JPS59220816A - Overcurrent detection system - Google Patents

Abstract

PURPOSE:To limit energy which flows in a load until an overcurrent is detected, and prevent the damage of the load from expanding by providing a means which change overcurrent detection points automatically according to the variation of the load. CONSTITUTION:An electronic computer system consists of a service processor 1, calculating device 7, storage device 8, and input device 9. The control part 4 of this processor 1 is connected to the control storage device 6 of the calculating device 7, power supplies 10-12 are respectively provided between the output register 23 of the processor 1 and the devices such as calculating device 7, storage device 8, and input device 9; and overcurrent detecting circuits 13 are provided to the devices 10-12 respectively. The comparing circuit 17 of this detecting circuit 13 compares the voltage drop VP across an overcurrent detection resistance 18 due to the output current of the power supply 10 with the output voltage VS of a subtracting circuit 16. Further, the circuit 16 outputs the subtraction value between the voltage of a reference voltage source 15 and the output of a D/A converter 14, and an abnormality detection signal is outputted when the comparison result of the circuit 17 shown VP<VS, preventing the damage of the load from extending.

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to an overcurrent detection method, and particularly to an overcurrent detection method for monitoring overcurrent in a power supply device used in an electronic device such as a Seiko computer system. [Background of the Invention] Generally, the constant load current is determined to be a fixed value, which is the sum of load current drift, setting error, load fluctuation, and margin. However, this method of determining the overcurrent detection setting does not require a large overcurrent detection setting value for electronic equipment with large load vibrations, for example, electronic equipment whose configuration changes frequently, such as an 11L slave meter system. Since there is a need to set it according to the heavy load, the difference between the regular load current value and the overcurrent detection set current value becomes large, and if the steady load current is flowing when the load is small, In this case, when an abnormality such as a load short circuit occurs, the energy flowing into the load becomes large when an overcurrent is detected, and the damage to the load increases due to the flowing energy. To avoid this, overcurrent detection b
It is necessary to change the level, but if overcurrent detection is performed using a fuse or breaker, etc., the fuse or breaker must be replaced, which is nearly impossible in practice. [Object of the Invention] The present invention has been made in view of the above-mentioned points.

[By providing a means to automatically change the overcurrent detection point, we have provided an overcurrent detection method that limits the energy flowing into the load before overcurrent is detected and prevents damage to the load from expanding.] purpose. [Summary of the invention]

The main points of the present invention are to provide a means for detecting the configuration of the electronic device in an electronic device where the load current θ1t changes due to a change in the system configuration such as a computer system, and a means for detecting the increase or decrease in output current that varies depending on the configuration of the electronic device. A means for changing an overcurrent detection setting value accordingly is provided, and the overcurrent detection circuit value is automatically changed in accordance with a change in the configuration of the electronic device. [Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings. . FIG. 1 is a block diagram showing a configuration example when the present invention is applied to an electronic computer system. In the figure, the electronic computer system is a service processor (hereinafter simply [5VPJ
1, arithmetic device 7, storage device 8, and input device 9
It is composed of 2. 5PVI detects overcurrent when the output current of each power supply device increases or decreases depending on the configuration of the floppy disk device 2 used for microprogram loading, the memory section 3, the control section 4 including a microprocessor, and the electronic computer. It is composed of an R (JM (read-on memory) 5) in which data for changing points is stored, a register 21, a decoder 22, and an output register. and is connected to the 5VPI control unit 4 by a data bus.Arithmetic unit 7, storage device 8,
The input/output device 9 includes power supplies jO, 11, and 12 that supply power to each of the three devices, and each of these power supplies includes an overcurrent detection circuit 13. FIG. 2 shows an embodiment of the overcurrent detection circuit 13, which includes an overcurrent detection resistor 18, a comparison circuit 17, a subtraction circuit 16, a D-A converter 14 connected to a control section 4 of a reference voltage power supply of 15.5 VPI, and seven 〇It consists of a groan control circuit. The operation of the overcurrent detection circuit described above is based on the power supply 10 (power supply 11.1
The comparator circuit 17 compares the voltage drop V of the overcurrent detection resistor 18 due to the output current of the overcurrent detection resistor 18 (which may be 2) and the output voltage v8 of the four circuits 16, and calculates the voltage drop F of the overcurrent detection resistor 180.
When the voltage exceeds the output voltage of the subtraction circuit 16, a voltage is generated on the output side of the comparison circuit 17 as an abnormality detection signal. The subtraction circuit 16 receives the reference voltage from the reference voltage power source I5 and 1) -A.
The output voltage of the converter 14 is input, and the reference voltage is set to JJ.
, the value subtracted by the output voltage of the -A converter 14 is input to the comparison circuit 17. Note that the reference voltage of the reference voltage power supply 150 is set to a value that allows overcurrent to be detected at the maximum rated output current 10α of the power supply 0. Now, when the computer system starts operating, the microprogram prestored in the floppy disk device 2 is loaded into the 5VPI memory section 3, and then transferred to the arithmetic unit 70 control storage device 6 by the 5VPI control section 4. will be transferred. At that time, the specific information in the computer control information representing the current configuration of the computer system included in the microprogram is read out from the memory unit 3 by the control unit 4 of the 5VPI and set in the register 21. The information set in this register 21 is converted by the decoder 22 into the corresponding address information of R U IV 5, which stores data for changing the overcurrent detection point of the power supply according to the system configuration, and the corresponding data is 1tsu1'A
ωt from 5ρ· is extracted and set in the output register path. The data set in this output register to change the overcurrent detection point is transmitted to the power supply unit "0" (or power supply unit (Red H112)
The above 5V is transferred to the L)-A converter 14 and its control circuit in the overcurrent detection circuit shown in FIG.
The data for changing the overcurrent detection point transferred by the command of the control unit 40 of the PI is transferred to the D- under the control of the control circuit 20.
The A converter 14 converts the voltage into an analog voltage. The output analog voltage of the DA converter 14 is subtracted from the reference voltage of the reference voltage power supply 150 by the subtraction circuit 16, and the subtracted low voltage V5 is input to the comparison circuit 17. In the comparator circuit 17, as described above, the voltage V is caused by the voltage drop across the overcurrent detection resistor 18. and the output voltage v5 of the subtraction circuit 16 are compared, and if the former exceeds the latter, an output appears in the comparison circuit 71, indicating that an overcurrent is detected. Note that the electronic fit computer system can increase or decrease the memory of the storage device 8, increase or decrease the channel trunk of the input/output device 9, or add a high-speed arithmetic device as an option to the arithmetic device 7.
If the configuration changes due to non-addition, etc., corresponding 1 of the electronic computer control information in the microprogram corresponds to the 2nd part.
The news will change. As a result, the address of it U M 5 in which data for changing the overcurrent detection point of the power supply is stored changes, and data for changing the overcurrent detection point according to the configuration is read out. Figure 3 is an example of data for changing the overcurrent detection point stored in the ROM5, where the X address indicates an increase or decrease in the system configuration, the Y address indicates each device, for example, Y200 indicates the memory of the storage device. , IY-01 is assigned to the channel trunk of the input/output device 9, Y202 is assigned to the logic unit of the arithmetic unit 8, and so on. XY20000 stores the subtraction information value 16A with the minimum memory capacity (for example, 2MB), and is 0100.
(4MB), 0O200 (6bytes), 0300
(8MB), the memory capacity has increased, and the subtraction information value is 14.
A, i2A, and IOA decrease. xy,=Q O02 stores the subtraction information value 35A when the high-speed arithmetic unit is not attached as an option to the arithmetic unit, and 0102 stores the subtraction information value 30A when the high-speed arithmetic unit is attached as an option. For example, when the data at address 000 of R (JM5) is read from the decoder n, the subtraction information value 16A is set in the output register O, and the control unit 40 commands U= The data is transferred to the A converter 14 and its control circuit side.In the above embodiment, the decoder 22 reads the data for changing the overcurrent detection point stored in the RUM5, but the computer system configuration information and Using an associative memory that stores multiple pairs of overcurrent detection point values, search this associative memory for information that matches the computer configuration information set in register 2I, and detect the filtration current from there. The point value may be read out.As described above, according to the present embodiment, the power supply device] 0 to 12
For example, data that causes the overcurrent detection circuit 130D-A converter 14 to change the overcurrent detection point according to the configuration of the computer system is transferred to the storage device 8 when loading the microprogram to the computer. The overcurrent detection point can be changed in accordance with the increase or decrease in the memory capacity of the power supply, the increase or decrease in the number of channel trunks of the input/output device, or the increase or decrease in the output power of the power supply due to the increase or decrease in the number of channel trunks of the input/output device, or the increase or decrease in the speed increase device as an option of the arithmetic unit 7. can be done automatically. In the above embodiment, an electronic computing system has been shown as an example, but the present invention can of course be applied to other electronic devices as long as the load current can be changed by changing the system configuration. [Effects of the Invention] As explained above, the overcurrent detection system according to the present invention changes the overcurrent detection setting value according to the configuration change of the electronic device, so that the overcurrent detection system can prevent overcurrent detection in the event of an accident such as a short circuit. This has the excellent effect of reducing the amount of energy flowing into the load before detection, preventing expansion of load selection, and eliminating the need to change fuses, breakers, etc. in response to load fluctuations.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the overall configuration when the overcurrent detection method of the present invention is applied to an electronic computer system, and Figure 2 is a block diagram showing the specific configuration of the overcurrent detection circuit in Figure 1. Figure 3 is a '1'' diagram showing an example of the data stored in itOA4 in Figure 1 to change the filtration flow detection point. 1... Service processor (SVP), 2... Floppy Disk device, 3...Memory unit, 5...)t
(JM, 6... Control storage device, 7... Arithmetic device, 8
...Storage device, 9...I/O device, 10~]2...
Power supply device, 13... over, current detection circuit, 14...L
)-A converter, 15... Reference voltage power supply, 16...
・Subtraction circuit, ]7... Comparison circuit, 18... Overcurrent detection resistor, 茄... Control circuit, 22... Decoder,
...Output register. ,・1 Representative Patent Attorney Makoto Suzuki ,1. i month 13 figure

Claims (1)

[Claims] (1) In an overcurrent detection method for a power supply device used in an electronic device whose load current changes due to a configuration change, a configuration detection means for detecting the configuration of the electronic device, and a configuration detection means for detecting an increase or decrease in output current that varies depending on the configuration of the electronic device are provided. 1. An overcurrent detection method, comprising: a set value changing means that changes a set value for overcurrent detection in response to a change in the configuration of the electronic device.