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Novel zero-power PTC starter for small refrigerating compressor

A technology for refrigeration compressors and starters, which is applied to motor generators/starters, starters of single-phase induction motors, etc. The effect of convenient matching, zero power consumption and high contact sensitivity

Inactive Publication Date: 2010-12-15
吴更武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there is a counter electromotive force generated when the starting current of the main winding changes to the normal operating current in the secondary coil, the induced current under the action of this counter electromotive force is much smaller than the induced current induced by the secondary coil during normal operation, so there is still A small current flows between the control electrodes of the thyristor, resulting in incomplete shutdown, resulting in current still flowing on the secondary winding

Method used

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  • Novel zero-power PTC starter for small refrigerating compressor
  • Novel zero-power PTC starter for small refrigerating compressor
  • Novel zero-power PTC starter for small refrigerating compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1, refer to figure 1 .

[0013] The present invention is provided with a PTC positive temperature coefficient thermistor 11 connected in series on the secondary winding loop of the compressor motor 100, between the first end 11-1 of the PTC positive temperature coefficient thermistor and the S end of the secondary winding A triac 12 is also connected in series, the second end 11-2 of the PTC positive temperature coefficient thermistor 11 is connected to the power input zero line terminal N, and the starter is also controlled by the triac Between pole 3 and the power input neutral terminal N, a series of normally open reed switch RI and positive temperature coefficient thermistor R are added. t , the excitation coil 14 of the normally open reed switch is also connected in series on the circuit of the main winding of the compressor motor. The T1 pole of the triac is connected to the S terminal of the secondary winding, and the T2 pole of the triac is connected t...

Embodiment 2

[0018] refer to figure 2 , on the basis of Example 1, in this example, the resistance R is connected in parallel at both ends of the excitation coil, and the others are the same as in Example 1. figure 2 neutralize figure 1 The same symbols have the same meaning.

Embodiment 3

[0019] Example 3, with reference to the attached image 3 .

[0020] The invention is provided with a bidirectional thyristor 12 connected in series on the secondary winding loop of the compressor motor 100, the T2 pole of the bidirectional thyristor 12 is connected to the power input neutral line terminal N, and the T1 pole is connected to the S terminal of the secondary winding.

[0021] The starter is also connected with the normally open reed switch RI and the positive temperature coefficient thermistor R in series between the control pole 3 of the triac and the neutral end N of the power input. t , the excitation coil 14 of the normally open reed switch is also connected in series on the circuit of the main winding of the compressor motor.

[0022] The thermistor R t Ordinary metal film resistors can also be used. Positive temperature coefficient thermistor R t The thermistor may be a milliamp level, which may be 1 mA to 100 mA.

[0023] Reference numeral 13 is a the...

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Abstract

The invention provides a novel zero-power PTC starter for a small refrigerating compressor. The novel zero-power PTC starter is provided with a PTC positive temperature coefficient thermistor which is connected to a loop of a motor secondary winding of the compressor in series, wherein a bidirectional triode thyristor is connected between the first end of the thermistor and the S end of the secondary winding in turn; and a normally open reed switch and the positive temperature coefficient thermistor Rt which are connected with each other in series are arranged between the control electrode of the bidirectional triode thyristor and an input zero line end of a power supply. In the invention, a starting current of a motor main winding of the refrigerating compressor serves as an exciting current of the normally open reed switch and a normally open contact of the reed switch is closed instantly when the motor is started; a trigger current is applied to the control electrode of the bidirectional triode thyristor through the thermistor Rt so that the bidirectional triode thyristor is electrified and then the motor of the compressor is started; and after the starting is finished, the contact of the reed switch is disconnected, the control current disappears from the control electrode, the thyristor is stopped and the current of the motor secondary winding is zero.

Description

technical field [0001] The present invention relates to starters for small refrigeration compressors. Background technique [0002] The small fully enclosed refrigeration compressor does not need the auxiliary winding to participate in the work after starting. The ideal state is that the auxiliary winding circuit is disconnected after the compressor is started, so that the auxiliary winding no longer consumes electricity. In this regard, the commonly used solution at present is to connect a PTC positive temperature coefficient thermistor in series in the secondary winding loop. Its resistance is extremely small at the moment when the compressor starts, and it heats up rapidly when the compressor is started, making its resistance sharp. Increase, the passing current is extremely small, so after the compressor is started, the secondary winding circuit is approximately disconnected. Even so, in order to maintain its temperature and keep high resistance value when the compresso...

Claims

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Application Information

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IPC IPC(8): H02P1/42
Inventor 陈荣泉郭锋
Owner 吴更武
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