JPS59172938A - No-break power source circuit - 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] The present invention relates to an uninterruptible circuit including a battery.

FIG. 1 shows a conventional example of this type of uninterruptible circuit. In the figure, PL and P2 are AC power input terminals, which are connected to an AC input power source (not shown).

The input AC power is rectified by a rectifying diode D1, and the DC power output from the diode is smoothed by a smoothing capacitor C1, and then taken out from DC output terminals P and N and supplied to a DC load (not shown). . BAT is a battery, and is inserted between DC output terminals P and N via a charging resistor R1 and a discharging diode D1 parallel to the charging resistor R1.

In this uninterruptible circuit, when the DC voltage vO between the DC output terminals P and N is higher than the voltage (battery voltage) VB between the terminals of the battery BAT, the battery BAT is charged through the resistor R1, and when the AC input is lost, the battery BAT is charged through the resistor R1. DC load is uninterruptedly supplied with power from battery BAT through diode DI.

However, in the conventional configuration, even when the AC input is not lost, when Vo<VB due to load fluctuation, the resistance R
1. Since the DC load current flows out from the battery BAT through the diode D1, there is a problem in that the battery BAT is not sufficiently charged.

This invention was made in view of the above-mentioned conventional problems, and involves inserting a reverse current blocking diode in series with the charging resistor of the battery, and discharging the battery via the si-risk. By adopting a configuration that conducts only during certain times, the battery can be sufficiently charged without being affected by load fluctuations, and it is possible to provide an uninterruptible circuit that can supply high-quality power even in the above-mentioned emergency. purpose.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, D3 is a rectifying diode, C2 is a smoothing capacitor, R2 and R3 are voltage dividing resistors,
It is inserted between the AC power input terminals P1 and R2 via the diode D3, and divides the voltage of the AC input and supplies it to the base of the transistor TRI via the Zener diode D4. These elements constitute a power failure detection circuit. Transistor 'rR1 is inserted between terminals of battery BAT via resistor R2. SR is a discharge control circuit inserted between the positive terminal of the battery BAT and the positive DC input terminal P, and receives a gate current through the resistor R2 when the transistor TRI is turned on. D5 is a diode for blocking backflow.

In this configuration, when the AC input voltage is lost and the voltage applied to the Zener diode D4 drops below the set value, that is, the Zener potential, the base input of the transistor TRI is cut off and the transistor is turned off. The potential of increases to the potential of anode A,
Since the potential at the cathode is lower than the potential at the anode A, Cyrisk SR is conductive. As a result, DC load power is supplied from the battery SR through the Cyrisk SR. The AC input voltage recovers and the Zener diode D
When the voltage applied to the transistor 4 rises above the set value, the transistor TRI becomes conductive and the potential of the gate G of the SIRISK becomes the ground potential, so that the SIRISK is turned off.

Even if AC input is not lost, Vo<V due to load fluctuations.
In the case of B, as long as the voltage applied to the Zener diode D4 is higher than the above set value, the thyristor SR will not conduct, and since there is a reverse current blocking diode 5, the battery B
There is no inflow of DC load power from the AT.

As described above, according to the present invention, a battery to be charged floatingly is connected to a DC output terminal via a thyristor, and a reverse current blocking diode is inserted in series with the charging resistor, and this thyristor is set to the input of the circuit. By configuring the configuration to conduct only when the voltage drops below the specified value, it is possible to prevent the battery from discharging due to load fluctuations, so it is an extremely simple configuration. It is possible to supply high-quality power to the load in emergencies such as input loss.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional uninterruptible circuit, and FIG. 2 is a circuit diagram of an embodiment of an uninterruptible circuit according to the present invention. BAT...Battery 5-SR...Sirisk TRI...Transistor R1...Charging resistor R2-R4...Resistance D1-D3, D5...Diode D4...Zener diode C1, C2 smoothing capacitors Pl, R2...input terminals P, N...output terminals In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Makoto Kuzuno - 6 - Procedural amendment (in broad daylight) Commissioner of the Patent Office 1, Indication of case Patent application No. 58246159 2,
Name of the invention: Uninterrupted Signs 3, Relationship with the person making the amendment Patent applicant address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Jinhachibe Katayama 4; Agent 5, Claims column and Detailed Description of the Invention column 6 of the specification to be amended, Contents of the amendment (1) The claims of the specification are corrected as shown in the attached sheet. (2) "Floating charge" on page 5, line 6 is corrected to "trickle charge." Claims: An uninterruptible circuit comprising a trickle-charged battery between a power input terminal and a DC output terminal, wherein the battery is connected to a discharging cyrisk, a reverse current blocking diode in parallel, and a charging resistor in series. A power failure detection circuit is provided which is inserted between the DC output terminals via a connected circuit and which detects when the voltage between the power supply input terminals has decreased below a set value, and this output turns on the Sairisk. Uninterruptible circuit.

Claims (1)

[Claims] In an uninterruptible circuit that includes a battery that is charged floating between a power input terminal and a DC output terminal, the battery is connected to the positive and negative terminals through a cyrisk and a charging resistor that is connected in parallel with this via a reverse current blocking diode. A power failure detection circuit is provided which is inserted between the DC output terminals and outputs a voltage when the voltage between the power supply input terminals is guided and the voltage drops below a set value, and the output turns on the thyristor described in item 1. uninterruptible circuit.