KR101392854B1 - Selectively driving power supply apparatus by detecting changes of load - Google Patents

Abstract

The present invention relates to a selectively driving power supply device by detecting a load variation. The power supply device converts an AC voltage into a DC voltage and supplies the DC voltage to a DC-DC conversion module. The power supply device comprises an input unit which removes electromagnetic noise from the AC voltage and rectifies and rectifies the AC voltage; and a fluctuating load power converter which includes at least two AC-DC power conversion units with optimized efficiency and power factor by load capacity, selectively drives the AC-DC power conversion units according to the capacity of the DC-DC conversion module, corrects a power factor of power delivered from the input unit, and supplies the power into the DC-DC conversion module.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply apparatus,

The present invention relates to a power supply apparatus for an LED lighting apparatus, and more particularly, to a power supply apparatus for an LED lighting apparatus that provides a stable power system with efficiency and power factor even when the load capacity of a DC-DC conversion module is varied, DC power conversion unit to reduce the voltage and current stress of the power device according to the output power change and to selectively drive the power device by detecting the load variation that can maximize the product life cycle of the power supply device ≪ / RTI >

The switching mode power supply (SMPS) is a device that converts an AC current supplied from the outside into a DC current, and then converts the AC current into electric power conforming to the conditions of various electronic apparatuses. Electricity can be varied from time to time due to various variables in the process of being transferred from the power plant to the consumer, so that electricity supplied at 220V nominal voltage is supplied with 60Hz electric power with stable sinusoidal wave depending on voltage variation due to various environmental factors it's difficult. If such irregular voltage is supplied as it is, it may lead to malfunction and deterioration of the electronic device. Even if there is a change in the input voltage, the SMPS supplies a constant output to the electronic product, thereby preventing the problem caused by the voltage fluctuation.

Also, in the case of an electric appliance driven by a low power of 220 V or less, it is impossible to drive without converting the current through a SMPS having a universal input function having a wide input voltage range. There is a risk of damage to the product if it is connected directly without SMPS.

In addition, SMPS is an essential device for low power LEDs. Some products use the same 220V AC power as an integrated LED bulb using an AC direct LED driver, but these products are not products that do not require an SMPS, but rather a non-isolated LED driver circuit .

In the case of modular high-power power supply in SMPS, when the load capacity is reduced to less than 50%, the power efficiency of the power system is significantly reduced, which greatly affects efficiency, power factor and electromagnetic interference, .

Standby mode DC-DC single module DC-DC parallel module Input current (A) 0.352  1.51  4.538 Input power (W)  45 297.5  964.1 OCP (W)  270  937 Rated output (Pout)  Output voltage (V): 48.85  240.3 W  864.4W efficiency(%) PFC maximum capacity: 1340W 80.73% 89.66% (91.16%) Power factor (PF) 0.580 0.897 0.981 Measured value with APS-9102 instrument /
Deviation value 1.5%

For example, Table 1 provides the input current, input power, output power, efficiency, and power factor measured in standby mode, DC-DC single module, and DC-DC parallel module, respectively, of a modular high power power supply according to the prior art do. Table 1 shows the results of the measurement of the power supply with input power of 1.2 kW class of single-phase 60 Hz and AC single-phase 60 Hz 220V. The DC-DC parallel module has an output power of 864.4W at the maximum load, an efficiency of 89.66%, and a power factor of 1340W. The DC-DC single module has an output power of 240.3W, an efficiency of 80.73% and a power factor of 0.897. The power factor was measured as 0.981.

Referring to Table 1, the DC-DC single module and the DC-DC parallel module have an efficiency difference of about 9% or more. That is, when the output power due to the module load is lower than the total power that can be supplied by the power supply device, the efficiency is greatly reduced.

Patent Literature 1 relates to a voltage stabilizing device for a switching mode power supply. In a low power consumption mode such as a power-off mode or a stand-by mode of the SMPS, even if the load of the power supply drops sharply, So that it is possible to prevent malfunction of the amplifier circuit.

1. Korean Published Patent Application No. 2009-0038315 (published on April 20, 2009)

In order to solve the above problems, an AC-DC power conversion unit is selectively driven according to a load capacity variation of a DC-DC conversion module, thereby improving a power factor and an efficiency characteristic and reducing a voltage and a current stress of the power device It is an object of the present invention to provide a power supply device that selectively detects a load variation that can maximize a product life cycle of the power supply device and drives the power supply device.

According to an aspect of the present invention, there is provided a power supply apparatus for detecting and varying load variation according to the present invention includes an input unit for removing and rectifying EMI (electromagnetic wave) noise of the AC voltage, DC converter module, and selectively drives the AC-DC power converter according to the capacity of the connected DC-DC converter module to power-factor the power transferred from the input unit to supply the power to the DC-DC converter module And a variable load power converter.

In a preferred embodiment of the present invention, the variable load power converter selectively activates a high-output control signal or a low-output control signal according to the number of the connected DC-DC conversion modules, A high power AC-DC power converter for power-factor-compensating the power from the input unit and transmitting the power factor to the DC-DC converter module when the high output control signal is activated, DC power conversion unit and the low-output AC-DC power conversion unit for converting the power from the input unit into power and compensating for power to the DC-DC conversion module as the signal is activated, DC power conversion unit or the low-output AC-DC power conversion unit through the high-power AC-DC power conversion unit And a connection part for distributing electric power to the DC-DC conversion module.

In a preferred embodiment of the present invention, the connection unit includes a switch for transmitting connection state information of each DC-DC conversion module to the control unit, and a switch for supplying the connection from the high-output AC-DC power conversion unit or the low- And a power distributing unit for distributing power to the respective DC-DC conversion modules.

In a preferred embodiment of the present invention, the variable load power converter comprises: a power system that remotely receives power supply information and connection number information of the DC-DC conversion module from the connection unit and receives efficiency, power factor, or power information from the control unit; And a monitoring unit.

According to a preferred embodiment of the present invention, the controller includes a driver controller selectively activating a high-output driver drive signal or a low-output driver drive signal in accordance with the number of the DC-DC conversion modules, DC converter and optimizes impedance matching to drive the high-output AC-to-DC converter, and optimizes impedance matching with the low-output AC-to-DC converter as the low-output driver signal is activated, And a low output driver for driving the conversion section.

The present invention has the effect of providing a power system with stable efficiency and power factor even when the DC-DC module type load is varied.

The present invention selectively drives an AC-DC power conversion unit designed optimally according to the capacity of a load, thereby improving the efficiency and reducing the current and voltage stress of each power device according to the output power, thereby extending the life of the product .

The present invention can provide the user with information on power factor, efficiency, and power monitored by a wired or wireless system to prepare for unexpected emergency situations.

The present invention relates to a high-power LED lighting equipment system in which an AC-DC conversion unit and a DC-DC module are modularized in a predetermined capacity and arranged in parallel, and a load is sensed to selectively drive an AC- Can be improved.

FIG. 1 is a configuration diagram of a power supply device for selectively detecting a load variation according to a first embodiment of the present invention,
FIG. 2 is a configuration diagram of a power supply device for selectively detecting a load variation according to a second embodiment of the present invention,
FIG. 3 is a flowchart illustrating an operation of a power supply apparatus for selectively detecting a load variation according to the present invention,
4 is a detailed block diagram of a driver control unit according to the present invention;
5 is a detailed configuration diagram of a selection driver according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings illustrate only the essential features of the invention in order to facilitate clarity of the invention and are not to be construed in a limiting sense since they are not shown in the accompanying drawings.

1 to 5, a power supply device for selectively detecting a load variation according to the present invention will be described.

The power supply device selectively detects the load variation according to the present invention as shown in FIG. 1 and includes an EMI filter 10, an inrush current limiter 20, a rectifier 30, A variable load power converter 40 composed of a high output AC-DC power conversion section 41, a low output AC-DC power conversion section 42, a control section 43 and a connection section 44 (docking stage) (50).

The EMI filter 10 eliminates electromagnetic interference noise of an input AC voltage.

The inrush current limiting unit 20 limits the inrush current generated in the initial charging state of the input capacitor to a constant current level to prevent damage to the bridge diode and the switching device at the input terminal.

The rectifying unit 30 rectifies the output of the inrush current limiting unit 20 and may be implemented by a diode or a bridge diode.

The variable load power converter 40 selectively drives the AC-DC power conversion units 41 and 42 according to the capacity of the connected DC-DC conversion converters 61, 62, It is possible to provide a constant efficiency.

The high output AC-DC power converting unit 41 operates in response to the activation of the high output control signal HI POWER PACK_ENA output from the controller 43 to adjust the power factor from the output voltage of the rectifying unit 30, . The high output AC-DC power conversion section 41 operates in a period in which the required power of the DC-DC conversion modules 61, 62, 63 is 50 to 100% of the maximum power that the variable load power converter 40 can supply . The high output AC-DC power converting section 41 can be realized by a high output inductor L1 and a power MOS transistor M1 and a diode D1 as shown in FIG. have.

The low output AC-DC power converting unit 42 operates when the low output control signal (LOW POWER PACK_ENA) output from the controller 43 is enabled to adjust the power factor of the power transmitted from the rectifying unit 30, 44). The low output AC-DC power conversion section 42 operates in the interval of 0 to 50% of the maximum power that the DC-DC conversion modules 61, 62, 63 can supply to the variable load power converter 40. The low-output AC-DC power conversion unit 42 may be implemented by a low output inductor L2, a power MOS transistor M2, and a diode D2, for example, as shown in FIG.

Also, the high output AC-DC power conversion unit 41 and the low output AC-DC power conversion unit 42 are connected to each other through a short circuit, an overload or over temperature, a PFC overvoltage, It is possible to further include a function of blocking the PFC open-loop and a constant current control function.

The control unit 43 receives the number of the DC-DC conversion modules 61, 62, and 63 connected to the connection unit 44 and the supplied power information and outputs the summed capacity of the DC-DC conversion modules 61, 62, The high output control signal (HI POWER PACK_ENA) is activated when the total power is 50% or more, and the low output control signal (LOW POWER PACK_ENA) is activated when the power is less than 50%.

The control unit 43 controls the power standby period of the power fluctuation period and controls on / off of the DC-DC conversion modules 61, 62 and 63 so that the variable load power converter 40 can control the DC- 61, 62, 63).

3, before the power transmission to the load is started, the control unit 43 determines whether the power transmission characteristics of the high output AC-DC power conversion unit 41 and the low output AC-DC power conversion unit 42 are normal / abnormal DC conversion module through the switch of the connection unit 44 and the power transmission line and the output power information in order to provide a high efficiency power characteristic according to the power capacity of the DC-DC conversion module . The control unit 43 forcibly drives the power supply according to the number of switches H / W turned on at the connection unit 44 during the initial operation, and then, through the power information received via the power transmission line, DC converter 41 and the low-output AC-DC power converter 42. [ That is, since the power supply information of the DC-DC conversion module is not known by the power supply device in the initial period in which the power supply is started, only the number of the DC-DC conversion modules mounted on the connection part 44 and driven, And selectively drives the conversion unit 41 and the low-output AC-DC power conversion unit 42. Thereafter, the high-output AC-DC power conversion unit 41 and the low-output AC-DC power conversion unit 42 can be selectively driven through the actual power information fed back from the DC-DC conversion module.

The controller 43 may be implemented by a driver control unit and a selection driver. 4 to 5 are detailed circuit diagrams of the driver control unit and the selection driver.

The controller 43 controls the output of the DC-DC converter according to the number of DC-DC modules and a driver controller for controlling the high-output driver or the low-output driver according to the on / off signal of the DC- 41 and a low-output AC-DC power conversion unit 42. [0064] The present invention is designed such that the output impedance of the high output AC-DC power converting section 41 and the output impedance of the low output AC-DC power converting section 42 match the gate resistance of the power MOSFET according to the number of load modules By including one optional driver, the effect of power noise and the parasitic capacitance of the power pattern can be minimized.

4 is a diagram illustrating an example of a driver control unit. The driver control unit checks whether or not at least one DC-DC conversion module 61, 62, 63 is connected through an OR logic gate, DC converter module (Module 4) to the sixth DC-DC conversion module (Module 6) are connected to the connection end of the high-output driver driving signal (HI DRIVER) And activates a low output driver driving signal (LOW DRIVER) when a low output power of less than 50% is required.

The driver controller may be implemented with a plurality of logic gates, a comparator, a resistor, a capacitor, and a zener diode so that a high output driver or a low output driver among the select drivers shown in FIG. 5 selectively operates according to the load capacitance.

5 includes a high output control signal HI POWER PACK_ENA for selectively driving the high output AC-DC power conversion section 41 and the low output AC-DC power conversion section 42 and a low output control signal LOW POWER_ENA for selectively driving the low output AC- PACK_ENA).

5, when the high output driver driving signal HI DRIVER, which is the output signal of the control unit 43 shown in FIG. 4, is activated, the high output AC-DC power converting unit 41 and the high output driver The low output driver 43-1 operates to output the high output control signal HI POWER PACK_ENA and when the low output driver drive signal LOW DRIVER is activated, the low output AC-DC power converter 42 and the low output driver 43-2 operate to output a low output control signal LOW POWER PACK_ENA. The select driver shown in FIG. 5 is connected to a power train through a serial resistor at the output of each high-output driver and the low-output driver.

The output signal of the selection driver is input to the gates of the MOS transistors M1 and M2 shown in FIG. 2, for example. The selection driver maximizes the impedance matching with the gates of the MOS transistors M1 and M2, thereby reducing power noise and reducing the influence of the parasitic capacitance.

The connection section 44 connects the mounted DC-DC conversion modules 61, 62 and 63 to the high output AC-DC power conversion section 41 or the low output AC-DC power conversion section 42 of the variable load power converter 40, And a switch for confirming whether or not the DC-DC conversion module 61, 62, 63 is connected to the variable load power converter 40 and a switch for confirming whether or not the high output AC-DC power conversion unit 41 or the low output AC- A power distribution unit for distributing power supplied from the conversion unit 42, and a power train for transmitting power to the DC-DC conversion modules 61, 62 and 63. The connection unit 44 may include a circuit for controlling the external wired / wireless power control of the DC-DC conversion modules 61, 62 and 63.

The connection unit 44 transmits the on / off information of the module for forcedly driving only the quantity information of the DC-DC conversion modules 61, 62, 63 to the DC-DC conversion modules 61, 62, DC conversion modules 61, 62, and 63 so as to stabilize the power system, and monitors information such as power and temperature of the real-time power supply unit And transmits it to the power system monitoring unit 50.

The power system monitoring unit 50 can remotely monitor the current, voltage, and temperature of the variable load power converter 40 to immediately check whether the power system is abnormal. The power system monitoring unit 50 may be implemented by a mobile communication terminal and a personal PC.

The DC-DC conversion module 61, 62, 63 mounted on the connection part 44 can be mounted in proportion to the maximum capacity of the variable load power converter 40, and the DC-DC conversion module The sum of the capacitances of the respective DC-DC conversion modules 61, 62, 63 as the load capacitors 61, 62, 63 is determined by the maximum capacity of the variable load power converter 40.

2, the control unit 43 activates the high output control signal HI POWER PACK_ENA to allow the power of the rectifying unit 30 to be connected to the connection unit 44 by the high output inductor L1 . The control unit 43 activates the low power control signal LOW POWER PACK_ENA so that the power of the rectifying unit 30 is transferred to the connection unit 44 by the low output inductor L2. The high output inductor L1 uses an inductor suitable for high output transmission and the low output inductor L2 uses an inductor suitable for low output transmission to selectively use an inductor designed optimally for the output characteristic of the DC- The stress generated in the power devices due to the increase of the output capacity can be reduced, and the life of the product can be prolonged.

The operation of the power supply device according to the present invention will be described with reference to FIG. 3. In the initialization step, whether or not the mobile communication terminal 40, which is the variable load power converter 40, Confirms the user and administrator setting information, and displays a communication error alarm on the terminal when connection is not established, and attempts to reconnect. When the user and manager setting information is confirmed, the high output AC-DC power conversion section 41 and the low output AC-DC power conversion section 42 of the variable load power converter 40 test whether the output voltage is normal. If the output voltage is abnormal, it transmits an abnormal signal to the terminal and displays a warning alarm.

The connection unit 44 transmits switch information to the control unit 43 in order to forcibly drive based on the quantity information of the DC-DC conversion modules 61, 62 and 63 during the initial operation. Thereafter, the power distribution function of the power transmission line is performed to stabilize the system, and information for real-time monitoring of the power supply is transmitted to the power system monitoring unit 50.

DC power conversion unit 41 and the low output AC-DC power conversion unit 42 in the initial operation to determine whether each of the AC-DC power conversion units 41 and 42 is normal or not. Thereafter, the quantity of the DC-DC conversion modules 61, 62, 63 connected through the confirmation switch of the DC-DC conversion modules 61, 62, 63 of the connection unit 44 is counted, And drives the AC-DC power converting section 41 or the low-output AC-DC power converting section 42. At this time, the output of the DC-DC conversion module assumes the maximum output.

When it is ascertained that the output voltages of the high output AC-DC power conversion section 41 and the low output AC-DC power conversion section 42 are normal, the maximum capacity of the load is tested as the number of the DC-DC conversion modules 61, do. When the control unit confirms the total output power, the high output AC-DC power conversion unit 41 and the low output AC-DC power conversion unit 42 are selectively driven according to the capacity of the load. The high output AC-DC power conversion section 41 is driven by 50% or more of the total power due to the capacity of the load, and the low output AC-DC power conversion section 42 is driven by 50% When each of the AC-DC power conversion units 41 and 42 is driven according to the capacity of each load, the connection unit 44 distributes power to each DC-DC conversion module.

When the initial operation is performed in the low output AC-DC power conversion section 42, the confirmation switch of the DC-DC conversion modules 61, 62 and 63 of the connection section 44 is connected when the output increase is subsequently performed, The number of DC-DC conversion modules is counted through the logical operators of OR gates and AND gates. When the number of DC-DC conversion modules is 50% or more of the total number of DC-DC conversion modules, the high output AC-DC power conversion section 41 is driven to check the actual output power monitored. Compare the same. If the actual output power module count does not match, a warning alarm is displayed on the terminal.

When the number of the DC-DC conversion modules 61, 62, 63 is reduced after the initial operation is performed in the high output AC-DC power conversion section 41, the DC-DC conversion module The number of DC-DC conversion modules is counted by the connected number of the confirmation switches. If the number of modules is 50% or less, the selection driver drives the low output AC-DC power conversion section 42, The power conversion section 41 is turned off. The low output AC-DC power conversion unit 42 checks the actual output power monitored after the driving to check whether the actual output is equal to the number of modules. If the actual output power module count does not match, a warning alarm is displayed on the terminal.

Thereafter, the high-output AC-DC power conversion unit 41 or the low-output AC-DC power conversion unit 42 is selectively driven in accordance with the actual output. In order to prevent the inconsistency of power, the connection unit 44 performs power distribution DC-DC conversion modules 61, 62, and 63, respectively.

If the selection of the power distribution and AC-DC power conversion unit is abnormal, a warning alarm is displayed on the terminal. Power distribution is performed, and the system status (voltage, current, temperature) is checked. If it is normally monitored, the power is distributed stably, so the power monitoring is terminated, data is stored and transmission to the terminal is stopped. If the system status is not normal, a warning alarm is displayed on the terminal.

The load power is divided into 50% or more and less than 50% of the total electric power by the high output AC-DC power conversion section 41 and the low output AC-DC power conversion section 42 which are the two AC- However, the present invention is not limited to this, and the ratio of the capacity of the DC-DC conversion modules 61, 62, 63 to the maximum capacity of the power supply device may be divided into more than AC-DC The efficiency and the power factor can be optimized through the power conversion unit.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You will understand.

10: EMI filter 20: Inrush current limiting section
30: rectification part 40: variable load power converter
50: power system monitoring section 60: DC-DC conversion module
41: high power AC-DC power conversion unit 42: low output AC-DC power conversion unit
43: control unit 44: connection unit (docking stage)

Claims (5)

A power supply apparatus for converting an AC voltage into a DC voltage and supplying the DC voltage to a DC-DC conversion module,
An input unit for removing and rectifying the electromagnetic noise of the AC voltage, and a variable load power converter,
The variable load power converter includes:
A control unit selectively activating a high output control signal or a low output control signal according to the number of connected DC-DC conversion modules and power information, and controlling on / off of the power standby period of the power variation period and the DC-DC conversion module;
A high-power AC-DC power converter for power-factor-compensating the power of the input unit when the high-power control signal is activated and transmitting the power-factor-adjusted power to the DC-DC converter module;
A low-power AC-DC power converter for power-factor-compensating the power of the input unit when the low-power control signal is activated,
And a connection unit for connecting the high-output AC-DC power conversion unit or the low-output AC-DC power conversion unit to the DC-DC conversion module through a power transmission line to distribute electric power. Power supply. delete The method according to claim 1,
Wherein the connecting portion comprises:
A switch for transmitting connection state information of each DC-DC conversion module to the control unit, and connecting or disconnecting the DC-DC conversion module and the variable load power converter;
A power distributing unit for distributing power supplied from the high output AC-DC power converting unit or the low output AC-DC power converting unit to each DC-DC converting module;
And a power transmission line for transmitting power to each DC-DC conversion module. The method according to claim 1,
The variable load power converter includes:
A power system monitoring unit that receives power supply information and connection number information of the DC-DC conversion module from the connection unit and receives efficiency, power factor, temperature, or power information from the control unit and informs the power supply apparatus of real- And a power supply unit for detecting a load fluctuation and selectively driving the load. The method according to claim 1,
Wherein,
A driver controller for selectively activating a high-output driver drive signal or a low-output driver drive signal in accordance with the number of the DC-DC conversion modules;
A high output driver for driving the high output AC-DC converter by impedance matching with the high output AC-DC power converter as the high output driver driving signal is activated, and
And a low-output driver for driving the low-output AC-DC converter by impedance matching with the low-output AC-DC power converter as the low-output driver driving signal is activated. Device.

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