JP3578145B2 - Power supply - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, for example, in a normal state, a load can be driven by an output after rectification from a commercial AC power supply (AC), and in an abnormal state such as a power failure, the load can be driven by an output from a DC power supply such as a secondary battery. The present invention relates to a power supply device capable of easily and quickly configuring an uninterruptible dual power supply device. In particular, the present invention can be diverted to an uninterruptible dual power supply used to operate devices with high importance, such as crime prevention, disaster prevention, communication, information (server computer, FA personal computer, etc.), medical precision machines and automatic machines. Regarding power supply. Here, a power failure refers to a power supply (current) supply being cut off, for example, when the power supply from a power company is cut off, a breaker is dropped, an outlet is disconnected, or the power supply is cut off or the like. We will refer to cases such as when we are cut off.
[0002]
[Prior art]
When the above power supply device is used in, for example, a server computer, there is a demand for 24 hours and 5 years of continuous non-stop operation. Therefore, it is necessary to configure an uninterruptible dual power supply device. In the case of a personal computer (personal computer) or the like, the necessity of an uninterruptible dual power supply is low due to a problem such as an increase in cost. However, users need a low-cost power supply that can be used only when the commercial AC power supply is normal, that is, only during normal times, and an uninterruptible dual power supply that can use the equipment even during abnormalities such as power outages. Currently, two types of power supply devices are manufactured because of the need for the devices.
Further, a power supply device different from the uninterruptible dual power supply device that can cope with a power failure, that is, a power supply device having an additional output terminal for outputting a desired voltage may be required. In addition to the power supply device, a total of three or more types of power supply devices will be manufactured.
[0003]
[Problems to be solved by the invention]
When three or more types of power supply devices are manufactured as described above, not only the manufacturing cost increases, but also the storage cost after the manufacturing increases as the types increase.
As the uninterruptible dual power supply, for example, the one shown in FIG. 6 is conventionally known. This comprises a rectifier circuit 4 connected to the commercial AC power supply 1, an active filter circuit 5, a switching element 8 for supplying a voltage to the secondary side drive circuit B via the high frequency transformer 2, a gate circuit 7, and the like. Side drive circuit A, a secondary battery 3 composed of a battery or the like connected to the secondary side drive circuit B, and a single unit for stepping down to obtain three types of DC voltages to the load 14 by stepping down. And three DC-DC converters 50 connected in parallel to the secondary drive circuit B. In the figure, 11 is a rectifying diode, 12 is a smoothing choke coil, and 13 is a smoothing capacitor.
According to the above-described configuration, the secondary drive circuit B is not only complicated and large in size because the secondary battery 3 and the three DC-DC converters 50 are connected to the single secondary drive circuit B. If the DC-DC converter 50 breaks down, there is also a disadvantage that it is not possible to take out the DC voltage at a location output via the DC-DC converter 50 even in a normal state (normal state).
Since the DC-DC converter 50 is interposed, the efficiency of the primary-side switching power supply circuit is 75 to 80% and the efficiency of the secondary-side DC-DC converter 50 is 75 to 80%. Since the total efficiency is obtained, there is a disadvantage that energy loss becomes a problem.
[0004]
In view of the above situation, the present invention seeks to solve the problem by assembling a power supply device that can achieve high efficiency and downsizing and has various functions, not to mention the assembly work surface. Another object of the present invention is to provide a power supply device that is advantageous in terms of cost.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the power supply device of the present invention includes a rectifier circuit for rectifying AC from a commercial AC power supply and a power supply circuit including a switching element provided on the output side of the rectifier circuit and the like. DC power supply connected to a secondary winding of the high-frequency transformer, and a secondary-side DC output circuit for supplying power to a load is connected to the secondary winding of the high-frequency transformer. The circuit is provided with a connection part capable of connecting and disconnecting them, and the power supply circuit, the primary winding, the secondary DC output circuit, the secondary winding, the tertiary winding, and the circuit components are generated from the circuit components. An AC drive side unit is constituted by a first radiating fin or the like for releasing heat to be generated, and a DC power supply circuit unit is constituted by a second radiating fin or the like for releasing heat generated from the DC power supply circuit and the circuit component. , The connection It is characterized in that a heat conduction means to the first heat radiating fin to the heat conduction with each other of the second heat radiation fin and the AC driving-side unit of the DC power supply circuit unit connected state via.
As described above, the primary-side power supply circuit, the secondary-side DC output circuit, and the tertiary-side DC power supply circuit to which the commercial AC power supply is applied must be connected in a completely insulated state via a high-frequency transformer. Thereby, each circuit can be simplified. In addition, by providing a DC power supply circuit to which a secondary battery such as a battery is connected on the tertiary side, the output voltage on the secondary side can be changed only by changing the number of turns of the secondary side winding with respect to the high frequency transformer. Therefore, it is not necessary to connect a plurality of step-down circuits such as a plurality of DC-DC converters to a single secondary drive circuit as in the related art to form different output voltages. Also, by providing a tertiary winding and a DC power supply circuit separate from the power supply circuit with a connection portion that can connect and disconnect them, various DC power supply circuits configured as necessary can be connected to the tertiary winding. Common AC drive, such as configuring an uninterruptible redundant power supply simply by connecting to the line connection, or configuring a power supply that can output other output voltages of different magnitudes to the secondary side A desired power supply device can be obtained only by connecting the various DC power supply circuits to the side unit as needed.
Further, when the DC power supply circuit unit is connected to the AC drive side unit, the second heat radiation fin of the DC power supply circuit unit and the first heat radiation fin of the AC drive side unit are brought into a heat conducting state by heat conduction means. Thereby, the heat radiation area can be dramatically increased. In particular, in the case of an uninterruptible dual power supply device, when the secondary drive circuit is being driven by the AC drive unit, no current flows through the DC power supply circuit unit. The second radiating fin in the unused state of the power supply circuit unit can be effectively used as a radiating fin that emits heat generated from circuit components of the AC drive side unit. Further, even when a power supply device capable of outputting another output voltage having a different magnitude to the secondary side is configured, in a state where the other output voltage is not used, the case of the uninterruptible dual power supply device is not used. Similarly, the second radiating fin in the unused state can be used as a radiating fin that emits heat generated from circuit components of the AC drive side unit. In addition, when an uninterruptible dual power supply is configured, even if it fails due to lightning surge or various impulse surges, the load is continuously supplied without stopping the load by instantaneously supplying power from the DC power supply circuit. There is an advantage that can be driven. The switching element for the DC power supply circuit switches from the idle operation or the OFF (stop) state to the active state when the voltage of the AC side power supply circuit falls below a predetermined voltage or becomes zero. The idling operation refers to a state in which the switching element repeats ON-OFF in synchronization with the switching element of the AC-side power supply circuit, but no current flows.
[0006]
The DC power supply circuit includes a switching element that operates in synchronization with a switching element of the power supply circuit or according to an operation state of the power supply circuit.
[0007]
A first casing for accommodating the AC drive side unit and a second casing for accommodating the DC power supply circuit unit are provided, and the two casings are attracted in a direction approaching each other, and the first radiating fin and the second radiating fin are combined. The heat conducting means is constituted by connecting means for bringing the casing into contact through openings formed in the casings.
By making the first radiating fins and the second radiating fins in direct contact with the connecting means as described above, the heat conductivity is higher than when heat is conducted through the first and second metal casings. Can be avoided as much as possible, and the heat can be efficiently released by that much. Further, the first casing and the second casing can be integrated by the connecting means.
[0008]
The connecting means is constituted by a single screw or a plurality of screws, so that when connecting by locking or the like, it is possible to surely solve the problem such as poor contact between the first radiating fin and the second radiating fin. Can be.
[0009]
By using the circuit components as diodes and switching elements that generate relatively large amounts of heat, heat can be efficiently dissipated.
[0010]
An exhaust fan for exhausting the internal air to the outside through a hole formed in the first casing is provided in the first casing, and the internal air in the second casing is moved to the first casing side by the exhaust fan. By forming the holes for air guide to make the first casing and the second casing, the internal temperature can be forcibly and efficiently reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a forward type uninterruptible dual power supply device. This uninterruptible dual power supply device includes a power supply circuit A for rectifying an AC from a commercial AC power supply 1 and outputting the rectified AC power to a primary winding N1 of a high-frequency transformer 2, and a secondary winding N2 of the high-frequency transformer 2. And a secondary DC output circuit B for supplying DC power to the load 8 and an operation of the power supply circuit A connected to a tertiary winding N3 of the high frequency transformer 2. A DC power supply circuit C for supplying power to the secondary side DC output circuit B by an output of a secondary battery (hereinafter referred to as a battery) 3 according to the state. The battery 3 may be a nickel-metal hydride battery, a lithium battery, a lead battery, or a nickel-cadmium battery. In addition to the forward type, there are a flyback type, a full-bridge type, a half-bridge type, and the like as the redundant power supply device, and any type of the redundant power supply device may be configured.
[0012]
The power supply circuit A includes a rectifier circuit 4 for rectifying AC from the commercial AC power supply 1, an active filter circuit (which may be omitted) 5 as a harmonic current prevention circuit, A smoothing capacitor 6 for storing a DC voltage, an FET 8 which is operated by a gate signal from a gate circuit 7 and is connected to a primary winding N1 of the high-frequency transformer 2 as a switching element; Although the backflow preventing diode 9 as a means for preventing the backflow of the overcurrent due to the induced voltage to A is a main component, other configurations may be used.
[0013]
The secondary-side DC output circuit B outputs three types of DC output voltages (12 V, 5 V, and 3.3 V from the top in the figure, but any voltage value may be set) to the load 14. The mag-amp 10 and the rectifying diode are respectively connected to three secondary windings N2 (three in this case, but one, two or four or more) having different numbers of turns so that the number of turns can be changed. 11, a smoothing coil 12, a smoothing capacitor 13, and a control circuit 15 for controlling the ON time of the mag-amp 10 to control the voltage to the load 14 to a constant voltage are connected. The provision of the mag-amplifier 10 and the control circuit 15 has the advantage that a constant voltage can be output to the load 14, but can be omitted.
[0014]
The DC power supply circuit C is operated by a battery state monitoring signal circuit 16 for monitoring the state of the battery 3, a charging circuit 17 for charging the battery 3, and a gate signal from a gate circuit 18, and An FET 19 as a switching element connected to the tertiary winding N3 of the high-frequency transformer 2 and a backflow prevention diode 20 as means for preventing backflow of an overcurrent due to an induced voltage from the power supply circuit A to the DC power supply circuit C. However, other configurations may be used. The battery state monitoring signal circuit 16 detects whether the battery 3 is in a charged state or a discharged state, and outputs a control signal for performing charge control or discharge control on the battery 3 based on the output signal, 3 to output a signal for stopping the discharge from the battery 3 by reaching the discharge end voltage upon reaching the discharge end voltage, or to drive or stop the DC power supply circuit C in response to the power failure detection signal or the power failure recovery signal. It is provided for exchanging various signals, such as outputting a control signal for performing the operation.
[0015]
In the redundant power supply device having the above-described configuration, for example, a configuration may be adopted in which a control signal (not shown) is constantly output to the two gate circuits 7 and 18 so that the two switching elements 8 and 19 are synchronized. In addition, when the commercial AC power supply 1 is normal, the switching element 8 of the power supply circuit A is activated, and the switching element 19 of the DC power supply circuit C is synchronized with the switching element 8 to be put into an idle operation or an OFF state. On the other hand, when the voltage from the commercial AC power supply 1 is lower than the predetermined voltage, the switching element 8 of the power supply circuit A is synchronized with the switching element 19 of the DC power supply circuit C to perform the idle operation or the OFF state. And the switching element is made in accordance with the operation state of the power supply circuit A, for example, by making the switching element 19 of the DC power supply circuit C active. It may be allowed to. Here, a redundant power supply device configured to output a DC voltage from the DC power supply circuit C to the secondary DC output circuit B when the output from the power supply circuit A is cut off at the time of a power failure or the like is shown. For example, another power supply circuit capable of outputting a voltage of 24 V may be configured to configure the power supply device.
[0016]
As shown in FIGS. 1, 3, and 4, the power supply circuit A, the primary winding N1, the secondary DC output circuit B, the secondary winding N2, the tertiary winding N3, and the power supply circuit components An AC drive-side unit 22 is composed of the diodes 9 and 11 and a first radiating fin 21 for releasing heat generated from the FET 8. The AC drive-side unit 22 is housed in a first casing 25 and the AC drive-side unit 22 is accommodated in the first casing 25. 1 A part of the radiation fin 21 is exposed to the outside through a hole 25A formed in the first casing 25, and the heat generated from the DC power supply circuit C and the FET 19 and the backflow prevention diode 20, which are components of the DC power supply circuit. A DC power supply circuit unit 24 is constituted by the second heat radiation fins 23 for releasing the heat, the DC power supply circuit unit 24 is accommodated in a second casing 26, and the second heat radiation A part of the pin 23 is exposed to the outside through a hole 26A formed in the second casing 26, and a male and female type which can freely connect and disconnect them to and from the tertiary winding N3 and the DC power supply circuit C. Connecting portions S1 and S2 are provided as connecting means for pulling the casings 25 and 26 in a direction of approaching each other and bringing the two radiation fins 21 and 23 exposed to the outside into a direct contact state. The screw 27 constitutes a heat conducting means 28. The term “exposure” refers to a state that is exposed from the outside, and may be projected from the casing 25 or 26, may be flush with the casing 25 or 26, or may be retracted into the casing 25 or 26. May be present. Specifically, after inserting a screw 27 into a through hole (not shown) formed in the second casing 26 and a through hole 23A formed in the second radiating fin 23, the screw 27 is inserted into the first radiating fin 21. By screwing into the formed screw hole 21A, the two radiation fins 21 and 23 can be maintained in contact with each other, and at the same time, as shown in FIGS. 2 (a), (b) and (c), the casing 25 , 26 can be integrated. At this time, the male connecting portion S2 is fitted into the female connecting portion S1 and the two S1 and S2 are connected. The connection portions S1 and S2 are formed of three terminals, that is, two terminals for connecting the tertiary winding N3 and the DC power supply circuit C to form a closed loop and a ground terminal for obtaining a ground line. Has become. In the figure, one screw 27 is used, but the fins 21 and 23 may be more reliably brought into contact with each other by two or more screws. Instead of the screw 27, the casings 25 and 26 may be provided with a locked portion and a locking portion for locking and holding the casings 25 and 26 in an integrated state, respectively. In this case, there is an advantage that the operation for integrating the casings 25 and 26 can be performed more quickly than using screws. In addition, by bringing the fins 21 and 23 into direct contact with each other, there is an advantage that the heat conductivity can be prevented from lowering. However, the fins 21 and 23 are brought into a heat conduction state with the casings 25 and 26 interposed. It can also be. In this case, it is preferable that the casings 25 and 26 be made of a metal having a high thermal conductivity such as aluminum. Reference numeral 29 shown in FIG. 3 is an electric wire for connecting to the battery 3, and reference numeral 30 is a signal line for inputting and outputting various signals. Reference numeral 31 denotes a wire connected to a commercial AC power supply and a wire for inputting and outputting various signals. Here, the case where the circuits are covered with the casings 25 and 26 has been described, but the casings 25 and 26 may be omitted.
[0017]
As described above, by bringing the radiation fins 21 and 23 into contact with each other, when the commercial AC power supply 1 is in a normal state and only the power supply circuit A is driven to drive the secondary DC output circuit B, Not only the first radiating fins 21 but also the unused second radiating fins 23 can be effectively used to efficiently release the heat generated from the diodes 9, 11 and the FET 8, and the commercial AC power supply 1 is abnormal. When only the DC power supply circuit C is driven to drive the secondary-side DC output circuit B, the diode 20 is not only used by using the second radiating fins 23 but also the first radiating fins 21 which are not used. In addition, heat generated from the FET 19 can be effectively released.
[0018]
As shown in FIG. 3 and FIG. 5A, the first radiating fin 21 is fixed to the first casing 25 side, and the outer surfaces of the diodes 9, 11 and the FET 8 (not shown) are in contact with each other. A main body 21B mounted in a state, an extension 21C having the screw hole 21A and being bent from the main body 21B and exposed to the outside from the first casing 25, and a fin 21D for increasing a heat radiation area. However, the shape of the first radiating fins 21 may be other than the shape shown in the figure. As shown in FIGS. 3 and 5B, the second radiating fin 23 is fixed to the second casing 26 side and is attached to the main body 23B in a state where the outer surfaces of the diode 20 and the FET 19 are in contact with each other. A plurality of auxiliary fins 23C attached to the main body 23B to increase a heat radiation area, and are extended integrally with the main body 23B and exposed from the second casing 26 to the outside as described above. However, the shape of the second radiating fins 23 may be other than the shape shown in the figure. In FIG. 5B, the separately formed main body 23B and the plurality of auxiliary fins 23C are integrated. However, the main body 23B and the auxiliary fins are integrally formed. You can also. K shown in FIGS. 5A and 5B is a substrate for mounting a conductor which is a leg of circuit components such as the diode 20 and the switching element 19.
[0019]
A large number of holes 25K are formed on both end surfaces of the first casing 25 in the connecting direction of the second casing 26, and the internal air that has taken in the outside air through the holes 25K formed on one end surface is externally formed through the holes 25K formed on the other end surface. A discharge fan F for discharging to the other end face is provided in the first casing 25 near the other end face. A large number of holes 26K are formed on both end surfaces of the second casing 26 in the connecting direction of the first casing 25, and holes formed on one end surface in the second casing 26 using the suction force of the discharge fan F. The internal air that has taken in the outside air through 26K is moved to the first casing 25 side through a hole 26K formed in the other end surface, and the internal temperature in the casings 25 and 26 is efficiently reduced by forcibly cooling. So that it can be lowered.
[0020]
By fixing the two casings 25 and 26 and fixing the two radiating fins 21 and 23 with one screw 27, there is an advantage that the number of parts can be reduced and the fixing operation can be speeded up. It may be fixed by separate fixing means.
[0021]
【The invention's effect】
According to the first aspect of the present invention, the power supply circuit and the DC power supply circuit are connected in parallel to the load via the high-frequency transformer, so that a DC-DC converter, a battery, and the like are provided on the secondary side as in the related art. Compared with the power supply device, it is possible to realize not only the simplification of the circuit and the miniaturization (space saving) of the device, but also the high efficiency, and to configure the power supply device having various functions on the assembly work surface. Needless to say, it is possible to provide a power supply device that is advantageous in terms of cost, and can be a power supply device that is useful for both users and manufacturers. Further, when the DC power supply circuit unit is connected to the AC drive side unit, the second heat radiation fins of the DC power supply circuit unit and the first heat radiation fins of the AC drive side unit are brought into a heat conducting state by heat conduction means. As a result, the heat radiation area can be dramatically increased, and a stable power supply device that is not easily affected by heat can be realized while minimizing the size of the device as much as possible.
[0022]
According to the third aspect of the present invention, when the first heat radiation fin and the second heat radiation fin are brought into direct contact with the connecting means, heat is conducted through the first and second metal casings. In comparison, a decrease in the thermal conductivity can be avoided as much as possible, the heat can be efficiently released, and the size of the radiation fin can be reduced accordingly. Further, since the first casing and the second casing can be integrated by the connecting means, it is possible to simultaneously reduce the number of parts and speed up the connecting operation as compared with the case where the connecting means is separately provided. it can.
[0023]
According to the invention of claim 6, an exhaust fan for exhausting the internal air to the outside through the hole formed in the first casing is provided in the first casing, and the internal air in the second casing is removed by the exhaust fan. By forming an air guide hole for moving to the one casing side in the first casing and the second casing, the internal temperature can be forcibly and efficiently reduced, and the size of the device can be reduced by downsizing the fins. Can be further improved.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of an uninterruptible redundant power supply device.
FIGS. 2A and 2B show an external view of an uninterruptible dual power supply unit in which a first casing and a second casing are integrated, (a) is a plan view thereof, (b) is a side view thereof, and (c) is a side view thereof. It is the front view seen from the 2nd casing side.
FIG. 3 is an exploded perspective view showing a state immediately before integrating a second casing with a first casing.
FIG. 4 is a schematic explanatory view showing a configuration inside two integrated casings.
5A and 5B show a shape of a heat radiation fin in a casing, FIG. 5A is a sectional view of the casing showing a shape of a first heat radiation fin, and FIG. 5B is a conventional uninterruptible power supply showing a shape of a second heat radiation fin. FIG. 3 is a cross-sectional view of a casing showing a specific configuration of a redundant power supply device.
FIG. 6 is a schematic block diagram showing a specific configuration of a conventional uninterruptible dual power supply device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Commercial AC power supply 2 High frequency transformer 3 Secondary battery (battery) 4 Rectifier circuit 5 Active filter circuit 6 Smoothing capacitor 7 Gate circuit 8 FET (switching element)
DESCRIPTION OF SYMBOLS 10 Mag amplifier 11 Commutation diode 12 Smoothing coil 13 Smoothing capacitor 14 Load 15 Control circuit 16 Battery state monitoring signal circuit 17 Charging circuit 18 Gate circuit 19 FET (switching element)
Reference Signs List 20 backflow prevention diode 21 first radiating fin 21A screw hole 21B main body 21C extension 21D fin 22 AC drive side unit 23 second radiator fin 23A through hole 23B main body 23C auxiliary fin 23D extension 24 DC power supply circuit Unit 25 First casing 25A, 25K hole 26 Second casing 26A, 26K hole 27 Screw means (connection means)
28 Heat conduction means 29 Electric wire 30 Signal line 50 Converter A power supply circuit B Secondary side DC output circuit C DC power supply circuit N1, N2, N3 Windings S1, S2 Connection

Claims (6)

A rectifier circuit for rectifying AC from a commercial AC power supply and a power supply circuit including a switching element provided on the output side of the rectifier circuit are connected to a primary winding of a high-frequency transformer, and a secondary winding of the high-frequency transformer is connected. A secondary side DC output circuit that supplies power to a load, and a tertiary winding of the high-frequency transformer and a DC power supply circuit separate from the power supply circuit. AC drive from the power supply circuit, the primary winding, the secondary DC output circuit, the secondary winding, the tertiary winding, the first radiating fin for releasing heat generated from the circuit components, and the like. DC power supply circuit comprising a DC side power supply unit and a DC power supply circuit unit comprising the DC power supply circuit and a second radiating fin for releasing heat generated from the circuit component parts, and connected via the connection portion Unity Power supply, characterized in that the provided thermal conducting means for heat conduction with each other and the first heat radiation fins of the second heat radiation fin and the AC driving side unit. The power supply device according to claim 1, wherein the DC power supply circuit includes a switching element that operates in synchronization with a switching element of the power supply circuit or in accordance with an operation state of the power supply circuit. A first casing for accommodating the AC drive side unit and a second casing for accommodating the DC power supply circuit unit are provided. The power supply device according to claim 1 or 2, wherein the heat conducting means is constituted by connecting means for bringing the casing into a contact state through an opening formed in each of the casings. 4. The power supply device according to claim 3, wherein the connection unit includes one or more screws. The power supply device according to claim 1, wherein the circuit components are a diode and the switching element. An exhaust fan for exhausting the internal air to the outside through a hole formed in the first casing is provided in the first casing, and the internal air in the second casing is moved to the first casing side by the exhaust fan. 4. The power supply device according to claim 3, wherein holes for guiding air are formed in the first casing and the second casing.

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