JPH0549177A - Battery voltage checking system - Google Patents

Abstract

PURPOSE:To obviate the necessity of voltage detecting circuit for each battery and to reduce the number of control lines between the battery and a power supply control unit in battery voltage check system for power supply system. CONSTITUTION:Means 2 for detecting the output current from a rectifier 1, when the output voltage from the rectifier 1 drops below the output voltage from a battery unit 5, is incorporated in the rectifier 1 while means 16 for receiving an overcurrent signal from the current detecting means 2 and a signal for turning the battery unit 5 OFF to make a decision of abnormality is incorporated in a power supply control unit 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery voltage check system in a power supply system. In a device that requires n batteries, it is necessary to detect the abnormal voltage of the battery even when redundant with at least (n + 1) batteries.

[0002]

2. Description of the Related Art As a conventional battery voltage check system, there is a system shown in FIG. 3, for example. In FIG. 3, reference numeral 1 denotes a rectifying device (hereinafter, P
DU), 3 is a converter (hereinafter, CONV), 4 is a load, and 5A is (n + 1) pieces, and is a battery device (hereinafter, BTU) for redundancy.

The BTU 5A is an interface control unit (hereinafter referred to as ICU) 10A, relays 8 and 9, diodes 6, and so on.
7, battery 11, resistors 17 and 18, reference power source 19
And a voltage detection circuit 21 including a comparator 20. 12A is a power control unit (hereinafter, PCU) PD
While receiving OC signal (overcurrent signal) from U1, B
Receives BUVA0 to BUVA (n + 1) signals (abnormality detection signals) from TU5A, and also * PON0 to BTU5A.
* TST0 to * for the flip-flop 14A and the BTU5A that provide the * PON (n + 1) signal (ON / OFF signal)
It has a flip-flop 13A which gives a TST (n + 1) signal (test signal).

The PDU 1 receiving the AC power supply outputs the output voltage V
Output o. The CONV 3 receiving Vo converts the voltage into a necessary low voltage and supplies power to the load 4. On the other hand, the (n + 1) BTUs 5A that have received the output voltage Vo of the PDU 1 are in a charging state through the relay 8. At this time, the opening and closing of the relays 8 and 9 are controlled by the * PON signal from the PCU 12A, and when the instruction of the PCU 12A is received, the relays 8 and 9 are closed. At this time, PDU
The relationship between the output voltage Vo of 1 and the output voltage VB of the battery 11 is Vo ≧ VB, and as long as Vo is output from the PDU 1, VB from the BTU 5A is not output.

In this state, when checking the voltage of BTU5A, the corresponding BTU5A from PCU12A is checked.
* TST signal was sent to the BT that received the signal
U5A opens relay 8 and relay 9. As a result, in the voltage detection circuit 21 in the BTU 5A, the voltage VB of the battery 11 divided by the resistors 17 and 18 is compared with the reference voltage Vf, and if it is lower than the reference voltage Vf, the interface with the PCU 12A is controlled. IC
The BUVA signal was sent to the PCU 12A via the U10A, and the BTU 5A in which the abnormality occurred in the PCU 12A was detected.

[0006]

However, in such a conventional battery voltage check system, the BT
It is necessary to open the relay when checking the voltage of U. This is because in order to check the output of the BTU, it is necessary to stop charging and not take a load, so the PCU sends the * TST signal to release it and the BUVA in that state. I was watching the signal.

However, in the PCU, when checking the voltage of the BTU, it is necessary to send out the * TST signal and monitor only the BUVA signal, which complicates the control in the PCU and increases the control lines of the PCU and the BTU. In addition, a voltage detection circuit is required for each BTU, which is a factor that reduces the reliability of the BTU. The present invention has been made in view of such conventional problems, and a battery that does not include a voltage detection circuit for each battery and that can reduce the number of control lines in the battery and the power supply control unit The purpose is to provide a voltage check method of.

[0008]

FIG. 1 illustrates the principle of the present invention. In FIG. 1, 1 is a rectifier that converts an AC input into DC and outputs the same, 3 is a converter that receives the output of the rectifier 1 and supplies a low voltage to a load 4, and 5 is a backup when the AC input fails. (N + m) redundant battery devices, 12 is a power supply control unit for controlling these devices, and 2 is a rectifier device 1 when the output voltage of the rectifier device 1 is lower than the output voltage of the battery device 5. Is a current detecting means for detecting the output current of the above, and 16 is a judging means for judging an abnormality by inputting an overcurrent signal from the current detecting means 2 and a signal for turning off the battery device 5.

[0009]

In the present invention, the output voltage of the redundant m battery units is turned off, and the output voltage of the rectifier at that time is lowered below the output voltage of the battery unit, and at the same time, the output current of the rectifier is detected. By means of the means, when a current exceeding a certain standard does not flow, it is detected that the output voltage of the battery device turned off at that time is abnormal.

Thus, an abnormal battery device can be detected without providing a voltage detection circuit for each battery device, and the number of control lines between the power supply control unit and the battery device can be reduced. The control by the power supply control unit can be simplified.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing an embodiment of the present invention. In FIG. 2, reference numeral 1 is a rectifier (hereinafter referred to as PDU) to which AC is input, and PDU 1 outputs a DC high voltage. The PDU 1 is provided with a current detection circuit 2 as a current detection means. The current detection circuit 2 receives an * TST signal (test signal) and receives an OC signal (overcurrent signal) when a current of a certain reference level or more flows. ) Is output.

Reference numeral 3 is a converter (hereinafter referred to as CONV) to which the output of the PDU 1 is input, and CONV 3 supplies a low voltage to the load 4. 5 is a battery device (hereinafter referred to as BTU) that backs up when the AC input is interrupted,
If BTU5 can be backed up with n, for example,
It is made up of (n + 1) pieces and performs redundancy.

BTU 5 includes diodes 6, 7, relays 8,
9, an interface control unit (ICU) 10 for controlling opening / closing of the relays 8 and 9, and a battery 11. BT
The * PON0 to * PON (n + 1) signals (on / off signals) are input to U5. Reference numeral 12 is a power supply control unit (hereinafter, PCU) that controls the PDU 1 and the BTU 5.
The PCU 12 supplies the * TST signal to the PDU1 and the flip-flop 13 and BTU5 to * PON0 to * PON (n +
1) Flip-flop 14 that gives a signal, inverter 15 that inverts the output of flip-flop 14, and AND circuit 16 that takes the AND of the output of inverter 15 and the OC signal
have.

The AND circuit 16 has a function as a discrimination means for discriminating an abnormality, and has a function of BUVA0 to BUVA (n +).
1) Output a signal (abnormality determination signal). Next, the operation will be described. The PCU 12 validates the * PON signal of the BTU 5 to be checked, and at the same time, sends the * TST signal to the PDU 1 to notify that the battery voltage is being checked. Since BTU5 is redundant, one BTU5
CONV3 can operate even when is off.
At this time, the PDU1 lowers the output voltage from the VB of the battery 11 (however, CONV3 is an operable voltage) and monitors the increase in the output current, except for the BTU5 which validates the * PON signal from the PCU12. If all are normal, there is no power supply from PDU1, but if one of them has an abnormal voltage, n units of BTU5
In this case, the power is not supplied in time and the power is supplied from PDU1, so that the output current of PDU1 increases.

The PDU 1 sends an OC signal to the PCU 12 when an output current above a certain standard flows while receiving the * TST signal. The current detection circuit 2 is also used as a normal current detection circuit, and is set to a detection reference lower than the normal detection reference by the * TST signal to distinguish from the normal overcurrent detection. On the other hand, in PCU12 which received the OC signal, * PO
AND with BTU5 * PON signal that enabled N signal
Take logic. As a result, only when the * PON signal of the abnormal BTU 5 is validated, the other BTUs 5 are normal, so that the current increase in the PDU 1 does not occur and the OC signal is not transmitted. Therefore, by taking the AND logic of the OC signal and the inverted signal of the * PON signal, the abnormal BT
U5 can be detected.

As described above, an abnormal BTU5 can be detected without providing a voltage detection circuit for each BTU5, and the number of control lines between the PCU12 and the BTU5 can be reduced. Can be simplified. Also, in a system that requires n BTU5 units and (n + 2) units are redundant, two B units are used.
When an abnormality occurs in TU5, one BT each
Even if the U5 is instructed to validate the * PON signal, the OC signal from the PDU1 is always transmitted, and the abnormal BTU5 cannot be detected. Therefore, in the PCU 12, even if the BTU 5 is instructed to enable the * PON signal one by one, the PDU 1
2 if the OC signal from
If you turn off the BTU5 of each unit and perform the same check,
When the valid instruction of the * PON signal is sent to the two BTUs 5 having an abnormality, the OC signal from the PDU 1 is not transmitted, and thus the abnormal BTU 5 can be detected.

Similarly, it is needless to say that the BTUs 5 corresponding to the number of redundant units can be detected by the OFF instruction for the number of redundant units.

[0018]

As described above, according to the present invention, it is possible to detect an abnormal battery without providing a voltage detection circuit for each battery, and control between the rectifying device and the battery device. The number of lines can be reduced, and the control by the power supply control unit can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the principle of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing a conventional example.

[Explanation of symbols]

 1: Rectifier (PDU) 2: Current detection circuit (current detection means) 3: Converter (CONV) 4: Load 5: Battery device (BTU) 6, 7: Diode 8, 9: Relay 10: Interface control unit (ICU) ) 11: battery 12: power supply control unit (PCU) 13, 14: flip-flop 15: inverter 16: AND circuit (discriminating means)

Claims (1)

[Claims] A rectifier (1) for converting an AC input into a DC and outputting the same, a converter (3) for receiving an output of the rectifier (1) and supplying a low voltage to a load (4), and an AC In a power supply system comprising a battery device (5) for performing (n + m) redundancy for backup when an input power failure occurs, and a power supply control unit (12) for controlling these devices, the rectifying device (1) Current detecting means (2) for detecting the output current of the rectifying device (1) when the output voltage of the rectifying device is lower than the output voltage of the battery device (5).
The power supply control unit (12) is provided with a judging means (16) which is provided in the inside and which judges an abnormality by inputting an overcurrent signal from the current detecting means (2) and a signal for turning off the battery device (5). A battery voltage check system characterized by detecting an abnormality when the battery is backed up by n battery devices (5) and is redundant in (n + m) devices.