JP6966121B1 - Signal judgment device, power supply device, signal judgment method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal determination device capable of avoiding an abnormal state in an operation mode in which a load is light in a power supply device. A signal determination device is a pulse signal for switching between an on state and an off state of a switching element included in a power conversion circuit, and is a detection means for detecting the pulse signal having an intermittent period and the detection. A determination means for determining whether or not the pulse signal is abnormal based on the pulse signal detected by the means is provided. [Selection diagram] FIG. 10

Description

The present invention relates to a signal determination device, a power supply device, a signal determination method and a program.

A power conversion circuit such as a converter circuit may change the power to be supplied depending on the load.
Patent Document 1 discloses a technique for switching a pulse signal supplied to a switching element as a related technique.

Japanese Unexamined Patent Publication No. 2016-063621

By the way, in a power supply device that supplies electric power to a load, if the pulse signal applied to the switching element becomes abnormal in an operation mode in which the load is light, the switching element may be damaged. Therefore, in the power supply device, there is a demand for a technique capable of avoiding an abnormal state in an operation mode with a light load.

Each aspect of the present invention aims to provide a signal determination device, a power supply device, a signal determination method, and a program capable of solving the above problems.

In order to achieve the above object, according to one aspect of the present invention, the signal determination device is a pulse signal for switching between the on state and the off state of the switching element included in the power conversion circuit, and has an intermittent period. It is provided with a detecting means for detecting the pulse signal and a determining means for determining whether or not the pulse signal is abnormal based on the pulse signal detected by the detecting means.

In order to achieve the above object, according to another aspect of the present invention, the power supply device includes the signal determination device and the power conversion circuit.

In order to achieve the above object, according to another aspect of the present invention, the signal determination method is a pulse signal for switching between an on state and an off state of a switching element included in a power conversion circuit, and has an intermittent period. It includes detecting the existing pulse signal and determining whether or not the pulse signal is abnormal based on the detected pulse signal.

In order to achieve the above object, according to another aspect of the present invention, the program is a pulse signal for causing a computer to switch between an on state and an off state of a switching element included in a power conversion circuit, and is an intermittent period. To detect the pulse signal in which
Based on the detected pulse signal, it is determined whether or not the pulse signal is abnormal, and the execution is performed.

According to each aspect of the present invention, in the power supply device, it is possible to avoid an abnormal state in the operation mode in which the load is light.

It is a figure which shows an example of the structure of the power supply device by one Embodiment of this invention. It is the first figure for demonstrating the pulse signal in one Embodiment of this invention. It is a 2nd figure for demonstrating the pulse signal in one Embodiment of this invention. It is a figure which shows an example of the processing flow of the power supply apparatus by one Embodiment of this invention. It is the first figure for demonstrating the effect of the power supply apparatus by one Embodiment of this invention. It is a 2nd figure for demonstrating the effect of the power supply device by one Embodiment of this invention. It is a 3rd figure for demonstrating the effect of the power supply apparatus by one Embodiment of this invention. It is a 4th figure for demonstrating the effect of the power supply device by one Embodiment of this invention. It is a 5th figure for demonstrating the effect of the power supply device by one Embodiment of this invention. It is a figure which shows the minimum structure of the signal determination apparatus by embodiment of this invention. It is a figure which shows an example of the processing flow of the signal determination apparatus of the minimum configuration by embodiment of this invention. It is a schematic block diagram which shows the structure of the computer which concerns on at least one Embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.
<Embodiment>
The power supply device 1 according to an embodiment of the present invention is a device for improving efficiency when a load is low in an information processing system or the like. As shown in FIG. 1, the power supply device 1 includes a power supply 10, a first capacitor 20, a converter circuit 31 (an example of a power conversion circuit), a transformer 40, a rectifier circuit 50, an inductor 60, a second capacitor 70, and a current detection circuit. 80, a control circuit 90, a signal determination device 100, a third capacitor 110, a fourth capacitor 120, and a pulse transformer 130 are provided.

The power supply 10 outputs DC power. The first capacitor 20 reduces the ripple of the voltage output by the power supply 10.

The converter circuit 31 is a circuit that outputs a desired voltage. For example, the converter circuit 31 is a DC-DC converter that generates a desired voltage from a DC voltage. The converter circuit 31 includes switching elements 30a, 30b, 30c, and 30d. Hereinafter, the switching elements 30a, 30b, 30c, and 30d are collectively referred to as the switching element 30. The switching element is, for example, a MOSFET (METal-Oxide-Semiconductor Field Effect Transistor, hereinafter referred to as a MOS transistor) or the like. The converter circuit 31 generates a desired voltage from the DC voltage output by the power supply 10 by switching each of the switching elements 30a, 30b, 30c, and 30d between the on state and the off state based on the control signal.

The transformer 40 receives the voltage generated by the converter circuit 31 at the primary side (input side) coil. The transformer 40 converts the voltage received by the primary coil into a voltage having a different amplitude, and outputs the converted voltage from the secondary coil to the rectifier circuit 50.

The rectifier circuit 50 generates a DC voltage by rectifying the voltage output by the transformer 40. The inductor 60 and the second capacitor 70 form a filter. This filter removes the voltage of the high frequency component superimposed on the DC voltage generated by the rectifier circuit 50. The voltage from which the voltage of the high frequency component is removed is supplied to the load 2.

The current detection circuit 80 is connected to the signal determination device 100 via the signal line L1. The current detection circuit 80 detects the value of the current flowing through the load 2 when the voltage is supplied to the load 2. The current detection circuit 80 outputs the value of the detected current to the signal determination device 100 via the signal line L1.

The control circuit 90 is connected to the signal determination device 100 via the signal line L2. The control circuit 90 includes a signal generation unit 90a. The signal generation unit 90a generates a pulse signal that is a source of a control signal for controlling the switching element 30 based on an instruction signal output from the signal determination device 100 described later. In a normal state where the load 2 is equal to or greater than a predetermined load, the continuous operation mode is set, and the pulse signal generated by the signal generation unit 90a is a continuous pulse signal as shown in FIG. Further, when the load 2 is less than a predetermined load and the load is low, the intermittent operation mode is set, and the pulse signal generated by the signal generation unit 90a is a pulse signal having an intermittent period in which the pulse signal is not output, as shown in FIG. Is. The signal generation unit 90a has terminals A, B, C, and D. The signal generation unit 90a outputs the generated pulse signal from the terminals A and B and the terminals C and D to the pulse transformer 130 via the signal determination device 100, the third capacitor 110, and the fourth capacitor 120, respectively. In either of the continuous operation mode and the intermittent operation mode, the number of pulse signals output from terminals A and B and the number of pulse signals output from terminals C and D are output when the operation is normal. The number of pulse signals is the same.

Each of the third capacitor 110 and the fourth capacitor 120 removes the DC signal component of the pulse signal (that is, the bias component of the signal), and transfers only the AC component of the pulse signal (that is, the change in the signal) to the pulse transformer 130. It works to output.

The signal determination device 100 is connected to the load 2 via the signal line L3. The signal determination device 100 includes a signal detection circuit 100a (an example of detection means) and a signal control circuit 100b. The signal detection circuit 100a monitors the pulse signal output by the control circuit 90, and detects at least one parameter such as the voltage level state of the pulse signal, the number of output pulse signals, and the period of the pulse signal. The signal determination device 100 outputs the detected parameter as pulse signal information to the signal control circuit 100b via the signal line L4.

The signal control circuit 100b includes a control unit 100b1 (an example of a determination means and an example of an output means) and a storage unit 100b2. The control unit 100b1 receives pulse signal information from the signal detection circuit 100a from the signal detection circuit 100a via the signal line L4. The control unit 100b1 compares parameters such as the voltage level of a normal pulse signal, the number of pulse signals, and the period of the pulse signal stored in advance by the storage unit 100b2 with a plurality of parameters indicated by the information of the received pulse signal. .. The control unit 100b1 determines whether or not the pulse signal output to the pulse transformer 130 is abnormal based on the comparison result. For example, the control unit 100b1 determines that the pulse signal is abnormal when it is determined that one or more of the plurality of compared parameters exceeds the tolerance range of the error set in advance for each parameter. Further, the control unit 100b1 determines that the pulse signal is normal when it is determined that all of the plurality of compared parameters are within the allowable range of the error set in advance for each parameter.

Further, the control unit 100b1 receives a current value from the current detection circuit 80 via the signal line L1. The control unit 100b1 compares the load current value stored in advance by the storage unit 100b2 with the value of the received current. The control unit 100b1 determines whether or not the load 2 is a low load based on the comparison result. When the control unit 100b1 determines that the load 2 is a low load, the control unit 100b1 outputs an instruction signal for switching from the continuous operation mode to the intermittent operation mode to the control circuit 90 via the signal line L2.

Further, when the control unit 100b1 determines that the pulse signal output to the pulse transformer 130 is abnormal in the intermittent operation mode, the control unit 100b1 forcibly changes from the intermittent operation mode to the continuous operation mode via the signal line L2. The instruction signal to be switched is output to the control circuit 90. Thereby, the abnormality of the pulse signal in the intermittent operation mode can be avoided, and the abnormal state (eccentric state) of the pulse transformer 130 can be reset by returning the pulse signal to the pulse transformer 130 to normal.

The pulse transformer 130 receives the pulse signal generated by the signal generation unit 90a by two primary side (input side) coils. The pulse transformer 130 converts the pulse signal received by each primary coil into a pulse signal having an amplitude for driving the switching element 30, and converts the converted voltage into two secondary coils corresponding to each primary coil. That is, a total of four secondary coils output to the corresponding four switching elements 30.

Next, a process in which the power supply device 1 determines an abnormality of the pulse signal in the intermittent operation mode will be described. Here, the processing flow of the power supply device 1 shown in FIG. 4 will be described. It is assumed that the control unit 100b1 determines that the load 2 is a low load and outputs an instruction signal for switching from the continuous operation mode to the intermittent operation mode to the control circuit 90 via the signal line L2.

In the intermittent operation mode, the signal generation unit 90a transmits the generated pulse signal from the terminals A and B and the terminals C and D to the pulse transformer 130 via the signal determination device 100, the third capacitor 110, and the fourth capacitor 120, respectively. Output.

The signal detection circuit 100a monitors the pulse signal output by the control circuit 90, and detects at least one parameter such as the voltage level state of the pulse signal, the number of output pulse signals, and the period of the pulse signal (step). S1). The signal determination device 100 outputs the detected parameter as pulse signal information to the signal control circuit 100b via the signal line L4.

The control unit 100b1 receives pulse signal information from the signal detection circuit 100a from the signal detection circuit 100a via the signal line L4. The control unit 100b1 compares parameters such as the voltage level of a normal pulse signal, the number of pulse signals, and the period of the pulse signal stored in advance by the storage unit 100b2 with a plurality of parameters indicated by the information of the received pulse signal. (Step S2). The control unit 100b1 determines whether or not the pulse signal output to the pulse transformer 130 is abnormal based on the comparison result (step S3).

When the control unit 100b1 determines that the pulse signal is normal (NO in step S3), the control unit 100b1 returns to the process of step S1. Further, when the control unit 100b1 determines that the pulse signal is abnormal (YES in step S3), the control circuit 90 transmits an instruction signal for forcibly switching from the intermittent operation mode to the continuous operation mode via the signal line L2. Is output to (step S4).

The signal generation unit 90a receives an instruction signal for forcibly switching from the signal determination device 100 to the continuous operation mode. The signal generation unit 90a outputs a continuous pulse signal to the pulse transformer 130 in response to the instruction signal. The pulse transformer 130 receives a continuous pulse signal from the control circuit 90. The pulse transformer 130 converts the amplitude of the received continuous pulse signal and outputs it to the switching element 30.

The power supply device 1 according to the embodiment of the present invention has been described above. The signal determination device 100 included in the power supply device 1 includes a signal detection circuit 100a (an example of a detection means) and a control unit 100b1 (an example of a determination means). The signal detection circuit 100a is a pulse signal for switching between an on state and an off state of the switching element 30 included in the converter circuit 31 (an example of a power conversion circuit), and detects the pulse signal having an intermittent period. The control unit 100b1 determines whether or not the pulse signal is abnormal based on the pulse signal detected by the signal detection circuit 100a.

By doing so, when an abnormality of the pulse signal is detected in the intermittent operation mode with a light load, it is possible to quickly switch to the continuous operation mode with a heavy load, and it is possible to avoid an abnormal state in the power supply device.

In one embodiment of the present invention, the case where the power supply 10 outputs DC power and the converter circuit 31 is a DC-DC converter has been described. However, in another embodiment of the present invention, the power supply 10 may output AC power and the converter circuit 31 may be an AC-DC converter.

The abnormal state of the pulse signal is, for example, the number of pulse signals output from terminals A and B of the control circuit 90 and the number of pulse signals output from terminals C and D as shown in FIG. Is in a different state. When the pulse signal is normal, the current in the pulse transformer 130 becomes stable, for example, as shown in FIG. As a result, as shown in FIG. 7, the magnetic flux of the pulse transformer 130 becomes a stable state, and the pulse signal applied to the switching element 30 also becomes a stable signal. On the other hand, when the pulse signal is abnormal, the magnetic flux is biased in the pulse transformer 130 as shown in FIG. 8, and the magnetic flux is saturated. As a result, when the pulse signal is abnormal, as shown in FIG. 9, the pulse signal applied to the switching element 30 also becomes an unstable signal, and the switching element 30 may be damaged.

FIG. 10 is a diagram showing the minimum configuration of the signal determination device 100 according to the embodiment of the present invention. The signal determination device 100 includes a detection unit 200 and a determination unit 300.

The detection means 200 is a pulse signal for switching between an on state and an off state of the switching element included in the power conversion circuit, and detects the pulse signal having an intermittent period. The determination means 300 determines whether or not the pulse signal is abnormal based on the pulse signal detected by the detection means 200.

Next, processing by the signal determination device 100 having the minimum configuration according to the embodiment of the present invention will be described. Here, the processing flow shown in FIG. 11 will be described.

The detection means 200 is a pulse signal for switching between an on state and an off state of the switching element included in the power conversion circuit, and detects the pulse signal having an intermittent period (step S11). The determination means 300 determines whether or not the pulse signal is abnormal based on the pulse signal detected by the detection means 200 (step S12).

The signal determination device 100 having the minimum configuration according to the embodiment of the present invention has been described above. With this signal determination device 100, it is possible to avoid an abnormal state in the operation mode in which the load is light in the power supply device.

In another embodiment of the present invention, the method of resetting the abnormal state (eccentric state) of the pulse transformer 130 may be another method. For example, as another method of resetting the abnormal state (eccentric state) of the pulse transformer 130, the current detection circuit 80 monitors the current consumption of the load 2, and the control unit 100b1 shifts from the intermittent operation mode to the continuous operation mode. Calculate the change in the current consumption value up to. Then, the control unit 100b1 forcibly switches to the continuous operation mode by outputting an instruction signal for increasing the load corresponding to the change in the current consumption in the load 2 to the load 2 via the signal line L3. The method can be mentioned.

In another embodiment of the present invention, the pulse signal is generated based on the information of the pulse signal detected by the signal detection circuit 100a and the pulse signal detected by the signal detection circuit 100a determined by the control unit 100b1. The determination result of whether or not it is abnormal may be recorded in the storage unit 100b2. By doing so, it is possible to confirm the log at the time of periodic inspection and to notify the occurrence of an abnormality at the time of periodical status confirmation from the host control device. As a result, it is possible to avoid a sudden failure during operation of the device and perform maintenance and replacement work for normally terminating the device after saving data.

In another embodiment of the present invention, the pulse signal generated by the control circuit 90 may directly drive the switching element 30 without using the pulse transformer 130 or the like.

In the processing according to the embodiment of the present invention, the order of the processing may be changed as long as the appropriate processing is performed.

Although the embodiment of the present invention has been described, the above-mentioned control circuit 90, signal determination device 100, and other control devices may have a computer system inside. The process of the above-mentioned processing is stored in a computer-readable recording medium in the form of a program, and the above-mentioned processing is performed by the computer reading and executing this program. A specific example of a computer is shown below.
FIG. 12 is a schematic block diagram showing the configuration of a computer according to at least one embodiment.
As shown in FIG. 12, the computer 5 includes a CPU 6, a main memory 7, a storage 8, and an interface 9.
For example, each of the above-mentioned control circuit 90, signal determination device 100, and other control devices is mounted on the computer 5. The operation of each processing unit described above is stored in the storage 8 in the form of a program. The CPU 6 reads the program from the storage 8, expands it into the main memory 7, and executes the above processing according to the program. Further, the CPU 6 secures a storage area corresponding to each of the above-mentioned storage units in the main memory 7 according to the program.

Examples of the storage 8 include HDD (Hard Disk Drive), SSD (Solid State Drive), magnetic disk, optical magnetic disk, CD-ROM (Compact Disk Read Only Memory), DVD-ROM (Digital Versaille Memory Memory), and DVD-ROM (Digital Versaille Memory Memory). , Semiconductor memory and the like. The storage 8 may be internal media directly connected to the bus of computer 5, or external media connected to computer 5 via an interface 9 or a communication line. When this program is distributed to the computer 5 via a communication line, the distributed computer 5 may expand the program in the main memory 7 and execute the above processing. In at least one embodiment, the storage 8 is a non-temporary tangible storage medium.

Further, the above program may realize a part of the above-mentioned functions. Further, the program may be a file that can realize the above-mentioned functions in combination with a program already recorded in the computer system, that is, a so-called difference file (difference program).

Although some embodiments of the present invention have been described, these embodiments are examples and do not limit the scope of the invention. Various additions, omissions, replacements, and changes may be made to these embodiments without departing from the gist of the invention.

1 ... Power supply device 2 ... Load 5 ... Computer 6 ... CPU
7 ... Main memory 8 ... Storage 9 ... Interface 10 ... Power supply 20 ... First capacitors 30, 30a, 30b, 30c, 30d ... Switching element 31 ... Converter circuit 40 ... Transformer 50 ... Rectifier circuit 60 ... Inlay 70 ... Second capacitor 80 ... Current detection circuit 90 ... Control circuit 90a ... Signal generator 100 ... Signal determination device 100a.・ ・ Signal detection circuit 100b ・ ・ ・ Signal control circuit 100b1 ・ ・ ・ Control unit 100b2 ・ ・ ・ Storage unit 110 ・ ・ ・ Third capacitor 120 ・ ・ ・ Fourth capacitor 130 ・ ・ ・ Pulse transformer

Claims (7)

A pulse signal for switching between an on state and an off state of a switching element included in a power conversion circuit, and a detection means for detecting the pulse signal having an intermittent period.
Based on the pulse signal detected by the detection means, a determination means for determining whether or not the pulse signal is abnormal, and
A signal determination device comprising. An output means that outputs a command signal that changes the pulse signal to a pulse signal that does not have an intermittent period when the determination means determines that the pulse signal is abnormal.
The signal determination device according to claim 1. The determination means
Whether or not the pulse signal is abnormal is determined based on the voltage level of the pulse signal, the number of pulse signals of the pulse signal, and at least one of the period of the pulse signal.
The signal determination device according to claim 1 or 2. The determination means
It is determined whether or not the pulse signal is abnormal based on the value of the current flowing through the load of the power conversion circuit.
The signal determination device according to any one of claims 1 to 3. The signal determination device according to any one of claims 1 to 4.
With the power conversion circuit
Power supply device equipped with. It is a pulse signal for switching between the on state and the off state of the switching element included in the power conversion circuit, and it is possible to detect the pulse signal having an intermittent period and to detect the pulse signal.
Judging whether or not the pulse signal is abnormal based on the detected pulse signal,
Signal determination method including. On the computer
It is a pulse signal for switching between the on state and the off state of the switching element included in the power conversion circuit, and it is possible to detect the pulse signal having an intermittent period and to detect the pulse signal.
Judging whether or not the pulse signal is abnormal based on the detected pulse signal,
A program that executes.

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