Method for stepless ac voltage regulation and its phase variation

FIELD: electronics and automatic control; power converter engineering.

SUBSTANCE: proposed method for stepless regulation of ac voltage and its phase variation includes conversion of sine-wave voltage by means of inverter into sequence of amplitude- and length-modulated bipolar pulses of much higher frequency followed by their rectification to produce sine-wave voltage of original frequency across output of ripple filter. Its amplitude is proportional to relative pulse length and phase reversal occurs in response to variation in operating phase of synchronous rectifier switches.

EFFECT: reduced size and ability of varying output voltage phase.

1 cl, 2 dwg

 

The invention relates to the field of electronics and automation. A known method of regulating the AC voltage based on the conversion using a key that works with a significantly higher frequency in the pulse sequence, and regulation of the voltage source frequency obtained at the output of the smoothing filter, by changing their relative duration (A.S. USSR №472339).

The disadvantage of this method is the use of input Waldoboro transformer that extends the limits of regulation and with the industrial frequency of very considerable dimensions. In addition, this method does not allow you to change the phase of the output voltage. The purpose of the invention is to remedy these disadvantages.

The invention consists in transforming the AC voltage u1the frequency f of the inverter 1 (see figure 1) into a sequence of bipolar pulses u2(see figure 2), the length of which τ regulated by keys K1-K4 of the inverter 1, and the frequency F much higher f.

This allows you to limit the extension of regulation or approval to use a high-frequency transformer 2 having significantly smaller dimensions. The transformed pulses fed to the input of the synchronous rectifier 3 keys K5, K6 switch in which motiviate with frequency F. The rectified pulses u3entering the input filter 4 (see figures 1 and 2)are amplitude modulated by a sinusoid of frequency f (the phase of which is inverted when the phase change operation keys K5, K6 (u'3figure 2). As a result, the output of the smoothing filter 4 is obtained a voltage source of frequency f, the amplitude of which is proportional to the relative pulse duration u2and the phase can be changed to the opposite, changing the phase of the operation keys K5, K6 (u4and u'4figure 2).

Figure 1 presents the scheme of realization of the way of smooth regulation of the magnitude and phase change of the AC voltage.

Figure 2 presents the timing diagram of voltages at the inverter output, synchronous rectifier and a smoothing filter.

The possibility of realization of the proposed method is confirmed by simulation.

The way of smooth regulation and changes the phase of the AC voltage based on converting it using the inverter in a sequence of bipolar pulses of much higher frequency, the relative duration of which determines the magnitude of the regulated voltage supply through a high-frequency transformer, which establishes the limits of regulation, synchronous rectifier, the change of phase of operation keys which is about the changes the phase of the controlled voltage source frequency, obtained at the output of the smoothing filter to the opposite.



 

Same patents:

The invention relates to the field of electrical engineering and can be used in control systems, voltage converters with fully controllable valves used in the transmission and inserts DC voltage or high-voltage drives

The invention relates to a Converter equipment and can be used for independent adjustment of frequency and voltage, multi-phase load such as a stator winding of an induction motor

FIELD: electrical engineering.

SUBSTANCE: proposed converter designed for charging energy storage capacitors used in pulsed electromagnetic devices and dc voltage supplies has two power switches 1 and 2, diodes 3 and 4, and choke 5.

EFFECT: enhanced precision of regulating output voltage by instant breaking of storage capacitor charge current.

1 cl, 4 dwg

The invention relates to equipment and can be used in night vision devices for supply of electro-optical converters

Converter // 2260894

FIELD: converter and pulse engineering; feeding pulse-power loads.

SUBSTANCE: proposed converter designed to convert dc to pulse energy has power buses 1 with forward diodes 2, 3, regulating transistor 4 with control unit 5 in base circuit, output transformer 6 with two sections 7, 8 of input winding, first and second capacitors 9, 10 connected to starting lead of winding section 7 and to finishing lead of section 8, second leads of capacitors 9 and 10 being connected to emitter and collector of transistor 4, respectively. Novelty is that finishing lead of first section 7 is connected to collector and starting lead of second section 8, to emitter of regulating transistor 4 through cumulative magnetically coupled windings 11, 12 of choke 13, and diodes 2, 3 of power buses are connected to common point of input winding section and choke winding 13 cumulatively with transistor 4. Power buses are shorted out by additional diode 14.

EFFECT: reduced switching losses.

2 cl, 2 dwg

Voltage converter // 2260833

FIELD: electric engineering.

SUBSTANCE: device has broadband pulse modulator, power amplifier, field transistor, service electric power source, special pulse generator, overload protection device, voltage stabilizer, voltage check connection device, also provided is overload protection device with first optic couple and differential amplifier, check connection device is made on two differential amplifiers and second optic couple, LC-filter, four resistive dividers.

EFFECT: higher reliability, lower costs, higher quality.

1 dwg

FIELD: electric engineering.

SUBSTANCE: device has adjusting element 2, input of which is connected to input 1 of voltage transformer, and output - to first output of voltage transformer, block 3 for controlling protection, output of which is connected to control input of adjusting element 2, overload detector 6, connected to common bus and input of which is connected to second output of voltage transformer. Also provided are repeated enabling delay block 4 and overload duration determining block 5.

EFFECT: higher efficiency, broader functional capabilities.

2 dwg

FIELD: electric engineering.

SUBSTANCE: device has compound adjusting element 1, force transistor 2, synchronization transistor 3, discordance signal amplifier 4, resistor 5, protective transistor 6. when main power fails, protective transistor opens to lift voltage from collector of transistor 3 and amplifier 4. this provides protection for transistor 3 from overload and increases reliability of stabilizer operation.

EFFECT: higher reliability, higher efficiency.

2 dwg

FIELD: electric engineering.

SUBSTANCE: for controlling constant voltage pulse stabilizer current value of stabilized voltage is measured, measured value is compared with constant support voltage, on basis of discordance signal by means of synchronization voltage of saw-like shape broad-pulse modulated signal is formed, used for controlling adjusting stabilizer element. Also, this signal is demodulated and received correction signal is added to discordance signal. When selecting correction signal transfer coefficient, static error value of voltage stabilization is corrected. It is possible to ensure equality of static error to zero by selecting transfer coefficient appropriately. Current control method is effective for different variants of direct voltage converters (of increasing, decreasing and inverting types) and different modes of their operation (as with continuous, as with discontinuous stabilizer throttle currents).

EFFECT: lesser static error of voltage stabilization in case of external interference (change of inlet voltage or load resistance, influence of non-ideal elements of stabilizer power circuit).

3 dwg

FIELD: power units designed to ensure spark safety of loads.

SUBSTANCE: proposed device 200 designed to supply with power spark-proof load provided with feedback circuit of integrated current supply and current limiting component and also to minimize voltage that should be limited in compliance with sparking safety standards has power supply PS and output terminals T1-T2 for connecting device to spark-proof load. Voltage limiting unit Z1 inserted between power supply PS and output terminals T1-T2 is used to limit voltage across load leads. Current limiting unit 202 has barrier resistors designed for current-to-voltage conversion to provide for comparison by operational amplifier that controls variable impedance Q1 and limits current supply to load.

EFFECT: reduced manufacturing cost, improved sparking safety.

19 cl, 3 dwg

FIELD: electric engineering.

SUBSTANCE: support voltage source has first and second amplifiers 5, 6, two power sources 7, 8 of opposite polarity, first and second resistors 1, 2, connected serially and connected between common point 7, 8 and inverse input 5, connected to output 6, and serially connected third and fourth resistors 3, 4, which are connected to middle point of resistors 1, 2 and to output of amplifier 5, inverse amplifier input 6 is connected to middle point of resistors 3, 4, while non-inverse inputs of amplifier 5, 6 are connected by common point 7, 8. as first and fourth resistors a non-linear element is connected, having volt-ampere characteristics of voltage stabilizer. As resistor 2 or 3 non-linear element is connected, having volt-ampere characteristics of current stabilizer.

EFFECT: simplified construction.

2 cl, 4 dwg

FIELD: voltage regulation circuits used in manufacture of chip-carrying card integrated circuits.

SUBSTANCE: proposed circuit has series regulator L with field-effect transistor M1. Series-connected between source lead placed at higher potential VDDext and gate lead M1 are capacitor C1 and second field-effect transistor that functions as transmitting gate TG1 controlled by power/reset signal POR. Applying external supply voltage VDDext with series-connected transmitting gate TG1 drives in conduction field-effect transistor M1 in compliance with charge of capacitor C1 that takes place in the process. As this charge takes certain time, overshoot of internal voltage VDDint can be avoided.

EFFECT: reduced degree of overshoot when driving transistor in conduction.

3 cl, 5 dwg

The invention relates to a Converter equipment and can be used to control pulse stabilizers, constant voltage raising type with pulse-width modulation, which is connected to the energy source of limited capacity, with the properties of the current source

The invention relates to a Converter equipment and can be used to control pulse stabilizers, constant voltage (PSI) boost-type (RO) with pulse-width modulation having a small duration of transients and static error of output voltage stabilization

FIELD: voltage regulation circuits used in manufacture of chip-carrying card integrated circuits.

SUBSTANCE: proposed circuit has series regulator L with field-effect transistor M1. Series-connected between source lead placed at higher potential VDDext and gate lead M1 are capacitor C1 and second field-effect transistor that functions as transmitting gate TG1 controlled by power/reset signal POR. Applying external supply voltage VDDext with series-connected transmitting gate TG1 drives in conduction field-effect transistor M1 in compliance with charge of capacitor C1 that takes place in the process. As this charge takes certain time, overshoot of internal voltage VDDint can be avoided.

EFFECT: reduced degree of overshoot when driving transistor in conduction.

3 cl, 5 dwg

FIELD: electric engineering.

SUBSTANCE: support voltage source has first and second amplifiers 5, 6, two power sources 7, 8 of opposite polarity, first and second resistors 1, 2, connected serially and connected between common point 7, 8 and inverse input 5, connected to output 6, and serially connected third and fourth resistors 3, 4, which are connected to middle point of resistors 1, 2 and to output of amplifier 5, inverse amplifier input 6 is connected to middle point of resistors 3, 4, while non-inverse inputs of amplifier 5, 6 are connected by common point 7, 8. as first and fourth resistors a non-linear element is connected, having volt-ampere characteristics of voltage stabilizer. As resistor 2 or 3 non-linear element is connected, having volt-ampere characteristics of current stabilizer.

EFFECT: simplified construction.

2 cl, 4 dwg

FIELD: power units designed to ensure spark safety of loads.

SUBSTANCE: proposed device 200 designed to supply with power spark-proof load provided with feedback circuit of integrated current supply and current limiting component and also to minimize voltage that should be limited in compliance with sparking safety standards has power supply PS and output terminals T1-T2 for connecting device to spark-proof load. Voltage limiting unit Z1 inserted between power supply PS and output terminals T1-T2 is used to limit voltage across load leads. Current limiting unit 202 has barrier resistors designed for current-to-voltage conversion to provide for comparison by operational amplifier that controls variable impedance Q1 and limits current supply to load.

EFFECT: reduced manufacturing cost, improved sparking safety.

19 cl, 3 dwg

FIELD: electric engineering.

SUBSTANCE: for controlling constant voltage pulse stabilizer current value of stabilized voltage is measured, measured value is compared with constant support voltage, on basis of discordance signal by means of synchronization voltage of saw-like shape broad-pulse modulated signal is formed, used for controlling adjusting stabilizer element. Also, this signal is demodulated and received correction signal is added to discordance signal. When selecting correction signal transfer coefficient, static error value of voltage stabilization is corrected. It is possible to ensure equality of static error to zero by selecting transfer coefficient appropriately. Current control method is effective for different variants of direct voltage converters (of increasing, decreasing and inverting types) and different modes of their operation (as with continuous, as with discontinuous stabilizer throttle currents).

EFFECT: lesser static error of voltage stabilization in case of external interference (change of inlet voltage or load resistance, influence of non-ideal elements of stabilizer power circuit).

3 dwg

FIELD: electric engineering.

SUBSTANCE: device has compound adjusting element 1, force transistor 2, synchronization transistor 3, discordance signal amplifier 4, resistor 5, protective transistor 6. when main power fails, protective transistor opens to lift voltage from collector of transistor 3 and amplifier 4. this provides protection for transistor 3 from overload and increases reliability of stabilizer operation.

EFFECT: higher reliability, higher efficiency.

2 dwg

FIELD: electric engineering.

SUBSTANCE: device has adjusting element 2, input of which is connected to input 1 of voltage transformer, and output - to first output of voltage transformer, block 3 for controlling protection, output of which is connected to control input of adjusting element 2, overload detector 6, connected to common bus and input of which is connected to second output of voltage transformer. Also provided are repeated enabling delay block 4 and overload duration determining block 5.

EFFECT: higher efficiency, broader functional capabilities.

2 dwg

Voltage converter // 2260833

FIELD: electric engineering.

SUBSTANCE: device has broadband pulse modulator, power amplifier, field transistor, service electric power source, special pulse generator, overload protection device, voltage stabilizer, voltage check connection device, also provided is overload protection device with first optic couple and differential amplifier, check connection device is made on two differential amplifiers and second optic couple, LC-filter, four resistive dividers.

EFFECT: higher reliability, lower costs, higher quality.

1 dwg

Up!