JP2005151672A - Power supply unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple output, large-capacity power supply unit having a main power supply and a sub-power supply, wherein the increase in price can be suppressed and power saving specifications for light load can be satisfied. <P>SOLUTION: Alternating-current power is supplied from a commercial power supply 0 to the main power supply 1 and the sub-power supply 8. The main power supply comprises switches 2, a noise filter 3, a rectifying circuit 4, an oscillation circuit 5, an isolation transformer 6, and a smoothing circuit 7. The sub-power supply is branched and connected at the stage preceding the switches 2, and comprises switches 9, a noise filter 10, a rectifying circuit 11, an oscillation circuit 12, an isolation transformer 13, and a smoothing circuit 14. The main power supply 1 and the sub-power supply 8 respectively generate direct-current power and supply it to a load device 15. The sub-power supply 8 supplies power to the light load of the load device 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power supply apparatus having a main power supply and a sub power supply.

In recent years, in the market of electronic devices, demands for energy saving and high efficiency of devices have increased, and it has become necessary to cope with high efficiency and low loss of power supply units. In particular, the efficiency at the time of a light load such as in the standby mode, which has been conventionally neglected, has been required. For this reason, small-scale energy-saving converters have been announced on the market. This energy-saving converter supplies a DC load (for example, about 1 to 5 V), and even when the load current supplies a minute current (for example, about 10 to several hundred mA), a rated current (for example, about 5 to 10 A). ) Can be maintained at the same efficiency (about 70 to 90%) as in the case of supplying. However, these are not well-known technologies, and few manufacturers have the technology to create them.
In addition, it is difficult to respond to the demand for a multi-output and large-output power supply, and it is possible to install a separate power supply, but this is expensive in price.

Conventionally, an image carrier that forms an electrostatic latent image and visualizes the electrostatic latent image into a toner image, heat generation means for heat-fixing the toner on the transfer paper, and a main power source of the apparatus main body An image forming apparatus having a sub power source usable when the main power source is turned off, wherein the heat generating means is operable by the sub power source. An image forming apparatus having a configuration of a main power source and a sub power source has been proposed (see, for example, Patent Document 1), but this technology relates to a technology for preventing condensation on an image carrier, a developing device, and the like. This is different from the technology corresponding to the DC output under load.
JP 2000-39801 A

  An object of the present invention is to provide a multi-output large-capacity power supply that can suppress an increase in price and satisfy energy-saving specifications at light loads in a power supply device having a main power supply and a sub-power supply.

  The power supply device according to claim 1 is supplied with commercial power and has a first switch, a first noise filter, a first rectifier circuit, a first oscillation circuit including a first switching element, a first insulation transformer. A main power source configured by a first smoothing circuit for generating a first DC power and supplying the first DC power to the first load; and a second DC power provided independently of the main power source for generating a second DC power. And a sub power source for supplying power to two loads.

  According to a second aspect of the present invention, in the power supply device according to the first aspect, the sub power source is branched and connected from the front stage of the first switch in the main power source, and the second switch and the second noise filter are connected. , A second rectifier circuit, a second oscillation circuit including a second switching element, a second insulating transformer, and a second smoothing circuit.

  According to a third aspect of the present invention, in the power supply device according to the first or second aspect, a control signal for stopping the output of the first DC power when the state is changed to a state intended to reduce power consumption. It has a control circuit which outputs to the main power supply.

  According to a fourth aspect of the present invention, in the power supply device according to the third aspect, the first oscillation circuit in the main power supply is stopped by the control signal.

  According to a fifth aspect of the present invention, in the power supply device according to the third aspect, the input of the commercial power source to the main power source is blocked by the control signal.

  According to a sixth aspect of the present invention, in the power supply device according to the fifth aspect, the first switch is cut off in order to cut off the input of the commercial power supply.

  According to a seventh aspect of the present invention, in the power supply device according to the sixth aspect, a relay is used for the first switch.

  According to an eighth aspect of the present invention, in the power supply device according to the sixth aspect, an FET switch is used as the first switch.

  According to a ninth aspect of the present invention, in the power supply device according to any one of the third to eighth aspects, the control circuit is supplied with the second DC power as a power supply voltage.

  According to a tenth aspect of the present invention, in the power supply device according to any one of the first to ninth aspects, the sub power source is configured as an energy saving power source capable of suppressing power consumption and maintaining high efficiency even at light loads. It is characterized by being.

  According to the present invention, it is possible to realize a multi-output large-capacity power supply device that suppresses an increase in price and satisfies energy-saving specifications of equipment used.

  In the present invention, a sub power supply is connected by branching from a preceding stage of a switch for inputting a commercial power supply to a main power supply.

FIG. 1 is a circuit diagram showing a power supply device according to Embodiment 1 of the present invention.
In FIG. 1, AC power is supplied from a commercial power supply 0 (for example, 100 V to 240 V) to a main power supply 1 and a sub power supply 8. The main power supply 1 is configured to include a converter as shown in the figure by a switch 2, a noise filter 3, a rectifier circuit 4, an oscillation circuit 5 including a switching element SW1, an insulating transformer 6, and a smoothing circuit 7. The sub power supply 8 is configured to include a converter as shown by a switch 9, a noise filter 10, a rectifier circuit 11, an oscillation circuit 12 including a switching element SW2, an insulating transformer 13, and a smoothing circuit 14. The main power source 1 and the sub power source 8 each generate DC power and supply it to the load device 15. The sub power supply 8 supplies power to the light load in the load device 15.

Here, even when the load current is a minute current (for example, about 10 to several hundred mA), the sub power supply 8 has the same efficiency (about 70 to 90) as that for supplying a rated current (for example, about 5 to 10 A). %) Is maintained. The main power supply 1 is configured to provide a multi-output large-capacity power supply device that satisfies the energy-saving specifications by designing with individual optimum specifications that match the specifications of the equipment to be used.
The sub power supply 8 is branched and connected from the front stage of the switch 2 of the main power supply 1 as shown.

According to the first embodiment, power is supplied from a commercial power source 0 to a load different from the main power source 1 that generates a DC voltage via the switch 2, the noise filter 3, the rectifier circuit 4, the insulating transformer 6, and the smoothing circuit 7. Since the sub power supply 8 is provided independently of the main power supply 1, it is possible to provide a multi-output large-capacity power supply apparatus that suppresses an increase in price and satisfies the energy saving specifications of the equipment used.
The sub power supply 8 is branched from the previous stage of the switch 2 of the main power supply 1, and supplies a DC voltage to the load via the noise filter 10, the rectifier circuit 11, the insulating transformer 13, and the smoothing circuit 14, so that the price increases. It is possible to provide a multi-output large-capacity power supply that satisfies the energy-saving specifications of the equipment used.

FIG. 2 is a circuit diagram showing a power supply apparatus according to Embodiment 2 of the present invention. The same reference numerals are given to the portions corresponding to those in FIG.
In the second embodiment, the output of the main power supply 1 is output by an output stop signal obtained from the controller 16 provided in the load device 15 that supplies power in order to shift to a state aimed at reducing power consumption such as an energy saving mode. Is to stop. Specifically, the output of the main power supply 1 is stopped by stopping the oscillation circuit 5 of the main power supply 1 by the output stop signal. The controller 16 is supplied with a power supply voltage from the sub power supply 8.
According to the second embodiment, when a transition is made to a state aimed at reducing power consumption such as the energy saving mode, only the sub power supply 8 is operated, so that power consumption can be reduced.

FIG. 3 is a circuit diagram showing a power supply apparatus according to Embodiment 3 of the present invention, and the same reference numerals are given to portions corresponding to those in FIG.
In the third embodiment, in order to make a transition to a state aimed at reducing power consumption such as an energy saving mode, an output stop signal from the controller 16 causes a relay provided at a subsequent stage of the branching portion of the main power source 1 and the sub power source 8. The switch 17 is turned off, and the supply of AC power from the commercial power supply 0 to the main power supply 1 is stopped.

According to the third embodiment, when a transition is made to a state aimed at reducing power consumption such as an energy saving mode, only the sub power supply 8 is operated, so that power consumption can be reduced. In addition, when starting up, the sub power supply 8 is started up first, and the controller 16 starts up by turning on the switch 17 of the main power supply 1 so that the main power supply 1 can be started up only when necessary. Reduction can be achieved.
Further, by using a relay for the switch 17, an increase in price can be suppressed.

FIG. 4 is a circuit diagram showing a power supply apparatus according to Embodiment 4 of the present invention. Portions corresponding to those in FIG.
The fourth embodiment is characterized in that an increase in price is suppressed by using an FET switch 18 instead of the switch 17 of FIG.

  The fifth embodiment is characterized in that the sub power source 8 of each of the first to fourth embodiments uses an energy saving power source that can suppress power consumption and maintain high efficiency even at light loads. Examples of energy-saving power sources that can maintain high efficiency at light loads include those using IPD elements as switching elements, those that thin out the switching frequency at light loads, and those that intermittently oscillate.

  According to the fifth embodiment, since an energy saving power source that suppresses power consumption and maintains high efficiency even at light loads is used, a large output and large capacity that suppresses price increase and satisfies the energy saving specifications of the equipment used. A power supply device can be provided.

It is a circuit diagram which shows the power supply device by Example 1 of this invention. It is a circuit diagram which shows the power supply device by Example 2 of this invention. It is a circuit diagram which shows the power supply device by Example 3 of this invention. It is a circuit diagram which shows the power supply device by Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main power supply 2 Switch 3 Noise filter 4 Rectification circuit 5 Oscillation circuit SW1 Switching element 6 Insulation transformer 7 Smoothing circuit 8 Sub power supply 9 Switch 10 Noise filter 11 Rectification circuit 12 Oscillation circuit SW2 Switching element 13 Insulation transformer 14 Smoothing circuit 15 Load device 16 controller

Claims (10)

Commercial power is supplied, and includes a first switch, a first noise filter, a first rectifier circuit, a first oscillation circuit including a first switching element, a first isolation transformer, and a first smoothing circuit. A main power source that generates first DC power and supplies the first DC power to the first load;
A power supply apparatus comprising: a sub power supply provided independently of the main power supply and generating a second DC power and supplying the second DC power to the second load.   The sub power supply is branched and connected from the front stage of the first switch in the main power supply, and includes a second switch, a second noise filter, a second rectifier circuit, and a second switching element. The power supply device according to claim 1, comprising an oscillation circuit, a second insulating transformer, and a second smoothing circuit.   2. A control circuit for outputting a control signal for stopping the output of the first DC power to the main power supply when transitioning to a state intended to reduce power consumption. 2. The power supply device according to 2.   4. The power supply device according to claim 3, wherein the first oscillation circuit in the main power supply is stopped by the control signal.   4. The power supply apparatus according to claim 3, wherein an input of the commercial power supply to the main power supply is interrupted by the control signal.   6. The power supply device according to claim 5, wherein the first switch is cut off in order to cut off the input of the commercial power supply.   The power supply apparatus according to claim 6, wherein a relay is used for the first switch.   The power supply device according to claim 6, wherein an FET switch is used as the first switch.   The power supply apparatus according to claim 3, wherein the control circuit is supplied with the second DC power as a power supply voltage.   The power supply apparatus according to any one of claims 1 to 9, wherein the sub power supply is configured as an energy saving power supply capable of suppressing power consumption and maintaining high efficiency even at a light load.

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