Power supply device for motor protector and power supplying method thereof

Patent metadata

Field	Value
Publication number	US-12212131-B2
Application number	US-202117377858-A
Country	US
Kind code	B2
Filing date	Jul 16, 2021
Priority date	Jul 16, 2020
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

The disclosure relates to a power supply device for a motor protector and a power supplying method thereof. The motor protector receives power. The power supply device comprises: a first power supplying unit, configured to receive and store the power and supply power to a tripping device of the motor protector; a second power supplying unit, configured to receive the power and supply power to a calculation and control device of the motor protector; a third power supplying unit, configured to receive and store the power and supply power to a reclosing device of the motor protector; and a control unit, configured to control an order in which the first power supplying unit, the second power supplying unit and the third power supplying unit receive the power.

First claim

What is claimed is:

1. A power supply device for a motor protector, the motor protector receives power by inducing alternating current in a power supply line of a motor via a power supplying coil and converting the induced alternating current into direct current utilizing a rectifier device, the power supply device comprising:
a first power supplying unit, configured to receive and store the power, and supply power to a tripping device of the motor protector;
a second power supplying unit, configured to receive the power and supply power to a calculation and control device of the motor protector;
a third power supplying unit, configured to receive and store the power, and supply power to a reclosing device of the motor protector; and
a control unit, configured to control an order in which the first power supplying unit, the second power supplying unit and the third power supplying unit receive the power, so that the first power supplying unit, the second power supplying unit and the third power supplying unit do not receive the power at the same time, but that the power is firstly received by the first power supplying unit, and then received by the second power supplying unit and finally received by the third power supplying unit.

2. The power supply device according to claim 1 , wherein the control unit comprises:
a first control subunit connected between the rectifier device and the second power supplying unit, wherein a first input terminal of the first control subunit is connected with an output terminal of the rectifier device, an output terminal of the first control subunit is connected with the second power supplying unit, the first control subunit controls the second power supplying unit to begin to receive the power when a voltage at the first input terminal of the first control subunit is higher than a first voltage threshold; and
a second control subunit connected between the rectifier device and the third power supplying unit, wherein a first input terminal of the second control subunit is connected with the output terminal of the rectifier device, an output terminal of the second control subunit is connected with the third power supplying unit, the second control subunit controls the third power supplying unit to begin to receive the power when a voltage at the first input terminal of the second control subunit is higher than a second voltage threshold,
wherein the second voltage threshold is higher than the first voltage threshold.

3. The power supply device according to claim 2 , wherein
the first control subunit controls the second power supplying unit to stop receiving the power when the voltage at the first input terminal of the first control subunit is lower than a third voltage threshold, the third voltage threshold is lower than or equal to the first voltage threshold; and
the second control subunit controls the third power supplying unit to stop receiving the power when the voltage at the first input terminal of the second control subunit is lower than a fourth voltage threshold, the fourth voltage threshold is lower than or equal to the second voltage threshold,
wherein the fourth voltage threshold is higher than the third voltage threshold.

4. The power supply device according to claim 1 , wherein
the first power supplying unit comprises a first energy storing subunit, and the first energy storing subunit receives the power to store the power and supplies power to the tripping device of the motor protector by utilizing the stored power.

5. The power supply device according to claim 1 , wherein
the second power supplying unit comprises a first power supply subunit, the first power supply subunit receives the power and supplies power to the calculation and control device of the motor protector at a first output voltage required by the calculation and control device.

6. The power supply device according to claim 1 , wherein
the third power supplying unit comprises a second power supply subunit and a second energy storing subunit,
the second power supply subunit receives the power and supplies power to the second energy storing subunit at a second output voltage required by the second energy storing subunit; and
the second energy storing subunit receives the power provided by the second power supply subunit to store the power, and supplies power to the reclosing device by utilizing the stored power.

7. The power supply device according to claim 6 , wherein
the third power supplying unit further comprises a current limiting circuit connected between the second power supply subunit and the rectifier device, so that a current flowing from the rectifier device into the second power supply subunit is less than or equal to a first current threshold.

8. The power supply device according to claim 2 , further comprising a first anti-reverse connection unit, a second anti-reverse connection unit and a third anti-reverse connection unit, wherein
an input terminal of the first anti-reverse connection unit is connected with the output terminal of the rectifier device, and an output terminal of the first anti-reverse connection unit is connected with an input terminal of the second anti-reverse connection unit and an input terminal of a third anti-reverse connection unit respectively;
an output terminal of the second anti-reverse connection unit is connected with the first power supplying unit;
an output terminal of the third anti-reverse connection unit is connected with the first input terminal and a second input terminal of the first control subunit and the first input terminal of the second control subunit respectively, an input terminal of the third anti-reverse connection unit is connected with a second input terminal of the second control subunit.

9. The power supply device according to claim 8 , further comprising a protection unit, wherein
a first input terminal of the protection unit is connected with an output terminal of the first anti-reverse connection unit, a second input terminal of the protection unit is connected with the output terminal of the rectifier device, and an output terminal of the protection unit is connected with a reference ground, the protection unit enables the first power supplying unit, the second power supplying unit and the third power supplying unit to stop receiving the power when a voltage at the first input terminal of the protection unit is higher than a fifth voltage threshold; and
the protection unit enables the first power supplying unit to begin to receive the power when the voltage at the first input terminal of the protection unit is lower than a sixth voltage threshold, the sixth voltage threshold is lower than the fifth voltage threshold.

10. The power supply device according to claim 8 , wherein
the first control subunit comprises a first hysteresis voltage comparing circuit and a first electronic switch, the first electronic switch is connected between the output terminal of the third anti-reverse connection unit and the second power supplying unit, an input terminal of the first hysteresis voltage comparing circuit is connected with the output terminal of the third anti-reverse connection unit, and an output terminal of the first hysteresis voltage comparing circuit is connected with a control terminal of the first electronic switch;
the second control subunit comprises a second hysteresis voltage comparing circuit and a second electronic switch, the second electronic switch is connected between the input terminal of the third anti-reverse connection unit and the third power supplying unit, an input terminal of the second hysteresis voltage comparing circuit is connected with the output terminal of the third anti-reverse connection unit,

Assignees

• Schneider Electric Ind Sas

Inventors

• Shi Ying
• Zhao Haijun
• Dechamps Fabien
• Zhou Zhangji
• Sun Shuang

Classifications

• H02H7/0851

  for motors actuating a movable member between two end positions, e.g. detecting an end position or obstruction by overload signal · CPC title

• H02J2207/50

  Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors · CPC title

• H02J2207/10

  Control circuit supply, e.g. means for supplying power to the control circuit · CPC title

• H02J7/345

  using capacitors as storage or buffering devices · CPC title

• H02J7/02

  for charging batteries from AC mains by converters · CPC title