CN212305169U - DC power supply for energy consumption braking - Google Patents

Abstract

A direct current power supply for energy consumption braking comprises a single-phase controlled silicon KT and a phase-shifting trigger circuit for controlling the single-phase controlled silicon KT, and is characterized in that the phase-shifting trigger circuit comprises a synchronous signal sampling circuit and a pulse generator, wherein the synchronous signal sampling circuit comprises a synchronous transformer BK, a diode D1, a diode D2, a resistor R1 and a voltage stabilizing diode DW, and the cathode of the voltage stabilizing diode DW outputs trapezoidal waves; the pulse generator comprises a time-base integrated circuit IC1, a variable resistor R2, a resistor R3, a capacitor C3, a capacitor C2, a resistor R5, a resistor R4, a triode T1 and a pulse transformer MT; the motor has the advantages that the output voltage can be adjusted, and the motor can be conveniently matched with motors with different powers; the volume is small; after the motor braking is finished, the direct current power supply for energy consumption braking automatically stops outputting, and a time delay disconnecting device does not need to be arranged externally.

Description

DC power supply for energy consumption braking

Technical Field

The utility model relates to a DC power supply for energy consumption braking, which uses the braking of an AC motor.

Background

The energy consumption braking of the alternating current motor needs a direct current power supply, the existing direct current power supply circuit is composed of a transformer and a rectifier, and the defects are that the power of the transformer cannot be adjusted, the matched transformer is needed for the motors with different powers, in addition, the current is large during the energy consumption braking, and the size of the transformer is large.

Disclosure of Invention

To the deficiency of the prior art, the utility model provides a DC power supply that energy consumption braking used, its output can be adjusted, and is small too.

The technical scheme of the utility model is, a DC power supply that energy consumption braking used, it includes single-phase silicon controlled rectifier KT, control single-phase silicon controlled rectifier KT's the trigger circuit that moves mutually, characterized by, it includes synchronizing signal sampling circuit to move trigger circuit that moves mutually, impulse generator, synchronizing signal sampling circuit includes, synchronous transformer BK, one end of synchronous transformer BK secondary coil connects the positive pole of diode D1, another termination diode D2's of step-down transformer BK secondary coil positive pole, the center of step-down transformer BK secondary coil is taken a percentage ground connection, diode D1's negative pole is connected with diode D2's negative pole, diode D1's negative pole connects the negative pole of zener diode DW through resistance R1, zener diode DW's positive pole ground connection;

the pulse generator comprises a time-base integrated circuit IC1, wherein the model of the time-base integrated circuit IC1 is NE555, a pin 8 of a time-base integrated circuit IC1 is connected with a power supply VDD, a pin 1 of the time-base integrated circuit IC1 is grounded, a pin 5 of the time-base integrated circuit IC1 is grounded through a capacitor C4, a pin 7 of a time-base integrated circuit IC1 is connected with a cathode of a voltage stabilizing diode DW through a variable resistor R2, a pin 7 of the time-base integrated circuit IC1 is connected with a pin 2 and a pin 6 of a time-base integrated circuit IC1 through a resistor R3, a pin 2 of a time-base integrated circuit IC1 is grounded through a capacitor C3, a pin 4 of a time-base integrated circuit IC1 is connected with the power supply VDD through a capacitor C2, and a pin;

a pin 3 of the time-base integrated circuit IC1 is connected with a base electrode of the triode T1 through a resistor R4, an emitting electrode of the triode T1 is grounded, and a collector electrode of the triode T1 is connected with a power supply VDD through a primary coil of the pulse transformer MT; one end of a secondary coil of the pulse transformer MT is connected with a control electrode of the single-phase silicon controlled rectifier KT through a resistor R6, the other end of the secondary coil of the pulse transformer MT is connected with a cathode of the single-phase silicon controlled rectifier KT, an anode of the single-phase silicon controlled rectifier KT is connected with an anode of an output end of a bridge rectifier QL, an input end of the bridge rectifier QL is connected with a primary coil of the synchronous transformer BK in parallel, an input end of the bridge rectifier QL is connected with a phase B and a phase C of an alternating current power supply in parallel, and a cathode of an output end of the bridge rectifier QL and.

The circuit principle of the direct current power supply for energy consumption braking is that a synchronous signal sampling circuit outputs a trapezoidal wave, the zero crossing point of the trapezoidal wave is synchronous with the zero crossing point of a sine wave voltage UBC, the trapezoidal wave voltage charges a capacitor C3 through a variable resistor R2 and a resistor R3, when the voltage on the capacitor C3 rises to a certain value (when the voltage of a power supply VDD is 2/3), a pin 3 of a time base integrated circuit IC1 becomes high level, a pin 7 of a time base integrated circuit IC1 is conducted with ground, a capacitor C3 discharges through a resistor R3, when the voltage of the capacitor C3 is lower than the voltage 1/3 of the power supply VDD, the pin 3 of the time base integrated circuit IC1 becomes low level, the pin 7 of the time base integrated circuit IC1 is cut off with the ground, the trapezoidal wave voltage charges the capacitor C3 through the variable resistor R2 and the resistor R3 again, oscillation is formed in a circulating mode, a triode amplifies the level signal on the pin 3 of the integrated circuit, driving a pulse transformer to trigger a single-phase controlled silicon KT; the conduction angle of the single-phase controlled silicon KT can be changed by adjusting the resistance value of the variable resistor R2, and the output voltage of the direct current power supply for energy consumption braking is changed. When the capacitor C2 is charged, the voltage on a pin 4 of the time-base integrated circuit IC1 is zero, the voltage on a pin 3 of the time-base integrated circuit IC1 is kept to be zero, the single-phase silicon controlled rectifier KT is cut off, the time constant of the resistor R5 of the capacitor C2 is selected, and the direct-current power supply for energy consumption braking automatically stops outputting after the motor braking is finished.

When the direct current braking device is used, one end of an input end of a direct current power supply for energy consumption braking is connected with a phase B of an alternating voltage, the other end of an input end of a bridge rectifier QL is connected with a phase C of the alternating voltage through a contact JC21, an output end of the direct current power supply for energy consumption braking is connected with a phase B and a phase A winding of the motor through a contact JC22 and a contact JC23, the contact JC21, the contact JC22 and the contact JC23 are in an open state when the motor is electrified (the contact JC1 is closed), the contact JC21, the contact JC22 and the contact JC23 are closed when the motor is deenergized (the contact JC1 is opened), direct current is transmitted to the motor through the phase B and the phase A windings of the motor, and the direct current power.

The motor has the advantages that the output voltage can be adjusted, and the motor can be conveniently matched with motors with different powers; the volume is small; after the motor braking is finished, the direct current power supply for energy consumption braking automatically stops outputting, and a time delay disconnecting device does not need to be arranged externally.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

A DC power supply for energy consumption braking comprises a single-phase silicon controlled rectifier KT and a phase-shifting trigger circuit for controlling the single-phase silicon controlled rectifier KT, wherein the phase-shifting trigger circuit comprises a synchronous signal sampling circuit and a pulse generator.

The synchronous signal sampling circuit comprises a synchronous transformer BK, one end of a secondary coil of the synchronous transformer BK is connected with an anode of a diode D1, the other end of the secondary coil of the step-down transformer BK is connected with an anode of a diode D2, a center tap of the secondary coil of the step-down transformer BK is grounded, a cathode of a diode D1 is connected with a cathode of a diode D2, a cathode of the diode D1 is connected with a cathode of a voltage stabilizing diode DW through a resistor R1, an anode of the voltage stabilizing diode DW is grounded, a voltage waveform on the cathode of the voltage stabilizing diode DW is a trapezoidal wave, and a zero crossing point of the trapezoidal.

The pulse generator comprises a time base integrated circuit IC1, a time base integrated circuit IC1 with model number NE555, a pin 8 of a time base integrated circuit IC1 connected with a power supply VDD, a pin 1 of a time base integrated circuit IC1 grounded, a pin 5 of a time base integrated circuit IC1 grounded through a capacitor C4, a pin 7 of a time base integrated circuit IC1 connected with a cathode of a voltage stabilizing diode DW through a variable resistor R2, a pin 7 of a time base integrated circuit IC1 connected with a pin 2 and a pin 6 of a time base integrated circuit IC1 through a resistor R3, a pin 2 of a time base integrated circuit IC1 grounded through a capacitor C3, a pin 4 of a time base integrated circuit IC1 connected with the power supply VDD through a capacitor C2, a pin 4 of a time base integrated circuit IC1 grounded through a resistor R5, a pin 3 of the time base integrated circuit IC1 connected with a base of a triode T1 through a resistor R4, an emitter of a triode T1 grounded, a collector of the triode T1 connected with, the anode of the diode D5 is connected to the collector of the transistor T1, and the cathode of the diode D5 is connected to the power supply VDD.

One end of a secondary coil of the pulse transformer MT is connected with a control electrode of the single-phase silicon controlled rectifier KT through a resistor R6, the other end of the secondary coil of the pulse transformer MT is connected with a cathode of the single-phase silicon controlled rectifier KT, an anode of the single-phase silicon controlled rectifier KT is connected with an anode of an output end of a bridge rectifier QL, an input end of the bridge rectifier QL is connected with a primary coil of the synchronous transformer BK in parallel, the input end of the bridge rectifier QL is connected with a phase B and a phase C of an alternating current power supply in parallel, a cathode of an output end of the bridge rectifier QL and a cathode of the single-phase silicon controlled rectifier KT are output ends of the direct current power supply for energy consumption braking, an anode of a fly.

The power supply VDD can be added with a secondary coil on the synchronous transformer BK, the secondary coil is connected with the input end of a rectifying filter circuit, and the output end of the stream filter circuit outputs the power supply VDD.

The power supply VDD can also be obtained by connecting the anode of the diode D4 with the cathode of the diode D1, connecting the cathode of the diode D4 with the ground through the capacitor C1, and connecting the cathode of the diode D4 with the power supply VDD; this simplifies the circuit configuration.

Claims (2)

1. A direct current power supply for energy consumption braking comprises a single-phase controlled silicon KT and a phase-shifting trigger circuit for controlling the single-phase controlled silicon KT, and is characterized in that the phase-shifting trigger circuit comprises a synchronous signal sampling circuit and a pulse generator, wherein the synchronous signal sampling circuit comprises a synchronous transformer BK, one end of a secondary coil of the synchronous transformer BK is connected with the anode of a diode D1, the other end of the secondary coil of the step-down transformer BK is connected with the anode of a diode D2, a center tap of the secondary coil of the step-down transformer BK is grounded, the cathode of a diode D1 is connected with the cathode of a diode D2, the cathode of a diode D1 is connected with the cathode of a voltage stabilizing diode DW through a;

the pulse generator comprises a time-base integrated circuit IC1, wherein the model of the time-base integrated circuit IC1 is NE555, a pin 8 of a time-base integrated circuit IC1 is connected with a power supply VDD, a pin 1 of the time-base integrated circuit IC1 is grounded, a pin 5 of the time-base integrated circuit IC1 is grounded through a capacitor C4, a pin 7 of a time-base integrated circuit IC1 is connected with a cathode of a voltage stabilizing diode DW through a variable resistor R2, a pin 7 of the time-base integrated circuit IC1 is connected with a pin 2 and a pin 6 of a time-base integrated circuit IC1 through a resistor R3, a pin 2 of a time-base integrated circuit IC1 is grounded through a capacitor C3, a pin 4 of a time-base integrated circuit IC1 is connected with the power supply VDD through a capacitor C2, and a pin;

a pin 3 of the time-base integrated circuit IC1 is connected with a base electrode of the triode T1 through a resistor R4, an emitting electrode of the triode T1 is grounded, and a collector electrode of the triode T1 is connected with a power supply VDD through a primary coil of the pulse transformer MT; one end of a secondary coil of the pulse transformer MT is connected with a control electrode of the single-phase silicon controlled rectifier KT through a resistor R6, the other end of the secondary coil of the pulse transformer MT is connected with a cathode of the single-phase silicon controlled rectifier KT, an anode of the single-phase silicon controlled rectifier KT is connected with an anode of an output end of a bridge rectifier QL, an input end of the bridge rectifier QL is connected with a primary coil of the synchronous transformer BK in parallel, an input end of the bridge rectifier QL is connected with a phase B and a phase C of an alternating current power supply in parallel, and a cathode of an output end of the bridge rectifier QL and.

2. The dc power supply for energy consumption braking as claimed in claim 1, wherein the anode of the diode D4 is connected to the cathode of the diode D1, and the cathode of the diode D4 is connected to the ground through the capacitor C1.

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