CN2627731Y

CN2627731Y - Power adjustable soft starting circuit control device

Info

Publication number: CN2627731Y
Application number: CN 03222375
Authority: CN
Inventors: 沈日柳
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-05-29
Filing date: 2003-05-29
Publication date: 2004-07-21
Anticipated expiration: 2013-05-29

Abstract

The utility model relates to a device for controlling the electromagnetic compatibility generated by an electromotor. The device comprises a changeover switch, a soft startup circuit, and a trigger circuit, wherein the changeover switch is synchronically linked with a potentiometer, when the active end of the potentiometer is at the low end, the changeover switch will be communicated with the low end of the electromotor, and when the active end of the potentiometer is at the high end, the changeover switch will be communicated with the high end of the electromotor, so as to conveniently and effectively achieve the purpose of controlling electromotor using a single silicon controlled rectifier, prevent the complex programming and reduced reliability problems brought by using a single chip microcomputer, simplify the circuit structure, effectively reduce production cost, and solve the electric network pollution problem by the electromagnetic compatibility induced by household appliances.

Description

A kind of power-adjustable soft starting circuit control device

Technical field

The utility model relates to the device that a kind of electromagnetic compatibility that motor is produced is controlled, particularly a kind of device of controlling the two stator motors generation of single phase alternating current (A.C.) carbon brush commutator series excitation electromagnetic compatibility.

Technical background

Because being extensive use of of electric energy, emerge as the spring bamboo behind the various small household appliances elephantas, when the life of giving people brings convenience, follow extremely then be increasing electromagnetic interference problem, its puzzlement and restricting the development of household appliances enterprise and the exploitation of new product.Especially dust catcher class household electrical appliance, it has adopted silicon-controlled device in speed governing power process, in nonlinear electric energy conversion, electrical network has been introduced a large amount of harmonic currents, make not only that other power consumption equipments are interfered in the same electrical network, produce fault, also can make the current in middle wire overload of electrical network, influence ability to transmit electricity.In addition,, can cause that the effective value of electric current changes, can cause the effective voltage of load-side to produce fluctuation, cause that lighting produces flicker, the spiritual aspect disease of inducing the mankind to produce because of visual discomfort to the phase control of power supply.

The TC77 committee of International Electrotechnical Commission (1EC) has formulated the standard (1EC61000-3 series standard) of many this respects, it is to estimate 16 amperes of power consumption equipments grid supply quality is influenced that two standards are wherein arranged, and one is IEC61000-3-2 (1995) " electromagnetic compatibility third part: limit value; Chapter 2: the caused harmonic wave electric wave of the low voltage equipment of every phase rated current≤16A equipment sends limit value "; Another is IEC61000-3-3 (1994) " electromagnetic compatibility third part: limit value; Chapter 3: in low-voltage power supply system, the voltage fluctuation of rated current≤16A equipment and flicker limit value ".More than two standards changed into the national standard of China with being equal to, standard No. is: GB17625.1-1998 and GB17625.2-1999.The Electrical and Electronic product that relates to owing to these two standards is numerous, and is seen as compulsory execution from the standard numbering, so relevant enterprise all can not adopt a casual attitude.

Usually small household appliances, especially dust catcher, power be greater than 1200W when above, harmonic current and voltage fluctuation often be difficult to the to be up to state standards limit value of defined.And the two stator motors of single phase alternating current (A.C.) carbon brush commutator series excitation are to extract a centre cap from the single stator motor enamelled wire of single phase alternating current (A.C.) carbon brush commutator series excitation winding to increase the two stator motors of single phase alternating current (A.C.) carbon brush commutator series excitation that a stator arises at the historic moment, the purpose of two stator motors mainly is to be divided into two groups of power, that is: 1200W or 1300W, with 1600W or 1800W or 2000W, and 1200W or 1300W are the starting power from product in speed regulation process, power bracket is continuously adjustable, be that 1W is to 1200W or 1300W, design become for the continuously adjustable reason of this power bracket mainly be that harmonic current and voltage fluctuation are than a reason that is easier to by the prescribed by standard limit value, and the high power 1600W of another stator or 1800W or 2000W, its harmonic current often also is the requirement that reaches standard code easily, if 1200W or 1300W are continuous power-adjustable scopes to the power between 1600W or 1800W or the 2000W, its harmonic current can't pass through harmonic current limit value standard.So the two stator motors of utilization just can be avoided 1200W or 1300W satisfy harmonic current to the power section between 1600W or 1800W or the 2000W limit value requirement.

At present, cause that at the solution household electrical appliance electromagnetic compatibility pollutes on the problem of electrical network, generally all adopt above-mentioned pair of stator motor to avoid the scheme of a certain power section, its method is: adopt singlechip technology in control circuit, by being set, the high-low level pulse signal divide two output pins of two groups of signals to trigger two bidirectional triode thyristors respectively, control the two stator motors of single phase alternating current (A.C.) carbon brush commutator series excitation by these two bidirectional triode thyristors, thereby reach the purpose of power transfer.Because the main electronic component that this solution is used is single-chip microcomputer and two bidirectional triode thyristors etc., therefore, mcu programming is more loaded down with trivial details, and circuit structure is relatively complicated, and reliability reduces, and the cost of product increases.

Summary of the invention

Goal of the invention of the present utility model is to overcome the deficiency that above-mentioned prior art exists, and a kind of power-adjustable SS (soft start) control circuit device simple in structure, safe and reliable, with low cost is provided.

In order to realize goal of the invention described in the utility model, the technical scheme that adopts is: form power-adjustable soft starting circuit control device by change over switch, soft starting circuit, circuits for triggering, the common port of described change over switch is connected with an end of bidirectional triode thyristor, and the The Trigger of Bidirectional Triode Thyristor end connects circuits for triggering; Change over switch is synchronoused working with the potentiometer in the circuits for triggering, and when the movable end of potentiometer was in low side, the common port of change over switch and the low side of motor were connected, and the movable end of potentiometer is in when high-end, the high-end connection of the common port of change over switch and motor.

Described soft starting circuit is composed in series by resistance, electric capacity, transistor and controllable silicon.

Therefore the utility model, only needs just can control two stator motors with single controllable silicon owing to adopted the technical scheme of change over switch and potentiometer synchronous interaction, trival matters have been avoided with mcu programming, circuit is simple, and reliability is improved, and has reduced production cost effectively.

Description of drawings

Accompanying drawing 1 is the electrical schematic diagram of two stator motors among the utility model embodiment;

Accompanying drawing 2 is circuit theory diagrams of the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further elaborated.

Embodiment:

Referring to accompanying drawing 1: the two stator motor common port C of single phase alternating current (A.C.) carbon brush commutator series excitation, (high power) end H at a high speed, low speed (low-power) end L.

Referring to accompanying drawing 2: by mains switch SW1, resistance R 1, R2, rectifier diode D1, filter capacitor C2, voltage stabilizing didoe ZD form power supply circuit; Form an adjustable speed power circuit by potentiometer VR, capacitor C 4, resistance R 6, bidirectional trigger diode D2, bidirectional triode thyristor TRA2, change over switch SW2 and motor; When solving harmonic current, voltage fluctuation is insurmountable because the power of high-grade power 1600W or 1800W or 2000W is too big, so need the utilization soft start, therefore, present embodiment composes in series soft starting circuit by resistance R 3, R4, R5, capacitor C 3, transistor Q1, controllable silicon TRA1, i.e. delay circuit.

Energized switch SW 1 through providing voltage to rectifier diode D1 rectification after resistance R 1, the R2 step-down, obtains a stable supply power voltage by voltage stabilizing didoe ZD and filter capacitor C2 and offers soft starting circuit work after rectification.In soft starting circuit, R3 and R5 are as the biasing resistor of transistor Q1, and R3 and C3 form a delay time circuit simultaneously, and resistance R 4 is then as the electric resistance of the release of capacitor C 3.The pulse signal of exporting during by transistor Q1 conducting triggers controllable silicon TRA1 work, the phase-shift circuit of forming by potentiometer VR, resistance R 6, capacitor C 4, size by regulator potentiometer, trigger the D2 conducting, change the phase angle of controllable silicon TRA2, control controllable silicon TRA2 output voltage size realizes the size of adjustable speed motor power.Change over switch SW2 in controllable silicon TRA2 pin serial connection, when potentiometer can be transferred to maximum power continuously by the low gear starting power, it is 1 when beatting up nurse that the actual resistance that is to say potentiometer slides to resistance, be that power 1W is during to 1200W or 1300W, change over switch SW2 is in public point C1 and low-power end NC2 point closure state, and just (the low-power end 1200W of motor～1300W) conductive electrode is connected for C1 point and motor L; When the actual resistance of potentiometer slides to zero resistance, change over switch SW2 is synchronoused working with potentiometer, just the potentiometer stroke is at the end resistance when being zero, at this moment change over switch SW2 becomes open-circuit condition by former C1 point and NC2 closure state, the C1 point that is right after change over switch SW2 is connected with the NC4 point is closed at once, the H of the C1 of change over switch SW2 point and motor (motor high power end＞1600W just, 1800W, 2000W) conductive electrode is connected, thereby changes the work when realizing high power 1600W or 1800W or 2000W.Capacitor C 1 in the circuit plays anti-interference effect.And when mains switch restarted, no matter power rating was to be in 1200W or 1300W or 1600W or 1800W or 2000W all to realize soft start function, thus the voltage fluctuation that solves electromagnetic compatibility effectively in (EMC).

Adjustable speed SS (soft start) control circuit device of the present utility model, the two stator motors of adapted can solve harmonic current and voltage fluctuation effectively.

Claims

1. power-adjustable soft starting circuit control device, it is characterized in that: it is made up of change over switch, soft starting circuit, circuits for triggering, the common port of described change over switch is connected with an end of bidirectional triode thyristor, and the The Trigger of Bidirectional Triode Thyristor end connects circuits for triggering; Change over switch is synchronoused working with the potentiometer in the circuits for triggering, and when the movable end of potentiometer was in low side, the common port of change over switch and the low side of motor were connected, and the movable end of potentiometer is in when high-end, the high-end connection of the common port of change over switch and motor.

2. power-adjustable soft starting circuit control device according to claim 1, it is characterized in that: described soft starting circuit is composed in series by resistance, electric capacity, transistor and controllable silicon.