JP2002268757A - Power source controller and power source control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a stable fixed voltage to a circuit connected to an output line. SOLUTION: An input voltage from an input terminal 7 is regulated by a plurality of regulators 1-3, and the outputs of those regulators 1-3 are charged by stabilized capacitors 4-6, and at the time of outputting voltages charged by the stabilized capacitors 4-6 from output lines 8-10, the timings of the outputs of those regulators 1-3 are shifted so as to be made different from each other according to control signals from delay circuits 16 and 17 so that rush currents to be generated when the regulators 1-3 are started can be dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device and a power supply control method for dispersing an inrush current generated when a regulator rises.

[0002]

2. Description of the Related Art In a conventional power supply control device, as shown in FIG. 4, for example, when an input voltage from an input terminal 7 is input to regulators 1 to 3, the regulators 1 to 3 simultaneously perform constant voltage control. After the corresponding stabilizing capacitors 4 to 6 are charged, a constant voltage is output from each of the corresponding output lines 8 to 10 as a circuit power supply.

[0003]

In the above-described conventional power supply control device, when the input voltage from the input terminal 7 is simultaneously controlled by the regulators 1 to 3 at a constant voltage, for example, as shown in FIG. The rising timings at 1 to 3 are simultaneous, and the inrush currents when charging the corresponding stabilizing capacitors 4 to 6 and the inrush currents to the circuits connected to the output lines 8 to 10 are all simultaneous. For this reason, the voltage drop fluctuations of the input voltage from the input terminal 7 and the output voltages from the output lines 8 to 10 are increased, which adversely affects the circuits connected to the regulators 1 to 3.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and aims to supply a stable constant voltage to a circuit connected to an output line by dispersing an inrush current generated when a regulator rises. It is possible to provide a power supply control device and a power supply control method that can perform the above.

[0005]

According to a first aspect of the present invention, there is provided a power supply control device comprising: a plurality of regulators for controlling an input voltage from an input terminal to a constant voltage; a stabilizing capacitor for charging outputs of the plurality of regulators; An output line for outputting a voltage charged in the stabilizing capacitor, wherein output timings of the plurality of regulators are shifted so as to be different from each other. Further, the output timings of the plurality of regulators can be determined based on control signals from delay circuits having different delay times. Further, the delay circuit can count the RTC clock from the RTC to determine the delay time. Further, an input voltage from an input terminal can be supplied to the delay circuit. Further, the voltage from the backup battery to the RTC can be supplied to the delay circuit. The power supply control method according to claim 6, wherein a first step of controlling the input voltage from the input terminal to a constant voltage by a plurality of regulators, and a second step of charging the outputs of the plurality of regulators by a stabilizing capacitor. A third step of outputting the voltage charged in the stabilizing capacitor from the output line, and a fourth step of shifting the output timings of the plurality of regulators so as to be different from each other. Further, the second step may include a fifth step of determining output timing based on control signals from delay circuits having different delay times. In addition, the fifth step may include a sixth step of determining a delay time by counting an RTC clock from the RTC. In addition, the fifth step may include a seventh step of supplying an input voltage from the input terminal. In addition, the sixth step may include an eighth step of supplying a voltage from the backup battery to the RTC. In the power supply control device and the power supply control method according to the present invention, the input voltage from the input terminal is controlled at a constant voltage by the plurality of regulators, the outputs of the plurality of regulators are charged by the stabilizing capacitors, and the stabilizing capacitors are charged. When the output voltages are output from the output line, the output timings of the plurality of regulators are shifted so as to be different from each other, thereby dispersing the rush current generated when the regulators rise.

[0006]

Embodiments of the present invention will be described below. In the drawings described below, portions common to FIG. 4 are denoted by the same reference numerals.

FIG. 1 is a diagram showing an embodiment of the power supply control device of the present invention, FIG. 2 is a diagram showing another embodiment in which the configuration of the power supply control device of FIG. 1 is changed, and FIG. FIG. 3 is a diagram for describing a power control method in the power control device of FIGS. 1 and 2.

As shown in FIG. 1, the power supply control device comprises regulators 1 to 3, stabilizing capacitors 4 to 6, input terminals 7, output lines 8 to 10, backflow prevention diode 11, current limiting resistor 12, and backup battery 13. , RTC14,
RTC clock output line 15, delay circuits 16, 17,
Power input lines 18, 19, ON / OFF control line 2
0,21.

The regulators 1 to 3 control the input voltage from the input terminal 7 at a constant voltage. The stabilizing capacitors 4 to 6 charge the outputs of the regulators 1 to 3. The input terminal 7 receives an input voltage.

Output lines 8 to 10 are connected to regulators 1 to
3 outputs a constant voltage. The backflow prevention diode 11 prevents backflow. The current limiting resistor 12 limits the current.

The backup battery 13 is a backup for the RTC 14. The RTC 14 generates a predetermined RTC clock. RTC clock output line 15
It outputs the RTC clock from C14.

The delay circuits 16 and 17 count the clock from the RTC clock output line 15 to determine a delay time. The power supply input lines 18 and 19 supply the input voltage from the input terminal 7 to the delay circuits 16 and 17. The ON / OFF control lines 20, 21 are
It outputs a control signal for controlling the outputs of the regulators 2 and 3.

Next, a power supply control method in the power supply control device having such a configuration will be described.

First, the input voltage from the input terminal 7 is controlled to a constant voltage by being input to the regulator 1 and charged in the stabilizing capacitor 4, then output from the output line 8 and supplied as circuit power. .

The constant voltage output from the regulator 1 is supplied to the RTC 14 via the backflow prevention diode 11, and the RTC clock is supplied from the RTC 14 to the RTC clock.
It is output via the C clock output line 15. Also,
The output from the backflow prevention diode 11 is the current limiting resistor 1
2, the backup battery 13 is charged.

The input voltage from the input terminal 7 is input to the regulator 2, but in this state, the output line 9
No output from. At this time, the delay circuit 16
The RTC clock from the TC clock output line 15 is counted, and when an arbitrary count value is reached, the regulator 2 is turned off from the ON / OFF control line 20 for the first time.
And outputs a control signal for causing N. Thus, when the regulator 2 is turned on, the output of the regulator 2 is charged into the stabilizing capacitor 5 and then output as a constant voltage from the output line 9.

The input voltage from the input terminal 7 is input to the regulator 3, but in this state, the output line 1
No output from 0 is performed. At this time, the delay circuit 17 counts the RTC clock from the RTC clock output line 15, and when the count reaches an arbitrary count value different from the arbitrary count value set by the delay circuit 16, the ON / OFF control line is first turned on. 21 outputs a control signal for turning on the regulator 3. Thus, when the regulator 3 is turned on, the output of the regulator 3 is charged to the stabilizing capacitor 6 and then output as a constant voltage from the output line 10.

With the above operation, the regulator 1
The outputs of the regulators 2 and 3 are shifted from each other. Therefore, as shown in FIG.
And the rush current to the circuits connected to the output lines 8 to 10 when the battery is charged.

As described above, in the present embodiment, the input voltage from the input terminal 7 is controlled at a constant voltage by the plurality of regulators 1 to 3, and the outputs of the plurality of regulators 1 to 3 are controlled by the stabilizing capacitors 4 to 6. When outputting the voltage charged in the stabilizing capacitors 4 to 6 from the output lines 8 to 10, the output timings of the plurality of regulators 1 to 3 are controlled by control signals from the delay circuits 16 and 17.
Since they are shifted from each other so as to disperse the rush current generated when the regulators 1 to 3 rise, a stable constant voltage can be supplied to the circuits connected to the output lines 8 to 10.

In this embodiment, the delay circuit 16,
Although the description has been given of the case where the voltage is supplied from the power supply input lines 18 and 19 to the power supply line 17, the power supply input lines 18 and 19 are connected to the current limiting resistor 12 as shown in FIG. In this configuration, the voltage of the backup battery 13 is
6 and 17 may be supplied.
As described above, the inrush current is dispersed, and a stable constant voltage can be supplied to the circuit.

In this embodiment, the regulator 1
Although the description has been given of the case where three are set to three, it is needless to say that the present invention is not limited to this example, and may be two or four or more.

[0022]

As described above, according to the power supply control device and the power supply control method of the present invention, the input voltage from the input terminal is
The constant voltage control is performed by a plurality of regulators, the outputs of the plurality of regulators are charged by a stabilizing capacitor, and when the voltage charged in the stabilizing capacitor is output from an output line, the output timings of the plurality of regulators are different from each other. And a rush current generated when the regulator rises is dispersed, so that a stable constant voltage can be supplied to the circuit connected to the output line.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a power supply control device of the present invention.

FIG. 2 is a diagram showing another embodiment in which the configuration of the power supply control device of FIG. 1 is changed.

FIG. 3 is a diagram for explaining a power control method in the power control device of FIGS. 1 and 2;

FIG. 4 is a diagram illustrating an example of a conventional power supply control device.

FIG. 5 is a diagram for explaining an operation of the power supply control device of FIG. 4;

[Explanation of symbols]

 1-3 Regulator 4-6 Stabilizing capacitor 7 Input terminal 8-10 Output line 11 Backflow prevention diode 12 Current limiting resistor 13 Backup battery 14 RTC 15 RTC clock output line 16,17 Delay circuit 18,19 Power input line 20,21 ON / OFF control line

Claims (10)

[Claims] 1. A plurality of regulators for controlling an input voltage from an input terminal at a constant voltage, a stabilizing capacitor for charging outputs of the plurality of regulators, and an output line for outputting a voltage charged in the stabilizing capacitor. Wherein the output timings of the plurality of regulators are shifted so as to be different from each other. 2. The power supply control device according to claim 1, wherein the output timings of the plurality of regulators are determined based on control signals from delay circuits having different delay times. 3. The power supply control device according to claim 2, wherein the delay circuit determines the delay time by counting an RTC clock from an RTC. 4. The power supply control device according to claim 2, wherein an input voltage from an input terminal is supplied to the delay circuit. 5. The power supply control device according to claim 3, wherein a voltage from a backup battery to the RTC is supplied to the delay circuit. 6. A first step of controlling the input voltage from an input terminal by a plurality of regulators at a constant voltage, a second step of charging the outputs of the plurality of regulators with a stabilizing capacitor, and the stabilizing capacitor. And a fourth step of shifting the output timings of the plurality of regulators so that they are different from each other. 7. The method according to claim 6, wherein the second step includes a fifth step of determining the output timing based on control signals from delay circuits having different delay times. Power control method as described. 8. The method according to claim 5, wherein the fifth step includes an RTC from an RTC.
6th for determining the delay time by counting C clocks
The power supply control method according to claim 7, further comprising the step of: 9. The power supply control method according to claim 7, wherein said fifth step includes a seventh step of supplying an input voltage from an input terminal. 10. The method according to claim 8, wherein the sixth step includes an eighth step of supplying a voltage from a backup battery to the RTC.