WO2006019328A1 - Boost pulse-type voltage regulator with continuous output current - Google Patents

Abstract

The inventive boost pulse-type voltage regulator with continuous output current relates to electrotechnical engineering, in particular to DC / DC converters. Said invention makes it possible to reduce output voltage ripple. For this purpose, the boost pulse-type voltage regulator comprises input (1), common (2) and output (3) terminals for connecting a power supply (4) and a load (5) thereto, respectively, a throttle (6), a diode (7), a filtering capacitor (8), a monitoring key (9) provided with a control circuit (10), an additional current transformer (11), a second (12) and third (13) diodes. Therefore, a current for charging the filtering capacitor (8) flows when the monitoring key (9) is open or closed, thereby reducing the voltage ripple on the load (5). When the numbers of primary and secondary turns of the current transformer (11) are equal, the output current of the boost pulse-type voltage regulator is practically equal to the throttle (6) current and the voltage ripple on the load (5) can be insignificant event in the absence of the filtering capacitor (8).

Description

 PULSE BOOST VOLTAGE REGULATOR WITH CONTINUOUS OUTPUT

Technical field

The invention relates to the field of electrical engineering, in particular to DC-DC converters, and can be used in secondary power sources.

State of the art

Switching step-up voltage regulators are used when it is necessary to obtain a voltage on the load that is larger than the input voltage. Each period of operation of the pulse boost voltage regulator can be divided into two time intervals: in the first, energy is accumulated in the inductor, in the second, the accumulated energy is transferred to the load. Because Since the output current of the pulse raising voltage regulator is pulse, then to obtain a stable voltage at the load, the use of a large-capacity filter capacitor connected in parallel with the load is required. To date, this drawback is inherent in all switching voltage boosting regulators (Ricardo Fueptes, Ratisio Lagos, Juapustos. And Yghfficuppuoptuopropase passoptolued bu resonant IGBT iperpert. EPE 2001, 2001,.

Known pulse boost voltage regulator containing input, common and output terminals for connecting a power source and a load, a choke, one output connected to an input output, another output through a diode to an output output, a controlled key, one output connected to a common output, a second output connected to the connection point of the inductor and diode, and the control output to the output of the source of control signals, a filtering capacitor connected between the common and output terminals (Sources of secondary about power supply. CC. Bukreev, V.A. Golovatsky, G.N. Gulyakovich et al. Ed. Yu.I. Koneva. M., Radio and Communications, 1983, cf. 80).

When the controlled key is closed, the voltage of the power source is applied to the inductor and the current in the inductor increases, when the controlled key is open, the diode opens and the inductor current closes through the load, the filter capacitor and the power supply, while the input and output voltage difference is applied to the inductor and the current in the inductor decreases .

The disadvantage of this pulse boost voltage regulator is the large ripple of the output voltage, because The filter capacitor is recharged only when the controlled key is open.

The best solution to this problem would be the formation of a continuous charging current of the filter capacitor. The problem solved by the invention is the creation of a pulsed step-up voltage regulator with a continuous output current, in which the ripple of the output voltage is achieved by recharging the filter capacitor with both open and closed controlled key.

Disclosure of invention

The problem is solved due to the fact that in a known pulse raising voltage regulator containing input, common and output terminals for connecting a power supply and load, respectively, a choke connected to the input terminal by one output, and a filter capacitor through the first diode to the output terminal included between the common and output terminals, a controlled key, one terminal connected to a common terminal, control terminal to the output of the source of control signals, additionally introduced transform current ator, second and third diodes, and the beginning of the primary winding of the current transformer is connected to the free terminal of the controlled key, the end to the connection point of the inductor and the first diode, the beginning of the secondary winding of the current transformer is connected to the input terminal, the end through the second diode, connected counter to the first diode, connected to the output terminal and through the third diode included according to the second diode, connected to the common terminal. It is possible to reduce the dimensions of the core of the current transformer, which is achieved by introducing an additional winding on the core of the current transformer, connected between the inductor and the connection point of the first diode and the primary winding of the current transformer opposite the primary winding of the current transformer. To increase the output voltage of the proposed pulse step-up voltage regulator with continuous output current, it is possible to connect the beginning of the secondary winding of the current transformer to an additionally introduced power source connected to a common terminal. To reduce the amplitude of the pulse voltage on the controlled key when it is turned off, it is possible to introduce an additional power source connected between the common output and the third diode.

Brief Description of the Drawings

In FIG. 1 shows a diagram of the proposed pulse step-up voltage regulator with a continuous output current, FIG. 2 - the same, with an additional winding on the core of the current transformer, in FIG. 3 - the same, with the connection of the beginning of the secondary winding of the current transformer to an additionally introduced power source connected to a common terminal, in FIG. 4 is the same with an additional power source connected between the common terminal and the third diode, in FIG. 5 - curves of currents and voltages of circuit elements shown in FIG. one.

Embodiments of the Inventions

Pulse boost voltage regulator with a continuous output current (Fig. 1) contains input 1, total 2 and output 3 conclusions for connecting the power supply 4 and load 5, the inductor 6, connected to the input terminal 1 by one output, and the output capacitor 8 through the first diode 7 to the output terminal 3, a filtering capacitor 8 connected between the common 2 and output 3 terminals, a controlled key 9 connected to the common terminal 2 by one output, the control terminal 10 to the output of the control signal source 10, the other terminal through the primary winding of the current transformer 11 to the junction point of the inductor 6 and the first diode 7, the second diode 12, connected with one output to you the output terminal 3 meets the first diode 7, the other terminal through the secondary winding of the current transformer 11 to the input terminal 1, the third diode 13 connected between the common terminal 2 and the connection point of the secondary winding of the current transformer 11 and the second diode 12 according to the latter. Pulse step-up voltage regulator with a continuous output current works as follows.

The source of control signals 10 closes and opens the controlled key 9, maintaining the load 5 at the required voltage by changing the duty cycle of the closed state of the controlled key 9.

In the steady state, before closing the controlled key 9, the current of the inductor 6 flows through the circuit: inductor 6, the first diode 7, filter capacitor 8 and load 5, power supply 4, while the energy stored in the inductor 6 is transferred to the filter capacitor 8 and load 5, the current in the inductor 6 decreases. At time t ₀ (see Fig. 5), the source of control signals 10 closes the controlled key 9, the first diode 7 is locked and the current of the inductor 6 closes along the path: inductor 6, the primary winding of the current transformer 11, controlled key 9, power supply 4. In the secondary winding of current transformer 11, a current arises which closes along the path: secondary winding of current transformer 11, second diode 12, filtering capacitor 8 and load 5, power supply 4. In this case, a difference is applied to the secondary winding of current transformer 11 the voltage of the power source 4 and load 5. At this time, the current of the inductor 6 increases.

When the controlled switch 9 is opened at time U, the inductor current 6 closes through the first diode 7, filter capacitor 8 and load 5, power supply 4. At the same time, the second diode 12 is locked, the magnetization current of the core of current transformer 11 is closed through power supply 4 and the third diode 13. In this case, the voltage of the power supply 4 is applied to the secondary winding of the current transformer 11, the core of the current transformer 11 is magnetized and at time t ₂ returns to its original state, corresponding to the moment in belt t ₀ .

At time t _{3, the} source of control signals 10 closes the controlled key 9 and the next period of operation of the pulse boost voltage regulator with continuous output current begins.

Thus, due to the introduction of additional current transformers 11, diodes 12, 13, the output current of the pulse voltage increasing regulator, equal to the sum of the currents through the diodes 7, 12, continuously charges the filter capacitor 8 with both open and closed controlled key 9, which leads to reduce voltage ripple at the load 5.

In the particular case, when the number of turns of the primary and secondary windings of the current transformer 11 are equal to each other, the charging current of the filtering capacitor 8 is almost equal to the current of the inductor 6 and even in the absence of the filtering capacitor 8 the voltage ripple at the load 5 can be insignificant.

In FIG. 2 shows an embodiment of a pulsed step-up voltage regulator with a continuous output current with an additional winding 14 on the core of the current transformer 11, connected in series with the inductor b opposite the primary winding of the current transformer 11.

As a result of DC bias, the working the differential induction of the core of the current transformer 11 can be increased by more than 2 times (almost 2B _S , where B _s is the saturation induction of the magnetic material of the core of the current transformer 11), respectively, and the cross section of the core of the current transformer 11 can be reduced by more than 2 times .

Thus, the introduction of an additional winding 14 on the core of the current transformer 11 allows more than 2 times to reduce the dimensions of the core of the current transformer 11.

In FIG. 3 shows an embodiment of a pulsed step-up voltage regulator with a continuous output current, in which the beginning of the secondary winding of the current transformer AND is connected to an additionally introduced power source 15.

где Uэ_тах - максимальное напряжение на нагрузке 5; U₄ - напряжение источника питания 4;With the same number of turns of the primary and secondary windings of the current transformer 11, the continuous current of the inductor 6 and the continuous output current (the core of the current transformer 11 should not be saturated), the maximum voltage at load 5 will be equal to:

where Ue _max - maximum voltage at load 5; U ₄ - voltage power supply 4;

Ui ₅ - power supply voltage 15.

In the particular case when U ₁₅ = U ₄ , the maximum voltage at load 5, at which the condition of continuous output current is not violated, is U _5ma χ ⁼ (1 + V5) U ₄ / 2. To obtain a higher voltage at load 5, it is enough take voltage source 15 with a voltage higher than U ₄ .

Thus, the introduction of an additional power source 15 allows you to increase the maximum voltage at load 5.

In FIG. 4 shows an embodiment of a pulsed step-up voltage regulator with a continuous output current, in which, in order to reduce the amplitude of the pulsed voltage on the controlled key 9, when it is turned off, an additional a power source 16 (generally adjustable) connected between the common terminal 2 and the third diode 13.

When the managed key 9 is turned off, the process of magnetization reversal of the core of the current transformer 11 begins. At this time, the sum of the voltages on the load 5 and on the primary winding of the current transformer 11 is applied to the managed key 9. The voltage on the primary winding of the current transformer 11 is proportional to the voltage difference of the power supply 4 and the additional source nutrition 16.

Thus, the introduction of an additional power source 16 reduces the amplitude of the pulse voltage on the controlled key 9 when it is turned off.

In case of equal number of turns of the primary and secondary windings of the current transformer 11, this decrease is the voltage value of the additional power source 16.

Industrial applicability

The most appropriate application of this invention in uninterruptible power supplies, power factor correctors, pulse boost voltage regulators of high power. In particular, when using the proposed pulse step-up voltage regulator with a continuous output current together with a frequency electric drive, it is possible to increase the rotation speed of the motor shaft by more than one and a half times while maintaining the moment on the shaft. This mode can be used in an electric car (electric car) to create a forced power mode.

Claims

CLAIM 1. A pulse step-up voltage regulator with a continuous output current, containing input, common and output terminals for connecting a power source and a load, a choke connected to an input terminal by one output, and a controlled key through a first diode to an output terminal, connected to one output to the general output, the control output - to the output of the source of control signals, a filtering capacitor connected between the common and output terminals, characterized in that the transfer a current romator, second and third diodes, the beginning of the primary winding of the current transformer connected to the free terminal of the controlled key, the end to the connection point of the inductor and the first diode, the beginning of the secondary winding of the current transformer connected to the input terminal, the end through the second diode connected opposite the first a diode connected to the output terminal and through a third diode included according to the second diode connected to a common terminal. 2. A pulse step-up voltage regulator with a continuous output current according to claim 1, characterized in that an additional winding at the core of the current transformer is introduced, connected in series with the inductor opposite the primary winding of the current transformer. 3. A pulse step-up voltage regulator with a continuous output current according to claim 1, characterized in that an additional power source is introduced, connected to a common terminal with one terminal, and connected to the beginning of the secondary winding of the current transformer with one terminal. 4. A pulse step-up voltage regulator with a continuous output current according to claim 1, characterized in that an additional power source is inserted, connected between the common terminal and the third diode.