JP2015220918A - Power control device and base station device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch over to standby system power without producing an instantaneous interruption caused by a decreased voltage of working system power, at the time of the blackout of the working system power.SOLUTION: A power control device includes a judgment unit and a switchover unit. The judgment unit compares a first voltage which changes according to the voltage of the working system power with a second voltage in which a fluctuation speed changes slower than the fluctuation speed of the first voltage according to the voltage, so as to judge first timing in which the first voltage falls lower than the second voltage. The switchover unit switches the power of the working system to the power of the standby system at the first timing judged by the judgment unit.

Description

  The present invention relates to a power supply control device and a base station device.

  Conventionally, there is a power supply control device that controls a power supply for supplying operating power to an external device such as a base station device. The power supply control device switches to the standby power supply in the event of a power failure of the active power supply. As such a power supply switching method, for example, a power supply switching method using a predetermined threshold is known.

  In the power supply switching method using a predetermined threshold, the operating system power supply voltage is monitored, and the operating system power supply is switched to the standby system power supply at a timing when the operating system power supply voltage falls below the predetermined threshold value. The predetermined threshold is defined in advance as a constant value so that a device using the voltage of the operating power supply operates normally.

JP-A-9-243676

  However, with the above-described conventional technology, it is difficult to switch to a standby power supply without causing an instantaneous interruption due to a drop in the voltage of the active power supply during a power failure of the active power supply. There's a problem.

  That is, in the above-described conventional technology, when the operating power supply voltage drops below a predetermined threshold during a power failure of the operating power supply, the difference between the operating power supply voltage and the standby power supply voltage is different. In the increased state, switching to the standby power supply is performed. When switching to the standby power supply is performed in a state where the difference between the voltage of the active power supply and the voltage of the standby power supply has increased, the voltage of the active power supply and the voltage of the standby power supply With this difference, an inrush current flows from the standby power supply to the external device. For this reason, the supply of power from the standby power supply is hindered by the inrush current, and as a result, there is a possibility that instantaneous interruption of the entire system may occur.

  The disclosed technology has been made in view of the above, and at the time of a power failure of the operating power supply, switching to the standby power supply without causing an instantaneous interruption due to a drop in the voltage of the operating power supply. An object of the present invention is to provide a power control apparatus and a base station apparatus that can be used.

  In one aspect, a power supply control device disclosed in the present application includes a determination unit and a switching unit. The determination unit compares the first voltage that varies according to the voltage of the power supply of the operating system and the second voltage that varies at a variation rate slower than the variation rate of the first voltage according to the voltage. Thus, the first timing at which the first voltage is lower than the second voltage is determined. The switching unit switches the operating power source to the standby power source at the first timing determined by the determining unit.

  According to one aspect of the power supply control device disclosed in the present application, at the time of a power failure of the active power supply, switching to the standby power supply is performed without causing an instantaneous interruption due to a decrease in the voltage of the active power supply. There is an effect that can be.

FIG. 1 is a diagram illustrating a configuration example of a power control system including a power control device according to the present embodiment. FIG. 2 is a diagram illustrating an example of a detailed configuration of the determination unit and the SW unit in the first embodiment. FIG. 3 is a time chart showing voltage values of each part of the power supply control device at the time of a power failure of the operation power supply. FIG. 4 is a time chart showing voltage values of each part of the power supply control device when the operating power supply is restored. FIG. 5 is a diagram for explaining voltage values and transistor states of each part of the power supply control device at each time point shown in FIG. FIG. 6 is a diagram illustrating a modification of the power supply control system.

  Hereinafter, embodiments of a power supply control device and a base station device disclosed in the present application will be described in detail with reference to the drawings. The disclosed technology is not limited by this embodiment.

  First, a configuration example of a power control system including a power control device according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration example of a power control system including a power control device according to the present embodiment.

  As shown in FIG. 1, the power supply control system 1 according to the present embodiment is connected to an operating power supply 10-1 to 10-n and a standby power supply 11 that backs up the operating power supply 10-1 to 10-n. The power supply control system 1 is connected to base station apparatuses 20-1 to 20-n to which operating power is supplied from the operational power supplies 10-1 to 10-n or the standby power supply 11. The power supply control system 1 includes power supply control devices 100-1 to 100-n. Each of the power supply control devices 100-1 to 100-n is connected in association with each of the operation power supplies 10-1 to 10-n and is connected to one standby power supply 11. In the following description, the operation power supplies 10-1 to 10-n are referred to as “operation power supply 10” unless otherwise distinguished. In the following description, when the power control devices 100-1 to 100-n are not particularly distinguished, they are referred to as “power control device 100”. Hereinafter, the base station devices 20-1 to 20-n are referred to as “base station device 20” unless otherwise distinguished.

  The power supply control device 100 includes a determination unit 110 and a switch (SW) unit 120. The determination unit 110 compares the first voltage that varies according to the voltage of the operating power supply 10 and the second voltage that varies at a slower fluctuation speed than the first voltage according to the voltage of the operating power supply 10. Thus, the first timing at which the first voltage falls below the second voltage is determined. Here, the second voltage is converged to a predetermined voltage obtained from the voltage of the standby power supply 11 when the voltage of the operation power supply 10 is not supplied. For this reason, when the voltage of the operation power supply 10 is not supplied, the second voltage does not become 0V even if the first voltage decreases toward 0V. The SW unit 120 switches the operation power supply 10 to the standby power supply 11 at the first timing determined by the determination unit 110. As a result, operating power is supplied from the standby power supply 11 to the base station apparatus 20 via the SW unit 120.

  The determination unit 110 also determines a second timing at which the first voltage rises higher than the second voltage converged to a predetermined voltage after the operating power supply 10 is switched to the standby power supply 11 by the SW unit 120. To do. Then, the SW unit 120 switches the standby power supply 11 to the operational power supply 10 at the second timing determined by the determination unit 110. As a result, operating power is supplied from the operational power supply 10 to the base station apparatus 20 via the SW unit 120.

  As described above, the power supply control device 100 according to the present embodiment fluctuates at the first voltage that varies according to the voltage of the operating power supply 10 and at a fluctuating rate that is slower than the first voltage according to the voltage of the operating power supply 10. Compare with the second voltage. Then, the power supply control device 100 switches the operation power supply 10 to the standby power supply 11 at the first timing when the first voltage is lower than the second voltage.

  For this reason, according to the present embodiment, at the time of a power failure of the operating power supply 10, switching from the operating power supply 10 to the standby power supply 11 is performed in a state where the difference between the voltage of the operating power supply 10 and the voltage of the standby power supply 11 is suppressed. be able to. Therefore, it is possible to suppress an inrush current from the standby power supply 11 to the base station device 20 that is generated due to the difference between the voltage of the operational power supply 10 and the voltage of the standby power supply 11. As a result, according to the present embodiment, it is possible to switch to the standby power supply 11 without causing an instantaneous interruption due to a decrease in the voltage of the operational power supply 10 when the operational power supply 10 is interrupted.

  In addition, the power supply control device 100 according to the present embodiment has a second timing at which the first voltage rises higher than the second voltage converged to a predetermined voltage after the operating power supply 10 is switched to the standby power supply 11. The standby power supply 11 is switched to the operational power supply 10.

  For this reason, according to the present embodiment, when the voltage of the operating power supply 10 increases as the operating power supply 10 is restored, switching from the standby power supply 11 to the operating power supply 10 can be performed appropriately.

  Next, an example of a detailed configuration of the determination unit 110 and the SW unit 120 illustrated in FIG. 1 will be described with reference to FIG. FIG. 2 is a diagram illustrating an example of a detailed configuration of the determination unit and the SW unit in the first embodiment. In the example of FIG. 2, the detailed configuration of the power supply control device 100-1 will be described, and the detailed configuration of the power supply control devices 100-2 to 100-n will not be described. In the example of FIG. 2, it is assumed that the operation power supply 10 has not failed. In the example of FIG. 2, the voltage is lower as the ground voltage CG is closer to 0V.

  As shown in FIG. 2, the determination unit 110 includes a first voltage dividing circuit 111, a second voltage dividing circuit 112, a capacitor C1, a comparator IC1, and a diode D3.

  The first voltage dividing circuit 111 generates a first voltage Vin1 that varies according to the voltage V1 of the operating power supply 10-1 by dividing the voltage V1 of the operating power supply 10-1. Specifically, the first voltage dividing circuit 111 includes a resistor group connected in series to the operating power supply 10-1, and uses the resistor group connected in series to the operating power supply 10-1. The first voltage Vin1 is generated by dividing the first voltage V1. For example, in FIG. 2, it is assumed that the voltage V1 of the operating power supply 10-1 is −48V and the resistors R1 and R2 connected in series to the operating power supply 10-1 are 10 kΩ and 10 kΩ, respectively. In this case, the first voltage dividing circuit 111 generates the first voltage Vin1 = −24V by dividing the voltage V1 of the operation power supply 10-1 using −48 × 10 / (10 + 10). The first voltage Vin1 generated by the first voltage dividing circuit 111 is applied to the comparator IC1.

  The second voltage dividing circuit 112 generates a voltage Vin2 ′ lower than the first voltage Vin1 by dividing the operating power supply 10-1. Specifically, the second voltage dividing circuit 112 includes a resistance group connected in series to the operating power supply 10-1, and uses the resistance group connected in series to the operating power supply 10-1. The voltage Vin2 ′ is generated by dividing the voltage V1 of 1. For example, in FIG. 2, it is assumed that the voltage V1 of the operating power supply 10-1 is −48V and the resistors R3 and R4 connected in series to the operating power supply 10-1 are 120 kΩ and 100 kΩ, respectively. In this case, the second voltage dividing circuit 112 divides the voltage V1 of the operation power supply 10-1 using −48 × 100 / (100 + 120), so that the voltage Vin2 ′ = − lower than the first voltage Vin1. 22V is generated.

  The capacitor C1 stores the electric charge according to the voltage Vin2 ′ lower than the first voltage Vin1, so that the second that fluctuates at a slower fluctuation speed than the first voltage Vin1 according to the voltage V1 of the operation power supply 10-1. The voltage Vin2 is generated. Specifically, the capacitor C1 is connected in parallel to the second voltage dividing circuit 112, and stores a charge corresponding to the voltage Vin2 ′ generated by the second voltage dividing circuit 112, whereby the second voltage Vin2 is stored. Is generated. In the example illustrated in FIG. 2, the voltage Vin2 ′ generated by the second voltage dividing circuit 112 is −22V. In this case, the capacitor C <b> 1 generates the second voltage Vin <b> 2 = −22 V by storing electric charge according to the voltage Vin <b> 2 ′. The fluctuation speed of the second voltage Vin2 is slower than the fluctuation speed of the first voltage Vin1 generated by the first voltage dividing circuit 111. Here, the fluctuation speed refers to the fluctuation amount of the voltage per unit time. The second voltage Vin2 generated by the capacitor C1 is applied to the comparator IC1.

  The comparator IC1 compares the first voltage Vin1 generated by the first voltage dividing circuit 111 with the second voltage Vin2 generated by the capacitor C1. The comparator IC1 outputs the first signal when the first voltage Vin1 is lower than the second voltage Vin2. On the other hand, when the first voltage Vin1 is higher than the second voltage Vin2, the comparator IC1 outputs a second signal having a voltage different from that of the first signal. The second signal is a signal indicating a first timing at which the first voltage Vin1 is lower than the second voltage Vin2.

  In the example shown in FIG. 2, the first voltage Vin1 generated by the first voltage dividing circuit 111 is −24V, and the second voltage Vin2 generated by the capacitor C1 is −22V. In this case, since the first voltage Vin1 is higher than the second voltage Vin2, the comparator IC1 outputs a signal having the voltage V1 of the operation power supply 10-1 as the first signal. That is, when the first voltage Vin1 is higher than the second voltage Vin2, the voltage Vout1 at the output terminal of the comparator IC1 becomes the voltage V1 of the operation power supply 10-1. On the other hand, the comparator IC1 outputs a signal having the ground voltage CG as the second signal when the first voltage Vin1 drops below the second voltage Vin2 due to the power failure of the operation power supply 10-1. That is, when the first voltage Vin1 is lower than the second voltage Vin2, the voltage Vout1 at the output terminal of the comparator IC1 becomes the ground voltage CG.

  In addition, the comparator IC1 outputs the first signal again when the first voltage Vin1 is higher than the second voltage Vin2 converged to a predetermined voltage by the diode D3. In this case, after the operation power supply 10-1 is switched to the standby power supply 11 by the SW unit 120, the first voltage Vin1 is higher than the second voltage Vin2 converged to a predetermined voltage. A second timing is shown.

  The diode D3 is connected to the capacitor C1. The diode D3 converges the second voltage Vin2 toward a predetermined voltage obtained from the voltage of the standby power supply 11 when the voltage V1 of the operation power supply 10-1 is not supplied. For example, in FIG. 2, one end of the diode D3 is connected to the capacitor C1, and the other end of the diode D3 is connected to resistors R12 and R13 connected in series to the operation power supply 10-1 and the standby power supply 11. The resistors R12 and R13 are 100 kΩ and 180 kΩ, respectively. The voltage V1 of the operating power supply 10-1 is -48V, and the voltage V2 of the standby power supply 11 is -48V. In this case, when the voltage V1 of the operation power supply 10-1 is not supplied, the diode D3 is directed to −17V that is a voltage obtained by −48 × 100 / (100 + 180) using the voltage V2 of the standby power supply 11. To converge the second voltage Vin2.

  Further, as shown in FIG. 2, the SW unit 120 includes a transistor TR1, a transistor TR2, and a transistor TR3.

  The transistor TR1 is a bipolar transistor connected to the output terminal of the comparator IC1 of the determination unit 110 via the diode D4. The transistor TR1 switches between the operation power supply 10-1 and the standby power supply 11 by controlling ON / OFF of the transistor TR2 and the transistor TR3 according to the output signal output from the comparator IC1. For example, in the configuration illustrated in FIG. 2, it is assumed that a first signal having the voltage V1 of the operational power supply 10-1 is output as an output signal from the comparator IC1. In this case, the voltage V1 of the operating power supply 10-1 is applied to the base of the transistor TR1, and the voltage V1 of the operating power supply 10-1 is applied to the emitter of the transistor TR1. Then, the transistor TR1 switches itself to OFF, thereby setting the transistor TR2 to ON and setting the transistor TR3 to OFF. Then, voltage V1 of operating power supply 10-1 is applied from operating power supply 10-1 to load 130 via transistor TR2. The load 130 corresponds to the base station apparatus 20-1 illustrated in FIG.

  For example, in the configuration illustrated in FIG. 2, a case is assumed in which a second signal having the ground voltage CG is output as an output signal from the comparator IC1. In this case, -21V obtained from the voltage V2 of the standby power supply 11 is applied to the base of the transistor TR1, and -48V from the voltage V2 of the standby power supply 11 is applied to the emitter of the transistor TR1. Then, the transistor TR1 sets itself to ON, thereby setting the transistor TR2 to OFF and setting the transistor TR3 to ON. Then, the voltage V2 of the standby power supply 11 is applied from the standby power supply 11 to the load 130 via the transistor TR3. That is, the SW unit 120 switches the operation power supply 10-1 to the standby power supply 11 at the first timing determined by the determination unit 110 by causing the transistor TR1, the transistor TR2, and the transistor TR3 to cooperate.

  Further, when switching to the standby power supply 11 is performed, the transistor TR1 outputs a signal indicating that to the power supply control apparatus 100 other than the power supply control apparatus 100-1. Specifically, the transistor TR1 outputs a signal having the collector voltage Vout2 of the transistor TR1 to the power supply control devices 100-2 to 100-n as a signal indicating that the switching to the standby power supply 11 has been performed. Here, it is assumed that the voltage Vout2 at the collector of the transistor TR1 changes from -21V to -48V as the standby power supply 11 is switched. In this case, the transistor TR1 outputs a signal of voltage Vtout = −48V to the power supply control devices 100-2 to 100-n as a signal indicating that the switching to the standby power supply 11 has been performed.

  When the power supply control device 100-1 receives a signal of −48V from another power supply control device as a signal indicating that the switching to the standby power supply 11 has been performed, the power supply control device 100-1 is connected to the base of the transistor TR1. The voltage Vtin = −48V is applied. On the other hand, the voltage V1 = −48V of the operational power supply 10-1 is applied to the emitter of the transistor TR1. Then, the transistor TR1 switches itself to OFF, thereby setting the transistor TR2 to ON and setting the transistor TR3 to OFF. As a result, even when the second signal having the ground voltage CG is output as the output signal from the comparator of the determination unit 110, the operation power supply is supplied from the operation power supply 10-1 to the load 130 via the transistor TR2. A voltage V1 of 10-1 is applied. That is, the SW unit 120 is a case where the first timing is determined by the determination unit 110 when a signal indicating that switching to the standby power supply 11 has been performed from another power supply control device. However, the switching from the operating power supply 10-1 to the standby power supply 11 is stopped.

  The transistor TR2 is a field effect transistor, and applies the voltage V1 of the operation power supply 10-1 to the load 130 when set to ON by the transistor TR1.

  The transistor TR3 is a field effect transistor, and applies the voltage V2 of the standby power supply 11 to the load 130 when set to ON by the transistor TR1.

  Next, the processing procedure of the power supply switching process by the power supply control apparatus 100 according to the present embodiment will be described with reference to FIGS. FIG. 3 is a time chart showing voltage values of each part of the power supply control device at the time of a power failure of the operation power supply. FIG. 4 is a time chart showing voltage values of each part of the power supply control device when the operating power supply is restored. FIG. 5 is a diagram for explaining voltage values and transistor states of each part of the power supply control device at each time point shown in FIG. 3 to 5, “Vin1” indicates the first voltage Vin1 generated by the first voltage dividing circuit 111, “Vin2” indicates the second voltage Vin2 generated by the capacitor C1, “V1 (10-1)” indicates the voltage V1 of the operational power supply 10-1. In FIG. 5, “V1 (10-2)” indicates the voltage V1 of the operation power supply 10-2, “Vout1” indicates the voltage Vout1 at the output terminal of the comparator IC1, and “Vout2” indicates the transistor The voltage Vout2 at the collector of TR1 is shown. In FIG. 5, “Vtin” indicates a voltage Vtin applied from another power supply control device 100 to the base of the transistor TR1. “Vtout” indicates a voltage Vtout of a signal output from the transistor TR1 to another power supply control device 100. In the description of FIGS. 3 to 5, it is assumed that the voltage decreases as the ground voltage CG = 0V.

  First, power supply switching processing by the power supply control device 100-1 at the time of a power failure of the operational power supply 10-1 will be described. As shown in FIG. 3 and FIG. 5, when the operating power supply 10-1 fails, the voltage V1 of the operating power supply 10-1 starts to decrease toward 0V. Then, both the first voltage Vin1 and the second voltage Vin2 are lowered according to the voltage V1 of the operational power supply 10-1. However, the fluctuation speed of the second voltage Vin2 is slower than the fluctuation speed of the first voltage Vin1.

  The first voltage Vin1 is lower than the second voltage Vin2 when the time T1 elapses after the operation power supply 10-1 fails. For this reason, the comparator IC1 of the determination unit 110 outputs a signal having the ground voltage CG as a signal indicating the first timing. That is, when the time T1 elapses after the operation power supply 10-1 fails, the voltage Vout1 at the output terminal of the comparator IC1 becomes 0 V, which is the voltage of the ground voltage CG. Then, -21V obtained from the voltage V2 of the standby power supply 11 is applied to the base of the transistor TR1 of the SW section 120, and -48V from the voltage V2 of the standby power supply 11 is applied to the emitter of the transistor TR1. . Then, the transistor TR1 sets itself to ON, thereby setting the transistor TR2 to OFF and setting the transistor TR3 to ON. Then, the voltage V2 of the standby power supply 11 is applied from the standby power supply 11 to the load 130 via the transistor TR3. That is, the SW unit 120 switches the operation power supply 10-1 to the standby power supply 11 at the first timing determined by the determination unit 110 by causing the transistor TR1, the transistor TR2, and the transistor TR3 to cooperate.

  Further, the voltage Vout2 at the collector of the transistor TR1 changes from -21V to -48V when the time T1 elapses after the operating power supply 10-1 fails. In this case, the transistor TR1 outputs a signal of voltage Vtout = −48V to the power supply control devices 100-2 to 100-n as a signal indicating that the switching to the standby power supply 11 has been performed. For this reason, the voltage Vtin = −48V is applied to the bases of the transistors TR1 of the power supply control devices 100-2 to 100-n.

  The voltage V1 and the first voltage Vin1 of the operating power supply 10-1 become the ground voltage CG = 0V when the time T2 elapses after the operating power supply 10-1 fails. On the other hand, the diode D3 converges the second voltage Vin2 toward -17V obtained from the voltage V2 of the standby power supply 11 when the voltage V1 of the operation power supply 10-1 is not supplied. For this reason, even if the voltage of the operational power supply 10-1 is not supplied, the second voltage Vin2 does not become 0V.

  Here, it is assumed that the operation power supply 10-2 has been out of power when the time T3 has elapsed since the operation power supply 10-1 has undergone a power outage. At this time, the voltage Vtin = −48V is applied to the base of the transistor TR1 of the power supply control device 100-2. On the other hand, the voltage V2 = −48V of the standby power supply 11 is applied to the emitter of the transistor TR1 of the power supply control device 100-2. Then, the transistor TR1 of the power supply control device 100-2 switches itself to OFF, thereby setting the transistor TR2 to ON and setting the transistor TR3 to OFF. As a result, even when the second signal having the ground voltage CG is output as the output signal from the comparator of the determination unit 110, the operation power supply is supplied from the operation power supply 10-2 to the load 130 via the transistor TR2. A voltage V1 of 10-2 is applied. That is, the SW unit 120 of the power supply control device 100-2 receives the signal indicating that the switching from the other power supply control device to the standby power supply 11 is performed, from the operating power supply 10-2 to the standby power supply. Stop switching to 11.

  Next, power supply switching processing by the power supply control device 100-1 when the operating power supply 10-1 is restored will be described. As shown in FIG. 4, when the operating power supply 10-1 is restored, the voltage V1 of the operating power supply 10-1 starts to increase from 0V. Then, both the first voltage Vin1 and the second voltage Vin2 rise according to the voltage V1 of the operational power supply 10-1. However, the fluctuation speed of the second voltage Vin2 is slower than the fluctuation speed of the first voltage Vin1.

  The first voltage Vin1 rises higher than the second voltage Vin2 when time T5 has elapsed since the operation power supply 10-1 was restored. For this reason, the comparator IC1 of the determination unit 110 outputs a signal having the voltage V1 of the operational power supply 10-1 as a signal indicating the second timing. That is, when the time T5 elapses after the operation power supply 10-1 is restored, the voltage Vout1 at the output terminal of the comparator IC1 becomes the voltage V1 of the operation power supply 10-1. Then, the voltage V1 of the operating power supply 10-1 is applied to the base of the transistor TR1, and the voltage V1 of the operating power supply 10-1 is applied to the emitter of the transistor TR1. Then, the transistor TR1 switches itself to OFF, thereby setting the transistor TR2 to ON and setting the transistor TR3 to OFF. Then, voltage V1 of operating power supply 10-1 is applied from operating power supply 10-1 to load 130 via transistor TR2. That is, the determination unit 120 switches the standby power supply 11 to the operation power supply 10-1 at the second timing determined by the determination unit 110 by causing the transistor TR1, the transistor TR2, and the transistor TR3 to cooperate.

  The voltage V1 of the operating power supply 10-1 rises to −48V when time T6 has elapsed since the recovery of the operating power supply 10-1. The first voltage Vin1 rises to −24V when time T6 elapses after the operating power supply 10-1 is restored. The second voltage Vin2 rises to −22V when time T6 elapses after the operating power supply 10-1 is restored.

  As described above, the power supply control device 100 according to the present embodiment is slower than the first voltage Vin1 that varies according to the voltage V1 of the operating power supply 10 and the first voltage Vin1 that depends on the voltage V1 of the operating power supply 10. The second voltage Vin2 that changes at the changing speed is compared. Then, the power supply control device 100 switches the operation power supply 10 to the standby power supply 11 at the first timing when the first voltage Vin1 is lower than the second voltage Vin2.

  For this reason, according to the present embodiment, at the time of a power failure of the operating power supply 10, switching from the operating power supply 10 to the standby power supply 11 while suppressing the difference between the voltage V1 of the operating power supply 10 and the voltage V2 of the standby power supply 11. It can be performed. Accordingly, it is possible to suppress an inrush current from the operating power supply 10 to the standby power supply 11 that is generated due to the difference between the voltage V1 of the operating power supply 10 and the voltage V2 of the standby power supply 11. As a result, according to the present embodiment, it is possible to switch to the standby power supply 11 without causing an instantaneous interruption due to a decrease in the voltage of the operational power supply 10 when the operational power supply 10 is interrupted.

  Further, in the power supply control device 100 of the present embodiment, after the operating power supply 10 is switched to the standby power supply 11, the second voltage Vin <b> 1 rises higher than the second voltage Vin <b> 2 converged to a predetermined voltage. The standby power supply 11 is switched to the operational power supply 10 at the timing.

  For this reason, according to the present embodiment, when the voltage V1 of the operating power supply 10 increases as the operating power supply 10 is restored, the switching from the standby power supply 11 to the operating power supply 10 can be performed appropriately.

  In addition, the power supply control apparatus 100 according to the present embodiment switches the operating power supply 10 to the standby power supply 11 at the first timing when the first voltage Vin1 is lower than the second voltage Vin2, and further switches to the standby power supply 11. Is output to another power supply control device 100. Even when the first timing at which the first voltage Vin1 is lower than the second voltage Vin2 has arrived, the power supply control device 100 receives other signals indicating that the switching to the standby power supply 11 has been performed. Switching from the operating power supply 10 to the standby power supply 11 is stopped.

  For this reason, according to the present embodiment, when any one of the plurality of operation power supplies 10 is backed up by the backup power supply 11, the operation power supply 10 other than the backed-up operation power supply 10 is used as a backup. Switching to the power supply 11 can be stopped.

(Modification)
In the above embodiment, the example in which the power supply control system 1 including the power supply control apparatus 100 is connected to the base station apparatuses 20-1 to 20-n is shown, but the disclosed technique is not limited thereto. For example, as illustrated in FIG. 6, the power supply control system 1 may be provided inside the base station apparatus 20. In this case, operating power is supplied from the operation power supply 10 or the standby power supply 11 to various modules in the base station apparatus 20 via the SW unit 120 of the power supply control apparatus 100. FIG. 6 is a diagram illustrating a modification of the power supply control system.

1 power supply control system 10-1 to 10-n operation power supply 11 standby power supply 20-1 to 20-n base station apparatus 100-1 to 100-n power supply control apparatus 110 determination unit 111 first voltage dividing circuit 112 second Voltage divider circuit 120 SW part C1 Capacitor IC1 Comparator D3 Diode TR1 Transistor TR2 Transistor TR3 Transistor

Claims (6)

By comparing the first voltage that varies according to the voltage of the power supply of the operating system and the second voltage that varies at a variation rate that is slower than the variation rate of the first voltage according to the voltage, A determination unit for determining a first timing at which the first voltage is lower than the second voltage;
A power control apparatus comprising: a switching unit that switches the active power supply to a standby power supply at the first timing determined by the determination unit. The second voltage is converged to a predetermined voltage obtained from the voltage of the standby system power supply when the voltage of the operation system power supply is not supplied,
The determination unit is configured to increase the first voltage higher than the second voltage converged to the predetermined voltage after the operation unit is switched to the standby power by the switching unit. 2 timing,
The power supply control device according to claim 1, wherein the switching unit switches the standby power supply to the active power supply at the second timing determined by the determination unit. The determination unit
A first voltage dividing circuit that generates the first voltage by dividing the voltage of the power supply of the operational system;
A second voltage dividing circuit for generating a voltage lower than the first voltage by dividing the voltage of the power supply of the operational system;
A capacitor that generates the second voltage by storing a charge according to a voltage lower than the first voltage;
When the first voltage generated by the first voltage dividing circuit is compared with the second voltage generated by the capacitor, the first voltage is higher than the second voltage. A second signal indicating the first timing when the first signal is output and the first voltage is lower than the second voltage and the voltage is different from the first signal. The power supply control device according to claim 1, further comprising: a comparator that outputs The determination unit is a diode connected to the capacitor, and when the voltage of the operating system power supply is not supplied, the determination unit is directed toward the predetermined voltage obtained from the voltage of the standby system power supply. A diode for converging the voltage of
The comparator outputs the first signal indicating the second timing when the first voltage is higher than the second voltage converged to the predetermined voltage by the diode. The power supply control device according to claim 3, wherein There are a plurality of operating system power supplies, one standby system power supply, and a plurality of power supply control devices,
Each of the plurality of power supply control devices is connected in association with each of the plurality of operational power supplies and connected to one standby power supply,
The switching unit provided in an arbitrary power control device among the plurality of power control devices includes the arbitrary power control device among the plurality of active power sources at the first timing determined by the determination unit. The power supply of the active system associated with the power supply is switched to the power supply of the standby system, and a signal indicating that the switch to the standby system is performed is sent to another power supply control apparatus other than the arbitrary power supply control apparatus Output,
The switching unit provided in the other power supply control device may be a case where the first timing is determined by the determination unit when the signal is input from the arbitrary power supply control device. The power supply control device according to any one of claims 1 to 4, wherein the switching from the active power supply associated with the other power supply control device to the standby power supply is stopped. . By comparing the first voltage that varies according to the voltage of the power supply of the operating system and the second voltage that varies at a variation rate that is slower than the variation rate of the first voltage according to the voltage, A determination unit for determining a first timing at which the first voltage is lower than the second voltage;
A base station apparatus comprising: a power control apparatus comprising: a switching unit that switches the active power supply to a standby power supply at the first timing determined by the determination unit.

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