from the oblique state to the vertical state by the weight of the separate internal sensor and the distance is changed, thereby changing the current can be applied to determine the use form of the toilet seat (TC).

That is, the pendulum sensor 60 may prevent the heating sheet 40 from being preheated and heated unnecessarily by distinguishing a form in which the user looks at the toilet, such as when the toilet seat TC is not used or when a man urinates.

Moisture sensor 70 is to ensure that the heating pad (P) is always in a comfortable and hygienic state, it is mounted in place of the cover 10 to detect the moisture and humidity of the cover 10 in real time to supply power control unit And transmits a signal to the first and second carbon heating elements 43/44 when the power supply control unit 50 compares and judges the predetermined reference humidity and the reference value is greater than or equal to the reference value. If the moisture and humidity contained in the) is detected to be above a predetermined range, it is checked and a switching signal for supplying power to the first and second carbon heating elements 43/44 is output to the power supply control unit 50. And controlling the heating of the first and second carbon heating elements 43/44 automatically.

Here, the heating by the switching signal of the moisture sensor 70 is preferably made of only the second carbon heating element 44 in terms of preventing malfunction.

Like the above-described human body sensor 20, the moisture sensor 70 is easy to be mounted on the cover 10, there is no contact interference due to use, and is not easily damaged during washing, and the amount of water vapor in the cover is measured. And a humidity sensor that detects humidity in the air by color change, ion amount change, electromotive force / current change, and physical quantity change according to relative humidity due to the chemical reaction in the air. Type sensors can be applied.

Temperature sensor 80 is to prevent the heating by detecting the temperature change according to the heat generated by the heat generating sheet 40, it is mounted in place of the cover 10 to sense the overall temperature of the heating pad (P) power supply control Sending a signal to the unit 50 in real time, and compares and determines the power supply control unit 50 with a predetermined reference temperature to block the current to flow to the first and second carbon heating element (43/44) if the reference value or more Alternatively, when the entire temperature of the heating pad P is detected to be higher than or equal to a preset reference temperature, a switching signal for cutting off the power supply of the first and second carbon heating elements 43/44 to the power supply controller 50. By outputting and controlling, the heating temperature of the first and second carbon heating elements 43/44 is automatically adjusted.

Like the above-described human body sensor 20, the temperature sensor 80 is easy to be mounted on the cover 10, there is no contact interference due to use, and is not easily damaged even when washing, it is a sudden change in accordance with the minute temperature change It is possible to apply a contact sensor that measures the temperature value by making direct contact with the measurement object, such as a temperature control sensor that causes a change in resistance or a circuit element having a characteristic of negative resistance temperature coefficient that decreases in resistance when the temperature increases. As temperature increases, PTC which increases the resistance value or NTC which decreases the resistance value may be employed.

On the other hand, each of the above-described sensor is provided with a separate heat insulating material (not shown) on the surface facing the heat generating sheet 40 so as to prevent damage or malfunction due to high temperature heat emitted from the heat generating sheet 40 In addition, between the bottom surface of the heat generating sheet 40 and the inner surface of the cover 10 to prevent the heat generated when the heat generating sheet 40 is leaked toward the toilet bowl to minimize the heat loss by heat radiation Of course, it is possible to additionally install a heat insulating material (not shown).

Referring to the operation and operation of the toilet seat heating pad (P) according to the embodiment of the present invention configured as described above are as follows.

First, if the user is not detected by the human body sensor 20 is automatically switched to the power saving mode to maintain a state in which the electricity consumption is minimized.

When the user approaches the toilet and / or toilet seat TC to view the toilet, the human body sensor 20 detects this and supplies a signal for power supply only for a predetermined time to the first carbon heating element 43 of the heating sheet. Sent to the power supply control unit 50, when the power is applied to the first carbon heating element 43 according to the control signal of the power supply control unit 50 is heated by heat conduction only for a predetermined time to the heating pad (P) Since preheating is made, it is possible to secure ease of use to solve the instantaneous discomfort or discomfort when sitting on the first toilet seat (TC).

When the user sits on the toilet seat TC, the contact sensor 30 detects this and sends a signal for supplying power to the second carbon heating element 44 of the heating sheet to the power supply control unit 50, thereby adjusting the power supply. When power is applied to the second carbon heating element 44 according to the control signal of the unit 50, heat is generated quickly and heat and heat action occurs on the entire heating pad P, so that the toilet can be seen comfortably and comfortably. . At this time, the temperature sensor 80 detects the temperature change according to the heat generated by the first and second carbon heating elements 43/44 in real time to prevent the heating pad P from being heated above the optimum condition. It prevents safety accidents such as fire.

After that, when the user rises after finishing the toilet, the load pressing the contact sensor 30 is naturally removed, and at the same time, the contact sensor 30 controls the power supply to cut off the power supply to the second carbon heating element 44 of the heating sheet. Sending to the unit 50, by which the power supply control unit 50 cuts off the power supplied to the second carbon heating element 44, it is possible to prevent unnecessary power consumption.

If the toilet seat TC is placed in the vertical direction or the user lifts the toilet seat TC to urinate while the user is male, the pendulum sensor 60 detects the first and second carbon heating elements of the heating sheet ( 43/44) sends a signal to cut off the power supply to the power supply control unit 50, according to the control signal of the power supply control unit 50 thereby the heating sheet 40 is not generated heat. At this time, the human body sensor 20 may detect a user and send a signal for supplying power for a predetermined time to the first carbon heating element 43 of the heating sheet to the power supply control unit 50, but the power supply control unit ( 50 may first process the switching signal of the pendulum sensor 60 to control the first carbon heating element 43 of the heating sheet not to generate heat.

In addition, the moisture sensor 70 detects the moisture and humidity of the heating pad P, in particular, the cover 10 in real time, and sends a switching signal to the power supply controller 50 so that the heating pad P is used in an environment or external factors. It prevents it from getting wet or damp so that it is always in a pleasant and hygienic condition.

On the other hand, Figure 4 is a plan view showing a heating pad for the toilet seat according to another embodiment of the present invention, Figure 5 is an enlarged cross-sectional view of the main line BB of Figure 4, as shown in Figure 4 and 5, the present invention Heating pad for the toilet seat (P) according to another embodiment of the pad body 10-1, the human body sensor 20, the contact sensor 30, the heating sheet 40 and the power supply control unit 50 It is configured to include.

In particular, the pad body 10-1 forms and protects the heating sheet 40 while forming the outer shape of the heating pad P '. The pad body 10-1 is in contact with the user's skin when the user is seated. It is formed of materials such as FRP, CFRP, PP, PVC, polyurethane, synthetic resin, etc. with excellent insulation, and corresponding shapes to the toilet seat (TC) by a method such as injection molding, and are formed in a vertically separated or monolithic form.

In addition, the human body sensor 20, the contact sensor 30, the heating sheet 40 and the temperature sensor 80 is mounted in the sensing and heat generating place of the inner space of the pad body 10-1, respectively.

Here, each sensor is provided with a separate heat insulating material (not shown) on the surface facing the heat generating sheet 40 so as to prevent damage or malfunction due to high temperature heat emitted from the heat generating sheet 40. desirable.

In addition, the rear of the pad body (10-1) is integrally formed with a fixing portion 15 for mounting to the toilet bowl, the toilet cover is provided integrally rotatably in a hinged coupling method to the fixing portion (15). One article may be achieved.

In addition, between the bottom surface of the heating sheet 40 and the pad body (10-1) to prevent the heat generated when the heating sheet 40 generates heat to the toilet bowl to prevent the heat loss caused by heat dissipation (not shown) Of course, it can be additionally mounted.

Therefore, the heating pad (P ') for the toilet seat according to another embodiment of the present invention separates the existing toilet seat from the toilet without the need for directly mounting or laying on the toilet seat TC using a separate fixing means as described above. It can be used easily by replacing only the toilet seat or the entire toilet seat including the toilet seat cover.

Here, the same or similar components as the above-described embodiments of the heating pad for the toilet seat according to another embodiment of the present invention use the same reference numerals, and repeated description thereof will be omitted.

On the other hand, the present invention is not limited by the above-described embodiment and the accompanying drawings, and can be changed to other embodiments equivalent to substitutions and equivalents within the scope without departing from the spirit of the present invention is common in the art It will be apparent to those who have knowledge.

10: cover
12: fixing means
20: human body detection sensor
30: contact sensor
40: heating sheet
41: top sheet
42: lower seat
43: first carbon heating element
44: second carbon heating element
50: power supply control unit
60: pendulum sensor
70: moisture sensor
80: temperature sensor
P: heating pad
TC: toilet seat

Claims (6)

A cover provided with fixing means for mounting on the toilet seat;
A human body sensor mounted on the cover to detect a user's movement and output a switching signal for a predetermined time;
A contact sensor mounted on the cover to sense a pressure according to a user's seating;
A heat generating sheet having a first and a second carbon heating element embedded in the cover and arranged adjacent to each other in a specific pattern between upper and lower sheets facing each other and having terminals for connection with a power source at both ends;
A power supply control unit controlling supplying and blocking power to the first and second carbon heating elements of the heating sheet according to the switching signals of the human body sensor and the contact sensor;
Heating pad for toilet seat comprising a.
The method of claim 1,
And a pendulum sensor mounted on the cover, the pendulum sensor outputting a switching signal to the power supply control unit to cut off the power supply to the heating sheet when the toilet seat stands in the vertical direction.
The method according to claim 1 or 2,
And a moisture sensor mounted on the cover and outputting a switching signal for supplying power to the heating sheet to the power supply control unit when the amount of moisture in the cover is detected in a predetermined range or more.
The method according to claim 1 or 2,
And a temperature sensor mounted on the cover and outputting a switching signal to the power supply controller to cut off the power supply to the heating sheet when the temperature of the cover is detected to be higher than a predetermined temperature.
A pad body formed of a toilet seat shape;
A human body sensor mounted on the pad body and detecting a user's movement and outputting a switching signal for a predetermined time;
A contact sensor mounted on the pad body to sense a pressure according to a user's seating;
A heating sheet having first and second carbon heating elements embedded in the pad body and arranged adjacent to each other in a specific pattern between upper and lower sheets facing each other and having terminals for connection to a power source at both ends;
A power supply control unit controlling supplying and blocking power to the first and second carbon heating elements of the heating sheet according to the switching signals of the human body sensor and the contact sensor;
Heating pad for toilet seat comprising a.
The method of claim 5, wherein
The pendulum sensor outputs a switching signal to cut off the power supply to the heating sheet when the toilet seat is mounted in the pad body in the vertical direction and when the temperature of the pad body is detected above a predetermined temperature. The heating pad for the toilet seat further comprises a temperature sensor for outputting a switching signal for cutting the power supply to the seat to the power supply control unit.

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