JPH0398431A - Battery-backup type uninterruptible power supply - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] This invention relates to an uninterruptible power supply device used in electronic equipment such as computers to ensure uninterrupted operation. In particular, with regard to battery backup type uninterruptible power supplies, in order to simplify the circuit structure, a backup winding is provided in the transformer of the voltage conversion mechanism, and the battery charging circuit and battery are connected in series to this backup winding. At the same time, a switching circuit is installed in parallel with the charging circuit.8 During normal times, the pulse voltage obtained from the backup winding is supplied to the charging circuit to charge the battery. In the event of a power outage, power is supplied from the battery to the switching circuit and the backup winding is controlled to switch. We took precautions to maintain the functionality of the voltage conversion mechanism. [Industrial Application Field] The present invention relates to an uninterruptible power supply device used in electronic equipment such as computers to ensure uninterrupted operation. Especially regarding battery backup type uninterruptible power supplies. [Conventional technology] In computers. If a power outage occurs during operation and the power supply voltage drops, not only will processing become impossible, but the data being processed will be destroyed and cannot be recovered. Additionally, problems arise, such as recovery requiring a lot of effort and time. Therefore, in relatively large-scale computers or computers that perform particularly important processing. Some form of power outage countermeasures are provided, such as the use of uninterruptible power supplies. Battery backup type uninterruptible power supply. One such method has recently come into use in small computers. In Figure 3. This figure shows the general rules of a typical conventional battery backup type uninterruptible power supply.

In Figure 3, 1 is an input commercial AC power supply, 2 is a rectifier,
3 is a smoothing capacitor, 4 is a transformer. 4a is the primary S line,
4b and 4c are secondary S lines. 5 is a switching transistor. 6 is a control circuit, 7 and 8 are rectifier diodes, 9 and 10 are flywheel diodes, 11
12 is a choke coil, 13 and l4 are smoothing capacitors, 15 is a battery 9, 16 is a charging circuit, 17
is a booster circuit.

First, normal operation will be explained. The voltage of the input commercial AC power supply 1 is, for example, an AC voltage of 100 to 120V, and this AC voltage is rectified by a rectifier 2. The voltage is smoothed by the smoothing capacitor 3 to become a DC voltage of approximately 130 to 150V, which is applied to the primary winding 4a of the transformer 4. A switching transistor 5 is connected in series to the primary winding tlA4a. This switching transistor 5
teeth. It is turned on/off by a drive pulse applied to the head from the control circuit 6. Switches the current flowing through the primary winding 4a. The control circuit 6 is. To control the output DC voltage at constant voltage. Monitor the output DC voltage level,
Depending on the level of the drive pulse, for example PWM
It has a modulating function. They are omitted in the figure for simplicity. Pulse voltages induced in the secondary windings 14b and 4c by switching the primary winding m914a of the transformer 4 are rectified by diodes 7.8, respectively. It is smoothed by choke coils 11 and 12 and smoothing capacitors 13 and 14. It is output as a DC voltage. Meanwhile, during this period, the charging circuit l6 is charging the battery l5 using the voltage of the input commercial AC power supply 1 as input. How to charge. There are constant current charging and pulse charging. Additionally, an overcharging prevention mechanism is added as necessary. Note that the voltage of the battery 15 is often considerably lower than the voltage of the input commercial AC power supply 1. Therefore, the charging circuit l6 includes a step-down circuit that absorbs the voltage difference between them. Next, the operation when a power outage occurs will be explained.

When a power outage occurs, the voltage of input commercial AC power supply 1 becomes zero, and the voltage of Hanoteri-15 is supplied to booster circuit 17 instead. The voltage boosted here is applied to the output side of the rectifier 2. This boosted voltage is approximately comparable to the voltage output from the rectifier 2 during normal times, for example. Boost circuit l
7 is controlled by, for example, a DC-DC converter.

In this way, the voltage supplied from the battery 15 instead of the input commercial AC power supply 1 is . Primary winding 4 of transformer 4
applied to a. Switching is performed in the same way as in normal times, and the DC voltage resulting from voltage conversion is output.

[Problem to be solved by the invention]

In the conventional battery banokup type uninterruptible power supply jQ device. Because the backup battery is installed on the primary side of the transformer. The battery voltage is considerably lower than the rectified output voltage level of the commercial AC voltage. It has become. When charging a battery, the voltage is stepped down from the rectified output voltage level of the commercial AC voltage to the battery voltage. When supplying power from a battery, it was necessary to boost the battery voltage to the rectified output voltage level of the commercial AC voltage.

Because of this, the circuit around the battery is complicated. There was a problem that the amount of hardware increased.

An object of the present invention is to simplify the circuit structure of a vanteri backup type uninterruptible power supply.

(Means for Solving Problem i) The present invention provides: In order to eliminate the need for step-down or step-up when charging a backup battery and supplying power from the battery, a backup-only winding with an appropriate winding voltage is provided in the transformer. is provided, and the battery is charged and power is supplied from the battery via this winding.

FIG. 1 is a diagram showing the basic structure of the present invention.

In Figure 1. 1 is a human-powered commercial AC power supply, and 2 is a rectifier.
3 is a smoothing capacitor. 4 is a transformer, 4a is a primary winding,
4b and 4c are secondary windings, 4d is a backup winding, 5 is a switching transistor, 6 is a control circuit, 1 to 10 are diodes, and 11 and 12 are choke coils. 13 and l4 are smoothing capacitors, 18 is a battery, 19 is a charging circuit, 20 is a switching transistor, and 21 is a control circuit.

The operation of the apparatus of FIG. 1 is as follows.

During normal operation, the AC voltage of the input commercial AC power rA1 is the rectifier 2.
The DC voltage is rectified by the DC voltage, smoothed by the smoothing capacitor 3, and applied to the primary winding 4a of the transformer 40.

The switching transistor 5 is . Switching is driven by the control circuit 6. Turns on/off the current flowing through the primary winding 4a. As a result, the secondary windings 4b and 4c of the transformer 4
A pulse voltage is induced in the backup winding 4d.

The pulse voltage induced in the secondary winding 4b is . diode 7
The choke coil 11. Smoothing capacitor 13
The voltage is smoothed, converted to a DC voltage, and output. Similarly, the pulse voltage induced in the secondary winding 4C is . It is rectified by diode 8. The voltage is smoothed by the choke coil l2 and the smoothing capacitor 14, converted into a DC voltage, and output.

On the other hand, the pulse voltage induced in the bank-up winding 4d is . The battery l8 is charged via the charging circuit 19.

Note that at this time, the switching transistor 20 is controlled to be in an off state.

When a power outage occurs. The switching drive of the primary winding 4a of the transformer 4 is stopped. Instead, the control circuit 2l is activated and the switching transistor 20 is turned on/off. As a result, the current supplied from the battery l8 is switched and sent to the backup winding 4d. Transformer 4 is driven. That is, in the event of a power outage, the bank amplifier winding 4d becomes the primary winding, and energy is supplied from the battery 18.

[For production]

According to the horizontal precepts of the present invention shown in FIG. 1, a pulse voltage optimal for charging the battery 18 is induced in the vanok-up winding of the transformer 4, so a large step-down is not required. and, as a result, when used as a drive winding during a power outage. To eliminate the need to specifically boost battery voltage.

[Example] See Figure 2. The circuit structure of a device according to an embodiment of the present invention is shown below. The illustrated embodiment has a circuit structure that is simply shown in FIG. 1 as the principle structure of the present invention. This figure shows a more specific circuit section that is the main part of the present invention. Therefore, circuit elements in Figure 2 that are unchanged from those in Figure 1 are given the same reference numbers, and their contents are basically the same as those explained in Figure 1, so any changes will be described here. The explanation will focus on the circuit elements.

In Figure 2, 22 is a voltage control circuit. 23 is a diode for blocking backflow. These are the charging circuit 19 in Figure 1.
corresponds to

In the voltage control circuit 22. When the switching transistor 5 is on, a pulse is applied to the bank-up winding 4d. At this time, the voltage control circuit 22 outputs a pulse with a constant voltage slightly lower than the voltage of the applied pulse. Constant voltage pulse charging is performed via the diode 23. Also in Figure 2. 25 is a voltage detection circuit, 26 is a PWM modulation circuit, 27 is a changeover switch, and 28 is a power failure detection circuit. these are. The two circuit functions of the control circuit 6 and the control circuit 21 shown in FIG. 1 are realized.

The lightning outage detection circuit 28 monitors the voltage of the input commercial AC power a1. Under normal conditions, the selector switch 27 is held on the a side. When a power outage is detected, the selector switch 27 is switched to the b side.

As a result, the PWM modulation circuit 26. A switching drive pulse whose pulse width is modulated according to the voltage detected by the voltage detection circuit 25 is generated to drive the base of the switching transistor 5 during normal times, and to drive the base of the switching transistor 20 during a power outage. In this way, the transformer 4 is normally driven by the primary winding 4a. Also, in case of power outage, Bank Anopu Ichisen 4D
Driven by. Uninterruptible operation is performed.

〔Effect of the invention〕

This is because the battery backup type uninterruptible power supply according to the present invention uses a dedicated bank-up winding that matches the battery voltage. The voltage of the supply source for charging the battery can be set to a value close to the battery voltage. Additionally, since the transformer can be directly driven by the Vantel voltage, there is no need for a step-down circuit or step-up circuit. It is possible to reduce the amount of hardware in the device and reduce costs.

[Brief explanation of drawings]

Figure 1 shows the basic structure of the present invention. Figure 2 is a configuration diagram of an apparatus according to one embodiment of the present invention. Figure 3 shows the configuration of a conventional device. In Figure 1. 1: Input commercial AC power supply 2: Rectifier 3.13, 14: Smoothing capacitor 4: Transformer 4a: Primary winding 4b, 4c: Secondary winding 4d: Backup winding 5.207 Switching transistor 6, 21: Control Circuits 7 to 10: Diode l8: Battery l9: Charging circuit

Claims (1)

[Claims] Rectifying and smoothing the input commercial AC voltage, switching the obtained DC voltage to drive the primary winding of the transformer, and transforming the secondary winding of the transformer to a desired level. It is equipped with a voltage conversion mechanism that extracts the pulsed voltage, rectifies and smoothes it, converts it to DC voltage, and outputs it.Furthermore, a backup winding is provided in the transformer of the voltage conversion mechanism, and a battery is charged in this backup winding. The circuit and the battery are connected in cascade, and a switching circuit is provided in parallel with the charging circuit. During normal times, the pulse voltage obtained from the backup winding is supplied to the charging circuit to charge the battery, and during a power outage, the battery is charged. A battery backup type uninterruptible power supply device, characterized in that the battery backup type uninterruptible power supply device is characterized in that the function of the voltage conversion mechanism is maintained by controlling the backup winding to be switched and driven by supplying power to the switching circuit from the above.