JP2002078345A - Power factor correction apparatus with switching function, and power factor correction method using the apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power factor correction apparatus and a power factor correction method, which can detect automatically an inputted voltage, switch automatically the inductance of a power factor correction circuit according to the detected voltage value, and make the high-frequency voltage of an applicable product conform to the EN6100-3-2 Specifications or any other rocal environmental protection regulation. SOLUTION: This power factor correction apparatus comprises an inductor composed of at least two inductance elements; arranged symmetrically and connected to each other and an all-wave rectifier connected to the output end of the inductor, and a switching device which has its input end connected to a power supply input source, has its output end connected to the inductor, and selects a parallel connection or a series connection among the connection states of the two inductance elements, further, a power supply voltage detection device is included between the switching device and the power supply input source. The voltage of the power supply input source is detected by the power supply voltage detection device and supplied to the switching device as an electrical signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power factor correcting device having a switching function and a method thereof, and more particularly to a method of selecting a connection mode between inductances based on different input voltage values and automatically setting the connection mode. TECHNICAL FIELD The present invention relates to a power coefficient correction device capable of obtaining a total inductance value by selectively switching, and a method thereof.

[0002]

2. Description of the Related Art In addition to the rapid development of the electric industry in the modern era, awareness of environmental preservation has increased and environmental preservation standards of the electric industry have become indispensable. For this reason, agreements on various environmental conservation or safety regulations have also emerged one after another. The demand for the power supply and its design must also conform to the standards set by the International Electrotechnical Commission. For example, from January 1, 2001, in Europe, the E
The N61000-3-2 standard comes into effect. That is, any dedicated power supply, such as a television, a personal computer, and a monitor, which is an electric appliance whose power consumption is tens to several hundreds of watts, is EN61000-3-.
2 is within the scope of regulation. Therefore, EN61000-
In order to comply with the regulations regulated by the 3-2 standard, the industry has provided a kind of active power coefficient correction device in the power supply circuit. FIG. 1A discloses a known power supply active power factor correction circuit (PFC). As shown, the active power coefficient correction device 10 includes a control IC,
A bridge type rectifier (diodes D1, D2) composed of a transformer, a switching circuit, and elements such as diodes.
2, connected in series between 20 'and a wave filter capacitor C
A wave filter capacitor C in the power supply controls the high frequency generated during the charging procedure of the AC power supply.

[0003] By applying the correction device 10,
It is possible to obtain a preferable suppression effect on high frequency.
However, since the correction device 10 performs a switching operation under a high frequency, serious electromagnetic interference (EMI) is caused, which causes a problem of relatively causing interference to a monitor of other audiovisual equipment. In addition, since the PFC uses an IC chip to control the carrier, the manufacturing cost increases and it is difficult to reduce it. Therefore, the market lacks competitiveness and product availability, and a solution is awaited in this regard.

In order to solve the above problems, a kind of passive power coefficient correction circuit has been developed in the industry. As disclosed in FIG. 1B, at the input terminal L of the AC power source, (N)
And a bridge-type rectifier (constituted by diodes D1, D2, D3 and D4), an inductor Lm is connected in series, and a wave filter capacitor C in the power supply suppresses a high frequency generated during AC charging.

Although this type of passive configuration circuit can solve the above-mentioned drawbacks of the active correction circuit, the voltages provided by different nations or regions are not always the same between international countries. For example, it is 100 volts in Japan, but 230 volts in Europe. Therefore, when the product is sold to Japan, the inductor Lm1 suitable for the local voltage value must be used.
Also, when selling to Europe, an inductor Lm2 suitable for the local voltage value must be used. According to the experimental results, if the local voltage value is 100 volts as in Japan, the high frequency limit is EN.
The limit amount of the safety standard of 61000-3-2 is multiplied by 2.3 for conversion. Therefore, the limit is relatively relaxed. Therefore, only by using the inductor of 10 mH, it is suitable for the restriction by the local environmental protection and safety standard. In Europe, for example, 4
0mH inductor is local EN61000-3-2
Complies with standard restrictions. For this reason, if it can be designed to simultaneously comply with the agreement on the environmental conservation standards for voltage values in different countries and regions in the same device,
It can be used not only in countries that provide low voltage values, such as Japan, but also in areas that provide relatively high voltage values, such as Europe. However, in this case, there are difficulties in selecting and using the inductor. That is, providing a voltage value of 100 V requires a relatively large amount of electricity. Thus, inductors require windings with a wide cross section. In the 230V area, a relatively high inductance is required, so the inductor must have a large number of turns. However, if the coil is wound in this manner, the overall resistance becomes too high. If the coil is used in an area providing a voltage of 100 V, a serious problem of a voltage drop in the wave filter capacitor C occurs. . Thus, such inductors are not suitable in areas such as Japan that provide a voltage value of 100V. For this reason,
In the above-mentioned known technique, two types of inductors having different specifications must be present in the same device, and one of the inductors that is not selected for use is left without being used. This not only wastes resources, but also increases the volume, increases the space occupied by the device, and is a disadvantageous factor for product design.

Accordingly, a new solution and apparatus for the problems encountered in known power factor correction circuits is provided, wherein high frequency values are limited by converting to different inductors based on voltage inputs in different countries or regions. And at the same time how to achieve the purpose of suppressing the occurrence of electromagnetic interference and reducing the production cost? This is what the user has been waiting for and is the problem that the inventor seeks to solve.

[0007]

The present invention takes full advantage of the different variations of the symmetric arrangement of the inductances,
In other words, two opposing inductors are provided in the AC circuit for power supply, and the required inductance is achieved by switching the series or parallel connection state according to the difference in the input voltage value, thereby increasing the product's high frequency in Europe. It is an object of the present invention to provide a power coefficient correction device and a method thereof that can conform to the local EN6100-3-2 standard or other local environmental protection regulations.

According to the present invention, a voltage detecting element of a power supply is provided at an input terminal to automatically detect an input voltage value, and a power coefficient correction circuit accurately switches a connection state of an inductor to provide a local power supply. It is an object of the present invention to provide a power coefficient correction device and a method thereof that can achieve the purpose of automatically switching the inductance of a power coefficient correction circuit based on a voltage value to be performed.

Further, the present invention can be applied to different input voltages in each area simply by installing two corresponding inductors without providing inductors having different specifications as a set as in a known technique. It is another object of the present invention to provide a power coefficient correction apparatus and a method thereof that can reduce resource waste and manufacturing cost without taking up space in the apparatus.

[0010]

A power coefficient correction device according to the present invention includes an inductor and a switching element. Within the inductor, at least two corresponding inductances are symmetrically arranged and connected, and an all-wave rectifier is connected to the output of the inductor. The switching element has an input terminal connected to the power supply input source, an output terminal connected to the inductor, and selects the connection state of the two inductances from parallel or series by the switching element.

A power supply voltage detecting element is further provided between the switching element and the power supply input source. The power supply voltage detecting element detects a voltage value of the power supply input source, and electrically connects the switching element to the power supply input source. Provide a signal. The power supply voltage detecting element includes at least two resistors connected in series, and is connected to a constant voltage element (Zener diode) and a transistor in this order.

The switching element is a double pole type.
Switch, double pole doub
le throw) type relay.

The power coefficient correction method according to the present invention comprises:
It comprises the following steps a to c. In step a, the power supply voltage element detects the voltage of the input power supply, in step b, the switching element performs a switching operation based on the detected voltage of the power supply, and in step c, the switching operation is performed. Under the control of the element operation, at least two
The connection state of two inductances is selected from parallel or series.

Further, a set value relating to a voltage value inputted in advance is set by applying a constant voltage element, and a comparison is made as to whether the power supply voltage value is higher than the preset voltage value. When the voltage is higher than the set voltage value, the switching element brings the connection of the two inductances in the inductor into a series state, and when it is lower than the set voltage value, the switching element brings the connection of the two inductances in the inductor into a parallel state.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power coefficient correcting device according to the present invention includes an inductor and a switching element, in which at least two corresponding inductances are symmetrically arranged and connected, and An all-wave rectifier is connected to the output of the inductor.
The switching element has an input terminal connected to the power supply input source, an output terminal connected to the inductor, and selects the connection state of the two inductances from parallel or series by the switching element. A power supply voltage detection element is further provided between the switching element and the power supply input source, and the power supply voltage detection element detects a voltage value of the power supply input source to provide an electrical signal to the switching element. I do. The power supply voltage detecting element includes at least two resistors connected in series, and is connected in the order of a constant voltage element (Zener diode) and a transistor, and the switching element is a double pole double slow switch (switch, double pole double th
row) type relay. The power coefficient correcting apparatus and the power coefficient correcting method will be described in detail with reference to the drawings, showing the structure, features, and the like, using specific examples.

[0016]

First Embodiment A specific embodiment will be described to explain the features and effects of the present invention, and will be described in detail below with reference to the drawings. FIG. 2 shows a block diagram of a preferred embodiment of a power coefficient correcting device having a switching function according to the present invention. As shown, the power coefficient correction device 10 includes a power supply voltage detection element 12, a switching element 14, and an inductor 16. The power supply voltage detecting element 12 detects a voltage value of an AC power supply provided in the area where the device is used, and the switching element 14 is connected to an output terminal of the power supply voltage detecting element 12 and based on the voltage value obtained by the detection. An electrical change is generated to switch the connection by selecting from a connection configuration of at least two or more corresponding inductances in the inductor 16. The two inductances in the inductor 16 are coils having the same cross-sectional diameter and the same number of turns, and are disposed so that both sides facing the core are symmetrical (naturally, The inductance may be directly replaced by two independent inductors). Therefore, when the input AC power is converted into DC power by the power coefficient correction device 10 and the all-wave rectifier 20 and output, the inductance value generated by the power coefficient correction device 10 is determined by the input AC power. An appropriate change is made based on the voltage. Therefore, high frequency generated at the time of charging the AC power supply in the power supply can be suppressed.

Next, FIG. 3 discloses a flow chart when the power coefficient correcting method according to the preferred embodiment of the present invention is carried out. According to the drawing, when an AC power supply is input to the power coefficient correction device 10, in step 310, the power supply voltage element 12 detects the input power supply voltage, and
In step 0, the voltage value is 100 V or 230 V
Judge. If the voltage value is determined to be 100 V, 3
Proceeding to step 30, the switching element 14 switches the two inductances in the inductor 16 to a state of being connected in parallel. Therefore, if the inductance value of a single inductance is 20 mH, the two parallel inductance values are 10 mH, which can be applied to the region of Japan. However, if it is determined in step 320 that the input voltage is 230 V, the process proceeds to step 340 to switch to a state in which the two inductances in the inductor 16 are connected in series. Therefore, two inductances of 20 mH are similarly connected in series, and the inductance value becomes 40 mH. Therefore, it can be applied to the European region and the like. Then, in step 350, the DC power is finally output by receiving an all-wave rectification filter function of the all-wave rectifier 20.

FIG. 4 discloses a circuit of a power coefficient correction apparatus according to a preferred embodiment of the present invention. According to the illustration,
If you enter an AC power source to the input terminal L (N), the series resistance R ₁ which is provided inside the power supply detection圧素Ko _12, R --- _{2 -} the via for dividing effect, further constant voltage element (Zener diode) D _{Z The} input voltage is detected by the control of-. If when the input power supply voltage value (e.g. 230V) is higher than the preset voltage value to the constant voltage element D _Z (e.g. 150 V), is energized so, the transistor Q energized, electrical switching element 14 Inspired. The switching element 14 has a double pole, double throw,
It may be a switch (switch, double pole double throw) type relay or another switching switch. In a normal state, the point A and the point B are connected to each other, and the point D and the point E are set to form a connected circuit (a counterclockwise direction indicated by an arrow in the drawing). In other words, the two inductances Lm in the inductor 16 are set so as to form a parallel circuit. Therefore, when the inductance Lr is electrically triggered, the point B in the relay 14 changes its connection destination and connects to the point C, and the point E changes to the point F (clockwise direction indicated by the arrow in the figure). ). In this case, the two inductances L in the inductor 16
m is immediately connected in series. Therefore, the total inductance amount is 2 Lm, and the device can be used in a high-voltage power supply area such as a European area that outputs 230 V, for example. Further, a bridge type all-wave rectifier 20 (for example, a diode D
1, D2, D3, and D4) and receives the action of the all-wave rectifying filter of the wave filter capacitor C, and finally connects to a load device to output a DC power supply.

Since the two inductances Lm of the inductor 16 are set in parallel in advance, the total inductance is 1/2 Lm. That is, the preset input voltage value is 100 V, and in a country such as Japan that supplies a low voltage of 100 V, neither the constant voltage element _Dz nor the transistor Q is energized. For this reason, the inductance Lr does not change the connection state of the two inductances in the inductor 16 by switching the switching element 14 by generating an electric signal. Further, when the input voltage value is 100 V, the inductance connected in two parallel states divides the originally input current on average, so that a relatively thin wire can be used for the winding of the coil. The core having a relatively small volume can be selected. Therefore, the volume of the whole apparatus also becomes relatively small.

The two corresponding inductances provided in the inductor 16 according to the present invention are used in combination at 230 V or 100 V at the same time even under the circumstances, so that there are two unrelated elements as in the known art. There is no situation where an inductor is provided and one of them is selected and used, and the other is not used as it is. Therefore, it can be said that the technology according to the present invention has a competitive ability in the market regardless of both the size of the volume and the manufacturing cost.

[0021]

Second Embodiment FIG. 5 discloses a second embodiment of the present invention. According to the drawing, the power supply detecting element 1 of the present invention
The function 2 is replaced by a method in which the user determines the function by himself / herself and switches by the manual switching switch 54. That is, the user switches the manual switching switch 54 based on the voltage value of the power supply actually supplied in the area where the device is used.
To select the connection state of the circuit (B and E points and A and D points or C and F points). According to this method, the same effects and objects as those of the first embodiment can be achieved.

FIGS. 6A to 7D show a bar graph of the amount of high frequency generated before and after the power coefficient correction device according to the present invention is provided in the circuit, and a waveform diagram of the voltage / radio wave of the alternating current. FIG. 6A is a diagram showing a state where the supply voltage is 100 V and the power coefficient correction device is not provided. In the figure, the portion indicated by * is the high-frequency limit prescribed amount for the power supply supplied in the Japanese region.
The numerical values shown are the amounts of high frequencies actually measured and obtained.
As can be seen from the figures, all of them exceed the value of the safety regulation amount and do not conform to the safety regulation of environmental protection at all. FIG. 6B shows a waveform of the input AC voltage. The upper diagram shows the waveform of the input AC voltage, which depicts a perfect sine wave, while the lower diagram shows the waveform of the input AC current, whose peaks are prominent and concentrated,
It cannot be said that it is encoded in the voltage waveform. Therefore, the amount of generated high frequency is relatively large.
Similarly, in FIGS. 6c and 6D, the supplied voltage is 230 V (for example, in the European region), and the measurement is performed without the power coefficient correction device. In this case also, it does not conform to the EN 610003-2 standard.

FIGS. 7A and 7B show the results of measurement with a voltage of 100 V supplied in a region of Japan, for example, after the power coefficient correction device according to the present invention is provided.
As can be seen from the drawing, when the device according to the present invention is provided, up to the 39th high frequency, it is lower than the limited amount of the high frequency specified by the safety standard of the local environmental protection, and the input AC current The waveform of is also moderate and relatively matches the waveform of the input AC voltage. Therefore,
The suppression effect on the amount of high frequency generation is sufficiently clear.
7C and 7D, after the power coefficient correction device according to the present invention is provided in the circuit, the supply voltage value becomes 230V.
The results of experiments under conditions of (for example, the European region) are disclosed. Similarly, a result that perfectly matches the high frequency limit specified amount regulated by the EN610003-2 standard is shown. As a result of the above comparison, it can be proved that the effect of the power coefficient correcting device according to the present invention is clear.

The above description has been given of preferred embodiments of the present invention, and does not limit the scope of the present invention. Therefore, any change, modification, or the like having an equivalent effect on the shape, structure, feature, and spirit thereof described in the claims of the present invention shall be included in the claims of the present invention. .

[0025]

According to the power coefficient correcting apparatus and method according to the present invention, the power supply voltage value inputted
By automatically switching to switch the connection state of the two inductances provided in the inductor, the generated high frequency is reduced to EN6100-Europe.
3-2 Standards or other local environmental preservation regulations can be met, and as is known in the art, control of high frequency generation by replacing conductors with different specifications according to different power supply voltage values No need. In addition, it is possible to reduce the interference of electromagnetic waves and reduce the waste of resources and the manufacturing cost without occupying the space of the device.

[Brief description of the drawings]

FIG. 1A is a circuit diagram of a known active power coefficient correction device.

FIG. 1B is a circuit diagram of a known passive power coefficient correction device.

FIG. 2 is a block diagram showing a structure of a power coefficient correction device according to the present invention.

FIG. 3 is a flowchart showing steps of a power coefficient correction method according to the present invention.

FIG. 4 is a circuit diagram of a power coefficient correction device according to the present invention.

FIG. 5 shows a second embodiment of the power coefficient correction device according to the present invention.
It is a circuit diagram of an example.

6A and 6B are a graph showing a high frequency of an alternating current (100 V) measured without providing a power coefficient correcting device according to the present invention, and a waveform diagram of an alternating voltage / current.

6C and 6D are a graph showing a high frequency of an alternating current (230 V) measured without providing a power coefficient correcting device according to the present invention, and a waveform diagram of an alternating voltage / current.

7A and 7B are a graph showing a high frequency of an alternating current (100 V) measured in a state where the power coefficient correcting device according to the present invention is provided, and a waveform diagram of an alternating current / current.

7C and 7D are a graph showing a high frequency of an AC current (230 V) measured in a state where the power coefficient correction device according to the present invention is provided, and a waveform diagram of an AC voltage / current.

[Explanation of symbols]

 Reference Signs List 10 'power coefficient correction device 10 power coefficient correction device 12 power supply voltage detecting element 14 switching element 16 inductor 20' all-wave rectifier 20 all-wave rectifier 54 manual switching switch

Claims (11)

[Claims] 1. A power coefficient correction device including an inductor and a switching element, wherein at least two corresponding inductances are symmetrically arranged and connected in the inductor, and connected to an output terminal of the inductor. Connecting an all-wave rectifier, the switching element having an input terminal connected to a power input source,
The power coefficient correcting device according to claim 1, wherein the output terminal is connected to the inductor, and the connection state of the two inductances is selected from parallel or series by the switching element. . 2. When the voltage of the power supply input source is higher than a preset voltage value, the inductance in the inductor exhibits a serial connection state, and when the voltage of the power supply input source is lower than the preset voltage value, the parallel connection is established. The power coefficient correction device according to claim 1, wherein the power coefficient correction device has a switching function. 3. A power supply voltage detecting element is further provided between the switching element and the power supply input source, and a voltage value of the power supply input source is detected by the power supply voltage detection element, and the switching element is electrically connected. The power factor correction device with switching function according to claim 1, characterized in that it provides a signal. 4. The power supply voltage detection element includes at least two resistors connected in series, and is connected in order of a constant voltage element (Zener diode) and a transistor, and a voltage of a power supply input source is set in advance. 4. The power coefficient correcting device having a switching function according to claim 3, wherein an electric signal is generated by the operation of the constant voltage element and the transistor when the voltage value is higher than the set voltage value. 5. The switching device according to claim 1, wherein the switching element is a double pole double throw switch.
2. The power coefficient correction device having a switching function according to claim 1, wherein the power coefficient correction device is a relay of a double throw) type. 6. The power coefficient correcting device having a switching function according to claim 1, wherein the switching element is a manual switch. 7. The power factor correction device with switching function according to claim 1, wherein the inductor is directly replaced by two independent inductors. 8. A power coefficient correction method including a switching operation, the power coefficient correction method including the following steps a to c: in step a, the power supply voltage element inputs the power supply voltage to be input. In step b, the switching element performs a switching operation based on the detected voltage of the power supply, and in step c, the switching element operates under the control of the switching element operation to obtain at least two inductances in the inductor. A power coefficient correction method for a power coefficient correction apparatus having a switching function, wherein a connection state is selected from parallel or series. 9. The power factor correction with a switching function according to claim 8, wherein the detection of the power supply voltage in the step a) automatically detects a voltage input by a power supply voltage detection element. How to modify the power coefficient of the device. 10. The apparatus according to claim 8, wherein in the step (a), the user judges the input voltage, and in the step (b), the switching element is manually switched. A power coefficient correction method for a power coefficient correction device having a switching function. 11. The steps (b) and (c) include setting a voltage set value in advance using a constant voltage element, comparing whether the power supply voltage value is higher than the set value, and setting the power supply voltage value. If the voltage value is higher than the voltage value, the switching element puts the connection of the two inductances in the inductor in series,
9. The method according to claim 8, wherein when the power supply voltage value is lower than the set value, the switching element sets a connection of two inductances in the inductor in a parallel state.
A power coefficient correction method for a power coefficient correction apparatus having a switching function according to claim 1.