Power supply device, power supply circuit control device, and program

Abstract

To solve such a problem that it is difficult to quickly interrupt the excess current while suppressing false detection caused by noise.SOLUTION: A power supply device 10 comprises a power supply circuit 20 and a control device 40 of the power supply circuit 20. The power supply circuit 20 includes: a battery 21 capable of supplying power to a load 50 through respective power supply lines; a switch and a power conversion circuit 24 positioned on a high-potential power supply line LA; and a voltage detection unit 25 which detects output voltage V to the load 50. The control device 40 includes: a differentiation processing unit 43 which outputs a differential value corresponding to the output voltage; an integration processing unit 44 which outputs an integrated value resulting from the definite integration of the differential value at a unit time interval; and a switch control processing unit 45 which can control the on-state and the off-state of the switch. The differentiation processing unit 43 outputs the value obtained by differentiating the difference between the output voltage and the integrated value as the differential value. The switch control processing unit 45 switches the switch to the off-state when the differential value reaches a threshold.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply device, a power supply circuit control device, and a program. [Background technology]

[0002] The power supply device described in Patent Document 1 includes a detection circuit that detects an overcurrent in the output current. The detection circuit includes an overcurrent detection means, a voltage differential calculation means, a differential value detection means, and a third logic circuit. The overcurrent detection means detects whether the output current of the power supply device is an overcurrent. The voltage differential calculation means calculates a differential value of the output voltage of the power supply device. The differential value detection means detects whether the differential value is equal to or greater than a set value. The third logic circuit detects an overcurrent and outputs a load abnormality signal when the differential value is equal to or greater than the set value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-207655 Summary of the Invention [Problem to be solved by the invention]

[0004] In a power supply device such as that described in Patent Document 1, the voltage differential calculation means calculates the differential value of the output voltage, including noise. Therefore, when large noise is superimposed on the output voltage, the differential value detection means calculates a differential value that includes the noise fluctuation. As a result, the third logic circuit outputs an erroneous load abnormality signal due to the noise. On the other hand, when an abnormality such as a load short circuit occurs, it is necessary to quickly shut off the overcurrent, so it is necessary to both suppress erroneous detection due to noise and quickly shut off the overcurrent. [Means for solving the problem]

[0005] In order to solve the above problem, the present invention provides a power supply device comprising: a battery capable of supplying power to a load via a power line; a switch located on the power line and switchable between an on state and an off state; a power conversion circuit located on the power line; a voltage detection unit that detects an output voltage to the load; a differential processing unit that outputs a differential value corresponding to the output voltage; an integral processing unit that outputs an integral value that is the result of integrating the differential value output by the differential processing unit over a unit time interval; and a switch control processing unit that can switch the switch to an off state, wherein the differential processing unit outputs a value obtained by differentiating the difference between the output voltage and the integral value as the differential value, and the switch control processing unit switches the switch to an off state when the differential value reaches a threshold value.

[0006] The present invention is also applicable to a power supply circuit including a battery capable of supplying power to a load via a power line, a switch located on the power line and switchable between an on state and an off state, a power conversion circuit located on the power line, and a voltage detection unit that detects an output voltage to the load, and includes: a differential processing unit that outputs a differential value corresponding to the output voltage; an integral processing unit that outputs an integral value that is the result of integrating the differential value output by the differential processing unit over a unit time interval; and a switch control processing unit that can switch the switch to an off state, wherein the differential processing unit outputs a value obtained by differentiating the difference between the output voltage and the integral value as the differential value, and the switch control processing unit switches the switch to an off state when the differential value reaches a threshold value.

[0007] Furthermore, the present invention is a program applicable to a power supply device including a battery capable of supplying power to a load via a power line, a switch located on the power line and switchable between an on state and an off state, a power conversion circuit located on the power line, a voltage detection unit that detects an output voltage to the load, and a control device that can switch the switch, and causes the control device to execute a differentiation process that outputs a differentiation value corresponding to the output voltage, an integration process that outputs an integration value that is the result of integrating the differentiation value output in the differentiation process over a unit time interval, and a switch control process that switches the switch to an off state when the differentiation value reaches a threshold, wherein the differentiation process is a process that differentiates the difference between the output voltage and the integration value and outputs the differentiation value as the differentiation value.

[0008] According to the above configuration, the differential processing unit outputs a differential value obtained by differentiating the difference obtained by subtracting the integral value output by the integral processing unit from the output voltage. Through the differential and integral processing, the integral value output from the integral processing unit reflects past noise components to a certain extent, compared to the output voltage that should be output, i.e., the output voltage without noise superimposition. Then, by feeding back this integral value to the input of the differential processing unit, noise in the output voltage can be suppressed, while continuous changes in the output voltage remain. Therefore, when detecting an abnormality in the output voltage to the load, false detections caused by noise can be suppressed. Furthermore, because an abnormality can be detected in a single detection, overcurrent can be quickly shut off. Therefore, each element of the power supply circuit can be easily protected. [Effects of the Invention]

[0009] It can quickly cut off overcurrent while suppressing false detection due to noise. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of the configuration of a power supply device. [Figure 2] FIG. 2 is a flow diagram of voltage abnormality detection control. [Figure 3]FIG. 3 is a time chart when the power supply circuit of the comparative example is operated. [Figure 4] FIG. 4 is a time chart when the power supply circuit of the embodiment is operated. DETAILED DESCRIPTION OF THE INVENTION

[0011] <One embodiment of a power supply device, a power supply circuit control device, and a program> An embodiment of a power supply device, a power supply circuit control device, and a program will be described below with reference to the drawings. The following detailed description is for illustrative purposes only and is not intended to limit the embodiments of the present disclosure or the application and use of such embodiments.

[0012] (About the power supply circuit) 1, the power supply device 10 includes a power supply circuit 20. The power supply circuit 20 includes a battery 21, a high-potential power supply line LA, a low-potential power supply line LB, a high-potential output terminal 22A, and a low-potential output terminal 22B.

[0013] The battery 21 can supply DC power to the load 50 via each power supply line and each output terminal. The battery 21 is, for example, a lithium ion battery. The battery 21 has a positive terminal 21A and a negative terminal 21B. A first end of the high-potential power supply line LA is connected to the positive terminal 21A of the battery 21. A second end of the high-potential power supply line LA is connected to the high-potential output terminal 22A. The high-potential output terminal 22A is connectable to the load 50. A first end of the low-potential power supply line LB is connected to the negative terminal 21B of the battery 21. A second end of the low-potential power supply line LB is connected to the low-potential output terminal 22B. The low-potential output terminal 22B is connectable to the load 50. The potential of the low-potential output terminal 22B is set to ground potential. The load 50 operates using DC voltage from the power supply device 10. The load 50 is, for example, a server or storage in a data center.

[0014] The power supply circuit 20 includes a fuse 23. The fuse 23 is located on the high-potential power supply line LA. That is, a first end of the fuse 23 is connected to the positive terminal 21A of the battery 21. A second end of the fuse 23 is connected to the high-potential output terminal 22A. The fuse 23 melts and cuts off the flow of current when a current greater than a certain value flows.

[0015] The power supply circuit 20 includes a power conversion circuit 24. The power conversion circuit 24 is located on a high-potential power supply line LA and a low-potential power supply line LB. That is, a high-potential input terminal of the power conversion circuit 24 is connected to a positive terminal 21A of the battery 21 via a fuse 23. A high-potential output terminal of the power conversion circuit 24 is connected to a high-potential output terminal 22A. A low-potential input terminal of the power conversion circuit 24 is connected to a negative terminal 21B of the battery 21. A low-potential output terminal of the power conversion circuit 24 is connected to a low-potential output terminal 22B. The operation of the power conversion circuit 24 is controlled by a control circuit (not shown).

[0016] The power conversion circuit 24 is, for example, a step-up DC-DC converter. That is, the power conversion circuit 24 steps up the voltage input from the battery 21 to a predetermined voltage for the load 50 and outputs the voltage.

[0017] The power supply circuit 20 includes a first switch 30 and a second switch 31. The first switch 30 and the second switch 31 are both located on the high potential power supply line LA, and can be switched between an on state and an off state.

[0018] The first switch 30 is located between the power conversion circuit 24 on the high-potential power supply line LA and the high-potential output terminal 22A for the load 50. Although not shown, the first switch 30 is configured with one or more switching elements. An example of the switching element is an N-type MOSFET (metal oxide semiconductor field effect transistor).

[0019] The second switch 31 is located on the high-potential power supply line LA between the battery 21 and the power conversion circuit 24. Although not shown, the second switch 31 is configured with one or more switching elements. An example of the switching element is an N-type MOSFET.

[0020] The power supply circuit 20 includes a voltage detection unit 25. The voltage detection unit 25 detects the potential difference between the high potential output terminal 22A and the low potential output terminal 22B of the power supply circuit 20 as an output voltage V to the load 50.

[0021] (Power supply circuit control device and program) As shown in Fig. 1, the power supply device 10 has a control device 40 (hereinafter simply referred to as "control device 40") for the power supply circuit 20. The control device 40 acquires the output voltage V detected by the voltage detection unit 25. The control device 40 also outputs a first control signal S1 for switching the first switch 30 between an on state and an off state. Similarly, the control device 40 outputs a second control signal S2 for switching the second switch 31 between an on state and an off state.

[0022] The control device 40 has a storage device 41 and an arithmetic processing device 42. That is, the control device 40 is an MCU (Microcontroller Unit). The storage device 41 stores various programs executed by the arithmetic processing device 42. One of the programs is a voltage abnormality detection program PG for detecting an abnormality in the output voltage V. Furthermore, by executing the voltage abnormality detection program PG, the arithmetic processing device 42 functions as a differential processing unit 43, an integral processing unit 44, and a switch control processing unit 45. That is, the arithmetic processing device 42 has the differential processing unit 43, the integral processing unit 44, and the switch control processing unit 45 as functional blocks. The arithmetic processing device 42 includes, for example, a CPU (Central Processing Unit) or an MPU (Micro Processing Unit).

[0023] (Regarding voltage abnormality detection control) Next, we will explain the voltage abnormality detection control performed by the control device 40. Note that each process of this voltage abnormality detection control is performed by the arithmetic processing device 42 executing the voltage abnormality detection program PG stored in the storage device 41. Furthermore, the voltage abnormality detection control is executed when the power supply device 10 starts operating.

[0024] As shown in FIG. 2, when the arithmetic processing device 42 starts the voltage abnormality detection control, the arithmetic processing device 42 performs differentiation processing in step S11. Specifically, in step S11, the arithmetic processing device 42 acquires the output voltage V detected by the voltage detection unit 25 from a unit time ago to the present. The arithmetic processing device 42 also acquires an integral value output by the integration processing unit 44 (described later) for the unit time before the present. Next, the arithmetic processing device 42, functioning as the differentiation processing unit 43, calculates the difference between the value of the output voltage V acquired by the voltage detection unit 25 and the integrated value. The arithmetic processing device 42 then differentiates the difference and outputs the differentiated value. Note that the arithmetic processing device 42 may also output a value obtained by multiplying the differentiated value of the difference by a predetermined coefficient. When the first differentiation processing is performed after the start of the voltage abnormality detection control, the integration processing (described later) has not yet been performed. In this case, for example, the differentiation processing unit 43 calculates the differentiated value by setting the integrated value to 0.

[0025] Next, the arithmetic processing device 42 of the control device 40 performs integration processing in step S12. Specifically, the arithmetic processing device 42, functioning as the integral processing unit 44, performs definite integration of the differential value output by the differential processing unit 43 over a unit time interval. The arithmetic processing device 42 then outputs the resulting integral value. The unit time is, for example, 100 milliseconds. As described above, the integral value output in step S12 is used in the differential processing in step S11 of the next cycle.

[0026] Next, the arithmetic processing device 42 of the control device 40 performs the process of step S13. Specifically, first, the arithmetic processing device 42 serving as the switch control processing device 45 compares the differential value output by the differential processing device 43 with a predetermined threshold value. Then, the arithmetic processing device 42 determines whether the differential value has reached the threshold value. In this embodiment, as an example, the arithmetic processing device 42 determines whether the absolute value of the differential value has reached the threshold value. Note that, when the differential value is a positive value, the fact that the absolute value of the differential value has reached the threshold value means that the differential value is equal to or greater than the positive threshold value. On the other hand, when the differential value is a negative value, the fact that the absolute value of the differential value has reached the threshold value means that the differential value is equal to or less than the negative threshold value. In the process of step S13, if it is determined that the absolute value of the differential value has not reached the threshold value (S13: NO), the arithmetic processing device 42 performs the process of step S11 again.

[0027] On the other hand, when it is determined in the process of step S13 that the differential value has reached the threshold value (S13: YES), the arithmetic processing device 42 of the control device 40 performs the switch control process of step S14. In the process of step S14, the arithmetic processing device 42 serving as the switch control processing unit 45 outputs a second control signal S2 for switching the second switch 31 to the OFF state. Thereafter, after a predetermined time has elapsed, the arithmetic processing device 42 of the control device 40 performs the process of step S15. Note that the predetermined time is determined in advance as the time from when the arithmetic processing device 42 outputs the second control signal S2 to when the second switch 31 has completely switched to the OFF state.

[0028] In the switch control process of the following step S15, the arithmetic processing device 42 serving as the switch control processing unit 45 outputs a second control signal S2 for switching the first switch 30 to the OFF state. Thereafter, the arithmetic processing device 42 ends the series of voltage abnormality detection control.

[0029] Whether the voltage abnormality detection program PG is functioning or not can be confirmed by the following method. First, the degree of noise that can be suppressed is determined by feeding back the integral value of the integral processing unit 44 to the differential processing unit 43. The degree of noise is expressed, for example, by a predetermined S / N ratio. Note that the "degree of noise that can be suppressed" varies depending on the unit time interval at which the arithmetic processing unit 42 acting as the integral processing unit 44 performs definite integration, etc. Next, the following tests (a) and (b) are performed. (a) A voltage obtained by adding noise below the "level of noise that can be suppressed" to the output voltage V is input to the integration processing unit 44. In this state, the load 50 is short-circuited, and the output voltage V becomes approximately zero. (b) A voltage obtained by adding noise greater than the "level of noise that can be suppressed" to the output voltage V is input to the integration processing unit 44. In this state, the load 50 is short-circuited, and the output voltage V becomes approximately zero.

[0030] In the above test (a), if each switch switches to the off state immediately after the output voltage V is set to approximately zero, and in the test (b), if each switch switches to the off state before the output voltage V is set to approximately zero, it can be confirmed that the program of the control device 40 is functioning normally.

[0031] In the above test (a), if each switch does not switch to the off state immediately after the output voltage V is set to approximately zero, or in the test (b), if each switch switches to the off state immediately after the output voltage V is set to approximately zero, it can be said that the voltage abnormality detection program PG is not functioning.

[0032] (Comparison with conventional technology) Below, a comparison of the operation of the power supply device 10 of the embodiment and the power supply device of the comparative example will be described. First, the power supply device of the comparative example will be described. The configuration of the power supply device of the comparative example is the same as the configuration of the power supply device 10 of the embodiment. However, the power supply device of the comparative example executes control different from the voltage abnormality detection control executed by the power supply device 10 of the embodiment.

[0033] In the power supply device of the comparative example, the arithmetic processing unit of the control device is capable of executing short-circuit detection control. When executing short-circuit detection control, the arithmetic processing unit compares the output voltage with a predetermined value at every predetermined control period. In this short-circuit detection control, the arithmetic processing unit determines that a short circuit has occurred on the load side when the output voltage falls below the predetermined value twice consecutively. If it determines that a short circuit has occurred on the load side, the arithmetic processing unit switches the battery switch to the OFF state. Thus, in the power supply device of the comparative example, the arithmetic processing unit determines that a short circuit has occurred when the output voltage falls below the predetermined value continuously for a period equal to or longer than the control period in order to detect a short circuit on the load side while preventing erroneous detection due to noise. However, as shown in FIG. 3 , in the power supply device of the comparative example, even after the output voltage is first detected to fall below the predetermined value, the output current continues to increase in response to the short circuit. Then, the output voltage is detected a second time to fall below the predetermined value, and the battery switch is turned off, and the output current finally decreases. That is, while the power supply circuit of the comparative example can suppress erroneous detection caused by noise, it takes a certain amount of time to determine whether a short circuit has occurred, and therefore cannot quickly cut off overcurrent.

[0034] On the other hand, as described above, in the power supply device 10 of the embodiment, the integral processing unit 44 feeds back to the differential processing unit 43 a value that reflects past noise components to some extent. This allows the power supply device 10 of the embodiment to suppress noise in the output voltage V while allowing continuous fluctuations in the output voltage V to remain. In other words, since the input value to the differential processing unit 43 is a value from which noise components have already been removed to some extent, erroneous determinations due to noise are unlikely to occur if the determination is based on the output of the differential processing unit 43. Therefore, the power supply device 10 of the embodiment does not need to set a condition for multiple consecutive times, such as when the output voltage falls below a predetermined value two consecutive times, as in the power supply device of the comparative example. As a result, as shown in FIG. 4 , an abnormality in the output voltage V to the load 50 can be determined when the differential value first reaches the threshold, i.e., at the first detection. Therefore, the power supply circuit 20 of the embodiment can quickly shut off an overcurrent while suppressing erroneous detections due to noise.

[0035] (Effects of this embodiment) (1) According to the above embodiment, the differential processing unit 43 outputs a differential value obtained by differentiating the difference obtained by subtracting the integral value output by the integral processing unit 44 from the output voltage V. Through the differential and integral processing, the integral value output by the integral processing unit 44 reflects past noise components to a certain extent, compared to the output voltage that should be output, i.e., the output voltage without noise superimposition. By feeding back this integral value to the input of the differential processing unit 43, noise in the output voltage V can be suppressed, while continuous changes in the output voltage V remain. Therefore, when detecting an abnormality in the output voltage V to the load 50, false detections due to noise can be suppressed. Furthermore, because an abnormality can be detected in a single detection, overcurrent can be quickly shut off. This facilitates protection of each element of the power supply circuit 20.

[0036] (2) In the above embodiment, the first switch 30 is located on the high-potential power line LA between the high-potential output terminal of the power conversion circuit 24 and the high-potential output terminal 22A. With this configuration, for example, when a differential value reaches a threshold due to a short circuit in the load 50, the flow of current from the power conversion circuit 24 to the load 50 can be interrupted. This prevents the power remaining in the power conversion circuit 24 from being discharged to the load 50. This makes it easier to protect each element of the power supply circuit 20.

[0037] (3) In the above embodiment, the second switch 31 is located on the high-potential power line LA between the battery 21 and the power conversion circuit 24. When the differential value reaches the threshold, the switch control processor 45 first switches the second switch 31 to the OFF state, and then switches the first switch 30 to the OFF state. This makes it difficult for power to remain in the power conversion circuit 24 when, for example, the differential value reaches the threshold due to a short circuit in the load 50. Therefore, when the first switch 30 is switched to the OFF state, the discharge of power from the battery 21 to the first switch 30 is reduced. This allows the first switch 30 to be protected.

[0038] <Example of change> The above-described embodiment and the following modified examples can be implemented in combination with each other to the extent that no technical contradiction occurs.

[0039] (Example of power supply circuit changes) The power supply circuit 20 may include multiple batteries 21. In this case, the multiple batteries 21 can be treated as a single DC power supply, and the control device 40 and the voltage abnormality detection program PG can be applied. Also, the control device 40 and the voltage abnormality detection program PG can be applied to each of the multiple batteries 21.

[0040] The load 50 is not limited to a server or the like as exemplified in the above embodiment. For example, the load 50 may be an inverter. In this way, the power supply device 10 can also supply power to a device that operates on AC power via an inverter.

[0041] The power supply circuit 20 does not need to include the fuse 23. In addition, the power supply circuit 20 may include multiple fuses 23. The power supply circuit 20 may include other elements. For example, the power supply circuit 20 may include a capacitor and an inductor for suppressing fluctuations in the voltage from the battery 21, a resistor for adjusting the voltage, and the like.

[0042] The power conversion circuit 24 is not limited to the example in the above embodiment, and may be, for example, a bidirectional converter. The power supply circuit 20 may have only the first switch 30, or may have only the second switch 31. If the control device 40 can distinguish between noise and an abnormality on the load 50 side and cut off the flow of current on the high-potential power supply line LA when an abnormality on the load 50 side is detected, it is possible to obtain the effect of making it easier to protect each element of the power supply circuit 20.

[0043] The configuration of each switch is not limited to the example in the above embodiment. It is sufficient that the on state and the off state can be switched by a control signal from the control device 40. For example, each switch may include multiple switching elements connected in series or in parallel. Furthermore, the switching elements are not limited to N-type MOSFETs, and may be P-type MOSFETs or other transistors.

[0044] (Examples of changes to the control device and program of the power supply circuit) The power supply device 10 may include a plurality of control devices 40. For example, a control device 40 may be provided for each switch.

[0045] The control device 40 does not have to be implemented by an MCU. For example, the integral processing unit 44 and the differential processing unit 43 may be analog circuits. When the integral processing unit 44 is configured as an analog circuit, an example of the integral processing unit 44 is a capacitor connected between the high-potential power supply line LA and the ground potential.

[0046] In the integration process, the unit time interval is not limited to the example in the above embodiment and can be changed as appropriate according to the frequency of the noise to be suppressed. In the switch control process, the condition for switching each switch to the OFF state does not necessarily have to be the absolute value of the differential value; it is sufficient that the absolute value of the differential value exceeds a threshold value as a positive value. For example, when the differential value is a negative value, the condition may be that the differential value falls below a predetermined negative threshold value. In this case, the absolute value of the differential value exceeds the absolute value of the threshold value. Therefore, it can be said that the absolute value of the differential value exceeds the threshold value.

[0047] In the switch control process, the threshold value may be a fixed value set in advance, or may be a variable value calculated each time one of the steps in the voltage abnormality detection control is performed. In the switch control process, at least one of step S14 and step S15 may be performed. That is, only the first switch 30 may be switched off, or only the second switch 31 may be switched off.

[0048] In the switch control process, the order of steps S14 and S15 does not matter. That is, the first switch 30 may be turned off before the second switch 31 is turned off. The same applies when the power supply circuit 20 has three or more switches. That is, the order in which the multiple switches are turned off does not matter.

[0049] However, if the power supply circuit 20 has multiple switches, it is preferable to turn off the switch on the high-potential power supply line LA starting from the side closest to the battery 21. This allows the flow of current on the high-potential power supply line LA to be cut off while discharging the power remaining between the battery 21 and the high-potential output terminal 22A. This makes it easier to protect each element of the power supply circuit 20.

[0050] <Additional Notes> The technical concepts that can be derived from the above-described embodiments and modifications will be described below. [1] a battery capable of supplying power to a load via a power supply line; a switch located on the power supply line and switchable between an on state and an off state; a power conversion circuit located on the power supply line; a voltage detection unit that detects an output voltage to the load; a differential processing unit that outputs a differential value according to the output voltage; an integration processing unit that outputs an integral value obtained by integrating the differential value output by the differentiation processing unit over a unit time interval; a switch control processing unit capable of switching the switch to an off state; Equipped with the differential processing unit differentiates a difference between the output voltage and the integral value and outputs the differentiated value; The switch control processing unit switches the switch to an off state when the differential value reaches a threshold value.

[0051] [2] The power supply device according to [1], wherein the switch is located on the power supply line between the power conversion circuit and an output terminal for the load.

[0052] [3] When the switch is a first switch, a second switch located on the power supply line between the battery and the power conversion circuit; The power supply device according to [2], wherein the switch control processing unit switches the second switch to an off state and then switches the first switch to an off state when the differential value reaches the threshold value.

[0053] [4] The power supply device according to any one of [1] to [3], wherein the switch control processing unit switches the switch to an off state when the differential value becomes equal to or greater than the threshold value.

[0054] [5] The power supply device according to any one of [1] to [4], wherein the switch control processing unit switches the switch to an off state when the differential value becomes equal to or less than the threshold value.

[0055] [6] a battery capable of supplying power to a load via a power supply line; a switch located on the power supply line and switchable between an on state and an off state; a power conversion circuit located on the power supply line; a voltage detection unit that detects an output voltage to the load; The present invention is applied to a power supply circuit comprising: a differential processing unit that outputs a differential value according to the output voltage; an integration processing unit that outputs an integral value obtained by integrating the differential value output by the differentiation processing unit over a unit time interval; a switch control processing unit capable of switching the switch to an off state; Equipped with the differential processing unit differentiates a difference between the output voltage and the integral value and outputs the differentiated value; The switch control processing unit is a control device for a power supply circuit that switches the switch to an off state when the differential value reaches a threshold value.

[0056] [7] The power supply circuit control device according to [6], wherein the switch control processing unit switches the switch to an off state when the differential value becomes equal to or greater than the threshold value.

[0057] [8] The power supply circuit control device according to [6] or [7], wherein the switch control processing unit switches the switch to an off state when the differential value becomes equal to or less than the threshold value.

[0058] [9] a battery capable of supplying power to a load via a power supply line; a switch located on the power supply line and switchable between an on state and an off state; a power conversion circuit located on the power supply line; a voltage detection unit that detects an output voltage to the load; a control device capable of switching the switch; The present invention relates to a power supply device comprising: The control device a differentiation process for outputting a differential value according to the output voltage; an integration process for outputting an integral value obtained by integrating the differential value output in the differentiation process over a unit time interval; a switch control process for switching the switch to an off state when the differential value reaches a threshold value; Execute The differentiation process is a program for outputting, as the differential value, a value obtained by differentiating the difference between the output voltage and the integral value.

[0059]

[10] The program according to [9], wherein the switch control process is a process of switching the switch to an off state when the differential value becomes equal to or greater than the threshold value.

[0060]

[11] The program according to [9] or

[10] , wherein the switch control process is a process of switching the switch to an off state when the differential value becomes equal to or less than the threshold value. [Explanation of symbols]

[0061] 10…Power supply device 20…Power circuit 21...Battery LA...High potential power line 22A…High potential output terminal 22B…Low potential output terminal 24...Power conversion circuit 25...Voltage detection section 30...First switch 31...Second switch 40...Control device 43...Differential processing section 44...Integration processing section 45...Switch control processing section 50...load PG: Voltage abnormality detection program

Claims

1. a battery capable of supplying power to a load via a power supply line; a switch located on the power supply line and switchable between an on state and an off state; a power conversion circuit located on the power supply line; a voltage detection unit that detects an output voltage to the load; a differential processing unit that outputs a differential value according to the output voltage; an integration processing unit that outputs an integral value obtained by integrating the differential value output by the differentiation processing unit over a unit time interval; a switch control processing unit capable of switching the switch to an off state; Equipped with the differential processing unit differentiates a difference between the output voltage and the integral value and outputs the differentiated value; The switch control processing unit switches the switch to an off state when the differential value reaches a threshold value. power supply.

2. The switch is located on the power supply line between the power conversion circuit and an output terminal for the load. The power supply device of claim 1 .

3. When the switch is a first switch, a second switch located on the power supply line between the battery and the power conversion circuit; When the differential value reaches the threshold value, the switch control processing unit switches the second switch to an OFF state, and then switches the first switch to an OFF state. The power supply device according to claim 2 .

4. The switch control processing unit switches the switch to an off state when the differential value becomes equal to or greater than the threshold value. The power supply device according to any one of claims 1 to 3.

5. The switch control processing unit switches the switch to an off state when the differential value becomes equal to or less than the threshold value. The power supply device according to any one of claims 1 to 3.

6. a battery capable of supplying power to a load via a power supply line; a switch located on the power supply line and switchable between an on state and an off state; a power conversion circuit located on the power supply line; a voltage detection unit that detects an output voltage to the load; The present invention is applied to a power supply circuit comprising: a differential processing unit that outputs a differential value according to the output voltage; an integration processing unit that outputs an integral value obtained by integrating the differential value output by the differentiation processing unit over a unit time interval; a switch control processing unit capable of switching the switch to an off state; Equipped with the differential processing unit differentiates a difference between the output voltage and the integral value and outputs the differentiated value; The switch control processing unit switches the switch to an off state when the differential value reaches a threshold value. Control device for power supply circuits.

7. The switch control processing unit switches the switch to an off state when the differential value becomes equal to or greater than the threshold value. The control device for a power supply circuit according to claim 6.

8. The switch control processing unit switches the switch to an off state when the differential value becomes equal to or less than the threshold value. The control device for a power supply circuit according to claim 6.

9. a battery capable of supplying power to a load via a power supply line; a switch located on the power supply line and switchable between an on state and an off state; a power conversion circuit located on the power supply line; a voltage detection unit that detects an output voltage to the load; a control device capable of switching the switch; The present invention relates to a power supply device comprising: The control device a differentiation process for outputting a differential value according to the output voltage; an integration process for outputting an integral value obtained by integrating the differential value output in the differentiation process over a unit time interval; a switch control process for switching the switch to an off state when the differential value reaches a threshold value; Execute The differentiation process is a process of differentiating the difference between the output voltage and the integral value and outputting the differentiated value as the differential value. program.

10. The switch control process is a process of switching the switch to an off state when the differential value becomes equal to or greater than the threshold value. The program according to claim 9.

11. The switch control process is a process of switching the switch to an off state when the differential value becomes equal to or less than the threshold value. The program according to claim 9.

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