KR200421607Y1 - Switching mode power supply equipped with auxiliary battery and charger for this battery - Google Patents

Abstract

The present invention relates to a power supply device having an auxiliary power supply means and a charging means, and more particularly, to supply a voltage having a constant size without noise to the load, and provided with an auxiliary power supply in case of power failure, It relates to a power supply having a charging means for charging the power.

The power supply of the present invention is mainly used for fire fighting equipment,

A first filter for filtering noise of an AC input voltage, a first smoothing part for rectifying and smoothing the voltage filtered through the first filter part, and switching a smoothed voltage through the first smoothing part based on a feedback signal A first switching control unit for transmitting to a transformer, a load power supply unit rectifying and supplying a voltage output from the first transformer to a load, and outputting a feedback signal to the first switching control unit by detecting an output voltage of the load power supply unit. Power supply means comprising a feedback unit; And,

A second filter unit filtering the noise of an AC input voltage, a second smoothing unit rectifying and smoothing the voltage filtered through the second filter unit, and switching the voltage smoothed through the second smoothing unit based on a feedback signal to switch the second A second switching controller for transmitting a transformer, a charging power supply for rectifying and smoothing a voltage output by the second transformer, and supplying a charging current, and detecting an output voltage and a current of the charging power supply and transmitting a feedback signal to the second switching controller. Charging means comprising a second feedback portion for outputting: And,

And a secondary power supply means including a battery, a relay connecting the battery to an output end of the power supply means or an output end of the charging means, and a power failure detection unit for detecting a power failure to operate the relay.

SMPS, charging means, battery, feedback, rectification, smoothing, voltage detection

Description

Power supply with auxiliary power means and charging means {SWITCHING MODE POWER SUPPLY EQUIPPED WITH AUXILIARY BATTERY AND CHARGER FOR THIS BATTERY}

1 is a circuit diagram of a power supply means according to the present invention.

2 is a circuit diagram of a charging means according to the present invention.

3 is a circuit diagram of the auxiliary power supply means according to the present invention.

<Description of Symbols for Main Parts of Drawings>

11,21: filter part 12,22: smooth part

13,23: switching control unit 14,24: snubber unit

15: load power supply 25: charging power supply

16, 26: feedback unit 31: power failure detection unit

The present invention relates to a power supply device having an auxiliary power supply means and a charging means, and more particularly, to supply a voltage having a constant size without noise to the load, and provided with an auxiliary power supply in case of power failure, It relates to a power supply having a charging means for charging the power.

The SMPS (Swing Mode Power Supply), which is widely used as a DC stabilized power source for electric, electronic, and communication devices, controls the flow of power using a switching process of semiconductor devices, and thus is more efficient and smaller than conventional stabilized power supplies. And it can be said to be a stabilized power supply having a great advantage in weight reduction.

For this reason, SMPS has been used in various fields, and it has been modified to meet the needs of the application and has additional functions to output stable voltage.

SMPS basically creates a pulse waveform by switching the DC voltage, boosts or steps down the voltage using a transformer, and converts it into DC to supply it to the load. There is a surge voltage in the pulse waveform generated by switching. This surge voltage not only interferes with the stable supply of power to the load, but also damages the SMPS itself. Therefore, it is necessary to sufficiently remove this surge voltage.

In addition, there is a field in which power supply to the load should not be interrupted due to power failure, such as fire fighting facilities of SMPS.

The present invention has been devised by the above-mentioned needs, and removes noise and surge voltage sufficiently to supply clean and stable power to the load, and to provide auxiliary power means in case of power failure, and to charge the auxiliary power means. An object of the present invention is to provide a power supply device having a charging means for supplying power to a load.

The power supply of the present invention for achieving the above object is mainly used in fire fighting equipment,

A first filter for filtering noise of an AC input voltage, a first smoothing part for rectifying and smoothing the voltage filtered through the first filter part, and switching a smoothed voltage through the first smoothing part based on a feedback signal A first switching control unit for transmitting to a transformer, a load power supply unit rectifying and supplying a voltage output from the first transformer to a load, and outputting a feedback signal to the first switching control unit by detecting an output voltage of the load power supply unit. Power supply means comprising a feedback unit; And,

A second filter unit filtering the noise of an AC input voltage, a second smoothing unit rectifying and smoothing the voltage filtered through the second filter unit, and switching the voltage smoothed through the second smoothing unit based on a feedback signal to switch the second A second switching controller for transmitting a transformer, a charging power supply for rectifying and smoothing a voltage output by the second transformer, and supplying a charging current, and detecting an output voltage and a current of the charging power supply and transmitting a feedback signal to the second switching controller. Charging means comprising a second feedback portion for outputting: And,

And a secondary power supply means including a battery, a relay connecting the battery to an output end of the power supply means or an output end of the charging means, a power failure detection unit for sensing an electric power and operating the relay.

An input terminal of each of the power supply and the charging device is connected to a varistor for protecting from a fuse and a surge voltage for protecting from an overcurrent input.

The first and second snubber portion for removing the surge voltage of the pulse waveform output by the first and second switching control unit is connected to the primary coil side of the first and second transformer, respectively,

The output terminal of the power supply means is characterized in that a diode is connected to prevent the power of the battery from flowing in reverse,

The power failure detecting unit of the auxiliary power supply unit includes a first comparator for detecting an output voltage of the power supply unit load power supply unit and comparing it with a set voltage, and a first transistor connected by the first comparator to operate the relay. Characterized in that made,

The first feedback part of the power supply means comprises a photodiode for detecting the output voltage of the load power supply and outputting a feedback signal to the phototransistor of the first switching control unit based on the output voltage,

The second feedback part of the charging means detects the output voltage of the charging power supply unit and based on the constant voltage unit including a photodiode for outputting a feedback signal to the phototransistor of the second switching control unit, and the charging current of the charging voltage supply unit And a constant current unit including a second transistor that is turned on when the charging current exceeds a rated current to limit a feedback signal of the constant voltage unit photodiode, and detects a voltage of the battery and compares the voltage with a reference voltage. And a third comparator and a third transistor turned on / off by the comparator to adjust a feedback signal of the constant voltage part photodiode, and including a charging mode switching part controlling a magnitude of the charging voltage supplied to the battery. Features,

The first and second filter units each include a resistor, a capacitor and an inductor connected in parallel to the input terminal,

The first and second smoothing units each include a bridge diode rectifying the input voltage, a capacitor for smoothing the output voltage of the bridge diode, and a resistor (NTC) for limiting an initial inrush current to the capacitor. ,

The first and second switching controllers are respectively coupled to an IC chip in which a switching element is incorporated, a phototransistor for transmitting a feedback signal to the IC chip, and magnetically coupled to the primary coils of the first and second transformers. And a diode and a capacitor for rectifying and smoothing the induced coil and the starting current of the coil to the IC chip.

The load power supply unit and the charging power supply unit respectively rectify a pulse waveform output by the secondary coils of the first and second transformers, and a surge voltage of a pulse waveform connected in parallel to the diode and input to the diode. And a resistor and a capacitor for protecting the diode from current, a capacitor and a inductor for filtering the output voltage of the diode, and an output terminal connected in parallel to maintain a minimum duty ratio of the first and second transformer pulse waveforms. Characterized in that it comprises a resistance,

The load power supply unit, the charging power supply unit and the charging mode switching unit is characterized in that each of the light emitting diodes for displaying the operation state is connected.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of a power supply means according to the present invention, Figure 2 is a circuit diagram of the charging means, Figure 3 is a circuit diagram of the auxiliary power supply means.

1 and 2, the power supply means and the charging means can be seen to be quite similar. Therefore, similar parts will be described together, but unless otherwise specified, 'each' means 'each of the power supply means and the charging means'.

A switch SW1 for operating the power supply is connected to an input terminal to which AC power is input, and fuses F1 and F2 for preventing overcurrent from being input are connected to the input terminals of the power supply means and the charging means, respectively. When the input AC voltage includes a surge voltage of a predetermined magnitude or more, the varistors VR1 and VR2 passing them to the input terminal are connected in parallel.

The first and second filter parts 11 and 21 for removing noise of the AC input voltage are respectively connected. The filter unit includes resistors R11 and R21 connected in parallel to the input terminal, capacitors C11 to C14, C21 to 24, and inductors L11 and L21.

The first and second smoothing parts 12 and 22 for smoothing the voltage filtered through the filter parts 11 and 21 to the DC voltage are respectively connected. The smoothing units 12 and 22 limit bridge inductors D11 and D21 to rectify the filtered voltage, capacitors C15 and C25 to smooth the rectified voltage, and initial inrush currents to the capacitors C15 and C25. This is composed of thermistor resistors NTC R12 and R22 to prevent the capacitors C15 and C25 from being damaged.

The first and second switching controllers 13 convert the smoothed voltages through the smoothing units 12 and 22 to change the pulse waveform based on the feedback signal and transmit the converted voltage to the first and second transformers T1 and T2. And 23 are respectively connected. In addition, first and second snubber parts 14 and 24 for removing a surge voltage of a pulse waveform output from the switching controllers 13 and 23 are connected to the primary coils of the transformers T1 and T2, respectively. .

The snubber parts 14 and 24 are composed of resistors R13.R23 and capacitors C16 and C26 connected in series with the diodes D12 and D22 and connected in parallel with each other.

The switching controllers 13 and 23 receive IC chips IC1 and IC2 in which switching devices such as MOSFETs are embedded, and phototransistors PT1 and PT2 that receive feedback signals and transmit the feedback signals to the IC chips IC1 and IC2. And rectifying and smoothing the starting currents of the coils TC1 and TC2 and the coils TC1 and TC2 which are magnetically coupled to the transformers T1 and T2 to generate starting currents for the IC chips IC1 and IC2. And diodes D13 and D23 and capacitors C117 and C215 that transfer to IC1 and IC2.

In addition, resistors R14 and R24 for initial starting current for initially starting the IC chips IC1 and IC2 are connected to the output sides of the smoothing units 12 and 22, respectively.

In addition, the secondary coils of the first and second transformers T1 and T2 have a load power supply unit 15 and a charging power supply unit 25 for rectifying the voltage of the output pulse waveform and supplying them to the load and the battery, respectively. It is connected.

The load power supply unit 15 and the charging power supply unit 25 are connected to the diodes D14, D15, 24, and D25 for rectifying the pulse waveform and connected in parallel with the diodes D14, D15, 24, and D25. Resistor (R15, R25) and capacitors (C17, C27) and diodes rectified through the diodes (D14, D15, D, 24, D25) to protect the diode from the pulse voltage surge voltage and current. A plurality of smooth capacitors C18 to C113, C28 to C212, inductors L12 and L22 for removing noise of the rectified voltage, and resistors for maintaining minimum duty ratios of the pulse waveforms of the transformers T1 and T2. (R16, R26), respectively. The output terminals of the load power supply unit 15 and the charging power supply unit 25 are connected to light emitting diodes LED1 and LED21 for indicating an operation state thereof, respectively. In addition, diodes D16 and D17 are connected to the output terminal of the load power supply unit 15 to prevent the power of the battery BT from flowing back into the power supply means.

The first feedback unit 16 of the power supply unit detects the output voltage of the load power supply unit 15 and transmits a feedback signal to the first switching controller 13 based on the output voltage by adjusting the duty ratio of the pulse waveform. Allow the voltage to remain constant. The first feedback unit 16 includes a photodiode PD1 whose intensity of light emitted varies according to the detected output voltage. The photodiode PD1 is coupled to the phototransistor PT1 of the first switching controller 13 to transmit a feedback signal.

The second feedback unit 26 of the charging means includes a constant voltage unit 26a for detecting the output voltage of the charging power supply unit and keeping it constant, and a constant current such that the charging current flowing into the battery BT does not exceed the rated current. The unit 26b and a charging mode switching unit 26c for sensing the voltage of the battery BT and controlling the magnitude of the charging voltage.

The constant voltage unit 26a detects the output voltage of the charging power supply unit 25 and transmits a feedback signal to the second switching controller 23 based on this to adjust the duty ratio of the pulse waveform so that the output voltage is kept constant. do. The constant voltage unit 26a includes a photodiode PD2 whose intensity of light emitted varies according to the detected output voltage. The photodiode PD2 is coupled to the phototransistor PT2 of the second switching controller 23 to transmit a feedback signal.

The constant current unit 26b detects the charging current of the charging power supply unit 25, and when the charging current exceeds the rated current, the constant current unit 26b is turned on to limit the feedback signal output from the constant voltage unit 26a photodiode PD2. It includes a second transistor (Q21). The second transistor Q21 is connected to the cathode of the constant voltage unit 26a of the photodiode PD2 so that a sufficient current flows in the photodiode PD2 even though the voltage of the discharged battery BT is low. The feedback signal output from the diode PD2 is not smaller than the voltage for the rated current of the battery BT. That is, the duty ratio of the transformer T2 pulse waveform whose magnitude is determined by the feedback signal is limited to a predetermined size or less.

When the battery BT is discharged by supplying power to the load, the charging mode switching unit 26c allows the rated current to flow into the charging current. The feedback signal of the photodiode PD2 is adjusted to receive a minimum current to compensate for self-discharge. The charging mode switching unit 26c detects a voltage of the battery BT and compares it with a preset reference voltage, and a third transistor U2 turned on / off by the second comparator U2. It is made to include (Q22), and further comprises a light emitting diode (LED22) for displaying the operating state. The reference voltage of the second comparator U2 is obtained by voltage division of the voltage output from the regulator RG connected to the battery BT. A resistor R215 is connected to the collector of the third transistor Q22, and the resistor R215 is connected to the voltage distribution point Ref of the constant voltage unit 26a, so that the transistor Q22 is turned on / off. Accordingly, the feedback signal of the photodiode PD2 of the constant voltage unit 26a is adjusted.

The operation of the second feedback unit 26 will be described below in relation to the voltage and the charging current of the battery BT. If the rated voltage supplied to the load is 24V, the normal voltage of the battery should be slightly higher than this (e.g. 27.5V), and when charging a discharged battery it will charge slightly higher than this usual voltage (27.5V) (e.g. 29V). After the self-discharge, the usual voltage is reached. If the charging current flowing into the battery BT exceeds the rated current (for example, 1A), the battery may be damaged.

When the battery BT is connected to the output terminal of the charging means charging power supply unit 25 after supplying power to the load and discharging, the second comparator U2 of the charging mode switching unit 26c detects the voltage of the battery and The third transistor Q22 is conducted by comparing it with the reference voltage and amplifying the difference. Then, the photodiode PD2 of the constant voltage unit 26a outputs a feedback signal in a direction of increasing the duty ratio of the pulse waveform of the transformer T2 to increase the charging current. When the charging current increases to reach the rated current (for example, 1A), the second transistor of the constant current unit 26b is conducted to limit the feedback signal of the photodiode PD2 so that the duty ratio of the pulse waveform no longer increases. When the rated current is continuously introduced and the battery BT is fully charged (when the battery voltage is 29V, for example), the third transistor Q22 is turned off by the second comparator U2 of the charging mode switching unit 26c. The charging current flowing into (BT) continuously decreases, and the battery (BT) loses its voltage through self discharge. When the voltage of the battery BT reaches a constant voltage (for example, 27.5V) through self-discharge, the photodiode PD2 of the constant voltage unit 26a outputs a feedback signal to maintain this voltage.

As shown in FIG. 3, the auxiliary power supply means includes a battery BT for supplying power to a load during a power failure, and a relay for connecting the battery BT to an output end of the power supply means or an output end of the charging means ( RY) and an electrostatic detection unit 31 which detects an electrostatic power and operates the relay RY.

The switch BT2 for inspection is connected to the battery BT.

The power failure detecting unit 31 is turned on / off by the first comparator U3 and the first comparator U3 which detects an output voltage of the power supply means load power supply unit 15 and compares the output voltage with a preset set voltage. And a first transistor Q3 which is turned off to operate the relay RY.

The set voltage is set by dividing a voltage output from the regulator RG connected to the battery BT. The first comparator U3 detects and amplifies the first transistor Q3 when the output voltage of the load power supply 15 drops below a predetermined value due to a power failure. The first transistor then operates the relay RY to connect the battery BT to the output terminal of the load power supply 15. When the power failure is released and the power is supplied, the first comparator U3 detects the output voltage of the load power supply unit 15 and turns off the first transistor Q3 so that the relay RY can connect the battery BT and the charging means. Connect it.

As described above, the present invention repeatedly removes noise and surge voltage, thereby supplying clean and stable power to the load, and automatically detecting the power failure and supplying battery power so that power supply to the load is not cut off. The discharged battery was then recharged so that loads such as fire fighting equipment could be maintained at all times.

In the above description of the present invention has been described with reference to the accompanying drawings, a power supply device having a secondary power supply means and a charging means having a specific circuit diagram, but the present invention can be variously modified and changed by those skilled in the art, such variations And changes should be construed as falling within the protection scope of the present invention.

Claims (8)

A switch for receiving or disconnecting power; A first filter unit for filtering noise of an AC input voltage; A first smoothing unit rectifying and smoothing the voltage filtered through the first filter unit; A first switching controller which switches the smoothed voltage through the first smoothing unit and transmits the voltage to the first transformer based on a feedback signal; A load power supply unit rectifying and smoothing the voltage output by the first transformer to supply the load; Power supply means for detecting an output voltage of the load power supply unit and including a first feedback unit for outputting a feedback signal to the first switching controller; A second filter unit for filtering noise of an AC input voltage; A second smoothing unit rectifying and smoothing the voltage filtered through the second filter unit; A second switching controller transferring a smoothed voltage through the second smoothing unit based on a feedback signal and transferring the voltage to a second transformer; A charging power supply unit supplying a charging current by rectifying and smoothing the voltage output by the second transformer; A charging means including a second feedback unit configured to detect an output voltage and a current of the charging power supply unit and output a feedback signal to the second switching controller; battery, A relay for connecting the battery to an output terminal of the power supply means or an output terminal of the charging means, A power failure detection unit for sensing the power failure to operate the relay; And an auxiliary power supply means including a check switch for forcibly turning off the connection between the battery and the output end of the power supply means. The method of claim 1, And a varistor for protecting from a fuse and a surge voltage for protecting from an overcurrent input is connected to an input terminal of each of the power supply means and the charging means. The method according to claim 1 or 2, A first and second snubber portion for removing the surge voltage of the pulse waveform output by the first and second switching control unit is connected to the primary coil side of the first and second transformer, respectively Power supply having means and charging means. The method of claim 3, wherein A power supply having an auxiliary power supply means and a charging means is connected to the output terminal of the power supply means for preventing the power of the battery from flowing back. The method of claim 4, wherein The power failure detecting unit of the auxiliary power supply unit includes a first comparator for detecting an output voltage of the power supply unit load power supply unit and comparing it with a set voltage, and a first transistor connected by the first comparator to operate the relay. Power supply having a secondary power means and charging means, characterized in that made. The method of claim 5, The first feedback part of the power supply means A photodiode for detecting an output voltage of the load power supply unit and outputting a feedback signal to the phototransistor of the first switching controller based on the output voltage; The second feedback part of the charging means A constant voltage unit including a photodiode detecting an output voltage of the charging power supply unit and outputting a feedback signal to a phototransistor of the second switching controller based on the output voltage; A constant current unit including a second transistor configured to detect a charging current of the charging voltage supply unit and to limit the feedback signal of the constant voltage unit photodiode when the charging current exceeds the rated current; A second comparator for detecting a voltage of the battery and comparing the voltage with a reference voltage, and a third transistor turned on / off by the comparator to adjust a feedback signal of the constant voltage unit photodiode, wherein the charging is supplied to the battery Power supply having a secondary power means and charging means characterized in that it comprises a charging mode switching unit for controlling the magnitude of the current. The method of claim 6, The first and second filter units each include a resistor, a capacitor and an inductor connected in parallel to the input terminal, The first and second smoothing units each include a bridge diode rectifying the input voltage, a capacitor for smoothing the output voltage of the bridge diode, and a thermistor resistor for limiting an initial inrush current to the capacitor. The first and second switching controllers are respectively coupled to an IC chip in which a switching element is incorporated, a phototransistor for transmitting a feedback signal to the IC chip, and magnetically coupled to the primary coils of the first and second transformers. And a diode and a capacitor for rectifying and smoothing the induced coil and the starting current of the coil to the IC chip. The load power supply unit and the charging power supply unit respectively rectify a pulse waveform output by the secondary coils of the first and second transformers, and a pulse waveform surge connected to the diode in parallel and input to the diode. A resistor and a capacitor for removing the voltage, a capacitor for smoothing the output voltage of the diode and an inductor for filtering the diode, and a resistor connected in parallel to the output terminal and maintaining a minimum duty ratio of the first and second transformer pulse waveforms. Power supply having a secondary power means and charging means, characterized in that made. The method of claim 7, wherein And a light emitting diode connected to the load power supply unit, the charging power supply unit, and the charging mode switching unit, respectively, for displaying an operation state thereof.

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