CN113206620B - Series excited machine brake control circuit with mechanical switch and time-delay brake - Google Patents
Series excited machine brake control circuit with mechanical switch and time-delay brake Download PDFInfo
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- CN113206620B CN113206620B CN202110538899.2A CN202110538899A CN113206620B CN 113206620 B CN113206620 B CN 113206620B CN 202110538899 A CN202110538899 A CN 202110538899A CN 113206620 B CN113206620 B CN 113206620B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
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Abstract
The invention provides a series excited machine brake control circuit with a mechanical switch and a time delay brake, which comprises: MCU, the switch that uncaps, the silicon controlled rectifier, relay and series excited machine, wherein the series excited machine is controlled by silicon controlled rectifier and relay series respectively, and silicon controlled rectifier and relay correspond respectively and are provided with silicon controlled rectifier control circuit and relay control circuit and control, and the switch that uncaps is connected with silicon controlled rectifier control circuit and relay control circuit respectively, MCU respectively with uncap switch, silicon controlled rectifier control circuit and relay control circuit connection. This string excitation motor brake control circuit of band mechanical switch and delay brake is fine has used the function of the switch of uncapping, has avoided too high brake current automatically again, has practiced thrift drive circuit's cost, has satisfied the safety regulation requirement, can satisfy the requirement of motor outage, and the emergency braking can not cause too high brake current again to need not to increase extra MCU and carry out the state demonstration, safe and reliable and practiced thrift the cost.
Description
Technical Field
The invention relates to a series motor brake control circuit, in particular to a series motor brake control circuit with a mechanical switch and a time delay brake.
Background
Along with the improvement of quality of life, people pay more and more attention to the health preserving, the mixer also should need and give birth to, make things convenient for people to stir food such as beans, fruit, meat, the mixer also has certain danger when giving people ' S convenience, must accord with relevant regulation requirement in the design, one of them requirement, uncap at the during operation, the motor can ensure to cut off the power supply and do not work to in the stall in 1.5S, must guarantee that the staff can't touch the blade that turns to, guarantee user ' S safety.
In order to meet the requirements of the regulations, the stirrer is provided with a mechanical switch capable of cutting off the power and a series excitation motor with a braking function. The traditional methods include the following steps:
1) the mechanical switch directly cuts off the strong current to meet the power-off requirement of the motor, but the switch is required to have larger current, so that the structural design is inconvenient, the product is not attractive, large electric arc is easy to generate when the cover is opened due to too large current, the switch is easy to damage, and the reliability is poor;
2) the power supply voltage of the relay is directly cut off to achieve the purpose of power failure, but in the using process, when the motor works, the condition of loosening of the trigger switch is easy to trigger, the relay is repeatedly cut off and sucked, the relay is easy to damage, and the service life does not meet the preset requirement
3) The system circuit of the single chip microcomputer is directly cut off, the method can directly cut off the working voltage of the motor, and is reliable, but has the defects that: after power failure, the brake is equivalent to emergency braking, larger brake current is easy to generate, a large cement resistor needs to be added in a brake loop to reduce the brake current, the contact of the relay is prevented from being damaged by overhigh brake current, the required PCB area is increased, and the cost is increased;
in addition, many customers still can display corresponding states after the cover is opened, because the whole MCU circuit is powered off in the former measure, the state display can not be carried out any more, and in order to meet the requirement, one more MCU has to be added for state display, which also causes the cost increase.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the series motor brake control circuit with the mechanical switch and the time delay brake, which can meet the requirement of motor power failure, can not cause overhigh brake current when in emergency braking, does not need to increase an additional MCU (microprogrammed control unit) for state display, is safe and reliable and saves the cost.
In order to realize the technical scheme, the invention provides a series motor brake control circuit with a mechanical switch and a time delay brake, which comprises: MCU, the switch that uncaps, the silicon controlled rectifier, relay and series excited machine, wherein the series excited machine is controlled by silicon controlled rectifier and relay series respectively, and silicon controlled rectifier and relay correspond respectively and are provided with silicon controlled rectifier control circuit and relay control circuit and control, and the switch that uncaps is connected with silicon controlled rectifier control circuit and relay control circuit respectively, MCU respectively with uncap switch, silicon controlled rectifier control circuit and relay control circuit connection.
Preferably, the thyristor control circuit comprises resistors R19, R20, R22 and R42, a thyristor TR1, an anti-interference capacitor CX3, and a circuit board PC2, wherein a first terminal pin of the thyristor TR1 is connected with a pin 6 of the circuit board PC2, a second terminal pin of the thyristor TR1 is connected with a live wire in an AC circuit, a third terminal pin of the thyristor TR1 is connected with a series motor MOT, a first terminal pin of the anti-interference capacitor CX3 is connected with a second terminal pin of the thyristor TR1, a second terminal pin of the anti-interference capacitor CX3 is connected with a first terminal pin of a resistor R19, a second terminal pin of the resistor R19 is connected with a third terminal pin of the thyristor TR1, a first terminal pin of the resistor R22 is connected with a pin 4 of the circuit board PC2, a second terminal pin of the resistor R22 is connected with a second terminal pin of the thyristor TR1, a first terminal pin of a resistor R20 is connected with a pin 1 of the circuit board PC2, a second terminal pin of the resistor R20 is connected with an output terminal I/O port of the MCU, the first terminal pin of the resistor R42 is connected with the second terminal pin of the resistor R20 and the I/O port of the MCU respectively, the second terminal pin of the resistor R42 is connected with the first terminal pin of the uncovering switch SW1 and the 5V voltage respectively, and the second terminal pin of the uncovering switch SW1 is connected with the 5V power supply.
Preferably, the anti-interference capacitor CX3 and the resistor R19 are connected with the thyristor TR1 to form an RC protection circuit.
Preferably, the relay control circuit includes resistors R26, R27, R37, diodes D5, D6, D7, a transistor Q1, and a relay, wherein a first terminal pin of the diode D5 is connected to pins 1 and 12V of the relay, a second terminal pin of the diode D5 is connected to pin 2 of the relay and a collector of the transistor Q1, an emitter of the transistor Q1 is grounded, a base of the transistor Q1 is connected to a first terminal pin of the resistor R26 and a first terminal pin of the transistor R27, a second terminal pin of the resistor R26 is connected to a first terminal pin of a capacitor C7 and a first terminal pin of the diode D7, a second terminal pin of the capacitor C7 is connected to an emitter of the transistor Q7, a second terminal pin of the diode D7 is connected to the first terminal pin of the diode D7, a second terminal pin of the diode D7 is connected to the emitter of the transistor Q7, and a second terminal pin of the diode D7 is connected to the ground, and a second terminal pin of the diode D7 is connected to the second terminal pin of the transistor Q7, and a second terminal pin of the diode D7 is connected to the second terminal pin of the diode D7, and a second terminal pin of the diode D7 is connected to the second terminal pin of the transistor D7, and a ground, and a second terminal pin of the transistor D7 is connected to the second terminal pin of the transistor D7 is connected to the second terminal pin of the transistor D7, and a second terminal pin of the transistor D7 is connected to the second terminal pin of the transistor D7, and a second terminal pin of the transistor D7 is connected to the second terminal pin of the transistor D7, and a second terminal pin of the transistor D7 is connected to the transistor D7, and a ground, and a second terminal pin of the transistor D7 is connected to the second terminal pin of the transistor D7, and a collector of the second terminal pin of the transistor D7, and the second terminal pin of the transistor D7 is connected to the second terminal pin of the transistor D7, and a terminal pin of the transistor D7 is connected to the second terminal pin of the transistor D7, and the transistor The second end pin of the capacitor C6 is connected with the I/O port of the MCU and the first end pin of the resistor R37 respectively, the second end pin of the resistor R37 is connected with 5V voltage, and the pin 3, the pin 4, the pin 6, the pin 7 and the pin 8 on the relay are correspondingly connected with the series motor MOT respectively.
Preferably, a pin 3 and a pin 6 on the relay are connected in series and then connected with a yellow wiring of the series motor MOT, a pin 4 on the relay is connected with a red wiring of the series motor MOT, a pin 5 on the relay is connected with an AC power supply, a pin 7 on the relay is connected with a white wiring of the series motor MOT, and a pin 8 on the relay is connected with a blue wiring of the series motor MOT.
The brake control circuit of the series motor with the mechanical switch and the time delay brake, provided by the invention, has the beneficial effects that: this string excitation motor brake control circuit of band mechanical switch and delay brake is fine has used the function of the switch of uncapping, has avoided too high brake current automatically again, has practiced thrift drive circuit's cost, has satisfied the safety regulation requirement, can satisfy the requirement of motor outage, and the emergency braking can not cause too high brake current again to need not to increase extra MCU and carry out the state demonstration, safe and reliable and practiced thrift the cost.
Drawings
Fig. 1 is a control schematic diagram of the present invention.
FIG. 2 is a circuit diagram of the thyristor control circuit of the present invention.
Fig. 3 is a circuit diagram of a relay control circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
The embodiment is as follows: a series excited motor brake control circuit with a mechanical switch and a time delay brake.
Referring to fig. 1 to 3, a brake control circuit of a series motor with a mechanical switch and a time-delay brake includes: MCU, the switch that uncaps, the silicon controlled rectifier, relay and series excited machine, wherein the series excited machine is controlled by silicon controlled rectifier and relay series respectively, and silicon controlled rectifier and relay correspond respectively and are provided with silicon controlled rectifier control circuit and relay control circuit and control, and the switch that uncaps is connected with silicon controlled rectifier control circuit and relay control circuit respectively, MCU respectively with uncap switch, silicon controlled rectifier control circuit and relay control circuit connection.
The principle of the electrical structure of the series motor brake control circuit with the mechanical switch and the time delay brake is shown in figure 1, and the correct time sequence of the series motor brake is as follows: the AC power is disconnected by the thyristor, and then the relay contact is released to form a closed reverse brake loop, so that the brake function is realized; the series motor is controlled by a thyristor and a relay in series respectively, and the thyristor and the relay are controlled by corresponding control circuits.
The circuit diagram of the thyristor control circuit is shown in fig. 2, and comprises resistors R19, R20, R22 and R42, a thyristor TR1, an anti-interference capacitor CX3 and a circuit board PC2, wherein a first terminal pin of the thyristor TR1 is connected with a pin 6 of the circuit board PC2, a second terminal pin of the thyristor TR1 is connected with a live wire in an AC circuit, a third terminal pin of the thyristor TR1 is connected with a series motor MOT, a first terminal pin of the anti-interference capacitor CX3 is connected with a second terminal pin of the thyristor TR1, a second terminal pin of the anti-interference capacitor CX3 is connected with a first terminal pin of the resistor R19, a second terminal pin of the resistor R19 is connected with a third terminal pin of the thyristor TR1, a first terminal pin of the resistor R22 is connected with a pin 4 of the circuit board PC2, a second terminal pin of the resistor R22 is connected with a third terminal pin of the thyristor TR1, a first terminal pin of the resistor R20 is connected with a pin of the circuit board PC2, and a second terminal pin of the MCU 20 is connected with a pin/O pin of the MCU 20, the I/O port of the MCU is set to be open-drain output, the first end pin of the resistor R42 is connected with the second end pin of the resistor R20 and the I/O port of the MCU respectively, the second end pin of the resistor R42 is connected with the first end pin of the uncovering switch SW1 and 5V voltage respectively, and the second end pin of the uncovering switch SW1 is connected with the 5V power supply. The anti-interference capacitor CX3 and the resistor R19 are connected with the controlled silicon TR1 to form an RC protection circuit. The resistor R42 is used as a pull-up resistor of the MCU, the key effect is played on driving the controlled silicon TR1, an I/O port corresponding to the MCU is set to be output in a leakage mode, driving current completely depends on the pull-up resistor R42 to provide current, 5V voltage connected with the pull-up resistor R42 is controlled by the cover opening switch SW1, when the cover opening switch SW1 is opened, the resistor R42 is disconnected with the 5V power supply, the MCU loses driving capability, the controlled silicon TR1 is immediately turned off, and meanwhile the MCU can detect signals and conduct corresponding control action. The cover opening switch SW1 achieves the purpose of turning off the silicon controlled rectifier, meanwhile, the MCU does not need to be powered off, corresponding warning state display can be carried out, a new single chip microcomputer does not need to be additionally added, and cost is saved.
The circuit diagram of the relay control circuit is shown in fig. 3, and comprises resistors R26, R27, R37, diodes D5, D6, D7, a transistor Q1, and a relay, wherein a first terminal pin of the diode D5 is respectively connected with pins 1 and 12V of the relay, a second terminal pin of the diode D5 is respectively connected with pin 2 of the relay and a collector of the transistor Q1, an emitter of the transistor Q1 is grounded, a base of the transistor Q1 is respectively connected with a first terminal pin of the resistor R26 and a first terminal pin of the transistor R27, a second terminal pin of the resistor R26 is respectively connected with a first terminal pin of the capacitor C7 and a first terminal pin of the diode D6, a second terminal pin of the capacitor C7 is connected with an emitter of the transistor Q1, a second terminal pin of the transistor R27 is connected with an emitter of the transistor Q1, a second terminal pin of the diode D6 is connected with a first terminal pin of the diode D7, a second terminal pin of the diode D7 is connected with an emitter of the transistor Q1, the first end pin of electric capacity C6 is connected on the connecting wire of diode D6 second end pin and diode D7 first end pin, the second end pin of electric capacity C6 is connected with MCU's IO mouth and resistance R37's first end pin respectively, resistance R37's second end pin and 5V voltage are connected, pin 3 and pin 6 on the relay are connected with the yellow wiring of series excited machine MOT after establishing ties, pin 4 on the relay is connected with the red wiring of series excited machine MOT, pin 5 on the relay is connected with the AC power supply, pin 7 on the relay is connected with the white wiring of series excited machine MOT, pin 8 on the relay is connected with the blue wiring of series excited machine MOT. The 5V voltage connected with the pull-up resistor R37 is controlled by a cover opening switch SW1, an I/O port of the MCU is set to be open-drain output, the resistor R37 provides driving current for the MCU, MCU driving signals charge a capacitor C7 through C6 and D6 and maintain high level, and a triode Q1 is driven to be conducted, so that a relay is driven; when the cover opening switch SW1 is opened, the resistor R37 and the 5V power supply are disconnected, the MCU loses the capacity of driving the relay, the electric quantity is stored in the capacitor C7 and cannot be immediately released, when the voltage of the capacitor C7 is discharged to be lower than the low level 0.7V through the resistor, the relay is released, and the discharging time of the C7 is the time for delaying braking. The circuit realizes the function of opening the cover switch SW1 to release the relay in a delayed way, and automatically avoids the overhigh peak current caused by emergency braking from hardware.
The working control principle of the series excited machine brake control circuit with the mechanical switch and the time delay brake is as follows:
(1) under normal conditions, the uncovering switch SW1 is closed, and the MCU can normally control the working states of the controllable silicon and the relay;
(2) when the cover opening switch SW1 is opened, the MCU loses the control capability of the silicon controlled rectifier and the relay immediately from the hardware circuit, the silicon controlled rectifier is firstly disconnected, then the relay is disconnected (due to the hardware automatic delay circuit), the very high brake current caused by simultaneous action is avoided, the automatic brake action is realized, meanwhile, the MCU can immediately monitor whether the switch is disconnected, and relevant subsequent operations are carried out after the disconnection;
(3) under the condition of automatic shutdown, the cover opening switch is not disconnected, the MCU can firstly close the control silicon and then close the relay to perform actions of power-off and braking of the motor.
The key point of the brake control circuit of the series motor with the mechanical switch and the delay brake is that a driving I/O port of the MCU is set to be in an open-drain driving output mode, the driving capability of the I/O depends on external pull-up resistors R37 and R42, and the key point of the automatic delay circuit is in a charge-discharge mode of a C7 capacitor.
This string excitation motor brake control circuit of band mechanical switch and delay brake is fine has used the function of the switch of uncapping, has avoided too high brake current automatically again, has practiced thrift drive circuit's cost, has satisfied the safety regulation requirement, can satisfy the requirement of motor outage, and the emergency braking can not cause too high brake current again to need not to increase extra MCU and carry out the state demonstration, safe and reliable and practiced thrift the cost.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (3)
1. The utility model provides a take series excited machine brake control circuit of mechanical switch and delay brake which characterized in that includes: the system comprises an MCU, a cover opening switch, a thyristor, a relay and a series motor, wherein the series motor is respectively controlled by the thyristor and the relay in series, the thyristor and the relay are respectively and correspondingly provided with a thyristor control circuit and a relay control circuit for control, the cover opening switch is respectively connected with the thyristor control circuit and the relay control circuit, and the MCU is respectively connected with the cover opening switch, the thyristor control circuit and the relay control circuit; the controllable silicon control circuit comprises resistors R19, R20, R22 and R42, a controllable silicon TR1, an anti-interference capacitor CX3 and a circuit board PC2, wherein a first end pin of the controllable silicon TR1 is connected with a pin 6 of the circuit board PC2, a second end pin of the controllable silicon TR1 is connected with a live wire in an AC circuit, a third end pin of the controllable silicon TR1 is connected with a series motor MOT, a first end pin of the anti-interference capacitor CX3 is connected with a second end pin of the controllable silicon TR1, a second end pin of the anti-interference capacitor CX3 is connected with a first end pin of a resistor R19, a second end pin of the resistor R19 is connected with a third end pin of the controllable silicon TR1, a first end pin of the resistor R22 is connected with a pin 4 of the circuit board PC2, a second end pin of the resistor R22 is connected with a third end pin of the controllable silicon TR1, a first end pin of a resistor R20 is connected with a pin 1 of the circuit board PC2, a second end pin of the resistor R24 is connected with an I/O port of the MCU 20, and an output port of the MCU I/O port is set as an MCU, a first terminal pin of the resistor R42 is respectively connected with a second terminal pin of the resistor R20 and an I/O port of the MCU, a second terminal pin of the resistor R42 is respectively connected with a first terminal pin of the uncovering switch SW1 and 5V voltage, and a second terminal pin of the uncovering switch SW1 is connected with the 5V power supply; the relay control circuit comprises resistors R26, R27 and R37, diodes D5, D6 and D7, a triode Q1 and a relay, wherein a first terminal pin of a diode D5 is respectively connected with a pin 1 and a 12V power supply of the relay, a second terminal pin of a diode D5 is respectively connected with a pin 2 of the relay and a collector of a triode Q1, an emitter of the triode Q1 is grounded, a base of the triode Q1 is respectively connected with a first terminal pin of a resistor R26 and a first terminal pin of the R27, a second terminal pin of a resistor R26 is respectively connected with a first terminal pin of a capacitor C7 and a first terminal pin of a diode D7, a second terminal pin of the capacitor C7 is connected with an emitter of the triode Q7, a second terminal pin of the R7 is connected with an emitter of the triode Q7, a second terminal pin of the diode D7 is connected with a first terminal pin of the diode D7, a second terminal pin of the diode D7 is connected with an emitter of the Q7, and a second terminal pin of the diode D7 is connected with a ground, and a second terminal pin of the diode D7 is connected with a second terminal pin of the second terminal 7 of the second diode D7 is connected with a second terminal of the second diode D7, the second terminal pin of the capacitor C6 is respectively connected with the I/O port of the MCU and the first terminal pin of the resistor R37, the second terminal pin of the resistor R37 is connected with 5V voltage, and the pin 3, the pin 4, the pin 6, the pin 7 and the pin 8 on the relay are respectively and correspondingly connected with the series motor MOT.
2. The series motor brake control circuit with mechanical switch and time delay brake of claim 1, wherein: the anti-interference capacitor CX3 and the resistor R19 are connected with the controllable silicon TR1 to form an RC protection circuit.
3. The series motor brake control circuit with mechanical switch and time delay brake of claim 1, wherein: pin 3 and pin 6 on the relay are connected with the yellow wiring of series excited machine MOT after establishing ties, and pin 4 on the relay is connected with the red wiring of series excited machine MOT, and pin 5 on the relay is connected with the AC power, and pin 7 on the relay is connected with the white wiring of series excited machine MOT, and pin 8 on the relay is connected with the blue wiring of series excited machine MOT.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110538899.2A CN113206620B (en) | 2021-05-18 | 2021-05-18 | Series excited machine brake control circuit with mechanical switch and time-delay brake |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110538899.2A CN113206620B (en) | 2021-05-18 | 2021-05-18 | Series excited machine brake control circuit with mechanical switch and time-delay brake |
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| CN113206620A CN113206620A (en) | 2021-08-03 |
| CN113206620B true CN113206620B (en) | 2022-06-21 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201939A (en) * | 2014-08-19 | 2014-12-10 | 深圳市朗特电子有限公司 | Control system of AC (alternate current) motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7389392B2 (en) * | 2004-11-05 | 2008-06-17 | Knapp Benjamin P | Chip processors with integrated I/O |
| CN206379899U (en) * | 2016-10-12 | 2017-08-04 | 广东美的生活电器制造有限公司 | A kind of household electrical appliance of circuit for controlling motor and the application circuit |
| CN209883919U (en) * | 2019-03-06 | 2020-01-03 | 浙江绍兴苏泊尔生活电器有限公司 | Food processor control circuit and food processor |
| CN111726041A (en) * | 2019-03-21 | 2020-09-29 | 深圳拓邦股份有限公司 | Series excited motor control circuit and stirring device |
| CN214799332U (en) * | 2021-05-18 | 2021-11-19 | 中山市科卓尔电器有限公司 | Series excited machine brake control circuit with mechanical switch and time-delay brake |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201939A (en) * | 2014-08-19 | 2014-12-10 | 深圳市朗特电子有限公司 | Control system of AC (alternate current) motor |
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Address after: Building A, No. 27 Hongji Road, Minle Community, Dongfeng Town, Zhongshan City, Guangdong Province, 528425 Patentee after: ZHONGSHAN KEZHUOER ELECTRICAL APPLIANCE Co.,Ltd. Address before: 528425 Building A, 60 Dongfu Fourth Road, Jichang Village, Dongfeng Town, Zhongshan City, Guangdong Province Patentee before: ZHONGSHAN KEZHUOER ELECTRICAL APPLIANCE Co.,Ltd. |
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