KR100679322B1 - Power supply with direct conversion switching - Google Patents

Abstract

In constructing a power supply device for converting AC power into DC by interrupting the AC power by a high speed switching method, the device is configured so that the magnitude of the force output is the same by varying the conduction time and the interruption time of the AC power, thereby improving the conversion efficiency of the power. A power supply using direct conversion switching for augmentation is disclosed. The present invention has a relatively long conduction time and a short interruption time in a phase with a low voltage level of a full-wave rectified AC power, and operates a relatively short conduction time and a long interruption time in a phase with a high voltage level of an AC power source. By adjusting the conduction time and intermittent time of AC power, the pass power is configured equally to increase the conversion efficiency of power and operate in series with the load, that is, configure the device so that it does not operate under no load. Significantly reduce power consumption.

Description

Power supply using direct switching

1 is a waveform diagram for explaining the operation of the power supply apparatus according to the present invention.

2 is a block diagram illustrating a configuration of a power supply apparatus according to an embodiment of the present invention.

3 is a block diagram illustrating a configuration of a power supply apparatus according to another embodiment of the present invention.

4 is a circuit diagram showing the detailed configuration of the power supply of the present invention.

<Description of the symbols for the main parts of the drawings>

110: rectifier 120: power level detection and switching control

130: switching unit 140: overvoltage detection unit

150: overcurrent detection unit 160: feedback control unit

The present invention relates to a power supply using a direct conversion switching, in particular in the configuration of a power supply for converting the AC power to a direct current by interrupting the AC power in a high-speed switching method, the output force by varying the conduction time and the interruption time of the AC power The present invention relates to a power supply using direct conversion switching for increasing the conversion efficiency of a power source by configuring the device so that the size of the same is the same.

In general, there are two main methods of supplying DC power using AC power. The first method is a widely used method for supplying a small DC power supply, and a transformer (hereinafter referred to as a transformer) is used to convert the AC power to a DC by lowering the voltage. The second method is to control the width of DC power by converting the commercial AC power to DC and then switching the conduction time of the converted DC power.

The method of using a transformer has been widely used because of its relatively simple device, which is easy to manufacture and economical, but has a disadvantage of low power supply efficiency and high power consumption at no load standby.

The method of converting the commercial AC power to DC and then switching the conduction time of DC power has the advantage of providing higher efficiency and less equipment size than using transformer, but to supply 10% of AC power. For example, since power is controlled by turning on one cycle and turning off the remaining nine cycles in a total of 10 cycles, economical efficiency is low, and power consumption is large at no load standby.

The present invention has been invented to solve the above shortcomings, and in constructing a power supply device for converting AC power into a direct current by interrupting the AC power by a high speed switching method, the conduction time and the interruption time of the AC power are configured equally. The purpose of the present invention is to provide a power supply apparatus using direct conversion switching which increases conversion efficiency and operates in conjunction with a load, that is, does not operate under no load, thereby significantly reducing power consumption during no load standby. There is this.

The present invention for performing the above object,

Rectifying unit 110 composed of bridge diodes (D1 ~ D4) for full-wave rectification of AC power;

The rectifier 110 operates as a rectified power source, detects a power level of a sinusoidal waveform of an input AC power source, allows a relatively long time to be conducted while the power level is low according to the detected power level, and has a large power level. A power level detection and switching control unit 120 for controlling the switching so that only a short time is conducted during the operation;

A switching unit (130) connected to an output terminal of the power level detection and switching control unit (120) for switching a conduction time of an AC power source to several hundred Hz according to the output signal of the power level detection and switching control unit (120);

The overvoltage detector 140 detects whether the power output through the output terminal is an overvoltage by the operation of the switching unit 130 and outputs a signal for stopping the supply of power to the switching unit 130 when the overvoltage is detected. );

The overcurrent detector 150 detects whether the power output through the output terminal is an overcurrent by the operation of the switching unit 130 and outputs a signal to stop the supply of power to the switching unit 130 when the overcurrent is detected. ); And

When the overcurrent and overvoltage are connected to the switching unit 130 to feedback the output signal of the overcurrent detecting unit 160 to the switching unit 130, the operation of the switching unit 130 is controlled to always maintain a constant current. It includes a feedback control unit 160 for outputting.

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

1 is a waveform diagram for explaining the operation of the power supply device according to the present invention, Figure 2 is a block diagram for explaining the configuration of the power supply device according to the present invention, Figure 3 is another embodiment of the present invention 4 is a block diagram illustrating a configuration of a power supply device according to an example, and FIG. 4 is a circuit diagram showing a detailed configuration of a power supply device of the present invention.

In the power control method according to the present invention, as shown in FIG. 2, a power supply for intermittently converting into a direct current by fast switching in positive and negative negative waves of a sinusoidal waveform of an AC power source is input. In constructing the device, the conduction time and the interruption time of the AC power source are configured to be the same, thereby increasing the conversion efficiency of the power source.

As shown in FIG. 3, the power control apparatus according to the present invention operates as a rectified power in the rectifying unit 110 including bridge diodes D1 to D4 for full-wave rectifying AC power, and a sine wave of an AC power input. The power level detection and switching control unit 120 for detecting the power level of the waveform and controlling the switching so that a relatively long time is conducted while the power level is low according to the detected power level, and conducting only a short time while the power level is high. ) Is formed. A switching unit 130 is formed at the output terminal of the power level detection and switching controller 120 to switch the conduction time of the AC power to several hundred Hz according to the output signal of the switching controller 120.

When the DC power is output by the operation of the switching unit 130, in order to control the operation of the switching unit 130, the present invention detects the voltage of the DC power output to the load connected to the DC current output terminal and overvoltages. When detected, an overvoltage detector 140 for outputting a signal according to the detection and a current of the DC power output to the load are detected. If an overcurrent is detected, an overcurrent detector 150 for outputting a signal accordingly is formed.

The overvoltage detection unit 140 and the overcurrent detection unit 160 are connected to the switching unit 130 through the feedback control unit 160 to control the operation of the switching unit 130 when an overcurrent and overvoltage are generated so that a constant current is always output. do.

In addition, the power supply apparatus according to the present invention can control the AC power supplied to the load by short-circuit the DC current output terminal as shown in Figure 3 and connecting the load to one of the commercial AC power input terminal in series. That is, in the embodiment of FIG. 3, unlike the embodiment of FIG. 2, the voltage level of the AC power supplied to the load is adjusted. In the high voltage level, the operation is performed to have a relatively short conduction time and a long interruption time. By constructing the same passing power, the conversion efficiency of the power source is increased.

The power supply device according to the present invention can be implemented as a circuit as shown in Figure 4, the rectifier 110 is composed of bridge diodes (D1 ~ D4) so that the commercial AC power applied to full-wave rectification. The power supply level and the switching control unit 120 are connected to the inside of the rectifying unit 110 including the bridge diodes D1 to D4. In the power supply level and the switching controller 120, a resistor R1 and a zener diode ZD1 are connected in series to the rectifier 110 including the bridge diodes D1 to D4, and the zener diode ZD1 is a capacitor C1. Is connected in parallel. The Zener diode ZD1 and the capacitor C1 connected in parallel serve to prevent abnormal power in the full-wave rectified AC power supply. In addition, the resistor R2 and the variable resistor VR1 are connected in series with the rectifier 110, and the capacitor C2 is connected to the cathode terminal of the diode D11 connected with the variable resistor VR1 to R * C. And to determine a switching period by an integer.

Another variable resistor VR2 is connected to one side of the capacitor C2, and the variable resistor VR2 inputs a control signal to the timer 132 of the switching unit 130 through the diode D12. It is composed.

The switching unit 130 operates according to the power level and the signal of the resistor R1 of the switching controller 120, and R * determined by the power level and the resistors R2 and VR2 and the capacitor C2 of the switching controller 120. According to the C constant, the variable resistor VR2 receives the control signal through the diode D12 and outputs the output signals of the timer 132 and the timer 132 that are operated by the resistor R3 and the diode D13 to the base end. It is composed of a first transistor (Q1) to receive the switching operation, the base terminal is connected to the collector terminal of the first transistor (Q1) and the full-wave rectified power from the rectifier (D1 ~ D4) to the resistor (R4, R5) The base terminal is connected to the emitter terminal of the second transistor (Q2) and the second transistor (Q2) through the resistor (R6) to receive the input to the collector terminal through the switching transistor and consists of a switching transistor (Q3). . The base terminal of the fourth transistor Q4 is connected to the collector terminal of the third transistor Q3 through the resistor R4. The fourth transistor Q4 suspends the full-wave rectified power from the rectifiers D1 to D4. It is input to the emitter stage through the turn (L), it is formed so that the output terminal is connected to the collector stage.

At this time, a capacitor C3 for smoothing is connected to the output terminal of the power supply device according to the present invention. The capacitor C3 for smoothing is connected between the output terminals, and since the capacitor C3 is connected in series with the switching unit 130, there is no load in the output terminal, that is, if there is no power consumption, the power supply device according to the present invention does not operate. No-load can reduce power consumption.

In addition, an overcurrent detection unit 150 is formed at the collector end of the fourth transistor Q4 of the switching unit 130, and an overvoltage detection unit 140 is formed at the inductance L of the switching unit 130. The overvoltage detector 140 has a base terminal connected to the inductance L of the switching unit 130 through the variable resistor VR3 and a collector terminal connected to the base terminal of the fourth transistor Q4. Q5), and the overcurrent detecting unit 150 includes resistors R8 and R9 connected in series to the collector terminal of the fourth transistor Q4 of the switching unit 130 and the variable resistor VR4 connected to the resistor R9. It consists of.

The feedback controller 160 includes a base terminal connected to one side of the variable resistor VR4 through a resistor R10, and a collector terminal including a sixth transistor Q6 connected to the base terminal of the third transistor Q3. do.

When the load is connected to the output terminal of the power supply according to the present invention configured as described above and commercial AC power is applied, the applied AC power is full-wave rectified through the bridge diodes D1 to D4 of the rectifier 110. The rectified wave power is applied to the base terminal of the second transistor Q2 through the resistor R4 and the resistor R5 of the switching unit 130 and is supplied to the timer 132 through the resistor R1. The capacitor C2 is filled through the other resistor R2 and the variable resistor VR1.

Since the rectified power is applied to the base terminal of the second transistor Q2 through the resistor R4 and the resistor R5 of the switching unit 130, the second transistor Q2 is turned on. The power is input to the base terminal of the third transistor Q2 through R6, and the third transistor Q3 is also turned on. As a result, the fourth transistor Q4 is also turned on, so that the bridge diodes D1 to the rectifier 110 are turned on. The full-wave rectified power through D4) is rippled through the inductance (L) and smoothed by the capacitor (C3) formed between the output terminal of the power supply is supplied to the load. Therefore, as shown in Figure 1, the power supply has a constant conduction time.

Here, in the power supply apparatus according to the present invention, since the output terminal is connected in series with the switching unit 130, there is no load on the output terminal, that is, if there is no power consumption, the power supply apparatus according to the present invention is not operated, so Reduced consumption

In addition, when the fixed wave rectified power charged to the capacitor C2 is supplied through the resistor R2 and the variable resistor VR1 for a predetermined time, and the capacitor is charged with a predetermined amount or more, the timer 132 is provided through the variable resistor VR2. The control signal is output to the timer, and the timer 132 outputs a signal for turning on the first transistor Q1 through the resistor R3 and the diode D13.

When the first transistor Q1 is turned on, the power applied to the base terminal of the second transistor Q2 is output to the emitter terminal of the first transistor Q1 so that the second transistor Q2 is turned off and the third transistor ( Q3) is also turned off, so that the fourth transistor Q4 is also turned off so that ripple is removed through the inductance L and smoothed by the capacitor C3 formed between the output terminals of the power supply and supplied to the load. As the power supply is stopped, as shown in FIG. 1, the power supply device has a pause time. After the power supply of the power supply is stopped and the capacitor C2 is discharged, the power supply operation is repeated again. In the present invention, as shown in FIG. 1, the conduction time and the interruption time of the AC power supply are the same. In the low voltage level of the AC power supplying the wave current, the charge and discharge time of the capacitor is long because the amount of charge charged in the capacitor C2 is low, so that it has a relatively long time and interruption time. At this high voltage level, the charging and discharging time of the capacitor is shortened, so that the short time and interruption time are relatively short.

In addition, in the power supply device according to the present invention, the feedback controller (B) according to the output signal of the overvoltage detector 140 and the overcurrent detector 150 for detecting an overcurrent or an overvoltage in the power supplied to the load through the output terminal. In operation 160, the power supply is cut off.

First, referring to the operation of the overvoltage detector 140, when overvoltage is detected through the variable resistor VR3 connected to the inductance L of the switching unit 130 while power is supplied to the load, the fifth transistor Q5. ) Is turned on and the full-wave rectified power is induced to the capacitor C1 of the switching controller 120 through the turned-on third transistor Q3, and accordingly the control signal to the timer 132 through the variable resistor VR2. Is output, and the timer 132 outputs a signal for turning on the first transistor Q1 through the resistor R3 and the diode D13, thereby stopping the supply of power supplied to the load.

Similarly, the overcurrent detector 150 is adapted to the operation of the resistors R8 and R9 connected in series to the collector terminal of the fourth transistor Q4 of the switching unit 130 and the variable resistor VR4 connected to the resistor R9. When the overcurrent is detected, the sixth transistor Q6 is turned on and induced in the capacitor C1 of the switching controller 120 through the second transistor Q2 in which the full-wave rectified power is turned on. The control signal is output to the timer 132 through the VR2, and the timer 132 outputs a signal for turning on the first transistor Q1 through the resistor R3 and the diode D13. The supply is stopped.

As described above, the power supply device according to the present invention has a relatively long conduction time and a short interruption time in a phase where the voltage level of the full-wave rectified AC power is low, and conducts a relatively short time in a phase where the AC power voltage level is high. It operates to have time and long interruption time, so that the passing power is configured by adjusting the conduction time and interruption time of AC power to increase the conversion efficiency of power, and to operate in conjunction with the load, that is to prevent operation under no load. The device is configured to significantly reduce power consumption during no-load standby.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited thereto and may be improved or modified by those skilled in the art within the scope of the technical idea of the present invention .

Claims (6)

Rectifying unit 110 composed of bridge diodes (D1 ~ D4) for full-wave rectification of AC power; The resistor R1 and the zener diode ZD1 are connected in series with the rectifier 110, and the zener diode ZD1 is connected in parallel with the capacitor C1 to prevent abnormal power in the AC power. The resistor R2 and the variable resistor VR1 are connected in series with the rectifier 110, and a switching period is determined at the cathode terminal of the diode D11 connected to the variable resistor VR1. A capacitor (C2) is connected, a variable resistor (VR2) is connected to one side of the capacitor (C2), the variable resistor (VR2) is configured to output a control signal through the diode (D12) AC input Power level detection and switching to detect the power level of the sine wave waveform of the power supply, to allow relatively long time to be conducted while the power level is low according to the detected power level, and to control switching so that only a short time is conducted while the power level is large. My Fisherman 120; A timer for switching operation by receiving a control signal according to a switching period determined by the resistors R2 and VR2 and the capacitor C2 of the power level detection and switching controller 120 through a variable resistor VR2 and a diode D12 ( 132 and the output signal of the timer 132 is input to the base terminal through the resistor (R3) and diode (D13) for switching operation based on the first transistor (Q1), the collector terminal of the first transistor (Q1) base A second transistor Q2 and an emitter terminal of the second transistor Q2 are connected to each other and connected to the collector terminal through the resistors R4 and R5 to receive the electric power rectified by the rectifiers D1 to D4. The base terminal is connected to the third terminal Q3 and the collector terminal of the third transistor Q3 is connected to the base terminal through the resistor R6, and the base terminal is connected to the collector terminal of the third transistor Q3 through the resistor R4. In step D4) A switching unit 130 configured to receive an input to the emitter terminal through the turn L, and comprise a fourth transistor Q4 configured to connect an output terminal to the collector terminal to switch the conduction time of the AC power source to several hundred Hz; The overvoltage detector 140 detects whether the power output through the output terminal is an overvoltage by the operation of the switching unit 130 and outputs a signal for stopping the supply of power to the switching unit 130 when the overvoltage is detected. ); The overcurrent detector 150 detects whether the power output through the output terminal is an overcurrent by the operation of the switching unit 130 and outputs a signal to stop the supply of power to the switching unit 130 when the overcurrent is detected. ); And When the overcurrent and overvoltage are connected to the switching unit 130 to feedback the output signal of the overcurrent detecting unit 160 to the switching unit 130, the operation of the switching unit 130 is controlled to always maintain a constant current. Power supply using a direct conversion switching comprising a feedback control unit 160 for outputting. delete delete According to claim 1, wherein the output terminal includes a capacitor (C3) for smoothing, the power supply using a direct conversion switching, characterized in that connected to the switching unit 130 in series to cut off the power supply when there is no load Feeder. 2. The power supply using direct conversion switching according to claim 1, wherein the output terminal of the power supply is shorted and a load is connected to one of commercial AC power input terminals in series so as to perform power control of the AC power. Feeder. 2. The base terminal of claim 1, wherein a base end of the overvoltage detector 140 is connected to an inductance L of the switching unit 130 through a variable resistor VR3, and a collector end of the fourth terminal Q4. The overcurrent detector 150 includes resistors R8 and R9 connected in series to the collector terminal of the fourth transistor Q4 of the switching unit 130 and the resistor R9. ) Is configured as a variable resistor (VR4) connected to the feedback control unit 160, the base terminal is connected to one side of the variable resistor (VR4) through a resistor (R10), the collector terminal of the third transistor (Q3) A power supply using direct conversion switching, characterized in that consisting of a sixth transistor (Q6) connected to the base end.

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