Voltage transformer with overload protection

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

 

The present invention relates to radio engineering, in particular to the secondary power supply sources, and can be used in various electronic devices.

Known transistor switch with overload protection, containing a transistor switch, the output of which is connected to the load control input of which is connected through the delay line to the control unit and to the current sensor and alarm unit (see A.S. USSR №1800608, N 03 To 17/08, 1991).

The disadvantage of this device is a switching transistor switch mode re-enabled regardless of the length of overload.

Known protection device output transistor short circuit in the load containing the output transistor connected to the load control input of which is connected through serially counter enabled the diode and the first resistor and connected in parallel through a second resistor to the output of the optocoupler, the comparator, the first input of which is connected through a third resistor to the power source through a fourth resistor to the control input of the output transistor, the second input of the comparator is connected through a fifth resistor to the collector of the output transistor, the output of the comparator is connected to the connection point between the first resistor and diode (see application Japan No. 3036119, N 03 To 17/08, 2000).

The disadvantage of this device t is aetsa transfer transistor switch mode re-enabled regardless of the length of overload.

The closest in technical essence is a voltage Converter with short circuit protection, containing the protection unit, the output of which is connected to the control input of the regulating element, the output of which is connected to the first output of the voltage Converter to the first comparator input, the first input of the comparison, the second input is connected to the reference voltage, the output of the Comparer connected to the first input of the protection unit, the second input is connected to the output of the current sensor and to the second input of the comparator, the output of which is connected to the third input of the protection unit, and the input of the current sensor is connected to the second output of the output Converter voltage (see A.S. USSR №1836672, N 03 To 17/08, 1991).

The disadvantage of the voltage Converter is in the standby automatic reclosing regardless of the length of overload. This can happen when short-term overload, caused for example by connection to the inverter output uncharged capacity, as well as during startup of the Converter when connected to large capacitive loads. This Converter will not be able to turn on (start), as will be situated in the mode of automatic reclosing an indefinite amount of time, which limits the th scope.

The technical result of the invention is to extend the scope of application due to the possibility of connecting the load voltage Converter with a higher capacity.

The technical result is achieved that the voltage Converter containing the regulatory element, the input of which is connected to the input of the inverter, its output connected to the first inverter output voltage, the control unit protection, the output of which is connected to the control input of the regulating element, detector overload, the input of which is connected to the second inverter output voltage, a first output connected to a common bus, entered the delay block is enabled again and the unit duration of the overload, the input of the latter is connected to the second detector output overload, output it is connected to the first inputs of the control unit protection unit delay reclosing, the second the input of the latter is connected to the input of the Converter, its output connected to the second input of the control unit protection.

Conducted research on the patent and scientific literature suggest that up to this time unknown proposed technical solution that allows to make a conclusion about the presence of novelty of the claimed technical solution.

Use their signs, distinguish the claimed technical solution known in the study of this and related areas section equipment conversion voltage for the same purpose, have been identified that provides the claimed technical solution according to the criterion of "significant differences".

Figure 1 shows the block diagram of the voltage Converter, figure 2 - circuit diagram of the delay block is enabled again and the unit duration of the overload.

The voltage Converter (figure 1) contains the regulatory element 2, whose input is connected to input 1 voltage Converter, the output to the first inverter output voltage, its control input connected to the output of the unit 3 control protection to the second input of which is connected to the output unit 4 delay reclosing, the first input of which is connected to the first input unit 3 security management and to the output of block 5 set the duration of an overload, the input of which is connected to the second output of the detector 6 overload, the input of which is connected to the second inverter output voltage, is connected to the load 7, the first output of the detector 6 overload connected to the common bus of the inverter, the second input unit 4 delay reclosing is connected to the input 1 of the Converter.

Block 3 protection and management can be performed based on the PWM (for example, when ispolzovaniem chip UC3844).

Unit 4 delay reclosing (figure 2) contains the first 8 resistor, a first output which is connected to the second input unit 4 delay reclosing, a second output connected to the output unit 4 delays re-enable, through a capacitor 9 to the shared bus and 10 through the second resistor to the collector of the transistor 11, the emitter of which is connected to the shared bus, the base of transistor 11 is connected through the third resistor 12 to the first input unit 4 delays re-enable.

Unit 5 installation duration overload (figure 2) contains a resistor 15, a first output which is connected to the source 14 of the reference voltage, the second terminal of the resistor 15 through directly enabled the diode 16 is connected to the collector of transistor 17, which is connected to the output unit 5 installation duration overloads to the first output capacitor 13, the second terminal of which is connected to the shared bus, the emitter of transistor 17 is connected to the shared bus, the base of it to the input unit 5 installation duration overloads.

The detector 6 overload can be performed using a current sensor and a voltage comparator.

The voltage Converter operates as follows.

When power is applied through the resistor 8 starts to charge the capacitor 9 unit 4 delays re-enabled when the voltage on the capacitor 9 reaches the value required on the I turn on the unit 3 control protection the output of the last appears pulses which are fed to the control input of the regulating element 2, you receive the current which flows through the load 7. When the load current 7 not exceeding the threshold detector 6, the output voltage is maintained at the level UMr.transistor 17 block 5 install the duration of the overload is in the saturation state, the voltage at the output is approximately equal to zero, the transistor 11 unit 4 is closed.

During the lowering of the output voltage caused by overload (load connection with high capacity), the current detector 6 overload is reduced to zero, the transistor 17 unit 5 is closed, the capacitor 13 unit 5 starts to charge from the source 14 through the resistor 15 and the diode 16. The output voltage of the transistor 17 increases with increasing voltage on the capacitor 13 and upon reaching the specified level at the output of the unit 3 control protection control pulses are absent. The capacitor 13 unit 5 starts to discharge through the transition base-emitter voltage of transistor 11, transistor 11 begins to open. When the voltage at the output of the transistor 11 unit 4 will be reduced to the threshold off block 3 protection goes into standby mode, current consumption is reduced. The delay time from the date of termination of the current detector 6 overload until it reaches a level in unit 5 definition what is the resistance of resistor 15 and capacitor 13 unit 5 installation duration overloads.

When short-term overload current detector 6 is restored before the voltage in the unit 5 reaches a predetermined level, the transistor 17 unit 5 is opened, discharges the capacitor 13 to zero and disabling the regulating element 2 does not occur.

When an overload on the output of the detector 6 overload appears to signal the presence of congestion, which is fed to the input of block 5 install the duration of the overload. If tlane>tmouthwhere tlane- duration overload, tmouthis the time set in block 5, the output of block 5 install the duration of the overload signal is formed at the off regulating element 2, voltage Converter, which is fed to the input of block 3 protection and management, the output of which is fed to the control input element 2, and the input unit 4 delay reclosing. Upon receipt of the signal from block 4 delay reclosing unit 3 control protection disables the regulating element 2 of the voltage Converter.

After turning off the regulating element 2, the voltage Converter capacitor 13 unit 5 discharges through the resistor 12 unit 4 and the transition base-emitter voltage of the transistor 11 (transistor 11 is in the saturation state). The discharge time of the capacitor 13 unit 5 is determined by the values of its capacity and t is tyuleniy resistor 12. The voltage across the resistor 10 of block 4 in the circuit of the collector of the transistor 11 determines the threshold for inclusion. After discharge of the capacitor 13, the transistor 11 is locked, the current of the resistor 10 becomes zero and the Converter enters the automatic reclosing.

The proposed inverter with overload protection allows you to set a longer duration overloads that expands the scope of its application due to the possibility of connecting loads with high capacity.

The voltage Converter containing the regulatory element, the input of which is connected to the input of the inverter, its output connected to the first inverter output voltage, the control unit protection, the output of which is connected to the control input of the regulating element, detector overload, the input of which is connected to the second inverter output voltage, a first output connected to the shared bus, wherein the introduced delay block is enabled again and the unit duration of the overload, the input of the latter is connected to the second detector output overload, output it is connected to the first inputs of the control unit protection unit delay reclosing, the second input of the latter is connected to the input of the Converter, its output connected to the second I the remote control unit protection.



 

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