CN110063670B - Motor safety circuit and mixer - Google Patents
Motor safety circuit and mixer Download PDFInfo
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- CN110063670B CN110063670B CN201910343923.XA CN201910343923A CN110063670B CN 110063670 B CN110063670 B CN 110063670B CN 201910343923 A CN201910343923 A CN 201910343923A CN 110063670 B CN110063670 B CN 110063670B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
- A47J43/07—Parts or details, e.g. mixing tools, whipping tools
- A47J43/08—Driving mechanisms
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Control Of Electric Motors In General (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The embodiment of the invention relates to the technical field of control circuits, and particularly discloses a motor safety circuit and a stirrer, wherein the motor safety circuit comprises a first resistance-capacitance voltage reduction circuit, a motor control circuit, a blocking circuit and a second resistance-capacitance voltage reduction circuit which are connected with each other; the first resistance-capacitance voltage reduction circuit comprises a first voltage stabilizing diode, the second resistance-capacitance voltage reduction circuit comprises a second voltage stabilizing diode, the motor control circuit comprises a switch circuit, a controller and a charging circuit, and the controller is respectively connected with the blocking circuit, the switch circuit and the charging circuit; the charging circuit is connected with the switch circuit, and the second resistance-capacitance voltage reduction circuit is connected with the charging circuit; when the switching circuit is in a disconnected state, the motor is in a non-working state, the first voltage stabilizing diode is connected with the charging circuit in parallel, and the controller controls the on-off of the blocking circuit by outputting a square wave signal. By the mode, the power consumption of the household appliance in the standby state can be reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of control circuits, in particular to a motor safety circuit and a stirrer.
Background
Common mixer among the kitchen appliances, its theory of operation is rotatory through the sharp tool bit of alternating current electric motor safety circuit drive to the cutting or kibbling food, therefore the mixer has higher ann rule requirement in small household appliances product.
In the process of implementing the present invention, the inventor of the present invention finds that the electric power consumption in the standby state is large in the existing blender due to the circuit design and the like.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an embodiment of the present invention provides a motor safety circuit and a blender, which can reduce the power consumption of a household appliance in a standby state.
In order to solve the above technical problem, one technical solution adopted by the embodiments of the present invention is: there is provided a motor safety circuit comprising: the first resistance-capacitance voltage reduction circuit, the motor control circuit and the blocking circuit are connected with each other; the motor control circuit also comprises a second resistance-capacitance voltage reduction circuit, and the second resistance-capacitance voltage reduction circuit is connected with the motor control circuit; the motor control circuit is used for controlling the starting and stopping of the motor; the first resistance-capacitance voltage reduction circuit comprises a first voltage stabilizing diode, the motor control circuit comprises a switch circuit, a controller and a charging circuit, and the controller is respectively connected with the blocking circuit, the switch circuit and the charging circuit; the charging circuit is connected with the switch circuit; the first voltage stabilizing diode is connected with the charging circuit; when the switch circuit is in a disconnected state, the motor is in a non-working state, the first voltage stabilizing diode charges the charging circuit, and the controller controls the on-off of the blocking circuit by outputting a square wave signal; when the blocking circuit is connected, the first voltage stabilizing diode is short-circuited; the second resistance-capacitance voltage reduction circuit comprises a second voltage stabilizing diode, and the voltage stabilizing diode is connected with the charging circuit; when the switch circuit is in an on state, the motor is in a working state, the second resistance-capacitance voltage reduction circuit charges the charging circuit, and the charging circuit supplies power to the switch circuit.
Optionally, the motor safety circuit further includes a bidirectional thyristor, the bidirectional thyristor is connected to the controller, and the bidirectional thyristor is connected in series to the motor and is configured to control starting and stopping of the motor.
Optionally, the switch circuit includes a control switch, a relay and a first switch component, and the control switch is connected to one end of the charging circuit; the first end of the relay is connected with one end of a power supply, the second end of the relay is connected with one ends of the motor and the second resistance-capacitance voltage reduction circuit, and the other ends of the motor and the second resistance-capacitance voltage reduction circuit are connected with the other end of the power supply, wherein the first end and the second end of the relay are two ends of a switch of the relay; the third end of the relay is connected with the control switch, the fourth end of the relay is connected with the first end of the first switch assembly, the control end of the first switch assembly is connected with the controller, the second end of the first switch assembly is connected with the charging circuit, and the third end and the fourth end of the relay are two ends of a coil of the relay; when the control switch is turned on, the third end of the relay is connected with a charging circuit, and the charging circuit supplies power to the coil of the relay.
Optionally, the charging circuit includes a first charging capacitor, the first charging capacitor is connected in parallel with the second resistance-capacitance voltage-reducing circuit, and when the control switch is turned off, the first charging capacitor is connected in parallel with the first voltage-stabilizing diode; when the control switch is turned on, the first charging capacitor is connected with the coil of the relay in parallel.
Optionally, the charging circuit further includes a second charging capacitor, the first resistance-capacitance voltage reducing circuit further includes a third zener diode, the third zener diode is connected in series with the first zener diode, the third zener diode is connected in parallel with the second charging capacitor, and two ends of the second charging capacitor are further connected to the two power interfaces of the controller respectively.
Optionally, the blocking circuit includes a second switch component, and the controller includes a third output terminal; the control end of the second switch component is connected with the third output end; the second switch component is connected with the first voltage stabilizing diode in parallel; when the control switch is turned off, the third output end outputs square waves with alternate high and low levels.
Optionally, the blocking circuit further includes a third switching component; the third output end is connected with the control end of the third switch component; the first end of the third switch component is connected with the control end of the second switch component, and the second end of the third switch component is grounded.
Optionally, the first resistance-capacitance voltage-reducing circuit further includes a first voltage-reducing resistor, a first voltage-reducing capacitor, a first forward diode, and a first backward diode; one end of the first step-down capacitor is connected with the first step-down resistor, and the other end of the first step-down capacitor is respectively connected with one end of the first forward diode and one end of the first backward diode; the other end of the first backward diode is connected with one end of the first voltage stabilizing diode; when the control switch is closed, the first voltage stabilizing diode and the charging circuit are connected; the other end of the first voltage reduction resistor is connected with one end of a power supply, and the other ends of the first forward diode and the first voltage stabilizing diode are connected with the other end of the power supply; the second resistance-capacitance voltage reduction circuit further comprises a second voltage reduction resistor, a second voltage reduction capacitor, a second forward diode and a second backward diode; two ends of the second step-down resistor are respectively connected with a second end of the relay and one end of the second step-down capacitor, and the other end of the second step-down capacitor is respectively connected with one ends of the second forward diode and the second backward diode; the other end of the second backward diode is connected with one end of the second voltage stabilizing diode; the second voltage stabilizing diode is connected with the charging circuit in parallel; and the other ends of the second forward diode and the second voltage stabilizing diode are connected to the other end of the power supply.
Optionally, the first resistance-capacitance voltage reduction circuit further includes an auxiliary charging capacitor, and the auxiliary charging capacitor is connected in parallel with the first voltage stabilizing diode.
In order to solve the technical problem, an embodiment of the invention further provides a stirrer, which comprises the motor safety circuit.
The embodiment of the invention has the beneficial effects that: in the embodiment of the present invention, when the switch circuit is turned on, the controller receives the information that the switch circuit is turned on, so that the switch circuit is charged by the charging circuit. In addition, when the switch circuit is charged by the charging circuit, the motor and the second resistance-capacitance voltage reduction circuit are both connected to the power supply, at the moment, the motor is started and is in a working state, and the charging circuit starts to be powered by the second resistance-capacitance voltage reduction circuit. When the switch circuit is closed, the charging circuit is charged by a first voltage stabilizing diode in the first resistance-capacitance voltage reducing circuit. At this time, the controller outputs square waves with alternate high and low levels to the blocking circuit. When the blocking circuit is connected, the first voltage stabilizing diode is in short circuit, so that the first voltage stabilizing diode is not powered, and the standby power consumption is reduced. Further, the embodiment of the invention can control the time interval of the first voltage stabilizing diode for recovering power supply by adjusting the duty ratio of the square wave with high and low level alternated output by the controller, thereby controlling the power consumption.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more comprehensible.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram of a motor safety circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a motor safety circuit according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, the motor safety circuit 100 includes a motor control circuit 200, a first rc step-down circuit 300, a second rc step-down circuit 400, and a blocking circuit 500. The motor control circuit 200, the first resistance-capacitance voltage reduction circuit 300 and the blocking circuit 500 are connected to each other, and the motor control circuit 200 is configured to control starting and stopping of the motor 20. In addition, the first rc circuit 300 includes a first zener diode 305, the second rc circuit 400 includes a second zener diode 405, the motor control circuit 200 includes a switching circuit 210, a controller 230, and a charging circuit 220, the controller 230 is connected to the blocking circuit 500, the switching circuit 210, and the charging circuit 220, the charging circuit 220 is connected to the switching circuit 210, and the second zener diode 405 is connected to the charging circuit 220.
When the switching circuit 210 is in the off state, the switching circuit 210 disconnects the motor 20 and the second rc step-down circuit 400 from the power supply. At this time, the motor 20 is in a non-operating state, and the first zener diode 305 is connected in parallel with the charging circuit 220 for charging the charging circuit 220. Meanwhile, the controller 230 controls the on/off of the blocking circuit 500 by outputting a square wave signal, and in one embodiment, when the blocking circuit 500 receives a low level, the blocking circuit 500 is turned on. When the blocking circuit 500 is turned on, the blocking circuit 500 may control the first zener diode 305 to be short-circuited, so that the first zener diode 305 is not powered, thereby reducing power consumption.
When the switch circuit 210 is in the on state, the motor 20 and the second rc step-down circuit 400 are connected to the power supply 10, and at this time, the motor 20 is in the working state, the second rc step-down circuit 400 charges the charging circuit 220, and the charging circuit 200 supplies power to the switch circuit 210.
In the embodiment of the present invention, when the motor 20 is in a non-operating state, the controller 230 outputs a square wave with alternate high and low levels to the blocking circuit 500, so that the first zener diode 305 is powered intermittently, thereby reducing power consumption. Further, the embodiment of the present invention may also control the time interval of the first zener diode 305 recovering the power supply by adjusting the duty ratio of the square wave with alternate high and low levels output by the controller 230, so as to control how much the power consumption is reduced.
When the switch circuit 210 is in the off state, the charging circuit 200 is connected in parallel with the first zener diode 305, and the first zener diode 305 charges the charging circuit 200. At the same time, the connection of the switching circuit 210 and the charging circuit 200 is disconnected. When the switching circuit 210 is in the off state, the switching circuit 210 disconnects the motor 20 from the power source 10, thereby rendering the motor 20 in the non-operating state.
When the switch circuit 210 is in the on state, the charging circuit 200 is disconnected from the first zener diode 305, the switch circuit 210 is connected to the charging circuit 200, the charging circuit 200 provides power to the switch circuit 210, and when the switch circuit 210 is powered, the switch circuit 210 is connected to the second rc step-down circuit 400, the motor 20 and the power supply 10, so that the motor 20 is in the operating state, and the second zener diode 405 of the second rc step-down circuit 400 can charge the charging circuit 200.
When the switching circuit 210 is turned on and the power supply 10 is cut off, the motor 20 stops operating, the charging circuit 200 loses power supply, and the switching circuit 210 loses power supply, so that the second rc step-down circuit 400 is disconnected from the power supply 10. Thereafter, when the power source 10 is switched on again, the charging circuit 200 is not supplied with power by the first zener diode 305 nor by the second zener diode 405, so that the motor 20 cannot be operated again. The switching circuit 210 needs to be turned back to the off state first, the charging circuit 200 is powered first, and then the switching circuit 210 needs to be turned back to the on state, so that the motor 20 can work again. Through the mode, the embodiment of the invention realizes that the motor 20 cannot continue to work when being reconnected after the power supply is interrupted, thereby avoiding the potential safety hazard of users and realizing the function of a safety protection circuit.
In some embodiments, a triac 600 may also be added to the circuits of the above embodiments. Specifically, referring to fig. 2, a control terminal of the triac 600 is connected to the controller 230, and the triac 600 is connected in series with the motor 20 for controlling the start and stop of the motor 20. When the switching circuit 200 is turned on, the controller 230 receives the information that the switching circuit 200 is turned on, and then outputs information to the triac 600 to close the triac 600, thereby connecting the motor 20 to the power supply 10. Conversely, when the switching circuit 200 is turned off, the controller 230 controls the triac 600 to be turned off, thereby disconnecting the motor 20 from the power source 10. Through the above manner, the control of the start and stop of the motor 20 by the bidirectional thyristor 600 can be realized.
In the present embodiment, the bidirectional thyristor 600 is added in the scheme of the foregoing embodiment, so that a user can adjust the distance between two thyristors in the bidirectional thyristor 600 through the controller 230, thereby changing the current flowing through the motor 20 and achieving the purpose of changing the rotation speed of the motor 20. In addition, the triac 600 also improves the safety of the circuit, and the motor 20 can still be turned off by the triac 600 when the switching circuit 210 fails.
With respect to the controller 230 described above, and with continued reference to fig. 2, the controller 230 includes an input 231, a first output 232, a second output 233, and a third output 234. The input terminal 231 is connected to the charging circuit 220, and determines the on and off states of the switching circuit 210 by detecting the voltage information of the charging circuit 220. The first output 232 is connected to the switching circuit 210. The second output terminal 233 is connected to a control terminal of the triac 600 to control the opening and closing of the triac 600 according to the operating state of the motor control circuit 200. The triac 600 is also used for connecting with the motor 20, controlling the disconnection and connection between the motor 20 and the power supply 10, and controlling the current passing through the motor 20 to adjust the working state of the motor 20. The third output 234 is connected to the blocking circuit 500, and the third output 234 may output a square wave with alternating high and low levels to control the connection and disconnection of the blocking circuit 500 according to the operating state of the motor control circuit 200.
With respect to the above-described switching circuit 210 and charging circuit 220, and with continued reference to fig. 2, the switching circuit 210 includes a control switch 211, a relay 212, and a first switching element 213. The charging circuit 220 includes a first charging capacitor 221, a third voltage-dropping resistor 222, and a second charging capacitor 223,. The control switch 211 may be a single-pole double-throw switch, and a fixed end of the control switch is connected to one end of the first charging capacitor 221. The active terminal of the control switch 211 may be a closed terminal (e.g., terminal a in fig. 2) and an open terminal (e.g., terminal B in fig. 2), respectively, to indicate the turning-off and turning-on of the control switch 211, and the turning-off and turning-on of the control switch 211 indicate the turning-off and turning-on of the switch circuit 210. The turn-off terminal is connected to the first zener diode 305 in the first rc buck circuit 300, the turn-on terminal is connected to the third terminal of the relay 212, the fourth terminal of the relay 212 is connected to the first terminal of the first switch module 213, the control terminal of the first switch module 213 is connected to the controller 230, the second terminal of the first switch module 213 is connected to the charging circuit 220, wherein the third terminal and the fourth terminal of the relay 212 are two terminals of the coil of the relay 212. The first end of the relay 212 is connected to one end of the power supply 10, the second end of the relay 212 is connected to one ends of the motor 20 and the second rc step-down circuit 400, and the other ends of the motor 20 and the second rc step-down circuit 400 are connected to the other end of the power supply 10, wherein the first end and the second end of the relay 212 are two ends of a switch of the relay 212.
The other end of the first charging capacitor 221 is connected to one end of the second charging capacitor 223, and the second charging capacitor 223 and the first charging capacitor 221 which are connected in series are further connected in parallel to the second rc step-down circuit 400 and the coils of the first switch component 213 and the relay 212 which are connected in series, and are used for supplying power to the coil of the relay 500. The other end of the second charging capacitor 223 is connected to the input end 231 of the controller 230, and both ends of the second charging capacitor 223 are further respectively connected to two power interfaces of the controller 230, so as to supply power to the controller 230. The third voltage-relief resistor 222 is connected in parallel with the first charging capacitor 221, and is configured to enable the first charging capacitor 221 to discharge quickly when the power is off, so as to prevent residual electric quantity in the first charging capacitor 221 when the power is turned on immediately after the power is off.
When the control switch 211 is turned off, that is, the active end of the control switch 211 is located at the B end, the first charging capacitor 221 and the second charging capacitor 223 connected in series are connected in parallel to the first rc step-down circuit 300, and are charged by the first rc step-down circuit 300, so as to store the electric quantity. At this time, the controller 230 is supplied with power from the second charging capacitor 223, and starts operating. The controller 230 acquires a signal for controlling the switch 211 to be turned off through the voltage received by the input end 231 of the controller 230, and then the controller 230 controls the first switch assembly 213 to be turned off through the control end of the first switch assembly 213, so that the first charging capacitor 221 and the second charging capacitor 223 cannot supply power to the coil of the relay 212, and the controller 230 controls the switch circuit 210 and the charging circuit 200 to be turned off. Therefore, the switch of the relay 212 is turned off, and the connection between the motor 20 and the power source 10 is disconnected, so that the power cannot be supplied, and the operation is stopped.
When it is desired to start the motor 20, the movable end of the control switch 211 may be adjusted to the on end. At this time, the voltage received by the input end 231 of the controller 230 changes, the controller 230 obtains a signal for controlling the switch 211 to be turned on, and then the controller 230 controls the first switch assembly 213 to be turned on, so that the coil of the relay 212, the first charging capacitor 221 and the second charging capacitor 223 form a loop, and the controller 230 controls the switch circuit 210 and the charging circuit 200 to be communicated. And the amount of power stored by the first and second charging capacitors 221 and 223 when the control switch 211 is turned off may supply power to the coil of the relay 212 to turn on the switch of the relay 212. Thereafter, the motor 20 may be switched on to the power source 10 to start operation. Meanwhile, the second rc step-down circuit 400 is also connected to the power supply 10, and the second rc step-down circuit 400 starts to supply power to the first charging capacitor 221 and the second charging capacitor 223, so as to ensure that the switch of the relay 212 is continuously turned on. By the above manner, when the control switch 211 is turned off, the motor 20 stops operating, and when the control switch 211 is turned on, the motor 20 continues operating.
When the control switch 211 is turned on and the power supply 10 is cut off, the motor 20 stops operating and the first and second charging capacitors 221 and 223 lose power supply. When the first and second charging capacitors 221 and 223 consume power, the switch of the relay 212 is turned off. When the power supply 10 is reconnected, the first charging capacitor 221 and the second charging capacitor 223 are depleted of power, which turns off the switch of the relay 212, so that the second rc step-down circuit 400 cannot be connected to the power supply 10, and therefore cannot charge the first charging capacitor 221 and the second charging capacitor 223. Therefore, the first charging capacitor 221 and the second charging capacitor 223 cannot supply power to the coil of the relay 212, so that the switch of the relay 212 is continuously in the off state, and the motor 20 cannot be connected to the power supply 10. The motor 20 can be operated again only by first adjusting the active terminal of the control switch 211 to the off terminal, first charging the first charging capacitor 221 and the second charging capacitor 223, and then adjusting the active terminal of the control switch 211 to the on terminal. In this way, the motor 20 does not continue to operate when the power is turned on after the power is off, thereby avoiding potential safety hazards caused by the power.
It can be understood that: the control switch 211 is not limited to the above description, and may be other devices having the same control effect, and will not be described herein again. In addition, in other embodiments, the third voltage-relief resistor 222 and/or the second charging capacitor 223 in the charging circuit 220 may be omitted, the coil of the relay 212 is powered by only the first charging capacitor 221, and the controller 230 may be powered by a separate power source. The switching circuit 210 and the charging circuit 220 are not limited to the above description, and may be other circuits having the same switching or charging effect, and are not described herein again.
For the first switch component 213, the first switch component 213 may be a transistor. The base of the transistor is the control terminal of the first switch component 213. When the first output terminal 232 of the controller 230 outputs a high level or a low level to the base of the transistor, a short circuit or an open circuit between the collector and the emitter of the transistor may be controlled, thereby implementing the switching of the first switching element 213. Of course, in other embodiments, the first switch component 213 can also be other devices with the same switching effect, and the description thereof is omitted.
With reference to the first rc step-down circuit 300, with continued reference to fig. 2, the first rc step-down circuit 300 further includes a first step-down resistor 301, a first step-down capacitor 302, a first forward diode 303, a first backward diode 304, a third zener diode 306, a first voltage-relief resistor 307, an auxiliary charging capacitor 308, and an anti-discharging diode 309. Two ends of the first voltage-reducing resistor 301 are respectively connected to the other end of the power supply 10 and one end of the first voltage-reducing capacitor 302. The other end of the first voltage-reducing capacitor 302 is connected to one end of a first forward diode 303 and one end of a first backward diode 304, respectively. The other end of the first backward diode 304 is connected to one end of a first zener diode 305, the other end of the first zener diode 305 is connected to one end of a third zener diode 306, and the first zener diode 305 is further connected in parallel to the blocking circuit 500. The blocking circuit 500 may intermittently short-circuit the first zener diode 305 with a square wave with alternating high and low levels output by the third output 234 of the controller 230, so as to achieve the purpose of reducing the standby power consumption. The other ends of the third zener diode 306 and the first forward diode 303 are connected to one end of the power supply 10, so that the first rc step-down circuit 300 is connected to the power supply 10. In addition, when the control switch 211 is turned off, the first zener diode 305 and the third zener diode 306 are connected in parallel to the first charging capacitor 221 and the second charging capacitor 223, respectively, to charge them.
The power supply 10 outputs an ac power, and the ac power is stepped down by the first step-down resistor 301 and the first step-down capacitor 302. The forward current in the ac power is then blocked by the first backward diode 304, and the fluctuating dc power flows through the first zener diode 305 and the third zener diode 306, and the fluctuating dc power is converted into a stable dc power by the first zener diode 305 and the third zener diode 306, so as to stably charge the first charging capacitor 221 and the second charging capacitor 223. In addition, the blocked forward current may also flow back to the power supply 10 through the first forward diode 303, so that the first step-down capacitor 302 can be smoothly charged and discharged.
Through the manner, the embodiment of the invention can perform voltage reduction and stabilization on the alternating current output by the power supply 10, and finally form stable low-voltage direct current to supply power to the first charging capacitor 221 and the second charging capacitor 223, so that the first charging capacitor 221 and the second charging capacitor 223 can be prevented from being burnt out by high voltage, and a protection effect is achieved on the first charging capacitor 221 and the second charging capacitor 223.
For the first voltage-dropping resistor 307, the first voltage-dropping resistor 307 is connected in parallel with the first voltage-dropping capacitor 302, so that the first voltage-dropping capacitor 302 can quickly exhaust the electric quantity when the power supply 10 is turned off.
As for the auxiliary charging capacitor 308 described above, the auxiliary charging capacitor 308 is also connected in parallel with the first zener diode 305, so that it can be charged through the first zener diode 305. When the first charging capacitor 221 is connected in parallel with the first zener diode 305, the fully charged auxiliary charging capacitor 308 can charge the first charging capacitor 221 at the same time, so as to achieve the effect of fast charging.
As for the above-described discharge prevention diode 309, the discharge prevention diode 309 is connected in series between the auxiliary charging capacitor 308 and the first zener diode 305. It is possible to prevent the power of the auxiliary charging capacitor 308 from being consumed when the first zener diode 305 is shorted by the blocking circuit 500, so that the first charging capacitor 221 cannot be charged.
It can be understood that: in other embodiments, the first voltage-dropping resistor 307 and/or the auxiliary charging capacitor 308 and/or the discharge-preventing diode 309 may be omitted, the first charging capacitor 221 may be charged only by the first zener diode 305, and the third zener diode 306 may be omitted for a controller circuit without the second charging capacitor 223. In addition, the first rc step-down circuit 300 is not limited to the above description, and may be other circuits with the same step-down and voltage-stabilizing effects, which are not described herein again.
With reference to the second rc step-down circuit 400, with continued reference to fig. 2, the second rc step-down circuit 400 further includes a second step-down resistor 401, a second step-down capacitor 402, a second forward diode 403, a second backward diode 404, a second voltage-dropping resistor 406, a first protection resistor 407, and a third backward diode 408. Two ends of the second voltage-reducing resistor 401 are respectively connected with one end of a switch of the relay 212 and one end of a second voltage-reducing capacitor 402, the other end of the switch of the relay 212 is used for connecting the other end of the power supply 10, and the other end of the second voltage-reducing capacitor 402 is respectively connected with one ends of a second forward diode 403 and a second backward diode 404. The other end of the second backward diode 404 is connected to one end of a second zener diode 405, and the second zener diode 405 is connected in parallel to the first charging capacitor 221 and the second charging capacitor 223 which are connected in series. The other end of the switch of the relay 212 is used for connecting the other end of the power supply 10, and the other ends of the second forward diode 403 and the second zener diode 405 are used for connecting one end of the power supply 10.
When the switch of the relay 212 is closed, the power supply 10 communicates with the second rc step-down circuit 400. The ac power output by the power supply 10 is firstly stepped down by the second step-down resistor 401 and the second step-down capacitor 402, and then the forward current in the ac power is blocked by the second backward diode 404, so as to form a fluctuating dc power, and then the fluctuating dc power is stabilized by the second voltage stabilizing diode 405 to form a stable dc power, so as to stably charge the first charging capacitor 221 and the second charging capacitor 223. In addition, the blocked forward current may also flow back to the power supply 10 through the second forward diode 403, so that the second buck capacitor 402 can be smoothly charged and discharged.
Like the first rc step-down circuit 300, the second step-down resistor 401 may also convert the ac power output by the power supply 10 into a low-voltage stable dc power, so as to protect the first charging capacitor 221 and the second charging capacitor 223.
It can be understood that: in other embodiments, the motor control circuit 200 may not include the second charging capacitor 223, and the second zener diode 405 may be connected in parallel with only the first charging capacitor 221.
For the second voltage-dropping resistor 406, the second voltage-dropping resistor 406 is connected in parallel with the second voltage-dropping capacitor 402, so that the second voltage-dropping capacitor 402 can quickly exhaust the electric quantity when the power supply 10 is turned off.
As for the first protection resistor 407, the first protection resistor 407 is also connected in parallel with the second zener diode 405, and is used for reducing the current of the second zener diode 405 to protect the same.
As for the third backward diode 408, two ends of the third backward diode 408 are respectively connected to one end of the first charging capacitor 221 and one end of the second zener diode 405, so as to prevent the electric quantity of the first charging capacitor 221 from flowing back to the second rc step-down circuit 400.
It can be understood that: in other embodiments, the second voltage-discharging resistor 406 and/or the first protection resistor 407 and/or the third backward diode 408 may also be omitted, and are not described herein again. The second rc step-down circuit 400 is not limited to the above description, and may be other circuits with the same step-down and voltage-stabilizing effects, which are not described herein again.
With reference to the blocking circuit 500, with continued reference to fig. 2, the blocking circuit 500 includes a second switch element 501, a third switch element 502, a first voltage limiting resistor 503, a second voltage limiting resistor 504, and a second protection resistor 505. The third switching component 502 is connected to the third output terminal 234 of the controller 230, a first terminal of the third switching component 502 is connected to the control terminal of the second switching component 501, and a second terminal of the third switching component 502 is connected to one terminal of the power supply 10 and the ground. The second switching component 501 is connected in parallel with the first zener diode 305.
The third switch component 502 and the second switch component 501 may be a PNP transistor and an NPN transistor, respectively. When the input 231 of the controller 230 detects that the control switch 211 is turned off, the third output 234 outputs a square wave with alternate high and low levels. When the third output terminal 234 outputs a low level to the base of the third switching element 502, the collector and the emitter of the third switching element 502 are short-circuited, so that the base of the second switching element 501 receives a high level, and the collector and the emitter of the second switching element 501 are short-circuited, so that the first zener diode 305 is short-circuited and is not powered, thereby reducing power consumption. When the output of the third output terminal 234 is high, the collector and the emitter of the third switching element 502 are disconnected, so that the base of the second switching element 501 does not receive high, and the collector and the emitter of the second switching element 501 are disconnected. Further, the first zener diode 305 recovers power supply to ensure that the power of the first charging capacitor 221 is not consumed, and the power supply requirement of the subsequent electrical appliance 212 after the control switch 211 is turned on is met. At present, all small household appliances exported to Europe must meet the EuP certification, the EuP certification is an ecological design instruction of energy-consuming products in European Union, most household products exported to Europe need to meet the standby power consumption requirement of 0.5W, and the standby power consumption under the future Eup instruction is lower, even less than 0.3W. The invention can control the time interval of the first zener diode 305 for recovering power supply by adjusting the duty ratio of the third output end 234, thereby reducing the power consumption of the first zener diode 305 to below 0.3W.
It should be noted that: the controller 230 can control the first output 232 and the second output 233 of the controller 230 and the third output 234 of the controller can output high level or low level according to the prior art by receiving the voltage information of the input 231, and the controller 230 can be a single chip or a processor according to the prior art, for example: intel core i 7 processors, AMD Ruilon 3 processors, and so on.
It can be understood that: in other embodiments, the third switch assembly 502 and the second switch assembly 501 are not limited to the above description, and may also be other switch elements having the same switch function, which is not described herein again. The third switching component 502 may be omitted, and the control terminal of the second switching component 501 may be directly connected to the third output terminal 234 of the controller 230.
For the first voltage limiting resistor 503 and the second voltage limiting resistor 504, two ends of the first voltage limiting resistor 503 are respectively connected to the third output terminal 234 and the control terminal of the third switching component 502. Two ends of the second voltage limiting resistor 504 are respectively connected with the first end of the third switching component 502 and the control end of the second switching component 501. The first voltage limiting resistor 503 and the second voltage limiting resistor 504 are used for reducing the voltage received by the control terminals of the third switching component 502 and the second switching component 501, respectively, so as to protect them.
As for the second protection resistor 505, two ends of the second protection resistor 505 are respectively connected to the other end of the first zener diode 305 and the second end of the second switch component 501. The second protection resistor 505 is used to play a role in buffering when the second switch component 501 short-circuits the first zener diode 305, so as to prevent the second switch component 501 from being burned out.
It can be understood that: in other embodiments, the first voltage limiting resistor 503 and/or the second voltage limiting resistor and/or the second protection resistor 505 may also be omitted, and are not described herein again.
In the embodiment of the present invention, when the control switch 211 is turned off, the first charging capacitor 221 is charged by the first rc step-down circuit 300. When the control switch 211 is turned on, the input 231 of the controller 230 detects a voltage change, and the first output 232 outputs a control signal to close the first switch component 213, so that the coil of the relay 212 and the first charging capacitor 221 form a loop, so that the coil of the relay 212 is powered by the first charging capacitor 221, and at this time, the first charging capacitor 221 is no longer charged by the first rc voltage-reducing circuit 300. And the switch of the relay 212 is connected in series with the motor 20, and when the coil of the relay 212 is supplied with power, the switch of the relay 212 is closed to operate the motor 20. Meanwhile, when the switch of the relay 212 is closed, the first charging capacitor 221 is charged by the second rc step-down circuit 400, so as to ensure that the coil of the relay 212 is continuously powered. In addition, when the motor 20 is powered on after power off during operation, the electric quantity of the first charging capacitor 221 is consumed during power off, so that the coil of the relay 212 is not powered on, the switch of the relay 212 is switched off, the first charging capacitor 221 cannot be charged by the second resistance-capacitance voltage reduction circuit 400, the motor 20 cannot run again, and the safety problem caused by continuous running of the motor 20 when the power on occurs after power off is avoided. In addition, during the standby process, that is, when the control switch 211 is turned off, the blocking circuit 500 can reduce the power consumption of the first rc step-down circuit 300, and does not affect the charging of the first rc step-down circuit 300 to the first charging capacitor 221, so that the circuit is more economical and practical and has competitiveness.
The invention also provides a blender comprising a motor safety circuit 100. The structure and function of the motor safety circuit 100 are the same as those of the motor safety circuit 100 in the above embodiment, and for the structure and function of the motor safety circuit 100, reference may be made to the above embodiment, and details are not repeated here.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A motor safety circuit, comprising:
the first resistance-capacitance voltage reduction circuit, the motor control circuit and the blocking circuit are connected with each other; the motor control circuit also comprises a second resistance-capacitance voltage reduction circuit and a bidirectional thyristor, wherein the second resistance-capacitance voltage reduction circuit is connected with the motor control circuit; the motor control circuit is used for controlling the starting and stopping of the motor;
the first resistance-capacitance voltage reduction circuit comprises a first voltage stabilizing diode, the motor control circuit comprises a switch circuit, a controller and a charging circuit, and the controller is respectively connected with the blocking circuit, the switch circuit and the charging circuit; the charging circuit is connected with the switch circuit; the first voltage stabilizing diode is connected with the charging circuit;
the bidirectional thyristor is connected with the controller, and is connected with the motor in series and used for controlling the starting and stopping of the motor;
when the switch circuit is in a disconnected state, the motor is in a non-working state, the first voltage stabilizing diode charges the charging circuit, and the controller controls the on-off of the blocking circuit by outputting a square wave signal; when the blocking circuit is connected, the first voltage stabilizing diode is short-circuited;
the second resistance-capacitance voltage reduction circuit comprises a second voltage stabilizing diode, and the voltage stabilizing diode is connected with the charging circuit; when the switch circuit is in an on state, the motor is in a working state, the second resistance-capacitance voltage reduction circuit charges the charging circuit, and the charging circuit supplies power to the switch circuit.
2. The motor safety circuit of claim 1,
the switching circuit comprises a control switch, a relay and a first switching component, and the control switch is connected with one end of the charging circuit;
the first end of the relay is connected with one end of a power supply, the second end of the relay is connected with one ends of the motor and the second resistance-capacitance voltage reduction circuit, and the other ends of the motor and the second resistance-capacitance voltage reduction circuit are connected with the other end of the power supply, wherein the first end and the second end of the relay are two ends of a switch of the relay;
the third end of the relay is connected with the control switch, the fourth end of the relay is connected with the first end of the first switch assembly, the control end of the first switch assembly is connected with the controller, the second end of the first switch assembly is connected with the charging circuit, and the third end and the fourth end of the relay are two ends of a coil of the relay;
when the control switch is turned on, the third end of the relay is connected with a charging circuit, and the charging circuit supplies power to the coil of the relay.
3. The motor safety circuit of claim 2,
the charging circuit comprises a first charging capacitor, the first charging capacitor is connected with the second resistance-capacitance voltage reduction circuit in parallel, and when the control switch is closed, the first charging capacitor is connected with a first voltage stabilizing diode in parallel; when the control switch is turned on, the first charging capacitor is connected with the coil of the relay in parallel.
4. The motor safety circuit according to claim 3, wherein the charging circuit further comprises a second charging capacitor, the first resistor-capacitor voltage-reducing circuit further comprises a third zener diode, the third zener diode is connected in series with the first zener diode, the third zener diode is connected in parallel with the second charging capacitor, and two ends of the second charging capacitor are further connected to two power interfaces of the controller respectively.
5. The motor safety circuit of claim 1, wherein the blocking circuit includes a second switching component, and the controller includes a third output;
the control end of the second switch component is connected with the third output end; the second switch component is connected with the first voltage stabilizing diode in parallel; when the control switch is turned off, the third output end outputs square waves with alternate high and low levels.
6. The motor safety circuit of claim 5, wherein the blocking circuit further comprises a third switch component; the third output end is connected with the control end of the third switch component; the first end of the third switch component is connected with the control end of the second switch component, and the second end of the third switch component is grounded.
7. The motor safety circuit of claim 2,
the first resistance-capacitance voltage reduction circuit further comprises a first voltage reduction resistor, a first voltage reduction capacitor, a first forward diode and a first backward diode;
one end of the first step-down capacitor is connected with the first step-down resistor, and the other end of the first step-down capacitor is respectively connected with one end of the first forward diode and one end of the first backward diode;
the other end of the first backward diode is connected with one end of the first voltage stabilizing diode;
when the control switch is closed, the first voltage stabilizing diode and the charging circuit are connected;
the other end of the first voltage reduction resistor is connected with one end of a power supply, and the other ends of the first forward diode and the first voltage stabilizing diode are connected with the other end of the power supply;
the second resistance-capacitance voltage reduction circuit further comprises a second voltage reduction resistor, a second voltage reduction capacitor, a second forward diode and a second backward diode;
two ends of the second step-down resistor are respectively connected with a second end of the relay and one end of the second step-down capacitor, and the other end of the second step-down capacitor is respectively connected with one ends of the second forward diode and the second backward diode;
the other end of the second backward diode is connected with one end of the second voltage stabilizing diode;
the second voltage stabilizing diode is connected with the charging circuit in parallel;
and the other ends of the second forward diode and the second voltage stabilizing diode are connected to the other end of the power supply.
8. The motor safety circuit of claim 7, wherein the first rc step-down circuit further comprises an auxiliary charging capacitor connected in parallel with the first zener diode.
9. A blender, comprising a motor safety circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910343923.XA CN110063670B (en) | 2019-04-26 | 2019-04-26 | Motor safety circuit and mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910343923.XA CN110063670B (en) | 2019-04-26 | 2019-04-26 | Motor safety circuit and mixer |
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| Publication Number | Publication Date |
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| CN110063670A CN110063670A (en) | 2019-07-30 |
| CN110063670B true CN110063670B (en) | 2020-10-23 |
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| CN201910343923.XA Active CN110063670B (en) | 2019-04-26 | 2019-04-26 | Motor safety circuit and mixer |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11109919A (en) * | 1997-09-30 | 1999-04-23 | Toyota Motor Corp | Method and circuit pwm driving |
| CN201061131Y (en) * | 2007-06-22 | 2008-05-14 | 深圳市和而泰电子科技有限公司 | Protective circuit for stirrer |
| CN202750017U (en) * | 2012-07-20 | 2013-02-20 | 深圳市振邦实业有限公司 | Power supply circuit |
| CN203180796U (en) * | 2013-04-03 | 2013-09-04 | 深圳拓邦股份有限公司 | Coffee pot and coffee pot control circuit |
| CN206293365U (en) * | 2016-12-30 | 2017-06-30 | 陆正平 | A kind of energy-saving resistance-capacitance depressurization relay drive circuit |
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