RU172707U1 - CURRENT STABILIZATION DEVICE WITH ACTIVE POWER CORRECTOR CORRECTOR - Google Patents

Abstract

The utility model relates to devices of pulsed converting equipment, in particular to devices for stabilizing current and adjusting power factor in converters. The technical result of the utility model is to simplify the design of the device. The current stabilization device with an active power factor corrector contains a controlled electronic switch 1, a control circuit 2, a bridge rectifier 3, a first diode 4, a first inductor 5, a first capacitor 6, a second diode 7, a third diode 8, a second inductor 9, a second capacitor 10 for connection with a load of 11. 1 n.p. f-ly, 4 z.p. f-ly 3 ill.

Description

The utility model relates to devices of pulsed converting equipment, in particular to devices for stabilizing current and adjusting power factor in converters.

Known power factor corrector from patent RU 2571952 C1 (publ. 27.12.2015). The power factor corrector contains an input rectifier, a transistor with a control system, an inductor, a capacitor and a diode connected to the transistor.

The closest analogue of the claimed utility model is the technical solution described in the text of patent RU 2479955 C2 (publ. 04/20/2013), containing a switching power supply to provide power factor correction and supply the output voltage to one light source by controlling a single key, light control AC to change the input voltage.

However, this solution is designed to work with light-emitting diodes and has a different circuit solution.

The technical problem to which the claimed utility model is directed is the non-compliance with the norms of the Technical Regulations of the Customs Union on electromagnetic compatibility.

The technical result of the utility model is to simplify the design of the device without loss of quality.

The specified technical result is achieved due to the fact that the current stabilization device with an active power factor corrector contains a controlled electronic switch, a control circuit, a bridge rectifier, a first diode, a first inductor, a first capacitor, a second diode, a third diode, a second inductor and a second a capacitor, while the bridge rectifier is connected to the first diode, the first inductor and the first capacitor and through the first inductor with a controlled electron th key to the control circuit, which are connected with connection of the second diode, the third diode, the second inductor and the second capacitor.

As a controlled electronic key, a field effect transistor, a bipolar transistor, an insulated gate bipolar transistor, or a thyristor can be used.

Thanks to the combination of a current stabilizer and a power factor corrector with common controls based on a controlled electronic key with a control circuit, the number of elements is reduced, which provides structural simplification of the circuit.

The inventive utility model is illustrated using FIG. 1-3, which depict:

FIG. 1 is a first example implementation of a device;

FIG. 2 - the second example of the implementation of the device;

FIG. 3 - diagrams of the operation of the device.

In FIG. 1-2 positions 1-11 are indicated:

1 - controlled electronic key;

2 - control circuit;

3 - bridge rectifier;

4 - the first diode;

5 - the first inductor

6 - the first capacitor;

7 - second diode;

8 - the third diode;

9 - the second inductor;

10 - second capacitor;

11 - load.

The current stabilization device with an active power factor corrector contains a controlled electronic switch 1, a control circuit 2, a bridge rectifier 3, a first diode 4, a first inductor 5, a first capacitor 6, a second diode 7, a third diode 8, a second inductor 9, a second capacitor 10 to connect to the load 11.

As a controlled electronic key 1, a field effect transistor, a bipolar transistor, an insulated gate bipolar transistor, or a thyristor can be used.

The bridge rectifier 3 is connected to the first diode 4 connected to the first inductor 5 and the first capacitor 6 and through the first inductor 5 with a controlled electronic key 1 to the control circuit 2. The latter are connected to the connected second diode 7, the third diode 8, the second inductor 9 and a second capacitor 10 to which the load 11 is connected.

The connected bridge rectifier 3 with the first diode 4 connected, the first inductor 5 and the first capacitor 6 is an active power factor corrector (ACCM) assembly. The connected second diode 7, the third diode 8, the second inductor 9 and the second capacitor 10, to which the load 11 is connected in parallel, are a current stabilizer (CT). The combined AKKM and ST have one power key in the form of a controlled electronic key 1 and one control circuit 2, which are common to both AKKM and ST.

The device operates as follows.

The current stabilizer operates as follows.

When the controlled electronic switch 1 closes, the current increases linearly through the second inductor 9 along the contour of the first capacitor 6, the controlled electronic switch 1, the second capacitor 10, load 11, the second inductor 9, the first capacitor 6. When the current reaches the instantaneous value equal to double value stabilized load current, the controlled electronic switch 1 opens. The current through the second inductor 9 begins to linearly decrease along the circuit of the second inductor 9, the third diode 8, the second capacitor 10, the load 11, the second inductor 9. When the instantaneous current decreases to zero, the controlled electronic switch 1 closes again and the period repeats. Thus, the average value of the load current has a constant value. The second capacitor 10 is a smoothing capacitive filter of the load current. The pulse duration of the control voltage of the controlled electronic switch 1 depends on the voltage level on the first capacitor 6. The lower the voltage on the first capacitor 6, the longer the pulses and vice versa. The pause between pulses has a constant duration.

AKKM works as follows.

When the controlled electronic switch 1 closes, the current also increases linearly through the first inductor 5 along the circuit of the bridge rectifier 3, the first inductance 5, the controlled electronic switch 1, the bridge rectifier 3. When the controlled electronic switch 1 opens, the current decreases linearly through the first inductor 5 along the contour of the first inductor 5, the first capacitor 6, the first diode 4, the first inductor 5.

AKKM is built on the basis of the ratio of voltage and current in the inductive element, namely, that the rate of change of current through the inductor is proportional to the voltage applied to it. Thus, it turns out that if the duration and period of the voltage pulses applied to the inductor are constant, and the current through the inductor at the start of the pulse is zero, then the average value of the current through the inductor for the period of the pulse will be proportional to the amplitude value of the voltage pulse to the inductor. The period of the voltage pulse applied to the inductor consists of two time intervals: the interval of the pulse when the inductive element accumulates energy and the interval of the pause when the inductive element gives off energy.

In this circuit, when the controlled electronic switch 1 is closed, the mains voltage is applied to the first inductor 5, and the current flowing through the first inductor 5 in the pulse interval is the current consumed from the mains. Thus, it turns out that if the controlled electronic switch 1 is controlled by high-frequency voltage pulses of equal length and constant period (not more than 500 μs), then the average value of the current consumed from the network during the pulse period will be proportional to the instantaneous value of the network voltage.

Equally in duration pulses and a constant period of control voltage of the controlled electronic switch 1 are provided if the voltage at the first capacitor 6 is constant in steady state at a certain effective value of the mains voltage.

In the interval of a pause, the current passing through the first inductor 5 charges the first capacitor 6. If its capacitance is large enough, then the voltage across it will be quite constant throughout the entire period of the mains voltage.

To comply with the zero current condition through the first inductor 5 by the time the beginning of the period, it is necessary that the current through the first inductor 5 ends before the current ceases through the second inductor 9.

Feedback between AKKM and ST regulates the consumption of the required amount of energy from the power supply by changing the duration of the voltage pulses controlling the controlled electronic key 1. If the mains voltage decreases in its effective value, this leads to a decrease in the voltage on the first capacitor 6 and, accordingly, to an increase in pulse duration and an increase in mains current consumption. If the mains voltage increases in its effective value, then this leads accordingly to an increase in voltage at the first capacitor 6, to a decrease in the pulse duration and to a decrease in the consumption of the mains current.

Accordingly, in the inventive device, the current consumed from the power supply will be proportional to the mains voltage and will have a sinusoidal shape.

Management and opening / closing of the controlled electronic key 1 is carried out by the control circuit 2.

Without the second diode 7 in the interval of a pause in some operating modes of the device, uncontrolled charging of the first capacitor 6 by mains voltage through the first inductor 5 and through the third diode 8 can occur, which can lead to incorrect operation of the device.

In FIG. 3 I ₃ shows the change in current of the bridge rectifier 3, I _{BX AVG} - change in the average value of the consumed mains current, I _{BX peak} - the envelope of the maximum current values of the bridge rectifier 3, I ₅ - change in the current in the first inductor 5, I ₄ - change in current in the first diode 4, U ₆ is the voltage change at the first capacitor 6, U ₁ is the change in the gate control voltage of the field effect transistor 1, I ₉ is the current change in the second inductor 9, I ₁₁ is the load current change, U ₁₀ is the current change in second capacitor 10.

The given examples of the utility model are special cases and do not exhaust all possible implementations of the utility model.

A person skilled in the art will understand that adding new circuit elements without changing the concept does not change the proposed device, but only expands its functionality.

Claims (5)

1. A current stabilization device with an active power factor corrector, characterized in that it contains a controlled electronic switch, a control circuit, a bridge rectifier, a first diode, a first inductor, a first capacitor, a second diode, a third diode, a second inductor and a second capacitor, with this bridge rectifier is connected to the connected first diode, the first inductor and the first capacitor and through the first inductor with a controlled electronic key with a control circuit, to torye connected with connected second diode, third diode, the second inductor and the second capacitor. 2. A current stabilization device with an active power factor corrector according to claim 1, characterized in that a field-effect transistor is used as a controlled electronic key. 3. A current stabilization device with an active power factor corrector according to claim 1, characterized in that a bipolar transistor is used as a controlled electronic key. 4. The current stabilization device with an active power factor corrector according to claim 1, characterized in that a bipolar transistor with an insulated gate is used as a controlled electronic switch. 5. A current stabilization device with an active power factor corrector according to claim 1, characterized in that a thyristor is used as a controlled electronic key.

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