KR101452059B1 - Power suuplying apparatus and power supplying apparatus - Google Patents

Abstract

The present invention relates to a power supply device and a power supply device for illumination that can eliminate the power unbalance between a resonant inverter and a drive circuit by forming an LLCC resonance tank and an inductance of a DC conversion circuit connected to the rear end of an LCC resonant inverter, an inverter for converting an input power into a predetermined AC power by an inductor-inductor-capacitor-capacitor resonance method; And a transformer having an inductance forming an inductor and an inductor-capacitor-capacitor (LLCC) resonant tank, wherein the AC power supplied from the inverter is rectified through the transformer, the rectified power is switched, And a power supply unit for lighting.

Description

POWER SUPPLY APPARATUS AND POWER SUPPLYING APPARATUS [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply apparatus and a power supply apparatus for lighting that eliminate a power imbalance between an input power supply and an output power supply.

In general, fluorescent lamps contain harmful substances such as mercury, and lamp life is short as well as 10,000 hours or less, and low-frequency flicker causes eye fatigue. On the other hand, a light emitting diode (LED) does not contain harmful substances at all and thus has no fear of environmental pollution and has a low frequency flicker due to high frequency driving.

In addition, power consumption is very low at 75% compared to fluorescent lamps and has a long life span of more than 40,000 hours. Therefore, it is expected to be a next-generation illumination light source that is well suited to environment-friendly and high-oil prices era. Recently, researches on LED devices and driving circuits have been actively conducted

In order to replace the fluorescent lamp with the LED lighting, it is necessary to replace the fluorescent lamp ballast driven by the existing AC voltage, There is an increasing demand for a fluorescent lamp stabilizer compatible LED driver circuit so that the LED lighting lamp can be used in place of a fluorescent lamp without changing the lighting equipment that has already been built up.

In such a fluorescent lamp stabilizer compatible LED driving circuit, since the fluorescent lamp is required to turn on high voltage at the time of initial startup, most of the fluorescent lamp stabilizers are LCC resonant inverters that can be stepped up as shown in Fig. 1 of the invention described in the prior art document In order to drive the LED by using it as an input, a separate driving circuit connected in series to the rear end of the ballast is required.

However, there is a problem that the voltage stress is excessively applied to the circuit element due to the power unbalance between the LCC resonant inverter and the drive circuit.

Korean Patent Laid-Open Publication No. 10-2012-0098441

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-mentioned problems, and it is an object of the present invention to provide an inductance and an LLCC resonance tank of a DC conversion circuit connected to the rear end of an LCC resonance inverter, We propose a power supply and lighting power supply.

According to an aspect of the present invention, there is provided an inverter for converting an input power into a predetermined AC power using an inductor-inductor-capacitor-capacitor (LLCC) resonance method. And a transformer having an inductance forming an inductor and an inductor-capacitor-capacitor (LLCC) resonant tank, wherein the AC power supplied from the inverter is rectified through the transformer, the rectified power is switched, To a power supply unit.

According to one technical aspect of the present invention, the inverter may include an inductor-capacitor-capacitor (LCC) resonant tank.

According to one technical aspect of the present invention, the inductance of the transformer may be the magnetization inductance of the transformer.

According to one technical aspect of the present invention, the converter includes: a rectifying unit for rectifying AC power from the transformer; A converting unit for switching the power source rectified by the rectifying unit according to the control and converting the power source into the DC power source; And a control unit for comparing the level of the DC power supply of the converter with a preset target power level to reduce the switching duty of the converter if the level of the DC power is higher than the target power level, The switching unit may further include a control unit for increasing the switching duty of the converter if the power level is lower than the power level and maintaining the switching duty of the converter if the power level of the DC power is equal to the target power level.

According to one technical aspect of the present invention, the rectifying section may include a half-wave rectifying or current-carrying circuit.

According to one technical aspect of the present invention, the rectifying section may further include an LC (inductor-capacitor) filter or a C (capacitor) filter.

According to one technical aspect of the present invention, the converting unit may be constituted of one of an insulating type converting circuit and an non-converting type converting circuit.

According to one technical aspect of the present invention, the converting unit may be one of a reduced pressure type converter, a step-up type converter, and a step-up / down type converter.

According to another aspect of the present invention, there is provided a transformer comprising: an transformer having an inductance forming an external circuit and a resonance tank, the transformer receiving an AC power converted by the resonance tank; A rectifying unit for rectifying the AC power from the transformer; A converting unit for switching a power source rectified by the rectifying unit to convert the power source into a predetermined direct current power source and supplying it to the illuminator; And a control unit for decreasing the input / output power supply ratio when the level of the DC power supply is higher than the target power supply level and increasing the input / output power supply ratio when the power level of the DC power supply is lower than the target power supply level .

According to another technical aspect of the present invention, there is further provided a ballast for converting an input power to an AC power set in advance by forming an inductor-inductor-capacitor-capacitor (LLCC) resonance tank by an LLCC resonance method can do.

According to another technical aspect of the present invention, the illuminator may include at least one light emitting diode.

According to the present invention, there is an effect that the power unbalance between the LCC resonant inverter and the drive circuit can be solved by controlling the switching of the DC conversion circuit connected to the rear end of the LCC resonant inverter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a power supply device of the present invention; FIG.
2 is a graph of output waveforms of a typical half bridge inverter.
3 is an output waveform graph of a rectifying section of the power supply device of the present invention.
4A and 4B are graphs of output power and rectified terminal voltage waveforms according to equivalent resistances of a general LCC resonant inverter.
5A and 5B are graphs of output power and rectified output voltage waveforms according to the equivalent resistance of the LCC resonant inverter employed in the power supply device of the present invention when magnetizing inductance is fixed.
FIGS. 6A and 6B are graphs of output power and rectified output voltage waveforms according to the equivalent resistance of the LCC resonant inverter employed in the power supply device of the present invention when the turn ratio is fixed at 1: 1.
7A to 7C are circuit diagrams schematically illustrating embodiments of a rectifying portion employed in the power supply device of the present invention.
8A to 8C are circuit diagrams schematically illustrating embodiments of the conversion section employed in the power supply device of the present invention.
9 is an equivalent impedance graph when the conversion part employed in the power supply device of the present invention is a buck converter.
10A and 10B are graphs of output power and rectified terminal voltage according to the operation ratio of a buck converter switch in a general LCC resonant inverter.
FIGS. 11A and 11B are graphs of output power and output voltage of a rectification section when the conversion section employed in the power supply apparatus of the present invention is a buck converter.
12 is a table showing an equivalent impedance, a rectified part output voltage, and a final output power according to a switching operation ratio when the conversion part employed in the power supply device of the present invention is a buck converter.
13 and 14 are graphs of simulation of the power supply of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The same or similar reference numerals are used throughout the drawings for portions having similar functions and functions.

In addition, in the entire specification, when a part is referred to as being 'connected' with another part, it is not only a case where it is directly connected, but also a case where it is indirectly connected with another element in between do.

Also, to include an element means to include other elements, not to exclude other elements unless specifically stated otherwise.

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

1 is a schematic configuration diagram of a power supply device of the present invention.

Referring to FIG. 1, the power supply 100 of the present invention may include an inverter 110 and a converter 120.

The inverter 110 may convert an input power source to an AC power source, specifically, a resonance type inverter, and more particularly, an LCS (Indrator-Capacitor-Capacitor) resonance type inverter.

Such an inverter 110 may be employed as a fluorescent lamp ballast.

Converter 120 can rectify the AC power from inverter 110 and convert it into DC power.

That is, the converter 120 may supply DC power to at least one light emitting diode (LED) in more detail than the illuminator to drive the light emitting diode.

Accordingly, the converter 120 may be coupled to the inverter 110 or the fluorescent ballast provided in advance on the wall or ceiling to drive the light emitting diode. Accordingly, the light emitting diode can be easily driven by being coupled to the existing lighting circuit without replacing the fluorescent lamp ballast.

However, the inverter 110 (fluorescent lamp ballast) is optimized for use in a fluorescent lamp, and power imbalance may occur between the converters 120.

To this end, the converter 120 may include a transformer 121, a rectifying unit 122, a converting unit 123, and a control unit 124.

The transformer 121 may be composed of a primary winding receiving an AC power from the inverter 110 and an insulation transformer of the inverter 110 according to the winding ratio in the rectifying unit 122 electrically insulated from the primary winding. Lm, Cp, and Cs) that are electrically connected to the LCC resonance tanks of the inductor-inductor-capacitor-capacitor (LLCC). The inductance may be a magnetization inductance (Lm) of the transformer 121.

The rectifying unit 122 rectifies the AC power of the inverter 110 transmitted through the transformer 121. The converting unit 123 switches the rectified power rectified by the rectifying unit 122 according to the control signal And the control unit 124 increases the effective switching duty ratio of the conversion unit 123 to increase the input / output voltage conversion ratio when the level of the DC power of the conversion unit 122 is not higher than the target level, If the level of the DC power of the unit 123 is equal to or higher than the target level, the effective switching duty ratio of the conversion unit 123 can be reduced to reduce the input / output voltage conversion ratio.

FIG. 2 is a graph of the output waveform of the inverter of the power supply of the present invention, and FIG. 3 is a graph of the output waveform of the rectifier of the power supply of the present invention.

2, the DC input voltage Vg is power-converted by the switching operation of the switches M1 and M2 of the inverter 110 and is switched by the switching of the switches M1 and M2 of the inverter 110 As shown, an AC square wave having a peak value of Vg / 2 to -Vg / 2 is generated by the operation of the output power supply Vs. Therefore, only the fundamental wave component Vs1 of the output power supply Vs can be expressed by the following equation (1).

(Equation 1)

As a result, the AC voltage (Vinv) switches (M1, M2), the switching frequency fs fundamental wave only valid, and the input voltage of the LLCC resonant tank (Vs) and the phase (j _R) component of the inverter 110 to jonhae The AC voltage Vinv of the inverter 110 is expressed by the following equation (2).

(Equation 2)

Since the inductance of the current iLf flowing through the inductor Lf of the rectifying unit 122 is very high so that the current level is constant, the AC current iLf flowing from the transformer 121 to the rectifying unit 122 iinv are in phase with the AC voltage Vinv of the inverter 110 and are in the form of a square wave. Therefore, if only the fundamental wave component of the alternating current iinv is obtained, the following Equation 3 is obtained.

(Equation 3)

Therefore, the equivalent impedance Re viewed from the front end of the transformer 121 is expressed by the following equation (4) since the alternating current iinv and the alternating current power source Vinv are in phase with each other.

(Equation 4)

The output voltage Vlink of the rectifying unit 122 is equal to the average of the absolute values of the alternating-current voltage Vinv.

(Equation 5)

Therefore, the Equivalent Impedance (Re) is expressed by Equation (6) by Equations (4) and (5).

(Equation 6)

The equivalent impedance Re seen from the front end of the transformer 121 acts as a load of the LLCC resonant inverter as shown in Fig. 1, so the voltage conversion ratio H (fs) of Vinv (fs) to Vs1 View the MathML source

(Equation 7)

이다.
here,

to be.

Therefore, the final input / output relation expression Vlink (fs) / Vg of the LLCC resonant inverter 110, the transformer 121, and the rectifying section 122 can be obtained from the equations (1), (5) and (7)

(Equation 8)

In addition, when the inverter 110 has a full bridge switch, the input voltage Vs is twice as large as that of the half bridge switch,

4A and 4B are graphs of output power and rectified short-circuit voltage waveforms according to equivalent resistances of a general LCC resonant inverter.

Referring to FIG. 4A and FIG. 4B, for a resonance tank of Cg = 20.2 nF, Lr = 2.793 mH, Cp == 5.6 nF, for example, Vg = 311 V and switching frequency fs = 47 kHz, The graph of the output power and the rectified voltage waveform according to the equivalent resistance of the resonant inverter can be seen.

5A and 5B are graphs of output power and rectified output voltage waveform according to the equivalent resistance of the LCC resonant inverter employed in the power supply apparatus of the present invention in which magnetization inductance is fixed, and FIGS. 6A and 6B Is a graph of output power and rectified output voltage waveform according to the equivalent resistance of the LCC resonant inverter employed in the power supply device of the present invention when the turn ratio is fixed at 1: 1.

4A and 4B, the output power Po and the output link voltage Vlink according to the value of the output load resistance Req of the LCC resonant inverter can be seen. For example, when the output power is 80W, the output load resistance Req is about 2kohm or 31kohm from Fig. 4a. However, referring to FIG. 4B, it can be seen that when the output load resistance Req is 2 kohm, the output link voltage Vlink is about 350 V, while when 31 kohm is about 1400 V, In other words, the output power Po increases as the output load resistance Req increases, and then decreases again. The output link voltage Vlink increases continuously as the output load resistance Req increases, Saturated. As a result, it can be seen that the LCC resonant inverter is suitable to operate in a region where the equivalent resistance is small.

5A and 5B show the output power and the link voltage according to the equivalent resistance Req at the magnetization inductance Lm = 4 mH of the transformer 121. As the turn ratio decreases, the maximum value of the LLCC resonant inverter It can be seen that the output point shifts to the right, and the maximum link voltage increases at this time. Referring to FIGS. 6A and 6B, the output power and the link voltage according to the variation of the equivalent resistance Req when the turn ratio of the transformer 121 is fixed at 1: 1 are shown. As shown in the figure, the maximum power and the link voltage of the LLCC resonant inverter decrease as the magnetization inductance Lm of the transformer decreases. 4A and 4B, FIGS. 5A and 5B, and FIGS. 6A and 6B, the LLCC resonant converter of the present invention changes the turn ratio and the magnetization inductance L _m of the transformer, It can be confirmed that the resonance tank of the equivalent resistance can be controlled and the use area of the equivalent resistance is not limited.

7A to 7C are circuit diagrams schematically showing embodiments of a rectifying section employed in the power supply apparatus of the present invention.

7A to 7C, the rectifying unit employed in the power supply apparatus of the present invention may include a half-wave rectifying or full-wave rectifying circuit, and may further include an LC filter (Lf or Lf1 and Lf2 and Clink). Although not shown, it may further include only a C filter

8A to 8C are circuit diagrams schematically illustrating embodiments of the conversion section employed in the power supply apparatus of the present invention.

8A to 8C, the conversion unit 123 employed in the power supply of the present invention may be configured as a non-isolated buck converter, a non-isolated boost converter, or a non-isolated buck boost converter. Although not shown, the conversion unit 123 may be an isolated buck converter having an isolation transformer, an isolated boost converter, or an isolated buck-boost converter.

For example, in the buck converter of FIG. 8A, when the switch M3 is continuously turned on, the equivalent impedance Req becomes an output resistance, and when the switch M3 is continuously turned off, the switch M3 has an infinite impedance. It can be seen that the equivalent impedance (Req) can be adjusted from the output resistance to the infinite impedance according to the duty ratio (duty). Similarly, in the case of the boost converter of FIG. 8B, when the switch M3 is continuously turned on, the equivalent impedance Req becomes '0' and when the switch M3 is continuously turned off, it has the same impedance as the output resistance, It can be seen that the equivalent impedance (Req) can be adjusted from 0 to the output resistance depending on the switching operation duty ratio (duty). In the case of the buck-boost converter shown in FIG. 8C, the equivalent impedance Req becomes '0' when the switch M3 is continuously turned on. When the switch M3 is continuously turned on, the impedance becomes infinite when the switch M3 is continuously turned off. It can be seen that the equivalent impedance Req can be adjusted from 0 to an infinite impedance.

For example, the equivalent resistance (Req) of the buck converter can be expressed by Equation (9).

(Equation 9)

여기서,

이다.

here,

to be.

9 is an equivalent impedance graph according to switching application ratio of the conversion unit when the conversion unit employed in the power supply apparatus of the present invention is a buck converter.

FIGS. 10A and 10B are graphs of output power and rectified terminal voltage according to the operation ratio of the buck converter switch in the case of a general LCC resonant inverter, and FIGS. The output power of the case and the output voltage of the rectifying part.

The equivalent impedance Req of the buck converter according to the operation ratio D of the switch M3 of the buck converter and the link voltage Vlink and the final output power Po are shown using Equation 8 and Equation 9 9, 11A and 11B. As shown in FIG. 9, when the switching operation ratio D is 0, the equivalent impedance Req has a value of infinity, so that the output power Po is '0' as shown in FIGS. 11A and 11B, (Vlink) has a maximum value, the equivalent impedance Req decreases, the output power (Po) increases, and the link voltage (Vlink) decreases as the switching operation ratio gradually increases. In comparison with the general LCC resonance inverter shown in FIGS. 10A and 10B, when the transformer 121 is inserted, the maximum power is reduced as compared with the case where the resonance tank of the LCC resonance inverter is used as it is. However, Can be confirmed that the fertilization rate is shifted from 0.11 to 0.9. In addition, the link voltage (Vlink) shows that the link voltage (Vlink) is about 350 V or more in the case of the LCC resonant inverter, but the maximum link voltage is about 67 V when the transformer 121 is inserted . Therefore, it can be confirmed that the maximum power point and the link voltage Vlink can be designed by adjusting the magnetizing inductance Lm of the transformer 121 and the winding ratio.

12 is a table showing the equivalent impedance, the rectified part output voltage, and the final output power according to the switching operation ratio in the case where the conversion part employed in the power supply device of the present invention is a buck converter, and Figs. 13 and 14 are graphs Lt; / RTI >

Using Equation (8) and Equation (9), the equivalent impedance Req, the link voltage (Vlink) and the final output power (Po) of the buck converter according to the operation ratio D of the switch M3 of the buck converter, . According to the values shown in the table of FIG. 12, when the final output voltage V _o is controlled to be 30 V, simulation is performed by setting the final load resistance of the buck converter to R _o = 35.52 [ohm] so as to output the output power of 25.34 W The result is shown in Fig. As shown in FIG. 13, the output voltage is controlled to be exactly 30V, and it is confirmed that the duty ratio of the switch operation is D = 0.435 and the link voltage V _link = 58 [V]. This result is similar to the result obtained when D = 0.5, calculated from the table of FIG.

The simulation result is shown in Fig. 14, where the final load resistance of the buck converter is set to R _o = 61.43 [ohm] so that the output power of 14.65 W can be outputted. As shown in FIG. 14, the output voltage is controlled to be exactly 30V, and the ratio of D = 0.319 and the link voltage V _link = 63.4 [V] can be confirmed at the time of the switch operation. This result is similar to the result obtained when D = 0.3, which is calculated from the table of FIG.

As described above, according to the present invention, the transformer is connected in parallel to the LCC resonance tank of the ballast to adjust the magnitude of the maximum power and the maximum power point, so that the ballast for illumination constituted by the LCC resonant inverter is replaced Stable driving can be realized when the LED driving device is coupled.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Power supply (power supply for lighting)
110: Inverter (ballast)
120: Converter
121: Transformer
122:
123:
124:

Claims (22)

delete delete delete delete delete delete delete delete A power supply for illumination which electrically connects with a ballast for supplying an AC power set in advance and converts the AC power into a DC power to drive the illuminator,
A transformer having an inductance forming a resonance tank with the ballast, the transformer receiving AC power converted by the resonance tank;
A rectifying unit for rectifying the AC power from the transformer;
A converting unit for switching a power source rectified by the rectifying unit to convert the power source into the direct current power source and supplying the direct current power source to the illuminator; And
Output power source application ratio when the level of the direct current power source is higher than the target power source level and increases the input / output power source application ratio when the power level of the direct current power source is lower than the target power source level,
And a power supply for lighting.
10. The method of claim 9,
Wherein the transformer forms an inductor-inductor-capacitor-capacitor (LLCC) resonant tank of the ballast.
10. The method of claim 9,
The control unit
Wherein the control unit compares the level of the direct current power source of the conversion unit with the target power level and decreases the switching duty of the conversion unit when the level of the direct current power source is higher than the target power level, Increases the switching duty of the converter if the current is lower than the target power level and maintains the switching duty of the converter if the power level of the DC power is equal to the target power level.
10. The method of claim 9,
Wherein the rectifying section includes a half-wave rectifying or current-carrying circuit.
13. The method of claim 12,
Wherein the rectifying part further comprises an LC (inductor-capacitor) filter or a C (capacitor) filter.
10. The method of claim 9,
Wherein the conversion unit is configured as one of an isolated conversion circuit and a non-conversion conversion circuit.
10. The method of claim 9,
Wherein the converting unit is one of a pressure reducing type converter, a step-up type converter, and a step-up / down type converter.
10. The method of claim 9,
Wherein the illuminator comprises at least one light emitting diode. A power supply for lighting for driving at least one light emitting diode by converting the AC power into a DC power by electrically connecting with a ballast installed in the building and supplying AC power previously set by an inductor-capacitor-capacitor (LCC) In the apparatus,
A transformer having an inductance forming an inductor-inductor-capacitor-capacitor (LLCC) resonant tank and receiving the AC power converted by the resonant tank;
A rectifying unit for rectifying the AC power from the transformer;
A converting unit for switching a power source rectified by the rectifying unit to convert the power source into the DC power source and supplying the DC power to the at least one light emitting diode; And
Output power source application ratio when the level of the direct current power source is higher than the target power source level and increases the input / output power source application ratio when the power level of the direct current power source is lower than the target power source level,
And a power supply for lighting.
18. The method of claim 17,
The control unit
Wherein the control unit compares the level of the direct current power source of the conversion unit with the target power level and decreases the switching duty of the conversion unit when the level of the direct current power source is higher than the target power level, Increases the switching duty of the converter if the current is lower than the target power level and maintains the switching duty of the converter if the power level of the DC power is equal to the target power level.
18. The method of claim 17,
Wherein the rectifying section includes a half-wave rectifying or current-carrying circuit.
20. The method of claim 19,
Wherein the rectifying part further comprises an LC (inductor-capacitor) filter or a C (capacitor) filter.
18. The method of claim 17,
Wherein the conversion unit is configured as one of an isolated conversion circuit and a non-conversion conversion circuit.
18. The method of claim 17,
Wherein the converting unit is one of a pressure reducing type converter, a step-up type converter, and a step-up / down type converter.

Images