JP2000339040A - Power supply system and control method for power supply in the system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To variably apply output voltage and to stably apply optimum output voltage corresponding to each load. SOLUTION: The power supply system is constituted of loads (modules) 30, 40 having a function for detecting applied voltage and informing of a control part 20 of the detected voltage, the control part 20 for finding out an optimum voltage value based on a voltage value informed from the loads 30, 40, generating reference voltage and applying the reference voltage to a power supply device 10 and the power supply device 10 for outputting a power supply voltage level to the loads 30, 40 in accordance with the applied reference voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a power supply system capable of automatically adjusting a power supply voltage output from a power supply device to an arbitrary power supply voltage, and a supply voltage control method in the power supply system.

[0002]

2. Description of the Related Art Conventionally, in a power supply device for supplying power to an electronic device or the like (load), the power supply voltage changes due to a difference or a change in the load. For this reason, a method of automatically adjusting the power supply voltage output from the power supply device as shown in the following procedures (1) and (2) has been adopted (see FIG. 4).

(1) The power supply voltage output by the power supply itself is turned back on the load side and input to the power supply.

[0004] (2) The power supply device compares the power supply voltage that is fed back to the power supply device with a reference voltage that is prepared in the power supply device and that generates an arbitrary voltage to be output, and outputs the difference as an output of the power supply voltage. give feedback.

[0005] With this process, even if the power supply voltage output from the power supply device fluctuates depending on the magnitude of the load, the power supply device detects the changed difference from the reference voltage and applies feedback to the output of the power supply voltage. The load side can always receive a power supply voltage equivalent to the reference voltage.

[0006]

However, in the conventional power supply device described above, when there are a plurality of power supply targets, that is, when there are a plurality of loads, the voltage is automatically adjusted to the power supply voltage of only one load. (See FIG. 5). Therefore, when the load on the load side deviated from the automatic adjustment is larger than the load side automatically adjusted, the power supply voltage of the load falls below the reference. If the load deviating from the automatic adjustment is smaller, the power supply voltage of the load is higher than the reference. Therefore, it is hard to say that a difference occurs depending on the load and the automatic adjustment of the supply voltage is appropriately performed.

Further, as shown in FIG. 6, for example, when a power supply and a load are connected via a cable connection or another module, a voltage loss due to the cable or another module occurs together with a voltage fluctuation due to the load. Therefore, it is necessary to set a reference voltage in consideration of the loss. For this reason, the voltage loss differs depending on the system configuration and structure, so that a special measure is required when the power supply device is diverted.

In short, conventionally, as a method of automatically adjusting a voltage output from a power supply, a power supply voltage output from the power supply is fed back and a power supply voltage input is compared with a reference voltage prepared in the power supply. The automatic adjustment of the power supply voltage was performed based on the following.If there were multiple target loads, the automatic adjustment could not be performed considering all of them. In addition, there is a problem that it is necessary to assume a voltage loss when there is a module or the like.

Therefore, the present invention has been made in consideration of the above circumstances, and has been made to solve the above-mentioned problems, to make the output voltage variable, and to stably supply an optimum output voltage according to the load. It is an object of the present invention to provide a power supply system and a supply voltage control method in the power supply system.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention detects a power supply voltage of each of target loads,
The output voltage of the power supply device is adjusted based on the detected value.

That is, the voltage level of the supply voltage can be detected at each load side, an optimum voltage level is selected based on the detected voltage level, and a reference power supply is generated. The power supply is configured to be able to be performed. Further, the reference voltage is adjusted repeatedly until the detected voltage level reaches the target voltage level.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a power supply system according to the present embodiment.
And control unit 20, and a plurality of loads (electronic devices) 30, 40
It is composed of

The power supply 10 has a power supply function of supplying power to the loads 30, 40, and outputs a power supply voltage according to a reference voltage. The power supply device 10 includes a power supply voltage output unit 12 and an output voltage control unit 14 therein. The power supply voltage output unit 12 has a function of outputting a power supply voltage to each of the loads 30, 40 under the control of the output voltage control unit 14. The output voltage control unit 14 has a function of determining an output voltage from a reference voltage and controlling the power supply voltage output unit 12 based on the determination result.

The control section 20 has a function of generating a reference voltage based on the detected voltage value, and internally includes a voltage control section 22 and a reference voltage generation section 24. Voltage control unit 22
Has a control function of collecting digitized voltage values transmitted from the loads 30 and 40, determining an optimal voltage value, and transmitting information of the determination result to the reference voltage generation unit 14. is there. The reference voltage generation unit 24 includes the voltage control unit 22
Has a function of converting a voltage value into a control signal (level) such as a reference voltage based on an instruction from the device.

The loads 30, 40 are connected to voltage detectors 32, 42
And a module that operates with power supplied from the power supply device 10. The voltage detectors 32 and 42 have a function of detecting a voltage at each load and converting the voltage into a numerical value. The numerical data is transmitted to the voltage controller 22.

In the figure, the arrow 52 indicates the flow of the power supply.
Arrow 54 indicates the flow of the detected voltage, and arrow 56 indicates the flow of the control signal / control information.

FIG. 2 shows the operation and operation of the above configuration.
This will be described below with reference to the flowchart of FIG.

When power is supplied from the power supply device 10 to the loads 30, 40, the loads 30, 40 consume the supplied power and start operating. Then, the internal voltage detectors 32, 4
2 to monitor the voltage and send information on the detected voltage level to the control unit 20 via an arbitrary interface such as a serial bus (step S202). Control unit 20
Then, the voltage levels detected by the loads 30 and 40 are fetched via an arbitrary interface, and a voltage level that can be optimized for the loads 30 and 40 is obtained based on the values. Then, a reference voltage having the voltage level is generated and supplied to the power supply device (step S204).
In the power supply device 10, a comparison is made with a voltage output based on the reference power supply from the control unit 20, and adjustment is performed so that the voltage level of the output power supply becomes the same as the reference voltage level (step S206). . Thus, steps S202 to S2
The processing of step 06 is repeated until the control unit 20 determines that the power supply voltage is optimum, and the power supply voltage is automatically adjusted (step S208).

According to the above-described embodiment, the load 30, 40 detects the level of the supply voltage, compares the detected level with the target voltage level, and performs a process of approaching the target voltage, thereby obtaining the load 30. , 40 and the power supply 10 do not need to take measures such as voltage drop. Also, a plurality of loads 30,
Even when the power supply 40 is connected, the control unit 20 detects the level of the supply voltage on each of the loads 30 and 40 to detect the level of the supply voltage.
Thus, an appropriate supply voltage level can be selected. For example, there is a difference of 0.3 V between each of the loads 30 and 40, usually 5
Even if the load is desired to be operated at V, both loads are supplied with 5 V or more (5.3 V and 5.0 V), or an intermediate voltage between the loads 30 and 40 (5.15 V and 4.15 V).
85 V) can be selected.

FIG. 3 shows a modification of the above embodiment, and the same parts / functions are given the same reference numerals and described.

In this modification, an external input device 60 is added to the voltage control section 22 so that data of an arbitrary voltage level can be input from the external input device 60. This makes it possible to adjust the power supply voltage supplied to the loads 30, 40 to that voltage. With this feature,
This facilitates the adjustment of the voltage in the voltage margin test in the evaluation and the voltage adjustment when the voltage must be adjusted due to external factors.

[0023]

As described above in detail, according to the present invention, the output voltage to be supplied can be automatically adjusted to an optimum output voltage according to the load, and thus a stable voltage supply can be realized. It is.

That is, in the prior art, the power supply voltage output from the power supply is turned back and input, and the power supply voltage is automatically adjusted based on comparison with a reference voltage prepared in the power supply. In the case where there is a plurality, or when a voltage loss occurs between the target load and the power supply device, it is difficult to automatically adjust the supply voltage optimally, but according to the present invention,
The power supply voltage of each of the target loads is detected, and the output voltage of the power supply device can be adjusted based on the detected value.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a power supply system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of supply voltage adjustment processing according to the embodiment;

FIG. 3 is an exemplary block diagram showing a schematic configuration of a power supply system of a modified example according to the embodiment;

FIG. 4 is a diagram showing an example of a conventional voltage control in the case of one load.

FIG. 5 is a diagram showing an example of conventional voltage control when there are a plurality of loads.

FIG. 6 is a diagram showing an example of voltage control when a conventional load and other factors are added.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Power supply device, 12 ... Power supply voltage output part, 14 ... Output voltage control part, 20 ... Control part, 22 ... Voltage control part, 24 ... Reference voltage generation part, 30, 40 ... Load, 32, 42 ... Voltage detection part .

Claims (4)

[Claims] In a power supply system having a power supply device for supplying power to a plurality of load devices, voltage detection means for detecting a voltage supplied to each of the load devices, and voltage detected by the voltage detection means. Control means for outputting control information for controlling the supply voltage with reference to the voltage level information; and power supply voltage output means for adjusting and controlling the supply voltage to each of the load devices based on the control information from the control means. Power supply system characterized by the above-mentioned. 2. A fetching means for fetching the voltage information supplied to each of the load devices each time, a comparing means for comparing the fetched voltage information with target supply voltage information each time, and a comparison result of the comparing means. 2. The power supply system according to claim 1, further comprising means for adjusting the supply voltage each time based on the power supply. 3. In a power supply system having a power supply device for supplying power to a plurality of load devices, a voltage supplied to each of the load devices is detected, and the supply is performed by referring to the detected voltage level information. A supply voltage control method in a power supply system, comprising outputting control information for controlling a voltage, and adjusting and controlling a supply voltage to each of the load devices based on the control information. 4. A voltage information supplied to each of the load devices is fetched each time, the fetched voltage information is compared with a target supply voltage information each time, and the supply voltage is adjusted each time based on the comparison result. The supply voltage control method in the power supply system according to claim 3, wherein