Faucet device

Abstract

To prevent enlargement of a circuit and to suppress deterioration of usability of a user.SOLUTION: A faucet device according to an embodiment includes at least three or more water discharge parts for discharging water into a bathroom, an electric load for switching between water discharge and water stop of the water discharge parts, and an overcurrent protection circuit capable of cutting off energization to the electric load when an overcurrent flows from a power supply to the electric load. The overcurrent protection circuit includes a first overcurrent protection circuit connected to an electrical load corresponding to one of the water dischargers, and a second overcurrent protection circuit connected to an electrical load corresponding to the other of the water dischargers.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The disclosed embodiments relate to a water faucet device. [Background technology]

[0002] In a water faucet device in which multiple electromagnetic on-off valves (solenoid valves) are installed in the hot and cold water flow path, the solenoid valves are opened and closed by operating a switch installed in a separate location to switch the hot and cold water outlet. Furthermore, when multiple electrical loads such as solenoid valves and motors are installed in such a water faucet device configuration, it is known to install individual overcurrent protection circuits for each electrical load to suppress the impact of an overcurrent on the electrical load (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-157088 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional configurations, the need to provide an overcurrent protection circuit for each electrical load increases the size of the circuit, which can adversely affect the design of the shelf, making it difficult for users to use, for example, if the control unit for the faucet device is stored on a shelf in the bathroom.

[0005] One aspect of the embodiment has been made in consideration of the above, and aims to provide a faucet device that can prevent the circuit from becoming larger and suppress deterioration in usability for the user. [Means for solving the problem]

[0006] A faucet device according to one aspect of the embodiment is a faucet device comprising at least three or more water outlets that discharge water into a bathroom, an electrical load that switches the water discharge from the water outlets on and off, and an overcurrent protection circuit that can cut off the flow of electricity to the electrical loads when an overcurrent flows from a power source to the electrical loads.The overcurrent protection circuit comprises a first overcurrent protection circuit connected to an electrical load corresponding to one of the water outlets, and a second overcurrent protection circuit connected to an electrical load corresponding to the other water outlet.

[0007] Compared to when an overcurrent protection circuit is installed for each electrical load, the faucet device can reduce the circuit size related to overcurrent protection. Furthermore, compared to when all overcurrent protection circuits are combined into one, at least one water outlet can continue to be used even if one of the electrical loads fails due to an overcurrent. In other words, it is possible to achieve both a smaller circuit size and ease of use for the user.

[0008] The three or more water dischargers include at least a faucet and a hand shower, and an electrical load corresponding to either the faucet or the hand shower is connected to the first overcurrent protection circuit.

[0009] By separating the faucet and hand shower and combining the overcurrent protection circuits, the faucet device allows the user to continue using either the faucet or the hand shower, whichever is more frequently used, even if the electrical load breaks down due to an overcurrent, thereby improving usability for the user.

[0010] Additionally, an electrical load corresponding to the hand shower is connected to the first overcurrent protection circuit.

[0011] In the event that the solenoid valve corresponding to the other water discharge portion fails, the faucet device allows the user to continue using the hand shower, which is the most convenient for handling, thereby improving usability for the user.

[0012] The other water outlet has an overhead shower or a water outlet that discharges cold water from within the faucet body.

[0013] The faucet device can consolidate overcurrent protection circuits for water discharge parts that are used in different situations and discharge water from different locations, making it easier for users to notice failures in the electrical load and improving usability.

[0014] The faucet further includes a hot and cold water mixing section that mixes the hot and cold water to be supplied to the water discharge section, a flow rate adjustment section that adjusts the flow rate of the hot and cold water to be supplied to the water discharge section, a first motor that operates the hot and cold water mixing section, and a second motor that operates the flow rate adjustment section, and the overcurrent protection circuit has a third overcurrent protection circuit connected to the first motor and a fourth overcurrent protection circuit connected to the second motor.

[0015] In the faucet device, the overcurrent protection circuit related to the hot and cold water mixing section and the flow rate adjustment section is separate from the overcurrent protection circuit related to the water discharge section, so when one water discharge function is used continuously, temperature and flow rate adjustments can also be made continuously, making it easier for users to use. [Effects of the Invention]

[0016] According to one aspect of the embodiment, it is possible to prevent the circuit from becoming large in size and suppress deterioration of usability for the user. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic diagram showing an example of a bathroom unit in which a water faucet device according to an embodiment is installed. [Figure 2] FIG. 2 is a front view of the remote controller according to the embodiment. [Figure 3] FIG. 3 is a block diagram showing an outline of the water faucet device according to the embodiment. [Figure 4] FIG. 4 is a perspective view of the faucet body. [Figure 5] FIG. 5 is a perspective view of the mixer faucet unit. [Figure 6] FIG. 6 is a cross-sectional perspective view taken along line VI-VI shown in FIG. [Figure 7]FIG. 7 is a flowchart showing the procedure of the temperature adjustment control. [Figure 8] FIG. 8 is a block diagram showing the configuration of the overcurrent protection of the water faucet device according to the embodiment. [Figure 9] FIG. 9 is a block diagram showing the configuration of the overcurrent protection of the water faucet device according to the embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of an overcurrent protection circuit. [Figure 11] FIG. 11 is a diagram showing the circuit configuration of the water faucet device according to the embodiment. [Figure 12] FIG. 12 is a diagram showing the circuit configuration of the water faucet device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] A faucet device 1 according to the embodiment is provided, for example, in a bathroom unit 10 as shown in Figure 1. Figure 1 is a schematic diagram showing an example of a bathroom unit 10 in which a faucet device 1 according to the embodiment is provided.

[0019] In a Cartesian coordinate system, the positive direction of the X-axis is defined as "left" and the negative direction of the X-axis is defined as "right." In addition, the Cartesian coordinate system defines the positive direction of the Y-axis as "backward" and the negative direction of the Y-axis as "forward." In addition, the Cartesian coordinate system defines the positive direction of the Z-axis as "upward" and the negative direction of the Z-axis as "downward." For this reason, in the following description, the X-axis direction may be referred to as the left-right direction, the Y-axis direction as the front-back direction, and the Z-axis direction as the up-down direction.

[0020] Bathroom unit 10 includes bathtub 11, first counter 12, second counter 13, and faucet device 1. In the following, when there is no need to distinguish between water discharged by faucet device 1, hot water, and mixed hot and cold water discharged by faucet device 1, they will be referred to as "hot and cold water."

[0021] The first counter 12 is attached to the wall portion 14a of the bathroom unit 10. The first counter 12 protrudes from the wall portion 14a into the bathroom. The first counter 12 is provided above the washing area floor 15 of the bathroom unit 10. The first counter 12 houses the faucet body 3 of the faucet device 1. A hot water waiting outlet 25a is provided at the lower end of the first counter 12. The hot water waiting outlet 25a is provided on the first counter 12 so that the hot water is discharged downward.

[0022] The second counter 13 is attached to the wall portion 14a. The second counter 13 protrudes from the wall portion 14a into the bathroom. The second counter 13 is provided higher than the first counter 12. For example, the second counter 13 is provided so as to extend above the bathtub 11. However, the second counter 13 does not have to extend above the bathtub 11.

[0023] The second counter 13 houses a portion of the faucet device 1. Specifically, the second counter 13 houses a portion of the faucet 21 of the faucet device 1 and a portion of the hand shower 22 of the faucet device 1. The second counter 13 is provided with the spout 21a of the faucet 21 exposed. The spout 21a of the faucet 21 is provided on the second counter 13 so that the direction of hot and cold water spouting is downward.

[0024] In addition, a shower hose 22a of a hand shower 22 of the faucet device 1 is connected to the second counter 13. The shower hose 22a is connected to a shower water conduit housed in the second counter 13.

[0025] An overhead shower 23 of the faucet device 1 and a warm pillar 24 of the faucet device 1 are attached to the ceiling 16 of the bathroom unit 10. The overhead shower 23 and the warm pillar 24 are provided integrally.

[0026] The overhead shower 23 sprays hot water over a wider area of ​​the user than the hand shower 22. For example, the overhead shower 23 is configured so that hot water hits the entire body of the user. The warm pillar 24 collects hot water into a single stream and sprays it straight. In other words, the warm pillar 24 sprays straightened hot water so that it flows down in a continuous column.

[0027] Remote control 4 (operating unit) for faucet device 1 is attached to wall portion 14b of bathroom unit 10. Remote control 4 may be attached to wall portion 14a to which first counter 12 and second counter 13 are attached.

[0028] The remote control 4 accepts various operations by the user on the faucet main body 3. Specifically, the remote control 4 accepts operations to set the hot and cold water temperature (set temperature) in the faucet main body 3. The remote control 4 accepts operations to set the hot and cold water flow rate in the faucet main body 3. The remote control 4 accepts operations to switch between discharging hot and cold water and stopping the water. The remote control 4 accepts operations to switch the hot and cold water discharge destination. The remote control 4 has a sound output unit and outputs sound. When operated by the user, the remote control 4 transmits an operation signal corresponding to each operation to the control device 7 of the faucet device 1 (see Figure 3).

[0029] 2, the remote control 4 includes, for example, a temperature adjustment button 41, a water volume adjustment button 42, and a switching button 43. Fig. 2 is a front view of the remote control 4 according to the embodiment.

[0030] The temperature adjustment button 41 is a button for adjusting the temperature of the mixed hot water in the faucet main body 3. The temperature adjustment button 41 includes a high temperature button 41a and a low temperature button 41b. The high temperature button 41a is a button for increasing the temperature of the mixed hot water. The low temperature button 41b is a button for decreasing the temperature of the mixed hot water. The remote control 4 displays the set temperature of the mixed hot water on the first display unit 45a. When the high temperature button 41a or the low temperature button 41b is operated, the display on the first display unit 45a changes according to the operation of each button 41a, 41b.

[0031] The temperature of the mixed hot and cold water in the faucet body 3 can be adjusted within a predetermined temperature range. When the low temperature button 41b is operated and the set temperature of the mixed hot and cold water becomes lower than the lowest temperature in the predetermined temperature range, the faucet body 3 does not mix hot water with cold water, and cold water is discharged.

[0032] The water volume adjustment button 42 is a button for adjusting the flow rate of hot and cold water dispensed from the faucet device 1. The water volume adjustment button 42 includes an increase water button 42a and a decrease water button 42b. The increase water button 42a is a button for increasing the flow rate of hot and cold water. The decrease water button 42b is a button for decreasing the flow rate of hot and cold water. The remote control 4 displays the set status of the hot and cold water volume on the second display unit 45b. When the increase water button 42a or the decrease water button 42b is operated, the display on the second display unit 45b changes in accordance with the operation of each button 42a, 42b. The flow rate of hot and cold water dispensed from the faucet device 1 can be adjusted within a predetermined flow rate range.

[0033] The switching button 43 is a button for switching between discharging hot and cold water and stopping the water supply in the faucet device 1. The switching button 43 is also a button for switching the destination of the hot and cold water supply in the faucet device 1. The switching buttons 43 include a faucet button 43a, a hand shower button 43b, an overhead shower button 43c, and a warm pillar button 43d. Each of the buttons 43a to 43d can be switched between "ON" and "OFF" when pressed by the user.

[0034] When each of the buttons 43a to 43d of the switching button 43 is set to "OFF," hot or cold water is not discharged. In other words, the water faucet device 1 is in a water stop state.

[0035] When any one of the switching buttons 43, 43a to 43d, is pressed from the "OFF" state, and the pressed switching button 43 becomes "ON," hot or cold water is discharged. In other words, the water faucet device 1 changes from a water stop state to a water discharge state.

[0036] When one of the switching buttons 43 is "ON" and another switching button 43 is pressed, the switching button 43 that is "ON" is changed, and the destination of hot and cold water is switched.

[0037] For example, when hand shower button 43b is "ON," hot and cold water is discharged from hand shower 22. When faucet button 43a is pressed in this state, hand shower button 43b turns "OFF" and faucet button 43a turns "ON." This changes the discharge destination of hot and cold water from hand shower 22 to faucet 21, and hot and cold water is discharged from faucet 21.

[0038] When the "ON" switch button 43 is pressed again, the pressed switch button 43 turns "OFF," and each of the buttons 43a to 43d of the switch button 43 turns "OFF," stopping the flow of hot and cold water. In other words, the water faucet device 1 changes from a water discharge state to a water stop state.

[0039] Each of the buttons 43a to 43d is configured so that the user can distinguish between the "ON" and "OFF" states. For example, a switching button 43 that is "ON" lights up, and a switching button 43 that is "OFF" lights up.

[0040] Although the faucet device 1 described here is capable of discharging hot and cold water from the overhead shower 23, warm pillar 24, hand shower 22, and faucet 21, it is not limited to this. For example, the faucet device 1 may be configured without the overhead shower 23 and warm pillar 24.

[0041] Next, an overview of the faucet device 1 according to the embodiment will be described with reference to Fig. 3. Fig. 3 is a block diagram showing an overview of the faucet device 1 according to the embodiment. In Fig. 3, the flow of hot and cold water is indicated by solid arrows, and communication lines are indicated by dashed lines.

[0042] The faucet device 1 comprises a plurality of water discharge units 2, a faucet body 3, a remote control 4, and a communication unit 5.

[0043] The plurality of water dischargers 2 include a faucet 21, a hand shower 22, an overhead shower 23, a warm pillar 24, and a hot water waiting outlet 25a connected to a residual water discharge flow path 25 (see FIG. 1).

[0044] The faucet body 3 includes a mixer faucet unit 50, a water discharge switching section 30, and a control device 7.

[0045] The mixer faucet unit 50 includes a hot and cold water mixing section 80, a flow rate adjustment section 100, and temperature sensors 48 and 49. Hot water is supplied to the hot and cold water mixing section 80 from a hot water supply source 37. In addition, water is supplied to the hot and cold water mixing section 80 from a water supply source 44. The temperature sensor 48 is provided upstream of the hot and cold water mixing section 80 and detects the temperature (water temperature) of the hot water supplied from the hot water supply source 37. The temperature sensor 49 is provided downstream of the hot and cold water mixing section 80 and detects the temperature (water temperature) of the hot water discharged from the hot and cold water mixing section 80. A stop valve 38 is provided in the hot water supply path 39 between the hot and cold water mixing section 80 and the hot water supply source 37. In addition, a stop valve 45 is provided in the water supply path 46 between the hot and cold water mixing section 80 and the water supply source 44.

[0046] The hot and cold water mixing unit 80 mixes hot water supplied from the hot water supply source 37 and cold water supplied from the cold water supply source 44. Specifically, the hot and cold water mixing unit 80 switches whether or not to mix hot water with cold water. The hot and cold water mixing unit 80 also adjusts the ratio of hot water to be mixed with cold water, thereby adjusting the temperature of the mixed hot and cold water.

[0047] The hot and cold water mixing unit 80 includes a motor 62. The motor 62 is, for example, a stepping motor, and the rotational position (drive amount) of the motor 62 is controlled by the number of steps. In response to operation of the temperature adjustment button 41 on the remote control 4, the hot and cold water mixing unit 80 drives the motor 62 to drive a temperature control valve 82 (valve body, see FIG. 6) to switch whether or not to mix hot water with cold water.

[0048] Furthermore, in response to operation of the temperature adjustment button 41 on the remote control 4, the hot water / cold water mixing unit 80 drives the temperature control valve 82 (see FIG. 6) by driving the motor 62, thereby adjusting the ratio of hot water to be mixed with water. Furthermore, even if the temperature adjustment button 41 is not operated, when the temperature of the hot water changes and the temperature of the mixed hot water / cold water changes, the hot water / cold water mixing unit 80 can automatically adjust the temperature of the mixed hot water / cold water by adjusting the ratio of the hot water flow rate to the water flow rate according to the temperature of the mixed hot water / cold water.

[0049] Hot and cold water flows into the flow rate adjusting unit 100 from the hot and cold water mixing unit 80. When hot and cold water is discharged from the water discharge unit 2, the flow rate adjusting unit 100 adjusts the flow rate of the discharged hot and cold water.

[0050] The flow rate adjustment unit 100 includes a motor 72. The motor 72 is, for example, a stepping motor, and the rotational position (drive amount) of the motor 72 is controlled by the number of steps. In response to operation of the water volume adjustment button 42 on the remote control 4, the motor 72 is driven to drive a flow regulation valve 102 (see FIG. 6), thereby adjusting the flow rate of hot and cold water.

[0051] The water discharge switching unit 30 switches between discharging and stopping the hot and cold water flowing out of the mixer faucet unit 50. In other words, the water discharge switching unit 30 switches between discharging and stopping the hot and cold water from the water discharge unit 2. The water discharge switching unit 30 also switches the destination of the hot and cold water to be discharged. The faucet device 1 switches between discharging and stopping the hot and cold water from the water discharge unit 2 using the water discharge switching unit 30, and adjusts the flow rate of the hot and cold water when it is being discharged using the flow rate adjustment unit 100.

[0052] The water discharge switching unit 30 includes a plurality of solenoid valves 31 to 35. Specifically, the water discharge switching unit 30 includes a first solenoid valve 31, a second solenoid valve 32, a third solenoid valve 33, a fourth solenoid valve 34, and a fifth solenoid valve 35.

[0053] The first solenoid valve 31 to the fourth solenoid valve 34 are switched between "closed (OFF)" and "open (ON)" in response to the operation of the switching button 43.

[0054] When the first solenoid valve 31 to the fourth solenoid valve 34 are "closed," hot or cold water is not discharged from the faucet 21, hand shower 22, overhead shower 23, or warm pillar 24. When any one of the first solenoid valve 31 to the fourth solenoid valve 34 is "open," hot or cold water is discharged from the faucet 21, hand shower 22, overhead shower 23, or warm pillar 24 that corresponds to the solenoid valve that is "open."

[0055] The first solenoid valve 31 switches between discharging hot and cold water at the faucet 21 and stopping the water flow. The second solenoid valve 32 switches between discharging hot and cold water at the hand shower 22 and stopping the water flow. The third solenoid valve 33 switches between discharging hot and cold water at the overhead shower 23 and stopping the water flow. The fourth solenoid valve 34 switches between discharging hot and cold water at the warm pillar 24 and stopping the water flow.

[0056] For example, when the first solenoid valve 31 is "open" and the second solenoid valve 32 to the fourth solenoid valve are "closed", hot and cold water is discharged from the faucet .

[0057] Fifth solenoid valve 35 is switched between "closed (OFF)" and "open (ON)" in response to switching of the water discharge mode using remote control 4 or operation by external device 6 (for example, a remote control installed in the bathroom). Fifth solenoid valve 35 is a valve for discharging residual water from hoses such as hand shower 22 and from piping, and is normally kept "closed." In other words, fifth solenoid valve 35 is "open" when residual water treatment is performed. When fifth solenoid valve 35 is "open," residual water (cold water) is discharged from hot water waiting outlet 25a via residual water discharge flow path 25.

[0058] The control device 7 controls the motors 62, 72 and the first solenoid valve 31 to the fourth solenoid valve 34 in response to the operation of the faucet body 3 received by operating the remote control 4. The control device 7 also controls the fifth solenoid valve 35 in response to the operation of the remote control 4 or the external device 6, for example.

[0059] The control device 7 is a controller. The control device 7 includes, for example, a microcomputer having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc., and various circuits. The control device 7 may also include hardware such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

[0060] The communication unit 5 receives operation signals from the remote control 4 and the external device 6, and transmits the received operation signals to the control device 7. The remote control 4 and the external device 6 are connected to the communication unit 5 via wired communication or wireless communication. The control device 7 is connected to the communication unit 5 via wired communication or wireless communication.

[0061] Next, the faucet body 3 will be described with reference to Figure 4. Figure 4 is a perspective view of the faucet body 3. In addition to a mixer faucet unit 50, a water discharge switching unit 30, and a control device 7 (see Figure 3), the faucet body 3 comprises a flow path unit 9. The faucet body 3 is attached to the wall 14a of the bathroom unit 10 (see Figure 1) by the flow path unit 9.

[0062] The flow path unit 9 is formed with a hot water supply path 39 (see Figure 3) that allows hot water supplied from a hot water supply source 37 (see Figure 3) to flow into the mixer tap unit 50, a water supply path 46 (see Figure 3) that allows water supplied from a water supply source 44 (see Figure 3) to flow into the mixer tap unit 50, and flow paths that allow hot and cold water to flow from the mixer tap unit 50 to each water discharge section 2. The flow path unit 9 is also provided with a water discharge switching section 30. The flow path unit 9 is also provided with stop valves 38, 45 (see Figure 3). The flow path unit 9 is also provided with a residual water discharge flow path 25.

[0063] In the faucet body 3, a flow path unit 9 is provided at the rear, and a mixer faucet unit 50 is provided in front of the flow path unit 9. A part of the flow path unit 9 is provided above the mixer faucet unit 50. Also, a control box 7a that houses the control device 7 is provided in front of the mixer faucet unit 50.

[0064] Next, the mixer faucet unit 50 will be described in detail with reference to Figures 5 and 6. Figure 5 is a perspective view of the mixer faucet unit 50. Figure 6 is a cross-sectional perspective view taken along line VI-VI shown in Figure 5.

[0065] 5 and 6, the mixer faucet unit 50 includes a unit body 51, a temperature adjustment motor section 60, a flow adjustment motor section 70, a hot and cold water mixing section 80, and a flow rate adjustment section 100. The mixer faucet unit 50 has a water outlet 52 provided in the unit body 51, and discharges hot and cold water from the water outlet 52.

[0066] The unit body 51 extends in the left-right direction. The hot and cold water mixer 80 and the flow rate adjuster 100 are inserted in the left-right direction into the unit body 51. That is, the insertion directions of the hot and cold water mixer 80 and the flow rate adjuster 100 coincide with the left-right direction.

[0067] A hot water inlet 53 connected to the hot water supply passage 39 (see FIG. 3) is formed on the left side of the unit body 51. A water inlet 54 connected to the water supply passage 46 (see FIG. 3) is formed in the middle of the unit body 51 in the left-right direction. The unit body 51 has the hot water inlet 53 and the water inlet 54 formed adjacent to each other in the left-right direction.

[0068] The temperature adjustment-side motor section 60 includes a cover 61 and a motor 62, and is provided at the left end of the unit body 51. The cover 61 is provided at the left end of the unit body 51 via a spacer 55. The motor 62 is provided inside the cover 61. The flow adjustment-side motor section 70 includes a cover 71 and a motor 72, and is provided at the right end of the unit body 51. The cover 71 is provided at the right end of the unit body 51 via a spacer 56. The motor 72 is provided inside the cover 71.

[0069] Motor 62 is an actuator that operates hot and cold water mixing section 80. Motor 62 switches whether or not to mix cold and hot water depending on the rotational position (drive amount) of motor 62. Furthermore, when discharging mixed hot and cold water, motor 62 sets the temperature of the mixed hot and cold water depending on the rotational position (drive amount) of motor 62. Motor 72 adjusts the flow rate of hot and cold water depending on the rotational position (drive amount) of motor 72.

[0070] The hot and cold water mixing unit 80 includes a main body casing 81, a temperature control valve 82, a temperature-sensitive spring 83 (temperature-sensitive biasing unit), a bias spring 84, a liner 85, and a spindle 86.

[0071] The main body casing 81 comprises a first main body casing 87 and a second main body casing 88. A hot water inlet 87a, which is a hot water inlet for the internal space of the main body casing 81, and a water inlet 87b, which is a cold water inlet for the same internal space, are formed in the peripheral wall of the first main body casing 87. A mixed hot water outlet 88a is formed in the right end of the second main body casing 88. The hot water inlet 87a, the water inlet 87b, and the mixed hot water outlet 88a are holes that connect the internal space of the main body casing 81 to the outside. The hot water inlet 87a and the water inlet 87b are formed in the middle part of the main body casing 81 in the left-right direction, so that the hot water inlet 87a is located to the left of the water inlet 87b.

[0072] The outer space of the main casing 81 is divided by O-rings 89a, 89b, and 89c, which are sealing members, so that the outer space of the main casing 81 is formed with an annular hot water flow path 89 facing the hot water inlet 87a and an annular water flow path 90 facing the cold water inlet 87b.

[0073] A water discharge flow path 91 is formed in the internal space of the main body casing 81. The water discharge flow path 91 can be communicated with the water discharge port 52 via the mixed hot and cold water outlet 88a and the flow adjustment valve .

[0074] The temperature sensitive spring 83 is housed in the second main body casing 88. The temperature sensitive spring 83 is provided in the water discharge flow path 91. The temperature sensitive spring 83 is a spring whose spring constant changes depending on the temperature, and is made of, for example, a shape memory alloy (SMA). The temperature sensitive spring 83 urges the temperature adjustment valve 82 leftward.

[0075] The bias spring 84 is housed in the first main body casing 87, which is provided to the left of the second main body casing 88. The bias spring 84 is provided in the water discharge flow path 91. The bias spring 84 is a spring whose spring constant is approximately constant with respect to temperature. The bias spring 84 biases the temperature control valve 82 to the right.

[0076] The temperature control valve 82 is provided inside the right side of the first main body casing 87. The temperature control valve 82 is incorporated so as to be slidable in the axial direction (left-right direction) of the first main body casing 87. The temperature control valve 82 moves left-right in response to the biasing force of the bias spring 84 and the biasing force of the temperature-sensing spring 83, and adjusts the state of communication between the hot water annular flow path 89 and the cold water annular flow path 90 and the water discharge flow path 91.

[0077] Specifically, the temperature control valve 82 is held in a position where the biasing force of the bias spring 84 and the biasing force of the temperature sensing spring 83 are balanced. As the temperature control valve 82 moves to the right, the opening of the hot water inlet 87a increases and the opening of the water inlet 87b decreases, so that the amount of hot water supplied to the water discharge flow path 91 increases and the amount of water decreases, and the temperature of the mixed hot water rises. As the temperature control valve 82 moves to the left, the opening of the hot water inlet 87a decreases and the opening of the water inlet 87b increases, so that the amount of hot water supplied into the main casing 81 decreases and the amount of water increases, and the temperature of the mixed hot water drops.

[0078] The liner 85 abuts against the end of the bias spring 84 opposite the temperature control valve 82, and is connected to the motor 62 via a spindle 86. The spindle 86 converts the rotational motion of the motor 62 into linear motion in the left-right direction of the liner 85. Therefore, the liner 85 moves left-right in response to the rotation of the motor 62.

[0079] In the hot and cold water mixing unit 80, the liner 85 moves left and right in accordance with the rotational position of the motor 62, and the position of the left end of the bias spring 84 is changed. Therefore, the hot and cold water mixing unit 80 can change the position of the temperature control valve 82 where the biasing force of the bias spring 84 and the biasing force of the temperature-sensing spring 83 are balanced in accordance with the rotational position of the motor 62. Therefore, when discharging mixed hot and cold water, the hot and cold water mixing unit 80 can set the temperature of the mixed hot and cold water to a temperature that corresponds to the rotational position of the motor 62.

[0080] Furthermore, when discharging mixed hot water, if the temperature of the hot water changes and the temperature of the mixed hot water changes, the temperature-sensitive spring 83 expands and contracts according to the temperature of the mixed hot water, the temperature control valve 82 moves left and right, and the equilibrium position of the temperature control valve 82 is automatically changed. This adjusts the amount of hot water and cold water flowing into the water discharge flow path 91, and the temperature of the mixed hot water is automatically adjusted.

[0081] The flow rate adjusting unit 100 includes a spindle 101 and a flow regulation valve 102. One end of the spindle 101 is connected to the motor 72, and the other end is connected to the flow regulation valve 102.

[0082] The flow regulation valve 102 is provided in the water discharge flow path 91. The flow regulation valve 102 rotates in accordance with the rotation of the motor 72. A communication port 102a is formed in the flow regulation valve 102. The flow regulation valve 102 is provided so as to face the water discharge port 52 of the unit main body 51. The flow regulation valve 102 rotates in accordance with the rotation of the motor 72, thereby changing the communication area between the communication port 102a and the water discharge port 52 and thereby changing the flow rate.

[0083] Specifically, when the motor 72 is in a predetermined water stop position, the communication port 102a does not communicate with the water discharge port 52. Therefore, when the motor 72 is in the predetermined water stop position, hot or cold water is not discharged from the water discharger 2.

[0084] When the motor 72 rotates from the water stop position to the water discharge position, for example, the communication port 102a communicates with the water discharge port 52. As a result, hot and cold water is discharged from the water discharge port 52.

[0085] The flow regulation valve 102 can change the area of ​​communication between the communication port 102a and the water discharge port 52 according to the rotational position of the motor 72. In other words, the flow rate adjustment unit 100 can adjust the flow rate of hot and cold water discharged from the water discharge unit 2 according to the rotational position of the motor 72.

[0086] Note that the control device 7 does not perform fine adjustments through feedback control in the temperature and flow regulation control of the faucet device 1. Furthermore, even when the water flow state transitions from a discharge state to a stopped state, the process of returning the motors 62 and 72 to their origin positions (the control reference position) is not performed each time the water flow is stopped, so it is expected that step-outs and the like will occur, and as these gradually accumulate, the opening positions of the motors 62 and 72 will shift. To prevent this from happening, the control device 7 performs a "return to origin" process, which returns the positions of the motors 62 and 72 to their origin positions, at regular intervals, for example.

[0087] Next, the temperature adjustment control of the water faucet device 1 will be described with reference to Fig. 7. Fig. 7 is a flowchart showing the processing procedure for temperature adjustment control.

[0088] As shown in FIG. 7, the control device 7 receives a request to change the temperature adjustment setting from the remote control 4 (step S101).

[0089] Next, the control device 7 acquires a temperature control setting value from the remote control 4 (step S102). The temperature control setting value is the value of the set temperature transmitted from the remote control 4.

[0090] Next, the control device 7 acquires a temperature adjustment correction value from the remote control 4 (step S103). The temperature adjustment correction value is a value for correcting the temperature adjustment set value to a higher or lower temperature. The temperature adjustment correction value is set in advance by the remote control 4.

[0091] Next, the control device 7 drives the motor 62 to a predetermined rotation position based on the temperature control opening table (step S104), and ends the process. The temperature control opening table is, for example, data that associates the set temperature with the rotation position of the motor 62. For example, when the temperature control set value is 40°C and the temperature control correction value is +1°C, the control device 7 refers to the table value (rotation position) of 41°C in the temperature control opening table.

[0092] As described above, in the faucet device 1, the hot and cold water mixer 80 includes a main casing 81 in which a water inlet 87b, a hot water inlet 87a, and a mixed hot and cold water outlet 88a are formed, a temperature-sensitive spring 83 whose biasing force changes depending on the temperature of the mixed hot and cold water and which can adjust the opening of the hot water inlet 87a and the cold water inlet 87b, and a temperature control valve 82 that is slidably mounted in the axial direction within the main casing 81 and can adjust the opening of the hot water inlet 87a and the cold water inlet 87b. Upon receiving information about the set temperature, the control device 7 adjusts the axial position of the temperature control valve 82 by driving the motor 62 to a predetermined rotational position or by a predetermined drive amount that corresponds to the set temperature.

[0093] The control device 7 can also execute a calibration mode. The calibration mode adjusts the setting of a predetermined rotation position or a predetermined drive amount in accordance with at least one of the environment in which the faucet device 1 is installed and product variations. In the calibration mode, for example, multiple target temperatures are set in the control device 7, and the control device 7 performs a process to adjust the discharged water temperature to the target temperature for each target temperature. In this process, the control device 7 drives the motor 62 so that the discharged water temperature becomes the target temperature while discharging water from the water discharge section 2 (for example, hot water waiting outlet 25a), and searches for the rotation position or drive amount of the motor 62 for each target temperature. The control device 7 can adjust the setting of the predetermined rotation position or drive amount based on the searched rotation position or drive amount of the motor 62.

[0094] Next, the configuration of the overcurrent protection of the faucet device 1 according to the embodiment will be described with reference to Figures 8 and 9. Figures 8 and 9 are block diagrams showing the configuration of the overcurrent protection of the faucet device 1 according to the embodiment.

[0095] 8, the control device 7 has a control board 95. The control board 95 has a first control unit 95a, a second control unit 95b, a third control unit 95c, and a fourth control unit 95d.

[0096] The first control unit 95a is composed of a first solenoid valve drive control unit 96a that controls the drive of the second solenoid valve 32 (for example, by turning on and off the power supply), and a first overcurrent protection circuit 97a that protects the second solenoid valve 32 from overcurrent. The first control unit 95a may be composed of an integrated IC that integrates the first solenoid valve drive control unit 96a and the first overcurrent protection circuit 97a, or may be composed of a combination of the first solenoid valve drive control unit 96a and the first overcurrent protection circuit 97a as a single electronic component. The first control unit 95a is connected to the second solenoid valve 32 and controls the drive of the second solenoid valve 32 and protects it from overcurrent. The second solenoid valve 32 is configured to be driven when power is supplied.

[0097] The second control unit 95b is composed of a second solenoid valve drive control unit 96b that controls the drive of the first solenoid valve 31, the third solenoid valve 33, the fourth solenoid valve 34, and the fifth solenoid valve 35, and a second overcurrent protection circuit 97b that protects the first solenoid valve 31, the third solenoid valve 33, the fourth solenoid valve 34, and the fifth solenoid valve 35 from overcurrent. The second control unit 95b may be composed of an integrated IC that integrates the second solenoid valve drive control unit 96b and the second overcurrent protection circuit 97b, or may be composed of a combination of the second solenoid valve drive control unit 96b and the second overcurrent protection circuit 97b as a single electronic component. The control board 95 is composed of a common power supply unit for driving the first solenoid valve 31, the third solenoid valve 33, the fourth solenoid valve 34, and the fifth solenoid valve 35, and the solenoid valve drive units 31a to 35a are controlled by a microcomputer (CPU).

[0098] For example, the second control unit 95b is connected to the first solenoid valve drive unit 31a and the first solenoid valve 31, and performs drive control of and overcurrent protection for the first solenoid valve 31. The second control unit 95b is also connected to the third solenoid valve drive unit 33a and the third solenoid valve 33, and performs drive control of and overcurrent protection for the third solenoid valve 33. The second control unit 95b is also connected to the fourth solenoid valve drive unit 34a and the fourth solenoid valve 34, and performs drive control of and overcurrent protection for the fourth solenoid valve 34. The second control unit 95b is also connected to the fifth solenoid valve drive unit 35a and the fifth solenoid valve 35, and performs drive control of and overcurrent protection for the fifth solenoid valve 35.

[0099] The first solenoid valve 31 is driven by a drive signal S sent to the first solenoid valve drive unit 31a. The third solenoid valve 33 is driven by a drive signal S sent to the third solenoid valve drive unit 33a. The fourth solenoid valve 34 is driven by a drive signal S sent to the fourth solenoid valve drive unit 34a. The fifth solenoid valve 35 is driven by a drive signal S sent to the fifth solenoid valve drive unit 35a. In this way, the control device 7 can individually drive the first solenoid valve 31, the third solenoid valve 33, the fourth solenoid valve 34, and the fifth solenoid valve 35 by sending drive signals S to the first solenoid valve drive unit 31a, the third solenoid valve drive unit 33a, the fourth solenoid valve drive unit 34a, and the fifth solenoid valve drive unit 35a. The drive signal S is a signal transmitted from the CPU 98 (see FIG. 12).

[0100] The third control unit 95c is composed of a third solenoid valve drive control unit 96c that controls the drive of the motor 62 and a third overcurrent protection circuit 97c for the motor 62. The third control unit 95c may be composed of an integrated IC that integrates the third solenoid valve drive control unit 96c and the third overcurrent protection circuit 97c, or may be composed of a combination of the third solenoid valve drive control unit 96c and the third overcurrent protection circuit 97c as a single electronic component. The third control unit 95c is connected to the motor 62 and controls the drive of the motor 62 and protects it from overcurrent. The motor 62 is configured to be driven by a supply of power.

[0101] The fourth control unit 95d is composed of a fourth solenoid valve drive control unit 96d that controls the drive of the motor 72 and a fourth overcurrent protection circuit 97e that protects the motor 72 from overcurrent. The fourth control unit 95d may be composed of an integrated IC that integrates the fourth solenoid valve drive control unit 96d and the fourth overcurrent protection circuit 97d, or may be composed of a combination of the fourth solenoid valve drive control unit 96d and the fourth overcurrent protection circuit 97d as a single electronic component. The fourth control unit 95d is connected to the motor 72 and controls the drive of the motor 72 and protects it from overcurrent. The motor 72 is configured to be driven by a supply of power.

[0102] As shown in FIG. 9, the control board 95 may be configured to have a circuit (aggregated IC 95e) that further aggregates the first control unit 95a, the second control unit 95b, the third control unit 95c, and the fourth control unit 95d.

[0103] For example, the aggregated IC 95e is connected to the first solenoid valve driver 31a and the first solenoid valve 31, and performs drive control and overcurrent protection for the first solenoid valve 31. The aggregated IC 95e is also connected to the third solenoid valve driver 33a and the third solenoid valve 33, and performs drive control and overcurrent protection for the third solenoid valve 33. The aggregated IC 95e is also connected to the fourth solenoid valve driver 34a and the fourth solenoid valve 34, and performs drive control and overcurrent protection for the fourth solenoid valve 34. The aggregated IC 95e is also connected to the fifth solenoid valve driver 35a and the fifth solenoid valve 35, and performs drive control and overcurrent protection for the fifth solenoid valve 35.

[0104] The first solenoid valve 31 is driven by sending a drive signal S to the first solenoid valve drive unit 31a. The third solenoid valve 33 is driven by sending a drive signal S to the third solenoid valve drive unit 33a. The fourth solenoid valve 34 is driven by sending a drive signal S to the fourth solenoid valve drive unit 34a. The fifth solenoid valve 35 is driven by sending a drive signal S to the fifth solenoid valve drive unit 35a. In this way, the control device 7 can individually drive the first solenoid valve 31, the third solenoid valve 33, the fourth solenoid valve 34, and the fifth solenoid valve 35 by sending drive signals S to the first solenoid valve drive unit 31a, the third solenoid valve drive unit 33a, the fourth solenoid valve drive unit 34a, and the fifth solenoid valve drive unit 35a.

[0105] Furthermore, the aggregation IC 95e is connected to the second solenoid valve 32 and performs drive control and overcurrent protection for the second solenoid valve 32. The second solenoid valve 32 is configured to be driven when power is supplied.

[0106] The integrated IC 95e is connected to the motor 62 and performs drive control and overcurrent protection for the motor 62. The motor 62 is configured to be driven when power is supplied.

[0107] The integrated IC 95e is connected to the motor 72 and performs drive control and overcurrent protection for the motor 72. The motor 72 is configured to be driven when power is supplied.

[0108] Next, the overcurrent protection circuit of the faucet device 1 according to this embodiment will be described with reference to Figures 10 to 12. Figure 10 is a diagram showing an example of an overcurrent protection circuit 97. Figures 11 and 12 are diagrams showing the circuit configuration of the faucet device 1 according to this embodiment. Note that the dashed arrows in Figure 11 indicate the flow of current supplied via the internal switch 97a2. Furthermore, the dashed arrows in Figure 12 indicate the flow of current supplied via the internal switch 97b2 when switch SW1 is "ON" and switches SW3, SW4, and SW5 are "OFF."

[0109] The overcurrent protection circuit 97 is capable of cutting off the power supply to the electric load L when an overcurrent flows from the power supply to the electric load L. In this embodiment, the electric load L is the solenoid valves 31-35 and the motors 62 and 72. Note that the solenoid valves 31-35, which are the electric load L, may be motors, and the motors may be used to open and close the flow path. The overcurrent protection circuit 97 stops the output when an overcurrent occurs in an abnormal state, such as when the output is shorted. As shown in FIG. 10, one example of the overcurrent protection circuit 97 opens the output when a specified current flows for a certain period of time (e.g., several microseconds), and automatically returns to normal operation when the current falls below a threshold.

[0110] For example, the overcurrent protection circuit 97 detects current using a shunt resistor Rcs for current detection, and amplifies the detected current into a voltage signal using an amplifier circuit A and outputs it. The overcurrent protection circuit 97 then controls the output result within the CPU 98. At this time, a threshold value and a period are set within the CPU 98 or by an external component. If the output result exceeds the threshold value for the set period, the overcurrent protection circuit 97 turns the switch SW "OFF." In this way, the overcurrent protection circuit 97 can be configured to prevent the overcurrent from continuing to flow through the electrical load L when an overcurrent is detected. The switch SW is also used for normal drive control.

[0111] As shown in FIG. 11, the control board 95 of this embodiment includes an integrated IC 95e. The first overcurrent protection circuit 97a includes a current determination unit 97a1 and an internal switch 97a2. The overcurrent protection unit 96 supplies a power supply voltage Vcc to a solenoid valve (e.g., the second solenoid valve 32) via the internal switch 97a2 (short-circuited state) in the integrated IC 95e. When the current determination unit 97a1 detects that a current greater than or equal to a threshold is flowing, the overcurrent protection unit 96 opens the internal switch 97a2 to cut off power. The CPU 98 includes a drive control unit 98a. The CPU 98 communicates with the integrated IC 95e, and the drive control unit 98a can control the drive of the internal switch 97a2 in the integrated IC 95e.

[0112] As shown in FIG. 12, when multiple solenoid valves (e.g., solenoid valves 31, 33-35) are grouped together in a single overcurrent protection circuit 97 (e.g., second overcurrent protection circuit 97b), the multiple solenoid valves 31, 33-35 are mutually exclusive in terms of control specifications and are not driven simultaneously. For example, when switch SW1 of first solenoid valve 31 is "ON," CPU 98 controls switch SW3 of third solenoid valve 33, switch SW4 of fourth solenoid valve 34, and switch SW5 of fifth solenoid valve 35 to be "OFF." As with the first overcurrent protection circuit 97a described above, CPU 98 communicates with aggregation IC 95e, and the drive control unit 98a can control the drive of internal switch 97b2 within aggregation IC 95e.

[0113] As described above, the faucet device 1 of the embodiment is a faucet device 1 equipped with at least three or more water outlets 2 that discharge water into the bathroom, an electrical load L that switches the water discharge of the water outlets 2 on and off, and an overcurrent protection circuit 97 that can cut off the flow of electricity to the electrical load L when an overcurrent flows from the power source to the electrical load L, and the overcurrent protection circuit 97 has a first overcurrent protection circuit 97a connected to the electrical load L corresponding to one of the water outlets 2, and a second overcurrent protection circuit 97b connected to the electrical load L corresponding to the other water outlet 2.

[0114] The faucet device 1 allows for a smaller circuit size related to overcurrent protection compared to when an overcurrent protection circuit 97 is provided for each electrical load L. Furthermore, compared to when all overcurrent protection circuits 97 are combined into one, at least one water discharger 2 can continue to be used even if one of the electrical loads L fails due to an overcurrent. In other words, it is possible to achieve both a smaller circuit size and ease of use for the user.

[0115] In addition, the three or more water outlets 2 have at least a faucet 21 and a hand shower 22, and an electrical load L (for example, the first solenoid valve 31 or the second solenoid valve 32) corresponding to either the faucet 21 or the hand shower 22 is connected to the first overcurrent protection circuit 97a.

[0116] The faucet device 1 separates the faucet 21 and the hand shower 22 and combines the overcurrent protection circuit 97, so that even if the electric load L breaks down due to an overcurrent, the user can continue to use either the faucet 21 or the hand shower 22, whichever is more frequently used, thereby improving usability for the user.

[0117] Furthermore, an electrical load L (for example, the second solenoid valve 32) corresponding to the hand shower 22 is connected to the first overcurrent protection circuit 97a.

[0118] In the event of a failure of the electrical load L (for example, any one of the first solenoid valve 31, the second solenoid valve 32, the third solenoid valve 33 and the fifth solenoid valve 35) corresponding to the other water outlet 2, the faucet device 1 allows the user to continue using the hand shower 22 which is the easiest for the user to handle, thereby improving usability for the user.

[0119] One of the water discharge sections 2 has an overhead shower 23 or a hot water waiting outlet 25a that discharges cold water from within the faucet body 3.

[0120] The faucet device 1 can consolidate overcurrent protection circuits 97 relating to the water discharge parts 2 that are used in different situations and discharge locations, making it easier for the user to notice a malfunction in the electrical load L and improving usability for the user.

[0121] It also includes a hot and cold water mixing section 80 that mixes the hot and cold water to be supplied to the water discharge section 2, a flow rate adjustment section 100 that adjusts the flow rate of the hot and cold water to be supplied to the water discharge section 2, a motor 62 that operates the hot and cold water mixing section 80, and a motor 72 that operates the flow rate adjustment section 100, and the overcurrent protection circuit 97 has a third overcurrent protection circuit 97c connected to the motor 62 and a fourth overcurrent protection circuit 97d connected to the motor 72.

[0122] In the faucet device 1, the overcurrent protection circuit 97 related to the hot and cold water mixing section 80 and the flow rate adjustment section 100 is separate from the overcurrent protection circuit 97 related to the water discharge section 2, so when one water discharge function is used continuously, temperature adjustment and flow rate adjustment can also be performed continuously, making it easier for the user to use.

[0123] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

[0124] <Additional Notes> (1) At least three or more water outlets that discharge water into the bathroom; an electrical load for switching the water discharge section to stop or stop; an overcurrent protection circuit capable of cutting off current flow to the electrical load when an overcurrent flows from a power source to the electrical load; A water faucet device comprising: The overcurrent protection circuit includes: a first overcurrent protection circuit connected to an electrical load corresponding to one of the water dischargers; a second overcurrent protection circuit connected to an electrical load corresponding to the other water discharge portion; A faucet device having the same. (2) The three or more water outlets have at least a faucet and a hand shower, The water faucet device according to (1), wherein an electrical load corresponding to either the faucet or the hand shower is connected to the first overcurrent protection circuit. (3) The water faucet device according to (2), wherein an electrical load corresponding to the hand shower is connected to the first overcurrent protection circuit. (4) The faucet device according to any one of (1) to (3), wherein the other water discharge portion has an overhead shower or a water discharge portion that discharges cold water from within the faucet body. (5) A hot and cold water mixing unit that mixes hot and cold water to be supplied to the water discharge unit; a flow rate adjusting unit that adjusts the flow rate of hot and cold water supplied to the water discharge unit; a first motor that operates the hot and cold water mixing unit; a second motor that operates the flow rate adjusting unit; Furthermore, The overcurrent protection circuit includes: The faucet device according to any one of (1) to (3), further comprising a third overcurrent protection circuit connected to the first motor and a fourth overcurrent protection circuit connected to the second motor. [Explanation of symbols]

[0125] 1. Faucet equipment 2. Water outlet 7 Control Device 21 Faucet (spout) 22 Hand shower (water outlet) 23 Overhead shower (water outlet) 24 Warm pillar (water outlet) 25a Hot water outlet (water outlet) 31 First solenoid valve (electrical load) 32 Second solenoid valve (electrical load) 33 Third solenoid valve (electrical load) 34 4th solenoid valve (electrical load) 35 5th solenoid valve (electrical load) 62 Motor (electrical load) 72 Motor (electrical load) 80 Hot water mixing section 97 Overcurrent protection circuit 97a 1st overcurrent protection circuit 97b 2nd overcurrent protection circuit 97c 3rd overcurrent protection circuit 97d 4th overcurrent protection circuit 100 Flow rate adjustment section L Electrical load

Claims

1. At least three or more water discharge units that discharge water into the bathroom; an electrical load for switching the water discharge section to stop or stop; an overcurrent protection circuit capable of cutting off current flow to the electrical load when an overcurrent flows from a power source to the electrical load; A water faucet device comprising: The overcurrent protection circuit includes: a first overcurrent protection circuit connected to an electrical load corresponding to one of the water dischargers; a second overcurrent protection circuit connected to an electrical load corresponding to the other water discharger; A faucet device having the same.

2. the three or more water outlets include at least a faucet and a hand shower; The water faucet device according to claim 1, wherein an electrical load corresponding to either the faucet or the hand shower is connected to the first overcurrent protection circuit.

3. 3. The water faucet device according to claim 2, wherein an electrical load corresponding to the hand shower is connected to the first overcurrent protection circuit.

4. The faucet device according to claim 3, wherein the other water discharge portion has an overhead shower or a water discharge portion that discharges cold water from within the faucet body.

5. A hot and cold water mixing unit that mixes hot and cold water to be supplied to the water discharge unit; a flow rate adjusting unit that adjusts the flow rate of hot and cold water supplied to the water discharge unit; a first motor that operates the hot and cold water mixing unit; a second motor that operates the flow rate adjusting unit; Furthermore, The overcurrent protection circuit includes: A faucet device according to any one of claims 1 to 4, comprising a third overcurrent protection circuit connected to the first motor and a fourth overcurrent protection circuit connected to the second motor.

Images