CN209571815U - A kind of protection circuit and blender - Google Patents
A kind of protection circuit and blender Download PDFInfo
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- CN209571815U CN209571815U CN201920058898.6U CN201920058898U CN209571815U CN 209571815 U CN209571815 U CN 209571815U CN 201920058898 U CN201920058898 U CN 201920058898U CN 209571815 U CN209571815 U CN 209571815U
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Abstract
The protection circuit and blender of a kind of circuit protection field are provided in the utility model embodiment；By connected on the output end of over-current detection circuit holding circuit hardware controls cut off the power circuit conducting releasing contact to cutting off main circuit current; realization can cut off in time motor in motor rotation blockage and maintain the off state of motor; this protection circuit structure is simple; it is easily assembled; motor is cut off when over current of motor can be reached under lower price and less device (lower cost) and maintains the function of off state, improves the competitiveness of Related product.
Description
Technical field
The utility model relates to circuit protection field, in particular to a kind of protection circuit and blender.
Background technique
With the raising of people's lives level, blender is more and more appeared in family kitchen, and blender makes
With can be potentially encountered in the process it is larger be not easy the food smashed when, the problem of blocking stirring structure part, and then lead to motor rotation blockage,
As cut off the power not in time, the motor of blender is gently then burnt, it is heavy then cause the accidents such as fire, so being when blender stall
No can cut off the power in time is particularly important, and is provided with rotation-clogging protection in the blender of part on the market at present and maintains electricity
Road.
Existing blender rotation-clogging protection scheme is mainly by detecting voltage with over-current detection circuit, then by stall signal
It is transferred to MCU, MCU issues the order cut off the power again, and power cutting circuit executes the instruction cut off the power again, and overcurrent is examined at this time
The signal of slowdown monitoring circuit can restore normal signal, but the state that MCU can maintain motor to stop always according to previous setting, reach
Protect the purpose of motor.
During realizing the utility model, inventor's discovery is above, and at least there are the following problems in the related technology: existing
Circuit protection scheme be usually to use MCU as control device, control the shutdown of motor power, the holding circuit of this kind of scheme
Structure is complicated, it is also necessary to which the support of software is developed relatively high with material cost, it will usually the cost for improving blender, for
The user of product price sensitivity, this kind of blender is without too big competitiveness.
Utility model content
In view of the above drawbacks of the prior art, the purpose of the utility model is to provide one kind, and blender can be allowed in motor mistake
Main circuit current is cut off when stream and maintains the protection circuit of dissengaged positions.
The purpose of this utility model is achieved by the following technical solution:
In order to solve the above technical problems, wrapping in a first aspect, provide a kind of protection circuit in the utility model embodiment
It includes: circuit of cutting off the power, over-current detection circuit, holding circuit and the main circuit for being provided with motor；
The output end of the circuit of cutting off the power is connected to the anode of the motor, the control terminal of the circuit of cutting off the power
It is connected to the input terminal of the holding circuit, the input terminal of the over-current detection circuit is connected to the cathode of the motor, described
The output end of over-current detection circuit is connected to the control terminal of holding circuit；
After the over-current detection circuit detects that the current of electric reaches threshold value, the holding circuit conducting is controlled, and
It cuts off the power described in control the electric current of main circuit described in circuitry cuts, the motor is made to stop working.
Optionally, the main circuit further include: power supply, the power supply are motor power supply by the main circuit；
The input terminal of the circuit of cutting off the power is connected to the anode of the power supply, the output end of the over-current detection circuit
The cathode of the power supply is connected to the output end of the holding circuit.
Optionally, the main circuit further include: current sampling resistor and insurance resistance；
The current sampling resistor is connected between the cathode of the motor and the cathode of the power supply, the insurance resistance
It is connected between the anode of positive and described motor of the power supply.
Optionally, further includes: be connected in parallel on the rectification circuit of the positive pole and the power cathode both ends.
Optionally, the rectification circuit includes: dead resistance, first diode and commutation capacitor；
Described dead resistance one end is connected to the anode of the power supply, and the other end is connected to the sun of the first diode
Pole, the cathode of the first diode are connected to the anode of the commutation capacitor, and the cathode of the commutation capacitor is connected to described
The cathode of power supply.
Optionally, the circuit of cutting off the power includes: relay and the second diode, and second diodes in parallel is in institute
The control terminal of relay is stated, the relay is connected between the anode of positive and described motor of the power supply.
Optionally, the over-current detection circuit includes: the current sampling resistor, third diode, adjustable resistance, partial pressure
Resistance and the second capacitor；
The anode of the third diode is connected to the input terminal of the current sampling resistor, the yin of the third diode
Pole is connected to the input terminal of the adjustable resistance, and the output end of the adjustable resistance is connected to the input terminal of the divider resistance,
The output end of the divider resistance is connected to the output end of the current sampling resistor, and second capacitor is connected in parallel on the partial pressure
The both ends of resistance.
Optionally, the input terminal of the output end of the adjustable resistance and the divider resistance is additionally coupled to the holding circuit
Control terminal, the trigger voltage of the holding circuit conducting is controlled by controlling the resistance value size of the adjustable resistance.
Optionally, the holding circuit includes: thyristor, and the gate pole of the thyristor is connected to the over-current detection circuit
Output end, the anode of the thyristor is connected to the control terminal of the circuit of cutting off the power, the cathode connection of the thyristor
To the cathode of the power supply.
In order to solve the above technical problems, second aspect, a kind of blender is provided in the utility model embodiment, comprising:
Protection circuit described in above-mentioned first aspect.
Compared with prior art, the utility model has the beneficial effects that being in contrast to the prior art, the utility model
A kind of protection circuit and blender are provided in embodiment；It is hard by connecting holding circuit on the output end of over-current detection circuit
Part controls the conducting releasing contact for circuit of cutting off the power to cut off main circuit current, and realization can be cut in time in motor rotation blockage
Power machine and the off state for maintaining motor, this protection circuit structure is simple, is easily assembled, can be in lower price and less
Device (lower cost) under cutting motor and maintain the function of off state when reaching over current of motor, improve Related product
Competitiveness.
Detailed description of the invention
It is illustrated in one or more embodiments by the picture in corresponding attached drawing, these are exemplary
Illustrate not constitute the restriction to embodiment, the element/module and step in attached drawing with same reference numbers label are expressed as
Similar element/module and step, unless there are special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of functional block diagram of the protection circuit provided in the embodiment of the present application one；
Fig. 2 is a kind of structural schematic diagram of the protection circuit provided in the embodiment of the present application one；
Fig. 3 is a kind of structural schematic diagram of the blender provided in the embodiment of the present application two.
Specific embodiment
The utility model is described in detail combined with specific embodiments below.Following embodiment will be helpful to this field
Technical staff further understands the utility model, but does not limit the utility model in any form.It should be pointed out that ability
For the those of ordinary skill in domain, without departing from the concept of the premise utility, various modifications and improvements can be made.
These are all within the protection scope of the present invention.
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, not
For limiting the application.
Specifically, with reference to the accompanying drawing, the embodiment of the present application is further elaborated.
Embodiment one
Referring to Figure 1 and Fig. 2, a kind of protection circuit 1 is provided in the embodiments of the present invention, comprising: cut off the power
Circuit 20, over-current detection circuit 30, holding circuit 40, rectification circuit 50 and the main circuit 10 for being provided with motor M.
The output end for cutting off the power circuit 20 is connected to the anode of the motor M, the circuit 20 of cutting off the power
Control terminal is connected to the input terminal of the holding circuit 40, and the input terminal of the over-current detection circuit 30 is connected to the motor M
Cathode, the output end of the over-current detection circuit 30 is connected to the control terminal of holding circuit 40.The over-current detection circuit 30
It after detecting that the motor M electric current reaches threshold value, controls the holding circuit 40 and is connected, and circuit 20 of cutting off the power described in control
The electric current for cutting off the main circuit 10 makes the motor M stop working.
Above-mentioned main circuit 10 further include: power supply (does not indicate), and the power supply (not indicating) is institute by the main circuit 10
State motor M power supply.The input terminal for cutting off the power circuit 20 is connected to the positive L of the power supply, the over-current detection circuit
The output end of 30 output end and the holding circuit 40 is connected to the cathode N of the power supply.
The main circuit 10 further include: current sampling resistor R2 and insurance resistance FUSE.The current sampling resistor R2 string
It is associated between the cathode of the motor M and the cathode N of the power supply, the insurance resistance FUSE is connected on the anode of the power supply
Between L and the anode of the motor M.When protection circuit 1 is in non-working condition when the insurance resistance FUSE is used for overcurrent, prevent
Each element in circuit 1 is only protected because high current/peak current is burned.
Above-mentioned circuit 20 of cutting off the power includes: relay K1 and the second diode D2, and the second diode D2 is connected in parallel on
The control terminal of the relay K1.The anode of the positive L for being connected on the power supply and the motor M of the relay K1
Between, the relay K1 is normally closed relay, i.e. moving fault relay, and in the relay K1 no power, two contacts are closures
, latter two contact that is powered just disconnects.This kind of relay as electronic switch for example compared to other electronic switches: high current three
The benefit of pole pipe, Mos pipe, IGBT etc. are to have access to AC power source, and not needing rectification can access, and be able to bear larger
Electric current uses relay more simple and reliable as electronic switch in household electrical appliance.
In normal operation, the contact of the relay K1, which is closed always, enables 10 power supply of main circuit to be continuously
Motor M power supply, opening for the contact relay K1 and opening and turning off for shutdown control motor M power supply, in addition, high-current relay
It can be biggish alternating current generator load supplying.The second diode D2 is used to give relay K1 in relay K1 shutdown moment
One bleed-off circuit of coil.
Above-mentioned over-current detection circuit 30 includes: the current sampling resistor R2, third diode D3, adjustable resistance RP1, divides
Piezoresistance R3 and the second capacitor C2.The anode of the third diode D3 is connected to the input terminal of the current sampling resistor R2,
The cathode of the third diode D3 is connected to the input terminal of the adjustable resistance RP1, and the output end of the adjustable resistance RP1 connects
It is connected to the input terminal of the divider resistance R3, the output end of the divider resistance R3 is connected to the defeated of the current sampling resistor R2
Outlet, the second capacitor C2 are connected in parallel on the both ends of the divider resistance R3.
The input terminal of the output end of the adjustable resistance RP1 and the divider resistance R3 are additionally coupled to the holding circuit 40
Control terminal, the adjustable resistance RP1 and the divider resistance R3 divide the triggering electricity to form holding circuit 40 (thyristor TR1)
Pressure, the resistance value size by controlling the adjustable resistance RP1 can control the trigger voltage that the holding circuit 40 is connected.
After the motor M stall, the motor M electric current rises, and the current sampling resistor R2 is due in main circuit 10
It connects with the motor M, the voltage of current sampling resistor R2 can also rise with the rising of motor M electric current, maintain when rising to
After the threshold voltage of circuit 40 (thyristor TR1), triggering holding circuit 40 (thyristor TR1) conducting, 40 (thyristor of holding circuit
TR1) relay K1 is caused to cut off the power, motor M stops working.
Specifically, in the over-current detection circuit 30, electric current forms voltage after passing through the current sampling resistor R2, passes through
The third diode D3 rectification is crossed, voltage passes through second capacitor after the adjustable resistance RP1 and divider resistance R3 are divided
C2 filtering, so that the direct current finally exported smooths out.By adjusting the capacitance of the second capacitor C2, can adjust described
Motor M flows to the time of protection from crossing, and the capacitance of the second capacitor C2 is bigger, when protection circuit 1 opens the response of protection
Between it is longer.
Above-mentioned holding circuit 40 includes: thyristor TR1, and the gate pole of the thyristor TR1 is connected to the over-current detection electricity
The output end on road 30, the anode of the thyristor TR1 are connected to the control terminal of the circuit 20 of cutting off the power, the thyristor
The cathode of TR1 is connected to the cathode N of the power supply.The current supply circuit (not shown) and the main circuit 10 of the thyristor TR1
Circuit is separately designed, and therefore, the thyristor TR1 is after control conducting, the disconnection of circuit 20 of cutting off the power, the main circuit
10 power-off, cause the control signal of the thyristor TR1 gate pole to disconnect, and the thyristor TR1 is still able to maintain that on state,
To which the circuit 20 of cutting off the power also is able to maintain that main circuit 10 disconnects, until user disconnects the confession of the thyristor TR1
Guard mode can be just released after circuit, to achieve the purpose that protect circuit and maintain guard mode.Thyristor TR1 can be controlled
The power supply of the coil of the relay K1 is made to realize the switching of relay K1 state, in the thyristor TR1 in over-current detection
Conducting when circuit 30 detects overcurrent, the coil conducting of the relay K1, two contacts of the relay K1 disconnect, thus
Disconnect the power supply of the motor M.
Above-mentioned rectification circuit 50 is connected in parallel on the positive pole L and the both ends the power cathode N.The rectification circuit 50 wraps
It includes: dead resistance R1, first diode D1 and commutation capacitor C1.The one end the dead resistance R1 is connected to the anode of the power supply
L, the other end are connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the commutation capacitor
The cathode of the anode of C1, the commutation capacitor C1 is connected to the cathode N of the power supply.10 shop of main circuit is to pass through described
One diode D1 rectification, converts alternating current to direct current, is then filtered by the commutation capacitor C1, so that direct current is by wave
It moves smoothened.
In above-mentioned circuit 20 of cutting off the power, over-current detection circuit 30, holding circuit 40, rectification circuit 50 and main circuit 10
The design parameter and model of each element can carry out selection setting according to actual needs, not need to stick to the embodiment of the present application
It limits.
Structure design through this embodiment, the protection circuit 1 of the utility model can be protected in time in over current of motor
Motor maintains guard mode simultaneously.The technical solution of the utility model by access over-current detection circuit 30 to motor M whether just
Often operation is detected, then motor M power supply is cut off in motor M overcurrent by the cutting current circuit 20 and holding circuit 40
Motor is protected and maintains guard mode.The technical solution of the utility model can be applied to need to carry out current of electric
In the household electrical appliance of protection, such as in blender, security risk is reduced.And the protection circuit structure in the technical program is simple,
Be easily assembled, do not need using MCU, to reduce software development cost, and the discrete electric elements in circuit structure it is less and
It is common, it can reduce the cost of the product in production application.
Embodiment two
Fig. 3 is referred to, a kind of blender 2 is provided in the embodiments of the present invention, comprising: described in above-described embodiment one
Protection circuit 1.The blender 2 can pass through protection circuit 1 and cut off current of electric and allow motor in 2 stall of blender
Electric current keeps tripping protection state.In practical applications, the blender 2 can be common blender in family's kitchen tools.
It should be noted that by structure, element, connection type and the above-mentioned implementation of protection circuit 1 in this present embodiment
The protection circuit 1 that example one provides is conceived based on identical utility model, and and will not be described here in detail.
Structure design through this embodiment, the blender 2 of the utility model can be used for needing to carry out current of electric
The stirring of protection reduces security risk in electronic kitchen tools.The technical solution of the application can also be extended to other and need electric current
The household electrical appliance of protection or other need in the electrical component of current protection, improve the economic and practical and safe of household electrical appliance
Property.And 2 structure of blender of the utility model is simple, is easily assembled, and can reach under lower price and less device
Identical function improves the competitiveness of product.
The protection circuit and blender of a kind of circuit protection field are provided in the utility model embodiment；By in overcurrent
Connected on the output end of detection circuit holding circuit hardware controls cut off the power circuit conducting releasing contact to cutting off main electricity
Road electric current, realization can cut off in time motor in motor rotation blockage and maintain the off state of motor, this protection circuit structure letter
It is single, it is easily assembled, cuts off motor when over current of motor can be reached under lower price and less device (lower cost)
And the function of off state is maintained, improve the competitiveness of Related product.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments, and
There are many other variations of the different aspect of the utility model as described above, for simplicity, they are not mentioned in details
For；Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should be managed
Solution: it can still modify to technical solution documented in foregoing embodiments, or to wherein regional development and technology feature
It is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and the utility model is respectively implemented
The range of technical solution in example.
Claims (10)
1. a kind of protection circuit characterized by comprising circuit of cutting off the power, over-current detection circuit, holding circuit and be provided with
The main circuit of motor；
The output end of the circuit of cutting off the power is connected to the anode of the motor, the control terminal connection of the circuit of cutting off the power
To the input terminal of the holding circuit, the input terminal of the over-current detection circuit is connected to the cathode of the motor, the overcurrent
The output end of detection circuit is connected to the control terminal of the holding circuit；
After the over-current detection circuit detects that the current of electric reaches threshold value, the holding circuit conducting is controlled, and control
The electric current of the main circuit described in circuitry cuts of cutting off the power, makes the motor stop working.
2. protection circuit according to claim 1, which is characterized in that the main circuit further include: power supply, the power supply are logical
The main circuit is crossed as motor power supply；
The input terminal of the circuit of cutting off the power is connected to the anode of the power supply, the output end of the over-current detection circuit and institute
The output end for stating holding circuit is connected to the cathode of the power supply.
3. protection circuit according to claim 2, which is characterized in that the main circuit further include: current sampling resistor and
Insure resistance；
The current sampling resistor is connected between the cathode of the motor and the cathode of the power supply, the insurance resistance series connection
Between the anode of the positive and described motor of the power supply.
4. protection circuit according to claim 2, which is characterized in that further include: it is connected in parallel on the positive pole and described
The rectification circuit at power cathode both ends.
5. protection circuit according to claim 4, which is characterized in that the rectification circuit includes: dead resistance, the one or two
Pole pipe and commutation capacitor；
Described dead resistance one end is connected to the anode of the power supply, and the other end is connected to the anode of the first diode, institute
The cathode for stating first diode is connected to the anode of the commutation capacitor, and the cathode of the commutation capacitor is connected to the power supply
Cathode.
6. protection circuit according to claim 2, which is characterized in that
The circuit of cutting off the power includes: relay and the second diode, and second diodes in parallel is in the relay
Control terminal, the relay are connected between the anode of positive and described motor of the power supply.
7. protection circuit according to claim 3, which is characterized in that
The over-current detection circuit includes: the current sampling resistor, third diode, adjustable resistance, divider resistance and second
Capacitor；
The anode of the third diode is connected to the input terminal of the current sampling resistor, and the cathode of the third diode connects
It is connected to the input terminal of the adjustable resistance, the output end of the adjustable resistance is connected to the input terminal of the divider resistance, described
The output end of divider resistance is connected to the output end of the current sampling resistor, and second capacitor is connected in parallel on the divider resistance
Both ends.
8. protection circuit according to claim 7, which is characterized in that
The input terminal of the output end of the adjustable resistance and the divider resistance is additionally coupled to the control terminal of the holding circuit, leads to
It crosses and controls the resistance value size of the adjustable resistance to control the trigger voltage of the holding circuit conducting.
9. according to the described in any item protection circuits of claim 2-8, which is characterized in that
The holding circuit includes: thyristor, and the gate pole of the thyristor is connected to the output end of the over-current detection circuit, institute
The anode for stating thyristor is connected to the control terminal of the circuit of cutting off the power, and the cathode of the thyristor is connected to the power supply
Cathode.
10. a kind of blender characterized by comprising the described in any item protection circuits of the claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920058898.6U CN209571815U (en) | 2019-01-14 | 2019-01-14 | A kind of protection circuit and blender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920058898.6U CN209571815U (en) | 2019-01-14 | 2019-01-14 | A kind of protection circuit and blender |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209571815U true CN209571815U (en) | 2019-11-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920058898.6U Active CN209571815U (en) | 2019-01-14 | 2019-01-14 | A kind of protection circuit and blender |
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| Country | Link |
|---|---|
| CN (1) | CN209571815U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109599839A (en) * | 2019-01-14 | 2019-04-09 | 深圳和而泰智能控制股份有限公司 | A kind of protection circuit and blender |
-
2019
- 2019-01-14 CN CN201920058898.6U patent/CN209571815U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109599839A (en) * | 2019-01-14 | 2019-04-09 | 深圳和而泰智能控制股份有限公司 | A kind of protection circuit and blender |
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