CN102118029B

CN102118029B - Motor filter circuit

Info

Publication number: CN102118029B
Application number: CN2011100523903A
Authority: CN
Inventors: 曾庆清; 郑汉辉
Original assignee: SHENZHEN RUNTANG INTELLIGENT DOMESTIC APPLIANCES CO Ltd
Current assignee: Heyuan SHUNFA Electronic Technology Co., Ltd.
Priority date: 2011-03-04
Filing date: 2011-03-04
Publication date: 2013-03-20
Anticipated expiration: 2031-03-04
Also published as: CN102118029A

Abstract

The invention discloses a motor filter circuit which comprises a single chip microcomputer control circuit, an optical coupler, bidirectional controllable silicon, an inductor, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor and a motor, wherein two ports at the input side of the optical coupler are connected with two ports of the single chip microcomputer control circuit respectively; two ports at the output side of the optical coupler are connected with the first end and the control end of the bidirectional controllable silicon respectively; two ends of the inductor are connected with the second end of the bidirectional controllable silicon and the first end of an alternating current power supply respectively; two ends of the third capacitor are connected with the first end of the motor and the first end of the alternating current power supply respectively; the first end of the motor is connected with the first end of the bidirectional controllable silicon; the second end of the motor is connected with the second end of the alternating current power supply; the second resistor is connected in series with the second capacitor, and then is connected in parallel between the first end and the second end of the bidirectional controllable silicon; and both the first resistor and the second resistor are connected in parallel between the second end and the control end of the bidirectional controllable silicon. The filter circuit has a simpler structure, smaller size and a better effect.

Description

A kind of motor filter circuit

Technical field

The present invention relates to a kind of motor filter circuit.

Background technology

In the existing control technology, the motor speed adjusting technique is to use bidirectional triode thyristor as main.Usually want the speed of governor motor that two kinds of methods are arranged, the first is adjusted the angle of flow (being called for short " copped wave ") exactly, and the second is the complete sinusoidal wave number ratio (being called for short " every ripple ") of adjusting conducting.Realize easily stepless time adjustment with first method, because thyristor operating angle can carry out continuous setup by MCU control, but defective is to produce serious electromagnetic interference, relatively difficult the absorption; And the interference that second method produces is relatively less, but inconvenient during speed governing, the amplitude of adjustment is crossed conference and caused the shake of motor rotary speed instability generation.If product is tested by EMC/EMI, just must suppress the electromagnetic interference that exceeds standard.

The motor filter circuit structure of prior art is comparatively complicated, and cost is higher, and electromagnetic radiation and volume are larger.

Summary of the invention

In order to solve the problems of the technologies described above, the invention provides a kind of simple in structure, cost is lower, electromagnetic radiation is less motor filter circuit.

A kind of motor filter circuit comprises single chip machine controlling circuit, optical coupler, bidirectional triode thyristor, inductance, the first resistance, the second resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and motor; Two ports of the input side of described optical coupler are connected with two ports of described single chip machine controlling circuit respectively, and two ports of outlet side are connected with control end with the first end of described bidirectional triode thyristor respectively; Be connected first end with the second end of described bidirectional triode thyristor respectively and be connected in the two ends of described inductance with AC power; The two ends of described the 3rd electric capacity respectively with the first end of motor be connected the first end of AC power and be connected; The first end of described motor is connected with the first end of bidirectional triode thyristor; The second end of motor is connected with the second end of described AC power; Be connected in parallel on after described the second resistance and the second capacitances in series between the first end and the second end of described bidirectional triode thyristor; Described the first resistance and the second resistance all are connected in parallel between second end and control end of described bidirectional triode thyristor.

Owing to adopted technique scheme, the structure of motor filter circuit is simpler, and the shared volume of circuit is less, and filter effect is better, and electromagnetic radiation is less, and cost is lower.

Preferably, comprise testing circuit, described testing circuit comprises anti-overflow probe, the first bottom probe, the second bottom probe, temperature sensor and single-chip microcomputer; Described anti-overflow probe, the first bottom probe and the second bottom probe link to each other with an I/O mouth, the 2nd I/O mouth and the 3rd I/O mouth of described single-chip microcomputer respectively; Described temperature sensor respectively with described anti-overflow probe be connected bottom probe and be connected.

Preferably, described single-chip microcomputer is used for, and described the 2nd I/O mouth is set to output low level, reads in the voltage of described the 3rd I/O mouth or current value to judge actual water level and the relation of setting lowest water level; A described I/O mouth is set to output low level, the voltage of described the 2nd I/O mouth or current value is carried out A/D sample to obtain temperature value; Described the 3rd I/O mouth is set to output low level, and described the 2nd I/O mouth is set to input state, reads in the voltage of a described I/O mouth or current value to judge whether soya-bean milk overflows.

Adopt technique scheme, only needing three I/O mouths just to finish prior art needs four I/O mouths to the detection of anti-overflow, temperature and water level, greatly simplified the structure of circuit, reduced the probability that breaks down easily because of complex circuit, also provided cost savings simultaneously; Adaptably, utilize electric current and the electrical potential difference between the probe and corresponding I/O mouth low level or input/output state be set, finished the detection to anti-overflow, temperature and water level.

Description of drawings

Fig. 1 is a kind of specific embodiment of motor filter circuit of the present invention;

Fig. 2 is a kind of specific embodiment of bean curd machine testing circuit of the present invention.

Embodiment

Below with reference to accompanying drawing, the specific embodiment of the present invention is described in further detail.

Motor filter circuit as shown in Figure 1 comprises single chip machine controlling circuit, optical coupler OP1, bidirectional triode thyristor TR1, inductance L 1, the first resistance R 1, the second resistance R 2, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and motor M; Two ports of the input side of optical coupler OP1 are connected with two ports of single chip machine controlling circuit respectively, and two ports of outlet side are connected with control end with the first end of bidirectional triode thyristor TR1 respectively; Be connected first end ACN with the second end of bidirectional triode thyristor TR1 respectively and be connected in the two ends of inductance L 1 with AC power; Be connected first end ACN with the first end of motor M respectively and be connected in the two ends of the 3rd capacitor C 3 with AC power; The first end of motor M is connected with the first end of bidirectional triode thyristor TR1; The second end of motor M is connected with the second end ACL of AC power; Be connected in parallel between the first end and the second end of bidirectional triode thyristor TR1 after the second resistance R 2 and 2 series connection of the second capacitor C; The first resistance R 1 and the first capacitor C 1 all are connected in parallel between the second end and control end of bidirectional triode thyristor TR1.

Wherein, foregoing circuit can also comprise R3, and its two ends are connected to an end of the outlet side of the first end of TR1 and OP1, in order to the size of current of restricted passage optical coupler.

In the prior art, often adopt the inductance of mH level, the circuit volume is larger, and the present invention only need adopt the inductance of a uH level, greatly reduces the volume of motor filter circuit; Simultaneously, with in parallel with first end and the second end of bidirectional triode thyristor TR1 again after the second capacitor C 2 and 2 series connection of the second resistance R, not only make bidirectional triode thyristor TR1 can not produce misoperation, simultaneously also with inductance and the 3rd electric capacity, form filter network, the high-frequency harmonic that the continuous conducting of Single-chip Controlling TR1 and cut-off are produced has fabulous filter effect, has reduced the electromagnetic radiation of circuit, so that product more environmental protection and green.

As shown in Figure 2, motor filter circuit of the present invention also comprises the bean curd machine testing circuit, comprises single-chip microcomputer, anti-overflow probe T3, the first bottom probe T1, the second bottom probe T2 and temperature sensor NTC; Anti-overflow probe T3, the first bottom probe T1 link to each other with the 3rd I/O mouth I/O3 with an I/O mouth I/O1, the 2nd I/O mouth I/O2 of single-chip microcomputer respectively with the second bottom probe T2; Temperature sensor NTC respectively with anti-overflow probe T3 be connected bottom probe T2 and be connected.

Wherein, the first bottom probe T1 and the second bottom probe T2 are arranged on the bottom of the soybean milk cup of bean curd machine, and anti-overflow probe T3 is arranged on the top of soybean milk cup.

In a kind of more specifically embodiment, I/O1, I/O2 and I/O3 are connected with anodal VCC by two resistance R respectively, and pass through respectively a capacitor C and be connected with ground, and T1, T2 and T3 all are inserted on the socket.

When carrying out the lowest water level detection, I/O2 is set to output low level, if this moment, the first bottom probe T1 and the second bottom probe T2 were immersed in water or the soya-bean milk simultaneously, namely electrical potential difference and electric current can occur between the two, read in this voltage or current value by I/O3 and then can judge actual water level and setting on the lowest water level; Otherwise, if this moment the first bottom probe T1 and the second bottom probe T2 be not immersed in simultaneously in water or the soya-bean milk, electrical potential difference and electric current can not appear between the two, then actual water level needs reminding user or control heater stopped heating setting under the lowest water level.When the soya-bean milk in detecting soybean milk cup or the temperature of water, I/O1 is set to output low level, and the curtage of I/O2 is carried out the A/D sampling, can obtain its temperature value.When carrying out anti-overflow detection, judge namely whether the soya-bean milk in the soybean milk cup is about to overflow, I/O2 is set to input state, to prevent its level value to the impact of I/O1 mouth, I/O3 is set to output low level, reads in current value or the magnitude of voltage of I/O1, there are electrical potential difference in T1 and anti-overflow probe T3 if current value is non-vanishing or pop one's head in the first bottom, show that then water level has exceeded the peak level of setting, water namely will overflow, then reminding user, control heater stopped heating or stop to stir; If otherwise there are not electric current or electrical potential difference between the first bottom probe T1 and the anti-overflow probe T3, show that then water level does not exceed the highest designated water level, the risk of not overflowing.

Above content is the further description of the present invention being done in conjunction with concrete preferred embodiment, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims

1. a motor filter circuit comprises single chip machine controlling circuit, optical coupler, bidirectional triode thyristor, it is characterized in that: also comprise inductance, the first resistance, the second resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and motor; Two ports of the input side of described optical coupler are connected with two ports of described single chip machine controlling circuit respectively, and two ports of outlet side are connected with control end with the first end of described bidirectional triode thyristor respectively; Be connected first end with the second end of described bidirectional triode thyristor respectively and be connected in the two ends of described inductance with AC power; The two ends of described the 3rd electric capacity respectively with the first end of motor be connected the first end of AC power and be connected; The first end of described motor is connected with the first end of bidirectional triode thyristor, and the second end is connected with the second end of described AC power; Be connected in parallel on after described the second resistance and the second capacitances in series between the first end and the second end of described bidirectional triode thyristor; Described the first resistance and the first electric capacity all are connected in parallel between second end and control end of described bidirectional triode thyristor;

Also comprise the 3rd resistance, the first end of described bidirectional triode thyristor is connected with an end of the outlet side of described optical coupler by the 3rd resistance;

Also comprise testing circuit, described testing circuit comprises anti-overflow probe, the first bottom probe, the second bottom probe, temperature sensor and single-chip microcomputer; Described anti-overflow probe, the first bottom probe and the second bottom probe link to each other with an I/O mouth, the 3rd I/O mouth and the 2nd I/O mouth of described single-chip microcomputer respectively; Described temperature sensor is NTC, described NTC respectively with described anti-overflow probe be connected bottom probe and be connected;

Described single-chip microcomputer is used for, and described the 2nd I/O mouth is set to output low level, reads in the voltage of described the 3rd I/O mouth or current value to judge actual water level and the relation of setting lowest water level; A described I/O mouth is set to output low level, the voltage of described the 2nd I/O mouth or current value is carried out A/D sample to obtain temperature value; Described the 3rd I/O mouth is set to output low level, and described the 2nd I/O mouth is set to input state, reads in the voltage of a described I/O mouth or current value to judge whether soya-bean milk overflows.