JP2017093100A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of suppressing an instantaneous stop of an electric device even when an instantaneous voltage drop occurs in electric power supplied from a battery.SOLUTION: In an electric power supply system 1 comprising an electric device 20 and a battery 10 for supplying DC power to the electric device 20, the electric device 20 includes a drive circuit 21 which is connected to the battery 10 and drives the electric device, a control circuit 22 which is connected to the battery 10 in parallel with the drive circuit 21 to control the operation of the drive circuit 21, and power supply means 23 for supplying the control circuit 22 with electric power for operating the control circuit 22 when an instantaneous voltage drop occurs in the electric power supplied from the battery 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system that supplies power from a battery to an electrical device.

  As a technique for supplying electric power to an electric device, a technique for supplying electric power from a battery in a direct current is known. When the input voltage for driving the electric device is a direct current, the efficiency is higher than in the case of the alternating current, and thus the electric device can be driven at a low voltage. Therefore, the power supply system that supplies power with direct current can suppress power consumption.

  As an example of this type of power supply system, Patent Document 1 discloses a technique for storing electricity generated by a power generation device in a battery and supplying power from the battery to an electric device having a compressor or the like.

JP 2010-119225 A

  However, in the power supply system disclosed in Patent Document 1, when an electric device having a large load is started to be driven or when an overload is suddenly applied during operation, an inrush current to the electric device is caused. An instantaneous voltage drop may occur. When the instantaneous voltage drop occurs, the electric device stops instantaneously, and the electric device may malfunction due to, for example, resetting a timer in the electric device.

  Therefore, the present invention provides a power supply system that can suppress an instantaneous stop of an electric device.

  One aspect of a power supply system for solving the above problems is a power supply system including an electric device and a battery that supplies electric power to the electric device with a direct current, and the electric device is connected to the battery and is electrically connected. A drive circuit that drives the device, a control circuit that is connected to the battery in parallel with the drive circuit and controls the operation of the drive circuit, and for operating the control circuit when an instantaneous voltage drop occurs in the power supplied from the battery Power supply means for supplying the power to the control circuit.

  Another aspect of the power supply system for solving the above problem is an electric power supply system including an electric device and a battery that supplies electric power to the electric device with a direct current. A battery having a drive circuit for driving the device and a control circuit for controlling the operation of the drive circuit. The battery is composed of two or more batteries, a battery for supplying power to the drive circuit, and a battery for supplying power to the control circuit. And are separate.

  An instantaneous stop of the electric device can be suppressed.

1 is a circuit diagram of a power supply system according to Embodiment 1. FIG. FIG. 2 is a circuit diagram of a power supply system according to a modification of the first embodiment. FIG. 3 is a circuit diagram of the power supply system according to the second embodiment. FIG. 4 is a circuit diagram of the power supply system according to the third embodiment. FIG. 5 is a configuration diagram of a power supply system according to the fourth embodiment. FIG. 6 is a diagram illustrating a connection relationship of each component of the power supply system according to the fifth embodiment. FIG. 7 is a diagram illustrating a connection relationship of each component of the power supply system according to the modification of the fifth embodiment.

  Hereinafter, a power supply system according to an embodiment will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangement positions, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

  Further, in the following embodiments, “connected” means electrically connected, and not only directly connected but also indirectly through other electric elements or the like. This includes cases where they are connected.

(Embodiment 1)
As shown in FIG. 1, the power supply system 1 according to the present embodiment includes an electric device 20 and a battery 10 that supplies electric power to the electric device 20 with a direct current.

  The battery 10 is a secondary battery provided outside the electric device 20. The battery 10 is charged using, for example, a solar power generation device or an AC power source (commercial AC power source). The stored electricity is supplied to the electric device 20 with a direct current.

  The electric device 20 in the present embodiment is a device that is driven when a DC voltage is input. Examples of the electric device 20 include an air conditioner, a microwave oven, and a lighting device. The electrical device 20 includes a drive circuit 21 that drives a main drive source (for example, a motor) of the electrical device 20, a control circuit 22 that controls the operation of the drive circuit 21, and a power supply unit that supplies power to the control circuit 22. 23. The drive circuit 21 and the control circuit 22 are connected to the battery 10 in parallel with each other. Note that before the electric device 20 is driven, power is not supplied to the drive circuit 21 and the control circuit 22.

  The drive circuit 21 includes a transformer T, a switch Q1 connected to the GND side of the transformer T, and an operation start switch 25 (S1) that controls the operation start of the drive circuit 21. The operation start switch 25 is provided between the plus side of the connection point p where the drive circuit 21 and the control circuit 22 are connected in parallel and the transformer T (primary side). The ON / OFF operation of the switch Q1 and the operation start switch 25 is controlled by the control circuit 22. A relatively large load such as a main drive source of the electric device 20 is connected to the secondary side of the transformer T (not shown).

  The control circuit 22 includes a semiconductor element that controls the operation of the drive circuit 21 (not shown). Note that a diode D1 is provided between the positive connection point p and the control circuit 22 to prevent a reverse current flow.

  The power supply unit 23 is a unit that supplementarily supplies power to the control circuit 22 when an instantaneous voltage drop occurs in the power supplied from the battery 10. As the power supply means 23, for example, a capacitor 24 such as an electrolytic capacitor is used. The capacitor 24 is closer to the control circuit 22 than the connection point p between the drive circuit 21 and the control circuit 22 and the diode D1, and is connected in parallel to the control circuit 22. The capacitor 24 is charged with an amount of electricity necessary to operate the control circuit 22 when an instantaneous voltage drop occurs. The charging capacity of the capacitor 24 is appropriately determined according to the allowable voltage drop time.

  Here, the circuit operation of the power supply system 1 will be described. Note that, as a case where the instantaneous voltage drop occurs, a case where the driving of the electric device 20 is started will be described as an example.

  First, when a drive command to start driving the electrical device 20 is received, power is supplied from the battery 10 to the drive circuit 21 and the control circuit 22. At that time, the control circuit 22 delays the rise of the drive circuit 21. Specifically, the operation start switch 25 of the drive circuit 21 is not turned on for a predetermined time, but is turned off (opened). This creates a situation where the power from the battery 10 is not supplied to the drive circuit 21 side but to the control circuit 22 side, and charges the capacitor 24 with electricity. The predetermined time is determined to be a time during which the amount of electricity necessary for the capacitor 24 to operate the control circuit 22 later can be sufficiently stored. This predetermined time is, for example, 1 second.

  Next, after a predetermined time has elapsed, the operation start switch 25 is turned on (short circuit) to supply power to the drive circuit 21. Since a load is provided on the drive circuit 21 side, an instantaneous voltage drop occurs in the power supplied from the battery 10 at this time. However, in the present embodiment, the capacitor 24 has already been charged with sufficient electricity by the above operation of the control circuit 22, so that power is supplementally supplied to the control circuit 22 using the charged electricity.

  In other words, in the power supply system 1 according to the present embodiment, the power supply means 23 including the capacitor 24 prevents the power supply to the control circuit 22 from being interrupted. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

  In the above description, the instantaneous voltage drop when starting driving the electric device 20 has been described as an example. However, the present embodiment is also applied to the instantaneous voltage drop that occurs suddenly during steady operation. it can. For example, the instantaneous voltage drop during steady operation is detected, the rise of the drive circuit 21 is delayed using the detection information as a trigger, and thereafter the circuit operation is executed in the same manner, thereby suppressing the instantaneous stop of the electric device 20. it can.

  The present embodiment can also be applied to the case where power is supplied to a plurality of electrical devices 20 using a single battery 10. For example, when one electrical device 20 is driven and an instantaneous voltage drop occurs, information on the instantaneous voltage drop is transmitted to the other electrical device 20, and the other electrical device 20 is transmitted based on the transmitted information. The similar circuit operation may be executed.

  FIG. 2 is a circuit diagram showing a modification of the power supply system 1. In the power supply system 1A in the modified example, an FET (field effect transistor) is used as the operation start switch 25 (S1) in the drive circuit 21.

  In the power supply system 1A, when driving the electric device 20 is started, the operation start switch 25 is used to control the current in the drive circuit 21 to gradually increase from zero, thereby delaying the rise of the drive circuit 21. Due to the delay of the rise, sufficient electricity is stored in the capacitor 24 on the control circuit 22 side. Therefore, even when an instantaneous voltage drop occurs, power is supplementally supplied from the power supply means 23 including the capacitor 24 to the control circuit 22. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

(Embodiment 2)
FIG. 3 is a circuit diagram of a power supply system 1B according to the second embodiment. In the power supply system 1B, a booster circuit 26 is used as the power supply means 23. Note that a power supply IC including the booster circuit 26 may be used as the power supply means 23.

  The booster circuit 26 is provided closer to the control circuit 22 than the connection point p between the drive circuit 21 and the control circuit 22 and the diode D1. The booster circuit 26 is connected in parallel to the control circuit 22 between the coil L connected to the diode D1, the diode D3 provided between the coil L and the control circuit 22, and the coil L and the diode D3. And a switch Q2. The switch Q2 is configured to be repeatedly turned ON / OFF at a predetermined frequency (for example, 10 KHz) by an operational amplifier or a comparator (not shown). The operation of the booster circuit 26 supplies power to the control circuit 22.

  A diode D2 is provided between the plus side of the connection point p of the drive circuit 21 and the transformer T, instead of the operation start switch 25 shown in the first embodiment.

  In the present embodiment, even if an instantaneous voltage drop occurs when driving the electric device 20, a current flows to the control circuit 22 side due to the magnetic energy stored in the coil L of the booster circuit 26, and the control circuit 22 Power is supplied. That is, the booster circuit 26 prevents the power supply to the control circuit 22 from being interrupted. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

  In the present embodiment, by providing the diode D2 instead of the operation start switch 25, the instantaneous stop of the electric device 20 can be suppressed without delaying the rise of the drive circuit 21.

(Embodiment 3)
FIG. 4 is a circuit diagram of a power supply system 1C according to the third embodiment. In the power supply system 1C, when the drive circuit 21 is started to operate, the current supplied to the drive circuit 21 is made smaller than that during steady operation.

  In the power supply system 1 </ b> C, a variable current device 27 (corresponding to the power supply means 23) is provided between the connection point sp and the drive circuit 21. Examples of the current variable device 27 include an FET or a variable resistor.

  Then, by controlling the current variable device 27 when driving the electric device 20 is started, the current supplied to the drive circuit 21 is temporarily made smaller than the current supplied during steady operation. In addition, sufficient power is supplied to the control circuit 22 by temporarily reducing the current supplied to the drive circuit 21. The steady operation means when the main drive source of the electric device 20 is driven. Further, the current smaller than that during the steady operation is, for example, a current of 0% or more and 99% or less during the steady operation.

  In the present embodiment, when the electric device 20 is started to be driven, that is, when an instantaneous voltage drop occurs, the current supplied to the drive circuit 21 is reduced using the current variable device 27. Thereby, a rapid change in current is suppressed, and a voltage drop in power supplied to the drive circuit 21 and the control circuit 22 is suppressed. Further, by reducing the current supplied to the drive circuit 21, a sufficient current flowing through the control circuit 22 is ensured, and the operation stop of the control circuit 22 is suppressed. As a result, the instantaneous stop of the electric device 20 can be suppressed.

(Embodiment 4)
FIG. 5 is a configuration diagram of a power supply system 1D according to the fourth embodiment. In the power supply system 1D, the battery 10 is composed of two batteries 11 and 12.

  The electric device 20 in the present embodiment is a device that is driven when a DC voltage is input. The electrical device 20 includes a drive circuit 21 that drives the main drive source of the electrical device 20 and a control circuit 22 that controls the operation of the drive circuit 21.

  The drive circuit 21 includes a transformer and a switch connected to the GND side of the transformer. The switch is controlled to be turned ON / OFF by the control circuit 22. A relatively large load (for example, a motor) is connected to the secondary side of the transformer (not shown). The control circuit 22 includes a semiconductor element that controls the operation of the drive circuit 21 (not shown).

  The batteries 11 and 12 are secondary batteries provided outside the electric device 20. The battery 11 is connected to the drive circuit 21 and supplies power to the drive circuit 21. The battery 12 is connected to the control circuit 22 and supplies power to the control circuit 22. The GND (ground) of these batteries 11 and 12 is connected in common. The voltage values of the batteries 11 and 12 may be the same or different. Further, when the electric device 20 includes a plurality of drive circuits 21 or a plurality of control circuits 22, a plurality of batteries 11 or a plurality of batteries 12 may be provided so as to correspond to each circuit on a one-to-one basis.

  In the power supply system 1D according to the present embodiment, the battery 11 that supplies power to the drive circuit 21 and the battery 12 that supplies power to the control circuit 22 are separate. Thus, even when a voltage drop occurs in the battery 11 that supplies power to the drive circuit 21, the control circuit 22 can be operated using the battery 12 that supplies power to the control circuit 22. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

(Embodiment 5)
FIG. 6 is a diagram illustrating a connection relationship of each component of the power supply system 1E according to the fifth embodiment. The form regarding the battery 10 and the electric equipment 20 is the same as the form shown in Embodiment 1. In the present embodiment, a method for storing power in the battery 10 will be described.

  The power supply system 1E is configured to store in the battery 10 using, for example, a power generation device 41 using sunlight and an AC power source (commercial AC power source) 42 laid in a building. An AC-DC converter 43 is provided between the AC power supply 42 and the battery 10 to convert alternating current into direct current and store the power.

  Here, an example of a power storage method using the power supply system 1E will be described.

  In a normal power supply system that uses the power generation device 41 to store electricity, the remaining capacity of the battery 10 decreases when the situation in which electricity cannot be stored due to circumstances such as the weather is prolonged. In that case, power is stored using the AC power source 42. However, if the battery 10 is stored up to the maximum capacity, it cannot be stored when the power generation device 41 can store power, and the power generation device 41 cannot be effectively used. There is a problem.

  Therefore, in the present embodiment, when the AC power source 42 is used, the battery 10 is not fully charged and is charged with a free capacity, and when the power generation device 41 can store power, the power generation device 41 is used. Electricity is stored.

  Specifically, when the battery 10 reaches a predetermined remaining capacity, power storage is started using the AC power source 42. This predetermined remaining capacity is appropriately determined based on the daily power consumption. For example, when the daily power consumption is 1.15 kW, when the remaining capacity of the battery 10 is less than 1.15 kW in terms of power, storage by the AC power source 42 is started. Then, when the remaining capacity of the battery 10 that is being stored reaches a predetermined threshold value, the storage by the AC power source 42 is interrupted. For example, the threshold value is a value obtained by adding 10% of the maximum capacity of the battery 10 to the capacity conversion value of the daily power consumption. If the daily power consumption is equivalent to 1.15 kW and the maximum capacity of the battery 10 is 3 kW, the threshold value is 1.45 kW. When the power generation device 41 can store power, the power generation device 41 is used to store up to 3 kW.

  By adopting such a power storage method in the power supply system 1E, it is possible to store power in the battery 10 with the power generation device 41 as a main component rather than the AC power source 42. As a result, it is possible to effectively use the power generation device 41 and reduce power consumption using the AC power source 42 as a supply source. Further, as described in the first embodiment, the instantaneous stop of the electric device 20 can be suppressed.

  Further, when the capacity of the battery 10 being used is close to a predetermined remaining capacity, the AC power source 42 is urged by reducing the power used by the electric device 20 or by alerting the surroundings by blinking a lamp or the like. As a result, the chance of storing electricity can be reduced. Thereby, power consumption using the AC power source 42 as a supply source can be reduced.

  FIG. 7 is a diagram illustrating a modification of the power supply system 1F. In the power supply system 1F, as shown in the fourth embodiment, power is supplied to each of the drive circuit 21 and the control circuit 22 of the electric device 20 using two batteries 11 and 12. The batteries 11 and 12 are charged using the power generation device 41 and the AC power source 42. According to this configuration, it is possible to suppress an instantaneous stop of the electric device 20 and to reduce power consumption using the AC power source 42 as a supply source.

(Summary)
The power supply systems 1, 1A, 1B, 1C, and 1E according to the first, second, third, and fifth embodiments include the electric device 20 and a battery that supplies electric power to the electric device 20 with a direct current. A drive circuit 21 that is connected to the battery 10 and drives the electric device 20; a control circuit 22 that is connected to the battery in parallel with the drive circuit 21 and controls the operation of the drive circuit 21; and an instantaneous voltage applied to the power supplied from the battery 10 The power supply means 23 supplies power for operating the control circuit 22 to the control circuit 22 when a decrease occurs.

  According to this configuration, even when an instantaneous voltage drop occurs in the power supplied from the battery 10, it is possible to suppress the operation stop of the control circuit 22 and to suppress the instantaneous stop of the electric device 20.

  Further, as shown in the first embodiment, the power supply means 23 is on the control circuit 22 side of the connection point p between the drive circuit 21 and the control circuit 22 and is connected in parallel with the control circuit 22. When the drive circuit 21 is operated, the control circuit 22 causes the capacitor 24 to charge the amount of electricity necessary for operating the control circuit 22, and when the instantaneous voltage drop occurs, the control circuit 22 You may make it supply electric power from.

  According to this configuration, even when an instantaneous voltage drop occurs, the control circuit 22 can be operated using electricity charged in the capacitor 24. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

  Further, as shown in the first embodiment, the drive circuit 21 includes an operation start switch 25 that controls the start of operation of the drive circuit 21, and the control circuit 22 operates so as to delay the rise of the drive circuit 21. The start switch 25 may be operated to charge the capacitor 24 from the battery 10.

  According to this configuration, even when an instantaneous voltage drop occurs, the capacitor 24 can be charged before the drive circuit 21 starts up, and the control circuit 22 can be operated using the charged electricity. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

  Further, as shown in the second embodiment, the power supply means 23 is a booster circuit 26 provided on the control circuit 22 side with respect to the connection point p between the drive circuit 21 and the control circuit 22. When an instantaneous voltage drop occurs, power may be supplied to the control circuit 22.

  According to this configuration, the control circuit 22 can be operated using the booster circuit 26 even when an instantaneous voltage drop occurs. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

  In addition, as shown in the third embodiment, the power supply means 23 supplies power to the control circuit 22 by reducing the current supplied to the drive circuit 21 when operating the drive circuit 21 than in the steady operation. You may make it supply.

  According to this configuration, it is possible to make it difficult for the voltage supplied from the battery 10 to decrease when the drive circuit 21 is operated. In addition, power can be supplied to the control circuit 22 by reducing the current supplied to the drive circuit 21. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

  Electric power supply systems 1D and 1F according to modifications of the fourth embodiment and the fifth embodiment include an electric device 20 and a battery 10 that supplies electric power to the electric device 20 with a direct current, and the electric device 20 is an electric device. The battery 10 includes a drive circuit 21 that drives the drive circuit 20 and a control circuit 22 that controls the operation of the drive circuit 21. The battery 10 includes two or more batteries 11 and 12. The battery 11 supplies power to the drive circuit 21. The battery 12 supplying power to the control circuit 22 is separate.

  According to this configuration, even when an instantaneous voltage drop occurs in the battery 11 that supplies power to the drive circuit 21, the control circuit 22 can be operated using the battery 12 that supplies power to the control circuit 22. As a result, the operation stop of the control circuit 22 can be suppressed, and the instantaneous stop of the electric device 20 can be suppressed.

  As mentioned above, although the electric power supply system was demonstrated based on embodiment, this invention is not limited to said embodiment. For example, it is realized by arbitrarily combining the components and functions in the embodiments that are obtained by making various modifications conceived by those skilled in the art to the above-described embodiments, and without departing from the spirit of the present invention. Forms are also included in the present invention.

  For example, the battery may be a battery mounted on an automobile. The battery is not limited to a secondary battery, and may be a primary battery. The power generation device may be a solar power generation device, a wind power generation device, or a power generation device using a fuel cell.

  Further, the driving circuit may be an insulating circuit as shown in Embodiment 1 or 2, or may be a non-insulating circuit as shown in Embodiment 3.

1, 1A, 1B, 1C, 1D, 1E, 1F Power supply system 10, 11, 12 Battery 20 Electrical equipment 21 Drive circuit 22 Control circuit 23 Power supply means 24 Capacitor 25 Operation start switch 26 Booster circuit 27 Current variable device 41 Power generation Device 42 AC power supply 43 AC-DC converter p Connection point of drive circuit and control circuit

Claims (6)

An electric power supply system comprising an electric device and a battery for supplying electric power to the electric device with a direct current,
The electrical device includes a drive circuit connected to the battery and driving the electrical device, a control circuit connected to the battery in parallel with the drive circuit and controlling the operation of the drive circuit, and electric power supplied from the battery And a power supply unit that supplies power for operating the control circuit to the control circuit when an instantaneous voltage drop occurs. The power supply means includes a capacitor on the control circuit side than a connection point between the drive circuit and the control circuit, and connected in parallel with the control circuit,
The control circuit charges the capacitor from the battery with an amount of electricity necessary to operate the control circuit when operating the drive circuit, and when the instantaneous voltage drop occurs, power is output from the capacitor. The power supply system according to claim 1. In the drive circuit, having an operation start switch for controlling the operation start of the drive circuit,
The power supply system according to claim 2, wherein the control circuit operates the operation start switch so as to delay the rise of the drive circuit, and charges the capacitor from the battery. The power supply means is a booster circuit provided on the control circuit side with respect to a connection point between the drive circuit and the control circuit,
The power supply system according to claim 1, wherein the booster circuit supplies power to the control circuit when the instantaneous voltage drop occurs. The power supply system according to claim 1, wherein the power supply unit supplies power to the control circuit by making a current supplied to the drive circuit smaller than that during steady operation when operating the drive circuit. . An electric power supply system comprising an electric device and a battery for supplying electric power to the electric device with a direct current,
The electrical device has a drive circuit that drives the electrical device, and a control circuit that controls the operation of the drive circuit,
The battery includes two or more batteries, and the battery that supplies power to the drive circuit and the battery that supplies power to the control circuit are separate.

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