Electronic starter circuit

Abstract

An electronic starter circuit belongs to the technical field of refrigeration compressor motor starting. Comprising a first positive temperature coefficient thermistor PTC1, a second positive temperature coefficient thermistor PTC2 and a bidirectional silicon controlled rectifier T. A first pole T1 of the bidirectional silicon controlled rectifier T is connected with a motor secondary winding leading-out end S. A second pole T2 of the bidirectional silicon controlled rectifier T is connected with one end of the first positive temperature coefficient thermistor PTC1. A trigger electrode G of the bidirectional silicon controlled rectifier T is connected with one end of the second positive temperature coefficient thermistor PTC2, the other end of the first positive temperature coefficient thermistor PTC1 and the other end of the second positive temperature coefficient thermistor PTC2 are jointly connected with a leading-out end M of a main winding and a secondary winding of the motor, and a capacitor C1 is connected between a first electrode T1 of the bidirectional silicon controlled rectifier T and the trigger electrode G. The advantages are that the anti-interference capability of the bidirectional silicon controlled rectifier T is increased, and the working reliability of the motor is improved; components are few, the circuit is simple, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of refrigeration compressor motor starting, specifically relates to an electronic starter circuit. BACKGROUND

[0002] At present, most of the refrigeration compressors adopt single-phase alternating current motor, which is usually composed of rotor and stator, the stator has main and auxiliary two groups of windings, the main winding is also called working winding, which is used to realize the starting and steady operation of the motor, the auxiliary winding is also called starting winding, which only works in the starting stage and is used to assist the starting of the motor. At present, the refrigeration compressor mainly adopts the mode of capacitor starting, because the compressor motor does not need the auxiliary winding to work after the starting is completed, and the power consumption of the current in the auxiliary winding after the starting is completed is mostly invalid power consumption, therefore, the ideal state is that the auxiliary winding circuit is disconnected after the starting of the compressor motor, and the current flowing through the auxiliary winding is reduced as much as possible to reduce the power loss. For this, the commonly used solution in the industry is to connect the motor starter in series in the starting circuit of the compressor, and the motor starter is usually realized by a positive temperature system thermistor (hereinafter referred to as PTC thermistor).

[0003] There are many technical information about motor starter in the published Chinese patent documents, the Chinese patent for invention authorized publication No. CN101800503B discloses an electronic starter for refrigeration compressor, which comprises a shell, a cover plate, a first pin, a second pin, a first reed, a second reed, a third reed, a fourth reed, a bidirectional thyristor, a first positive temperature coefficient thermistor and a second positive temperature coefficient thermistor, in the scheme, the first positive temperature coefficient thermistor is connected with the second pole of the bidirectional thyristor, the second positive temperature coefficient thermistor is connected with the trigger pole of the bidirectional thyristor, when the motor starts, the trigger signal flows through the second positive temperature coefficient thermistor and the bidirectional thyristor trigger pole, so that the bidirectional thyristor is turned on, and the starting current passes through the first positive temperature coefficient thermistor to connect the motor auxiliary winding, after the motor starts, the resistance of the first positive temperature coefficient thermistor increases continuously, thereby reducing the current flowing through the auxiliary winding, at the same time, the resistance of the second positive temperature coefficient thermistor also increases continuously, finally resulting in the current flowing through the bidirectional thyristor trigger pole decreasing and disconnecting the bidirectional thyristor, at this time, there is no current passing through the first positive temperature coefficient thermistor, only the second positive temperature coefficient thermistor maintains the current, thereby avoiding the waste of electric energy and realizing the "low power consumption" of the starter. But in the above-mentioned circuit structure, the trigger pole loop of the bidirectional thyristor has weak anti-interference ability, in the running process of the motor, the trigger loop will receive interference signals of the power grid or other devices, the instantaneous interference signals will make the bidirectional thyristor conduct for a short time, causing the auxiliary winding to be electrified for a short time, so that the motor runs abnormally. The existence of the interference signal will have a certain influence on the working stability of the motor, therefore, the applicant has made beneficial design to solve the above technical problems, and the technical scheme to be introduced below is generated in this background. Practical new type content

[0004] The utility model discloses a kind of electronic starter circuits with few components, simple circuit and strong anti-interference ability.

[0005] The utility model discloses a kind of electronic starter circuits with few components, simple circuit and strong anti-interference ability.

[0006] In one specific embodiment of the utility model, the capacitance of the capacitor C1 is 0.01-1 .

[0007] The utility model discloses a capacitor C1 is connected between the first pole T1 and trigger pole G of bidirectional thyristor T, compared with prior art, has the beneficial effect is: when the interference signal exists in the circuit, the capacitor C1 provides a low impedance discharge path, can effectively avoid interference signal into bidirectional thyristor T to trigger pole G of bidirectional thyristor T and mis-trigger, increase the anti-interference ability of bidirectional thyristor T, improve the working reliability of motor, few components, simple circuit, low in cost, the whole circuit power consumption is low. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is the electric connection schematic drawing of the utility model. DETAILED DESCRIPTION

[0009] The specific embodiment of the utility model is described in detail below in combination with the drawings, but the description of the embodiment is not the limitation of the technical scheme, and any change of form but not substance according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0010] In the following description, the concepts of directionality (or orientation) of up, down, left, right, front and back are all in the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as a special limitation on the technical scheme provided by the utility model.

[0011] See Figure 1 The utility model relates to an electronic starter circuit for starting the motor of a refrigeration compressor. In the figure, the connection point N and the connection point L are the power input terminals, M is the motor main winding lead-out terminal, S is the motor auxiliary winding lead-out terminal, and C is the motor main and auxiliary winding combined lead-out terminal.

[0012] The utility model discloses a first positive temperature coefficient thermistor PTC1, second positive temperature coefficient thermistor PTC2 and bidirectional thyristor T. The first pole T1 of bidirectional thyristor T is connected with motor auxiliary winding lead-out terminal S, one end of the second pole T2 of bidirectional thyristor T is connected with one end of first positive temperature coefficient thermistor PTC1, the trigger pole G of bidirectional thyristor T is connected with one end of second positive temperature coefficient thermistor PTC2, the other end of first positive temperature coefficient thermistor PTC1, the other end of second positive temperature coefficient thermistor PTC2 and motor main and auxiliary winding lead-out terminal M are connected with power terminal N in common, and motor main and auxiliary winding combined lead-out terminal C is connected with power terminal L through protector B.

[0013] The utility model discloses an improvement lies in, in order to improve the anti -interference ability of bidirectional thyristor T, connect the capacitor C1 as by -pass capacitor between the first pole T1 and trigger pole G of bidirectional thyristor T. Specifically, one end of capacitor C1 is connected with the first pole T1 of bidirectional thyristor T and motor auxiliary winding lead -out end S, and the other end of capacitor C1 is connected with the trigger pole G of bidirectional thyristor T and one end of second positive temperature coefficient thermistor PTC2. Preferably, the capacitance of capacitor C1 is 0.01-1 .

[0014] When the interference signal exists in the circuit, the capacitor C1 provides a low impedance discharge path, which can effectively prevent the interference signal from entering the bidirectional thyristor T, so that the trigger pole G of the bidirectional thyristor T does not appear false triggering, the anti-interference ability of the trigger pole G is realized, the working reliability of the motor is improved, and the purpose of the application is achieved.

Claims

1. An electronic starter circuit comprising a first positive temperature coefficient thermistor (PTC1), a second positive temperature coefficient thermistor (PTC2) and a triac (T), the first terminal (T1) of the triac (T) being connected to the secondary winding terminal (S) of the motor, the second terminal (T2) of the triac (T) being connected to one end of the first positive temperature coefficient thermistor (PTC1), the gate (G) of the triac (T) being connected to one end of the second positive temperature coefficient thermistor (PTC2), the other end of the first positive temperature coefficient thermistor (PTC1) and the other end of the second positive temperature coefficient thermistor (PTC2) being connected together to the main winding terminal (M) of the motor, characterized in that: The first pole T1 of the bidirectional thyristor T is connected with the trigger pole G through a capacitor C1.

2. An electronic starter circuit according to claim 1, characterized in that: The capacitance C1 is 0.01-1 .

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