CN-224233572-U - Soft starter with voltage regulator self-checking function

CN224233572UCN 224233572 UCN224233572 UCN 224233572UCN-224233572-U

Abstract

The utility model discloses a soft starter with a voltage regulator self-test function, which is used for carrying out static detection and triggering detection on thyristors before the operation, eliminating the potential problems existing in the thyristors before equipment is put into operation, avoiding the problem that the soft starter malfunctions in the operation process to affect the whole motor system, effectively preventing production interruption or power grid impact, and simultaneously realizing state detection of a plurality of groups of anti-parallel transistor groups by multiplexing a detection core circuit only by arranging a set of detection circuits, thereby greatly reducing the hardware cost of the soft starter. According to the technical scheme, the soft starter with the voltage regulator self-checking function realizes the thyristor self-checking function of industrial-grade reliability under the condition of limited hardware cost by multiplexing the driving circuit through the channel selection switch.

Inventors

Chen Genpeng
NAN CHENG
LI XIAOLIN
LIN RUHAO
WEN FAQING

Assignees

浙江银岸电气科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250609

Claims (10)

1. The soft starter with the voltage regulator self-test comprises a processor, a thyristor driving circuit and an anti-parallel thyristor group, wherein the output end of the processor is connected with the input end of the thyristor driving circuit, and the output end of the thyristor driving circuit is connected with the anti-parallel thyristor group; The output end of the processor is respectively connected with the input ends of the channel selection circuit and the detection trigger circuit, the output end of the detection trigger circuit is connected with the input end of the channel selection circuit, the output end of the channel selection circuit is respectively connected with the gate electrodes of the thyristors in the anti-parallel transistor group, and the processor independently controls the gate electrode driving of the thyristors in the anti-parallel transistor group through the channel selection circuit and the detection trigger circuit; the isolation test power supply and the thyristor detection switch circuit are respectively connected with the anti-parallel thyristor group, and the isolation test power supply provides test voltage for the anti-parallel thyristor group; The thyristor detection switch circuit is connected with the input end of the thyristor voltage detection circuit, the output end of the thyristor voltage detection circuit is connected with the input end of the processor, and the thyristor detection switch circuit is used for switching on and off between the anti-parallel thyristor group and the thyristor voltage detection circuit.
2. The soft starter with the voltage regulator self-test according to claim 1, wherein the detection trigger circuit comprises a resistor R1, a resistor R2, a resistor R3, a triode Q1, an optical coupler U1, a capacitor C1 and a gate electrode driving amplifying chip U2, one end of the resistor R1 is connected with an output end of the processor, the other end of the resistor R1 is connected with a base electrode of the triode Q1, an emitter electrode of the triode Q1 is grounded, a collector electrode of the triode Q1 is connected with a cathode electrode of the optical coupler U1, an anode electrode of the optical coupler U1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with a high level, a collector electrode of the optical coupler U1 is connected with a high level, an emitter electrode of the optical coupler U1 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with a second pin of the gate electrode driving amplifying chip U2, a first pin, a third pin and an eighth pin of the gate electrode driving amplifying chip U2 are connected with a high level, a fourth pin of the gate electrode driving amplifying chip U2 and a seventh pin of the gate electrode driving amplifying chip are connected with a gate electrode of the other end of the gate electrode driving amplifying chip U2, and a gate electrode of the gate electrode driving amplifying chip is connected with a seventh pin of the gate electrode driving amplifying chip 2.
3. The soft starter with voltage regulator assembly self-test according to claim 2, wherein the channel selection circuit comprises an analog switch chip U3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a resistor R9, wherein a first pin, a fifteenth pin and a sixteenth pin of the analog switch chip U3 are respectively connected with an output end of the processor, a third pin and a fourteenth pin of the analog switch chip U3 are respectively grounded, a thirteenth pin of the analog switch chip U3 is connected with a high level, an eighth pin of the analog switch chip U3 is connected with a seventh pin of the gate driving amplifying chip U2, one end of the resistor R4, one end of the resistor R5, one end of the resistor R6, one end of the resistor R7, one end of the resistor R8 and one end of the resistor R9 are respectively connected with a channel of the analog switch chip U3, and the other end of the resistor R4, the other end of the resistor R5, the other end of the resistor R6, the other end of the resistor R7 and the other end of the resistor R9 are respectively connected with a gate of the transistor group in parallel.
4. A soft starter with voltage regulator assembly self-test as recited in claim 3, wherein said gate drive amplifier chip U2 is model IXDD414,414 and said analog switch chip U3 is model DG408.
5. The soft starter with voltage regulator assembly self-test according to claim 1, wherein the isolation test power supply comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C2, a capacitor C3, an operational amplifier U4 and a MOS transistor Q2, one end of the resistor R10 is connected to the output end of the processor, the other end of the resistor R10 is connected to one end of the resistor R11 and the non-inverting input end of the operational amplifier U4, the other end of the resistor R11 is grounded, the capacitor C2 is connected in parallel to two ends of the resistor R11, the output end of the operational amplifier U4 is connected to the gate of the MOS transistor Q2, the drain electrode of the MOS transistor Q2 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to a high level, the capacitor C3 is connected in parallel to two ends of the resistor R14, the source electrode of the MOS transistor Q2 is connected to one end of the resistor R13 and one end of the non-inverting input end of the resistor U4 is connected to the other end of the transistor Q2.
6. The soft starter with voltage regulator self-test according to claim 5, wherein the thyristor detection switch circuit comprises a relay K1, wherein one ends of a first group of normally open contacts of the relay K1 are respectively connected with a first end of the anti-parallel transistor group, one ends of a second group of normally open contacts of the relay K1 are respectively connected with a second end of the anti-parallel transistor group, and a coil of the relay K1 is connected with an output end of the processor.
7. The soft starter with voltage regulator self-test according to claim 6, wherein the thyristor voltage detection circuit comprises a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and an operational amplifier U5, one end of the resistor R16 is connected with the other end of the first group of normally open contacts of the relay K1, the other end of the resistor R16 is connected with the non-inverting input end of the operational amplifier U5, one end of the resistor R17 is connected with the other end of the second group of normally open contacts of the relay K1, the other end of the resistor R17 is connected with the inverting input end of the operational amplifier U5, one end of the resistor R18 is connected with the inverting input end of the operational amplifier U5, and the other end of the resistor R18 is respectively connected with the output end of the operational amplifier U5 and one end of the resistor R20.
8. The soft starter with voltage regulator self-test according to claim 7, wherein the thyristor voltage detection circuit further comprises an isolation amplifier U6, a first pin and an eighth pin of the isolation amplifier U6 are respectively connected with a high level, a fourth pin and a fifth pin of the isolation amplifier U6 are respectively grounded, a second pin and a third pin of the isolation amplifier U6 are respectively connected with an output signal of the operational amplifier U5, and a sixth pin and a seventh pin of the isolation amplifier U6 are respectively connected with an input end of the processor.
9. The soft starter with voltage regulator assembly self-test of claim 8, wherein the isolation amplifier U6 is model AMC1301.
10. A soft starter with voltage regulator assembly self-test according to any one of claims 1 to 9, further comprising an indication circuit, an input of said indication circuit being connected to an output of said processor.

Description

Soft starter with voltage regulator self-checking function Technical Field The utility model relates to the technical field of soft starters, in particular to a soft starter with a voltage regulator assembly self-checking function. Background The soft starter is an advanced motor control device integrating the functions of soft start, soft stop, light load energy saving and various protection of a current collector, and has the core function of gradually adjusting input voltage through anti-parallel thyristors to realize smooth start, stop and operation protection of a motor. The anti-parallel thyristors are key devices of the soft starter, the motor can not be started normally due to faults of the anti-parallel thyristors, production interruption is caused, starting current is out of control even due to thyristor short circuit, and the stability of a power grid is threatened. From the safety aspect, the most afraid of power equipment is hidden faults, especially in the application occasions with higher requirements on system reliability, safety and maintenance convenience, if the anti-parallel thyristors are in faults in the starting operation process of the motor, the motor can not normally operate easily, and therefore production interruption or production accidents are caused. The soft starter is usually provided with three groups of anti-parallel thyristors for motor operation control, and a corresponding detection circuit is configured for each group of anti-parallel thyristors, so that a large amount of production cost is increased. In view of the foregoing, there is a need for a soft starter with voltage regulator self-test function and with low cost. Disclosure of Invention In order to solve the problems, the utility model provides a soft starter with a voltage regulator self-test function, which comprises a processor, a thyristor driving circuit, an anti-parallel thyristor group, a channel selection circuit, a detection trigger circuit, an isolation test power supply, a thyristor detection switch circuit and a thyristor voltage detection circuit, wherein the output end of the processor is connected with the input end of the thyristor driving circuit; The output end of the processor is respectively connected with the input ends of the channel selection circuit and the detection trigger circuit, the output end of the detection trigger circuit is connected with the input end of the channel selection circuit, the output end of the channel selection circuit is respectively connected with the gate electrodes of the thyristors in the anti-parallel transistor group, and the processor independently controls the gate electrode driving of the thyristors in the anti-parallel transistor group through the channel selection circuit and the detection trigger circuit; the isolation test power supply and the thyristor detection switch circuit are respectively connected with the anti-parallel thyristor group, and the isolation test power supply provides test voltage for the anti-parallel thyristor group; The thyristor detection switch circuit is connected with the input end of the thyristor voltage detection circuit, the output end of the thyristor voltage detection circuit is connected with the input end of the processor, and the thyristor detection switch circuit is used for switching on and off between the anti-parallel thyristor group and the thyristor voltage detection circuit. The technical scheme includes that the soft starter with the voltage regulator self-checking comprises thyristor static detection and thyristor triggering detection. The working principle of thyristor triggering detection is that the front self-check is carried out before the soft starter is put into operation, the processor drives the detection trigger circuit to output a control thyristor gate driving signal, and simultaneously controls the channel selection circuit to enable the detection trigger circuit to sequentially carry out gate triggering on thyristors of the anti-parallel thyristor group, the isolation test power supply applies a constant current power supply to the thyristors, the thyristor voltage detection circuit detects the voltage value of the current thyristors, and whether the thyristor triggering is normal or not is judged according to the voltage value. The thyristor static detection working principle is that a trigger signal is not required to be applied to the gate electrode of the thyristor, a constant current power supply is directly applied to the thyristor by an isolation test power supply, the voltage value of the current thyristor is detected by a thyristor voltage detection circuit, and whether the blocking of the thyristor is normal is judged according to the voltage value. The technical scheme is that the soft starter with the voltage regulator self-test performs static detection and trigger detection on the thyristor before the device is put into operation, eliminates the potential problems existing in th