JP2009065807A - Switching power source apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching power source apparatus in which a plurality of switching power supply units for supplying power of different voltages are included and all of them stop power supply at the same time when at least one of the switching power supply units supplies a voltage and/or a current beyond a predetermined range. <P>SOLUTION: In the switching power source apparatus, failure detecting units 11, 17, 23 set on the supply side of switching power source units 3, 4, 5 respectively, evaluate a voltage and/or a current beyond a predetermined range as failure, and in the latter parts of the failure detecting units 11, 17, 23, a failure judging unit 6 is connected to judge an abnormal power supply, and when the judging unit 6 receives an abnormal detecting signal from at least one of the failure detecting units 11, 17, 23, a control signal for stopping the switching function is sent to the control units 9, 15, 21 of switching power source devices 3, 4, 5 at the same time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a switching power supply device that outputs electricity of a desired voltage or current by turning on and off a semiconductor switch.
In particular, the present invention supplies electricity with a plurality of different preset voltages, and when at least one of the electricity voltage and / or current exceeds a value in a preset range, The present invention relates to an improvement to prevent troubles in parts / devices to which electricity is supplied.

  The following documents are known for a switching power supply device that supplies a desired voltage by turning on / off a semiconductor switch and a means for protecting against an overvoltage electricity supplied.

JP-A-8-163866 JP-A-8-256474

By combining the switching power supply device disclosed in Patent Document 1 with the technology of the overvoltage protection means disclosed in Patent Document 2 as a configuration in which the switching power supply device is configured to function against overvoltage electricity. The switching power supply device 1a shown in FIG.
The switching power supply device 1a includes switching power supply units 3a, 4a, and 5a that supply electricity of a plurality of different voltages. When an abnormality is detected in at least one of these switching power supply units, The switching power supply unit is configured to stop functioning.

That is, the switching power supply device 1a shown in FIG. 2 includes three switching power supply units 3a, 4a, and 5a that output electricity having a voltage different from the input power.
The switching power supply unit 3a includes a switching unit 7a, a transformer 8a, a control unit 9a, a smoothing unit 10a, an abnormality detection unit 11a, and an output end 12a.

  Similarly, the switching power supply unit 4a includes a switching unit 13a, a transformer 14a, a control unit 15a, a smoothing unit 16a, an abnormality detection unit 17a and an output end 18a, and the switching power supply unit 5a includes a switching unit 19a. A transformer 20a, a control unit 21a, a smoothing unit 22a, an abnormality detection unit 23a, and an output end 24a are provided.

Here, in the switching power supply unit 3a, the transformer 8a is connected to the power input terminal 2a and the switching unit 7a on the input side, and is connected to the smoothing unit 10a on the output side.
Similarly, in the switching power supply unit 4a, the transformer 14a is connected to the power input terminal 2a and the switching unit 13a on the input side, and to the smoothing unit 16a on the output side. In the switching power supply unit 5a, the transformer 20a is connected to the power on the input side. The output end is connected to the smoothing portion 22a on the input end 2a and the switching portion 19a.

Each of the switching units 7a, 13a, and 19a includes a transistor and an amplifier (both not shown).
The transistor is connected to the input side of each corresponding transformer, and stores energy in each corresponding transformer by a switching action in cooperation with the amplifier.

When receiving a signal indicating a detection result (voltage / current error detection) from each corresponding abnormality detection unit, the amplifier amplifies the signal to a predetermined level and sends it to each corresponding control unit.
If the abnormality detection unit 11a detects an abnormality in the electricity from the transformer 8a, the abnormality detection unit 11a detects the abnormality in the control unit 21a. If the abnormality detection unit 17a detects an abnormality in the electricity from the transformer 14a, the abnormality detection unit 11a detects the abnormality. When detecting an abnormality in the electricity from the transformer 20a, the unit 23a sends a message to that effect to the control unit 21a.

When the control unit 21a receives a signal indicating that an abnormality has been detected from the abnormality detection unit 11a, the control unit 21a sends a control signal to the switching unit 19a to stop the function, and the function of the switching unit 19a stops the output of the transformer 20a. The abnormality detection unit 23a detects that the output from the transformer 20a is stopped as an abnormality, and sends a signal indicating abnormality detection to the control unit 9a and the control unit 15a.
Here, the control unit 9a and the control unit 15a both stop the functions of the switching unit 7a and the switching unit 13a based on the signal indicating the abnormality detection, and as a result, the supply of electricity from the transformer 8a and the transformer 14a is not performed. Stop.

When the abnormality detection unit 17a detects an abnormality in the electricity from the transformer 14a and when the abnormality detection unit 23a detects an abnormality in the electricity from the transformer 20a, the control units 9a, 15a, and 21a are the same as described above. As a result, when an abnormality is detected in the electricity supplied by any one of the three switching power supply units 3a, 4a and 5a, the supply of electricity from all the switching power supply units is stopped. It is configured to function.
Further, in such a configuration, it is possible to configure a device having a desired number of switching power supply units. Even in a switching power supply device having a desired number of switching power supply units, at least one of the switching power supply units can be provided. When an abnormality is detected in the electricity supplied by one, it functions so that the supply of electricity from all the switching power supply units is stopped.

  The switching power supply device 1a has a plurality of switching power supply units with different voltages of electricity to be supplied, and when an abnormality is detected in the electricity supplied by at least one of the plurality of switching power supply units, The supply of electricity from the switching power supply unit is stopped. As a result, for example, even if an abnormal voltage exceeding a preset range occurs, the supply of electricity to the entire device stops, so that abnormal electricity is supplied to the parts, devices, devices, etc. to which electricity is supplied. It is possible to avoid problems such as troubles.

However, in the switching power supply device 1a having the above-described configuration, the switching function is stopped in one specific switching power supply unit by detecting an abnormality in the electricity to be supplied in one of the plurality of switching power supply units, and this specification The function of all the remaining switching power supply units is stopped based on the stoppage of the function of one switching power supply unit. Here, the function of all the switching power supply units is stopped and all the power supply of the switching power supply unit 1a is supplied. Is configured to stop.
However, there are parts, devices, devices, etc. that receive electricity from the switching power supply device 1a when there is an abnormality in the electricity supplied, for example, when the electricity supplied is at a high voltage. There is something that needs to stop supplying electricity immediately.

In particular, in the case where what is supplied with abnormal electricity from the switching power supply device 1a is, for example, a certain type of semiconductor device, the function of the semiconductor device is not stopped at all by the supplied abnormal electricity. The problem becomes even more serious when the streets fail to function and the cause of the trouble is difficult to find.
The present invention has been made in view of the above circumstances, and includes a plurality of switching power supply units that supply different voltages and electricity, and abnormal electricity is supplied to at least one of the plurality of switching power supply units. Then, the present invention provides a switching power supply device that can immediately stop the supply of electricity from all of the plurality of switching power supply units based on this abnormal supply of electricity.

In the present invention, when at least one of a plurality of switching power supply units that supply electricity with different voltages supplies abnormal electricity, the abnormality is detected and transmitted to the abnormality determining unit, and the abnormality determining unit A switching power supply device configured to simultaneously send a control signal for stopping output to a switching power supply unit.
The detailed configuration includes a primary side power input unit and a primary side power input unit connected to the primary side power input unit to receive power supply, and supply and supply electricity of different preset voltages by switching action. In a switching power supply apparatus having a plurality of switching power supply units each provided with an abnormality detection unit that detects when the electrical voltage or / and current is abnormal beyond a preset range,
When at least one of the abnormality detection units of the plurality of switching power supply units detects that the voltage or / current of the electricity to be supplied is abnormal beyond a preset range, the detection result is received, A switching power supply unit configured to simultaneously send a control signal for stopping the supply of electricity to all of the plurality of switching power supply units.

Note that the configuration in which the control signal is simultaneously sent to all the control units in response to the input of one abnormality detection signal is specifically, the abnormality determination unit 6 has a function of an OR gate of the logic circuit, and an abnormality is detected on the input side. A functional configuration of an abnormality determination unit that outputs a control signal for function control to all the control units when a detection signal is input and this abnormality detection signal is input can be mentioned.
In addition, the control of the control unit to the switching unit should be such that when the abnormality detection exceeds the preset voltage or / and current range, there is no abnormality in the electricity supplied by avoiding this state. In addition to stopping the electricity from the transformer, controlling the voltage of the supplied electricity can also be mentioned.

  When it is detected that at least one of the electricity from a plurality of switching power supply units exceeds a preset voltage or current range, the power supply to all the switching power supply units is stopped simultaneously. By being configured to send a control signal, the supply of electricity to a specific switching power supply unit among the plurality of switching power supply units is stopped, and from the other remaining switching power supply units based on the stoppage of the supply of electricity Compared with the case where the supply of electricity is stopped, the supply of electricity from all the switch power supply units can be stopped in a short time. Therefore, the parts, devices, devices, etc. that receive the supply of electricity are abnormal. It is a switching power supply device that can further avoid damages and problems caused by being supplied with electricity.

The present invention will be described in detail based on the best mode for carrying out the invention shown in FIG. However, this does not limit the present invention.
The switching power supply device 1 includes a power input unit 2, switching power supply units 3, 4, and 5, and an abnormality determination unit 6.

Each of the switching power supply units 3, 4, and 5 is supplied with power from the power input unit 2 and outputs electricity having a preset current and a different voltage.
The power input unit 2 is a terminal that inputs AC power to input electricity supplied by rectifying and smoothing an alternating current.

The switching power supply unit 3 includes a switching unit 7, a transformer 8, a control unit 9, a smoothing unit 10, an abnormality detection unit 11, and an output end 12.
The transformer 8 is connected to the power input unit 2 and the switching unit 7 on the input side, and the smoothing unit 10 is connected to the output side.

The switching unit 7 includes a transistor (not shown) that is connected to the input side of the transformer 8 and accumulates energy in the transformer 8 by a switching action.
The control unit 9 performs control for the electric voltage output from the smoothing unit 10 to be a preset value and control for stopping the electric output (supply of electricity) from the smoothing unit 10. .

The smoothing unit 10 includes a diode and a capacitor (both not shown), and rectifies, smoothes, and outputs the electricity from the transformer 8.
The abnormality detection unit 11 is used for a circuit, a device, a device, or the like to be supplied with electricity from the output terminal 12 when the DC electric voltage from the smoothing unit 10 is outside the preset value range. When it is determined that the voltage is abnormal enough to cause damage due to the voltage of the electricity being too high, the supply target is regarded as abnormal and the abnormality detection signal is sent to the abnormality determination unit 6. In particular, it functions to stop the output of direct current electricity from the smoothing unit 10.

Here, as described above, the abnormality determination unit 6 is interposed between the abnormality detection unit 11 that detects electrical abnormality and the control unit 9 that controls the switching function, and performs abnormality determination. This is to perform a function related to control, and will be described in detail later.
The switching power supply unit 4 has the same contents as the switching power supply unit 3 in terms of configuration and function.

That is, the switching power supply unit 4 includes a switching unit 13, a transformer 14, a control unit 15, a smoothing unit 16, an abnormality detection unit 17, and an output end 18.
The transformer 14 is connected to the power input unit 2 and the switching unit 13 on the input side, and the smoothing unit 16 is connected to the output side.

The switching unit 13 includes a transistor (not shown) that is connected to the input side of the transformer 14 and stores energy in the transformer 14 by a switching action.
The control unit 15 performs control for the electric voltage output from the smoothing unit 16 to be a preset value and control for stopping the electric output (supply of electricity) from the smoothing unit 16. .

The smoothing unit 16 includes a diode and a capacitor (both not shown), and rectifies, smoothes and outputs electricity from the transformer 14.
The abnormality detection unit 17 outputs an abnormality detection signal to the abnormality determination unit 6 when the DC electrical voltage from the smoothing unit 16 is outside the preset voltage range, that is, when the abnormality is detected in the voltage. As a result, the output of DC electricity from the output side of the transformer 14 is stopped.

The switching power supply unit 5 has the same contents as the switching power supply unit 3 in terms of configuration and function.
That is, the switching power supply unit 5 includes a switching unit 19, a transformer 20, a control unit 21, a smoothing unit 22, an abnormality detection unit 23, and an output end 24.

The transformer 20 is connected to the power input unit 2 and the switching unit 19 on the input side, and the smoothing unit 22 is connected to the output side.
The switching unit 19 includes a transistor (not shown) that is connected to the input side of the transformer 20 and accumulates energy in the transformer 20 by a switching action.

The control unit 21 performs control for the electric voltage output from the smoothing unit 22 to be a preset value and control for stopping the electric output (electric supply) from the smoothing unit 22. .
The smoothing unit 22 includes a diode and a capacitor (both not shown), and rectifies, smoothes, and outputs electricity from the transformer 20.

  The abnormality detection unit 23 outputs an abnormality detection signal to the abnormality determination unit 6 when the DC electrical voltage from the smoothing unit 22 is outside the preset voltage range, that is, when the abnormality is detected in the voltage. As a result, the output of DC electricity from the output side of the transformer 20 is stopped.

  The abnormality determination unit 6 has an OR gate function of a logic circuit and is connected to a subsequent stage of the abnormality detection unit 11, 17, 23 and is abnormal beyond the voltage range preset in the abnormality detection unit 11, 17, 23. When an abnormality detection signal is received from at least one of the abnormality detection units 11, 17, and 23, the switching power supply unit is supplied to the control unit 9. 3 is stopped, and as a result, a control signal for stopping the supply of electricity from the output side of the transformer 8 is sent to the control unit 15. 14, the control signal for stopping the supply of electricity from the output side and the control unit 21, the switching function of the switching power supply unit 5 is stopped, and as a result, the transformer 2 Of an electrical control signal for stopping the supply of the output side, and is configured to output simultaneously.

Below, the function of the principal part of the switching power supply device 1 will be described.
The user connects the target parts, devices, and the like to which electricity from the switching power supply units 3, 4, 5 is supplied to the output terminals 12, 18, 24, respectively.
Then, it connects with the power supply side (illustration omitted) so that predetermined | prescribed electricity may be supplied to the electric power input part 2, and the switching power supply device 1 is functioned.

Here, in the switching power supply unit 3, the switching unit 7 functions, and as a result, electricity from the output side of the transformer 8 is sent to the smoothing unit 10 to perform rectification and smoothing. It is sent to the output terminal 12 via the abnormality detection unit 11.
Therefore, as described above, components, devices, and the like that are connected to the output terminal 12 so as to receive electricity supplied at a preset voltage receive electricity supplied via the abnormality detection unit 11.

Similarly, in the switching power supply unit 4, the switching unit 13 functions, and as a result, electricity of a preset voltage sent from the output side of the transformer 14 and coming via the smoothing unit 16 and the abnormality detection unit 17 is received. Parts, devices, and the like that are sent to the output end 18 and connected to the output end 18 are supplied with electricity of a preset voltage from the switching power supply unit 4.
In the switching power supply unit 5, the switching unit 19 functions. As a result, electricity of a preset voltage sent from the output side of the transformer 20 and coming through the smoothing unit 22 and the abnormality detecting unit 23 is output. The components, devices, etc. sent to the output terminal 24 and connected to the output terminal 24 are supplied with electricity of a preset voltage from the switching power supply unit 5.

In this way, when the switching power supply 1 supplies electricity having different preset voltages from the switching power supply units 3, 4, and 5, the switching power supply unit 3 causes the smoothing unit 10 to Assume that the voltage is sufficiently higher than a preset value.
Here, electricity having a voltage sufficiently higher than the preset value means a voltage that is high enough to cause damage or malfunction to a component, device, device, or the like connected to the output terminal 12.

Here, electricity is sent from the output side of the transformer 8, rectification and smoothing are performed by the smoothing unit 10, and when the electricity is sent to the abnormality detecting unit 11, the abnormality detecting unit 11 is sent from the smoothing unit 10. Since the voltage of electricity is sufficiently higher than a preset range, it is detected as abnormal, and an abnormality detection signal is sent to the abnormality determination unit 6.
When the abnormality determination unit 6 receives this abnormality detection signal, it determines that an abnormality has occurred in the electricity supplied by the switching power supply unit 3, and stops the switching function corresponding to the control units 9, 15, and 21 simultaneously. A control signal is sent out.

Here, in the switching power supply unit 3, when the control unit 9 receives the control signal from the abnormality determination unit 6, the function of the switching unit 7 is stopped, and the supply of electricity from the output side of the transformer 8 to the smoothing unit 10 is stopped. Let
Accordingly, since electricity is not supplied to the smoothing unit 10, as a result, the supply of electricity from the output end 12 to the components, devices, devices, etc. connected thereto is stopped, and electricity is supplied to these components, devices, devices, etc. Therefore, a situation in which damage is caused by the supply of electricity at a voltage sufficiently higher than a preset value does not occur.

Similarly, in the switching power supply unit 4, when the control unit 15 receives a control signal from the abnormality determination unit 6, the control unit 15 stops the function of the switching unit 13 and stops supplying electricity from the output side of the transformer 14 to the smoothing unit 16. As a result, electricity is not supplied from the output end 18 to the components, devices, devices, and the like connected thereto.
Therefore, parts, devices, devices, and the like connected to the output terminal 18 do not receive electricity, so that a situation in which damage is caused by receiving electricity supplied with a voltage sufficiently higher than a preset value does not occur.

Further, also in the switching power supply unit 5, when the control unit 21 receives the control signal from the abnormality determination unit 6, the control unit 21 stops the function of the switching unit 19, and the supply of electricity from the output side of the transformer 20 to the smoothing unit 22 is stopped. As a result, electricity is not supplied from the output terminal 24 to the components, devices, devices, and the like connected thereto.
Accordingly, similarly, since the parts, devices, devices, etc. connected to the output terminal 24 are not supplied with electricity, there is a situation in which damage is caused by receiving electricity supplied with a voltage sufficiently higher than a preset value. Does not occur.

As described above, since the switching power supply 1, the control signals from the abnormality determination unit 6 to the control units 9, 15, and 21 are sent simultaneously, the switching power supply units 3, 4, and 5 substantially simultaneously supply electricity. Will stop.
Here, when the switching power supply device 1 is compared with the switching power supply device 1a shown in FIG. 2 which can be considered based on Patent Document 1 and Patent Document 2 cited in the background art, three switching power supply units 3, 4 and 5 are provided. When an abnormality detection signal is sent from at least one of (3a, 4a, 5a), the switching power supply units 3, 4, 5 (3a, 4a, 5a) are stopped from supplying electricity. Therefore, it is coincident that the control signal for transmitting is transmitted.

However, in the switching power supply device 1, when the abnormality determination unit 6 receives the abnormality detection signal, the control unit 9, 15, 21 sends a control signal for simultaneously stopping the supply of electricity to the switching power supply units 3, 4, 5. Therefore, the controllers 9, 15, and 21 receive the stop signal substantially simultaneously and perform the stop function.
Therefore, as a result, the supply of electricity from the smoothing unit 10 of the switching power supply unit 3 to the outside, the supply of electricity from the smoothing unit 16 of the switching power supply unit 4 to the outside, and the smoothing unit 22 of the switching power supply unit 5 The supply of electricity to the outside is stopped substantially at the same time, such as circuits, devices, devices, etc. connected to the output terminal 12 of the switching power supply unit 3, circuits, devices connected to the output terminal 18 of the switching power supply unit 4 Circuits, devices, devices, etc. connected to the output end 24 of the device etc. and the switching power supply unit 5 stop receiving electricity substantially simultaneously.

Here, “substantially simultaneously” in the above expression is strictly different from the abnormality determination unit 6 to the length of the connection line from the control unit 9, 15, 21, the corresponding time of the control unit 9, 15, 21, etc. However, considering the time required for signal transmission, it means that the time required is the same because it may be considered as simultaneous.
On the other hand, in the switching power supply device 1a, after the abnormality detection signal is received by the control unit 21a, after further steps, all the switching power supply units 3a, 4a, 5a are configured to stop supplying electricity, Circuits, devices, devices, and the like connected to the switching power supply units 3a, 4a, and 5a stop supplying power after taking a further step after the control unit 21a receives the abnormality detection signal.

Therefore, circuits, devices, devices, etc. that receive power from the switching power supply device 1 are
As compared with the switching power supply device 1a, the reception of electricity is stopped at a time earlier than the time required for the above-mentioned further steps, so that the voltage considered as an abnormality exceeding the preset range accordingly. Therefore, troubles such as damage caused by the supply of electricity can be kept low.
Although the switching power supply device 1 is configured to include three switching power supply units 3, 4, and 5, the number of switching power supply units may be two or four or more as desired.

In the switching power supply device 1, the voltage of electricity supplied from the three switching power supply units 3, 4, 5 is not clearly shown, but the circuit, device, It may be set to a value desired by the device or the like.
In the function of the main part of the switching power supply device 1, the abnormality detection units 11, 17, and 23 of the three switching power supply units 3, 4, and 5 detect an abnormality depending on whether or not the electric voltage exceeds a preset range. However, the detection target may be an electric current, or a voltage and a current.

  In the function of the main part of the switching power supply device 1, the abnormality determining unit 6 controls the voltage of electricity supplied by any one of the three switching power supply units 3, 4, 5 exceeding a preset range. It functions to send a signal for stopping the function to the units 9, 15, and 21 at the same time. However, since the abnormality determination unit 6 functions as an OR gate of a logic circuit as described above, three switching power supply units When an abnormality detection signal is received from any two of three, four, or five, or from all three switching power supply units 3, 4, and 5, the control units 9, 15, and 21 are simultaneously stopped. Functions to send a signal.

In the function of the main part of the switching power supply device 1, when one of the switching power supply units 3, 4, 5 detects an abnormality in electricity, the abnormality determination unit 6 simultaneously stops functioning in the control units 9, 15, 21. However, it may be configured to control the electricity from the desired switching power supply unit to a voltage within a range that does not cause problems for the circuit, device, device, etc. to be supplied. .
Such a configuration makes it possible to avoid problems caused by suddenly stopping the supply of electricity.

It is a block diagram explaining the structure of the best form which concerns on this invention. FIG. 2 is a view corresponding to FIG.

Explanation of symbols

1: Switch power supply unit 3, 4, 5: Switch power supply unit 6: Abnormality determination unit 7, 13, 19: Switching unit 8, 14, 20: Transformer 9, 15, 21: Control unit 10, 16, 22: Smoothing unit 11, 17, 23: Transmitter

Claims (2)

A primary power input unit, and a primary power input unit connected to the primary power input unit to receive power supply, supply electricity of a preset voltage different by switching action, and / or supply electrical voltage or / and In a switching power supply device having a plurality of switching power supply units each provided with an abnormality detection unit for detecting when the current is abnormal beyond a preset range,
When at least one of the abnormality detection units of the plurality of switching power supply units detects that the voltage or / current of the electricity to be supplied is abnormal beyond a preset range, the detection result is received, A switching power supply device configured to simultaneously send a control signal for stopping the supply of electricity to all of the plurality of switching power supply units.
All of the plurality of switching power supply units are provided with a control unit that controls means for functioning switching, and when receiving an abnormality detection signal from at least one abnormality detection unit of the plurality of switching power supply units, 2. The switching power supply unit according to claim 1, wherein a signal for stopping the switching function is simultaneously sent to the control unit of the switching power supply unit.

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