Power control device and washing machine

Abstract

This prevents the control circuit from immediately shutting down when the power supply from the AC power source is interrupted. [Solution] The power control device is a power control device 3 for an electrical device, comprising: a first rectifier-smoothing circuit 30 including a first smoothing capacitor 201 and connected between an AC power supply 4 and a load 35; a second rectifier-smoothing circuit 31 including a second smoothing capacitor 202 and connected between an AC power supply 4 and a first control circuit 36 ​​that controls the load 35; and a bypass circuit 32 connected between the output side of the first rectifier-smoothing circuit 30 and the output side of the second rectifier-smoothing circuit 31.

Description

Technical Field

[0001] The present disclosure relates to a power control device applied to an electrical device and a washing machine.

Background Art

[0002] Patent Document 1 discloses a power supply control device including a control system power supply that supplies voltage to a control circuit such as a microcomputer, a power system power supply that drives a power system load such as a washing motor by controlling a power system power relay, and a door opening / closing switch that controls the control system power supply in conjunction with the opening and closing of a door, and supplies voltage from the control system power supply to the control circuit by the opening / closing operation of the door opening / closing switch.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=3z]]However, in the prior art, when the power supply from an AC power supply is interrupted, the control circuit may stop immediately.

[0005] The present disclosure provides a power control device and a washing machine that suppress the control circuit from stopping immediately when the power supply from an AC power supply is interrupted.

Means for Solving the Problems

[0006] A power control device according to an aspect of the present disclosure is a power control device for an electrical device, including a first smoothing capacitor, a first rectifying and smoothing circuit connected between an AC power supply and a load, a second smoothing capacitor, a second rectifying and smoothing circuit connected between the AC power supply and a control circuit for controlling the load, and a bypass circuit connected between an output side of the first rectifying and smoothing circuit and an output side of the second rectifying and smoothing circuit. [Effects of the Invention]

[0007] According to this disclosure, it is possible to prevent the control circuit from immediately shutting down when the power supply from the AC power source is interrupted. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows the external configuration of a washing machine according to an embodiment of the present disclosure. [Figure 2] This is a circuit diagram of a washing machine according to an embodiment of the present disclosure. [Figure 3] This is a circuit diagram of the first rectifier-smoothing circuit and the second rectifier-smoothing circuit in the embodiments of the present disclosure. [Figure 4] This is a circuit diagram of the first rectifier-smoothing circuit and the second rectifier-smoothing circuit in the embodiments of the present disclosure. [Figure 5] This is a circuit diagram of the first rectifier-smoothing circuit and the second rectifier-smoothing circuit in the embodiments of the present disclosure. [Figure 6] This graph illustrates the operation of the power control device during a power outage in the embodiments of the present disclosure. [Figure 7] This is a circuit diagram of a washing machine in a first modified example of an embodiment of the present disclosure. [Modes for carrying out the invention]

[0009] (Knowledge forming the basis of this disclosure) In recent years, electrical appliances such as washing machines have been equipped with power control devices that keep the control circuit of the electrical appliance constantly powered, for purposes such as receiving information from a network when the load is not operating. Such power control devices are equipped with large-capacity smoothing capacitors to supply appropriate power to the load. As a result, such power control devices have high power consumption when in standby mode. Therefore, a power control device has been proposed that divides the rectifier and smoothing circuit into a first rectifier and smoothing circuit for the load, which includes a relatively large-capacity smoothing capacitor, and a second rectifier and smoothing circuit for the control circuit, which includes a relatively small-capacity smoothing capacitor, and is configured to maintain the connection between the AC power supply and the second rectifier and smoothing circuit while disconnecting the connection between the AC power supply and the first rectifier circuit when in standby mode (for example, Patent Document 1).

[0010] However, in such power control devices, the capacitance of the smoothing capacitor in the second smoothing circuit is small. Therefore, in the event of an AC power outage, the power stored in this smoothing capacitor may not be sufficient to ensure the operation period of the control circuit, potentially causing the control circuit to stop immediately. As a result, the control circuit may not be able to ensure sufficient time to execute controls necessary to completely stop the load (e.g., motor brake control), potentially preventing the load from being safely stopped.

[0011] Therefore, the present inventors have come up with the idea of ​​this disclosure, based on the finding that if the output side of the first rectifier-smoothing circuit and the output side of the second rectifier-smoothing circuit are connected by a bypass circuit, the power stored in the large-capacity first smoothing capacitor will be supplied to the control circuit via the bypass circuit during a power outage, thereby preventing the control circuit from immediately stopping operation.

[0012] (1) A power control device in one aspect of the present disclosure is a power control device for an electrical device, comprising: a first rectifier-smoothing circuit including a first smoothing capacitor and connected between an AC power source and a load; a second rectifier-smoothing circuit including a second smoothing capacitor and connected between an AC power source and a control circuit for controlling a load; and a bypass circuit connected between the output side of the first rectifier-smoothing circuit and the output side of the second rectifier-smoothing circuit.

[0013] According to this configuration, when the AC power supply experiences a power outage, the power stored in the first smoothing capacitor is supplied to the control circuit via the bypass circuit. Therefore, the control circuit can operate using the power stored in the first smoothing capacitor in addition to the power stored in the second smoothing capacitor. As a result, this configuration can avoid a situation where the control circuit immediately stops operating during a power outage. Thereby, this configuration can ensure that the control circuit has a period for executing control to completely stop the load, and can safely stop the load.

[0014] (2) In the power control device described in (1) above, the capacitance of the first smoothing capacitor may be larger than the capacitance of the second smoothing capacitor.

[0015] According to this configuration, when the AC power supply experiences a power outage, more power is supplied from the first smoothing capacitor to the control circuit, so the control circuit can operate for a longer time.

[0016] (3) In the power control device described in (1) or (2) above, further comprising a first positive line and a first negative line connected between the first rectifying and smoothing circuit and the load, and a second positive line and a second negative line connected between the second rectifying and smoothing circuit and the control circuit, the bypass circuit may include a first bypass circuit connected between the first positive line and the second positive line, and a second bypass circuit connected between the first negative line and the second negative line.

[0017] According to this configuration, the first bypass circuit and the second bypass circuit ensure a current path from the first smoothing capacitor, through the control circuit, and back to the first smoothing circuit.

[0018] (4) In the power control device described in (3) above, at least one of the first bypass circuit and the second bypass circuit may include an active element.

[0019] According to this configuration, since at least one of the first bypass circuit and the second bypass circuit includes an active element, it is possible to suppress the energization of the load when the load is not operating.

[0020] (5) In the power supply control device according to (4) above, the active element may be a diode.

[0021] According to this configuration, the bypass circuit can be configured at low cost with a diode.

[0022] (6) In the power supply control device according to any one of (1) to (5) above, the first rectifying and smoothing circuit may be configured as a voltage doubler circuit, and the second rectifying and smoothing circuit may be configured as a full-wave rectifying circuit.

[0023] According to this configuration, since the first rectifying and smoothing circuit is configured as a voltage doubler circuit, a high voltage required for the operation of the load can be supplied to the load. Since the second rectifying and smoothing circuit is configured by a full-wave rectifying circuit, a DC voltage with less ripple can be supplied to the control circuit.

[0024] (7) In the power supply control device according to any one of (1) to (6) above, the power supply control device further includes a startup circuit that connects the AC power supply and the first rectifying and smoothing circuit in response to a startup instruction, and the second rectifying and smoothing circuit may be directly connected to the AC power supply.

[0025] According to this configuration, since the second rectifying and smoothing circuit is directly connected to the AC power supply, the control circuit can be constantly energized. On the other hand, since the first rectifying and smoothing circuit is connected to the AC power supply in response to a startup instruction, power supply to the load during standby of the load is suppressed. As a result, this configuration can reduce power consumption while constantly energizing the control circuit.

[0026] (8) In the power control device described in any of (1) to (7) above, the first rectifier-smoothing circuit may include a plurality of rectifier-smoothing circuits, the load may include a plurality of loads corresponding to the plurality of rectifier-smoothing circuits, and the bypass circuit may include a plurality of bypass circuits corresponding to the plurality of rectifier-smoothing circuits.

[0027] With this configuration, power is supplied to the control circuit from multiple smoothing capacitors included in multiple rectifier-smoothing circuits, allowing the control circuit to operate for a longer period during a power outage.

[0028] (9) A washing machine in another aspect of the present disclosure comprises a power control device as described in any of (1) to (8) above.

[0029] This configuration allows the control circuit to ensure a period of time for executing control to completely stop the load, thereby providing a washing machine that can safely stop the load.

[0030] (Embodiment) The embodiments will be described in detail below with reference to the drawings. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters or redundant explanations of substantially identical configurations may be omitted. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims.

[0031] [Overall structure] Figure 1 is a diagram showing the external configuration of a washing machine 1 according to an embodiment of the present disclosure. In the example shown in Figure 1, the washing machine 1 is a drum-type washing machine having a drum, but it may also be a top-loading washing machine having a washing tub. A display unit 23 using a liquid crystal display or an organic EL display, etc., and various operation buttons pressed by the user are arranged on the upper front of the washing machine 1. The operation buttons include a start button 24 and an end button 25. The start button 24 is a button that receives a start command from the user and is pressed when washing is started. The end button 25 is pressed when the operation of the washing machine 1 is forcibly terminated or otherwise stopped.

[0032] [Circuit Configuration] Figure 2 is a circuit diagram of a washing machine according to an embodiment of the present disclosure. The washing machine 1 includes an operation display unit 2, a power control device 3, and a load 35. The operation display unit 2 is an interface circuit having the function of receiving operations from the user, displaying the status of the washing machine 1, and connecting the washing machine 1 to a network for communication. The power control device 3 controls the supply of power from an AC power source 4, such as a commercial power source, to the load 35. The load 35 includes, for example, a drive motor for rotating the drum in a drum-type washing machine. The load 35 includes a drive motor for rotating the washing tub in a top-loading washing machine. If the washing machine 1 is a washer-dryer with a drying function, the load 35 includes a heater and a blower fan, etc.

[0033] The power control device 3 includes a first rectifier-smoothing circuit 30, a second rectifier-smoothing circuit 31, a bypass circuit 32, a current-limiting resistor 33, a control circuit power supply 34, a first control circuit 36, a first relay drive circuit 37, a first relay 38, a second relay drive circuit 39, and a second relay 40. The current-limiting resistor 33, the first relay drive circuit 37, the first relay 38, the second relay drive circuit 39, and the second relay 40 constitute a starting circuit. The current-limiting resistor 33 may be a resistive element or an NTC (Negative Temperature Coefficient) thermistor, etc. The first control circuit 36 ​​and the second control circuit 20 constitute a control circuit.

[0034] The first rectifier-smoothing circuit 30 includes a first smoothing capacitor 201 and is connected between the AC power supply 4 and the load 35. The first rectifier-smoothing circuit 30 converts the AC power output by the AC power supply 4 into DC power by rectifying and smoothing the AC power, and supplies the converted DC power to the load 35. In other words, the first rectifier-smoothing circuit 30 is a rectifier-smoothing circuit for the load.

[0035] The second rectifier-smoothing circuit 31 includes a second smoothing capacitor 202 and is connected between the AC power supply 4 and the first control circuit 36. The second rectifier-smoothing circuit 31 rectifies and smooths the AC power supplied by the AC power supply 4, converting the AC power into DC power, and supplies the converted DC power to the first control circuit 36. In other words, the second rectifier-smoothing circuit 31 is a control rectifier-smoothing circuit.

[0036] The capacitance of the first smoothing capacitor 201 is greater than the capacitance of the second smoothing capacitor 202. Therefore, when the AC power supply 4 is interrupted, the first control circuit 36 ​​is supplied with power from the first smoothing capacitor 201 in addition to the second smoothing capacitor 202. As a result, the first control circuit 36 ​​and the second control circuit 20 can operate for a longer period of time. On the other hand, since the capacitance of the second smoothing capacitor 202 is small, the leakage current from the second smoothing capacitor 202 is reduced. This makes it possible to operate the washing machine 1 continuously with low power consumption. The capacitance of the first smoothing capacitor 201 is, for example, several tens to several hundreds of times greater than the capacitance of the second smoothing capacitor 202.

[0037] The first rectifier-smoothing circuit 30 and the load 35 are connected by a first positive line 401 and a first negative line 402. The second rectifier-smoothing circuit 31 and the first control circuit 36 ​​are connected by a second positive line 411 and a second negative line 412.

[0038] The control circuit power supply 34 is, for example, composed of a switching regulator, which adjusts the magnitude of the DC voltage output by the second rectifier-smoothing circuit 31 to a magnitude suitable for driving the control circuit power supply 34. The control circuit power supply 34 is provided in the second positive line 411 between the bypass circuit 32 and the first control circuit 36.

[0039] The first control circuit 36 ​​is configured, for example, by a microcontroller.

[0040] The bypass circuit 32 is connected between the output side of the first rectifier-smoothing circuit 30 and the output side of the second rectifier-smoothing circuit 31. When the AC power supply 4 fails, the bypass circuit 32 supplies the power stored in the first smoothing capacitor to the first control circuit 36 ​​and the second control circuit 20. This ensures that, in the event of a power outage, the first control circuit 36 ​​and the second control circuit 20 have sufficient time to execute the control necessary to completely stop the operation of the load 35.

[0041] In detail, the bypass circuit 32 includes a first bypass circuit 321 and a second bypass circuit 322. The first bypass circuit 321 is connected between the first positive line 401 and the second positive line 411.

[0042] The second bypass circuit 322 is connected between the first negative line 402 and the second negative line 412.

[0043] The first bypass circuit 321 includes a diode 331. The second bypass circuit 322 includes a diode 332. Diode 331 has its anode connected to the first positive line 401 and its cathode connected to the second positive line 411. Diode 332 has its anode connected to the second negative line 412 and its cathode connected to the first negative line 402. This ensures a current path through which current flows from the first smoothing capacitor 201 to the diode 331, the control circuit power supply 34, the first control circuit 36, the diode 332, and the first smoothing capacitor 201.

[0044] The live-side input terminal of the first rectifier-smoothing circuit 30 is connected to node N1 via live line 421. Node N1 is a terminal connected to the live line of the AC power supply 4.

[0045] The neutral input terminal of the first rectifier-smoothing circuit 30 is connected to node N2 via neutral line 422, node N3, and second connection line 452. Node N2 is the terminal connected to the neutral line of the AC power supply 4. The first connection line 451 is connected in parallel with the second connection line 452.

[0046] The first connection line 451 is provided with a first relay 38 and a current limiting resistor 33. The second connection line 452 is provided with a second relay 40. The first relay 38 and the second relay 40 are composed of mechanical relays, for example, having a coil section and a contact section.

[0047] The first relay drive circuit 37 controls the opening and closing operation of the first relay 38 based on the opening / closing signal 37a input from the first control circuit 36. When the first relay drive circuit 37 closes the first relay 38, the first connection line 451 becomes conductive. When the first relay drive circuit 37 opens the first relay 38, the first connection line 451 is shut off. The first relay 38 and the first relay drive circuit 37 constitute a first switching circuit that switches between conducting and shutting off the first connection line 451.

[0048] The second relay drive circuit 39 controls the opening and closing operation of the second relay 40 based on the opening / closing signal 39a input from the first control circuit 36. When the second relay drive circuit 39 closes the second relay 40, the second connection line 452 becomes conductive. When the second relay drive circuit 39 opens the second relay 40, the second connection line 452 is interrupted. The second relay 40 and the second relay drive circuit 39 constitute a second switching circuit that switches between conducting and interrupting the second connection line 452.

[0049] The live input terminal of the second rectifier-smoothing circuit 31 is connected to node N1 via the live line 431, and the neutral input terminal of the second rectifier-smoothing circuit 31 is connected to node N2 via the neutral line 432.

[0050] The operation display unit 2 includes a second control circuit 20, a communication circuit 21, a memory 22, a display unit 23, a start button 24, and an end button 25. The second control circuit 20 is connected to the first control circuit 36 ​​via a positive line 441 and a negative line 442. The second control circuit 20 is configured, for example, by a microcontroller. DC power is supplied to the second control circuit 20 from the AC power supply 4 via a second rectifier and smoothing circuit 31, a control circuit power supply 34, and the first control circuit 36. The communication circuit 21 is configured, for example, by a communication module compatible with any wireless communication standard such as Wi-Fi or Bluetooth (registered trademark). The memory 22 is configured, for example, by a semiconductor memory and stores control programs and data for controlling the washing machine 1. The display unit 23, start button 24, and end button 25 have been described above and will not be explained further.

[0051] Figures 3 to 5 are circuit diagrams of the first rectifier-smoothing circuit 30 and the second rectifier-smoothing circuit 31 in embodiments of the present disclosure. Figure 3 shows a voltage doubler circuit 601, Figure 4 shows a half-wave rectifier circuit 602, and Figure 5 shows a full-wave rectifier circuit 603. The voltage doubler circuit 601 is composed of two diodes D and two capacitors C. In the voltage doubler circuit 601, the output voltage is twice the peak value of the input AC voltage.

[0052] The half-wave rectifier circuit 602 is a circuit that rectifies only the positive half-wave of the input AC voltage and converts it into a DC voltage. The half-wave rectifier circuit 602 consists of one diode D and one capacitor C.

[0053] The full-wave rectifier circuit 603 is a circuit that rectifies both the positive and negative half-waves of an input AC voltage and converts them into a DC voltage. The full-wave rectifier circuit 603 consists of four diodes D arranged in a bridge configuration and one capacitor C.

[0054] Since a high voltage is required for the operation of the load 35, in this embodiment, the first rectifier-smoothing circuit 30 is composed of a voltage doubler circuit 601. When the first rectifier-smoothing circuit 30 is composed of a voltage doubler circuit 601, the first smoothing capacitor 201 is composed of two capacitors C. When the first rectifier-smoothing circuit 30 is composed of a voltage doubler circuit 601, the capacitance of the first smoothing capacitor 201 is the combined capacitance of the two capacitors C.

[0055] The DC voltage output from the full-wave rectifier circuit 603 has less ripple and a smoother DC voltage compared to the half-wave rectifier circuit 602 because all half-waves of the AC voltage are rectified. Therefore, in this embodiment, the second rectifier-smoothing circuit 31 is composed of the full-wave rectifier circuit 603. When the second rectifier-smoothing circuit 31 is composed of the full-wave rectifier circuit 603, the second smoothing capacitor 202 is composed of a single capacitor C.

[0056] However, these are just examples, and the first rectifier-smoothing circuit 30 may be composed of either a half-wave rectifier circuit 602 or a full-wave rectifier circuit 603. Also, the second rectifier-smoothing circuit 31 may be composed of either a voltage doubler circuit 601 or a half-wave rectifier circuit 602.

[0057] The half-wave rectifier circuit 602 consists of one diode D and one capacitor C, which has the advantage of a simple circuit configuration and a small number of components. Therefore, if the first rectifier and smoothing circuit 30 or the second rectifier and smoothing circuit 31 is configured with the half-wave rectifier circuit 602, the power supply control device 3 can be configured simply.

[0058] The washing machine 1 has an operating mode and a standby mode.

[0059] The operating mode is one in which DC power is supplied to the load 35 from the AC power supply 4 via the first rectifier-smoothing circuit 30, causing the load 35 to perform laundry-related operations. In the operating mode, the second control circuit 20 controls the load 35 according to setting information such as a course or menu selected by the user. As a result, laundry-related operations such as washing, rinsing, and spinning are performed in sequence. In the operating mode, the first control circuit 36 ​​and the second control circuit 20 are supplied with DC power from the AC power supply 4 via the second rectifier-smoothing circuit 31.

[0060] Standby mode is the state in which the washing machine 1 is in standby mode with low power consumption. In standby mode, the supply of DC power to the load 35 is stopped, while the supply of DC power to the first control circuit 36 ​​and the second control circuit 20 continues.

[0061] Thus, in both operating mode and standby mode, the supply of DC power to the first control circuit 36 ​​and the second control circuit 20 is continuous. In other words, the first control circuit 36 ​​and the second control circuit 20 are always powered. However, if the power plug of the washing machine 1 is unplugged from the outlet, or if the AC power supply 4 experiences a power outage, the power supply to the first control circuit 36 ​​and the second control circuit 20 is cut off.

[0062] [Explanation of operation] Next, we will explain the operation of washing machine 1 shown in Figure 2.

[0063] When the user presses the start button 24, the second control circuit 20 acquires a start button signal 24a indicating that the start button 24 has been pressed.

[0064] Upon receiving the start button signal 24a, the second control circuit 20 inputs a second control circuit signal 20a to the first control circuit 36, instructing it to transition from standby mode to operation mode.

[0065] Upon receiving the second control circuit signal 20a, the first control circuit 36 ​​inputs the switching signal 37a to the first relay drive circuit 37. Upon receiving the switching signal 37a, the first relay drive circuit 37 closes the first relay 38. As a result, the first connection line 451 conducts, and a current limited in magnitude by the current limiting resistor 33 is supplied to the first rectifier smoothing circuit 30, and this current starts charging the first smoothing capacitor 201. This suppresses the supply of inrush current to the first rectifier smoothing circuit 30 at the start of the operating mode.

[0066] The first control circuit 36 ​​obtains the detection result of the charging voltage of the first smoothing capacitor 201 from the voltage detection circuit (not shown in the figure).

[0067] When the first control circuit 36 ​​detects that the charging voltage of the first smoothing capacitor 201 is above a threshold, it inputs an open / close signal 39a to the second relay drive circuit 39. Upon receiving the open / close signal 39a, the second relay drive circuit 39 closes the second relay 40. As a result, the second connection line 452 conducts, and a current that is not limited by the current limiting resistor 33 is supplied to the first rectifier-smoothing circuit 30, and this current charges the first smoothing capacitor 201. As a result, the first smoothing capacitor 201 is rapidly charged, and the load 35 is started up quickly.

[0068] Next, the operation of the bypass circuit 32 will be explained.

[0069] In the operating mode, if the AC power supply 4 fails, the bypass circuit 32 supplies the power stored in the first smoothing capacitor 201 to the first control circuit 36 ​​and the second control circuit 20. Specifically, in the event of a power outage, the bypass circuit 32 forms a current path that returns from the first smoothing capacitor 201 to the first smoothing capacitor 201 via the diode 331, the second positive line 411, the first control circuit 36, the positive line 441, the second control circuit 20, the negative line 442, the second negative line 412, and the diode 332.

[0070] As a result, the power stored in the first smoothing capacitor 201 is supplied to the first control circuit 36 ​​and the second control circuit 20 via the bypass circuit 32. In the event of a power outage, the power stored in the second smoothing capacitor 202 is also supplied to the first control circuit 36 ​​and the second control circuit 20.

[0071] When a power outage occurs, the second control circuit 20 executes control to stop the load 35. For example, the second control circuit 20 executes brake control on the drive motor that makes up the load 35. The first control circuit 36, when it detects a power outage based on the detection result of the charging voltage of the first smoothing capacitor 201 by the voltage detection circuit (not shown), outputs a notification signal to the second control circuit 20 indicating the occurrence of a power outage. As a result, the second control circuit 20 can detect the occurrence of a power outage and start brake control.

[0072] Figure 6 is a graph illustrating the operation of the power control device 3 during a power outage in an embodiment of the present disclosure. In Figure 6, the first row is a waveform diagram of the input voltage 801 input from the AC power supply 4 to the second rectifier-smoothing circuit 31. The second row is a waveform diagram of the output voltage 802 of the second rectifier-smoothing circuit 31 when the bypass circuit 32 is not provided. The third row is a waveform diagram of the output voltage 803 of the second rectifier-smoothing circuit 31 when the bypass circuit 32 is provided.

[0073] At time T1, a power outage occurs. Therefore, the waveform of input voltage 801 is interrupted at this time. When a power outage occurs, the potential of output voltage 802 immediately drops, and its potential becomes 0 when period TA has elapsed from time T1. This is because the power supply for output voltage 802 is only the second smoothing capacitor 202.

[0074] In contrast, the decrease in potential of output voltage 803 after time T1 is significantly slower than that of output voltage 802. This is because, due to the provision of the bypass circuit 32, the power supply for output voltage 803 includes the first smoothing capacitor 201 in addition to the second smoothing capacitor 202. Therefore, the period TB from when a power outage occurs until the potential of output voltage 803 becomes 0 is significantly longer than the period TA.

[0075] [Effects, etc.] Thus, with the power control device 3, if the AC power supply 4 fails, the power stored in the first smoothing capacitor 201 is supplied to the first control circuit 36 ​​and the second control circuit 20 via the bypass circuit 32. As a result, the first control circuit 36 ​​and the second control circuit 20 can operate using the power stored in the first smoothing capacitor 201 in addition to the power stored in the second smoothing capacitor 202. Consequently, the power control device 3 can avoid a situation where the first control circuit 36 ​​and the second control circuit 20 immediately stop operating in the event of a power outage. This allows the power control device 3 to ensure that the first control circuit 36 ​​and the second control circuit 20 have a period of time to execute control to completely stop the load 35, thereby safely stopping the load 35.

[0076] Furthermore, according to the power control device 3, since the capacitance of the first smoothing capacitor 201 is greater than the capacitance of the second smoothing capacitor 202, more power is supplied to the first control circuit 36 ​​and the second control circuit 20 from the first smoothing capacitor 201 when the AC power supply 4 is shut off. As a result, the first control circuit 36 ​​and the second control circuit 20 can operate for a longer period of time.

[0077] Furthermore, according to the power control device 3, the first bypass circuit 321 and the second bypass circuit 322 ensure a current path that returns from the first smoothing capacitor 201 to the first rectifier-smoothing circuit 30 via the first control circuit 36 ​​and the second control circuit 20.

[0078] Furthermore, according to the power control device 3, since the first bypass circuit 321 and the second bypass circuit 322 include diodes 331 and 332, it is possible to suppress the energization of the load 35 when the load 35 is not operating.

[0079] Furthermore, according to the power control device 3, the bypass circuit 32 can be constructed at low cost using diodes 331 and 332.

[0080] Furthermore, according to the power control device 3, the first rectifier and smoothing circuit 30 is composed of a voltage doubler circuit 601, so it can supply the load 35 with the large voltage necessary for the operation of the load 35. The second rectifier and smoothing circuit 31 is composed of a full-wave rectifier circuit 603, so it can supply a DC voltage with little ripple to the first control circuit 36 ​​and the second control circuit 20.

[0081] Furthermore, according to the power control device 3, since the second rectifier and smoothing circuit 31 is directly connected to the AC power supply 4, the first control circuit 36 ​​and the second control circuit 20 can be kept energized at all times. On the other hand, since the first rectifier and smoothing circuit 30 is connected to the AC power supply 4 in response to a start command, the supply of power to the load 35 when the load 35 is in standby mode is suppressed. As a result, the power control device 3 can reduce power consumption while keeping the first control circuit 36 ​​and the second control circuit 20 energized at all times.

[0082] The following modifications may be adopted for this disclosure.

[0083] (First variation) Figure 7 is a circuit diagram of a washing machine 1A in a first modified embodiment of the present disclosure. The washing machine 1A further comprises a third rectifier-smoothing circuit 701, a load 702, and a bypass circuit 32A compared to the washing machine 1. The first rectifier-smoothing circuit 30 and the third rectifier-smoothing circuit 701 are examples of a plurality of first rectifier-smoothing circuits. The load 35 and the load 702 are examples of a plurality of loads. The bypass circuit 32A is an example of a plurality of bypass circuits corresponding to a plurality of rectifier-smoothing circuits.

[0084] The third rectifier-smoothing circuit 701 includes a third smoothing capacitor 203 and is connected between the AC power supply 4 and the load 702. Specifically, the third rectifier-smoothing circuit 701 is connected to node N1 via live line 461 and to node N3 via neutral line 462. The third rectifier-smoothing circuit 701 is connected to the load 702 via a third positive line 501 and a third negative line 502.

[0085] The third rectifier and smoothing circuit 701 rectifies and smooths the AC power output by the AC power supply 4, converting the AC power into DC power, and supplies the converted DC power to the load 702. In other words, the load 702 is a rectifier and smoothing circuit for the load.

[0086] Bypass circuit 32A includes a third bypass circuit 711 and a fourth bypass circuit 712 in addition to the first bypass circuit 321 and the second bypass circuit 322. The third bypass circuit 711 is connected between the third positive line 501 and the second positive line 411. The fourth bypass circuit 712 is connected between the third negative line 502 and the second negative line 412.

[0087] The third bypass circuit 711 includes a diode 721. The anode of diode 721 is connected to the third positive line 501, and the cathode is connected to the second positive line 411.

[0088] The fourth bypass circuit 712 includes a diode 722. The anode of the diode 722 is connected to the second negative line 412, and the cathode is connected to the third negative line 502.

[0089] If the AC power supply 4 fails, the bypass circuit 32A supplies the power stored in the first smoothing capacitor 201 and the third smoothing capacitor 203 to the first control circuit 36 ​​and the second control circuit 20.

[0090] Load 702 includes a drive motor and is a device for realizing a different function from load 35. For example, if load 35 is a load for realizing a washing function, then load 702 is a load for realizing a drying function. However, this is just an example, and load 702 may be a load for realizing the same function as load 35. For example, if there are two drive motors for realizing a washing function, load 35 may be made up of one drive motor and load 702 may be made up of the other drive motor.

[0091] Thus, with the power control device 3A, in addition to the power stored in the first smoothing capacitor 201, the power stored in the third smoothing capacitor 203 is also supplied to the first control circuit 36 ​​and the second control circuit 20. Therefore, in the event of a power outage, the first control circuit 36 ​​and the second control circuit 20 can be operated for a longer period of time.

[0092] (Second variation) Bypass circuits 32 and 32A are composed of diodes, which are an example of active elements, but this is just an example, and they may be composed of active elements other than diodes. Examples of active elements other than diodes include parasitic diodes of MOSFETs, MOSFETs, transistors, and relays. When bypass circuits 32 and 32A are composed of switching elements such as MOSFETs, transistors, and relays, bypass circuit 32 is switched on and off by the first control circuit 36. That is, when the first control circuit 36 ​​detects a power outage, it turns on the switching elements. As a result, the power stored in the first smoothing capacitor 201 is supplied to the first control circuit 36 ​​and the second control circuit 20 via the switching elements.

[0093] (Third variation) Bypass circuits 32 and 32A may be composed of passive elements. Passive elements include, for example, resistors, PTC elements, and inductors. In particular, when the output voltages of the first rectifier / smoothing circuit 30 and the second rectifier / smoothing circuit 31 are 1:1, the bypass circuit 32 may be composed of passive elements. Also, when the output voltages of the first rectifier / smoothing circuit 30, the second rectifier / smoothing circuit 31, and the third rectifier / smoothing circuit 701 are 1:1:1, the bypass circuit 32A may also be composed of passive elements.

[0094] (Fourth variation) The first bypass circuit 321 and the second bypass circuit 322 are both composed of diodes, but the disclosure is not limited thereto. For example, one of the first bypass circuit 321 and the second bypass circuit 322 may be composed of active elements and the other of the other of passive elements. Alternatively, only one of the first bypass circuit 321 and the second bypass circuit 322 may have active or passive elements, and the other may be short-circuited.

[0095] (Fifth variation) The power control device 3A shown in Figure 7 is equipped with two loads 35 and 702, but the number of loads may be three or more. In this case, the power control device 3A may be equipped with three or more rectifier and smoothing circuits corresponding to each of the three or more loads. Furthermore, in this case, the bypass circuit 32A may be equipped with a bypass circuit that connects each load to the second positive line 411 and the second negative line 412. For example, if the number of loads is n, the bypass circuit 32 may be equipped with n-1 sets of bypass circuits. For example, the i-th set of bypass circuits consists of a bypass circuit (e.g., a first bypass circuit 321) that allows current to flow from the smoothing capacitor of the i-th rectifier and smoothing circuit to the second positive line 411, and a bypass circuit (e.g., a second bypass circuit 322) that allows current from the second negative line 412 to flow to the smoothing capacitor.

[0096] (Sixth variation) This disclosure may also be applied to electrical equipment other than washing machines. Any electrical equipment comprising multiple loads and multiple rectifier / smoothing circuits corresponding to those loads is applicable. Other examples of electrical equipment include air conditioners, dishwashers, and air purifiers. In the case of air conditioners and air purifiers, the load is, for example, the drive motor of a heat pump. In the case of a dishwasher, the load is, for example, the drive motor of the dishwasher. The load may also be an inverter.

[0097] Since the embodiments described above are for illustrative purposes only, various modifications, substitutions, additions, omissions, etc., can be made within the claims or their equivalents. [Industrial applicability]

[0098] This disclosure is applicable to electrical equipment such as washing machines that have separate rectifier and smoothing circuits for load and control. [Explanation of symbols]

[0099] 1: Washing machine 2: Operation display section 3: Power supply control device 4: AC power supply 20: Second control circuit 30: 1st rectifier smoothing circuit 31:Second rectifier smoothing circuit 32: Bypass Circuit 33: Current limiting resistor 34: Control circuit power supply 35: Load 36: First control circuit 37: First relay drive circuit 38: 1st Relay 39: Second relay drive circuit 40: 2nd Relay 201: First smoothing capacitor 202: Second smoothing capacitor 321: First Bypass Circuit 322: Second Bypass Circuit 331: Diode 332: Diode 401: First positive side line 402: First negative line 411: Second positive side line 412: Second negative line

Claims

1. A power control device for electrical equipment, A first rectifier-smoothing circuit, including a first smoothing capacitor, is connected between the AC power supply and the load. A second rectifier-smoothing circuit, which includes a second smoothing capacitor and is connected between the AC power supply and the control circuit that controls the load, The system includes a bypass circuit connected between the output side of the first rectifier-smoothing circuit and the output side of the second rectifier-smoothing circuit. Power supply control device.

2. The capacitance of the first smoothing capacitor is greater than the capacitance of the second smoothing capacitor. The power control device according to claim 1.

3. A first positive line and a first negative line are connected between the first rectifier-smoothing circuit and the load, The circuit further comprises a second positive line and a second negative line connected between the second rectifier-smoothing circuit and the control circuit, The bypass circuit is A first bypass circuit connected between the first positive line and the second positive line, A second bypass circuit connected between the first negative line and the second negative line, The power control device according to claim 1 or 2.

4. At least one of the first bypass circuit and the second bypass circuit includes an active element. The power control device according to claim 3.

5. The active element is a diode. The power control device according to claim 4.

6. The first rectifier-smoothing circuit is composed of a voltage doubler circuit. The aforementioned second rectifier-smoothing circuit is composed of a full-wave rectifier circuit. The power control device according to claim 1 or 2.

7. The system further includes a startup circuit that connects the AC power supply and the first rectifier / smoothing circuit in response to a startup command. The second rectifier and smoothing circuit is directly connected to the AC power supply. The power control device according to claim 1 or 2.

8. The first rectifier-smoothing circuit includes a plurality of rectifier-smoothing circuits, each including a smoothing capacitor. The load includes a plurality of loads corresponding to the plurality of rectifier and smoothing circuits, The bypass circuit includes a plurality of bypass circuits corresponding to the plurality of rectifier and smoothing circuits, The power control device according to claim 1 or 2.

9. A washing machine comprising a power control device according to claim 1 or 2.

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