Voltage converter

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

 

This invention relates to electrical engineering, namely the secondary power supply sources.

Known voltage Converter [1], contains a control unit, control unit, LC filter, resistive current sensor, comparator, the amplifier, the current source.

The closest in technical essence is a voltage Converter [2], which contains a pulse-width modulator, power amplifier, power amplifier, the source of utility power, the generator of special pulses, device overload protection measuring transformer and the first differential amplifier, the power transformer with the first secondary winding, a voltage regulator, a device feedback voltage from the second differential amplifier, the first voltage reference and the first resistive divider, diodes, output LC filter, and the output of the pulse-width modulator connected to the input of the power amplifier, the output of which is connected to the input of the power stage gain first conclusions of the primary windings of the measuring and power transformers are connected together, the anode of the first diode is connected to the output of the first secondary winding of the power transformer to the cathode of the first diode is connected to the output LC filter, the output of the voltage Converter connected wholersale resistive divider, the output of which is connected to the first input of the second differential amplifier to the second input of the second differential amplifier connected to the output of the first voltage reference, the output of the first differential amplifier connected to the first input pulse-width modulator.

The disadvantage of this inverter is the lack of protection of the payload surge with the possible failure of its control loop (feedback device voltage).

The technical result of the invention is to improve reliability, reducing energy consumption of the voltage Converter, improving the quality of the output voltage.

This technical result is achieved in the voltage Converter containing a pulse-width modulator, power amplifier, power amplifier, the source of utility power, the generator of special pulses, device overload protection measuring transformer and the first differential amplifier, the power transformer with the first secondary winding, a voltage regulator, a device feedback voltage from the second differential amplifier, the first voltage reference and the first resistive divider, diodes, output LC filter, and the output pulse width of the module the ora is connected to the input of the amplifier, the output of which is connected to the input of the power amplifier, the first conclusions of the primary windings of the measuring and power transformers are connected together, the anode of the first diode is connected to the output of the first secondary winding of the power transformer to the cathode of the first diode is connected to the output LC filter, the output of the voltage Converter connected to the input of the first resistive divider, the output of which is connected to the first input of the second differential amplifier to the second input of the second differential amplifier connected to the output of the first voltage reference, the output of the first differential amplifier connected to the first input pulse-width modulator, the fact that it introduced the second resistive divider, the protection device surge with the third differential amplifier, a third voltage divider, a second voltage reference and the first optical coupler, the device voltage feedback entered the fourth differential amplifier, the second optical coupler and the fourth resistive divider, power transformer, a second secondary winding, a source of official power output of the second secondary winding of the power transformer is connected to the anode of the second diode, the cathode of which is connected to the first input voltage, a second input of the stabilization of atora voltage is connected to the positive input potential of the voltage Converter, the output of the voltage regulator is connected to the inputs of the second and fourth resistive dividers, device overload protection to the output of the secondary winding of the transformer is connected to the anode of the third diode, the cathode of which is connected to the first input of the first differential amplifier to the second input of the first differential amplifier connected to the output of the second resistive voltage divider in the feedback device voltage output of the second differential amplifier connected to the input of the second photo coupler, the output of which is connected to the first input of the fourth differential amplifier to the second input of the fourth differential amplifier connected to the output of the fourth resistor divider, the output of the fourth differential amplifier is connected to the second input pulse-width modulator the output of generator special pulses connected to the first input pulse-width modulator, to which is also connected to the cathode of the third diode, the power amplification stage is performed on a field-effect transistor, the gate of which is connected to the output of the amplifier to the drain of the field-effect transistor connected to the second terminal of the primary winding of the power transformer, the inverter output voltage is connected to the input of the third resistive divider, the output of which is connected to the first input trateg the differential amplifier, to the second input of the third differential amplifier connected to the output of the second voltage reference, the output of the third differential amplifier connected to the input of the first opto-couplers, the output of which is connected to the first input pulse-width modulator.

The introduction device surge protection with third differential amplifier, a third voltage divider, a second voltage reference and the first optical coupler, connecting the first output of the optocoupler to the first input pulse-width modulator is formed back loop regulation of the output voltage, which in the case of failure feedback device not only protects the payload from emergency surge, but also ensures the continuity of its future supply. Thus, combining the functions of overvoltage protection, not requiring emergency shutdown voltage Converter, and the continuity of power after a failure has occurred by the introduction of a single device improves reliability and simplifies the design and design.

Introduction current feedback primary winding of the power transformer, made with the use of a measuring transformer, reduces the reaction time of the control loop of the output voltage at the abrupt change in the one of the voltage and the load current, that increases the quality of output voltage.

Performing power amplification field effect transistor reduces losses by conduction and switching due to the higher frequency properties of the field-effect transistor in comparison with the bipolar transistor, which increases the efficiency of the Converter and reduces energy consumption.

The implementation of the Converter voltage on the flyback circuit provides a control output voltage in a wide range of input voltage without the use of additional protections, which increases reliability, reduces power consumption, simplifies the design and design.

The drawing shows an electric diagram of the voltage Converter.

The voltage Converter comprises a generator of special pulse 1 (e.g., sawtooth), pulse-width modulator 2, the amplifier 3, the power transformer TV1, device overload protection measuring transformer TA1 and the first differential amplifier 4', device feedback voltage from the second differential amplifier 4", the first resistive divider 5' and the first reference-voltage source 6', the second resistive divider 5, the device surge protection with third differential amplifier 4"', the third resistive divider 5"', Deut the m voltage reference 6" and the first optical coupler 7', the voltage regulator 8, the output LC filter 9. In the device feedback voltage to the output of the second differential amplifier 4 connected to the input of the second optocoupler 7", the output of which is connected to the first input of the fourth differential amplifier 4IV. The output of the fourth resistive divider 5IVconnected to the second input of the fourth differential amplifier 4IV.

The primary winding I' power transformer TV1 and the primary winding I of transformer is connected with its first conclusions. Entrance "and" positive potential with respect to the input "b" of the voltage Converter connected to the second output of the primary winding I' transformer TA1. To output "b" of the first secondary winding II' power transformer TV1 is connected to the anode of the first diode VD1, the cathode of which is connected to the input of the output LC filter.

The output "g" of the positive potential of the output voltage of the Converter voltage on the output "d" is connected to the input of the first resistive divider 5' and the input of the third resistive divider 5"'. The output of the first resistive divider 5' connected to the first input of the second differential amplifier 4"to the second input of which is connected to the output of the first reference-voltage source 6'. The output of the third resistive divider 5"' is connected with lane the first input of the third differential amplifier 4"', to the second input of which is connected the output of the second voltage reference 6".

The source of official power output of the second secondary winding III' power transformer TV1 is connected to the anode of the second diode VD2, the cathode of which is connected to the first input of the voltage regulator 8. The output of the voltage regulator 8 is connected to the inputs of the second resistive divider 5", the fourth resistive divider 5IVthe power input of the first differential amplifier 4', pulse-width modulator 2, amplifier 3, the fourth differential amplifier 4IVfirst optocoupler 7' and the second optocoupler 7'.

To the anode of the third diode VD3 is connected to the output of the secondary winding II of the measuring transformer TA1. To the cathode of the third diode VD3 is connected to the first input of the first differential amplifier 4'to the second input of which is connected the output of the second resistive divider 5".

To the first input pulse-width modulator 2 is connected to the cathode of the third diode VD3, the output of the first differential amplifier 4', the generator output special pulse 1, the output of the first optocoupler 7'. To the second input pulse-width modulator 2 is connected to the output of the fourth differential amplifier 4IV.

The gate field-effect transistor VT1 is connected to the output of the amplifier 3, and the flow field Tran who istora VT1 the second terminal of the primary winding I' power transformer VT1.

The voltage Converter operates as follows.

Connected to the input of the "a" voltage Converter (see drawing) the DC voltage is supplied to the second input of the voltage regulator 8 and through the primary winding I", I' measuring TA1 and TVI power transformers - drain field-effect transistor VT1. At the output of amplifier 3 is formed by a "comb" is growing smoothly for the duration of the control pulses of the field-effect transistor VT1 with the frequency specified by special generator pulses.

In the flyback Converter circuit voltage primary winding I' and the first secondary winding II' power transformer TV1 spairani so that in the open state of the field-effect transistor TV1 energy accumulated in the core of the power transformer TV1 and within a closed state is transmitted to the inverter output voltage. Thus, a "comb" of the pulses induced in the secondary winding II' power transformer TV1, through the diode VD1 gradually charges the capacitor of the output LC filter 9, which provides a lightweight integration mode voltage Converter. The voltage of the second secondary winding III' through a second diode VD2 is supplied to the first input of the voltage regulator 8, replacing its u who ranchline the power supply voltage, coming from input "a" of the transducer voltage to the second input.

After reaching the voltage at the output g of the inverter voltage to its nominal value occurs regime, stabilizing the output voltage. In control mode rejection output voltage caused by changes in input voltage, load current and ambient temperature, through the first resistive divider 5' compares the second differential amplifier 4 with a reference voltage of the first reference-voltage source 6' and the output of the second differential amplifier 4 in the form of the error signal fed to the input of the second optocoupler 7", which, through the electrical isolation of input from output, transmits a signal at the first input of the fourth differential amplifier 4IVwhere it is compared with the voltage of the fourth resistor divider 5IV. The amplified error signal from the output of the fourth differential amplifier 4IVcome to the second input of pulse width modulator 2, which is compared with a sawtooth signal, proportional to the current of the primary winding I' power transformer TV1 received at the first input pulse-width modulator 2 via the third diode VD3 with the secondary winding II of the measuring transformer TA1. Formed and reinforced to strengthen the Telem power 3 pulse-modulated pulses by adjusting the time of the open state of the FET VT1 compensate for any deviation of the output voltage.

To improve the stability of the control loop at low loads and at low voltages at the input "a" of the voltage Converter to the first input pulse-width modulator 2 summed correction signal sawtooth waveform from the output of the pulse generator of special 1.

Straightened the third diode VD3 signal of the secondary winding II of the measuring transformer TA1 is also supplied to the first input of the first differential amplifier 4' device overload protection and is compared with the threshold voltage of the second resistive divider 5", supplied to the second input of the first differential amplifier 4'. When an overload or short circuit at the inverter output voltage differential output of the first differential amplifier 4' is supplied to the first input of the pulse-width modulator 2, thereby limiting the duration of the control pulses of the field-effect transistor VT1 is proportional to the magnitude of the overload, decrease of output voltage and input current.

When failure occurs in the device voltage feedback with rupture of the main control loop the function of regulating the output voltage will take over the backup path, which is based on the entered device surge protection, the work is completed similarly to the device voltage feedback. This excludes emergency surge in the supply circuit of the payload and provides the continuity and the quality of its power.

Sources of information

1. USSR author's certificate No. 1682989 A1, class G 05 F 1/569.

Switching voltage regulator. 1989

2. USSR author's certificate No. 1640682 A1, class G 05 F 1/569.

The source of stabilized voltage. 1988

The voltage Converter containing a pulse-width modulator, power amplifier, power amplifier, the source of utility power, the generator of special pulses, device overload protection measuring transformer and the first differential amplifier, the power transformer with the first secondary winding, a voltage regulator, a device feedback voltage from the second differential amplifier, the first voltage reference and the first resistive divider, diodes, output LC filter, and the output of the pulse-width modulator connected to the input of the power amplifier, the first conclusions of the primary windings of the measuring and power transformers are connected together, the anode of the first diode is connected to the output of the first secondary winding of the power transformer to the cathode of the first diode is connected to the output LC filter, the inverter output voltage p is dglucan input of the first resistive divider, the output of which is connected to the first input of the second differential amplifier to the second input of the second differential amplifier connected to the output of the first voltage reference, the output of the first differential amplifier connected to the first input pulse-width modulator, characterized in that it introduced a second resistive divider device surge protection with third differential amplifier, a third resistive divider, a second voltage reference and the first optical coupler, the device voltage feedback entered the fourth differential amplifier, the second optical coupler and the fourth resistive divider, power transformer, a second secondary winding, a source of official power output of the second the secondary winding of the power transformer is connected to the anode of the second diode, the cathode of which is connected to the first input voltage, a second input of the voltage regulator is connected to the positive input potential of the voltage Converter to which is also connected the second terminal of the primary winding of the transformer, the output of the voltage regulator is connected to the inputs of the second and fourth resistive dividers, the power input of the first differential amplifier, pulse width modulator,power amplifier, the fourth differential amplifier, first and second optocouplers optocoupler, device overload protection to the output of the secondary winding of the transformer is connected to the anode of the third diode, the cathode of which is connected to the first input of the first differential amplifier to the second input of the first differential amplifier connected to the output of the second resistive voltage divider in the feedback device voltage output of the second differential amplifier connected to the input of the second photo coupler, the output of which is connected to the first input of the fourth differential amplifier to the second input of the fourth differential amplifier connected to the output of the fourth resistor divider, the output of the fourth differential amplifier is connected to the second input pulse-width modulator, the output generator special pulses connected to the first input pulse-width modulator, to which is also connected to the cathode of the third diode, the power amplification stage is performed on a field-effect transistor, the gate of which is connected to the output of the amplifier to the drain of the field-effect transistor connected to the second terminal of the primary winding of the power transformer, the inverter output voltage is connected to the input of the third resistive divider, the output of which is connected to the first input of the third differentiating the amplifier, to the second input of the third differential amplifier connected to the output of the second voltage reference, the output of the third differential amplifier connected to the input of the first opto-couplers, the output of which is connected to the first input pulse-width modulator.



 

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