JPH02168819A - Dc power source equipment - Google Patents

Abstract

PURPOSE:To eliminate power loss by normally shortcircuiting the anode and the cathode of an anti-energy discharge diode. CONSTITUTION:Power from a primary power source is fed through an anti- reverse discharge diode 2 to a surge current limiting circuit 3 thence through an energy bank 4, a power converter 5 and a rectifying/smoothing circuit 6 to a load. Upon missing of the primary power source, counter-flow of current from the energy bank 4 is prevented by the anti-reverse discharge diode 2. An instantaneous interruption detecting circuit 13 for the primary power source 1 is provided, and the contact 11 of a relay 10 is opened only when missing of the primary power source 1 is detected thus operating the diode 2. The diode 2 is shortcircuited through the contact 11 of the relay 10, under steady state, thus eliminating loss.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a DC power supply device equipped with a diode that prevents the reverse discharge of energy from an energy bank in the event of a momentary interruption of the primary power supply. This relates to high efficiency by reducing loss caused by diodes.

[Conventional technology]

Figure 2 shows an example of a conventional DC power supply.
) is the primary power supply that supplies DC power, (2) is the primary power supply (
1) A diode to prevent energy reverse emission when there is a momentary interruption,
(3) is an inrush current limiting circuit that limits the inrush current at the moment the primary power supply (1) is turned on;
1) an energy bank that stores and releases power from;
(5) is a power conversion circuit that converts the output from the energy bank (4) into power at high frequency, and (6) is a power conversion circuit (5).
) rectifier/smoothing circuit for rectifying and smoothing the output of (
7] is the load, (8) is the rectifier/smoothing port, and m (detects the output of 61 and generates a signal to control the voltage supplied to the load (7). The control circuit (9) is an auxiliary power supply circuit for supplying power to operate the control circuit (8).

In the conventional configuration shown in FIG. 2, power supplied from a primary power source (1) is input to an inrush current limiting circuit (3) via an energy reverse emission prevention diode (2). This inrush current limiting circuit (3) is an energy bank (
This is to prevent a sudden rush current from flowing into the energy bank (4), and gradually outputs power to the energy bank (4).

The energy bank (4) supplies the accumulated energy to the power converter circuit (5) as pulsed power when the power converter circuit (5) switches, and also supplies the stored energy to the power converter circuit (5) as pulsed power.
) has the capacity to store enough energy to supply power to the load (7) for a certain period of time in the event of a momentary power outage.

The power conversion circuit (5) converts the power into step-down or step-up power to a predetermined voltage, and the rectification/smoothing circuit (6) converts the power into step-down or step-up power to a specified voltage.
) is rectified and smoothed to output DC power to the load (
7). The voltage supplied to this load (7) is detected by a control circuit (8), and a control signal is output to the power conversion circuit (5) by pulse width modulation or the like in order to stabilize the supplied voltage. Further, this control circuit (8) has additional functions such as overload/overvoltage protection functions, remote sensing, and spider-1 on/off functions.

Power for operating the control circuit (8) is supplied by an auxiliary power supply circuit (9). This auxiliary power supply circuit (9
) is operated by the power of the primary power supply (1).

The energy back emission prevention diode (2) is, for example, 1
This is to prevent the stored energy in the energy bank (4) from flowing back to the primary power source (1) when the output of the secondary power source (1) is momentarily cut off due to a short circuit, but during normal operation Since the power supplied from the primary power source (1) passes through this energy reverse emission diode (2), the power loss is large and the efficiency of the DC power supply device is greatly reduced.

[Problem to be solved by the invention]

Since the conventional DC power supply device is configured as described above, there is a problem in that during normal operation, a loss occurs due to a voltage drop in the energy reverse emission diode (2), resulting in a decrease in efficiency.

This invention was made to solve this problem, and aims to improve the efficiency of a DC power supply device.

[Means to solve the problem]

In order to improve the efficiency of the DC power supply, the DC power supply according to the present invention is equipped with a relay between the anode and cathode of the energy reverse discharge prevention diode (2). The emission prevention diode (2) is short-circuited to eliminate power loss.

[For production]

In this invention, the contact point of the relay QOI (
11), and by closing the relay contact α0) during normal operation, the energy is input to the inrush current limiting circuit (3) without going through the reverse discharge prevention diode (2), thereby reducing the loss in the energy reverse discharge prevention diode (2). When the primary power supply (1) is momentarily interrupted (momentary interruption detection circuit (
131 and opens the relay contact (11), the efficiency of the DC power supply device is improved without impairing the function of preventing the energy bank (41) from releasing energy back.

〔Example〕

FIG. 1 is a block diagram showing one embodiment of the present invention.
) to (9) are the same as or equivalent to the above conventional device,
σ0) is a relay, (Ill is a relay contact for short-circuiting both ends of the energy reverse emission prevention diode (2), (
12) A relay coil for turning ON and OFF the contacts of the beams, (13) is a momentary power failure detection circuit for detecting a momentary power failure of the primary power supply (1), and (I4) is a momentary power failure detection circuit ( I3)
is a diode that allows current to flow through the relay coil (2) in order to turn off the relay contact (11) when a momentary power cut is detected.

In the DC power supply configured as described above, during normal operation when the primary power supply (1) is turned on, the relay contact (11
) is in the ON state] The power supplied from the next power source (1) is passed through the inrush current limiting circuit (3) via the relay contact (11) without passing through the energy reverse discharge prevention diode (2). ). When the output of the primary power supply (1) is momentarily interrupted or turned OFF, the momentary interruption detection circuit (131) operates and current flows to the relay coil (+2) via the diode (14). Due to this action, The relay contact (11) instantaneously becomes 0FFt, and the energy back release prevention diode (2) prevents the back release of the stored energy in the energy bank (4) from a short-circuited state, and supplies a predetermined amount of power to the load (7) for a certain period of time. It becomes possible to

The operations (3) to (9) are similar to those of the conventional DC power supply device.

In addition, in the above embodiment, the instantaneous power failure detection circuit (13) that detects a drop in the output voltage of the primary power supply (1) instantly turns off the relay contact (river) via the diode (1D). A similar effect can be expected even if a separate power source is provided to supply current to the relay coil (2) and a drop in the output voltage of the primary power source (1) is detected and the relay contact (11) is turned off.

〔Effect of the invention〕

As explained above, the invention of O is that by providing the relay αO) with the instantaneous interruption detection circuit (0) and the diode (+4),
In a DC power supply device equipped with an energy back emission prevention diode (2), during normal operation, the power supplied from the primary power source (1) can be supplied without going through the energy back emission prevention diode (2). (2), and when the primary power supply (1) is momentarily cut off, the energy bank (4
) has the effect of increasing the efficiency of the DC power supply without impairing the function of preventing energy back-release.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a DC power supply device showing one embodiment of the present invention, and FIG. 2 is a block diagram showing one embodiment of a conventional DC power supply device. In the figure, (1) is the primary power supply, (2) is the energy reverse emission prevention diode, (3) is the inrush current limiting circuit, and (4) is the inrush current limiting circuit.
) is an energy bank, (5) is a power conversion circuit, (6)
is a rectifier/smoothing circuit, (7) is a load, (8) is a control circuit,
(9) is an auxiliary power supply circuit, αO) is a relay, (Ill is a relay contact, and (2) is a relay coil. In the drawings, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] An energy bank that stores and releases power, a primary power source that supplies power to the energy bank, a power conversion circuit that receives pulsed current from the energy bank and converts power at high frequency, and an output of the power conversion circuit. a rectifying/smoothing circuit that rectifies and smoothes the rectifying/smoothing circuit, a control circuit that detects the output of the rectifying/smoothing circuit, generates a signal to control the voltage supplied to the load, and outputs it to the power conversion circuit, and operates the control circuit. an auxiliary power supply circuit for supplying electric power; an inrush current limiting circuit for limiting inrush current from the primary power source to the energy bank; and prevention of energy reverse release installed between the primary power source and the inrush current limiting circuit. a relay that short-circuits between the anode and cathode of the diode, the energy reverse emission prevention diode, a momentary power failure detection circuit that detects a momentary power failure of the primary power source, and a current flowing through the coil of the relay by the output of the momentary power failure detection circuit. A DC power supply device characterized by being equipped with a diode that allows a current to flow.