JPH078114B2 - Dual power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention includes two power supply devices, a regular power supply and a spare power supply,
If the regular power supply unit fails, the redundant power supply unit automatically switches to the standby power supply unit to supply power to the load, especially the duration of the output voltage uncertain state that occurs when switching the power unit can be shortened. Further, the present invention relates to a dual power supply device capable of reducing the fluctuation of the output voltage of the power supply device due to the fluctuation of the output current of the power supply device.

[Conventional technology]

In recent years, the number of electric appliances that are not allowed to stop operating is increasing, and the dual power supply device described above may be used for such electric appliances.

FIG. 3 is a block diagram of a conventional dual power supply device. In the figure, reference numeral 1 is a power supply unit body that performs a required power supply processing when an external power supply 3 is input through a power supply switch 2 and outputs an original power supply 4 and a sub power supply 5, and 6 is a power supply unit body 1 and a switch. 2 is a power supply unit. Reference numeral 7 is a feedback type voltage adjusting section for adjusting the voltage of the main power source 4 to the voltage value set in the built-in setting device 8 and outputting it, and 9 is a switch driving signal 10
The contact switch, which is driven by the switch for opening and closing the connection between the output terminal 11 of the voltage adjusting unit 7 and the device output terminal 12, enters an operating state when the auxiliary power source 5 is input, and is input in this operating state. Is a controller for outputting the switch drive signal 10 corresponding to the failure status signal 14 and the other status signal 15 and for outputting the self-status signal 16 according to the signal 10. The state signal 15 is output to the first terminal 17, and the state signal 15 is input to the control unit 13 via the second terminal 18. Reference numeral 20 is a regular power supply device including the above-mentioned respective parts including the ground terminal 19.

The failure state signal 14 is a signal obtained by detecting a failure occurring in at least one main part of the power supply device 20 by a detection means (not shown), and becomes H level when the failure occurs and L level when the failure does not occur. Is a binary signal. In addition, the signals 10, 15 and 16 are all binary signals having an H level state and an L level state, and the control unit 13 is at the L level when the signal 15 is at the L level in the operating state. When the signal 14 is input, the H level signal 10 is output and the H level signal 16 is output. When the signal 15 is at the L level and the signal 14 is at the H level, both the signals 10 and 16 are set to the L level. Configured to go high, and signal 15 goes high.
Signal 10,1 regardless of the value of signal 14 at level
Both 6 are set to L level. Then, in this case, the switch 9 is configured to perform the circuit opening operation when the signal 10 is at the L level and the circuit closing operation when the signal 10 is at the H level.

Reference numeral 20a denotes a backup power supply device having the same configuration as the regular power supply device 20. In FIG. 3, the device output terminal 12 and the device output terminal 12a of the power supply device 20a corresponding to the terminal are connected to each other. The terminals 12 and 12a are connected to one end of the load 12, and the other end of the load 21 is connected to the ground terminal 19 and the ground terminal 19a of the power supply device 20a corresponding to the ground terminal 19. Then, both power supply devices 20 and 20a further receive the self-state signal 16 output from the power supply device 20 via the terminal 17.
is inputted to the a as the other state signal 15a via the terminal 18a,
The self-state signal 16a output from the power supply device 20a via the terminal 17a is connected to the power supply device 20 via the terminal 18 as the other state signal 15. 22 is the load
This is a redundant power supply device consisting of the parts shown in the figure except 21.

Since the power supply device 22 is configured as described above, the switch 2 is first turned on while the switches 2 and 2a are off. Then, since the power supplies 6 and 4 output the power supplies 4, the voltage of the output terminal 11 becomes the set value S by the setter 8 and the control unit 13 is in the operating state. At this time, the power supply device 20 fails. If not, the signal 14 is at the L level, and the signal 15 is also at the L level at this time.
0 and 16 become H level. Therefore, the power source 4
Is applied via the adjusting section 7 and the switch 9, and in this case, the power source section 6 caused by the current I flowing through the load 21 is applied.
The voltage drop based on the impedance of V fluctuates with the fluctuation of the current I, and therefore the voltage V applied to the load 21 tends to change. However, since the voltage adjusting unit 7 operates as described above, the voltage V changes the current I. Even if it is, the predetermined value S is maintained.
Then, when the switch 2a is turned on after the switch 2 is turned on, the H-level signal 1 has already been sent to the control unit 13a at this time.
Since 5a is input, the power supply device 20a waits in a state in which a voltage equal to the installation value Sa set by the setter 8a is output to the output terminal 11a of the adjustment unit 7a. In this case, S = Sa for the setters 8 and 8a
Is set to.

When the power supply device 20 fails and the signal 14 becomes H level when the power supply device 22 is in the above-described operating state, the signal 15 is at L level at this time, the signals 10 and 16 become L level, and the switch 9 is turned on. As a result, the control unit 13a outputs H-level signals 10a and 16a, so that the switch 9a is turned on, and the power source 20a supplies the source power 4a to the load 21.

[Problems to be Solved by the Present Invention]

Since the power supply device 22 is configured as described above, when the device 20 fails while the power supply device 20 is operating and the power supply device 20a is on standby, the output of the device 20 is disconnected from the load 21. Power is supplied to the load from the device 20a,
In this state, when the failure in the device 20 is recovered and the signal 14 becomes L level, the device 20 enters the standby state, and when a failure occurs in the device 20a in this state, the load 21 is supplied with power from the device 20. become. Therefore, it is possible to form a highly reliable electric device by using such a power supply device 22, but in the case of FIG. 3, the switches 9 and 9a are contact switches, and these switches perform mechanical operation. Both have an operating time of about 1 [ms]. Therefore, when switching between the two power supply devices 20 and 20a, the output voltage V is about 1 [ms] as shown in FIG. Time T occurs.
Thus, this time T is a non-negligible time that causes an operation interruption for electronic devices that are frequently used recently. Therefore, the above-described power supply device 22 has a problem that the output indefinite time T that cannot be ignored occurs when the devices 22 and 20a are switched.

Therefore, in the power supply device 22, it is possible to obtain a dual power supply device having a short time T by converting the switches 9 and 9a into analog switches having a short operating time.
Has a slight contact resistance of about 0.1 (Ω), the analog switch usually has a circuit resistance of several hundred (Ω), so in this case, the voltage drop in the analog switch becomes large, There is a problem that the fluctuation of the voltage V due to the fluctuation of the current I exceeds the allowable fluctuation value of the voltage.

It is an object of the invention to use an analog switch, which has the disadvantage of high circuit resistance but has the advantage of a fast operating time, for switching between a regular power supply and a spare power supply. However, by adopting a circuit configuration in which the voltage drop variation due to the load current in the switch does not appear at the power supply device output terminal, the duration of the output voltage indefinite state generated at the time of switching between the two power supply devices is shortened. And to reduce fluctuations in the output voltage of the power supply device.

[Means for solving problems]

In order to solve the above problems, according to the present invention, a power supply unit that outputs a main power supply, a feedback type voltage adjustment unit that adjusts the voltage of the main power supply to a predetermined value and outputs the input voltage are input. A controller that outputs one of a first drive signal and a second drive signal in accordance with each signal form of the failure state signal and the other state signal, and outputs a self-state signal in accordance with these both output signals; A first switch that opens and closes a connection between an output terminal of the voltage adjustment unit and a device output terminal; a second switch that opens and closes a connection between a feedback terminal of the voltage adjustment unit and the device output terminal; A state in which two power supply devices each having a third switch that opens and closes a connection between the output terminal of the voltage adjustment unit and the feedback terminal are provided, and the device output terminals provided in each of the power supply devices are connected to each other. Via the device output terminal For supplying electric power to a load, wherein the two power supply devices are arranged such that the self-status signal output from one of the power supply devices is input to the other power supply device and the self-status signal is supplied to the other power supply device. The third switch is connected so as to be the other state signal, and the third switch performs a circuit opening operation when the first drive signal is input and a circuit closing operation when the second drive signal is input. In addition, the first switch and the second switch both operate in the opposite manner to the third switch in response to the first drive signal or the second drive signal input to the dual switch power supply device. Shall be configured.

[Action]

With the above configuration, the voltage appearing at the output terminal of the device is maintained at a predetermined value by the action of the feedback voltage regulator even if the first switch is an analog switch having a large power drop due to the current flowing through the load. Therefore, it is possible to obtain the dual power supply device in which the fluctuation of the output voltage is small. In this case, the first
If the third switch is an analog switch or the like having a high operating speed, the speed of switching from one power supply device to the other power supply device becomes faster, and as a result, the duration of the output voltage indefinite state generated at the time of switching between the two power supply devices is reduced. A short duplex power supply is obtained.

〔Example〕

FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, a big difference from FIG. 3 is that the switch 9 is replaced by a first switch 23, a second switch 24 and a third switch 25, and the switch 9a is replaced by a switch 23a, 24a and 25a. In this case, the switches are
All have large circuit resistance of several hundred [Ω], but operating speed is 1
It is composed of an extremely fast analog switch of about [μs] and is driven by the corresponding drive signals 10 and 10a. Then, the switch 23 operates as the voltage adjusting unit 7.
Open and close the connection between the output terminal 11 and the device output terminal 12,
The switch 24 is a feedback terminal 26 of the voltage regulator 17 and a device output terminal.
Open and close the connection between 12 and switch 25 is the output terminal
The switch 11 is connected so as to open and close the connection between the feedback terminal 26 and the feedback terminal 26, and the switch 25 is opened when the drive signal 10 is at L level and is opened when the signal 10 is at H level. And switches 23 and 24 are set to signal 10
The switch 25 is configured to operate in the opposite manner for each level of. The switches 23a, 24a, 25a are configured to have the same function as the corresponding switch of the switches 23 to 25. Reference numeral 27 is a regular power supply device provided with the switches 23 to 25, 27a is a backup power supply device provided with the switches 23a to 25a, and 28 is a redundant power supply device including the respective parts shown in the figure except the load 21.

Since FIG. 1 is configured as described above, if the power switch 2 is first turned on and the switch 2a is left off, the control unit 13 becomes the operating state and the control unit 13a does not become the operating state. On the other hand, if the status signal 15 is at L level and the failure status signal 14 is at L level at this time, the control unit 13
Outputs H level signals 10 and 16. Therefore, since the switches 23 and 24 are closed and the switch 25 is opened, the voltage of the device output terminal 12 is fed back to the feedback terminal 26 of the adjusting section 7 via the switch 24. Since the flowing current is zero, no voltage drop occurs in the switch 24. As a result, the voltage at the terminal 12, that is, the output voltage V of the dual power supply device 28 is set regardless of the resistance of the switches 23 and 24 and the load current I. Set voltage S set by the unit 8
Is equal to

If the power switch 2 is turned on and then the switch 2a is turned on, the control unit 13a is in the operating state. However, since the control unit 13a receives the H-level state signal 15a at this time, the control unit 13a L regardless of the level of signal 14a
Outputs level signals 10a and 16a, and switches 23a and 24a
Is opened and the switch 25a is closed. Therefore, if no failure has occurred in the power supply device 27a and the failure status signal 14a is at the L level, the output 1 of the voltage adjustment unit 7a
Since the voltage of 1a becomes equal to the voltage 8a set by the setter 8a, the power supply device 27a is in a standby state in which the voltage Sa can be output forever by turning on the switch 2a. As previously mentioned
Sa is a voltage equal to S.

When the power supply device 27 outputs the voltage S and the power supply device 27a is in the standby state and the device 27 fails and the signal 14a becomes H level, the signals 10 and 16 become L level.
The switch drive signal 10a output by
Switches 23 and 24 open, switch 25 closed, switches 23a and 24a
Is closed and the switch 25a is opened. As a result, the load 21 is supplied with the voltage V having the value Sa = S from the power supply 27a,
The power supply device 27 enters the standby state as described above. Then, when switching between the power supply devices 27 and 27a,
The voltage V applied to the load 21 has a temporal pattern as shown in FIG. 2, for example. FIG. 2 shows an example of an experimental result by the present inventor. As can be seen from FIG. 2, in the dual power supply device 28, since the switches 23 to 25 and 23a to 25a are all analog switches having the above-mentioned operating speed, the output voltage indefinite time T when the power supply device is switched is 1 [μ
s], which is an extremely short time. Therefore, if such a power supply device 28 is adopted as an electronic device that does not like a momentary power interruption, a highly reliable electronic device can be obtained.

Although the switches 23 to 25 and 23a to 25a are configured by analog switches in the above-mentioned embodiment, the present invention may employ other switches having a high operating speed instead of such analog switches. It is clear from the above. Further, in the above embodiment, the power supply devices 27 and 27a are supplied from the external power supplies 3 and 3a, respectively. However, in the present invention, the power supplies 3 and 3a may be the same power supply.

〔effect〕

As described above, in the present invention, the power source unit for outputting the original power source, the feedback type voltage adjusting unit for adjusting the voltage of the original power source to a predetermined value and outputting the voltage, the fault status signal and the other A control unit that outputs one of a first drive signal and a second drive signal in accordance with each signal form of the state signal and outputs a self-state signal in accordance with both output signals;
A first switch that opens and closes the connection between the output terminal of the voltage adjustment unit and the device output terminal; a second switch that opens and closes the connection between the feedback terminal of the voltage adjustment unit and the device output terminal; Third for opening and closing the connection between the output terminal and the feedback terminal
Two power supply devices each having a switch are provided, and power is supplied to a load through the device output terminals in a state where the device output terminals respectively provided on the both power supply devices are connected to each other. The devices are connected to each other so that the self-state signal output from one power supply device becomes the other state signal input to the other power supply device, and the third switch opens the circuit when the first drive signal is input. Second
When the drive signal is input, the circuit closes, and the first switch and the second switch both operate in reverse to the third switch according to the first drive signal or the second drive signal input to each. Thus, the dual power supply device was constructed.

Therefore, with the above configuration, even if the first switch is an analog switch having a large voltage drop variation due to the current flowing through the load, the voltage appearing at the device output terminal is maintained at a predetermined value by the action of the feedback voltage regulator. Therefore, the present invention has the effect of providing a dual power supply device in which the fluctuation of the output voltage is small. Further, in this case, if the first to third switches are analog switches having a high operating speed, etc., the speed of switching from one power supply device to the other power supply device becomes faster, and as a result, the present invention provides a method for switching between both power supply devices. There is an effect that a dual power supply device in which the output voltage indefinite state occurring at the time of switching is short in duration is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is an explanatory diagram of experimental results relating to the embodiment of FIG. 1, FIG. 3 is a block diagram of a conventional dual power supply device, and FIG. It is operation | movement explanatory drawing of the conventional apparatus shown in the figure. 3,3a …… External power supply, 4,4a …… Main power supply, 7,7a …… Voltage control unit, 10,10a …… Switch drive signal, 11,11a …… Output terminal, 12,12a …… Device output terminal , 13,13a …… Control unit, 14,1
4a …… Fault status signal, 15,15a …… Other status signal, 16,16a
...... Self-status signal, 20,20a, 27,27a …… Power supply, 21…
… Load, 22, 28 …… Dual power supply, 23, 23a …… 1st switch, 24, 24a …… 2nd switch, 25, 25a …… 3rd switch, 26, 26a …… Feedback terminal.

Claims (1)

[Claims] 1. A power supply unit for outputting an original power supply, a feedback type voltage adjusting unit for adjusting and outputting the voltage of the original power supply to a predetermined value, and a failure status signal and another status signal to be input. A control unit for outputting either one of the first drive signal and the second drive signal according to the signal mode and for outputting a self-state signal according to the both output signals, an output terminal of the voltage adjustment unit, and a device output. A first switch that opens and closes a connection with a terminal, a second switch that opens and closes a connection between a feedback terminal of the voltage adjustment unit and the device output terminal, an output terminal of the voltage adjustment unit and the feedback terminal Two power supply devices each having a third switch for opening and closing the connection between the power supply device and the power supply device are provided, and the device output terminals respectively provided to the two power supply devices are connected to each other to load through the device output terminals. To supply electricity The two power supply devices are connected so that the self-state signal output from the one power supply device becomes the other state signal input to the other power supply device, and the third switch is connected to the third switch. When the first drive signal is input, the circuit is opened, when the second drive signal is input, the circuit is closed, and the first switch and the second switch are input to the first drive. A dual power supply device, which operates opposite to the third switch in response to a signal or the second drive signal.